IPB

Welcome Guest ( Log In | Register )

HE AAC Audio Quality & Tuning
GreenSeer
post May 23 2012, 15:39
Post #1





Group: Members
Posts: 7
Joined: 23-May 12
Member No.: 100087



I am new to the lossy coding world. I recently became a DROID owner and, in an effort to get down to carrying one device, I ripped all of my music to my DROID at 64 kbps. In the environments I often listen in (Airports, Planes, Rental Cars, Taxi's, etc.) this is good enough for me and has the great benefit of using minimal storage space. The efficiency of a codec that provides satisfactory audio quality while using lower bitrates appeals to me.

My question is whether this codec is still being developed and "tuned"? I guess I am curious as to whether HE-AAC is now about as good as it will ever get. For example, is the crossover point from real sound to where the SBR begins as finely tuned as possible? Will we ever get to the point where a 48 kbps rip is perceived qualitatively by a general audience like a 128 kbps AAC file is today? Thanks!
Go to the top of the page
+Quote Post
 
Start new topic
Replies
GreenSeer
post Jun 26 2012, 03:39
Post #2





Group: Members
Posts: 7
Joined: 23-May 12
Member No.: 100087



Is there a reference or an explanation somewhere for what frequency SBR begins when using HE AAC? It would seem to me that the LC "cut point" would be higher in frequency the higher the bit rate used, so that 48 kbps HE AAC has more use of SBR, relatively, than 80 kbps? Is this correct?
Go to the top of the page
+Quote Post
saratoga
post Jun 26 2012, 04:07
Post #3





Group: Members
Posts: 5047
Joined: 2-September 02
Member No.: 3264



QUOTE (GreenSeer @ Jun 25 2012, 22:39) *
Is there a reference or an explanation somewhere for what frequency SBR begins when using HE AAC?


SBR kicks in at 1/4th the sampling rate, so for 44.1khz audio its 11.025khz and above.
Go to the top of the page
+Quote Post

Posts in this topic
- GreenSeer   HE AAC Audio Quality & Tuning   May 23 2012, 15:39
- - Garf   Which codec? HE-AAC is a standard. There are seve...   May 23 2012, 15:54
|- - GreenSeer   QUOTE (Garf @ May 23 2012, 09:54) Which c...   May 23 2012, 18:59
- - IgorC   QUOTE (GreenSeer @ May 23 2012, 11:39) My...   May 23 2012, 17:31
|- - C.R.Helmrich   QUOTE (IgorC @ May 23 2012, 18:31) For HE...   May 27 2012, 11:03
- - IgorC   Chris, The Average scores are: Apple HE-AAC - 2....   May 28 2012, 16:22
|- - C.R.Helmrich   Awesome, thanks a lot, Igor! QUOTE (IgorC ...   May 29 2012, 20:47
|- - C.R.Helmrich   QUOTE (C.R.Helmrich @ May 29 2012, 21:47)...   Jun 22 2012, 16:00
|- - sluggy   QUOTE (C.R.Helmrich @ Jun 22 2012, 15:00)...   Jun 22 2012, 21:43
|- - benski   QUOTE (sluggy @ Jun 22 2012, 16:43) Hi i ...   Jun 22 2012, 21:56
|- - sluggy   QUOTE (benski @ Jun 22 2012, 20:56) QUOTE...   Jun 22 2012, 22:08
- - IgorC   Good news. Eagerly waiting to get home and try it....   Jun 22 2012, 19:45
- - GreenSeer   Is there a reference or an explanation somewhere f...   Jun 26 2012, 03:39
|- - saratoga   QUOTE (GreenSeer @ Jun 25 2012, 22:39) Is...   Jun 26 2012, 04:07
|- - C.R.Helmrich   QUOTE (GreenSeer @ Jun 26 2012, 04:39) Is...   Jun 26 2012, 17:20
|- - saratoga   QUOTE (C.R.Helmrich @ Jun 26 2012, 12:20)...   Jun 26 2012, 19:03
|- - C.R.Helmrich   QUOTE (saratoga @ Jun 26 2012, 20:03) I d...   Jun 26 2012, 19:32
- - benski   Side note: This is also the rationale behind the s...   Jun 26 2012, 20:11
- - GreenSeer   In my recent experience, there is a surprisingly l...   Jun 26 2012, 21:00
|- - IgorC   QUOTE (GreenSeer @ Jun 26 2012, 17:00) An...   Jun 27 2012, 01:17
|- - GreenSeer   I may try to do this if I can spare the time - are...   Jun 27 2012, 01:50
||- - db1989   QUOTE (GreenSeer @ Jun 27 2012, 01:50) ar...   Jun 27 2012, 06:34
|- - GreenSeer   Some time ago I've performed a personal blind...   Jun 30 2012, 01:03
- - lvqcl   The crossover frequency for Apple HE-AAC (CVBR 64 ...   Jun 27 2012, 00:26


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 25th October 2014 - 17:33