138 What happened at the MPEG - NY meeting? MPEG-2 Audio
Description
This article is from the MPEG FAQ, by Frank Gadegast phade@cs.tu-berlin.de with numerous contributions by others.
138 What happened at the MPEG - NY meeting? MPEG-2 Audio
MPEG is developing the MPEG-2 Audio Standard for low bitrate coding of
multichannel audio. MPEG-2 Audio coding will supply up to five full
bandwidth channels (left, right, center, and two surround channels), plus
an additional low frequency enhancement channel, and/or up to seven
commentary/multilingual channels. The MPEG-2 Audio Standard will also
extend the stereo and mono coding of the MPEG-1 Audio Standard (ISO/IEC
IS 11172-3) to half sampling-rates (16 kHz, 22.05 kHz, and 24 kHz), for
improved quality for bitrates at or below 64 kbits/s, per channel.
This week in New York, MPEG produced an updated version of the MPEG-2
Audio Working Draft, and is on track for achieving a Committee Draft
specification by the November MPEG meeting.
The MPEG-2 Audio multichannel coding Standard will provide
backward-compatibility with the existing MPEG-1 Audio Standard
(ISO/IEC IS 11172-3). Together with ITU-RS, MPEG is organizing formal
subjective testing of the proposed MPEG-2 multichannel audio codecs and
up to three non-backward-compatible (NBC) codecs. The NBC codecs are
included in order to determine whether an NBC mode should be introduced
as an addendum to the standard. If the results show clear evidence that an
NBC mode improves the performance, a formal call for NBC proposals will
be issued by MPEG, with a view to incorporate these features in the audio
syntax.
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