Integrable circuit for identifying a pilot tone

Details Integrable circuit for identifying a pilot tone Integrable circuit for identifying a pilot tone

1986-02-20

1987-09-15

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 4, H04H 500

Patent

active

046944958

ABSTRACT:
A circuit serves to extract one of two or more pilot tones which are modulated on an audio-frequency signal to select an appropriate decoder, and which cause a changeover to the appropriate decoder or of a decoding signal processor. To this end, one of the stereo signals is digitized by means of a clocked analog-to-digital converter, and the audio signal is separated from the pilot-signal-containing component by means of a pilot-tone-range filter and then averaged over a number of clock periods of the analog-to-digital converter by means of a sampling averager. The output signal of the averager is applied to the inputs of pilot-tone filters, then rectified to measure the signal energy, and applied to the inputs of low-pass filters. The outputs of the low-pass filter control a logic circuit which causes the two audio-frequency signals to be applied to the input of the appropriate decoder.

REFERENCES:
patent: 4021653 (1977-05-01), Sharp et al.
patent: 4197525 (1980-04-01), Biery, Jr. et al.
patent: 4216463 (1980-08-01), Backof, Jr. et al.
patent: 4358733 (1982-11-01), Hanahara
patent: 4614909 (1986-09-01), Jarvfalt
Winterer, "Signal Prozessor lost rechenintensive Probleme", Elektronik, 22/2-11, 1984, pp. 143-151, (Nov. 2, 1984).

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