Telephony Products
DTMF
The algorithm implemented is the
DTMF (Dual Tone Multi-Frequency) signalling system. DTMF is the most common
signalling method used within the telephone network, and has now largely replaced
loop disconnect ("pulse") dialling. DTMF works by employing pairs
of tones to encode the digits 0-9, #, * and A to D. DTMF receivers need to
correctly detect the presence of these tones, while eliminating background
noise and allowing for distortions introduced by the network. The Mitel test
tape exists to verify the performance of DTMF receivers.
DTMF applications include reception
for public or private telephone exchanges; telephony and line test equipment;
remote control of computer and telephone equipment.
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