Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Shigeyuki Unagami"'
Publikováno v:
IEEE Communications Magazine. 28:49-55
Practical echo cancellation techniques, in particular, those used in telecommunications, are reviewed. The various situations in which echoes are generated are examined. Echo path modeling techniques and adaptive algorithms for coefficient control ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92ca619010cd3930af9ff7e249fa702d
https://doi.org/10.1109/35.46671
https://doi.org/10.1109/35.46671
Publikováno v:
ICASSP
This paper describes a newly developed CMOS LSI DSP and its application to a 32 Kbps ADPCM CODEC and a 4,800 bps data MODEM. The paper first analizes the required memory capacities of ROM and RAM as a function of arithmatic operation capability of DS
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7eaf437667ac136b59e9f2957468e9fd
https://doi.org/10.1109/icassp.1983.1172149
https://doi.org/10.1109/icassp.1983.1172149
Publikováno v:
ICASSP
Recently much intensive research of 16kbps Speech coding algorithm has been conducted aiming to reduce the transmission bit rate and yet provides high speech quality. Adaptive predictive coding with adaptive bit allocation (APC-AB)[1] is considered t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38ea4e17c70cb4a7024037478e0c5c01
https://doi.org/10.1109/icassp.1986.1169050
https://doi.org/10.1109/icassp.1986.1169050
Publikováno v:
ICASSP
This paper describes an implementation of a new 16 kbps speech codec using commercially available DSPs and its performance. The coding algorithm chosen here is ADPCM with Multi-Quantizer (ADPCM-MQ) which selects the optimum ADPCM coder frame by frame
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d125243e9f4666493fcb9af31027e9f5
https://doi.org/10.1109/icassp.1987.1169513
https://doi.org/10.1109/icassp.1987.1169513
Publikováno v:
ICASSP
Adaptive differential PCM (ADPCM) is an effective coding scheme to simplify the hardware and shorten the processing delay to realize a high-efficiency speech codec. The ADPCM with Multi-Quantizer (ADPCM-MQ) coding has been proposed as one of the high
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b1432ac17e95b39c4604916c4cbbc96
https://doi.org/10.1109/icassp.1986.1169248
https://doi.org/10.1109/icassp.1986.1169248
Publikováno v:
ICASSP
The authors introduce a novel approach to narrow- and medium-band speech coding that can dynamically balance the transmission rate between the excitation and the spectral parameters. The coding algorithm, called multimode coding, operates several cod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9afc31a5a387e80166d9a839d826388e
https://doi.org/10.1109/icassp.1989.266387
https://doi.org/10.1109/icassp.1989.266387
Publikováno v:
IEEE Global Telecommunications Conference and Exhibition. Communications for the Information Age.
Discusses an implementation of an experimental variable bit rate codec (VRC) based on adaptive differential pulse code modulation with a multiquantizer (ADPCM-MQ) that processes speech signals at 16 kb/s to 48 kb/s. The authors propose a method for t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c4118b065781555ff0d4b34cac78e0e4
https://doi.org/10.1109/glocom.1988.26001
https://doi.org/10.1109/glocom.1988.26001
Publikováno v:
ICASSP
A new 8 kbps speech coding algorithm called TC-MQ (time domain compression ADPCM-MQ) is proposed. It is based on time scale modification and sub-band coding with the aid of ADPCM with a multiquantizer. For time scale modification, the decimation/inte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f0093a25b56a0fa604c6b101cc83a005
https://doi.org/10.1109/icassp.1988.196564
https://doi.org/10.1109/icassp.1988.196564
Publikováno v:
MILCOM 88, 21st Century Military Communications - What's Possible?'. Conference record. Military Communications Conference.
The authors propose a 4.8-kbps voice-coding algorithm using pitch-synchronous discrete Fourier transform (DFT). This algorithm combines time-scale compression with pitch-synchronous DFT spectrum coding. It also discards the time-compressed signal-pha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::54a5f237cdc03606fbc4d2eeed37fae9
https://doi.org/10.1109/milcom.1988.13368
https://doi.org/10.1109/milcom.1988.13368
Publikováno v:
ICASSP
A multimode source/channel coder which can dynamically control the balance of source and channel coding according to the channel quality is introduced. As an example of such a system, a 4.8-kb/s code excited linear predictive coder with three coding
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f2c44f33e8dd12ae497d4240d0a2318
https://doi.org/10.1109/icassp.1990.115753
https://doi.org/10.1109/icassp.1990.115753