Single audio decoding circuit

Published:2011/7/8 4:26:00 Author:Fiona | Keyword: Single audio decoding | From:SeekIC

Single audio decoding circuit is shown as above,the figure is the used for dual tone multiple frequency(DTMF) demoder circuit.DTMF modulating signal sent from external line leads to the single narrowband filter which is composed of integrated circuit LM567 and the seven center frequencies are 697 ~ 1447Hz,then it is paired sent into nand gate and outputs corresponding 1,2, ... , 9,0 and other numbers.



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