Application Of Objective Evaluation Technology In Underwater Voice Communication

High-quality underwater speech communication technology can provide scientists and engineers with efficient and high-quality services.In underwater operations,marine exploration,and even underwater rescue,speech communications have a wide range of applications.However,in order to achieve higher quality underwater speech transmission,in addition to requiring a low bit error rate during communication,the speech signal itself also requires higher intelligibility and a better hearing experience,and these subjective feelings cannot be achieved.Quantitative research,therefore need to use objective evaluation criteria,objective quantitative analysis of the communication quality of underwater speech signals,the method of calculating the evaluation score is more intuitive and convenient,and based on this,to optimize the underwater speech communication In order to solve the optimization problem,this article starts from two ideas: First,retransmitting important data transmitted at the transmitting end to prevent the occurrence of bit errors in the transmission of important data leads to degradation of decoded voice quality;secondly,at the receiving end,speech-enhanced signals have already been communicated to improve quality and feel at the voice level.First of all,this paper mainly introduces the principle of PESQ objective evaluation criteria,and focuses on the detailed implementation steps of PESQ algorithm.Through analysis,it is found that the algorithm uses auditory perception as a model,which makes the PESQ algorithm closest to the subjective subjective audition of the human ear.At 0.98,basically,the higher the score,the better the voice quality and the better the listening experience.Therefore,this algorithm can excellently complete the task of evaluating the quality of underwater speech communication,laying the foundation for subsequent optimization.Then,the software editor function used in the CCS compilation environment is simulated to introduce the characteristics of the TMS320C6748 model DSP,the kernel and peripheral interfaces,and the reasons for selecting the device.Then the compile environment of the CCS software is introduced.Next,the PESQ is introduced.The porting and optimization of the algorithm will increase the speed of operation and will provide the basis for subsequent system development and other work.Secondly,the speech coding algorithm adopted in this paper is introduced,and the bit distribution and transmission sequence of the encoded parameters are clearly defined,which is the theoretical basis for underwater speech communication optimization.The main simulation method is to add random errors to the specified parameters or bits.Code,which simulates the error caused by the underwater acoustic channel during underwater acoustic communication,and then performs the PESQ objective evaluation score on the decoded synthesized speech,and gets the most sensitive to the error code according to the score level,which is the most important parameter for speech coding.The bit of bits is called a specific bit.Next,the method of retransmission protection for specific bits is used as an optimization strategy.Two optimization strategies,uniform protection and non-uniform protection,are proposed,and simulation experiments and field experiments are performed.Experiments show that the effectiveness of voice communications has improved.Finally,the optimization strategy at the receiving end mainly adopts two methods: spectrum subtraction and wavelet packet denoising algorithm,and the PESQ score of the processed received speech signal is obviously improved.