Complexity reduction methods for vector excitation coding

Davidson, Grant; Gersho, A.

doi:10.1109/icassp.1986.1168574

Cited by 83 publications

(9 citation statements)

References 7 publications

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“…1 das amostras de cada vetor-codigo [8], [15], [14]. 0 valor es colhido para N«: corresponde a uma percentagem de 12,5%.…”

Section: Testes E Resultadosunclassified

Dicionário Estocástico Multipulso para Codificadores CELP

Silva¹,

Alcaim²

1998

Journal of Communication and Information Systems

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Resumo -Este artigo apresenta uma nova tecnica de projeto de dicionarios de vetores esparsos para codificadores CELP (Code Excited Linear Prediction), baseada no esquema de ex citacao multipulso e no algoritmo LBG (Linde-Buzo-Gray) de treinamento. 0 dicionario resultante -denorninado multi pulso ou, simplesmente, :MP-possui as vantagens inerentes aos dicionarios esparsos convencionais. Seu grande merito e ter ainda a vantagem de poder ser otimizado atraves de urn procedimento de treinamento. Atraves de simulacoes, 0 di cionario :MP foi comparado com os dicionarios gaussiano e "vector-sum" (VS). Os resultados mostraram que, dentre os tres tipos de dicionario testados, 0 dicionario :MP e0 que tern melhor desempenho em termos da qualidade da voz codifi cada. Neste artigo, sao apresentadas tambem comparacoes quanta acomplexidade associada aos tres dicionarios, Abstract -This paper presents a new algorithm to design co debooks of sparse vectors for code excited linear prediction (CELP) speech encoders. The algorithm is based on multi pulse excitations and on the LBG codebook training algo rithm. The codebooks, which are referred to as multi pulse (:MP) codebooks, have the inherent advantages of sparse co debooks. Moreover, they can be optimized by a closed-loop training procedure. We present a comparative analysis of the:MP codebook with vector-sum (VS) and Gaussian code books. Simulation results show that the :MP codebook yields the best performance in terms of speech quality. Complexities of these codebooks are also compared.Palavras chaves -Codificacao de Voz, CELP, Otimizacao de Dicionario.

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“…1 das amostras de cada vetor-codigo [8], [15], [14]. 0 valor es colhido para N«: corresponde a uma percentagem de 12,5%.…”

Section: Testes E Resultadosunclassified

Dicionário Estocástico Multipulso para Codificadores CELP

Silva¹,

Alcaim²

1998

Journal of Communication and Information Systems

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“…Our choice is a sparse [6] and shifted [7] codebook. To design the codebook, simulation experiments were performed.…”

Section: Optimization Of the Codermentioning

confidence: 99%

High performance coder: a possible candidate for the GSM half-rate system

Wu¹,

Hansen

Larsen

et al. 1991

[Proceedings] ICASSP 91: 1991 International Conference on Acoustics, Speech, and Signal Processing

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the results from a In this paper we describe our contribution to the ETSI effort for a definition of a GSM (Group Special Mobile) standard half-rate coding system for the pan-European digital mobile cellular radio system. The system consists of a speech coder and a channel coder. An overview of the speech coding algonthm is given. The results from a study of the different versions of the speech coder are described. A two-stage channel coding scheme as presented. The performance test results are shown. A brief overview of the DSP implementation, computational requirements and memory wage is also presented.For the GSM channel coding algorithm which of the coder with a typical mobfie-radio by both random and burst errors.A subjective listening test was pe performance of the candidate coder. presented in section 5. A real-time implementat on the AT&T DSP32C is overview o f t h e comPutati and DSP implementation

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“…Various kinds of research for improving CELP coders to increase quality or lower the bit rate had been actively conducted because the basic quality of CELP coders is high. When the CELP coder was first proposed, it used an excitation code vector that had been modeled using Gaussian noise [1], and methods in which the code vector consisted of a small number of pulses [2][3][4][5], methods in which it was represented by an algebraic structure [6][7][8][9][10], and methods using a glottal source wave model [11][12][13] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

New excitation codebook search methods to reduce perceptual degradation of CELP

Yamaura

Tasaki

Takahashi

2007

Systems & Computers in Japan

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SUMMARYIn this paper, the authors propose three new excitation codebook search methods for suppressing the selection of an excitation code vector that has a high likelihood of producing pulse-like degraded sound in a low-bit-rate CELP coder that uses a pulse-like excitation code vector. The proposed methods are (1) adaptive weighting for coding distortion based on the state of the input speech, (2) weighting for coding distortion due to amplitude distribution distortion in the time direction, and (3) setting an upper limit for the coding distortion rate for pulse-like excitation codebook searches. Although an excitation code vector with large coding distortion is selected if these proposed methods are set from the coding distortion minimization standard that is used in a conventional CELP excitation code vector search, there is an improvement in the quality that is perceived by the sense of hearing. The authors applied the proposed methods to a 4-kbps CELP coder to verify their effectiveness according to subjective quality evaluation experiments. The results verified the effectiveness of the proposed methods by showing that the introduction of the proposed methods improved the MOS value by approximately 0.3 for clean speech and by approximately 0.4 for noise-added speech.

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Complexity reduction methods for vector excitation coding

Cited by 83 publications

References 7 publications

Dicionário Estocástico Multipulso para Codificadores CELP

Dicionário Estocástico Multipulso para Codificadores CELP

High performance coder: a possible candidate for the GSM half-rate system

New excitation codebook search methods to reduce perceptual degradation of CELP

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