DTMF Detction

Started by Shehryar Amir February 18, 2002

Thanx for your replies.

I have gone through a good Article found on web. It says that no single value of
"N" can meet the ITU-T specs and also gave reason for this. That why two values
are needed. It has taken N= 106 (13.3msec) for high group and N !2 for lower
group frequencies.(two goertzel filters are 106 samples apart).

I could not understand the fisrt statement of "No single value of N can meet
ITU-T spec and it's explination". Could you people explain this?

For reference I am attcaching the document with this mail.

Thanx in advance


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