Scanning AM radio with discriminator-driven-scan-stop-circuit

Details Scanning AM radio with discriminator-driven-scan-stop-circuit Scanning AM radio with discriminator-driven-scan-stop-circuit

1983-09-07

1986-04-01

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455169, 455200, 455263, 455337, H03J 718

Patent

active

045802858

ABSTRACT:
An integrated circuit AM radio receiver includes a scan-tuner comprised of a frequency synthesizer with micro-processor controller. The tuner stops scanning when an AGC derived signal increases beyond a predetermined level indicating a strong station and additionally when another signal falls below a predetermined level indicating that the radio is accurately tuned to the station frequency. The another signal is derived from an FM discriminator simultaneously using the same coil as is employed for tuning the last AM-IF stage.

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patent: 3201696 (1965-08-01), Sharp
patent: 3628046 (1971-12-01), Bilotti
patent: 3714580 (1973-01-01), Close
patent: 3800226 (1974-03-01), Close
patent: 3967203 (1976-06-01), Lucas et al.
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patent: 4245348 (1981-01-01), Imazeki
patent: 4262363 (1981-04-01), Wiechmann et al.
Tanaka et al, New Digital Synthesizer LSI for FM/AM Receivers, IEEE Trans. on Consumer Electronics, vol. CE-27, No. 3, Aug. 1981, pp. 210-219.
Ichinose et al, One Chip AM/FM Digital Tuning System, IEEE Trans. on Consumer Electronics, vol. CE-26, Aug. 1980, pp. 282-288.

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