Systems and methods for noise canceling

Abstract

Active Noise Cancellation (ANC) systems and methods that reduce latency to improve performance. In certain embodiments the systems sample a noise signal using a sample period to create a stream of digital signal data that is representative of the noise signal. A data transport layer carries the digital signal data to a signal processor. The transport layer temporally organizes the digital signal data to place the digital signal data within an initial phase of a sample period. The remaining phase of the sample period is set to a duration that allows the signal processor to process the digital signal data carried in the initial phase and to output the processed data during the same sample period. In this way, the processing of data occurs within one sample period and the latency is reduced and predictable.

Description

technical field [0001] The present disclosure relates to a system and method of canceling or reducing noise, and more particularly to a system and method of reducing or canceling noise. [0002] Cross References to Related Applications [0003] This application claims priority and benefit to US Provisional Patent Application Serial No. 61 / 864,974, filed August 12, 2013, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0004] For systems that include active noise cancellation (ANC) (among other things), the biggest challenge tends to be achieving low end-to-end system latency within the ANC system. Noise cancellation is most effective if the noise cancellation signal is simultaneously applied to the acoustic environment being monitored. An ANC system that delays the generation of the noise reduction signal has a limited ability to respond to and cancel the noise signal, and specifically, the higher frequency components of t...

AI Technical Summary

Problems solved by technology

However, dropping samples can introduce high-frequency sharp changes that need to be extracted to avoid fold-down noise

Typically, this requires the circuit to have a low-pass filter, and that filter adds a set of delays to the circuit

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