| Figure 1 |
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| Fig 1—This simple method of vocalizing the depressed digit on a telephone keypad uses a DTMF receiver, voice synthesizer, audio amp, and a few logic gates. |
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| Figure 1 |
|
| Fig 1—This simple method of vocalizing the depressed digit on a telephone keypad uses a DTMF receiver, voice synthesizer, audio amp, and a few logic gates. |
back |