Direct modulation fm data receiver

Details Direct modulation fm data receiver Direct modulation fm data receiver

H - Electricity

04

B

325/87

H04B 1/26 (2006.01) H03D 3/00 (2006.01) H04L 27/148 (2006.01)

Patent

CA 1210072

13 ABSTRACT A direct modulation FM data receiver comprising a mixer (14) having a first input for receiving a directly modulated FM signal (fc ? .DELTA.f), where .DELTA.f is the deviation and fc the carrier, and a second input for a local oscil- lator (20) signal (fL) having a frequency within the signal channel but offset from the input signal carrier (fc) by an amount (.delta.f). Demodulating means (22 to 30) distinguish between the signalling tones (.DELTA.f + .delta.f) and (.DELTA.f - .delta. f) and derive a data output signal therefrom. The implemen- tation of the demodulating means depends upon the demodu- lation strategy. However for a strategy based on compar- ing the energies in the two signalling tones then this can be done by connecting the output of a mixer (14) to two bandpass filters (22, 24) having centre frequencies .DELTA.f + .delta.f and .DELTA.f - .delta. f. The outputs therefrom are amplitude or envelope detected in detectors (26, 28) and applied to a comparator (30) from which the data output signal is derived. Such a direct modulation FM receiver may be fabricated as an integrated circuit and is suitable for use in a paging receiver.

413779

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