Voice encryption and decryption method
A voice encryption and voice technology, applied in voice analysis, digital transmission systems, instruments, etc., can solve the problems of large influence of circuit noise and device parameters, and long product cycle of hardware design and realization, achieving less resources and overcoming long research and development cycle. , the effect of simple steps
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[0034] Below in conjunction with accompanying drawing and example the present invention is described in further detail.
[0035] Such as figure 1 Shown, voice encryption method of the present invention comprises the following steps:
[0036] (1) Transform the digital voice signal from the time domain to the frequency domain according to the length of the set segment; specifically, according to the standard of mobile communication, the digital voice signal A collected in the existing mobile communication network (including 2G and 3G network), 20ms is used as a unit frame (assumed to be A'), and the sampling frequency is 8KHz for transmission. Each frame is compressed according to the Linear Prediction Coding (LPC) algorithm, and the compression Afterwards, 160 sampling points are obtained; according to a specific sampling length (here, 160 points), the Fourier transform from the time domain to the transform domain is performed on these points; that is, a discrete Fourier trans...
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