16 kbps wideband speech coding technique based on algebraic CELP

Laflamme, C.; Adoul, J.-P.; Salami, R.; Morissette, S.; Mabilleau, P.

doi:10.1109/icassp.1991.150267

Cited by 74 publications

(35 citation statements)

References 3 publications

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“…The multi-pulse excitation signal is composed of several non-zero pulses. The pulse positions are restricted in the algebraic-structure codebook and determined by an analysis-by-synthesis approach, (Laflamme et al, 1991;Chomphan, 2010a). The pulse signs and positions are encoded, while the gains for pitch predictor and the multi-pulse excitation are normalized by the frame energy and encoded.…”

Section: Mp-celp Codermentioning

confidence: 99%

Speech Compression of Thai Dialects with Low-Bit-Rate Speech Coders

Chomphan¹

2012

American Journal of Applied Sciences

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Problem statement:In modern speech communication at low bit rate, speech coding deteriorates the characteristics of the coded speech significantly. Considering the dialects in Thai, the coding quality of four main dialects spoken by Thai people residing in four core region including central, north, northeast and south regions has not been studied. Approach: This study presents a comparative study of the coding quality of four main Thai dialects by using different low-bit-rate speech coders including the Conjugate Structure Algebraic Code Excited Linear Predictive (CS-ACELP) coder and the Multi-Pulse based Code Excited Linear Predictive (MP-CELP) coder. The objective and subjective tests have been conducted to evaluate the coding quality of four main dialects. Results: From the experimental results, both tests show that the coding quality of North dialect is highest, meanwhile the coding quality of Northeast dialect is lowest. Moreover, the coding quality of male speech is mostly higher than that of female speech. Conclusion: From the study, it can be obviously seen that the coding quality of all Thai dialects are different.

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Section: Mp-celp Codermentioning

confidence: 99%

Speech Compression of Thai Dialects with Low-Bit-Rate Speech Coders

Chomphan¹

2012

American Journal of Applied Sciences

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“…The multi-pulse excitation signal is composed of several non-zero pulses. The pulse positions are restricted in the algebraic-structure codebook and determined by an analysis-by-synthesis approach, e.g., (Laflamme et al, 1991;Chomphan, 2010a). The pulse signs and positions are encoded, while the gains for pitch predictor and the multi-pulse excitation are normalized by the frame energy and encoded.…”

Section: Mp-celp Core Codermentioning

confidence: 99%

High Pitch Delay Resolution Technique for Tonal Language Speech Coding Based on Multi-Pulse Based Code Excited Linear Prediction Algorithm

Chomphan¹

2011

Journal of Computer Science

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Problem statement:In spontaneous speech communication, speech coding is an important process that should be taken into account, since the quality of coded speech depends on the efficiency of the speech coding algorithm. As for tonal language which tone plays important role not only on the naturalness and also the intelligibility of the speech, tone must be treated appropriately. Approach: This study proposes a modification of flexible Multi-Pulse based Code Excited Linear Predictive (MP-CELP) coder with multiple bitrates and bitrate scalabilities for tonal language speech in the multimedia applications. The coder consists of a core coder and bitrate scalable tools. The High Pitch Delay Resolutions (HPDR) are applied to the adaptive codebook of core coder for tonal language speech quality improvement. The bitrate scalable tool employs multi-stage excitation coding based on an embedded-coding approach. The multi-pulse excitation codebook at each stage is adaptively produced depending on the selected excitation signal at the previous stage. Results: The experimental results show that the speech quality of the proposed coder is improved above the speech quality of the conventional coder without pitch-resolution adaptation. Conclusion: From the study, it is a strong evidence to further apply the proposed technique in the speech coding systems or other speech processing technologies.

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“…This has several operating codec modes which are switched adaptively in accordance to the dynamics of the channel (good or bad channel). The process of dynamically switching due to varying channel conditions is known as AMR adaptation [3] [6]. The use of AMR codec also requires that optimized link adaptation is used so that the optimum data rate is selected to meet the requirements of the current radio channel conditions including its signal to noise ratio and capacity.…”

Section: A Adaptive Multi Rate Codermentioning

confidence: 99%

“…The computation of the error condition quality in uplink and downlink channel is determined by the ratio of signal carrier (C) to interference (I) which expressed Fig 1.3 AMR block diagram [9] in dB. The working process of the uplink and downlink channel in AMR is going on repeatedly [3] [6]. This means that if there is a sudden change in the channel condition, then there will also be a change in the codec mode in accordance with the channel condition at that moment.…”

Section: Vmentioning

confidence: 99%

Study and Performance of AMR Codecs for GSM

Choudhary¹,

Kumar²

2014

International Journal of Advanced Research in Computer and Comm

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Abstract:In wireless communication system, limited bandwidth and power is the primary restriction. The existing wireless systems involved in transmission of speech visualized that efficient and effective methods be developed to transmit and receive the same while maintaining quality of speech, especially at the receiving end. Speech coding technique is a material of research for the scientific and academic community since the era of digitization (digital). Amongst all elements of the communication systems (transmitter, channel and receiver), transmission channel is the most critical and plays a key role in the transmission and reception of information. The quality of speech at receiver end decides by channel conditions. Modelling a channel is a multifarious task. A number of techniques are adopted to alleviate the effect of the channel. Adaptive Multi Rate is one of the techniques that neutralize the deleterious effect of the channel on speech. This technique utilizes variable bit rate that dynamically switches to specific modes of operation depending upon the channel conditions. For example, Low bit rate mode of operation is selected in adverse channel conditions, this helps to provide more error protection bits for channel coding and vice versa. Therefore, in this paper, application of Code Excited Linear Prediction (CELP) source codec on speech followed by AMR codec is studied. Further, higher the bit rate used, the better is the quality of speech. In this paper apart from speech codec about AMR is also studied that why the AMR is proposed for the GSM, how the bits rates are reduced in AMR, operation of AMR and other applications of AMR.

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16 kbps wideband speech coding technique based on algebraic CELP

Cited by 74 publications

References 3 publications

Speech Compression of Thai Dialects with Low-Bit-Rate Speech Coders

Speech Compression of Thai Dialects with Low-Bit-Rate Speech Coders

High Pitch Delay Resolution Technique for Tonal Language Speech Coding Based on Multi-Pulse Based Code Excited Linear Prediction Algorithm

Study and Performance of AMR Codecs for GSM

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