Automatic IF tangent lock control circuit

Details Automatic IF tangent lock control circuit Automatic IF tangent lock control circuit

1988-08-15

1989-10-03

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

381 15, H04H 500

Patent

active

048722073

ABSTRACT:
An improved radio receiver that maintains a stable predetermined IF frequency upon receipt of input carrier signals of differing frequencies. The IF signal (14) is processed through a signal demodulation unit (16) that includes a tangent processing unit (22) to yield a control signal that varies as a tangent function of both the demodulated IF signal and a reference signal from a reference oscillator (17). This control signal is used to control the frequency and phase of a reference signal (26) used by the IF stage (12) to center the IF signal with respect to the IF stage characteristics.

REFERENCES:
patent: 4282401 (1981-08-01), Takahashi
patent: 4419541 (1983-12-01), Kishi et al.
patent: 4449230 (1984-05-01), Yokoya
patent: 4606048 (1986-08-01), Sasaki et al.
"Laboratory Comparison of Tanlock and Phaselock Receivers", by J. Balodis as published in the Proceedings of the National Telemetry Conference Paper 5-4, (1964).
Book entitled "Detection, Estimation, and Modulation Theory", in part II entitled Nonlinear Modulation theory, by Harry L. Van Trees and published by John Wiley and Sons, Inc., (1971), at p. 34.
Specification sheet for the MC13020P Motorola C-QUAM (Registered Trademark) AM Stereo Decoder.

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