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| Number | Title | Issue Date |
| 8032359 | Embedded silence and background noise compression There is provided a method for use by a speech encoder to encode an input speech signal. The method comprises receiving the input speech signal; determining whether the input speech signal includes an active speech signal or an inactive speech signal; low-pass filte... | 10/04/2011 |
| 7983906 | Adaptive voice mode extension for a voice activity detector There is provided a voice activity detection method for indicating an active voice mode and an inactive voice mode. The method comprises receiving a first portion of an input signal; determining that the first portion of the input signal includes an active voice sig... | 07/19/2011 |
| 7787597 | Automated tools for testing echo cancellers using natural speech excitations There are provided methods and systems for automated testing of echo cancellers using natural speech excitations and evaluating an echo canceller by transmitting a first signal to the echo canceller, wherein the first signal includes a first speech signal and a firs... | 08/31/2010 |
| 7711108 | Fast echo canceller reconvergence after TDM slips and echo level changes A method of adjusting an echo canceller comprises obtaining a first cross-correlation between a far-end signal and an error signal, wherein the error signal is generated by subtracting an output signal of an adaptive filter from a local-end signal; determining wheth... | 05/04/2010 |
| 7711107 | Perceptual masking of residual echo A method of masking a residual echo signal by an echo canceller is provided. The method comprises receiving a far-end signal, adjusting filter coefficients of an adaptive filter in response to the far-end signal, generating an echo model signal based on the far-end ... | 05/04/2010 |
| 7660712 | Speech gain quantization strategy A speech encoder that analyzes and classifies each frame of speech as being periodic-like speech or non-periodic like speech where the speech encoder performs a different gain quantization process depending if the speech is periodic or not. If the speech is periodic... | 02/09/2010 |
| 7613291 | Echo path change detection using dual sparse filtering There is provided a method for use by an echo canceller to detect an echo path change and adjust to the echo path change. The method comprises determining a first bulk delay using a SPARSE foreground adaptive filter; configuring the foreground adaptive filter to an ... | 11/03/2009 |
| 7558729 | Music detection for enhancing echo cancellation and speech coding A method of using music detection to enhance an operation of an echo canceller is provided, wherein the echo canceller includes an adaptive filter and a nonlinear processor. The method comprises receiving an input signal including an echo signal by the echo cancelle... | 07/07/2009 |
| 7539300 | Echo canceller with enhanced infinite and finite ERL detection There is provided a method of detecting an infinite echo return loss (ERL) in an echo cancellation system while in a finite ERL mode. The method comprises determining a running mean attenuation by the echo cancellation system, determining a ratio of an echo signal t... | 05/26/2009 |
| 7346502 | Adaptive noise state update for a voice activity detector There is provided a method of updating a noise state of a voice activity detector (VAD) for indicating an active voice mode and an inactive voice mode. The method comprises receiving an input signal having a plurality of frames, determining an elapsed time since the... | 03/18/2008 |
| 7260522 | Gain quantization for a CELP speech coder There is provided a speech encoding system that receives a speech signal. The speech encoding system comprises a frame processor for processing a frame of the speech signal, where the frame processor includes a pitch gain generator that derives unquantized pitch gai... | 08/21/2007 |
| 7231348 | Tone detection algorithm for a voice activity detector There is provided a voice activity detection method for indicating an active voice mode and an inactive voice mode. The method comprises receiving an input signal having a plurality of frames, determining whether each of the plurality of frames includes an active vo... | 06/12/2007 |
| 7191122 | Speech compression system and method The invention improves the encoding and decoding of speech by focusing the encoding on the perceptually important characteristics of speech. The system analyzes selected features of an input speech signal, and first performing a common frame based speech coding of a... | 03/13/2007 |
| 7146309 | Deriving seed values to generate excitation values in a speech coder There are provided methods and devices for generating excitation values for a speech signal. In one aspect, an example method comprises obtaining one or more characteristics of a first speech frame of the speech signal, deriving a first seed value based on the one o... | 12/05/2006 |
| 7120578 | Silence description coding for multi-rate speech codecs Speech coding systems include multi-rate speech codecs having an encoder and a decoder. Silence description coding for multi-rate speech coding systems that employ discontinued transmission is performed in either the encoder or the decoder of the multi-rate speech c... | 10/10/2006 |
| 6961698 | Multi-mode bitstream transmission protocol of encoded voice signals with embeded characteristics A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The bitstream comprises a type component and a gain component. The type component is representative of a type classi... | 11/01/2005 |
| 6959274 | Fixed rate speech compression system and method The invention improves the encoding and decoding of speech by focusing the encoding on the perceptually important characteristics of speech. The system analyzes selected features of an input speech signal, and first performing a common frame based speech coding of a... | 10/25/2005 |
| 6898566 | Using signal to noise ratio of a speech signal to adjust thresholds for extracting speech parameters for coding the speech signal There are provided speech coding methods and systems for estimating a plurality of speech parameters of a speech signal for coding the speech signal using one of a plurality of speech coding algorithms, the plurality of speech parameters includes pitch information, ... | 05/24/2005 |
| 6823303 | Speech encoder using voice activity detection in coding noise A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding modes, an accurate representation of speech through CELP (code excited ... | 11/23/2004 |
| 6804203 | Double talk detector for echo cancellation in a speech communication system A speech communication system is provided that uses pitch information, pitch lags, pitch gains, energy and/or other speech characteristics about the outgoing speech and the unknown signal on a frame basis to determine if the unknown signal is an echo signal of the o... | 10/12/2004 |
| 6782360 | Gain quantization for a CELP speech coder A speech encoder that analyzes and classifies each frame of speech as being periodic-like speech or non-periodic like speech where the speech encoder performs a different gain quantization process depending if the speech is periodic or not. If the speech is periodic... | 08/24/2004 |
| 6757649 | Codebook tables for multi-rate encoding and decoding with pre-gain and delayed-gain quantization tables A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the bandwidth consumed by the bitstream by balancing the desired average bit... | 06/29/2004 |
| 6735567 | Encoding and decoding speech signals variably based on signal classification A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the bandwidth consumed by the bitstream by balancing the desired average bit... | 05/11/2004 |
| 6721712 | Conversion scheme for use between DTX and non-DTX speech coding systems In an exemplary conversion scheme, a frame of a first speech signal comprising a plurality of frames encoded at a plurality of first rates, including a first non-speech rate, is received. The rate of the received frame is determined, and if the received frame is enc... | 04/13/2004 |
| 6694293 | Speech coding system with a music classifier The invention provides a speech coding system with a music classifier. An encoder is disposed to receive an input signal and provides a bitstream based upon a speech coding of a portion of the input signal. The encoder provides a classification of the inp... | 02/17/2004 |
| 6636829 | Speech communication system and method for handling lost frames An exemplary decoder comprises a receiver that receives parameters of a speech signal on a frame-by-frame basis, a control logic for decoding parameters and for resynthesizing the speech signal, the control logic including a minimum spacing indicative of ... | 10/21/2003 |
| 6633841 | Voice activity detection speech coding to accommodate music signals An extended signal coding system that accommodates substantially music-like signals within a signal while maintaining a high perceptual quality in a reproduced signal during discontinued transmission (DTX) operation. The extended signal coding system cont... | 10/14/2003 |
| 6604070 | System of encoding and decoding speech signals A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the bandwidth consumed by the bitstream by balancing the desired ... | 08/05/2003 |
| 6581032 | Bitstream protocol for transmission of encoded voice signals A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the bandwidth consumed by the bitstream by balancing the desired ... | 06/17/2003 |
| 6574593 | Codebook tables for encoding and decoding A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the bandwidth consumed by the bitstream by balancing the desired ... | 06/03/2003 |
| 6463414 | Conference bridge processing of speech in a packet network environment There is provided a conference bridge or transcoder configured to intelligently handle multiple speech channels in the contest of a packet network, wherein various speech channels may adhere to variety of speech encoding standards. For example, the confer... | 10/08/2002 |
| 6397178 | Data organizational scheme for enhanced selection of gain parameters for speech coding A vector quantizer (VQ) table is arranged in increasing order with regard to a gc gain value (as may be represented by a prediction error energy En). The single stage VQ table is then organized into two-dimensional bins, with each bi... | 05/28/2002 |
| 6275794 | System for detecting voice activity and background noise/silence in a speech signal using pitch and signal to noise ratio information A method and apparatus for generating frame voicing decisions for an incoming speech signal having periods of active voice and non-active voice for a speech encoder in a speech communications system. A predetermined set of parameters is extracted from the... | 08/14/2001 |
| 6260010 | Speech encoder using gain normalization that combines open and closed loop gains A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding modes, an accurate representation of speech through CELP (co... | 07/10/2001 |
| 6256606 | Silence description coding for multi-rate speech codecs Silence description coding for multi-rate speech coding systems that employ discontinued transmission. Speech coding systems include multi-rate speech codecs having an encoder and a decoder. The silence description coding is performed in either the encode... | 07/03/2001 |
| 6240386 | Speech codec employing noise classification for noise compensation A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding modes, an accurate representation of speech through CELP (co... | 05/29/2001 |
| 6205423 | Method for coding speech containing noise-like speech periods and/or having background noise A method of coding speech under background noise conditions or during noise-like speech periods wherein during active voice speech segments an analysis-by-synthesis method is used. However, when a background noise segment or noise-like speech segment is d... | 03/20/2001 |
| 6188981 | Method and apparatus for detecting voice activity in a speech signal A method and apparatus for generating frame voicing decisions for an incoming speech signal having periods of active voice and non-active voice for a speech encoder in a speech communications system. A predetermined set of parameters is extracted from the... | 02/13/2001 |
| 6122611 | Adding noise during LPC coded voice activity periods to improve the quality of coded speech coexisting with background noise A system and method to improve the quality of coded speech coexisting with background noise. For instance, the present invention receives a coded speech signal via a communication network and then decodes and synthesizes the different parameters contained... | 09/19/2000 |
| 6104994 | Method for speech coding under background noise conditions A method of coding speech under background noise conditions wherein during active voice speech segments an analysis-by-synthesis method is used. However, when a background noise segment is detected, an adaptive code book (pitch prediction) contribution is... | 08/15/2000 |
