Name
Abstract | ||
|---|---|---|
High-quality speech codec modules operating at 16 and 8 kb/s have been developed using an adaptive predictive coding with adaptive bit allocation (APC-AB) scheme. An optimized APC-AB algorithm is studied that reduces processing complexity while maintaining speech quality. The coding algorithm is implemented in two digital signal processors (DSPs). The DSP chips, a framing LSI circuit, a PCM codec, and some peripheral ICs are integrated in each of two compact packages, i.e. codec modules, operating at 16 or 8 kb/s. The codec module size is as small as 80 mm×50 mm×12 mm, and its typical power consumption is 500 mW using 2-μm CMOS LSI technology. At 16 kb/s this APC-AB codec achieves high speech quality, close to that of a 7-bit μ-law PCM. The codec modules are expected to be used for various applications such as customer premises multiplexers for digital leased lines, digital mobile radio, and stored-and-forward-message systems (voice-mail systems) |
Year | DOI | Venue |
|---|---|---|
1988 | 10.1109/49.614 | Selected Areas in Communications, IEEE Journal |
Keywords | Field | DocType |
CMOS integrated circuits,codecs,encoding,large scale integration,pulse-code modulation,speech analysis and processing,vocoders,voice equipment,12 mm,16 kbits/s,2 micron,50 mm,500 mW,8 kbits/s,80 mm,APC-AB codec modules,CMOS LSI technology,DSP chips,PCM codec,adaptive bit allocation,adaptive predictive coding,coding algorithm,compact packages,customer premises multiplexers,digital leased lines,digital mobile radio,digital signal processors,framing LSI circuit,peripheral ICs,processing complexity,speech codec,speech quality,stored-and-forward-message systems,voice-mail systems | Pulse-code modulation,Digital signal processing,Speech coding,Data transmission,Adaptive Multi-Rate audio codec,Computer science,Full Rate,Adaptive predictive coding,Codec,Embedded system | Journal |
Volume | Issue | ISSN |
6 | 2 | 0733-8716 |
Citations | PageRank | References |
2 | 0.42 | 3 |
Authors | ||
3 | ||