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SMPTE Journal ( Volume: 109, Issue: 4, April 2000)
[ACTIVE]

Digital Audio Delivery to the Consumer

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
SMPTE J
Volume
109, No. 4, pp. 301–308
Abstract
Dolby Digital is a system for coding up to 5.1 channels of audio into a low bit rate data stream intended to deliver audio to the consumer. High quality is obtained with compression ratios approaching 12:1 for multichannel audio programs. The high-compression ratio is achieved by methods that do not increase decoder memory and, thus, cost. The methods employed include transmission of a high-frequency resolution spectral envelope and a novel forward/backward adaptive bit allocation algorithm. In order to satisfy practical requirements of an emissions coder, the syntax includes a number of features useful to broadcasters and consumers: loudness uniformity between programs; dynamic range control; and broadcaster control of downmix coefficients. Optimum application of the system involves the creation and delivery of metadata describing dialogue loudness and intended dynamic range.
Publication Date
2000-04-01
DOI
10.5594/J05366
ISSN
Print: 0036-1682
Link
https://doi.org/10.5594/J05366
Author(s)
Steve LymanSteve Lyman and Craig Todd are with Dolby Laboratorie, San Francisco
bio
Steve Lyman began his career designing custom audio equipment for a recording studio and for a console manufacturer. He joined the Canadian Broadcasting Corp. in 1980 and developed a system of standard audio and video measurement techniques. He was heavily involved with CBC's efforts to implement HDTV, digital audio broadcasting, and other new technologies. In 1996, he moved to the Research and Business Development department of Dolby Laboratories to help implement multichannel audio systems for digital television broadcasting. Lyman, a Fellow of the AES has been involved in the development of audio and video standards within that Society, the IEEE, and SMPTE throughout his career.
Craig ToddSteve Lyman and Craig Todd are with Dolby Laboratorie, San Francisco
bio
Craig Todd, currently senior member of the technical staff, has been with Dolby Laboratories for more than 20 years, He has been involved with the development of multichannel sound for over 20 years, beginning with his work on the Dolby Surround Sound matrix system. More recently he has worked on the development of technology for digital audio coding and broadcasting. For the last several years, Todd has concentrated on multichannel digital audio for television. The result of his efforts is the Dolby Digital (AC-3) coding technology, and its acceptance, by the U.S. HDTV Grand Alliance and the FCC Advisory Committee, for incorporation into the U.S. HDTV broadcast standard. Todd is active in many standards activities, including ATSC, DVB, IEC, AES, ITU, CEMA, and SMPTE. He is a Fellow of the AES, and is currently Chairman of ITU-R Working Party 10C.
Copyright
© 2000 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

  • Advanced Television Systems Committee , “Digital Audio Compression (AC-3),” Dec. 20, 1995 . EXTERNAL
  • Advanced Television Systems Committee , “Guide to the Use of the ATSC Television Standard,” Oct. 4, 1995 . EXTERNAL
  • Fielder L. , U.S. Pat. No. 5109417, 1992 . EXTERNAL
  • ITU-R Rec. BS.775-1, “Multichannel Stereophonic Sound System With and Without Accompanying Picture,” 1994 . EXTERNAL
  • ITU-R Rec. BS. 1996 , “Audio Coding for Digital Terrestrial Television Broadcasting,” 1995. EXTERNAL
  • Princen Bradley , IEEE Trans. ASSP , Vol 34 , No. 5 , pp 1153 – 1161 , 1986 . EXTERNAL
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Steve Lyman and Craig Todd; Digital Audio Delivery to the Consumer, SMPTE Journal ( Volume: 109, Issue: 4, April 2000); SMPTE, 2000. Available at https://doi.org/10.5594/J05366
Snippet:
Steve Lyman and Craig Todd; Digital Audio Delivery to the Consumer, SMPTE Journal ( Volume: 109, Issue: 4, April 2000); SMPTE, 2000. Available at https://doi.org/10.5594/J05366

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Steve Lyman and Craig Todd; Digital Audio Delivery to the Consumer, SMPTE Journal ( Volume: 109, Issue: 4, April 2000); SMPTE, 2000. Available at https://doi.org/10.5594/J05366
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<span class="citation">Steve Lyman and Craig Todd; <cite>Digital Audio Delivery to the Consumer</cite>, SMPTE Journal ( Volume: 109, Issue: 4, April 2000); SMPTE, 2000. Available at <a href="https://doi.org/10.5594/J05366" target="_blank" rel="noopener">https://doi.org/10.5594/J05366</a></span>

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Steve Lyman and Craig Todd; Digital Audio Delivery to the Consumer, SMPTE Journal ( Volume: 109, Issue: 4, April 2000); SMPTE, 2000
doi: 10.5594/J05366
url: https://doi.org/10.5594/J05366
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<li>
Steve Lyman and Craig Todd; <cite id="bib-10-5594-j05366">Digital Audio Delivery to the Consumer</cite>, SMPTE Journal ( Volume: 109, Issue: 4, April 2000); SMPTE, 2000
<span class="doi">10.5594/J05366</span>
</li>