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kkdelabaca
Joined: 18 Apr 2003
Posts: 106
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 01 Jun 2009 6:46 Delta Modulation for Audio |
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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!!
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FvM
Joined: 22 Jan 2008
Posts: 5160
Helped: 767
Location: Bochum, Germany
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01 Jun 2009 7:18 Delta Modulation for Audio |
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| 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.
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kkdelabaca
Joined: 18 Apr 2003
Posts: 106
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01 Jun 2009 13:53 Delta Modulation for Audio |
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Thanks FVM for your help.
In www.ti.com I see some converters but the output are always one binary number like the PCM1808: http://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?
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FvM
Joined: 22 Jan 2008
Posts: 5160
Helped: 767
Location: Bochum, Germany
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01 Jun 2009 15:00 Delta Modulation for Audio |
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| 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.
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