Spectral-Envelope-Based Least Significant Bit Management for Low-Delay Bit-Error-Robust Speech Coding
Ryosuke Sugiura, Yutaka Kamamoto, Takehiro Moriya
Abstract
We have devised a method for bit assignment of quantized frequency spectra aiming at its use in low-delay bit-error-robust speech compression. The proposed method, least significant bit management (LSBM), controls the least significant bits of the spectra based on their envelope to make them represented by fixed bit rates, which guarantees the range of the damage caused by the bit error which makes the mismatch of the spectral envelopes between the encoder and the decoder. In addition, we relate the method to the linear predictive coding scheme and show its performance and robustness in a speech codec by objective and subjective evaluations. The codec based on this method, having bit-error robustness with only 1.5-ms algorithmic delay, can be useful at such situations as real-time speech communication with non-IP protocols.
BibTeX
@inproceedings{icassp2018_spectralenvelope,
title = {Spectral-Envelope-Based Least Significant Bit Management for Low-Delay Bit-Error-Robust Speech Coding},
author = {Ryosuke Sugiura and Yutaka Kamamoto and Takehiro Moriya},
booktitle = {ICASSP 2018},
year = {2018}
}