Digital Audio

Jitter (in audio)

The Music Telegraph | Text 2019/02/25 [14:30]
Digital Audio

Jitter (in audio)

The Music Telegraph| 입력 : 2019/02/25 [14:30]

▲ Ideal Sampling Clock (in blue) vs Jittery Sampling Clock (in red)

: We can see the problems that appear when AD Conversion is doing the sampling with a jittered sampling clock. Due to the small differences between the ideal clock and the jittery clock, the analog signal’s points are being improperly sampled.  

© AudioProbe Inc.

 



Jitter (in audio)

 

All digital audio systems have to use analog-to-digital signal conversion (AD Conversion) and digital-to-analog signal conversion (DA Conversion). AD Conversion changes a continuously variable analog signal to a discrete digital signal values from the continuous signal at regular time-interval (sampling) and discretizing its amplitude-variable (quantizing). DA Conversion does the opposite, taking a finite number of digital samples and piecing them together into a single analog signal.

In this conversion process, if you can minimize the inevitable damage or deterioration that occurs, then the resultant sound quality will more closely resemble the original audio.

 

 

What is Jitter?

- Inaccuracies in timing between digital transfers

- Time distortions of recording/playback of a digital audio signal

 

 

Digital-analog converters (DAC) transform sample sequences (digital values) to analog voltage level sequences. In the ideal case, same time distance between the samples should be provided. The distance is defined by what we call clocking. However, clocking in not ideal and the restored signal is distorted like it is shown in the picture.

Jitter is thus a deviation of time between the digital and analog samples (deviation of sampling rate).

▲ Jitter time distortions of playing back digital signal

© Headfonics

 

At upper left part of the picture, we can see the original musical signal (green) captured into digital form. At the bottom left part of the picture we can see the restoration of the captured digital signal back to analog form.

The samples (vertical lines with a dot) have unstable time position (jitter) on the horizontal axis. Thus the restored signal is distorted. We can see this distortion at right part of the picture.

**Excerpts from AudioProbe (http://audio-probe.com/en/documentation/clock-jitter-and-audio-quality/) and Headfonics (https://headfonics.com/2017/12/what-is-jitter-in-audio/)

 

 

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