| 词条 | MPEG-4 Structured Audio |
| 释义 |
It allows the transmission of synthetic music and sound effects at very low bit rates (from 0.01 to 10 kbit/s), and the description of parametric sound post-production for mixing multiple streams and adding effects to audio scenes. It does not standardize a particular set of synthesis methods, but a method for describing synthesis methods. The sound descriptions generate audio when compiled (or interpreted) by a compliant decoder. MPEG-4 Structured Audio consists of the following major elements:
MPEG-4 Structured Audio was cited by CNN as one of the top-25 innovations to arise at the Media Laboratory.[6] See also
References1. ^{{cite web | url=http://www.iso.org/iso/iso_catalogue/catalogue_ics/catalogue_detail_ics.htm?csnumber=25035 | title=ISO/IEC 14496-3:1999 - Information technology -- Coding of audio-visual objects -- Part 3: Audio | author=ISO | publisher=ISO | year=1999 | accessdate=2009-10-06}} 2. ^{{citation | url=ftp://ftp.tnt.uni-hannover.de/pub/MPEG/audio/mpeg4/documents/w2203/w2203sa.pdf | title=ISO/IEC FCD 14496-3 Subpart 5 - Information Technology - Coding of Audiovisual Objects – Low Bitrate Coding of Multimedia Objects, Part 3: Audio, Subpart 5: Structured Audio, Final Committee Draft, N2203SA | format=PDF | author=ISO/IEC JTC 1/SC 29/WG 11 | publisher= | date=1998-05-15 | accessdate=2009-10-10}} 3. ^{{cite web | url=http://www.chiariglione.org/mpeg/faq/mp4-aud/mp4-aud.htm | title=MPEG Audio FAQ Version 9 - MPEG-4 | author=D. Thom, H. Purnhagen, and the MPEG Audio Subgroup | publisher=chiariglione.org | date=October 1998 | accessdate=2009-10-06 | archive-url=https://web.archive.org/web/20090926231123/http://www.chiariglione.org/mpeg/faq/mp4-aud/mp4-aud.htm | archive-date=2009-09-26 | dead-url=yes | df= }} 4. ^{{cite web | url=http://140.130.175.70/html/mpeg4/sound.media.mit.edu/mpeg4/audio/general/index.html#aes106 | title=The MPEG-4 Audio Standard: Overview and Applications | author=Heiko Purnhagen | publisher=Heiko Purnhagen | date=2001-06-01 | accessdate=2009-10-07}} {{Dead link|date=October 2010|bot=H3llBot}} 5. ^ {{cite paper | last1 = Scheirer | first1 = Eric D. | last2 = Ray | first2 = Lee | title = Algorithmic and Wavetable Synthesis in the MPEG-4 Multimedia Standard | url = http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.35.2773&rep=rep1&type=pdf | periodical= Audio Engineering Society Convention 105, 1998 | publication-date = 1998 | quote = 2.2 Wavetable synthesis with SASBF: The SASBF wavetable-bank format had a somewhat complex history of development. The original specification was contributed by E-Mu Systems and was based on their “SoundFont” format [15]. After integration of this component in the MPEG-4 reference software was complete, the MIDI Manufacturers Association (MMA) approached MPEG requesting that MPEG-4 SASBF be compatible with their “Downloaded Sounds” format [13]. E-Mu agreed that this compatibility was desirable, and so a new format was negotiated and designed collaboratively by all parties. }} 6. ^{{cite news | url=http://newsroom.blogs.cnn.com/2010/10/12/the-big-i-mit-media-lab-turns-25/ |title=THE BIG I: MIT Media Lab Turns 25 | work=CNN}} External links
1 : MPEG-4 |
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