Automotive sound system

Details Automotive sound system Automotive sound system

H - Electricity

04

R

179/10, 179/9

H04R 3/12 (2006.01) H03G 5/02 (2006.01) H04R 3/04 (2006.01)

Patent

CA 1293931

ABSTRACT An automotive sound system has a pair of front channels and a pair of rear channels. The channel are coupled to a source of program material. Each channel also has an input stage, a second stage and multiple, independently selectable circuits pro- viding equalization poles. One or more of the multiple equaliza- tion pole-providing circuits is independently and selectively coupled to the input stage and to the second stage. Each channel has a filter having a variable lower corner frequency coupled to the second stage, and has a control input terminal. Each channel also has an amplifier coupled to the variable corner frequency filter, a transducer coupled to the amplifier and a low-pass filter circuit, coupled to the amplifier, for generating a feedback signal. The low-pass filter circuit is coupled to the control input terminal of the variable corner frequency filter, the low- pass filter circuit controlling the variable lower corner frequency. The invention makes use of psychoacoustic contouring and provides full frequency range reproduction without having to adjust the system playback level to the level of the original performance.

546138

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