System for reducing noise sounding in passenger compartment of v

Details System for reducing noise sounding in passenger compartment of v System for reducing noise sounding in passenger compartment of v

1992-04-14

1995-04-25

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

A61F 1106, H03B 2900

Patent

active

054106044

ABSTRACT:
A system for reducing a closed sound generated by propagation of vibrations into a limited space such as a vehicular compartment using at least one microphone and at least one speaker. In the closed sound reducing system, a volatile memory such as a RAM is installed for storing a measured newest value of a vibration propagation transfer function cfm(j) and a non-volatile memory such as a ROM is installed for storing a standard value of the vibration propagation transfer function. When the stored data of the volatile memory is erased, the standard value stored in the non-volatile memory is used in place of the measured newest value stored in the volatile memory.

REFERENCES:
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patent: 4677676 (1987-06-01), Eriksson
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Elliott et al. publication, vol. ASSP-35, No. 10, Oct. 1987 entitled "A Multiple Error LMS algorithm and its Application to the Act of Control of Error LMS Algorithm and its Application to the Act of Control of Sount and Vibration".

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