US 11,394,356 B1 · Block-based audio limiter

Abstract

A system configured to perform audio limiting using block-based processing to reduce acoustic distortion and/or computational cost. While sample-by-sample processing would apply a plurality of gain ramps to a single audio sample, the block-based processing applies a single gain ramp to ensure that the audio sample is below a threshold value. To perform block-based processing, an audio limiter component identifies a maximum amplitude value across all channels for a selected audio frame of an audio signal. Using the maximum amplitude value and the threshold value, the audio limiter component determines a block gain value associated with the selected audio frame and selects between attack processing, hold processing, or release processing. Using the selected processing and the block gain value, the audio limiter component determines instantaneous gain values for the audio samples within the audio frame.

Claims20

Dependent claims

A computer-implemented method, the method comprising:

receiving first audio data;
determining a first maximum amplitude value associated with a first plurality of audio samples within the first audio data, the first plurality of audio samples corresponding to a first time window;
determining that the first maximum amplitude value exceeds a threshold value;
determining a first gain value based on the threshold value and the first maximum amplitude value;
determining a first plurality of gain values using the first gain value;
and
generating second audio data using the first plurality of gain values and the first plurality of audio samples.

4 more elements

A system comprising:

at least one processor;
and
memory including instructions operable to be executed by the at least one processor to cause the system to:
receive first audio data;
determine a first maximum amplitude value associated with a first plurality of audio samples within the first audio data, the first plurality of audio samples corresponding to a first time window;
determine that the first maximum amplitude value exceeds a threshold value;
determine a first gain value based on the threshold value and the first maximum amplitude value;
determining a first plurality of gain values using the first gain value;
and
generate second audio data using the first plurality of gain values and the first plurality of audio samples.

7 more elements

Dependencies are inferred from the claim text.

Block-based audio limiter

Life of this patent

Block-based audio limiter

Life of this patent

Abstract

Claims20