Synchronous Tandem Algorithm for 32-kbit/s ADPCM

Taka, M.; Maruta, R.; Guyader, Alain Le

doi:10.1109/tcom.1985.1096255

Cited by 10 publications

(3 citation statements)

References 10 publications

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“…Perhaps its most unique feature is a property called synchronous tandeming. 57 If a circuit involves two ADPCM codings with a /i-law or A-law encoding in between, no additional degradation occurs because of the second encoding. The second bit stream will be identical to the first!…”

Section: Current Standardsmentioning

confidence: 99%

Current Methods of Speech Coding

Cox

1997

Selected Topics in Electronics and Systems

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Digital speech coding is used in a wide variety of every day applications that the ordinary person takes for granted, such as network wireline and cellular telephony and telephone answering machines. This article reviews some of the most currently used methods of speech coding. This includes reviewing the basic attributes of these coders, the methods used for coding and some of the most important speech coding standards. It also reviews the methods used to realize digital speech coders, especially those for implementing these coders in a cost effective manner.

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Section: Current Standardsmentioning

confidence: 99%

Current Methods of Speech Coding

Cox

1997

Selected Topics in Electronics and Systems

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“…Recent research has demonstrated that tandemable ADPCM coders, leading to a doubling of channel capacity, are possible with only a marginal decrease in performance over 64 kbps PCM [6], [7],[11J. CCITT Study Group XVIII has produced a draft recommendation for a tandemable 64 kbps PCM to 32 kbps ADPCM transcoder (referred to as Draft Recommendation G.7zz in this work).…”

Section: Introductionmentioning

confidence: 99%

32kbs ADPCM/PCM transcoder using TI-320 DSP microprocessor

Hangartner

Jain²

ICASSP '85. IEEE International Conference on Acoustics, Speech, and Signal Processing

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The CCITT has recently proposed a Draft Recommendation for a tandemable 64 kbps PCM to 32 kbps ADPCM transcoder algorithm t11,[2. This paper presents a real-time hardware and software realization of the algorithm based on a single TI TMS 32010 each for the encoder and decoder. Objective and subjective results indicate that our changes in the adaptive quantizer and prediction filter, which make this single pP chip realization possible, do not degrade system performance relative to the CCITT algorithm.

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“…The algorithm describes transcoding A-/mu-law PCM to and from the proposed ADPCM. A general description for the algorithm is given in [1][2].…”

Section: Introductionmentioning

confidence: 99%

24-channel 32 kb/s ADPCM transcoder using the CCITT recommendation G.721

Aly¹

ICASSP '86. IEEE International Conference on Acoustics, Speech, and Signal Processing

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The 32 kb/s ADPCI4 staidard algorithm has been published in the CCITT recommendation G.72l. Implementationsfor this algorithm have been proposed in the form of a per-channel transcoder. This paper presents an alternative implementation which is preferred for multi-channel applications. It uses a combination of CMOS EPROM lookup table and CMOS gate array processor technologies. The paper presents the transcoder architecture which is based on a multiprocessor concept.The hardware block diagram and the firmware structure •are discussed. System design and test results were obtained using a hardware prototype in which the functions of the CMOS gate array were temporarily implemented by ALS/Fast standard discrete logic components.

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Synchronous Tandem Algorithm for 32-kbit/s ADPCM

Cited by 10 publications

References 10 publications

Current Methods of Speech Coding

Current Methods of Speech Coding

32kbs ADPCM/PCM transcoder using TI-320 DSP microprocessor

24-channel 32 kb/s ADPCM transcoder using the CCITT recommendation G.721

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