[opendtv] MPEG Audio - was mac Mini
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: OpenDTV Mail List <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 28 Jan 2005 00:53:45 -0500
Posted at the request of Rob Koenen, who is not able to post form his
subscribed address at this time.
From: Rob Koenen
Sent: Thursday, 27 January, 2005 7:45
To: 'opendtv@xxxxxxxxxxxxx'
Subject: RE: [opendtv] Re: The New Mac Mini is All About Movies
OK, here's the deal.
MP3 started its life as MPEG-1 Layer III.
MPEG-1 Audio got incorporated into MPEG-2 as well, enhanced but backward
compatible to MPEG-1. So MP3 is also sort of MPEG-2 Layer III.
Then MPEG-2 added NBC Audio (Non Backward Compatible Audio) as a wholly
new part, much like AVC is MPEG-4 part 10.
NBC got renamed to AAC (Advanced Audio Coding) when the standard got its
final approval, and that's how the world knows it today.
Then AAC got added to MPEG-4, with some enhancements, again backward
compatible.
Then relatively recently, High Efficiency AAC got added as a profile.
Even ore recently, MPEG added parametric stereo to the mix, making AAC
even more powerful.
Rob
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