Delta Modulation for Audio

[kkdelabaca]

Hello,

I have one SERDES that can send 10 bit at 5MHz. One of this 10 bits, are destined to send one audio signal and I think that one of the best metods is use one Delta Moulator.

The question is: ¿Exist any IC that implement the Delta Modulation for audio applications?

Thanks!!

 

[FvM]

Most recent audio codecs respectively audio DACs are using SD internally. A chip with a serial input can be interfaced to your bitstream, if you manage to generate an additional frame sync. Alternatively, you can send a SD modulated bitstream and apply it to a low-pass.

 

[kkdelabaca]

Thanks FVM for your help.

In www.ti.com I see some converters but the output are always one binary number like the PCM1808: https://focus.ti.com/docs/prod/folders/print/pcm1808.html

Exist some IC with only one bit indicating if the signal will be hi or low than the previus sample?

 

[FvM]

No, they don't exist. But I can't see an advantage of using this kind of differential coding. It's too limited in amplitude dynamic. Today's sigma-delta technique is using the differential only for an internal error signal but can generate full scale signal within the output filter bandwidth.