Design And Implementation Of FPGA-based Audio Signal Processing

Language is human communication of information between the most convenience, the most visible, one of the best tools effect, and audio signal is carried language information audio fluctuations. For audio signal processing in main using digital signal processing technology, can more flexible, convenient to realize complex signal processing, and high accuracy, good stability.Now, based on DSP technology of signal processing technology, the communication technology and the multimedia technology is developing rapidly, DSP technology in these aspects is widely. But for household speech implementation scheme or a portable needs of speech processing products, based on DSP technology design scheme will not apply. First DSP chip cost is relatively high, far more than batch production; ASIC chip Second requirement portable devices usually require volume to do as small as possible, power consumption to do as low as possible. But one of the advantages of ASIC chip is small volume, low power consumption.At present, to the Field reprogrammable Array FPGA (Field Programmable Gate Array) device as a representative of the ASIC device developing rapidly, device system integration and speed are in high growth, in many areas have been widely, this is mainly thanks to the development of digital processing technology is developing rapidly. Both gate array (FPGA device logic higher density and reliability good advantages and have programmable logic device user programmable sex, can reduce the system design difficulty and maintenance costs, effectively control product overall cost, shorten design time.This paper puts forward a method based on FPGA device of audio signal processing, this paper discusses the implementation scheme of the voice signal collection, processing and application. Voice signal acquisition of FPGA system D/A transformation, and voice filtering, audio output was studied, the content such as the key work of the noise environment is how can effectively put need voice signal extracted from open, eliminate or attenuation noise, this involves the design of filter, through digital filter to handle noise signal. Secondly because acquisition to audio data has a huge data quantity, if not processed, save they need lots of storage space, transmission up also compares difficulty, need to signal compression, this paper also discussed the audio signal encoding, compression scheme selection.The research process through the simulation test and system hardware design, and finally achieve the desired goals.