qac@occrsh.ATT.COM (Quentin_Conner) (11/07/89)
I would like to capture the digital output from my C.D. player. There is a jack on the back which provides access to this, but I don't know the format of the bitstream. I know that digital audio is 16 bit linear PCM at a sampling rate of 44.1(?) kHz but what I don't know is what kind of framing and timing information they stick in the bitstream. Is there any kind of industry standard for these 'digital outputs' or am I out of luck? It would be nice to also grab the subcode data also. I know of at least one released C.D. that has some type of graphics in the subcode that can be displayed on a monitor or T.V. while the music is playing (with some probably proprietary adapter). Analog Devices has a 'Industry standard pinout' DAC in a 16 pin package (AD1856) which has three digital inputs - CLK, LE, DATA. I take it that the serial bitstream coming into this device is standardized - probably just the linear PCM audio signal. They also make an 18 bit version. Thanks, Quentin Conner -------------- qac@occrsh.att.com
qac@occrsh.ATT.COM (Quentin_Conner) (11/09/89)
hedley@imagen.UUCP (Hedley Rainnie) writes: >You are in luck. kchen@Apple gave me the following reference which >a friend of mine has used to construct a circuit to do just what you are after. >] The AES/EBU digital audio format is described in the *second* edition >] of Ken Pohlmann's "Principles of Digital Audio", Howard Sams & Co, 1989. >] ISBN 0-672-22634-0. >Hedley >-- >{decwrl!sun}!imagen!iit!hedley >hedley@imagen.com Sounds like a good source. Thanks for the help guys. Quentin