Electrical audio signal processing systems and devices – Monitoring of sound – Amplification control responsive to ambient sound
Patent
1993-04-08
1995-07-18
Isen, Forester W.
Electrical audio signal processing systems and devices
Monitoring of sound
Amplification control responsive to ambient sound
381108, H03G 324
Patent
active
054349222
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.
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patent: 4837834 (1989-06-01), Allie
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Barish Jeffrey
Kantor Kenneth L.
Miller Thomas E.
Wise Duane K.
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