If you are supporting dual tone multi - frequency dtmf telephone keypad interaction , add the dtmf support to user responses the yellow boxes by selecting the object and modifying its dtmf key property , and add the desired level of support to the catch properties 如果您想支持双音多频（ dual tone multi - frequency ， dtmf ）电话键盘交互，那么请在user responses （黄色框）中添加dtmf支持，方法是选择对象，修改它的dtmf key特性，并将希望的支持级别添加到catch特性中。
Section ii describes the design approach and implementation of speech module on mcf5249 coldfire core . the speech codec optimizes g . 729a codes and added voice activity detection of g . 729b to save bandwidth ; the implementation of acoustic echo cancellation uses nlms algorithm and it can reduce echo though designing adaptive fir filter and speech detector ; the dtmf and cpt generate signal using two second order digital sinusoidal oscillators and detect signal by picking up the frequency information . but only get the frequency information is not enough in cpt detector , this thesis introduces a method 其中对语音编解码器的设计采用优化g . 729a代码达到设计要求,并在此基础上加入g . 729b的静音检测模块,以进一步降低网络传输带宽;对回声消除器的设计采用nlms算法,通过设计自适应fir滤波器和语音检测器达到回声消除目的;对双音多频设计,信号发生端采用构造静态参数表并通过二阶正弦振荡器产生信号,信号检测端提取频率信息以检测信号;对呼叫进程音设计,除了类似双音多频的信号发生及频率检测设计外,还需要检测信号持续时间,作者设计了一种基于匹配状态表的方法以检测信号持续时间。
The speech processing module can be divided into two parts , the first part includes speech compression , voice activity detection and echo cancellation module , which improve speech quality ; the other part includes dtmf and cpt module , which generate and detect some necessary telephony signal in the communication . this thesis is organized as follows 该语音处理模块由两部分组成,一方面是对语音的处理,包括语音压缩模块、静音处理模块和回声消除模块,主要为了提高voip的语音质量;另一方面是对电话通信的控制和处理,包括双音多频模块和呼叫进程音模块,主要为了产生和检测ip电话通信中一些必须的电话信号。
