20240054988. Reduced Complexity Implementation for Acoustic Noise Canceling simplified abstract (GOOGLE LLC)

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Reduced Complexity Implementation for Acoustic Noise Canceling

Organization Name

GOOGLE LLC

Inventor(s)

Abhijit Shah of Foster City CA (US)

Guohua Sun of Santa Clara CA (US)

Lawrence Frederick Heyl of Williston VT (US)

Niel David Warren of Soquel CA (US)

Reduced Complexity Implementation for Acoustic Noise Canceling - A simplified explanation of the abstract

This abstract first appeared for US patent application 20240054988 titled 'Reduced Complexity Implementation for Acoustic Noise Canceling

Simplified Explanation

The subject matter of this patent application is a system and technique for filtering audio signals using active noise cancellation (ANC). The conventional ANC system typically uses a channel response finite impulse response (CR FIR) filter, which is replaced in this innovation with a two-filter cascade configuration.

  • The first filter in the cascade configuration is a CR FIR filter with interleaved zero coefficients.
  • The second filter in the cascade configuration is a fixed interpolator filter.
  • The CR FIR filter in the cascade is adaptive and can track, update, adapt, and compute its non-zero coefficients.
  • The fixed interpolator in the cascade is non-adaptive and remains fixed.
  • The channel frequency response profile of the two-filter cascade configuration is similar to the profile of the conventional CR FIR filter it replaces.

Potential applications of this technology:

  • Noise cancellation in audio devices such as headphones, earphones, and speakers.
  • Enhancement of audio quality in communication systems, such as teleconferencing or voice recognition systems.
  • Noise reduction in automotive audio systems.

Problems solved by this technology:

  • Reduction of unwanted background noise in audio signals.
  • Improvement of audio clarity and intelligibility in noisy environments.
  • Enhanced user experience by providing a more immersive and enjoyable audio listening environment.

Benefits of this technology:

  • Improved audio signal quality by effectively canceling out unwanted noise.
  • Enhanced communication and speech recognition accuracy in noisy environments.
  • Increased user satisfaction and comfort by providing a more immersive and enjoyable audio experience.


Original Abstract Submitted

the subject matter described herein provides systems and techniques for filtering an audio signal using active noise cancellation (anc). a channel response finite impulse response (cr fir) filter in a conventional anc system may be replaced with a two filter cascade configuration. the first filter in the cascade filter configuration may be a cr fir filter with interleaved zero coefficients and the second filter may be a response interpolator filter that is a fixed interpolator. the cr fir filter in the two filter cascade may be adaptive and may have its non-zero coefficients tracked, updated, adapted, and/or computed. the fixed interpolator in the two filter cascade may be fixed and therefore non-adaptive. the channel frequency response profile of the two filter cascade configuration may be similar to the channel frequency response profile of the conventional cr fir filter that the cascade filter configuration replaces.

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