Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!zephyr.ens.tek.com!orca!ka7axd.WV.TEK.COM!mhorne From: mhorne@ka7axd.WV.TEK.COM (Michael T. Horne) Newsgroups: comp.dsp Subject: Re: My pitch shifter for 56000 Keywords: development, system, IBM, cost Message-ID: <4676@orca.WV.TEK.COM> Date: 25 Sep 89 17:00:09 GMT References: <5334@merlin.usc.edu> <1989Sep25.074206.972@ivucsb.sba.ca.us> Sender: nobody@orca.WV.TEK.COM Reply-To: comp.dsp Organization: Tektronix, Inc. Lines: 39 > compatible and I really don't need to have a stand-alone system (like yours > with a serial port). Does anyone out there have a 56001 system running on > an AT platform that they built/bought for under $1K? If you're looking for a board for the PC to experiment with (assuming you don't want to build one yourself), you can pick up the PC-56 from Ariel. I believe it costs $595 w/o the TI codec option (add $100 for this option). Actually, I suspect you can buy the codec for very little money from a distributor and save yourself the extremely overpriced option that Ariel provides. If you're looking for `CD quality' audio, I suggest you stay away from the codec entirely (it is exactly that; a codec, narrow bandpass and all...). The PC-56 has a wide socket on the board for external peripherals providing access to the 56K's data/address bus. I'd suggest wiring up a separate board for acquisition, preferably external to the PC box with a separate supply, since the PC is loaded with RF and noisy supply lines. If you don't want to spend that much, and you feel you can handle a wire-wrap gun and soldering iron, I'd suggest wire-wrapping a system on a board that drops into the PC. I've done exactly that for a project I'm working on, and its fairly straightforward. If you don't expect to have/need any external RAM (at least for a while), you can really save a lot of time and effort. You should be able to put together a system with 16Kx24 RAM for < $200 bucks, perhaps < $100 in a `stripped down' version. > Does adding a second > pair of ADC/DAC's for stereo increase the cost/complexity a lot? Complexity, no. Cost, probably, depending on the quality of the ADC/DACs that you use. You should be able to configure two complete, good quality, 12-bit channels (both directions) for < $50 extra. Prices rise quickly for more bits. I'd suggest looking at Moto's new S/D ADC (the 56ADC16) which will provide you with clean, 16-bit input at 100KHz (and it interfaces nicely to the 56K). If you are planning on keeping the acquisition circuit internally within the PC, using more than 12 bits may be moot unless you take great care in layout and cleaning up the supply lines. Mike