Title :
A digital FSK discriminator circuit
Author :
Hughes, P.M. ; Hall, M.C. ; Lind, L.F.
Author_Institution :
British Telecom Res. Lab., Martlesham Heath, Ipswich, UK
Abstract :
A technique is proposed which allows accurate discrimination between two FSK keying tones. The technique is used to develop a digital discriminator for the 1200 baud signal generated by CCITT V23 type modems. Simulation of the proposed system has shown that under ideal conditions, the isochronous distortion observed at the output of this system can be reduced to less than 1%. Further tests which have been carried out on this discriminator circuit show that it is relatively robust and retains its excellent performance in more practical implementations.<>
Keywords :
demodulators; digital circuits; discriminators; frequency shift keying; 1200 bit/s; CCITT V23 type modems; FSK discriminator circuit; digital discriminator; frequency shift keying; isochronous distortion; Circuit noise; Digital filters; Finite impulse response filter; Frequency shift keying; Laboratories; Modems; Signal generators; Signal processing; Telecommunications; Timing;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo, Finland
DOI :
10.1109/ISCAS.1988.14882
