FMX identification signal detection apparatus

Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo

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381 12, H04H 500

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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.

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