H - Electricity – 03 – K
Patent
H - Electricity
03
K
329/5
H03K 9/06 (2006.01) H04L 27/156 (2006.01)
Patent
CA 1161130
ABSTRACT OF THE DISCLOSURE A demodulator has a timer which counts clock pulses to provide a reference time interval of predetermined length starting with the rising flank of each pulse of frequency modulated data signal. The difference between the reference time interval and the length of pulse depends on the frequency of the data signal and hence can provide a demodulated (binary) signal. Frequency deviation in the incoming data signal tends to cause distortion of the demodu- lated signal. To correct such distortion the demodulated signal is compared with a reference signal of double the frequency of the demodulated signal and a first counting stage driven up or down depending on the comparison result. A decoder checks the count of the first counting stage at predetermined intervals and drives a second counting stage up or down depending on the decoder result being above or below a predetermined threshold count. The second counting stage supplies regulating signals to the timer, e.g. to vary the starting count of the timer, to adjust the reference time interval to compensate for the frequency deviation and hence correct the distortion in the demodulated signal.
342278
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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