In recent years the level of features and sound quality in car audio equipment has been rising remarkably. However in vehicle the driver often adjusts audio volume in response to velocity because audio outputs are masked with engine noise, road noise, wind noise and so on. The automatic volume set system which uses a speed sensor was already presented, bur it couldn't make natural sound due to noise level changes from the accelerator status, road surface and window and so on. The new system named kfz-elektAutomatic Sound Levelizer (ASL)' uses a microphone to sense the real noise level in vehicle and according to music level it controls volume and frequency characteristics using DSP and a volume control IC. This system senses the subsonic band, where most vehicle noise has some ingredient, and avoids unstable movements such as positive feedback by sensing the output sound. The authors have tuned the system by examining various road and drive conditions all over the world and have realized a comfortable vehicle audio system.
Automatic sound levelizer system
Advances in Automotive and Transportation Technology and Practice for the 21st Century, ISATA, ISATA, 32 ; Automotive electronics and new products ; 211-217
1999
7 Seiten, 10 Bilder
Aufsatz (Konferenz)
Englisch
Automatic sound levelizer system
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