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Voice-like data transmission method based on hybrid modulation

A voice data and transmission method technology, applied in voice analysis, instruments, etc., can solve the problems that modems cannot be directly applied, digital signals cannot transform voice signals, etc., and achieves fast framing and de-framing speed and small modulation and demodulation delay. Effect

Active Publication Date: 2021-08-17
SOUTHEAST UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of voice-like data transmission method based on hybrid modulation, to solve the problem that the existing modem cannot be directly applied to the channel using the voice codec, and the digital signal cannot be converted into a voice signal with certain time-frequency characteristics question

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  • Voice-like data transmission method based on hybrid modulation
  • Voice-like data transmission method based on hybrid modulation
  • Voice-like data transmission method based on hybrid modulation

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Embodiment Construction

[0029] In order to better understand the purpose, structure and function of the present invention, a mixed modulation-based voice-like data transmission method of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] Such as figure 1 As shown, it is a schematic diagram of the overall flow of a kind of voice-like data transmission method based on mixed modulation proposed by the present invention, and the method specifically includes the following steps:

[0031] Step 1. Serial-to-parallel conversion: Perform serial-to-parallel conversion on the input low-speed data stream to obtain n segments of fixed-length segmented data stream {d 1,1 , d 1,2 ,...,d 1,k ;d 2,1 , d 2,2 ,...,d 2,k ;...;d n,1 , d n,2 ,...,d n,k}, the amount of bits that each section of data stream contains is represented by k, k=30 bits;

[0032] Step 2, frequency band division: select the optimal transmission bandwidth [f of the vocoder...

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Abstract

The invention discloses a voice-like data transmission method based on hybrid modulation, and the method comprises the following steps: carrying out the serial-to-parallel conversion of an input data stream, and obtaining a segmented data stream with a fixed length; dividing frequency bands within the optimal transmission bandwidth of a vocoder voice channel, adopting different modulation modes for different frequency bands so as to achieve the minimum transmission error rate, wherein the error rate of each frequency band is the same; obtaining a data symbol through inverse fast Fourier transform; framing the blank symbol, the synchronization header symbol and the data symbol together to obtain a voice-like signal frame; and receiving the voice-like signal frame at a receiving end and demodulating the voice-like signal frame to obtain a data stream. According to the invention, data can be modulated on amplitude or phase parameters of a plurality of frequency points of frequency bands, voice-like signals are generated, and thevoice-like signals has time-frequency characteristics of common voice, can be transmitted through a voice channel with a vocoder, and can be widely applied to secret communication of end-to-end voice channels.

Description

technical field [0001] The invention belongs to the technical field of designing quasi-speech modulation, in particular to a method for transmitting quasi-speech data based on mixed modulation. Background technique [0002] Voice communication is an indispensable way of daily information exchange, and eavesdropping on mobile phones and telephones occurs from time to time. After the mobile phone is installed with a Trojan horse, it is easy to eavesdrop on the user's call through the wireless network; the monitoring of the telephone voice can be achieved by combining the telephone lines. The VoIP service that has appeared in recent years can achieve a certain degree of secure transmission through IP packet encryption, but the voice is still in plain text in the IP packet, which cannot achieve end-to-end secure transmission. Therefore, if the voice can be encrypted before voice transmission, then the leakage of voice information caused by eavesdropping by a third party during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/18G10L19/20
CPCG10L19/18G10L19/20
Inventor 胡爱群董冰书张镇
Owner SOUTHEAST UNIV