A multi-rate transcoder

Author

Lovrich, AI ; Reimer, Jay

Author_Institution

Texas Instrum. Inc., Houston, TX, USA

Volume

35

Issue

4

fYear

1989

fDate

11/1/1989 12:00:00 AM

Firstpage

715

Lastpage

722

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;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.106888

Filename

106888