Patent
Systems and methods for encoding and decoding speech for lossy transmission networks
Leon Bialik
- 15 Apr 2002
42
TL;DR: In this article, a voice encoder utilizes future data, such as the lookahead data typically available for linear predictive coding (LPC), to partially encode a future packet and to send the partial encoding as part of the current packet.
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Abstract: A voice encoder which utilizes future data, such as the lookahead data typically available for linear predictive coding (LPC), to partially encode a future packet and to send the partial encoding as part of the current packet. A decoder utilizes the partial encoding of the previous packet to decode the current packet if the latter did not arrive properly.
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Citations
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Audio encoder and decoder
Per Hedelin,Pontus Jan Carlsson,Jonas Samuelsson,Michael Schug +3 more
- 30 Dec 2008
TL;DR: In this article, a linear prediction unit for filtering an input signal based on an adaptive filter; a transformation unit for transforming a frame of the filtered input signal into a transform domain; and a quantization unit for quantizing the transform domain signal.
170
Patent
Method and apparatus for performing packet loss or frame erasure concealment
David A. Kapilow
- 19 Apr 2000
TL;DR: In this article, a method and apparatus for performing packet loss or frame erasure concealment (FEC) for a speech coder that does not have a built-in or standard FEC process is described.
163
Patent
Methods for improving high frequency reconstruction
Kristofer Kjörling,Ekstrand Per,Holger Hoerich +2 more
- 28 Nov 2002
TL;DR: In this article, a detection mechanism on the encoder side is used to assess what parts of the spectrum will not be correctly reproduced by the HFR method in the decoder.
120
Patent
Sub-band voice codec with multi-stage codebooks and redundant coding
Tian Wang,Kazuhito Koishida,Hosam A. Khalil,Xiaoqin Sun,Wei-ge Chen +4 more
- 05 Apr 2006
TL;DR: In this article, techniques and tools related to coding and decoding of audio information are described, as well as tools and techniques related to decoding audio information, such as redundant coded information for decoding a current frame includes signal history information associated with only a portion of a previous frame.
100
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TL;DR: A method for encoding a signal that includes a speech component that is classified in one of at least two modes, based, for example, on pitch stationarity, short-term level gradient or zero crossing rate, is described.
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Vector adaptive predictive coder for speech and audio
Juin-Hwey Chen,Allen Gersho +1 more
TL;DR: In this article, a vector adaptive predictive coder is proposed, which approximates each vector of K speech samples by using each fixed vectors in a first codebook to excite a time-varying synthesis filter and picking the vector that minimizes distortion.
Speech coding system and method using voicing probability determination
TL;DR: A modular system and method is provided for encoding and decoding of speech signals using voicing probability determination and the use of the system in the generation of a variety of voice effects.
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Patent
Pitch delay modification during frame erasures
Shoham Yair
- 29 May 1996
TL;DR: In a speech decoder which experiences frame erasure, the pitch delay associated with the first of consecutive erased frames is incremented as mentioned in this paper, and the incremented value is used as pitch delay for the second successive erased frames.
130
Analysis-by-synthesis 2,4 kbps linear predictive speech codec
TL;DR: In this article, a linear predictive speech codec is proposed, which includes a spectrum synthesizer for providing reconstructed speech generation in response to excitation signals; a distortion analyzer for comparing the reconstructed speech with an original speech, and providing a distortion analysis signal in response of such comparison.
110