Arrangement for selectively routing a signal indicative of recei

Details Arrangement for selectively routing a signal indicative of recei Arrangement for selectively routing a signal indicative of recei

1980-04-24

1982-05-18

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455194, 455200, H03J 718

Patent

active

043308660

ABSTRACT:
An integrated circuit for processing the IF signal of a radio receiver to produce an audio signal also includes a muting circuit for muting the audio signal, detector circuits for generating a stop signal which, e.g., may be used to stop the operation of a scanning tuner when the IF signal has a predetermined condition, an inhibiting circuit for inhibiting the generation of the stop signal and a signal strength for generating positive-going and negative-going signals representing the amplitudes of an RF input signal. The integrated circuit also includes a comparator circuit having first and second input terminals to which the signal strength and stop pulse signals may be applied in a variety of configurations to determine when the RF signal has respective predetermined amplitude conditions and a signal routing circuit for selectively applying the output signal of the comparator circuit to the muting and stop pulse inhibiting circuits in different combinations to accommodate different operating environments of the receiver in response to the level of a routing control signal applied to a control terminal.

REFERENCES:
patent: 3584307 (1971-06-01), Hewie
patent: 3825838 (1974-07-01), Mayle
patent: 4123715 (1978-10-01), Fathauer
patent: 4140960 (1979-02-01), Ohsawa
patent: 4245348 (1981-01-01), Imazeki
RCA data sheet for CA3189E, File Number 1046, dated 9-78.

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