07.12.2006 12:00 AM
Audio Compressors and Other Signal Processing in 5.1 Mixing
If you use an audio compressor (for reducing the loudest parts of the signal; we're not talking bit-rate reduction here), limiter, gate, or other type of processing for the left and right channels, front or rear, make sure that the compressor or other processing gear is set so that the two channels are linked.

Typically, when channels are linked, one becomes the master and the other the slave. The master channel controls the processing functions, like the threshold where audio compression kicks in and how much is applied. The link ensures that the same kind and amount of processing is applied to both channels simultaneously. This in turn helps ensure that the intended sound localization is maintained throughout an encode/decode cycle (five channels to two, and then back to five) for delivering surround sound to the consumer.

If signal processing is different for the left and right channels (even though the knobs may look like they're set the same) it's possible that the decoded sound may not be positioned properly, and may even appear to wander, depending on the processing and the differences between the two channels.

As always, monitor downmixes and decoded upmixes to make sure the mix heard by the end listeners is the one you want them to hear.

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

Tuesday 03:07 PM
WMUR-TV Says FAA Drone Rules Preclude ENG
The FAA’s current rules and proposed ban on flight over people, requirement of visual line of sight and restriction on nighttime flying, effectively prohibit broadcasters from using UAS for newsgathering. ~ WMUR-TV General Manager Jeff Bartlett

Zazil Media Group /   Thursday 11:51 AM
Orad Presents 3D Pre-Visualization at NAB Booth SL6317
Wall Street Communications /   Thursday 03:53 PM
Digigram Marks 30 Years of Innovation With Launch of New Visual Identity

Featured Articles
Discover TV Technology