The Design And Implementation Of Multi-Channel Voice Recording System Based On SOC

In the information age,science and technology are developing rapidly,then the technology of voice processing are also developing rapidly.And a variety of technology of voice processing and voice communications are used in various industries.Particularly,the voice recording equipment is widely used in the monitoring and security of financial,railway,electric power and other systems.However,the traditional recording system has been greatly challenged because of its large size,small storage capacity,processing speed,limited transmission distance.If the recording equipment can realize multi-channel processing and remote transmission in practical application,the performance of the traditional equipment will be greatly improved.Therefore,the design of a multi-channel voice recording transmission system has great theoretical and practical significance.In order to improve the real-time and high efficiency of voice processing,multi-channel integrated sampling chip is adopted and embedded technology is used as the system design scheme in thesis.In the design of voice acquisition,the instrument amplifier circuit and the 5-order butterworth bandpass filter are used to amplify and filter the original speech signal.At the same time,an advanced integrated sampling chip ADS8588S is used,which can sample 8-channel data at the same time and run stably.TQ2416,ARM S3C2416 for the core processor,is used as a hardware development platform.It implements high-speed digital voice signal processing,external expansion of SD card memory for mass storage,and real-time transmission via Ethernet to achieve the purpose of real-time remote transmission.The main work of the dissertation is based on the demonstration of the key speech processing technology related to this system and completed a set of voice recording system which can collect 8 signals at the same time and achieve the reliable transmission of voice files through the help of Linux system.The thesis introduces the design process and the concrete realization scheme of each function module in detail.Hardware circuit part includes the voice signal acquisition,amplification and filtering module to achieve the signal amplification of the 5V full-scale measurement and the frequency of 300Hz～3400Hz passband range.And,the software design is divided into voice processing program and network applications.Specifically,a timer is used to read data from the device in ADS8588S driver;a mono 16-bit WAV audio format is adopted for the voice coding to realize voice recording.On this basis,it can achieved Linux network server functions through the network application program,which realizes management and query of stored voice file according to the requirements of the PC client.The system mainly realizes a single voice chip processes multiple voice signals at the same time,so the performance of processing is stronger.In addition,in various practical applications,the technology of voice transmission and processing is usually universal.So the general voice transmission and processing system proposed in this paper have some reference value.