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Design of High-speed Audio Acquisition System Based on DSP

Author: ZhuChaoWen
Tutor: ZengShuiPing
School: North China University of
Course: Control Theory and Control Engineering
Keywords: DSP Audio capture and processing CPLD Digital filtering
CLC: TP274.2
Type: Master's thesis
Year: 2010
Downloads: 298
Quote: 2
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Abstract


In our daily lives, and a variety of industrial processes, the audio signal is widespread and has the stability, accuracy and real-time characteristics. Various types of data acquisition in the industrial field, real-time monitoring of the audio signal has its unique advantages. In this thesis, the DSP as the core processor is designed and implemented a set of audio capture and processing system, and discusses in detail the composition of its hardware and software systems, development and implementation of specific programs. In the system hardware design, discusses the overall design of the system hardware, the overall architecture, constitute the entire system of the module circuit realization and production of printed circuit boards. The main circuit of the module include DSP minimum system circuit module, A / D and D / A conversion, audio capture and transmission module, expanded external memory module, CPLD the timing logic control module and the DSP and the host computer's serial port communication module. DSP minimum system circuit module is to guarantee the normal and orderly work of the DSP system. The A / D and D / A conversion of the audio capture and transmission module is mainly achieved between the transfer and exchange of the sensor to the analog audio signal and a digital signal of the DSP processing. The expansion of the role of the external memory for DSP processing a large number of digital signals to provide a broader program space and data space to improve the efficiency of the implementation of the system and to reduce the processing time. Digital timing logic control CPLD sequential logic control module for external expansion memory and DSP core processor systems provide between normal reading and writing. DSP and PC serial communication module communication between the DSP signal processing with PC. Part in the development of system software, mainly discusses the corresponding hardware circuit module supporting software module program, including the main program audio capture module of A / D and D / A conversion, infinite impulse response (IIR) digital filter design and program and system serial communication with the host computer program. IIR digital filter design and implementation of some of the major expounded the basic principle and design of the DSP chip low-pass and high-pass filter, and compare the results of this system and processing. Papers in the final details of the system module and the main chip debugging of hardware and software debugging process debugging results show that the system fully realize the real-time analog audio signal acquisition, digital filtering, processing, and communication with the host computer. function, the system has a powerful audio capture and processing capacity, and therefore can be used as the design, research, and a common platform for the acquisition and processing of audio signals.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system > Data collection and processing systems
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