| 摘要 |
The invention relates to the radio engineering, namely to radiocommunication and can be used for detection of signals with modulating frequency, particularly in the multichannel and differential-duplex communication systems. The pulse digital frequency discriminator includes a Schmitt trigger (1), the input of which is connected to a lead-in terminal (11) and the output û to the first input of a pulse counter (2), the second input of which is connected to the first output of a microcontroller and the output û to the input of a RS-trigger (3), the output of which is connected to the first input of a high-speed counter (4). The second and third inputs of the high-speed counter (4) are connected to the output of a reference signal generator (5) and to the second output of the microcontroller, correspondingly, and the output û to the input of the microcontroller. The third and fourth inputs of the microcontroller are connected to a digital output terminal (13) and to the input of a low-frequency filter (10), correspondingly, the output of which is connected to an analog output terminal (12).
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