pdt walkie talkie with integrated ais codec capability
A walkie-talkie, codec technology, applied in the transmission modification based on link quality, two-party line system station, digital transmission system, etc., can solve the problems of poor portability, volume, power consumption disadvantages, etc., and achieve easy call for help , improve portability, improve the effect of standby time
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[0032] The present invention will be further described below in conjunction with drawings and embodiments.
[0033] Such as figure 1 As shown, the equipment hardware is composed of antenna, channel machine unit, baseband unit and display unit; the antenna is used to receive and transmit radio frequency signals, the channel machine has high-speed sampling capability, processes radio frequency signals into baseband signals, and the baseband unit stores high-speed sampling The waveform characteristics of the synchronization word of the AIS mode message and the PDT mode message and the pre-distortion algorithm for the channel machine, the same channel machine can send and receive GMSK modulated messages in AIS mode and 4FSK modulated messages in PDT mode; typical example is 96KHz sampling rate The IQ signal is also responsible for modulating the baseband signal of the transmission path to the carrier to generate a radio frequency signal. The baseband unit is used for signal proce...
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