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GSM 06.10 compresses frames of 160 13-bit samples (8 kHz sampling rate, i.e. a frame rate of 50 Hz) into 260 bits; for compatibility with typical UNIX applications, our implementation turns frames of 160 16-bit linear samples into 33-byte frames (1650 Bytes/s). The quality of the algorithm is good enough for reliable speaker recognition; even music often survives transcoding in recognizable form (given the bandwidth limitations of 8 kHz sampling rate).
The interfaces offered are a front end modelled after compress(1), and a library API. Compression and decompression run faster than realtime on most SPARCstations. The implementation has been verified against the ETSI standard test patterns.
TOAST(1) TOAST(1) NAME toast — GSM 06.10 lossy sound compression SYNOPSIS toast [ -cdfpvhualsFC ] [ filename... ] untoast [ -cfpvhuaslF ] [ filename... ] tcat [ -vhuaslF ] [ filename... ] DESCRIPTION Toast compresses the sound files given on its command line. Each file is replaced by a file with more»