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VOCAL Technologies > VOCAL Technologies Sitemap
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  • VoIP
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  • Audio
    • Voice Processing
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    • VoIP Vocoders
    • Voice and Video over IP (V2oIP) Software
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VOCAL Technologies > VOCAL Technologies Sitemap

VOCAL Technologies Sitemap

  • 1800# Toll Free Data Service SIP Analog Modem Server (SAMS) Supported Back End
  • 5G
    • Adaptive beamforming via covariance matrix reconstruction
    • Adaptive beamforming via steering vector estimation
    • Compressive sampling array
    • DOFs enhancement using sparse array
    • Knowledge enhanced compressive radar imaging
    • Knowledge enhanced compressive radar ranging
    • Knowledge enhanced compressive sampling array
    • Pilot Design in FDD massive MIMO
    • Radar-communication spectrum sharing
    • Source localization
    • Transmit beamforming and beamtracking
  • A and C Weighting via Bilinear Transform and Warping Mitigation
  • Automatic Gain Control
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  • Defense & Aerospace
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  • About VOCAL Technologies
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  • Acronyms and Abbreviations
  • Analog Telephone Adapter (ATA) Reference Design
    • ATA Reference Design Applications
    • VPBX Home Gateway Design
    • ATA 2x1x1 Development Board
    • ATA 2×2+1 Development Board
    • ATA 1x1x1 Development Board
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    • ATA Design Features
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    • ATA Reference Design Components
    • ATA Provisioning
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    • VPBX Home Gateway Reference Design
    • Home PBX Extension Device
    • VPBX Home Gateway Design Features
    • VPBX Home Gateway Design Specifications
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  • Audio Examples
    • Echo Cancellation Audio Examples
    • GSM Speech Coder Audio Examples
    • ITU Speech Coder Audio Examples
    • Noise Cancellation Audio Examples
    • Noise Cancellation Audio Examples
    • Other Speech Coder Audio Examples
    • Speech Coder Audio Examples
    • Wideband Speech Coder Audio Examples
  • Beamforming
    • Acoustic Beamformer
    • Acoustic Beamformer Design
    • Acoustic Beamforming Algorithms
    • Acoustic Beamforming with Microphone Array
    • Acoustic echo cancellation with the LMS algorithm
    • Acoustic echo cancellation with the ML algorithm
    • Acoustic echo cancellation with the NLMS algorithm
    • Acoustic Multiple-Channel Crosstalk Canceller
    • Acoustic source localization using circular array microphones
    • Acoustic Two-Channel Crosstalk Canceller
    • Adaptive Beam Steering
    • Adaptive Beamformer with Poles and Zeros
    • Adaptive Beamforming using MUSIC Pseudo-Spectrum
    • Adaptive Null Steering
    • Baseband Frequency Locking for Distributed Transmit Beamforming
    • Beamforming Techniques
    • Beamforming white noise gain
    • Beamsteering in Broadband Beamformers
    • Blind source separation using DUET-like algorithm
    • Broadband Constrained Minimum Variance Beamformer
    • Broadband Multiple Linear Point Constraint Design
    • BSS for a single desired speech source
    • BSS for an under-determined system
    • BSS performance measures
    • Centered circular array direction of arrival estimation using least squares
    • Circular Microphone Array
    • Coherence based interference cancellation through region of arrival
    • Compressed sensing approach to blind source separation of far field sources
    • Consensus Based Synchronization For Distributed Transmit Beamforming
    • Constant Beamwidth Frequency Domain Broadband Beamformer
    • Differential Microphone Arrays
    • Differential nullforming with uniform circular array
    • Direction of arrival using uniform circular array microphones
    • Directional beamforming using two microphones
    • Directional Of Arrival Estimation In Beamforming
    • Distributed Transmit Beamforming
    • Double-talk detection based on orthogonality principle
    • Effective filter for circular array microphones
    • Effective filter for diamond array microphones
    • Effects of separation distance on endfire microphone array beamforming
    • Efficient distortionless response for conferencing
    • Endfire microphone array beamforming
    • Endfire microphone array beamforming with small beamwidth
    • Energy based algorithm for cross-talk detection
    • ESPRIT Algorithm- The Son of MUSIC
    • Exact, elegant coherence based sub-band angle of arrival estimation for broadband acoustic signals
    • Far Field Direction Of Arrival Estimation
    • Far field direction of sound source estimate using circular array microphones
    • Far-field Sound Pickup and Beamforming
    • Fast And Efficient GCC Algorithm For Speech Angle Of Arrival Detection
    • Fast beamformer with fixed direction for circular array microphones
    • Fast beamforming with four microphones for ASR engines
    • Fast, efficient and finite set SRP-PHAT angle of arrival estimation for beamforming
    • Fault detection in microphone arrays for speech enhancement
    • First order adaptive differential microphone array beamforming
    • First order differential microphone array beamforming
    • First order endfire beamformer directional noise SNR improvements
    • First order endfire beamformer uncorrelated noise SNR improvements
    • Frequency Domain Beamforming
    • Frost Beamformer
    • Full circle direction of arrival estimation for RTOS using least squares
    • Full plane least squares acoustic sound source localization
    • Fundamental Limits On Angle Of Arrival Estimation Error For Acoustic Microphone Array
    • Generalized Sidelobe Canceler (GSC)
    • Griffiths-Jim Beamformer for Noise Reduction
    • Gunshot detection and localization
    • Half plane least squares acoustic sound source localization
    • High resolution far field direction of arrival using three microphones
    • How can beamforming create power?
    • Implementation Issues with Subspace Based Estimation Algorithms
    • Implementing MUSIC Algorithm
    • Linear Array Beamforming
    • Linear Constrained Minimum Variance (LCMV) Beamforming
    • Link Quality Indicators for Detection of Interfering Signals
    • LMS implementation of first order adaptive differential microphone array beamforming
    • Microphone Array Beamforming
    • Microphone Array Beamforming
    • Microphone Array Technologies
    • Minimum Variance Distortionless Response (MVDR) Beamformer
    • Minimum Variance Distortionless Response Beamformer Software
    • Minimum Variance Distortionless Response(MVDR) Beamforming
    • Mixing matrix estimation for blind source separation of far field sources
    • Multi Mic Audio Signal Processing
    • MUSIC (Multiple Signal Classification) Algorithm
    • MVDR based two microphone beamforming with given desired signal direction
    • Near Field Acoustic Beamforming
    • Near Field Adaptive Beamforming
    • Near field direction of sound source estimate using circular array microphones
    • Non-aliased TDOA angle of arrival estimation
    • Non-uniform Sampling with Microphone Array
    • Nth order endfire beamformer
    • Null-formed Beamforming for Improved Echo Return Loss
    • Out of band energy level based algorithm for cross-talk detection
    • Robust fixed point beamforming
    • Root-MUSIC based sub-band angle of arrival estimation for broadband acoustic signals
    • Scalable Distributed Transmit Nullforming
    • Scalable Joint Distributed Transmit Beamforming And Nullforming
    • Second order adaptive differential microphone array beamforming
    • Second order differential linear microphone array beamforming
    • Second order differential non-linear microphone array beamforming
    • Second order uniform circular array directional beamforming
    • Sensitivity of ULA direction of arrival estimates using GCC like algorithms
    • Signal to noise ratio estimation with two microphones
    • Single directionless filter for circular array sum and filter beamformer
    • Single microphone speech enhancement based on apriori signal to noise ratio
    • Small beamwidth endfire beamforming
    • Sound Source Localization
    • source to distortion ratio as a measure of BSS performance
    • Spectral subtraction of acoustic noise
    • Statistical optimal beamformers with steering vector mismatch
    • Statistical optimal beamformers: generalized sidelobe canceler
    • Statistical optimal beamformers: linearly constrained minimum variance beamformer
    • Statistical optimal beamformers: Multiple sidelobe canceller
    • Statistical optimal beamformers: reference signal beamformer
    • Super directive beamforming with two microphones
    • Two microphone beamforming for hearing aids
    • Two microphone endfire beamformer signal to noise plus interferer improvements
    • Two microphone source separation with spatial prior
    • ULA directional noise SNR improvements with delay and sum beamformer
    • ULA signal to noise plus interference ratio improvements with delay and sum beamformer
    • ULA uncorrelated noise SNR improvements with delay and sum beamformer
    • Uniform circular array directional noise SNR improvements with delay and sum beamformer
    • Uniform circular array uncorrelated noise SNR improvements with delay and sum beamformer
    • Variable descent step size for AEC
    •  Far field monitoring with microphone arrays 
    • Acoustic Beamforming Software
    • Beamforming for Low Probability of Intercept
    • Sound Propagation Models for Beamforming
    • Beamforming Algorithms for Ultrasonic Imaging
    • User Selection for Multiple Antenna Broadcast Channel
    • Beamforming combined with AEC and Noise Suppression
    • Wireless Beamforming Techniques
    • Beamforming in Wireless Sensor Networks
    • Exploiting Spacial Diversity in Single Antenna Systems using Cooperative Communications
  • Blind Signal Separation (BSS)
    • Blind Source Separation
    • Blind Source Separation for Noise Reduction in Mobile
    • Blind Source Separation: High Order Statistics Approach
    • Correlation Techniques
    • Data Modeling
    • Deep Learning Based Voice-Activity-Detection (DLVAD)
    • Generation of Mixing Functions for BSS and Beamforming
    • Hearing: Cocktail Party Problem
    • ICA: Independent Component Analysis
    • Maximum-Likelihood (ML) Algorithm
    • PCA: Principal Component Analysis
    • Speech Separation with Microphone Arrays
    • Time Delay Estimation
    • Undetermined Blind Signal Separation
  • Block Diagrams
  • Compressed Sensing
    • Recovery of Audio Signals with Compressed Sensing
    • Adaptive Parity Error Detection for Compressive Imaging
    • Background Subtraction using Compressed Sensing
    • Interference Cancellation in Compressed Sensed Signals
    • Overview of Encryption of Compressed Sensed Images
    • Terahertz Imaging for Security using Compressed Sensing
    • Enhanced Security Based on Under-Determination in Compressed Sensing
    • Error Correction Using Compressed Sensing Techniques
    • Gradient Projection Reconstruction of Compressed Sensing Signals
    • Compressed Sensing of Images
    • Compressed Sensing in Secure JPEG2000 (JPSEC)
    • Compressed Sensing for Error Protection in JPWL
    • Multipath Channel Estimation with Compressed Sensing
    • Noise Resiliency with Compressed Sensing
    • Secrecy of Cryptography With Compressed Sensing (CS)
    • Single Pixel Camera
  • Contact Us
    • Acoustic Beamforming Solutions
    • Ask the Experts
    • Echo Cancellation Software Solutions
    • Lawful Interception Solutions
    • Noise Reduction Solutions
    • Request Brochure
    • Request Demo
    • Video Solutions
  • Cryptography
    • Public Key and Secret Key Cryptography
    • Steganography
    • Advanced Encryption Standard (AES)
    • Camellia
    • CAST-128 and CAST-256
    • CCM
    • Data Encryption Standard (DES)
    • DSA – Digital Signature Algorithm
    • ECDSA – Elliptic Curve Digital Signature Algorithm
    • Encryption
    • GCM and GMAC authenticated encryption algorithms
    • HMAC
    • Keywrap algorithms – AESKW, AKW1, AKW2, TDKW
    • Rabin Digital Signature Algorithm
    • RC4 Encryption Algorithm
    • RIPEMD
    • RSA
    • RSA User Authentication
    • RSA Key Size Selection
    • Theory of RSA
    • SEED
    • SHA-1 and SHA-2 (SHA-224, SHA-256, SHA-384, SHA-512) Hashing Algorithm
    • Triple Data Encryption Standard (Triple-DES)
    • Whirlpool
  • Data Modem
    • 56K Modem Software
    • Data Modulation Software
    • Data Protocol Software
    • Command Set Controller Software
    • V.22bis / V.22 / Bell 212 / V.23 / V.21 / Bell 103 Modem Software
    • V.32bis and V.32 Modem Software
    • V.34 Modem Software
    • V.42 / V.42bis Software
    • V.44 Data Compression Software
    • V.90 Modem Software
    • V.91 Modem Software
    • V.92 Modem Software
    • V.92 Modem-on-Hold, PCM upstream and Quick Connect Features
  • Datasheets
  • Dereverberation
    • Comb Filtering in Acoustics
    • Controlling RT60 – Practical Notes
    • Critical Distance
    • Critical Distance and RT60
    • Early Reflections
    • Frequency domain single channel blind dereverberation
    • Information theoretic approach to single channel dereverberation
    • Methods of RT60 Estimation
    • Minimum Phase LTI Systems in Context of Equalization
    • Practice of RT60 Estimation in Bands
    • Room Reflections
    • Speech Dereverberation using Channel Inversion and Equalization
    • Various Models of Room Reverberation
    • Voice Activity Detection for Dereverberation
    • Speech Reverberation
    • Room Impulse Response
    • Dereverberation and Adaptive Beamforming
    • Dereverberation using Spectral Subtraction
    • Reverberation Cancellation Versus Suppression
    • Octave Banks for Acoustic Filtering
  • Echo Cancellation
    • A and C Weighting via Bilinear Transform
    • Acoustic Echo Cancellation (AEC) Barge-In
    • Acoustic Echo Cancellation (AEC) for Sparse Echo Paths
    • Acoustic Echo Cancellation for Wireless Devices
    • Acoustic Echo Canceller
    • Acoustic Echo Paths Characteristics and AEC
    • Acoustic Echoes in Mobile
    • Acoustic Feedback
    • Acoustic Feedback Cancellation and Suppression
    • Adaptive Acoustic Echo Cancellation
    • Adaptive Filter Algorithm Stability
    • Adaptive Impulse Response Estimation Algorithms
    • AEC and NR Combined using Single Channel Data
    • Aligning Audio Streams Captured using Unsynchronized Clocks
    • Comfort Noise Generation in Echo Cancellers
    • Convergence Speed Optimization for Normalized Least Mean Square (NLMS) Algorithm
    • Critically Sampled Uniform Sub-Band Echo Cancellation using LMS-type Algorithms
    • Delay Tracking for Voice over Packet Switched Network
    • Digital Network Echo Canceller Software
    • Double Talk Detection Using Cross Correlation
    • Double Talk Detection Using Speech Features
    • Double-Talk Detection in Echo Cancellation
    • Dynamic Time Warping
    • Echo Cancellation based on Adaptive IIR Filtering
    • Echo in Voice over IP Networks
    • Echo Path Delay Identification Offline
    • Echo Paths for Hands-Free Terminals
    • Efficient Fullband and Wideband AEC Implementations
    • Energy and Level Estimation for G.168 Testing
    • Equalization For ETSI-Compliant Audio Facility
    • Estimating ERL from AF FIR Taps
    • ETSI Audio Room Equalization – Selected Details
    • Far-end Echo Delay Estimation with the Presence of Near-end Echo
    • Far-End Line Echo Canceller
    • Feedback Mitigation – Frequency Suppression
    • Feedback Mitigation – Phase Modulation
    • FIR Filter Design
    • Fixed Point Mathematics for Acoustic Echo Cancellation
    • Frequency domain acoustic echo cancellation
    • G.167 Acoustic Echo Canceller
    • G.168 Defined Echo Path Models
    • G.168 Test Methodology
    • Gammachirp Filter for Acoustic Echo Cancellation (AEC)
    • Haar Wavelet Decomposition in Acoustic Echo Cancellation (AEC)
    • Hidden Markov Models for Acoustic Echo Cancellation (AEC)
    • High-Pass Filters in Echo Cancellers
    • Impulse Response Estimation for Audio via Complementary Sequences
    • In-Car Communication (ICC): Delay-Critical Applications
    • Kalman Filter in Acoustic Echo Cancellation (AEC)
    • Level Measurements via ITU P56 and Weighting
    • Line & Acoustic Echo Canceller Combined
    • Line / Network Echo Canceller
    • Line and Acoustic Echo Diagnostics
    • Line Echo Canceller with Backup FIR Filter
    • Line Echo Canceller with Bulk Delay Compensation
    • Linear Phase Filters in Acoustic Echo Cancellation
    • Multi-Channel Acoustic Feedback/Echo Cancellation
    • Multi-Channel Acoustic Feedback/Echo Cancellation
    • Network Delays and Line / Network Echo Canceller Provisioning
    • Non-Linear AEC
    • Non-Linear Processing in Echo Cancellation
    • Nonlinear Acoustic Echo Cancellation
    • Potential Instability of NE/FE System with Echo Cancellation
    • Potential Instability of NE/FE System without Echo Cancellation
    • Proportionate Normalized Least Mean Squares Adaptation
    • Psychoacoustic Echo Cancellation
    • Residual echo suppression
    • Signal De-Correlation
    • Sparse Echo Cancellers
    • Spatial Sampling and Aliasing with Microphone Array
    • Stability Control by Echo Canceller
    • Stereo Acoustic Echo Canceller (AEC)
    • Stereo and Surround Sound Acoustic Feedback/Echo Cancellation
    • Stereo and Surround Sound Acoustic Feedback/Echo Cancellation
    • Stereophonic Acoustic Echo Cancellation
    • Sub-Band Acoustic Echo Cancellation
    • Tandem Echo Cancellers
    • The Multi-channel Acoustic Echo Cancellation Problem
    • Tonal Input Suppression Problem
    • Tone Detectors in Echo Cancellers
    • Two microphone adaptive nullforming for vehicle environment
    • Two microphone auditory sub band adaptive nullforming
    • Variable Tap Length Filters for Acoustic Echo Cancellation (AEC)
    • Viterbi Algorithm in Speech Enhancement and HMM
    • VoIP Echo Cancellation
    • VoIP Echo Cancellation Software
    • Volterra AEC
    • Zero-Delay Feedback and Echo Cancellation
    • Requirements for Acoustic Echo Cancellation and Noise Reduction
    • The Combination of Adaptive Filters
    • Acoustic Echo Cancellation (AEC) Software
    • Two-Path Method for Acoustic Echo Cancellation
    • Robust Adaptive Algorithms for Echo Cancellation
    • Anti-howling
    • Echo Cancellation in Cellular Networks
    • Echo Control on Codec Parameters
    • The Combined Reduction of Echo and Noise
    • Acoustic Echo Cancellation (AEC) for Commercial Off-the-Shelf (COTS) Hardware
    • The Affect of Convergence Speed in the Two-Path Method
    • Cross-Correlations in Echo Cancellation
    • Double-Talk Detection (DTD)
    • Estimating Echo Return Loss and Echo Return Loss Enhancement
    • Frequency Domain Adaptive Filtering in Echo Cancellation
    • Frequency Offset Compensation in Echo Cancellation
    • G.165 Echo Canceller Software
    • G.168 Line Echo Canceller Software
    • Handling of Nonlinearities in Echo Cancellation
    • Echo Cancellation in IP Networks
    • Multichannel Acoustic Echo Cancellation
    • Non-conventional Applications of Acoustic Echo Cancellation (AEC)
    • The Perception of Echo
    • Post Filtering for Residual Echo Control
    • Statistical Joint Control of Acoustic Echo Canceller and Post-Filter
    • Subband Adaptive Filtering
    • Variable Step-size and Regularization Parameters for NLMS
    • Wideband Acoustic Echo Cancellation
  • Engineering Services
    • Custom Echo Cancellation Solutions
  • Forward Error Correction Algorithms
    • BCH Error Correcting Codes
    • Reed Solomon Implementation
    • Reed Solomon Software Performance
    • Reed Solomon (RS) Algorithm Overview
  • Fax Modem
    • Fax Demodulator and Fax Decoder
    • Fax Monitoring and Diagnostics
    • Fax Command Set Software
    • Fax Modulation
    • Fax Protocol Software
    • T.30 Fax Software
    • T.30-E Color Fax Software
    • V.17 Fax Software
    • V.21 Channel 2 Fax Software
    • V.27ter Fax Software
    • V.29 Fax Software
    • V.34 Fax Software
    • Secure Faxing with JPSEC
    • Fax Monitoring and Recording
  • Hardware Reference Designs
    • Advanced Encryption Standard (AES) IP Core
    • Counter with Cipher Block Chaining-Message Authentication Code (CCM) IP Core
    • FPGA/PLD/ASIC Cores
  • Lawful Interception
    • Lawful Interception of VoIP Communications at an ISP
    • Video and Voice over IP (VoIP) Decoding
  • Networking
    • IEEE 802.11
    • IEEE 802.11e
    • IEEE 802.11n
    • 802.11 Authentication and Association
    • 802.11 Distributed Coordination Function (DCF)
    • Distortion Based Networking – Ad Hoc Wireless Routing
    • Distortion Minimizing Rate Control for Wireless Multimedia Sensor Networks
    • Datagram Transport Layer Security (DTLS)
    • Dynamic Directional RTS/CTS
    • ICE: Interactive Connectivity Establishment
    • Internet Protocol Security (IPsec)
    • IPsec for uClinux
    • LANsEND Network Operating System
    • Medium Access Control for Distortion Based Networking
    • Multicast and Unicast Streaming Media
    • TR-098
    • Nat/Firewall Software
    • TCP TURN
    • Transport Layer Security (TLS) and Secure Socket Layer (SSL)
    • Classic STUN: Simple Traversal of UDP Through NAT
    • STUN Server in ICE Context
    • TURN: Traversal Using Relay NAT Software
    • Network Utility Maximization (NUM) for Resource Allocation
    • Wireless Transport Layer Security (WTLS) Software
  • Noise Reduction
    • A Basic Voice-Activity-Detection (VAD)
    • Active Noise Control
    • Adaptive Noise Reduction
    • Advanced Noise Reduction via HMM
    • Forensic Speaker Recognition Preprocessor
    • Iterative Spectrum Subtraction Noise Reduction
    • Keyboard Click Removal
    • Microphone Noise Reduction
    • More on Observations Regarding Musical Noise
    • Musical Noise in Acoustic Noise Reduction
    • Noise Estimation: Dynamics v. Stationarity
    • Noise Reduction Solutions
    • Noise Reduction via Hidden Markov Model (HMM)
    • Noise Reduction via Speech Modeling
    • Noise Reduction: An Instructional Example
    • Perceptual Noise Reduction for Voice Quality Enhancement
    • Perceptual-Based Spectrum Subtraction Noise Reduction
    • Real-Time Audio Filtering
    • Single Channel Wind Noise Detection
    • Sound Isolation for Noise Control in Communications
    • Statistical Analysis of Random Signals
    • Synthetic Noise for Voice Enhancement
    • Synthetic Noise of Predefined Spectrum for Voice Enhancement
    • The FFT: An Efficient Class of Algorithms
    • The Simple Theory of Noise Reduction: Wiener Filtering
    • Unifying Spectrum Subtraction with Wiener Filtering
    • Using Noise Modeling for Speech Enhancement
    • Using Statistical Models for Speech Enhancement
    • Voice-Activity-Detection (VAD) Feature Set
    • Wind Noise in Mobile Telecommunication
    • Noise Reduction Using Minimum Mean Square Estimators (MMSE)
    • Model-Based Speech Enhancement
    • Monaural Speech Separation
    • Noise Reduction of Non-stationary Noise Sources
    • Single microphone active noise cancellation
    • Single microphone active noise cancellation
    • Two microphone active noise cancellation
    • Voice activity detector in highly degraded environments
    • Psychoacoustic Noise Suppression
    • The Artifacts of Spectral Subtraction
  • Particle Swarm Optimization
    • Image Compression using Compressed Sensing (CS) and Particle Swarm Optimization (PSO)
    • Motion Tracking using Particle Swarm Optimization
    • Particle Swarm Optimization in the RWA Process for All-Optical WDM Networks
    • Particle Swarm Optimization in Signal Separation
    • Particle Swarm Optimization (PSO) in Speech Enhancement
    • Adapting Particle Swarm Optimization (PSO) by Deciding on the State of Convergence
    • Adaptive Particle Swarm Optimization (APSO)
    • Time Delay of Arrival (TDOA) using Particle Swarm Optimization (PSO)
    • Noise Reduction using SVD and PSO
    • Particle Swarm Optimization in the Design of Adaptive FIR Filters
    • Particle Swarm Optimization in the Design of Adaptive IIR Filters
    • Particle Swarm Optimization in Acoustic Echo Cancellation (AEC)
    • Adaptive Antenna Arrays using Particle Swarm Optimization
    • Blind Signal Separation (BSS) using Particle Swarm Optimization (PSO)
    • Particle Swarm Optimization on FPGA
    • Gaussian Particle Swarm Optimization (GPSO)
    • Particle Swarm Optimization in the Grassmannian Line Packing Problem for MIMO Beamforming
    • Euclidean Particle Swarm Optimization (EPSO)
  • Perceptual Filtering
    • Discrete Wavelet Transform in Speech Enhancement
    • Perceptual Linear Prediction Cepstral Coefficients in Speech
    • Phase Reconstruction
    • Pitch Detection using Cepstral Method
    • Time Scale Modification
    • Wavelet Transform in Speech Enhancement
  • Press Releases
    • Acoustic Echo Cancellation Plus Integrates Speech Enhancement, AGC and Echo Tail Search
    • Dereverberation Brings the Far-End Speaker Up Close and Clear
    • Enhanced TR-069 VoIP Stack Enables Dynamic Reconfiguration of Fax Lawful Interception Assets
    • Enhanced VoIP Stack Design with Echo Cancellation for Crisp Clear Speech
    • HD Video Reference Design Lowers Cost of Multi-Channel H.264 1080p Videoconferencing
    • Teletics MoNet MoIP Gateway Implements VOCAL’s Enhanced Modem over IP Solution
    • VOCAL and Tilgin Partner to Leverage TR-069 for Enhanced Customer Services
    • VOCAL Announces HD Video MCU Reference Design for Multi-Channel HD Video Conferencing Solutions
    • VOCAL’s Comprehensive Fax Diagnostics Troubleshoot Fax Transmission Issues
    • VOCAL’s VoIP Software Stack Includes Android Optimized ITU, GSM and Wideband Vocoders
    • VOCAL’s Multi-Channel Video Framework Unleashes Full Potential of DaVinci DM8168
    • VOCAL Software Translates Video For 2.5G/3G Wireless Handsets
    • VOCAL Software Enables WLAN Hardware Implementation
    • VOCAL Technologies Unveils RAS Over IP™ Technology
    • VOCAL Adds DSP Functionality to MIPS Technologies’ New 32-Bit Pro Series™ Cores
    • VOCAL Turbo Codes Boost IEEE 802.11a, 802.11b and 802.11g Wireless LAN Performance
    • VOCAL LDPC Codes Extend IEEE 802.11a, 802.11b and 802.11g Wireless LAN Range
    • VOCAL quadruples battery life in IEEE 802.11a, 802.11b, and 802.11g Wireless LAN mobile units
    • VOCAL Technologies Inks Accord With Agilent Technologies
    • VOCAL offers build-to-suit IEEE 802.11a, 802.11b, and 802.11g Wireless LAN Solutions
    • VOCAL Provides the Voice for Sorenson SVX Hybrid Chips
    • VOCAL Technologies Provides Turnkey DSP Software Solution To InSciTek’s Allworx 10x Server
    • New Adapters from VOCAL Technologies, Ltd. enhance VOIP service, accommodate more phones
    • VOCAL Adds DSP Functionality to MIPS Technologies’ New 32-Bit Pro Series™ Cores
    • VOCAL Introduces Optimal CTR-AES, CBC-MAC-AES, and CCMP-AES Encryption Cores for 802.11i
    • VOCAL Provides Its AES-128 for DTCP Using Industry-Standard Microprocessors
    • VOCAL Technologies selects SMSC as its ethernet silicon supplier for all ip interaction serving voice over IP market
    • VOCAL Announces Single-Processor VoIP-Analog Telephone Adapter Based on TMS320C55x DSP from Texas Instruments
    • New Internet PBX ATA (iPBX) and PBXtender Extends VoIP to Homes, Offices
    • VOCAL Technologies, Ltd. Teams with SOC Technology GmbH & Co. KG for Production of VoIP Speaker Phone
    • VOCAL Technologies Chooses Legerity VoicePort for Ultra Low Cost ATA
  • Resources
    • Reference Designs
      • Communication Security
      • Data Modem
      • Echo Cancellation
      • Fax
      • Lawful Interception
      • Radio
      • Video
      • Voice
      • VoIP
    • The Impending Removal of Digital Lines
    • Current Research
      • Communication Security
      • Echo Cancellation
        • Adaptive Interference Cancellation Software
      • Fax
      • Lawful Interception
      • Video
      • Voice
      • VoIP
    • Digital Signal Processing (DSP)
      • ARM Cortex M4 – Lightweight DSP Solution
    • DSP Developer Resources
    • DSP links
  • Secure Communication
    • Frequency Scrambler and Frequency Inversion
    • JPSEC Authentication Template
    • EAPoL – Extensible Authentication Protocol over LAN
    • JPSEC Decryption Template
    • CCMP
    • JPSEC Hash Template
    • JPSEC Key Information Template
    • JPSEC Registration Authority (RA)
    • JPSEC Tools
    • Cryptographic Message Syntax (CMS)
    • Document Signature by Multiple Parties
    • EAP – Extensible Authentication Protocol
    • SDES
    • EAP Types – Extensible Authentication Protocol Types information
    • JPSEC: Secure JPEG2000
    • Secure Application Configuration Access Protocol – ACAP over SSL/TLS
    • EAPoW – Extensible Authentication Protocol over Wireless
    • Secure Hypertext Transfer Protocol (S-HTTP)
    • HTTPS: HTTP over SSL/TLS
    • Wired Equivalent Privacy (WEP)
    • Internet Key Exchange version 2 (IKEv2) Protocol
    • Multimedia Internet Keying – MIKEY
    • Secure Internet Message Access Protocol – IMAP over SSL/TLS
    • Secure Simple Mail Transport Protocol – SMTP over SSL/TLS
    • Secure/Multipurpose Internet Mail Extensions & S/MIME Software
    • Wi-FI Protected Access (WPA)
  • Assured Services Session Initiation Protocol (AS-SIP)
  • Session Initiation Protocol SIP
    • SIP Agents
    • SIP Servers
    • SIP Sessions
    • SIP Trunking
    • SIP User Authentication
    • Session Initiation Protocol (SIP) and Deep Packet Inspection (DPI)
    • SIP Conferencing
    • SIP Call Forwarding
    • Locating SIP Servers
    • SIP Message Routing
    • SIP PRACK
    • SIP Instant Messaging
    • SIP Presence
    • SIP Registration
    • Secure SIP
    • SIP Session Timers
    • SIP Call Transferring
  • Software Modules
    • Basic Linear Algebra Subprograms
    • Communication Security Software
    • Data Modem Software
    • Echo Cancellation Software
    • Embedded Software Modules
    • Fax Modem Software
    • Lawful Interception Software
    • Radio Software
    • Video Software
    • Voice Software
    • VoIP Software
  • Specialty Technologies
    • Fax Lawful Interception Software
    • Custom Cryptographic System Design
    • T.38 Fax Image Decoding
  • Speech Compression and Speech Coder Software
    • Audio Sample Rate Converter
    • CVSD
    • Fractional Resampling
    • G.729 and Its Application in the Cellular Market
    • Opus Audio Codec Solutions
    • Vocoder Transcoding Software
    • ITU Speech Coders
    • GSM Speech Coders
    • Wideband Speech Coders
    • Other Speech Coders
    • Packet Loss Concealment (PLC) in Vocoders
    • PSQM, PSQM+ & Perceptual Scale
    • Speech Codecs and Associated PSQM Values
    • LPC-10 Codec
    • MELP Codec
    • How to Choose a Speech Coder?
    • MELP Modifications to LPC-10
    • MELPe Codec
    • TSVCIS MELPe
    • Stability of LPC Filters in Vocoders
    • Wideband Energy Detection in Scalable Speech Coding
    • Windowing in Vocoders to Remove Artifacts
    • 218x Resource Requirements
    • Allpass Filters in Vocoders
    • Arithmetic Coding in Vocoders
    • Efficient Implementation of LPC Analysis Filters
    • Comfort Noise Generation in Vocoders
    • Evaluating Speech Coders
    • G.711 Codec
    • G.722 Vocoder
    • G.722.2 Adaptive Multi-Rate Wideband (AMR-WB)
    • G.723.1 Codec
    • G.726 Codec
    • G.722.1 Codec
    • G.728 Codec
    • G.729 Codec
    • G.729A Codec
    • G.729.1 Codec
    • G.729AB Codec
    • GSM Adaptive Multi-Rate (AMR) Codec
    • GSM Enhanced Full Rate (EFR) Codec
    • GSM Half Rate (HR) Codec
    • GSM Full Rate (FR) Codec
    • iLBC (Internet Low Bitrate) Vocoder
    • Opus Codec
    • SILK Codec
    • Speex Codec
  • Speech Recognition
    • Automatic Speech Recognition and Speech Enhancement
    • Machine Learning Algorithms
    • Measuring Detector Performance in Voice Activity Detection
    • Microphone Array Aided Distant Speech Recognition
    • Room Quality Modeling
    • Speaker Diarization
    • Speech Composition for Recognition
  • Stochastic Resonance
    • Weak Signal Detection using Particle Swarm Optimization (PSO) and Stochastic Resonance (SR)
    • Stochastic Resonance of Binary Signals
    • Implementing Stochastic Resonance in Discrete Time
    • Stochastic Resonance of Analog and Digital Signals
  • System Designs
    • Analog over IP (AoIP) Gateway Reference Design
    • Analog Telephone Recorder Reference Design
    • DM8168 Video Software
    • HD Video Reference Design
    • Media Gateway Reference Design
    • Remote Access Server over IP™ (RASoIP™)
    • Remote Radio Monitoring
    • RoIP Gateway
    • Soft Radio Reference Design
    • Space Application Development Board
    • Space Application Development Board for Full Duplex Hands-Free Voice Communication Systems
    • TR-069 Reference Design
    • VoIP Gateway Reference Design
    • VoIP Radio Reference Design
    • VoIP Reference Design
    • Resource Requirements
    • DSP RISC and CISC Supported Platforms
    • Supported Operating Systems
  • Telephony Software
    • ISDN Software
    • Speakerphone
    • Digital Telephony
    • Analog Telephony
    • DS1 Low Speed Digital Carrier Systems
  • Video
    • AdaBoost Training Algorithm for Viola-Jones Object Detection
    • Adaptive Bitrate Streaming
    • Advanced Motion Adaptive Deinterlacer
    • Advanced Motion Adaptive Directional Deinterlacer
    • Analog TV Demodulation
    • Analog TV Modulation
    • Analog TV Standards
    • ATSC Digital Terrestrial TV Modulator
    • ATSC Digital Terrestrial TV Receiver
    • ATSC Digital Terrestrial TV Transmitter
    • Backend Video Processing
    • Basic Directional Video Scaler
    • Basic Motion Adaptive Deinterlacer
    • Basic Motion Detector For Motion Adaptive Deinterlacer
    • Basic Video Scaler
    • Basic Video Sharpening
    • Basic Video Sharpening with Controlled Granularity and Noise Coring
    • Blocking Artifact Reduction
    • Color Management
    • Combined Video Scaler and Sharpener
    • Correlation Noise in Wyner-Ziv Video Coding
    • DCT Transform Digital Watermarking
    • Deinterlacing
    • Digital Video Broadcasting for Cable Systems DVB-C
    • Digital Video Broadcasting for Satellite Systems DVB-S
    • Digital Video Broadcasting for Terrestrial Systems DVB-T
    • Digital Video Surveillance Security Cameras
    • Digital Watermarking
    • Digital Watermarking for H.264 Video Compression
    • Distributed Video Coding (DVC)
    • DVB-T Receiver
    • Dynamic Adaptive Streaming of Video over HTTP (MPEG-DASH)
    • Embedded Zerotree in Wavelet Image Compression
    • Equalizer for ATSC Digital Terrestrial TV Receiver
    • Estimation of Complex Signal Magnitude and Angle
    • Face Detection using Viola-Jones Algorithm
    • Flesh Tone Noise Reduction Correction
    • FM Audio Demodulator
    • H.264/AVC Interpolation in Interframe Prediction
    • H.264/AVC Syntax
    • H.264/AVC Transform
    • H.264/AVC Video Decoder
    • Hadamard Transform Digital Watermarking
    • Histogram of Oriented Gradients (HOG) for Object Detection
    • Human Detection and Tracking in Video Surveillance System
    • Implementation of FIR using Downsampling
    • Implementation of FIR with Steep Rolloff and High Level of Attenuation Stopband
    • Impulse Noise immunity for AGC
    • Impulse Noise in TV channels
    • Interactive Video Technology
    • Interframe Noise Reduction for Video
    • Local Direction Detector
    • Mobile Live Streaming
    • Mobile Video-on-Demand
    • Mosquito Noise Reduction
    • Narrow Passband Spectrum Filtering by Downsampling and Trivial Rotation
    • Noise Reduction using Combined Linear-Median Filter
    • Noise Reduction using Spatial Level Control Filter
    • OFDM Modulation
    • Overshoot for Video Sharpening
    • P2P Mesh-Based Live Video Streaming
    • P2P Multi-Tree Based Live Video Streaming
    • P2P Network
    • P2P on Demand Mesh-Based Live Video Streaming
    • P2P Single Tree Based Video Streaming
    • P2P Video on Demand
    • P2P Video Streaming
    • Pixel-Domain Wyner-Ziv Coding
    • Profiles and Levels in H.264/AVC
    • Progressive Download
    • QoE in 3GPP DASH
    • Quality of Experience (QoE) for Streaming Video
    • Remote Video Surveillance
    • RGB and CMYK Color Space Conversion
    • RGB and HSV/HSI/HSL Color Space Conversion
    • RGB and YUV Color Space Conversion
    • Ringing in Scaling
    • Scalable Video Compression based on Wavelets
    • Scalable Video Encoding
    • Scale Invariant Feature Transform (SIFT) for Object Detection
    • Security in P2P Video Streaming
    • Spatial Domain Digital Watermarking
    • Speed Capture in Video Surveillance
    • Surveillance Video Coding with Background Preprocessing
    • Transform-Domain Wyner-Ziv Coding
    • User Adaptive Video Streaming
    • Video Compression Technology
    • Video Conferencing Technology
    • Video description technology
    • Video Processing Architecture
    • Video Scaling
    • Video Sharpening with Controlled Granularity
    • Video Streaming Protocols RTP, RTCP and RTSP
    • Video Streaming Technology
    • Video Streaming to Mobile Devices
    • Video Surveillance for Biometrics
    • Video Surveillance Technology
    • Video Vertical and Horizontal Sharpening with Diagonal Sharpening Control
    • Wavelet Transform Digital Watermarking
  • Video Codecs
    • VP8 Video Codec
    • JPEG
    • ITU H.261
    • ITU H.264
    • ITU H.263
    • JPEG 2000
    • JPEG2000 Rate and Quality Scalability
    • JPEG2000 and H.264 for Video Surveillance
    • Wavelet Transform for Sparsity in JPEG2000
    • JPEG2000 Image Transmission using JPIP
    • Secure JPEG2000 (JPSEC) Images
    • Wireless JPEG2000 Transmission and Unequal Error Protection using JPWL
    • MJPEG
    • MPEG-2
    • MPEG-4
  • Voice Processing
  • Voice Quality Enhancement
    • Adaptive voice activity detection using time domain zero crossings
    • Amplitude modulation spectrum detection for speech
    • Autoregressive model for speech processing in frequency domain
    • Bandwidth Extension
    • Classification Model Assessment and Validation for Voice Activity Detection
    • Control Logic for Adaptive Noise Cancellation
    • Dual Microphone Adaptive Noise Reduction Software
    • Eigen space voice activity detector for multiple microphone array broadband acoustics
    • Feedback controller design for audio AGC
    • First order derivative to detect speech onset and offset
    • First order digital equalizers
    • Frame based maximum likelihood classification of speech and background noise
    • Frequency modulation detection for speech
    • Generalized solution to the minimum variance distortionless response of broadband audio
    • Hilbert Transform in Signal Processing
    • How to get reverberation out of a single microphone recording
    • Howling detection based on LMS algorithm
    • Low Latency Speech Enhancement In-Car Communication Systems
    • Maximum likelihood classification of speech and background noise
    • Maximum likelihood voice activity detector
    • Noise Cancellation Microphones
    • Noise Cancellation Microphones for Automatic Speech Recognition
    • Non-linear Loudspeaker Microphone Enclosure Compensation
    • Removing musical noise from denoised speech
    • Second order digital equalizers
    • Signal Detectors and Classifiers
    • Signal Restoration in Frequency Domain via Prediction
    • Speech Enhancement and Speech Intelligibility
    • Speech pitch detection using modified average magnitude difference functions
    • Speech pitch detection using the average magnitude difference function
    • Speech pitch detection using the magnitude average product function
    • Voice activity detection with adaptive thresholding
    • Voice activity detection with long term spectral divergence
    • Voice activity detection with spectral flux
    • Voice Activity Detectors and Their Applications
    • VoIP Stack Featuring Voice Quality Enhancement (VQE)
    • Yule-Walker Algorithm and Method Used in Voice Enhancement
    • Maintaining the Harmonic Structures for Speech Enhancement
    • Voice Activity Detection (VAD) Software
    • Battlefield VOX Software
    • The Cause of Echoes in Coding
    • Dual Channel Noise Estimation for Speech Enhancement
    • Echo Reduction in Coding
    • Error Concealment for Speech Transmission
    • Measuring Speech Quality
    • Standard Methods of VAD
    • Speech Enhancement Software
    • Speech Enhancement Utilizing a Bone Conduction Microphone
  • VoIP
    • Analog Modem Adapter
    • Codecs Used in Voice over IP Technologies
    • Jitter Buffer for Voice over IP
    • Mobile Voice over IP Technology
    • Mobile Voice over IP Technology using H.323
    • Mobile Voice over IP Technology using SIP
    • Packet Loss Concealment
    • Point of Sale Modem Support on VoIP Networks
    • SIP Analog Modem Server (SAMS)
    • SIP Analog Modem Server – Alarm Panels
    • SIP Analog Modem Server – Modem as a Service (SAMS-MAAS)
    • SIP Analog Modem Server for Facsimile (SAMS-F)
    • SIP Analog Modem Solutions
    • SIP Software Modem
    • Transparent Data Modem Relay for Legacy Applications
    • UAV VoIP Gateway
    • V.150.1 Gateway
    • V.151 Gateway
    • V.152 Gateway
    • Voice over IP Adapters (ATA)
    • Voice over IP Packet Structure
    • VoIP Technology
    • MVoIP and Mobile VoIP Software
    • Android VoIP SDK
    • iOS VoIP SDK
    • MGCP Communications Protocol
    • Real-Time Transport Protocol (RTP)
    • SDP
    • Modem over IP
    • Radio over IP (RoIP)
      • ED-137 VoIP Air Traffic Management
      • ED-137 VoIP Air Traffic Management
    • Secure Real-time Transport Protocol (SRTP)
    • Fax over IP (FoIP)
    • T.38 Fax over IP
    • T.38 Transmission Over SRTP
    • T.38 Image Extraction from Captured Network Data
    • Current Proposed Modifications to T.38
    • T.38 Prioritization in a Universal Gateway
    • Comparison of T.38 Transmission Over UDPTL or RTP
    • Comparison of Facsimile Transmission over T.38 and V.152
    • VoIP Vocoders
  • Voice and Video over IP (V2oIP) Software
    • Real-Time Streaming Protocol (RTSP)
    • V2oIP Suite
    • V2oIP Module
  • WebRTC
    • Establishing a WebRTC Media Session
    • WebRTC and Complete Call Security
    • WebRTC and VOIP Compatibility
    • WebRTC Communications Security
    • WebRTC Enabled VoIP Endpoints
    • WebRTC Gateways
    • WebSockets and SIP over WebSockets
  • White Papers
  • VOCAL Technologies Sitemap

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VOCAL Technologies, Ltd.
520 Lee Entrance, Suite 202
Buffalo, NY 14228
Phone: +1 716-688-4675
Fax: +1 716-639-0713
Email: sales@vocal.com

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VOCAL Technologies, Ltd.
520 Lee Entrance, Suite 202
Buffalo, NY 14228
Phone: +1 716-688-4675
Fax: +1 716-639-0713
Email: sales@vocal.com

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