Spdif Input to USB 24 bit

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R

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Joined 2009
#1
Hello,

I have a great 24/96 ADC box with coaxial Spdif and AES/EBU outputs. I would like to make a Spdif to USB interface to handle stereo 24 bit audio into my laptop. Here are the chips I would like to use: TI DIR9001 for converting Spdif to I2S, and TI TAS1020B for streaming I2S to USB.

http://focus.ti.com/docs/prod/folders/print/dir9001.html
http://focus.ti.com/docs/prod/folders/print/tas1020b.html

The reason for doing this is to have a simple interface without buying an interface with more features than I need. Am I correct in believing that these both will handle 24 bit audio? Any input on implementing this is welcome, as well as other ideas or warnings !

thanks,
Brian
 
#3
Well those look very advanced "USB Streaming Controllers" so im guessing they could do it but i have no idea how to use one of those.

I saw the other one can output 4 I2S streams. I would love if it could act as a 5.1 USB sound card for use in my amp. But sadly i have no idea how these things even work.😕

Hope someone knows how to use these.
 
#4
My guess is these will handle the job. You know you will have to write firmware for the USB interface. It is an 8052 microcontroller at heart. It will have to initialize both chips, communicate with your laptop that it's a standard audio input, and handshake data packets via USB protocols. I'm sure T.I. has a library of code functions you can draw from, but it's not a simple matter of putting a couple of chips on a PC board and running wires.
 
#7
If your laptop has a PC Card (PCMCIA) slot, it might be worth checking if there's any off-the-shelf cards that provide S/PDIF in.

I found the Digigram VXpocket on eBay... not exactly cheap, though.
And the Audigy 2 ZS Notebook, which appears to have S/PDIF in and out.
 
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