Patent
Concealment of frame erasures and method
TLDR
In this article, a decoder for code excited LP encoded frames with both adaptive and fixed codebooks was proposed, and erased frame concealment uses repetitive excitation plus a smoothing of pitch gain in the next good frame, plus multilevel voicing classification with multiple thresholds of correlations determining linear interpolated adaptive and codebook excitation contributions.Abstract:
A decoder for code excited LP encoded frames with both adaptive and fixed codebooks; erased frame concealment uses repetitive excitation plus a smoothing of pitch gain in the next good frame, plus multilevel voicing classification with multiple thresholds of correlations determining linear interpolated adaptive and fixed codebook excitation contributions.read more
Citations
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Patent
Method and device for efficient frame erasure concealment in linear predictive based speech codecs
Jelinek Milan,Philippe Gournay +1 more
TL;DR: In this article, a method and device for improving concealment of frame erasure caused by frames of an encoded sound signal erased during transmission from an encoder (106) to a decoder (110), and for accelerating recovery of the decoder after non erased frames of the encoded sound signals have been received.
Patent
Sub-band voice codec with multi-stage codebooks and redundant coding
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.
Patent
Packet loss concealment for sub-band predictive coding based on extrapolation of sub-band audio waveforms
TL;DR: In this paper, a technique for concealing the effect of a lost frame in a series of frames representing an encoded audio signal in a sub-band predictive coding system is described.
Patent
Audio decoding device and compensation frame generation method
TL;DR: In this article, an audio decoding device capable of improving audio quality of a decoded signal by considering the energy change of a past signal in loss compensation processing was proposed, where an energy change calculation unit (143) calculates an average energy of an audio source signal of one-pitch cycle from the end of the ACB vector outputted from an adaptive codebook (106).
Patent
Adaptive voice playout in VOP
TL;DR: Packetized CELP-encoded speech playout with frame truncation during silence and frame expansion method dependent upon voicing classification with voiced frame expansion maintaining phasealignment.
References
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Patent
Method for signal controlled switching between different audio coding schemes
Ralf Kirchherr,Joachim Stegmann +1 more
TL;DR: In this paper, a method for signal controlled switching between audio coding schemes includes receiving input audio signals, classifying a first set of the input audio signal as speech or non-speech signals, coding the speech signals using a time domain coding scheme, and coding the nonspeech signal using a transform coding scheme.
Patent
Methods for generating comfort noise during discontinuous transmission
TL;DR: An improved method for generating comfort noise (CN) in a mobile terminal operating in a discontinuous transmission (DTX) mode is presented in this article, in which a random excitation is modified by a spectral control filter so that the frequency content of comfort noise and background noise become similar.
Patent
Pitch delay modification during frame erasures
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.
Patent
High quality low bit rate celp-based speech codec
TL;DR: In this article, a low-bit-rate speech decoder is proposed, which operates in two modes depending on the received mode bit, pitch prefiltering and global post-filtering are employed for enhancement of the synthesized speech.
Patent
Voiced/unvoiced classification of speech for excitation codebook selection in celp speech decoding during frame erasures
Peter Kroon,Yair Shoham +1 more
TL;DR: In this article, the CS-ACELP decoder generates a speech excitation signal selectively based on output signals from said first and second portions when said decoder fails to receive reliably at least a portion of a current frame of compressed speech information.