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Thanks for answer.
If I correct convert the -12dB = 0,25. Does this mean the input singnal (speech or other noise) level should not be higher than 0,25 amplitude of DTMF?
DTMF decoder does't work correctly
Hi
(sorry for my poor english)
I use decoder DTMF HT9170d in my project. I connected my device to telephone line - it worked great when it was silence on the line. The problem occured when I was talking on the phone and tried send DTMF code at the same time-...
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