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From: "Dan McDaid"
Subject: USB Design. Need advice.
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Fri, 27 Dec 2002 01:26:02 -0000
NNTP-Posting-Date: Fri, 27 Dec 2002 01:28:06 GMT
Organization: blueyonder (post doesn't reflect views of blueyonder)
Hi. I need to make an isochronus usb device that has two audio out channels
and two in.
I'm new to USB but have a decent background in electronics.
My question is pretty simple. I can rig up a USB-DAC IC to get a singe
audio out channel. Now if i use two of these ICs and put them behind a
USB-Hub IC then with appropriate drivers I can send the digital streams to
each IC, which are essentially separate devices. Similarly, I can rig up
two ADC-USB circuits and put them behind this same internal hub. Bang it
all in a box, stick some phono plugs on and a usb cable and with any luck I
can get down to writing the software.
This all seems pretty sloppy though and there must be a way I can combine
all this stuff into one device without this whole hub idea. Trouble is, Ive
never used USB before and should really do some reading. Theres so much on
the net though its hard to wade through all the irrelevant stuff.
Im planning to build my own version of www.finalscratch.com. The idea is,
two vinyl turntables are plugged into the 2x IN channels, the two out
channels get connected to the DJ mixer console. The two vinyl disks that
are put onto each turntable respectively, are pressed with some sort of
waveform that can be interpreted digitally as a timeline. (waiting on a
replacement LP from Stantons FinalScratch - in post so I can see how it
works and rip it off - cheaper than having my own vinyl pressed several
times until I got the right idea!). The idea is that two mp3s are streamed
out the interface into the mixer. The timebase of each mp3 is mapped to and
controlled by the vinyl. Thus you can manipulate mp3s exactly like vinyl.
Why do I want to do this? Well apart from the $500 price tag for the
original FinalScratch, its an interesting project.
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