Near-field noise cancellation

摘要

Systems and methods for cancelling a near-field noise signal. The methods generally involve: receiving (604), from a first acoustic sensing device (120), a first signal (214) comprising a near-field noise signal (206); synthesizing (320, 420, 520, 606) a replica signal (322, 422, 522) which replicates the near-field noise signal; and communicating (608) the replica signal and the first signal to a far-field noise cancellation process (150). Prior to communicating the replica signal to the far-field noise cancellation process, at least one characteristic of the replica signal is controlled (606) so that the far-field noise cancellation process will identify the near-field noise signal as far-field noise. The far-field noise cancellation process cancels (610) the near-field noise signal and generates (612) an output signal (360, 460, 560) in which the near-field noise signal is reduced in amplitude.

主权项

1. A method for reducing an interference of a near-field noise signal with a select near-field sound, the method comprising:
receiving, from a first acoustic sensing device, a first electronic signal comprising the select near-field sound signal and the near-field noise signal including near-field noise originating from at least one first sound source located relatively proximal to the first acoustic sensing device as compared to a second sound source from which a far-field noise originates; analyzing the first electronic signal to detect the near-field noise signal based on a known recognizable acoustic signature or pattern of the first sound source which was known prior to the near-field noise's origination; generating a replica signal when a presence of the near-field noise signal is detected within the first electronic signal, where the replica signal is a replica of the near-field noise signal; controlling at least one characteristic of the replica signal so as to cause a far-field noise cancellation process to consider the corresponding near-field noise as constituting far-field noise; communicating said replica signal to a first input of a far-field noise cancellation process and said first electronic signal to a second input of the far-field noise cancellation process, where the far-field noise cancellation process is designed to cancel far-field noise from audio signals while preserving near-field sound; and generating an output signal of said far-field noise cancellation process in which said near-field noise signal is reduced in amplitude whereby the interference thereof with the select near-field sound signal is also reduced.