04 June 2010, 16:13 | #1 |
Computer Nerd
Join Date: Sep 2007
Location: Rotterdam/Netherlands
Age: 47
Posts: 3,767
|
Simple 14 bit audio question...
Hi,
If I take a 16 bit audio file, and chop of the bottom two bits from each sample, it seems that the sound quality (when playing back in 14 bit on the miggy) isn't reduced. What I want to know is simple: Is there really no audible difference, or is there still some? Any thoughts are appreciated Edited: Corrected the bad sentence. Last edited by Thorham; 04 June 2010 at 17:07. |
04 June 2010, 22:39 | #2 |
Computer Nerd
Join Date: Sep 2007
Location: Rotterdam/Netherlands
Age: 47
Posts: 3,767
|
This seems to be solved thanks to amiga.org (no offense guys ). Apparently, 14 bit replay routines already chop off the bottom two bits of a 16 bit sample.
Here's the post: Unless anyone has anything to add, this is a done deal |
05 June 2010, 19:58 | #3 | |
Registered User
Join Date: Mar 2009
Location: moon
Posts: 373
|
Quote:
Conversion to 14 bit may not be "necessary", because you can toss away the extra bits at runtime. But if you're going to throw them away, why store them at all? They take up additional unnecessary space. Also, simply throwing away the least significant bits does not result in the best possible sound quality. Dithering and noise shaping reduce (but don't eliminate) the quality loss caused by bit reduction. So there are two reasons to convert: Disk space and sound quality. (Of course you could dither and noise shape in real time, but it costs CPU time that isn't insignifficant on an Amiga.) |
|
06 June 2010, 08:45 | #4 | |||
Computer Nerd
Join Date: Sep 2007
Location: Rotterdam/Netherlands
Age: 47
Posts: 3,767
|
Quote:
Quote:
Quote:
Probably, but it's still an interesting idea |
|||
06 June 2010, 10:17 | #5 | |||
Registered User
Join Date: Mar 2009
Location: moon
Posts: 373
|
Quote:
Quote:
Quote:
Noise shaping is tricker, as you use coloured/filtered noise instead of white in order to move the hissing to parts of the frequency spectrum where our ears are less sensitive. As mentioned in the other thread, both methods will make it harder to compress the signal though, as noise doesn't compress well. |
|||
06 June 2010, 10:30 | #6 | |
Computer Nerd
Join Date: Sep 2007
Location: Rotterdam/Netherlands
Age: 47
Posts: 3,767
|
Good I'm currently playing around with deltas between samples, and chopping off two bits will make the deltas smaller.
Quote:
|
|
06 June 2010, 10:46 | #7 | |
Registered User
Join Date: Mar 2009
Location: moon
Posts: 373
|
Quote:
It may not improve the quality substantially, but if you're only concerned about substantial quality differences, I still recommend to consider lossy compression. For example, it's not impossible that noise shaped lossy compressed audio will sound better than lossless compression where the bits are simply chopped off. You'll have to try to know for sure though. |
|
06 June 2010, 10:55 | #8 | |
Computer Nerd
Join Date: Sep 2007
Location: Rotterdam/Netherlands
Age: 47
Posts: 3,767
|
Quote:
Interesting indeed If it proves impossible to lossless compress the audio onto a single CD (source is 1.67 gigs ), then I'll most certainly take this in consideration I do think that it can be done, because the music is looped. It's just that theres a total of 93 tracks, and most of them are looped, so this would be quite a lot of work to do by hand |
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
15 bit 44 khz audio idea. | Thorham | Coders. General | 33 | 15 September 2021 06:22 |
High Quality reproduction of Audio on 8 bit. | pandy71 | Amiga scene | 0 | 01 July 2013 15:08 |
Simple Question | bpazolli | Coders. General | 15 | 22 January 2009 17:16 |
Simple question | Raffaz | New to Emulation or Amiga scene | 2 | 10 July 2007 14:08 |
Simple A1200 Question | Methanoid | support.Hardware | 4 | 29 April 2005 00:34 |
|
|