08.08.2006 12:00 AM
AES Digital Audio Eye Display
When commissioning or troubleshooting a digital audio system, remember to check the eye pattern. The eye pattern is a representation of the analog voltage that carries the digital audio information and is displayed on an oscilloscope.

Some scope-based or raster-based specialized audio measurement equipment include the eye display along with calibrated graticules to help determine such values as signal amplitude, jitter, rise time and overshoot.

The eye display checks the integrity of the transmission path as well as the digital audio signal output from each piece of equipment at each stage along the signal path.

If all is well, the eye display looks less like an eye than a box with a flat top and bottom, and sides that show distinct crossings (X-shapes). But, if there are problems, the eye starts to close in and the sides start to round off. The lines that represent the eye start to become thicker.

The more the eye closes, the less likely an AES receiver will be able to properly detect the transitions that indicate a one or a zero. If things get really bad, and the eye is closed (or nearly so), a receiver may not be able to detect the AES signal at all.

Post New Comment
If you are already a member, or would like to receive email alerts as new comments are
made, please login or register.

Enter the code shown above:

(Note: If you cannot read the numbers in the above
image, reload the page to generate a new one.)

No Comments Found

Thursday 11:07 AM
The Best Deconstruction of a 4K Shoot You'll Ever Read
With higher resolutions and larger HD screens, wide shots using very wide lenses can be a problem because they allow viewers to see that infinity doesn’t quite resolve into perfect sharpness.

Featured Articles
Discover TV Technology