Abstract: There is provided a detector for extracting binary data frequency-modulated on a carrier signal. An axes generator produces M pairs of logic signals, the logic signals of the same pair being in quadrature. The decoder includes M asynchronous logic zero-crossing detectors producing first pulses and second pulses. An up-counter/down-counter has first, second and third values, and when it has the second value, passing to the first value during a first pulse, and passing to the third value during a second pulse, and a binary decoder generates binary data whose state is not modified when the up-counter/down-counter passes from the first value to the second value or from the third value to the second value. No external time base is required and the decoder has a reduced bit error ratio.

Abstract: There is provided a detector for extracting binary data frequency-modulated on a carrier signal. An axes generator produces M pairs of logic signals, the logic signals of the same pair being in quadrature. The decoder includes M asynchronous logic zero-crossing detectors producing first pulses and second pulses. An up-counter/down-counter has first, second and third values, and when it has the second value, passing to the first value during a first pulse, and passing to the third value during a second pulse, and a binary decoder generates binary data whose state is not modified when the up-counter/down-counter passes from the first value to the second value or from the third value to the second value. No external time base is required and the decoder has a reduced bit error ratio.