Loudness-based audio-signal compensation
AssigneeGuoguang Electric Company Limited
InventorYuli You
Life of this patent
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Abstract
Provided are, among other things, systems, methods and techniques for loudness-based audio-signal compensation. According to one such system, an input line accepts an input audio signal; a loudness estimator, coupled to the input line, processes the input audio signal to obtain an audio playback loudness level and also provides a production loudness level for the input audio signal; and a filter generator/selector coupled to an output of the loudness estimator provides an audio compensation filter based on the production loudness level and the audio playback loudness level. The input signal is processed by the audio compensation filter to provide an output signal.
Claims30
A system for loudness-based audio-signal compensation, comprising:
- (a) a first input that accepts an input audio signal;
- (b) a second input that accepts at least one control signal, representing an audio playback loudness level and a production loudness level for the input audio signal;
- (c) a filter generator/selector, coupled to the second input, that provides an audio compensation filter having a frequency response that is based on both the production loudness level and the audio playback loudness level,
- wherein the frequency response of the audio compensation filter changes over time based on corresponding changes in at least one of the production loudness level and the audio playback loudness level,
- wherein the input audio signal is processed by the audio compensation filter to provide an output signal, and
- wherein the loudness estimator provides the audio playback loudness level by first band-pass filtering an input signal to obtain a band-pass filtered signal and then estimating the audio playback loudness level from the band-pass filtered signal.
Dependencies are inferred from the claim text.