H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/73
H04B 1/26 (2006.01) H03D 3/00 (2006.01) H04B 1/16 (2006.01)
Patent
CA 1208701
16 ABSTRACT: FM-receiver including a frequency-locked loop. 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 arrange- ment (5) and a loop amplifier (6) for adjusting the trans- fer 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, which loop filter arrangement (5) comprises a first low-pass filter (14), the FM-receiver being realizable in integrated circuit form and suitable for processing FM-stereo signals. So as to ensure that for the processing of FM-stereo signals the receiver is at least comparable to conventional FM- stereo receivers as regards selectivity, harmonic distortion and stability which conventional FM-stereo receivers are not realizable in integrated circuit form, the stereo sum and the stereo difference signal being selectively and separately fedback via two simple, comparatively weakly selective parallel-arranged filter circuits (14; 18).
422773
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
LandOfFree
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