FAQ: Difference between revisions

From Hydrogenaudio Knowledgebase
(Many changes. See diff.)
mNo edit summary
Line 7: Line 7:


=General Audio Compression=
=General Audio Compression=


;Can I increase quality by converting a lossy compressed file to a higher-bitrate lossy compressed file?
;Can I increase quality by converting a lossy compressed file to a higher-bitrate lossy compressed file?
Line 14: Line 13:


;Does encoding preserves surround info?
;Does encoding preserves surround info?
:'''Short Answer:''' MP3 destroys surround sound information.
:'''Short Answer:''' Depends. MP3 destroys surround sound information. Go see the page on [[lossy]] encoding.
:In addition, check the following links:
:In addition, check the following links:
:* [http://www.hydrogenaudio.org/forums/index.php?act=ST&f=15&t=4639 Experience of a HA Member with Rear Channel] on the HA Forums
:* [http://www.hydrogenaudio.org/forums/index.php?act=ST&f=15&t=4639 Experience of a HA Member with Rear Channel] on the HA Forums

Revision as of 22:06, 23 March 2006

This is a list of Frequently Asked Questions. The questions are grouped according to their categories, then sorted alphabetically.

Please note that this FAQ provides very short answers; explore the links to get deeper information.


General Audio Compression

Can I increase quality by converting a lossy compressed file to a higher-bitrate lossy compressed file?
Short Answer: This is called Transcoding, and the answer is no.


Does encoding preserves surround info?
Short Answer: Depends. MP3 destroys surround sound information. Go see the page on lossy encoding.
In addition, check the following links:


What is the best audio format?
Short Answer: Depends on your needs.
For a detailed explanation, see Audio format guide.


Why do encoded files get clipped when the original WAVs are not clipped?
Short answer:
  1. Quantization errors may cause the signal to clip, and
  2. Gibbs phenomenon through the limitation of bandwidth may cause the signal to clip.
Check the following links for more details:


What is an ABX blind test?
Go see ABX
In addition, check the following links:


What is "transparency"?
Go see transparency


Why not use graphs / frequency analysis to compare codecs?
Nothing can be said about quality or audible difference by looking at pictures, because a lossy encoder works by removing as much inaudible sounds as possible. A lack of frequencies can well mean that some audible parts are missing (bad work, or too low setting), or that the encoder managed a very good compression, removing a lot of useless things.
In addition, check the following links:


MP3-related

Why is joint stereo better than pure stereo ?
You better start here (thread on the HA Forums)


Quality

Simple

  • What do I need to get started?
  • What is ABX?
  • Why is ABX needed?

Advanced

  • What are good test procedures?