In This Section
- Acoustics and Sound Reinforcement
- Archiving Restoration and Digital Libraries
- Audio for Games
- Audio for Telecommunications
- Audio Forensics
- Automotive Audio
- Coding of Audio Signals
- Electro Magnetic Compatibility
- Fiber Optics for Audio
- Hearing and Hearing Loss Prevention
- High Resolution Audio
- Human Factors in Audio Systems
- Loudspeakers and Headphones
- Microphones and Applications
- Network Audio Systems
- Perception and Subjective Evaluation of Audio Signals
- Recording Technology and Practices
- Semantic Audio Analysis
- Signal Processing
- Sound for Digital Cinema and Television
- Spatial Audio
- Transmission and Broadcasting
AES Technical Committee
Chair: Richard S Stroud (Send Email) Vice Chair: Tim Nind (Send Email)
The Mission of this committee is to:
- Encourage the development of technical papers workshops, tutorials, master classes and poster sessions in the field of automotive audio
- Promote awareness of new trends and developments that may impact Automotive audio
- Encourage technical communications within the vehicular audio community
- Propose the development of new automotive audio standards
- Create an awareness within the larger audio community of the engineering challenges and excellence of premium vehicular audio
- Discuss unique applications of audio transducers into the automotive environment
Areas of Concentration
- Automotive Transducers
- Vehicular System Design
- Objective System Evaluation
- Subjective System Evaluation
- New Audio Sources
- Automotive Mulitchannel Sound
- Noise production and cancellation
137th AES Convention in Los Angeles: Meeting of AES Technical Committee for Automotive Audio
Automotive Audio Conference in California being considered
Automotive Audio Trends
1. Vehicles with built-in Internet capability (via high speed phone connection, etc.) could present numerous music and talk selections at higher quality than most other data-reduced sources. At least one OEM is working on personal audio to allow people to have the same data & source material they have at home in the car. Connectivity may be based on the user's mobile phone. Some OEM's are considering using a dedicated server to control quality.
The current mobile phone system would be burdened to near unusablilty by a high percentage of customers using a large number of music channels, so minimizing station selection, data reduction and speeds beyond 4G will likely be necessary. This is especially true in urban areas at current cell tower density levels.
There is, however, a growing number of people that are using this kind of service with little difficulty. The though that this will replace FM, AM, Satellite and CD has occurred to some persons and others see this is unlikely and at least premature.
2. Premium receivers are beginning to appear that do not include CD players. Increasingly larger USB drives are becoming a primary music storage medium, along with bluetooth-connected smart phones with their often large music libraries.
3. There is an interest in providing sounds for very quiet cars such as electric vehicles. These include "engine start" and "engine running" sounds for inside the vehicle and pedestrian safety sounds for outside the vehicle. This was a major discussion topic at the Munich AA Conference.
4. SSD's are replacing mechanical hard drives as preferred storage when cost permits.
5. Objective measurement is still battling subjective listening tests as a final authority for OEMs. SPL vs. distortion measurements are quite good now, and directionally correct frequency response measurements are improving. Spatial measurement capability has been developed and evaluated.
6. Trends towards higher performance audio systems is in direct conflict with recent trends of cost and weight reduction of components in automobiles. Increased application of neodymium magnets may help.
7. Neodymium metal costs are still high and are variable. As of this writing, they are falling. Current price is around $55/kg (China). It is risky for a supplier to quote neodymium speakers because of price variability.
With high neo prices, speaker customers need a strong set of specifications to insure that suppliers maintain speaker sensitivity and Xmax.
8. Planar style speakers are now found in vehicles. These are not totally flat, but have profiles of 10 mm or less. Some examples have shown very low sensitivity.
9. HD radio components are now for sale. In the US, AM HD radio offers much higher fidelity and FM HD offers additional program sources. Because of the fidelity difference on AM, rapid switching in fringe areas must be carefully managed. Spectral compression artifacts are mentioned with HD AM.
10. "Surround sound" is almost mandatory in high-end automotive systems, even when the source is limited to two-channel (via upmix algorithms). Some listeners sense that some surround systems provide limited envelopment on both stereo and most "surround" source material.
11. There is almost universal branding of audio systems in luxury cars. Newer brands are emerging. The maximum number of speakers used in luxury vehicle systems seems to be leveling out at 18 ± 2.
12. Voice recognition systems for telephone and navigation functions are now quite sophisticated and enjoy wide application.
13. Active noise cancellation by the audio system is being used for exhaust drone under condition of cylinder deactivation.
14. Active road noise bass and/or level compensation now enjoy a widespread market presence. Basic versions are available in many OEM head units while some high-end premium systems have more sophisticated implementations.
Simple systems use the speedometer signal to apply predefined loudness curves. Others use microphones to measure the current cabin noise, after separating the music, allowing more targeted equalization or bass/level compression to be applied.
15. Switching audio is now common in automotive amplifiers. Switching audio cost are becoming comparable with older AB amplifiers, as the heat sink requirement is minimized. Important for electric vehicles is the low current draw under most all audio power output conditions.
16. Aftermarket audio now represents a very small part of the automotive audio market. OEM head unit and speaker reliability is comparatively good, and performance of OEM systems is often quite good enough for most listeners.
17. Rear seat audio performance may be important in China and other countries, as some who can afford automobiles can also afford drivers.
18. There are still parts of the world where 5.1 and high-level premium audio are not featured in most vehicle's audio lineups. These systems can take advantage of inexpensive, powerful audio DSP systems to improve performance.
19. Audio system designers are frustrated by performance differences between concept vehicles and production implementations. Reasons for differences include sealing issues, material changes, structure differences, etc. Even 1-2 dB differences in side to side acoustic balance can degrade spatial performance.
Strategies to address this issue include tightening specification, but this is unlikely to completely solve this problem. Post-manufacturing re-equalization could also help, if a good way to do this can be found. This issue was discussed in Munich.
20. Modern surround sound encoding algorithms use metadata to send 5.1 information in about the same bandwidth as stereo information. Offerings include Dolby Digital Plus, DTS Neural Surround and MPEG Surround (MPEG-2 TS. I think), This could kindle more interest in surround sound. One hopes that surround offerings become somewhat standardized, but production standards may not exist.
These documents do not necessarily express the official position of the AES on the issues discussed at these meetings, and only represent the views of committee members participating in the discussion. Any unauthorized use of these publications is prohibited. Authorization must be obtained from the Executive Director of the AES: Email, Tel: +1 212 661 8528, Address: 551 Fifth Ave., Suite 1225, New York, New York 10176, USA.
2005-5-23 Meeting Minutes AATC 117th
Description: Technical Committee Meeting on Automotive Audio 28 Oct 2004
2004-6-22 Minutes of Automotive Audio TC, 116th
Description: This document contains minutes of the Automotive Audio Technical Committee meeting at the 116th Convention in Berlin.
2004-4-17 Minutes of Automotive Audio TC, 115th
Description: Minutes of the 115th Automotive Audio Technical Committee in New York
Allan Phillips Angelo Farina Arndt Hensgens Dave Baehr David Clark David Dage David Navone Earl Geddes Eric Benjamin Floyd Toole Garry Feeley Jayant Datta Jim Hunter Jim Stratman John Busenitz John Stewart Jyri Huopaniemi Karlheinz Brandenburg Mark Ziemba Marshall Buck Mike Harris Peter Mapp Richard S Stroud Richard Small Robert Franks Robert Schulein Ryan Mihelich Scott Orth Sean Olive Soren Bech Spiro Iraclianos Stan Smith Steve Hutt Thomas Sporer Tim Nind Tom Heed Tom Nousaine W.A. Deutsch Kenneth Deetz Kevin Heber Stel Anthony Wolfram Jaehn Jonathan Lane Tim Richardson Steve Hoshaw K. C. Furge Alan Trevena Nigel Fletcher Siegmund Schreiber Timo Esser Bradley Eid Hebert Etzel Wolfgang Klippel Tyrone Hunter Edgar Kirk Brian Sterling Michael Noll Brent Karley Wontak Kim Doug Hunley Raymond Seymour Mark Kalman Lin Lin Joe D'Angelo Martin Lindsay Viv Railton Dave Wilson Tom Breithaupt Hans-Juergen Nitzpon William L Martens Natanya Ford Rafael Kassier Kim Rishoej Matthias von Saint-George Gerhard Pfaffinger David Carlstrom Matthew Watson Bernard Fox Varuni Witana Josh King Laurie Fincham Jean-Philippe Dupire Phil Muzio Robert Sloan Todd Welti Phil Simpkins John Yungman Jason Kemmerer Brett Hanes Timothy Jackson Jeff Koch Steve Swanson Todd Rockwell Michael Truman Jay Krusac Reinhard Gretzki Brian Knauss Philipp Krejci Ruediger Fleischer Kristina Busenitz Phil May Tom Conlin Glenn Cass Richard Clark Roy Delgado Jon Zenor Roger Kessler Ken Kantor Mae Nutley Morten Lydolf Armin Hoh Jonathan Pierce Andreas Suess Vitor Soares Roger Shively Peter Perzlmaier Volker Hochwald Markus Christoph Niyati Desai Ed Maniet Kelvin Griffiths Thomas Gmeiner Marcus Koch Sergio Liberman Christopher Matthews Sean Thomson Christophe Macours Jeff Bailey Rob Barnicoat Toby Newman Tyler Walker Robert Hewitt Wolfgang Hess Guy A. Torio Hans Lahti Michael Cozza Armin Prommersberger Michael Strauss Shinichi Sato Stefan Holzhäuser Arnold Knott Tadeo Spraggon-Hernandez Jurgen Gach Christian Schmidberger Chen Chienhao Tom Ammermann George Weaver Peter Primo Leonard Kreitmeier Hans Juergen Regl Adrian Cartllidge Matt Jones Robert Klacza Krestian Pedersen Marco Castro Matt Ruhlen Steffen Bergweiler Shinji Koyano Barry Moskowitz Pat Dennis Carsten Schulz Andreas Fritsch Benedetto Altieri Michael Adenauer Piergiovanni Bazzana Tobias Warmbrunn Christian Tasch Thomas Beer Imre Csonka Dirk Thomschke Christopher Herold Stefan Behr Ronald Schulz Paul Beckmann john Feng Alfred Svobodnik Kevin Bastyr Rifky Cahyadi Jan Pedersen Toni Treichel Deersheet Mehta Luke Blaszczynski Neil Pedinoff Tom Morrow Soonkwon Paik Sachin Karajagi Frederico Conte Juliano Medeiros Nazrizal A. Tajuddin Seno Adi Wibowo Fré Jorritsma Emanuele Ugolotti Gregory Sikora Toy Zhang Jakub Honkisz Martin Berg Thomas Guignard Oliver Alic Kai Inha Patrick James Hegarty Simon Woolard Lena Schell-Majoor Florian Rill Stefan Varga Thomas Bachmann Jeff Tackett Sandra Brix Robert Hartman Patrick Putzolu
To request membership in this Technical Committee please email the Chair by using the link above.