Patent
Voice coding method and device
TLDR
In this article, the authors proposed to simply switch the bit rate by providing multiple coding sections for the vector quantization of the time base wave-form, reference-inputting the quantization error of the (N-1)th stage for the coding of the Nth stage, and selecting the quantisation output of each stage to switch bit rate.Abstract:
PROBLEM TO BE SOLVED: To simply switch the bit rate by providing multiple coding sections for the vector quantization of the time base wave-form, reference-inputting the quantization error of the (N-1)th stage for the coding of the Nth stage, and selecting the quantization output of each stage to switch the bit rate SOLUTION: The second coding section 120 having a CELP coding structure is constituted of multiple vector quantization process sections, eg two coding sections 1201 , 1202 When the vector quantization by the closed loop search of the first stage is finished, the quantization error of the (N-1)th stage is used as the reference input for the quantization of the Nth stage (2<=N) The calculation quantity is reduced The case that both index outputs of two coding sections 1201 , 1202 are used and the case that only the output of the coding section 1201 of the first stage is used are switched, and the bit number can be simply switchedread more
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Patent
Selection of scalar quantixation (SQ) and vector quantization (VQ) for speech coding
Yang Gao,Adil Benyassine +1 more
TL;DR: In this paper, a pitch pre-processing procedure was proposed for processing the input speech signal to form a revised speech signal biased toward an ideal voiced and stationary characteristic, which allowed the encoder to fully capture the benefits of a bandwidth-efficient, long-term predictive procedure for a greater amount of speech components of an input speech input signal than would otherwise be possible.
Patent
Open-loop pitch processing for speech coding
TL;DR: In this article, an input speech signal is encoded by selecting a final pitch lag from a plurality of pitch lag candidates, on the basis of determination of formation of voice or silence voice in at least one frame of preceding frames.