H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/89
H04B 1/10 (2006.01) H03D 3/00 (2006.01) H03G 3/34 (2006.01)
Patent
CA 1064111
ABSTRACT A digital click removal and squelch control circuit for a digital FM receiver. The digital receiver generates a series of binary number electrical signals each of which is representative of the instantaneous phase angle of a received frequency-modulated electrical signal or signal derived there- from. The phase angle signals are differentiated to produce binary number electrical signals that represent the rate of change of phase angle, or the instantaneous frequency of the received signal. During a given time interval, the phase change caused by the modulation of the received signal must be within a range determined by the bandwidth of the received frequency-modulated signal. Phase changes outside of this range represent electrical noise or clicks and are removed by the click removal circuit of the invention. If a predeter- mined number of clicks occur during a predetermined time interval, the squelch control circuit of the invention pro- vides a squelch control signal which may be used to disable the output of the FM receiver. When the click rate decreases, the output of the FM receiver is restored.
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