| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and system which enable a test signal inaudible to human passengers (and therefore unobtrusive) in an automobile that is used to determine the transfer function of a secondary path required for the FxLMS algorithm. <P>SOLUTION: Provided is a system for active control of an unwanted noise signal at a listening site radiated by a noise source where the unwanted noise is transmitted to the listening site via a primary path having a primary path transfer function. The system comprises: a loudspeaker for radiating a cancellation signal to reduce or cancel the unwanted noise signal, where the cancellation signal is transmitted from the loudspeaker to the listening site via a secondary path; an error microphone (E) at the listening site for determining through an error signal the level of achieved reduction; a first adaptive filter for generating the cancellation signal; and a reference generator for generating a reference signal. <P>COPYRIGHT: (C)2013,JPO&INPIT |
