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Joe Murphy Jr

In Reply to: RE: BD player 7.1 analog out... posted by wheezer on November 19, 2009 at 16:38:44

There are players which can alter the level of their analog outputs. These players change that level in the digital domain.

For DSP work, changes are done in the digital domain. The analog input would be converted to digital and then the processing would take place. This new signal should then be converted to analog for volume adjustment, but there may be processors out there which adjust the volume in the digital domain.

For an AVR, the better ones will be analog from the input to the output and will only convert to digital if you require processing of the signal (bass management, delay, etc). The lesser ones will convert all analog inputs to digital -- regardless of whether you want to do processing or not.

Follow Ups:

A little? - wheezer 17:22:57 11/19/09 (2)
Great explanation.
In audio, the last place one would want to alter volume is the digital domain.
Is it worth doing analog out if it's up/down converted?
- no conversion via analog - Joe Murphy Jr 20:19:02 11/20/09 (1)
  If you use a player's analog outputs, there is no up or downconversion of the digital signal.* However, adjusting the volume via the player (since this is done in the digital domain) will degrade the audio. By how much? That's for the user to decide.
  
  * Some Panasonics offer a resampling mode that will do this, but the change in the sound -- good or bad -- means you have changed what the original content was intended to sound like. Furthermore, the use of this feature is willingly made by the user (ie, it's not being forced by the manufacturer/author).
  - RE: no conversion via analog - wheezer 20:35:52 11/20/09 (0)
    I'm familiar with that process as I have a mac mini for headless audio playback. Adjusting the volume in itunes is a no-no.
    Thank you.

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