Title :
A multi-rate transcoder
Author :
Lovrich, AI ; Reimer, Jay
Author_Institution :
Texas Instrum. Inc., Houston, TX, USA
fDate :
11/1/1989 12:00:00 AM
Abstract :
The authors describe a single-chip, half-duplex multirate transcoder device. The device is pin selectable as a 32-kb/s ADPCM (adaptive differential pulse code modulation) transcoder and a 16-kb/s subband coding transcoder, and it provides a 64-kb/s PCM passthrough option. The transcoder implementation is fully compatible with the 32-kb/s ADPCM standard defined by ANSI and CCITT recommendation G.721 bis. The subband coder (SBC) algorithm provides a high-quality, cost-effective medium bit-rate solution. The ADPCM and SBC implementations on the device produce toll quality speech
Keywords :
decoding; encoding; pulse-code modulation; standards; vocoders; 16 kbit/s; 32 kbit/s; 64 kbit/s; ADPCM standard; ANSI; CCITT recommendation G.721 bis; PCM passthrough option; adaptive differential pulse code modulation; cost-effective medium bit-rate solution; half-duplex multirate transcoder device; pin selectable; single-chip; subband coding transcoder; toll quality speech; vocoders; ANSI standards; Artificial intelligence; Bandwidth; Bit rate; Channel capacity; Codecs; Costs; Phase change materials; Pulse modulation; Transcoding;
Journal_Title :
Consumer Electronics, IEEE Transactions on
