基于FPGA的广播电台收听检测设备设计与实现
首发时间:2018-06-15
摘要:为了解决广播电台收听率调查准确度较低且已有收听检测方法实用性差的问题,设计并实现了基于FPGA的广播电台收听检测设备。该设备首先通过数字控制振荡器(NCO)产生一个听觉上不敏感、时间较短的余弦干扰信号,通过频率调制(FM)的方式调制到广播电台的频点上,使调频收音机解调该干扰信号。同时,用声音采集电路采集调频收音机播放的声音信号。最后,采用快速傅里叶变换(FFT)技术检测是否包含干扰信号频谱,从而判断是否正在收听某电台的广播。实验表明,该设备能够自动实现对收听电台的检测。
关键词: 数字控制振荡器 频率调制 快速傅里叶变换 现场可编程门阵列 广播收听率
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Design and implementation of radio listening detection device based on FPGA
Abstract:To solve the low accuracy of radio listening rate survey and unpractical problem of listening detection, a radio listening detection device based on FPGA is designed. Firstly, the system generates a short cosine signal which sounds insensitive by the numerically controlled oscillator (NCO). Then the signal is modulated to a radio station\'s frequency through frequency modulation (FM). After the sound signals demodulated by the FM radio are collected, fast Fourier transform (FFT) technique was used to analyze whether the signals\' spectrums contain the transmitted cosine signal. By this means, it can be concluded whether the radio broadcast is listened or not. Experiments show that the system can detect the listening situation when the radio broadcast is listened.?
Keywords: numerically controlled oscillator (NCO) frequency modulation (FM) fast Fourier transform (FFT) field-programmable gate array (FPGA) radio listening rate
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