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

Inactive Publication Date: 2012-08-01
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, this method requires the design of a new modem, and the hardware design has a long product cycle, which is greatly affected by circuit noise and device parameters; more importantly, this method can only resist the PRE-LTP coding standard used in 2G

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Embodiment Construction

[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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Abstract

The invention discloses a voice encryption method, which includes the following steps that digital voice signals are varied from a time domain to a frequency domain according to set length in sectional mode, varied voice signals are encrypted according to a secret key, performing conversion from a transformation domain to the time domain on encrypted voice signals, and encrypted time domain signals are obtained. The voice encryption method can guarantee safety of a mobile communication system and can confront effects of encoding problems in 2G and 3G standard on the secret key well. The invention further discloses a voice decryption method.

Description

Technical field: [0001] The invention relates to a voice encryption technology in the field of mobile communication, in particular to a voice encryption and decryption method. Background technique: [0002] In recent years, with the rapid development of mobile communication technology, the performance and functions of communication networks have also been significantly improved. The public mobile communication network has experienced the first generation mobile communication network (1G) using analog voice channels, the second generation mobile communication network (2G) using digital channels, and the third generation mobile communication network that can provide the highest 2Mbit / S data communication rate. Communication network (3G), and is moving towards the fourth generation mobile communication network (4G). [0003] With the introduction and popularization of data transmission methods, mobile communication networks can also provide various types of services, and while...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00H04W12/02G10L19/00
Inventor 胡汉平王祖喜金堃罗丹苏德庭于志良徐竞
Owner HUAZHONG UNIV OF SCI & TECH
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