FM-receiver including a frequency-locked loop

Details FM-receiver including a frequency-locked loop FM-receiver including a frequency-locked loop

1983-02-22

1985-06-11

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 4, H04H 500

Patent

active

045233284

ABSTRACT:
FM-receiver including a frequency-locked loop (2-14), which loop includes, successively connected, a voltage controlled oscillator (8), a mixer circuit (2) connected to an aerial input, an IF-portion comprising an IF-filter (9), an FM-detector (4), a loop filter (5) and a loop amplifier (6) for adjusting the transfer characteristic of the frequency locked loop (2-14), which loop amplifier (6) is connected to a control input of the voltage-controlled oscillator (8) for a feedback of the modulation signal of the received FM-signal. The loop filter (5) comprises a first low-pass filter (14). The FM-receiver being realizable in integrated circuit form and suitable for processing FM-stereo signals. The receiver is at least comparable to conventional FM-stereo receivers as regards selectivity, harmonic distortion and stability, the conventional FM-stereo receivers not being realizable in integrated circuit form. The stereo sum and the stereo difference signal are selectively and separately fedback by two simple, comparatively less selective parallel-arranged filter circuits (14; 18).

REFERENCES:
patent: 3163717 (1964-12-01), Loughlin
patent: 3466399 (1969-09-01), Dias
patent: 3798376 (1974-03-01), Limberg

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