Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1988-07-15
1989-05-02
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
H04H 500
Patent
active
048275158
ABSTRACT:
A digital demodulator demodulates and separates the individual components of a digitized stereo multiplex signal which contains a narrowband information channel at three times the pilot signal frequency. Demodulation is accomplished by means of five digital demodulators to which respective carriers are applied from a carrier conditoning circuit. Each carrier has a frequency of the pilot signal frequency, twice the pilot signal frequency or three times the pilot signal frequency. The carriers are generated as data word sequences which contain only the values +1, -1 and 0. The sampling interval for the remaining carrier is 60.degree., beginning from 0.degree.. The signal sampling frequencies are adapted to the different sampling frequencies of the carriers by means of decimation circuits. Each of the six components is freed from interfering adjacent signals by a low-pass filter.
REFERENCES:
patent: 4404430 (1983-09-01), Ogita
patent: 4485483 (1984-11-01), Torick et al.
"Neue Entwicklung auf Horfunkwellen", Funkschau, vol. 58, No. 1, Jan. 1986, by H. Dernedde-Jessen et al., pp. 63-74.
"Grunes Licht fur den Verkehrsfunk", Funkschau, vol. 46, No. 14, Jul. 1974, by J. Conrad, pp. 535-538.
Deutsche ITT Industries GmbH
Isen Forester W.
Peterson Thomas L.
LandOfFree
Digital demodulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital demodulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital demodulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-591017