An Adaptive Underwater Communication Method Based on Synthetic Speech Coding

Abstract

The invention relates to an integrated speech coding-based adaptive underwater communication method. The integrated speech coding-based adaptive underwater communication method comprises the following steps that: after being processed by a dual-path mixed encoder and a determining device, speech inputted by an information source end of a hydro-acoustic communication system is transmitted out through a channel encoder, a modulator, a power amplifier and a hydro-acoustic transducer; after the speech is transmitted by a hydro-acoustic channel, an information sink end receives signals through an underwater acoustic transducer, and then, the signals are transmitted to a dual-path mixed decoder after the signals are subjected to amplification of a filter amplifier, channel equalization, channel estimation, demodulation and channel decoding; before speech-coding and speech-recognition hydro-acoustic communication, a group of training codes is transmitted by a determining device of an information source end of an underwater worker A, and the training codes arrive at an information sink end of an underwater worker B through a channel; after processing obtained channel characteristics, the information sink end of the underwater worker B forwards results to an information source end of the underwater worker B, and the results arrives at an information sink end of the underwater worker A through a channel, and the determining device of the underwater worker A performs judgment according to received channel characteristic parameters. With the integrated speech coding-based adaptive underwater communication method adopted, speech communication quality comparable to mobile communication can be realized.

Description

technical field [0001] The invention belongs to a voice communication system. In particular, it relates to an adaptive underwater communication method based on integrated speech coding. Background technique [0002] All underwater acoustic communication methods are generally divided into two types: analog and digital. Among them, the analog communication method is mostly based on single-sideband amplitude modulation modulation. When the channel is strictly band-limited, the analog communication method can usually meet the bandwidth requirements of voice communication. , but the quality of the analog communication method is poor, the voice clarity is up and down, and it cannot adapt to complex and changeable bad channels. Generally, oceanic channels have the characteristics of high noise background, low carrier frequency, extremely limited bandwidth, and time-space-frequency variation, which make underwater acoustic channels one of the worst communication channels so far. M...

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Problems solved by technology

Use speech synthesis algorithm to synthesize pronunciation into speech signal output; Literature "Speech Recognition and Synthesis Technology Application in Underwater Acoustic Communication", Proceedings of the 2003 Communication Theory and Signal Processing Annual Conference, March 2008, P434~439, Cheng En et al., the idea is to convert voice signals into text signals, and use the ready-made ViaVoice recognition software and speech synthesis software to realize underwater voice communication. The synthesis method is not specified, and it is not suitable for voice communication between underwater micro-carriers and underwater workers

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