If you’ve ever wondered about the best way to detect dial and DTMF tones from a phone line, [Debraj] is your man. [Debraj] built a DTMF detector using the Goertzel algorithm. Normally, when we think ...

In the early 1960s, AT&T introduced a method of providing in-band signaling so telephone customers could place telephone calls. The system was called dual-tone multi-frequency, or DTMF. AT&T, through ...

DTMF (Dual Tone Multi Frequency) is a signaling system for identifying the keys or better say the number dialed on a pushbutton or DTMF keypad. DTMF (Dual Tone Multi Frequency) is a signaling system ...

The DTMF extension project is intended to detect DTMF tones and decodes them to binary digits that can be easily read by a microcontroller which can decide what jobs to perform. The DTMF extension ...

Just got a new Galaxy S5. So far I'm loving the phone, with one fairly major annoyance - what the hell were they thinking when they used some bubble sound for the keypad tones? Is there any way to get ...

We’ve seen reports this evening that Samsung might be causing issues with the latest software updates to older handsets. On Twitter this evening, we were alerted to an issue with DTMF tone dialing ...

Two critical elements of traditional telephony will have to be supported in the new voice-on-the-Web technology. I was at a conference without my cell phone, and I wanted to access my voice mail ...

Scienceprog has posted how-to build a DTMF tone detector. DTMF are the standard sounds used in tone dialing. Plugging this circuit into your phone line you can decode the all the tones on the line ...

A practical look at Dual Tone Multi Frequency and RFC 2833/4733 It's easy to get lost in the technological babble of our industry. We are awash in acronyms, product names, standards (real and pseudo), ...