graeme@research.canon.oz.au (Graeme Wong See) (04/28/91)
I have a digital output on my Yamaha CD player. Could anyone give me any information on how to decode the information that comes out on the output or pointers to where this information can be found Thanks, Graeme -- Graeme Wong See, Hardware Engineer | Net: graeme@research.canon.oz.au Canon Information Systems Research Australia | Phone: +1 61 2 805 2912 P.O. Box 313 North Ryde, NSW, Australia 2113 | Fax: +1 61 2 805 2929
jeh@dcs.simpact.com (05/01/91)
In article <1991Apr28.131743.3630@research.canon.oz.au>, graeme@research.canon.oz.au (Graeme Wong See) writes: > I have a digital output on my Yamaha CD player. Could anyone give me any > information on how to decode the information that comes out on the output > or pointers to where this information can be found Second the motion. --- Jamie Hanrahan (x1116), Simpact Associates, San Diego CA Internet: jeh@dcs.simpact.com, or if that fails, jeh@crash.cts.com Uucp: ...{crash,scubed,decwrl}!simpact!jeh
mll@hpfcso.FC.HP.COM (Mark Luce) (05/04/91)
/ hpfcso:sci.electronics / jeh@dcs.simpact.com / 5:32 pm Apr 30, 1991 / In article <1991Apr28.131743.3630@research.canon.oz.au>, graeme@research.canon.oz.au (Graeme Wong See) writes: > I have a digital output on my Yamaha CD player. Could anyone give me any > information on how to decode the information that comes out on the output > or pointers to where this information can be found Second the motion. --- Jamie Hanrahan (x1116), Simpact Associates, San Diego CA Internet: jeh@dcs.simpact.com, or if that fails, jeh@crash.cts.com Uucp: ...{crash,scubed,decwrl}!simpact!jeh ---------- The digital outputs found on some CD players are designed to be used with pre-amps which have their own D/A converters, or outboard D/A converters. There are more and more of these types of products on the market. The idea is to keep the signal in digital form as long as possible...
john@newave.UUCP (John A. Weeks III) (05/04/91)
In article <1991Apr30.163259.2311@dcs.simpact.com> jeh@dcs.simpact.com writes: >In article <1991Apr28.131743.3630@research.canon.oz.au>, graeme@research.canon.oz.au (Graeme Wong See) writes: > > I have a digital output on my Yamaha CD player. Could anyone give me any > > information on how to decode the information that comes out on the output > > or pointers to where this information can be found I know absolutely nothing about the digital formats, but I do know that there are at least two different types of digital output on CD players. One type is the random access digital signals that you would need to make the CD player into a CD rom reader. There was another format a few years ago that never really got off of the ground. It was supposed to be for video and text to put liner notes, photos, and lyrics directly onto a CD. You would connect the decoded output to your TV or Video monitor, then watch the stuff as the CD played. I recall seeing several CD players that offered this (including Sony machines), but only a hand full of CDs ever encoded any information in this format. The plug for this was similar to a DIN connector, only smaller. -john- -- ============================================================================= John A. Weeks III (612) 942-6969 john@newave.mn.org NeWave Communications ...uunet!tcnet!wd0gol!newave!john
jeh@cmkrnl.uucp (05/13/91)
In article <7480020@hpfcso.FC.HP.COM>, mll@hpfcso.FC.HP.COM (Mark Luce) writes: > The digital outputs found on some CD players are designed to be used > with pre-amps which have their own D/A converters, or outboard D/A converters. > There are more and more of these types of products on the market. The idea > is to keep the signal in digital form as long as possible... good lord, man, we KNOW that much. The question is, how do you go from the signal at the digital out jack to (for example) 2x16-bit parallel data? --- Jamie Hanrahan, Kernel Mode Consulting, San Diego, CA Internet: jeh@dcs.simpact.com, or if that fails, jeh@crash.cts.com Uucp: ...{crash,scubed,decwrl}!simpact!jeh
ww@macwcw.meediv.lanl.gov (William Ward) (05/16/91)
In article <1991May12.181457.10@cmkrnl.uucp> jeh@cmkrnl.uucp writes: >In article <7480020@hpfcso.FC.HP.COM>, mll@hpfcso.FC.HP.COM (Mark Luce) writes: >> There are more and more of these types of products on the market. The idea >> is to keep the signal in digital form as long as possible... > >good lord, man, we KNOW that much. The question is, how do you go from the >signal at the digital out jack to (for example) 2x16-bit parallel data? It been a while since the original entry was posted...I thought someone more knowledgeable would have responded by now, so, I'll go ahead and through in my $0.02 worth. There are two standards for serial digital audio data exchange: AES/EBU (sometimes an XLR connector) and S/P-DIF. I don't know where you would look for the standards documents (the Audio Engineering Society would be one starting point), but knowing the names should help. I've seen an AES/EBU document put out by Sony, I think, some 40 pages long with all the info about the serial word format, error correction bits/schemes, etc.. At a recent equipment exhibition, I saw a German company (HEAD Acoustics Gmbh) that was showing a neat binaural processing system (with a dummy head stereo mic as input and electrostatic headphones for output) that was based on a vanilla 286 machine that had NO A/D or D/A converters attached...they cleverly did all of their processing using a DAT machine that is part of the package, exchanging data over the digital ports with their own special hardware to interface (it could be some 3rd party, I don't know). National Instruments was displaying their new DSP board (320C30-based) at the same exhibition, so I said to their engineers, "Hey, you've got a serial digital input on that thing, why can't you add some software to do digital audio I/O?" I'm not sure if anything ever came of that yet. I think they could find a good market there. If anyone is lucky enough to have a good DSP board in their PC, you could probably get what you need with trivial hardware and some programming using information from the standards. But, for the real question, "How can I use the data with hardware that costs less than my CD player?", I really don't have an answer. The standards may give enough info for a good hardware jock to come up with a circuit, and there are sure to be VLSI chips that would help a great deal, if you can find them. But the DSP route is a good one because gives you some options to answer the next question: "OK, I've got parallel data coming in at 176 kbytes/second...what do I do with it?" Bill Ward Disclaimer: I am not an EE, so the above could be complete drivel. My knowledge of Head Acoustics and National Instruments products comes only from a visit to the exhibit mentioned and a few brochures.
pyrros@cis.udel.edu (Christos Pyrros) (05/17/91)
I have a NeXTstation 8/105, which as some of you may know, has an on-board Motorola DSP 56001. The docs offer the following pin i/o data: 1 SCK 2 SRD 3 STD 4 SCLK 5 RXD 6 TXD 7 +12v; 500mA 8 -12v; 100mA 9 GND 10 GND 11 GND 12 SC2 13 SC1 14 SC0 15 GND I know I need to contact Motorola to get more info on the DSP, but can I hook up a cd player with digital output to this? How bout a Laser Disc player with digital out? And are these output AES/EBU or S/P-DIF or both? Also, does anyone know if the Pioneer VSX-D1S receiver (which has a DSP) has digital i/o? The store here that sells them _can't_ show me the back panel and they have lost the owners manual; needless to say I'm taking my business somewhere else but mail order places can't answer these questions. Thanks, Chris