Mozilla Dizzy

About DTMF dialtones

f(Hz) 1209 1336 1477 1633
697 1 2 3 A
770 4 5 6 B
852 7 8 9 C
941 * 0 # D

The lower frequency (corresponding to the row) is emitted with less amplitude than the higher one, and precisely of 2 dB (that means that the amplitude is 1.259 times smaller). Every dtmf-dialtone has a length of 100ms followed by pause of 50ms length. The samplerate is 11025Hz (can't generate 8KHz on my PC ;-) with 8Bits mono.