FM stereophonic receiver providing a test signal

Details FM stereophonic receiver providing a test signal FM stereophonic receiver providing a test signal

1977-11-03

1978-11-07

Claffy, Kathleen H.

Oscillators

Relaxation oscillators

325363, 331179, H04H 500

Patent

active

041247809

ABSTRACT:
An FM stereophonic receiver includes a system for producing a test signal having an audio frequency and a constant amplitude, permitting an easy setting of the input level of a tape-recorder which will record an FM program through the receiver. The system is so arranged that the oscillation frequency of a voltage-controlled oscillator involved in a phase-locked loop circuitry of a multiplex decoder in the receiver can be changed so as to make it possible to derive the test signal from a certain point in the circuitry. No separate audio signal generator is required for producing the test signal.

REFERENCES:
patent: 2121434 (1938-06-01), Klinedinst et al.

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