Process and device for speech scrambling and unscrambling in speech transmission

(-- 57) summary -- the process about this invention is changed into double 素信号 in which the digitized actual voice signal receives the sampling reduction which has the bandwidth of the double 素 filter preferably matched with a sampling rate using the Hilbert filter processing of double 素. In this way, the phase modulation of the generated double 素信号 is carried out using the code signal generated by the random number generator, it is additively combined with the pilot signal by which the phase modulation was carried out in a similar manner probabilistically, and forms the valid signal which can be transmitted and by which scrambling was carried out. This valid signal is sequentially transmitted with the preamble used for the equalization of a receiver end synchronization and a valid signal. Since the clock synchronizer for the pilot signal which is generated in a receiver end after double 素 filtering in a preamble recognition stage and sampling reduction of correspondence and by which the phase modulation was carried out is again produced in a receiver end, The digitized received signal is made, an equalization modulus is calculated for a receiver end equalizer (51), and initial setting of the stage of a valid signal restoration stage is carried out there. The transmitted valid signal by which scrambling was carried out, Dissociate from the phase modulation pilot signal piled up at the transmitting side by being combined with the synchronizing pilot signal which was generated in the receiver end, and it ranks second, The digital sound signal which was produced as a result, with which the phase was modulated and by which scrambling was carried out is restored by solving mixing using the code signal which is generated in a receiver end and in which clock control is carried out by the preamble.