Title :
Enhancement in the 32-kbit/s ADPCM algorithm for FSK voice-band data signals
Author :
Benvenuto, N. ; Bertocci, G.
Author_Institution :
Dipartimento di Elettronica e Autom., Ancona Univ., Italy
fDate :
5/1/1988 12:00:00 AM
Abstract :
Due to the feedback architecture of the standard CCITT and ANSI 32-kb/s ADPCM (adaptive digital pulse-code modulated) coders, large transitional errors occur when characteristics of the input signal suddenly change. This particularly holds for FSK modems that transmit a single-frequency signal between actual characters. A mechanism that identifies these transitions and reduces errors is presented
Keywords :
errors; frequency shift keying; modems; pulse-code modulation; standards; voice communication; 32 kbits/s; ADPCM algorithm; FSK modems; FSK voice-band data signals; adaptive digital pulse-code modulated; coders; feedback architecture; single-frequency signal; standards; transitional errors; Bandwidth; Bridge circuits; Computer network reliability; Encoding; Error analysis; Frequency shift keying; Intelligent networks; Metropolitan area networks; Modems; Noise measurement; Notice of Violation; Protocols; Signal processing; Signal to noise ratio; Telecommunication traffic; Urban areas;
Journal_Title :
Communications, IEEE Transactions on
