Proceedings of the Acoustical Society of Korea Conference (한국음향학회:학술대회논문집)
- 1998.08a
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- Pages.159-164
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- 1998
Detection of DTMF Signalling for Low Bit Rate Vocoder
저전송률 음성부호화기의 DUAL-TONE MULTIFREQUENCY(DTMF) SIGNALLING
Abstract
We proposes a new detecting algorithm of DTMF tone for low bit ate vocoder so that we use DTMF tones for signalling inthe digital network. Using DTMF tones for signalling, we could not change the conventional IS-95 protocol and control the mobile phone. We apply the root finding to detection of formants and bandwidth to search whether DTMF tones or voice and moreover to find what's kinds of DTMF tones, for instance 1, 2, 3, ......., #, *, A, B, ...., etc. Consequently, proposed method has a good result which is 0.000944% average error rate. It is satisfied with rcommended error rate in ITU-T(
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