FM Counter detector

Details FM Counter detector FM Counter detector

1981-08-31

1983-07-26

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 23, H04N 562

Patent

active

043957358

ABSTRACT:
A counter-type detector system is provided for a television receiver in which a standard angle modulated intermediate frequency signal is heterodyned to a lower frequency prior to detection by the counter detector. The lower intermediate frequency permits the generation of a pulse signal which is averaged to produce a relatively high level detected output signal. After the angle modulated intermediate frequency signal has been converted to the lower frequency, additional selectivity may be used prior to detection to further attenuate signal frequencies above the lower carrier frequency.

REFERENCES:
patent: 2750441 (1956-06-01), Schlesinger
patent: 3399353 (1968-08-01), Avins
Television Sound Signal Recovery Circuit, Freedman, Dec. 1964, RCA Technical Notes, RCA TN No. 593.
A New Counting Pulse Demodulator for SECAM TV Standard Using TTL Circuits, Hajos, L'Onde Electronique, vol. 56, No. 4, pp. 200-203, Apr. 1976.
Frequency Modulation Engineering by C. E. Tibbs, Pub. 1947, pp. 234-235.
RCA Datebook on "Linear Integrated Circuits", (1978), p. 348.
Instruction Manual for Tektronix Television Demodulator 1450, Printed Jul. 1979, Audio Section Schematic.

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