By W. Gessner, A. Hilbert, Th. Köhler, D. E. Ricken (auth.), Dr. Detlef Egbert Ricken, Wolfgang Gessner (eds.)

Microsystems are an enormous good fortune consider the car undefined. which will fulfil the purchasers requests for security comfort and automobile economic climate, and to fulfill environmental requisites, microsystems have gotten essential. hence a good number of microsystem purposes got here into the dialogue. With the foreign convention AMAA '99, VDI/VDE-IT offers a platform for the dialogue of all MST appropriate elements for car purposes. The convention complaints assemble the papers via authors from motor vehicle providers and manufacturers.

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Advanced Microsystems for Automotive Applications 99

Microsystems are a huge good fortune think about the auto undefined. with a view to fulfil the shoppers requests for defense comfort and automobile economic climate, and to meet environmental specifications, microsystems have gotten necessary. hence a great number of microsystem functions got here into the dialogue.

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For example: Leather reflects sound waves to a greater extent in comparison to absorbing textiles. 6dB SPL) 2 Headliner 44cm (ref. 1 • Possible microphone locatIOns I~. 52 R. 4 Enhance speakers voice by microphone directivity Once the best place is identified, the directivity of the microphone should be optimized. Omnidirectional microphones have a constant sensitivity over all angular directions. With that, they pick up all random noise - so their random energy efficiency is 1 (OdB). In order to improve signal to noise ratio of the acoustic path, microphones should have maximum sensitivity in the direction to the speaker and minimum sensitivity to all noise sources.

15) are the best choice because they allow to supress loud single noise sources like defog or climate control openings by turning the position of the null into their direction. Sensitivity to the speaker remains quite reasonable by this strategy. o 280 80 a-t/--+--t---J 90 270 f----+--f---lM 260 100 180 Fig. 8dB) Advanced microphones for Handsfree Communication 180 Fig. 8dB) o 280 80 260 100 MIN=250 250 180 Fig. 0dB) 53 54 R. 16). The right choice is always a trade off between cost and performance.

A USB microcontroller can be connected to a car bus controller to create a car bus gateway. This gateway provides a means of the car electronics and the PC to interact. 5 Telephony People like to use their telephones in the car. Connecting them to a CarPC system can make them easier and safer to use. The user interface of the computer with its large buttons and speech recognition software can improve the car phone experience. Messaging and fax services may also be provided. To offer all of this functionality the CarPC and telephone must be connected.

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