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The directional loudspeaker systems research of FPGA - based audio

Author: XiongDaoYun
Tutor: XuLiMei
School: University of Electronic Science and Technology
Course: Pattern Recognition and Intelligent Systems
Keywords: Audio directional FPGA Verilog
CLC: TN643
Type: Master's thesis
Year: 2011
Downloads: 55
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Abstract


Acoustic directional loudspeaker is also referred to as a parametric speaker , using the nonlinear interaction of the ultrasound in the air directional transmission of sound . The two ultrasonic airborne , self- demodulation and frequency and difference frequency signal , high-frequency sound signal attenuation ear to hear the difference frequency signal that can be in the air soon . Audio directional technology one of the priorities is the implementation of the method of signal processing , and signal processing methods require hardware platform support . Hardware platform DSP and FPGA platforms . An FPGA is a field programmable logic chip, the characteristics of the pass directly programmed on the chip to achieve a variety of circuit functions , without having to design a dedicated circuit , can speed up the cycle of the circuit design , reduce costs , and its parallel processing in the high-speed data processing areas can play an important role . The goal of this article is The application field programmable logic chip FPGA (Field Programmable Gate Array) and the peripheral circuit composed of an audio signal processing circuit, a digital signal processing audio directional . The audio directional signal processing methods are developed based on the theory of parametric array , the paper describes the theoretical source of parametric array ultrasonic directional and non-linear airborne . Then analyzes the digital signal processing algorithms for audio directional technology , audio directional signal processing algorithms bilateral with ( DSB ) , single sideband (SSB), the square root method and dual integrated open method , the analysis of these types of the process of implementation of the method and simulation in MATLAB application Verilog language in the ISE development environment to achieve a double-sideband , single-sideband modulation . The final design of FPGA hardware digital signal processing platform , implemented in FPGA hardware platform DSB modulation , SSB modulation compared these two modulated sound pressure levels and harmonic distortion . Through these two signal processing methods to achieve the results were compared and found SSB in SPL and harmonic distortion than the double sideband modulation has an advantage, under the same conditions , the SPL of the single sideband modulation is high , and harmonic distortion is smaller, application single sideband signal processing method described in the audio directional system can bring the better results .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Electronic components, assemblies > Electro-acoustic devices > Speaker
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