System and method for actively influencing sound

US9978356B2 · kind B2 · utility

Assignee

• Eberspächer Exhaust Technology GmbH · DE

Inventors

• Viktor Koch · Plochingen, DE
• Federico Buganza · Stuttgart, DE

Key dates

• Filing date: Apr 5, 2017
• Grant date: May 22, 2018
• Expiry date: Apr 5, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G10K2210/3044
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A system includes a sound generator (20) that generates sound superimposed to sound to be manipulated. An error sensor (50) measures superimposed sound and outputs a corresponding feedback signal (e′(n)). A signal generator (91) generates a sound signal (y(n)). A controller (92) generates a control signal (λ(n)) representing a value of a sequence of rational numbers. A weighter (93) weights the generated sound signal (y(n)) with the control signal (λ(n)) and inverts it. An adder (94) adds the weighted/inverted sound signal to the feedback signal (e′(n)) and outputs a modified feedback signal (e(n)) to the signal generator (91). A weighter (95) weights the generated sound signal (y(n)) with the difference from one and with the control signal (λ(n)) and outputs the sound signal y′(n). The generated sound signal (y(n)) is a function of the modified feedback signal (e(n)).