prie@escher.cc.rochester.edu (Tod Rieger) (06/25/91)
If only there were an inexpensive alternative to external
processors for CD players, ....
Reading a description of the $2000 Theta Pro Basic in issue
67 of The Absolute Sound, I noticed that it centers around a
Motorola 24-bit DSP with a 56-bit accumulator. Sound (heh, heh)
familiar? This leaves me with two questions:
1) What is the format of the CD player's digital output?
2) How can I attach the CD player's digital out to the DSP port?
NeXTime.teg@peabody.iusb.indiana.edu (Tim Gurbick) (06/25/91)
In article <1991Jun25.005203.10344@galileo.cc.rochester.edu> prie@escher.cc.rochester.edu (Tod Rieger) writes: > > If only there were an inexpensive alternative to external >processors for CD players, .... > > Reading a description of the $2000 Theta Pro Basic in issue >67 of The Absolute Sound, I noticed that it centers around a >Motorola 24-bit DSP with a 56-bit accumulator. Sound (heh, heh) >familiar? This leaves me with two questions: > Krell Digital has made use of the 56k1 for quite some time. This year, to add to the SBP-32X DA processor (2 56k's - 1 per channel) and the Stealth, they came-up with the SBP-64X, with 64 times oversampling, and four DSP56k's (two per channel). Thinking of buying one to fool-around with? Well, you can have the 64X or a cube; retail is $8950. Of course, the 32X is only $3500. Followups to rec.audio.high-end? =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Tim Gurbick a.k.a. teg@peabody.iusb.indiana.edu Dept of Math & CS: 237-GEEK Help: 911 d.b.a. teg@natasha.iusb.indiana.edu `whois \!TEG12` Traci:0x45 SYSV: just say NO! teg@nova.cc.purdue.edu !hoser The Amiga: Born a Champion Me: International Unix Standards Bored, educational division: (219)237-IHEX address: CS Dept IUSB POB 7111 1700 Mishawaka Avenue, South Bend, IN 46634 "Work FOR? I don't work FOR anybody... I'm just having fun." - The Doctor
paul@cgh.cgh.com (Paul Homchick) (06/25/91)
>> Reading a description of the $2000 Theta Pro Basic in issue >>67 of The Absolute Sound, I noticed that it centers around a >>Motorola 24-bit DSP with a 56-bit accumulator. Sound (heh, heh) >>familiar? This leaves me with two questions: > >Krell Digital has made use of the 56k1 for quite some time. These products do use the 56001 (or several of them) but they ALSO use standard DAC chips. The 56001 is used only to over-sample (average?) the incoming digitial bit-stream and then feed it to the DACs. Presumably, they do a little bit more than that for the money they are charging, but who knows? They aren't talking. When I first heard of using a 56001 in a outboard digital to analog convertor, I thought it was a very fine idea. But when I look at the architecture of the whole product, I have to wonder what the big advantage is. -- Paul Homchick :UUCP {rutgers | uunet} !cbmvax!cgh!paul Chimitt Gilman Homchick, Inc. :Internet paul@cgh.com 259 Radnor-Chester Rd, Suite 140 :MCI PHOMCHICK Radnor, PA 19087-5299 :GEnie HOMCHICK
kls30@duts.ccc.amdahl.com (Kent L Shephard) (06/25/91)
In article <1991Jun25.005203.10344@galileo.cc.rochester.edu> prie@escher.cc.rochester.edu (Tod Rieger) writes: > > If only there were an inexpensive alternative to external >processors for CD players, .... > > Reading a description of the $2000 Theta Pro Basic in issue >67 of The Absolute Sound, I noticed that it centers around a >Motorola 24-bit DSP with a 56-bit accumulator. Sound (heh, heh) >familiar? This leaves me with two questions: > >1) What is the format of the CD player's digital output? > The outputs will either be AES/EBU or S/PDIF. The data is Manchester Coded with embeded clock. You would need something to decode the data stream and multiplex the data for the DSP input. >2) How can I attach the CD player's digital out to the DSP port? > > NeXTime. Singular Solutions A/D64x will work. Another product that will work is one I'm in the process of developing. Cost should be much less than the $1300 wanted for the A/D64x. I'll let everyone know when the prototype is complete. I'll either try to find a partner with capital to market the product or just sell plans to individuals that know their way around wire wrap and soldering irons. Kent -- /* -The opinions expressed are my own, not my employers. */ /* For I can only express my own opinions. */ /* */ /* Kent L. Shephard : email - kls30@DUTS.ccc.amdahl.com */
prie@escher.cc.rochester.edu (Tod Rieger) (06/25/91)
The point of this project is to avoid purchasing
a Theta/Krell/Wadia/PS-Audio external processor. I
believe the NeXT has most of the hardware and the
kind people at Theta Digital Corp will be sending
me references for software.
The point of a external processor is that it
makes digital audio sound better (ie, bearable).
Most oversampling techniques only optimize for
frequency response, but with their additional
computational power (ie, cost) external processors
also optimize time domain, group delay, and
transient ability. (There's more to audio than
just frequencies.)
NeXTime.drin@ersys.edmonton.ab.ca (Adrian Smith) (06/26/91)
Any chance you could add me to the list (which I'm sure will grow) of people who'd be interested in such a product? I'd be interested in the finished product and/or the plans for such a machine... Thanks -drin Adrian Smith drin@ersys.edmonton.ab.ca Edmonton Remote Systems: Serving Northern Alberta since 1982
shanega@athena.mit.edu (Shane G. Artis) (06/27/91)
In article <mBm642w164w@ersys.edmonton.ab.ca> drin@ersys.edmonton.ab.ca (Adrian Smith) writes: >Any chance you could add me to the list (which I'm sure will grow) of >people who'd be interested in such a product? I'd be interested in the >finished product and/or the plans for such a machine... > >Thanks > >-drin > >Adrian Smith drin@ersys.edmonton.ab.ca >Edmonton Remote Systems: Serving Northern Alberta since 1982 Add me too! I will build it myself if you publish the plans, or consider a low-priced final product. Good luck with the development! Shane shanega@athena.mit.edu