Carrier detector apparatus useful in a multiband sweep type tuni

Details Carrier detector apparatus useful in a multiband sweep type tuni Carrier detector apparatus useful in a multiband sweep type tuni

1981-09-25

1983-06-07

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581951, 455164, H04N 544, H03J 702

Patent

active

043874010

ABSTRACT:
In a sweep type tuning system capable of sweeping through a desired range of carrier frequencies selectively in one of two directions, a carrier detector includes a discriminator for generating a discriminator signal as the frequency range is swept which has a first amplitude portion when the frequency of a tuned carrier is less than a predetermined nominal value and a second amplitude portion when the frequency of the tuned carrier is greater than the predetermined nominal value. A sequence detector determines the sequence of generation of the first and second portions of the discriminator signal to generate a signal indicating the presence of the tuned carrier. The presence indicating signal is generated when the sweeping takes place in a first direction if the first and then the second portions are sequentially generated and when the sweeping takes place in the second direction if the second and then first portion are sequentially generated.

REFERENCES:
patent: 3936753 (1976-02-01), Clark
patent: 4214274 (1980-07-01), Rzeszewski et al.
patent: 4217552 (1980-08-01), Mogi et al.
patent: 4302778 (1981-11-01), Tanaka
SGS/ATES Data Sheets for the M193 and TDA4430 Integrated Circuits.
"A Microcomputer-Controlled Frequency Synthesizer for T.V." by Rzeszewski et al., IEEE Transactions on Consumer Electronics, May 1978, vol. CE-24, No. 2, pp. 145-154.

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