Is there any test cd to test jitter using a scope ? - diyAudio
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Old 9th August 2007, 10:10 AM   #1
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Default Is there any test cd to test jitter using a scope ?

Hello

Is there any test cd to test jitter on a cd player by using a scope ?

Thank

Gaetan
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Old 9th August 2007, 01:34 PM   #2
oshifis is offline oshifis  Hungary
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Test the DAC latch enable signal with a scope. The jitter you get there is the jitter of the system.
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Old 9th August 2007, 07:15 PM   #3
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Take a read through the works of the late Julian Dunn over at www.nanophon.com

An oscilloscope is no way to observe or measure jitter - because the 'scope's internal timbase is far worse. This means that you don't observe jitter directly on a scope, but an intermodulation product between the two timebases...
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Old 10th August 2007, 07:57 AM   #4
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Hello

Yes, I seen that a scope don't do the job.

But I did found a 16bit/44.1kHz JTEST signal wave file. Made of a 11025Hz square wave with 229.6875Hz LSB.

So I did burn a cd with that signal and use it with my Denon DCM-420 cd player, and I use my sound card and a FFT software who go down to -140 db, the result seem good since my Denon have a jitter at -90db from the 11025Hz signal 0 db.

Gaetan
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Old 10th August 2007, 09:24 AM   #5
oshifis is offline oshifis  Hungary
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IMHO for measuring jitter one needs a test set with much lower jitter specs than the signal to be measured. I doubt any soundcard has better jitter than the master clock in the CD player.

In terms of FFT, both the jitter of the analyzer's timebase and the jitter of the measured signal will have the same effect: the spectral line will have noise sidebands (it will become thicker at the base). It is not possible to separate the contribution of the two.
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