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对讲机通信中,一般使用亚音频信号(CTCSS)作为识别信号,判断是否对接收到的信号进行解码。提出了Goertzel算法在对讲机的亚音频提取的应用。Goertzel是一种特殊的离散傅里叶变换的方法,对于检测单频率有很好的效果。大幅度降低了亚音频提取的计算量,通过降低算法开销来降低整个系统的成本。相对于传统的使用独立IC识别或者傅里叶变换法,本方法有很大的优势,在生产中得到良好的应用。
Walkie-talkie communications, the general use of sub-audio signal (CTCSS) as the identification signal to determine whether the received signal decoding. The application of Goertzel algorithm in sub-audio extraction of walkie-talkie is proposed. Goertzel is a special method of discrete Fourier transform that works well for single-frequency detection. Substantial reduction in sub-audio extraction of the amount of computation, by reducing the cost of the algorithm to reduce the cost of the entire system. Compared with the traditional method of using independent IC identification or Fourier transform, the method has great advantages and is well applied in production.