使用PIC单片机模拟的：450HZ低音。 -The use of PIC Single-chip simulation: 450HZ bass.

一般来说，成年男性话音的基音频率大致为50~200Hz，女性的基音频率在200~450Hz 之间,据此可以识别男女声。-In general, adult male voice pitch frequency is roughly 50 ~ 200Hz, women' s fundamental frequency between the 200 ~ 450Hz, which can identify the male and f

电脑编程计算450Hz的PCM编码，以及DTMF信号“1”的PCM编码。-Calculation of computer programming 450Hz PCM coding, and DTMF signal "1" PCM encoding.