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From: Joe Legris
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020830
X-Accept-Language: en-us, en
Subject: Re: USB Design. Need advice.
Date: Fri, 27 Dec 2002 18:54:58 -0500
NNTP-Posting-Date: Fri, 27 Dec 2002 18:54:16 EST
Organization: Bell Sympatico
Dan McDaid wrote:
> 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.
USB Complete, 2nd ed., by Jan Axelson
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