Patent
1974-11-25
1976-05-11
Olms, Douglas W.
179 1G, H04H 500
Patent
active
039565947
ABSTRACT:
An indicating circuit for an FM stereophonic signal receiver for providing dual indications of tuning and channel balance. The indicating circuit is comprised of a tuning detecting circuit for providing a first signal admitting of a magnitude and polarity which represents the relative tuning condition of the FM receiver with respect to a received FM signal. The indicating circuit further includes respective channel level detecting circuits for providing respective signals admitting of magnitudes that represent the levels of the audio signals transmitted through the respective stereophonic signal channels of the receiver. A signal indicating meter provides indications representing the magnitudes and polarities of signals applied thereto and a switching circuit selectively supplies the output of the tuning detecting circuit or the outputs of the channel level detecting circuits to the indicating meter, whereby the relative tuning condition of the receiver as well as the channel balance of the receiver is selectively indicated.
REFERENCES:
patent: 2712596 (1955-07-01), Sherman
patent: 3526838 (1970-09-01), Banick
patent: 3569633 (1971-03-01), Brahman
patent: 3696301 (1972-10-01), Hoshi
A Pilot Phase Monitor for FM Stereophonic Broadcasting by Dias et al., AES Preprint, Oct. 18, 1963.
The Audio Check by Shields, Electronics World, Jan. '61, pp. 56, 57.
Eslinger Lewis H.
Olms Douglas W.
Sinderbrand Alvin
Sony Corporation
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