Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal

摘要

The invention relates to the measurement and control of the perceived sound loudness and/or the perceived spectral balance of an audio signal. An audio signal is modified in response to calculations performed at least in part in the perceptual (psychoacoustic) loudness domain. The invention is useful, for example, in one or more of: loudness-compensating volume control, automatic gain control, dynamic range control (including, for example, limiters, compressors, expanders, etc.), dynamic equalization, and compensating for background noise interference in an audio playback environment. The invention includes not only methods but also corresponding computer programs and apparatus.

主权项

1. A method for adjusting a perceived loudness of a digital audio signal, the method comprising:
deriving a plurality of scale factors for the digital audio signal to reduce a difference between the perceived loudness of the digital audio signal and a target loudness, each scale factor respectively operating in a frequency band of a plurality of frequency bands; and applying the plurality of scale factors to the digital audio signal to reduce the difference between the perceived loudness and the target loudness; wherein the perceived loudness varies both with frequency and acoustic level; wherein the method is performed by one or more computing devices.