Additionally, that article also gives frequency pairs and notice that the tones are pure sine waves. So, any simple synthesizer that can create a pair of sine waves can produce your tones for you.
ok now look up what dtmf means. :) http://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling At 11:33 PM 9/29/2011, you wrote:
I wonder if that DTMF tone generator can generate telephone tones as well.
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