Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1990-08-15
1992-04-07
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
381 12, H04H 500
Patent
active
051034808
ABSTRACT:
There is provided a FMX ID signal detection apparatus for discriminating between a FM broadcasting by means of a FM signal including a sum and difference signals M and S obtained from stereophonically related audio frequency source signals by matrix processing and a FMX broadcasting by means of a FMX composite signal including a compressed difference signal SD obtained by compresssing the dynamic range of the signal S, a FMX identification signal and the signals M and S. The apparatus comprises a reproducer for reproducing the signals M and S when the FM signal is applied thereto and for reproducing the signals M and S and the signal SD when the FMX composite signal is applied thereto, a filter for picking a frequency component corresponding to the FMX identification signal from the signal SD, a detector for detecting the FMX identification signal from the freqency component to produce a FMX detection signal, a PLL circuit for producing a control signal in the case of locking onto the frequency component and a mode/dematrix circuit for performing dematrix processing at FM mode when the signals M and S are applied thereto to produce the source signals and also performing dematrix processing at FMX mode when the signals M and S, the signal SD, the FMX detection signal and the control signal are applied thereto to produce the source signals.
REFERENCES:
patent: 4420658 (1983-12-01), Loughlin
patent: 4485483 (1984-11-01), Torick et al.
patent: 4809328 (1989-02-01), Usui et al.
patent: 4914680 (1990-04-01), Tanno et al.
patent: 4982431 (1991-01-01), Tanno
"88' Sanyo Semiconductor Data Book . . . Bipolar Integrated Circuit in Car Audio Use", pp. 229-233.
Chen Sylvia
Isen Forester W.
Victor Company of Japan
LandOfFree
FMX identification signal detection apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with FMX identification signal detection apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FMX identification signal detection apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1901401