Signal overload prevention circuit

Details Signal overload prevention circuit Signal overload prevention circuit

1979-03-16

1980-12-02

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 552

Patent

active

042374901

ABSTRACT:
An overload detector is provided for generating an overload signal whenever an I.F. signal exceeds a predetermined level. The overload detector has an input coupled to the emitter circuit of a common emitter transistor of a television I.F. amplifier. When the peaks of the I.F. signal applied to the overload detector exceed the predetermined level, a transistor in the overload detector begins to operate as a class C amplifier, thereby generating a periodic overload signal. The overload signal is applied to the input of the R.F. AGC circuit of the AGC system to reduce the gain of the R.F. amplifier of the television receiver. The gain of the I.F. amplifier is not affected by the overload signal, and thus there is no degradation in the signal-to-noise performance of the I.F. amplifier.

REFERENCES:
patent: 2885473 (1959-05-01), Fraft
patent: 3301951 (1967-01-01), Humphrey
patent: 3454721 (1969-07-01), Wolff
patent: 3457366 (1969-07-01), Kerr et al.
patent: 3585294 (1971-06-01), Lewis

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