Kenneth J Kantor

US Patent:

54349222, Jul 18, 1995

Filed:

Apr 8, 1993

Appl. No.:

8/044643

Inventors:

Thomas E. Miller - Arlington Heights IL
Kenneth L. Kantor - Oakland CA
Jeffrey Barish - Boulder CO
Duane K. Wise - Boulder CO

International Classification:

H03G 324

US Classification:

381 57

Abstract:

This invention comprises a system to compensate for the noise level inside a vehicle by measuring the music level and the noise level in the vehicle through the use of analog to digital conversion and adaptive digital filtering, including a sensing microphone in the vehicle cabin to measure both music and noise; preamplification and analog to digital (A/D) conversion of the microphone signal; A/D conversion of a stereo music signal; a pair of filters that use an adaptive algorithm such as the known Least Mean Squares ("LMS") method to extract the noise from the total cabin sound; an estimation of the masking effect of the noise on the music; an adaptive correction of the music loudness and, optionally, equalization to overcome the masking effect; digital to analog (D/A) conversion of the corrected music signal; and transmission of the corrected music signal to the audio system.

US Patent:

56152701, Mar 25, 1997

Filed:

Jun 6, 1995

Appl. No.:

8/466411

Inventors:

Thomas E. Miller - Arlington Heights IL
Kenneth L. Kantor - Oakland CA
Jeffrey Barish - Boulder CO
Duane K. Wise - Boulder CO

Assignee:

International Jensen Incorporated - Schiller Park IL

International Classification:

H03G 324

US Classification:

381 57

Abstract:

This invention comprises a system to compensate for the noise level inside a vehicle by measuring the music level and the noise level in the vehicle through the use of analog to digital conversion and adaptive digital filtering, including a sensing microphone in the vehicle cabin to measure both music and noise; preamplification and analog to digital (A/D) conversion of the microphone signal; A/D conversion of a stereo music signal; a pair of filters that use an adaptive algorithm such as the known Least Mean Squares ("LMS") method to extract the noise from the total cabin sound; an estimation of the masking effect of the noise on the music; an adaptive correction of the music loudness and, optionally, equalization to overcome the masking effect; digital to analog (D/A) conversion of the corrected music signal; and transmission of the corrected music signal to the audio system.