A Modulation and Demodulation Module for Underwater Acoustic Communication of Combined Frequency Signals
A modulation and demodulation module, underwater acoustic communication technology, applied in the modulation carrier system, carrier modulation, digital transmission system and other directions, can solve the problems of large interference, slow transmission speed, high power consumption, and reduce noise interference and manufacturing costs. Low, low power consumption effect
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[0035] The present invention is further described below with reference to the accompanying drawings, which are taken as preferred embodiments, but do not constitute a limitation to the present invention.
[0036] as attached figure 1, an underwater acoustic communication modulation and demodulation module of a combined frequency signal takes the embedded processor core control unit (1) as the main control, and the codec chip CMX865A (2) as the signal processing chip; the sending module includes a switch modulation circuit (3 ), a transmit bandpass filter circuit (4) and a power amplifier circuit (5); the receiving module includes a preamplifier circuit (7), an automatic gain circuit (8), a receive bandpass filter circuit (9), and a post-stage amplifier circuit (10), a switch demodulation circuit (11) and a low-pass filter circuit (12), the transmitting circuit and the receiving circuit are switched by a transceiver switching circuit (6) to ensure bidirectional transceiver work...
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