Patent
Audio Encoding Device, Audio Decoding Device, and Method Thereof
Kaoru Mats. El. Ind. Co. Ipro Ip Dev. Ct. Sato,Toshiyuki Mats. El. Ind. Co. Iproc Ip Morii,Tomofumi Yamanashi +2 more
TLDR
In this paper, an audio encoding device capable of realizing effective encoding while using audio encoding of the CELP method in an extended layer when hierarchically encoding an audio signal was disclosed.Abstract:
There is disclosed an audio encoding device capable of realizing effective encoding while using audio encoding of the CELP method in an extended layer when hierarchically encoding an audio signal. In this device, a first encoding unit (115) subjects an input signal (S11) to audio encoding processing of the CELP method and outputs the obtained first encoded information (S12) to a parameter decoding unit (120). The parameter decoding unit (120) acquires a first quantization LSP code (L1), a first adaptive sound source lag code (A1), and the like from the first encoded information (S12), obtains a first parameter group (S13) from these codes, and outputs it to a second encoding unit (130). The second encoding unit (130) subjects the input signal (S11) to a second encoding processing by using the first parameter group (S13) and obtains second encoded information (S14). A multiplexing unit (154) multiplexes the first encoded information (S12) with the second encoded information (S14) and outputs them via a transmission path N to a decoding device (150).read more
Citations
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Patent
Encoding device, decoding device, and method thereof
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References
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Proceedings ArticleDOI
Code-excited linear prediction(CELP): High-quality speech at very low bit rates
Manfred R. Schroeder,B. S. Atal +1 more
TL;DR: A code-excited linear predictive coder in which the optimum innovation sequence is selected from a code book of stored sequences to optimize a given fidelity criterion, indicating that a random code book has a slight speech quality advantage at low bit rates.
PatentDOI
Speech coding and decoding apparatus
Masami Akamine,Kimio Miseki +1 more
TL;DR: In this article, a speech signal is input to an excitation signal generating section, a prediction filter and a prediction parameter calculator, and the codes of the prediction parameters are sent to a decoder and a multiplexer.
Patent
Encoding and decoding speech signals variably based on signal classification
TL;DR: In this article, a speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed, which optimizes the bandwidth consumed by the bitstream by balancing the desired average bit rate with the perceptual quality of the reconstructed speech.
Patent
Transcoding method and system between CELP-based speech codes
TL;DR: In this paper, a method for transcoding a CELP-based compressed voice bitstream from source codec to destination codec is proposed, which includes processing a source codec input cELP bitstream to unpack at least one or more CELPs from the input bitstream and interpolating a plurality of unpacked cELPs.
Patent
Voice coding and decoding system
TL;DR: In this article, a first CELP coding circuit receives a signal obtained by down-sampling of an input signal by a downsampling circuit, outputs a part of coded output to a second coding circuit, which encodes the input signal on the basis of the coded output of the first coding circuit.