Active noise cancellation using frequency response control

(19)

(11)

EP 1 308 926 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	21.01.2004 Bulletin 2004/04

(43)	Date of publication A2:
	07.05.2003 Bulletin 2003/19

(21)	Application number: 02079479.8

(22)	Date of filing: 25.10.2002

(51)	International Patent Classification (IPC)⁷: G10K 11/178

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

30.10.2001 US 341026 P
15.10.2002 US 271440

(71)	Applicant: Siemens VDO Automotive Inc.
	Chatham, Ontario N7M 5M7 (CA)

(72)	Inventor:
	Vaishya, Manish Auburn Hills, Michigan 48326 (US)

(74)	Representative: Condon, Neil et al
	Intellectual Property Department, Siemens Shared Services Limited, Siemens House, Oldbury Bracknell, Berkshire RG12 8FZ Bracknell, Berkshire RG12 8FZ (GB)

(54)	Active noise cancellation using frequency response control

(57) An active noise cancellation system (20) includes using a frequency domain response of a secondary path (44) of the system. The frequency domain response information provides an indication of a desired magnitude and phase of a reference signal that is used for generating a cancellation signal that drives a speaker (28) to achieve the desired amount of noise cancellation. Using a frequency domain response greatly reduces the number of computations required and the amount of memory used within the system controller. In one example, a reference signal adjustment module (40) applies the desired magnitude and phase adjustments to a reference signal having a known frequency. In another example, the referenced signal tone generator (22, 40) incorporates the desired amplitude and phase in the reference signal.

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