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Dual frequency demodulation apparatus for frequency shift keyed (FSK) data signals and FM signals and method therefor
Dual frequency demodulation apparatus for frequency shift keyed (FSK) data signals and FM signals and method therefor
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机译：用于频移键控（fsk）数据信号和FM信号的双频解调设备及其方法
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摘要
The present invention provides an apparatus and method for dual frequency demodulation of frequency shift keyed data signals and linear FM signals. A carrier frequency and first and second side bands are divided and multiplied by first and second local oscillators having different frequencies above and below the carrier frequency. The first oscillator frequency Fx1 is between the lower range F0 of the signal and the carrier frequency FC, and the second oscillator frequency Fx2 is provided between the upper range F1 of the signal and the carrier frequency FC, wherein F0 Fx1 FC Fx2 F1. The multiplied divided signals are filtered and amplified and converted to either digital data prior to being read by a digital reader, such as a comparator or a conventional differential operational amplifier or linear signals by demodulating FM signals. The invention eliminates the need for intermediate frequency bandpass filters, and uses only low pass filters which can be incorporated into a monolithic integrated circuit as provided by the present invention.
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