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DTMF Recognition – SmartPTT Technical Support Center
https://support.smartptt.com/hc/en-us/articles/200002082-DTMF-Recognition
A DTMF signal consists of the sum of two sinusoidal waves, frequencies of which correspond to the numerals of dialed number. In case of Control Station usage, possibility to recognize DTMF tones depends on quality of the audio channel and quality of the sound card. Verification of DTMF recognition: 1. Audio file recording (with DTMF tones) 1.1 ...
Detect DTMF Tones - DialABC
http://www.dialabc.com/sound/detect/
Detect DTMF Tones. DialABC lets you find DTMF tones within audio clips. All you have to do is to upload an audio file to the dialabc web site using the form below. Our software then analyzes the audio recording and presents you …
DTMF issues and problems when using VoIP.
https://www.voipmechanic.com/dtmf-issues.htm
The switch has to detect and remove the tone sent by the ATA from the audio stream because the upstream provider specified RFC2833 DTMF. At times the switch can't always completely remove the in-band DTMF tone which is a problem, because by the time it has detected the DTMF tone, it has already passed a short amount of it.
Using DTMF with WebRTC - Web APIs | MDN
https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API/Using_DTMF
In order to more fully support audio/video conferencing, WebRTC supports sending DTMF to the remote peer on an RTCPeerConnection. This article offers a brief high-level overview of how DTMF works over WebRTC, then provides a guide for everyday developers about how to send DTMF over an RTCPeerConnection. The DTMF system is often referred to as "touch tone," after …
android - DTMF tone in RecognitionListener ...
https://stackoverflow.com/questions/5734555/dtmf-tone-in-recognitionlistener-onreadyforspeech-mistaken-for-speech
The Google Voice Search comes with a significant delay from the moment you call it via startActivityForResult () until its dialog box is displayed, ready to take your speech. This requires the user to always look at the screen, waiting for the dialog box to be displayed, before speaking. So I was thinking of generating an audible signal instead ...
Deprecated - DTMF and Speech Recognition on Asterisk ...
https://www.lumenvox.com/knowledgebase/index.php?/article/AA-01144/0/Deprecated-DTMF-and-Speech-Recognition-on-Asterisk.html
When you call SpeechBackground () to perform speech recognition, Asterisk listens for both speech and DTMF entry. As soon as it detects a DTMF key press, it immediately stops streaming audio to the Speech Engine and it will then collect exclusively DTMF for that interaction. DTMF presses are stored in $ (SPEECH_TEXT ()) as a digit string.
RFC 6787 - Media Resource Control Protocol Version 2 (MRCPv2)
https://tools.ietf.org/html/rfc6787
DTMF Recognizer A recognizer resource capable of extracting and interpreting Dual-Tone Multi-Frequency (DTMF) digits in a media stream and matching them against a supplied digit grammar. It could also do a semantic interpretation based on semantic tags in the grammar. ... Since a recognizer would need to receive an audio stream for recognition ...
RTP Payload for DTMF Digits, Telephony Tones and …
https://www.cs.columbia.edu/~hgs/rtp//drafts/draft-ietf-avt-rfc2833bis-02.pdf
DTMF digits and named telephone events are carried as part of the audio stream, and MUST use the same sequence number and time-stamp base as the regular audio channel to simplify the generation of audio waveforms at a gateway. The default clock frequency is 8,000Hz, but the clock frequency can be redefined when assigning the dynamic payload type.
Voice Extensible Markup Language (VoiceXML) Version 2.0
https://voicent.com/developer/docs/advanced-gateway-api/gateway_tutorial/vxml2.0spec.htm
VoiceXML is designed for creating audio dialogs that feature synthesized speech, digitized audio, recognition of spoken and DTMF key input, recording of spoken input, telephony, and mixed initiative conversations. Its major goal is to bring the advantages of web-based development and content delivery to interactive voice response applications.
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