Low latency active noise cancellation system

摘要

Systems and methods described herein provide for low latency active noise cancellation which alleviate the problems associated with analog filter circuitry. The present technology utilizes low latency digital signal processing techniques which overcome the high latency conventionally associated with conversion between the analog and digital domains. As a result, low latency active noise cancellation is performed utilizing digital filter circuitry which is not subject to the inaccuracies and drift of analog filter components. In doing so, the present technology provides robust, high quality active noise cancellation.

主权项

1. A method for reducing an acoustic energy level at a listening position, the method comprising:
receiving a primary acoustic wave at a reference position to form an analog reference signal; converting the analog reference signal into a digital reference signal at a first sample rate using an oversampling data converter, the oversampling data converter being for receiving the analog reference signal and converting the analog reference signal into the digital reference signal at the first sample rate; forming a digital noise reduction signal based on the digital reference signal; converting the digital noise reduction signal into an analog noise reduction signal; and generating a secondary acoustic wave based on the analog noise reduction signal, the secondary acoustic wave adapted to reduce the acoustic energy level at the listening position.