An implementation of a variable rate codec based on ADPCM with multi-quantizer (ADPCM-MQ)
| Autor: | Shigeyuki Unagami, Tomohiko Taniguchi, Tomita Yoshihiro, Kohei Iseda |
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| Rok vydání: | 2003 |
| Předmět: |
Digital signal processor
Analog transmission Adaptive differential pulse-code modulation Computer science Quantization (signal processing) Speech recognition computer.file_format Full Rate Audio bit depth Variable bitrate Adaptive Multi-Rate audio codec Bit rate Codec Digital signal Pulse-code modulation computer Algorithm Harmonic Vector Excitation Coding |
| Zdroj: | IEEE Global Telecommunications Conference and Exhibition. Communications for the Information Age. |
| DOI: | 10.1109/glocom.1988.26001 |
| Popis: | 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 the combined use of constant SNR (signal/noise ratio) and constant noise to determine optimum bit/rate control of the VRC. This algorithm was implemented using six digital signal processor chips. The average bit rate of the prototype codec for the telephone voice channel was about 23 kb/s, including supplementary information, and a quality better than that specified in G.721 (32 kb/s ADPCM) was observed. > |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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