skipt@inuxm.UUCP (M Tourville) (01/10/86)
Denon offers an audio test disc on CD, Denon catalog #7147. Anyone out there with knowledge/experience on this CD? My locals don't have it, so I would have to Mail order it-- At the risk of raising old issues under a new guise: I'm planning to rebuild/modify an old preamp. Should I use the test CD or a good signal generator as my source when I take various measurements? (I have access to good test equipment) Skip
schley@mmm.UUCP (Steve Schley) (01/16/86)
In article <316@inuxm.UUCP> skipt@inuxm.UUCP (M Tourville) writes: > >Denon offers an audio test disc on CD, Denon catalog #7147. >Anyone out there with knowledge/experience on this CD? Yes, I own this CD. The complete catalog number is 38C39-7147. Highly recommended. I looked at many test disks, and this one gets my vote for "most complete" and "best value". I found it locally, and paid about $17. The most notable shortcoming is the lack of any error testing: No wedge, no certified errors, etc. (I do this with a regular CD and a piece of black electrical tape.) The disk has 100 tracks. There is a little bit of various musical selections for listening tests, 1001 Hz sine waves at different levels, pure tones for THD testing, low-level tones for dynamic range testing, digital silence ("infinity zero"), swept tones, mixed tones for IM testing, more assorted pure tones, amplitude sweeps at three frequencies for linearity testing, phase sweeps for phase linearity testing, square waves, tone bursts (EIA and EIAJ), impulses, white and pink noise, 1/3 and 1 octave band noise, wow & flutter test tone, a tone consisting of the least significant bit toggling at the sampling frequency, and more musical test selections. The last are quite interesting, as they are reproduced three times at different levels, showing what happens when you run out of bits! (Sounds not unlike a _very_ dirty stylus...) To find your way through this thing, it comes with a 24-page booklet that fits in the jewel box, detailing each and every track in your three favorite languages: English, Japanese, and Digital, supplemented occasionally with waveforms and chart recordings. (The Intro is in German and French, too...) My favorite track is number one (announcer's voice): "Balance check, left channel" "Balance check, right channel" -- Steve Schley ihnp4!mmm!schley