Method and device for speech encryption and decryption in voice transmission

摘要: A digitized real voice signal is converted via complex filtering into a that subjected to sampling rate reduction, the bandwidth of respective filter corresponding rate. The phase-modulated by means code generated random-number generator and additively combined with pilot (likewise in random distribution) form an encrypted useful for transmission. sequentially transmitted together preamble synchronization equalization at receiver end. At end, clock forced produced end equalizer coefficients are calculated from received after during recognition phase, which point phase decryption initialized. encrypted, separated its signal, superimposed transmitter linking synchronized phase-modulated, digital speech thus obtained subsequently decomposed receiving clockcontrolled preamble.