轻量化音频信号处理算法与FPGA实现
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广西师范大学电子与信息工程学院 桂林 541004

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TN912.3

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中央引导地方科技发展资金项目(桂科ZY23055007)、广西师范大学重大科技成果转化培育项目(2020PY002)资助


Lightweight audio signal processing algorithm and FPGA implementation
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College of Integrated Circuits,Guangxi Normal Univerisity,Guilin 541004,China

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    摘要:

    为了解决语音通信系统中音频信号处理的数据量大,杂散信号多,以及调频接收机在接收到的音频信号忽大忽小的问题,提出了一种轻量化音频信号处理算法,并基于此算法在现场可编程门阵列(FPGA)平台上实现了音频信号的接收与自动增益控制。该算法结合数字下变频技术、多级抽取滤波技术及自动增益控制技术(AGC),应用于音频信号处理系统中,将从上级天线接收的射频模拟信号通过模数转换以及数字下变频转换为基带音频信号,经四级抽取滤波将基带信号中的杂散信号滤除,降低了系统的复杂性和功耗,同时AGC对基带音频信号进行控制调整,输出较为稳定的音频信号。经过实验证明:该算法能够有效地将信息速率从102.4 MHz降至32 kHz、减少计算负担、提高信号质量、降低了FPGA的资源利用率;并且实现音频信号的自动增益控制调整,其调整时间仅为12.8 μs,满足接收机的功率稳定时间。

    Abstract:

    In order to solve the problem that the audio signal processing in the voice communication system has a large amount of data, a lot of stray signals, and the received audio signals of the frequency modulation receiver are large and small, a lightweight audio signal processing algorithm is proposed, and based on this algorithm, the audio signal receiving and automatic gain control are realized on the field programmable gate array(FPGA) platform. The algorithm combines digital downconversion technology, multistage extraction filtering technology and automatic gain control technology (AGC) technology, and is applied to the audio signal processing system. The RF analog signal received from the upper antenna is converted into baseband audio signal through analog-to-digital conversion and digital down-conversion, and the stray signal in the baseband signal is filtered through four-stage extraction filtering, reducing the complexity and power consumption of the system. At the same time, the digital AGC controls and adjusts the baseband audio signal to output a more stable audio signal. The experimental results show that the algorithm can effectively reduce the information rate from 102.4 MHz to 32 kHz, reduce the computation burden, improve the signal quality, and reduce the resource utilization of FPGA. And the automatic gain control adjustment of audio signal is realized, and the adjustment time is only 12.8 μs, which meets the power stability time of the receiver.

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龙彪,杨军,陈惠萍,陈光润,赵培阳.轻量化音频信号处理算法与FPGA实现[J].电子测量技术,2024,47(6):157-163

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  • 在线发布日期: 2024-06-07
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