Desculpem postar tudo em inglês, mas é muita coisa
SURROUND SOUND-NOT JUST FOR HOME THEATERS ANYMORE
Consumers are surrounded-by surround sound, that is! A technology which became firmly established as part of the home theater experience is now moving out into new areas, in particular those of digital radio and MP3-based audio. Last December, the Fraunhofer Institute for Integrated Circuits IIS (Erlangen, Germany, www.iis.fraunhofer.de), Thomson (Stamford, CT, http://www.thomson.com/), and Agere Systems (Allentown, PA, www.agere.com) launched MP3 Surround into the consumer and commercial markets. This technology enables 5.1 channel surround sound for a broad spectrum of applications including web-based music distribution, broadcasting systems, PC-related audiovisual or gaming applications, consumer electronics and automotive systems. According to Fraunhofer, MP3 Surround supports high-quality multichannel sound at bit rates comparable to those currently used to encode stereo MP3 material, resulting in files half the size of common compressed surround formats. In addition, the new format offers complete backward compatibility to any existing MP3 software and hardware devices.
MP3 Surround was developed by Fraunhofer IIS in collaboration with Agere Systems. Using a psychoacoustic technique called binaural cue coding, MP3 Surround captures the spatial image information of multichannel sound (see the 11/8/04 edition of Radio TechCheck for more information). This method is critical in achieving the compact file size that MP3 users have come to expect. An evaluation encoder and player (see image) for this new format are available on the Internet at www.mp3surround-format.com. The evaluation encoder enables the creation of MP3 Surround material out of five or six channel ".wav" files. The Fraunhofer IIS MP3 Surround player is capable of decoding and playing back the surround format's files as well as stereo MP3 material. This software-only solution runs on any standard PC (also available for Macs) with multichannel audio capabilities. The evaluation period of the MP3 Surround encoder will expire on the 31st of December 2005, while the Fraunhofer IIS player will continue to remain fully functional. (The use of the software is allowed for personal and non-commercial purposes only. Professionals can license MP3 Surround from Thomson at www.mp3licensing.com.)
Surround sound promises to be a big item at this year's NAB show as well. In the exhibit hall at the "5.1 Pavilion," produced with RadioWorld, TV Technology, Audio Media and Pro Audio Review, leading companies who are currently developing and selling 5.1 products will be showcased. Also, as part of the 2005 NAB Broadcast Engineering Conference a session entitled "Surround Sound-a New Frontier for Radio" is being held on Sunday, April 17, 2005 from 10AM until noon in room N-110 of the Las Vegas Convention Center. During this session four papers will be presented:
- "The Killer App For FM: 5.1 Surround Sound," Frank Foti, President, Omnia Audio, Cleveland, OH-Frank will discuss the surround sound technology his company is developing for use with the iBiquity HD Radio system in conjunction with Fraunhofer (developers of MP3 Surround discussed above), a system that will provide distinct multichannel listening experience to the FM radio audience;
- "HDC Surround, 5.1 Surround over HD Radio," David Frerichs, VP and US General Manager, Coding Technologies, Mountain View, CA-in this presentation, David discusses "HDC Surround" which can be embedded in an IBOC transmission and provides full backwards compatibility with existing stereo broadcasts and radios. HDC Surround is based on spatial audio coding technologies developed by Coding Technologies and Philips, which have also successfully been submitted for standardization by MPEG;
- "5.1 & 2.0 Interspersion: A Reality," Robert Reams, CTO, Co-Founder and Chief Scientist, Neural Audio Corp, Kirkland, WA-Robert will talk about Neural's spatial compression and rendering methodology which allows a broadcaster to capture original source 5.1 content and "downmix" it to a 2.0 channel format while allowing the consumer to render the content in any spatial format they choose; mono, stereo, 3 channel stereo, quad, 5.1, 6.1, 7.1, up to 256 (!) channels;
- "The Surround Sound Program for Radio," Shigeru Aoki, R&D Engineer, The Japan FM Network, Chiyoda-ku, Tokyo, Japan-the Japan FM Network tackles the 5.1-surround radio program on both analog and digital broadcasting service with the intention of providing a rich listening experience all over Japan. Shigeru will present information on how his company is implementing 5.1 surround sound over analog FM as well as digital broadcast channels.