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encoder, decoder to transmit digital data on voice band ?

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cell1

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I search an encoder and a decoder on a voice band to transmit digital data.
I try to use this to transmit encrypted digitized voice trough analog telephone line.

Thanks,
Cell1.
 

Re: encoder, decoder to transmit digital data on voice band

You may use the Enhanced Variable Rate Codec (EVRC)
 

Re: encoder, decoder to transmit digital data on voice band

Thanks. I try to find.
 

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