FM Broadcast band demodulator/stereo decoder

Details FM Broadcast band demodulator/stereo decoder FM Broadcast band demodulator/stereo decoder

1982-09-30

1984-06-26

Hickey, R. J.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 4, 455280, H04H 500

Patent

active

044570112

ABSTRACT:
An FM broadcast band demodulator and stereo decoder which can be connected to an existing frequency modulated, or FM broadcast tuner or receiver. The unit includes four basic sections; FM demodulation, stereo decoding, audio amplification, and tuning error detection. The FM demodulation is done by an integrated circuit directly coupled to a second integrated circuit which performs the stereo decoding function. The function output signals of the second integrated circuit are re-centered to a direct current or d-c level of zero by voltage dividers and amplified by operational amplifiers to drive a load. The tuning error indicator is connected between the first and second integrated circuits and nullifies the d-c components from the output signal of the first integrated circuit before integrating the output signal to remove the audio portion and leave only an average d-c component. The remaining d-c signal is amplified and applied through a bridge rectifier to a light emitting diode or LED. The LED is lighted upon an imbalance of .+-.0.05 volt in the output signal of the unit.

REFERENCES:
patent: 3842211 (1974-10-01), Metro
patent: 4093824 (1978-06-01), Grosjean
patent: 4131851 (1978-12-01), Martiny et al.
patent: 4224471 (1980-09-01), Ogita

Affiliated with

Also associated with

Rating

FM Broadcast band demodulator/stereo decoder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with FM Broadcast band demodulator/stereo decoder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FM Broadcast band demodulator/stereo decoder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2235501