【摘要】 双音多频(DTMF)信令是电信系统的一个标准。比较了FFT,Goertzel等DTMF信号软件解码算法,对算法原理作了分析,给出了实验结果。提出一种分带非归一化离散傅立叶变换(SB_NDFT)解码的改进方案,在满足信号解码要求情况下,降低了算法复杂度。更多还原

【Abstract】 DTMF(Dual Tone Multi-frequency) are recommendations of ITU(International Telecommunications Union). This article compared the DTMF software decoding based on FFT and Goertzel algorithm both in theory and experiment. The key innovation is the use of SB_NDFT(Subband Nonuniform Discrete Fourier Transform), which satisfies the ITU recommendations and has lower computing complexity.更多还原