While many of us have banished land line telephones from our houses, there are still quite a few people who utilize POTS lines today. These analog phone systems use Dual Tone Multi Frequency (DTMF) ...

DTMF是语音通信系统中人机交互的必要手段。用户通过系统提示音输入相应的选项按键来进行下一步的呼叫流程执行。Asterisk中的DTMF也扮演着这样的角色，用户输入按键，asterisk通过dtmf来获得相应的执行流程。典型的应用场景就是IVR或语音导航。很多用户不清楚 ...

The objective of the project is to decode dual tone codes into digits which are later interpreted by microcontroller. This device is very useful for decoding Dual Tone Multi Frequency (DTMF) generated ...

For a hobby that’s ostensibly all about reaching out to touch someone, ham radio can often be a lonely activity. Lots of hams build and experiment with radio gear much more than they’re actually on ...

Winston-Salem, NC&#8212CML Microcircuits' CMX867A, a V.22 multi-standard modem IC for telephone-based information systems, includes an enhanced DTMF decoder, thus affording a more compact design and ...