| 摘要 |
<p>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).</p> |
