Method for encrypting voice to transmit in PSTN network
A voice and encrypted technology, applied in the field of secure communication, can solve the problems of long time, inconvenient use, increased cost and difficulty in debugging, etc., and achieves the effect of convenient application, improved usability, and easy promotion.
Inactive Publication Date: 2010-06-30
成都三零瑞通移动通信有限公司
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Problems solved by technology
One of the disadvantages of this method is that the MODEM chip and peripheral circuits are required, which increases the cost and the difficulty of debugging; another obvious disadvantage is that the time for the MODEM chip to establish a data channel is too long, generally more than 18 seconds, which is difficult for users to use. extremely inconvenient
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[0037] The present invention is described in detail below in conjunction with accompanying drawing:
[0038] Such as image 3 As shown, the A / D converter used in this method adopts TLV320AIC11, the vocoder used adopts AMBE2000, the CPU used adopts TMS320C5510, and the whole machine software adopts c language.
[0039] The method that encrypted voice of the present invention transmits in PSTN network, step is as follows:
[0040] 1. At the sending end:
[0041] 1. First, convert the analog voice signal into 128Kbps PCM data through A / D conversion;
[0042] 2. Compress and encode the 128Kbps PCM data into 2400bps vocoder data through the vocoder;
[0043] 3. Encrypt the 2400bps vocoder data and increase the transmission message key by the CPU;
[0044] 4. Perform error correction coding on the encrypted 2400bps voice code data and message key through the CPU;
[0045] 5. Through the CPU, the encrypted 2400bps voice code data, message key and error correction code are modula...
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The invention discloses a method for encrypting voice to transmit in a PSTN network, comprising the steps that: at a transmitting end, the analog voice is processed by A / D conversion, then PCM data is compressed and coded by a vocoder, the coded data is encrypted, a message key is added, the coded data and the massage key are corrected and coded, the encrypted coded data, the massage key and error correction of coding are modulated into data similar to the voice, and the obtained data is transmitted on the PSTN network after D / A conversion; and at a receiving end, a signal is treated by A / D conversion, demodulated, corrected and decrypted, is then decoded by the vocoder and is treated by D / A conversion, and a simulated voice signal is output. The invention has the outstanding advantages of: breaking through the technical bottleneck that encrypted voice data can not be correctly restored into the voice data at the receiving end after being transmitted by the PSTN network, and guaranteeing the quality of encrypted voice by correcting the error code generated in the processes of modulation and transmission. The method does not need a MODEM chip and a peripheral circuit, and realizes the transmission of the encrypted voice in the PSTN network.
Description
technical field [0001] The invention relates to the technical field of secure communication, in particular to a method for transmitting encrypted voice data on a PSTN network. Background technique [0002] There is currently only one way to transmit encrypted voice in PSTN network, that is, after the dial-up is successful, start the MODEM chip to establish an end-to-end data channel. After the data channel is established, the encrypted voice data can start to be transmitted. One of the disadvantages of this method is that the MODEM chip and peripheral circuits are required, which increases the cost and the difficulty of debugging; another obvious disadvantage is that the time for the MODEM chip to establish a data channel is too long, generally more than 18 seconds, which is difficult for users to use. Extremely inconvenient. Contents of the invention [0003] The purpose of the present invention is to provide a method for transmitting encrypted voice in the PSTN network....
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IPC IPC(8): H04M1/68H04L9/00H04K1/02
Inventor 梁鸿斌
Owner 成都三零瑞通移动通信有限公司