Dual Tone Multi Frequency

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Related to Dual-tone multi-frequency: touch-tone

Dual Tone Multi Frequency

(communications)
(DTMF, or "touch-tone") A method used by the telephone system to communicate the keys pressed when dialling. Pressing a key on the phone's keypad generates two simultaneous tones, one for the row and one for the column. These are decoded by the exchange to determine which key was pressed.
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Users can now send dual-tone multi-frequency (DTMF) touch-tones from the Badge by verbally reciting the desired digits.
Feature rich with excellent video quality output, the ENCORE premium video processor can be upgraded to include VBR, dual-tone multi-frequency (DTMF)/Contact Closure Detection and DPI RateLock[TM] which guarantees ad insertion bandwidth.
Test calls use Minacom's award-winning VoIP testing technology to measure over 40 service quality measurements including speech quality (MOS), speech power, loss, distortion, clipping and noise, call connectivity metrics such as Post Dial Delay (PDD), as well as dual-tone multi-frequency (DTMF / Touch Tone) transparency.
Chapters are as follows:- Chapter 1 - - Introduction to Real-Time Digital Signal Processing Chapter 2 - Introduction to TMS320C55x Digital Signal Processor Chapter 3 - DSP Fundamentals and Implementation Considerations Chapter 4 - Design and Implementation of FIR Filters Chapter 5 - Design and Implementation of IIR Filters Chapter 6 - Frequency Analysis and Fast Fourier Transform Chapter 7 - Adaptive Filtering Chapter 8 - Digital Signal Generators Chapter 9 - Dual-Tone Multi-Frequency Detection Chapter 10 - Adaptive Echo Cancellation Chapter 11 - Speech Coding Techniques Chapter 12 - Speech Enhancement Techniques Chapter 13 - Audio Signal Processing Chapter 14 - Channel Coding Techniques Chapter 15 - Introduction to Digital Image Processing Appendix A Some Useful Formulas and Definitions.
729ab, as well as dual-tone multi-frequency (DTMF) and dial tone detection/generation telephony algorithms without the need for an external digital signal processing (DSP) device.
The telephony support modules include dual-tone multi-frequency (DTMF), call progress tone, line-echo cancellation (LEC), acoustic echo cancellation (AEC), jitter buffer, caller identification, voice activity detection and comfort noise generation.
3 includes important new product features and enhancements, including Dual-tone Multi-frequency (DTMF) capability, multi-platform support, and support for XUDT and XUDTS messages.
4 Kbps transmission/reception, MR (Modified READ) and MMR (Modified Modified READ) data compression, Dual-Tone Multi-Frequency (DTMF) detection, and Error Correction Mode.

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