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ＤＴＭＦ是音频电话中的拨号信号，广泛运用于电话信息查询系统、电子邮件系统等交互式的控制应用中。介绍了基于ＡＤＳＰ２１ｘｘ系列ＤＳＰ芯片的ＤＴＭＦ软件检测方法，解决了采用专用芯片所带来的不足之处，使得ＤＴＭＦ检测变为迅速、灵活和准确。
DTMF is a dial tone signal in audio telephones and is widely used in interactive control applications such as telephone information inquiry system and e-mail system. This paper introduces the testing method of DTMF software based on ADSP21xx series DSP chip, which solves the shortcomings caused by the use of special chips, and makes the detection of DTMF fast, flexible and accurate.