Patent ID: 9685921
Date: 2017-06-20
CPC Classifications: H03G

Claim:
1. A loudness control system configured to process an audio signal, the loudness control system comprising: a loudness measurement circuit configured to generate a short-term loudness estimate of the audio signal, wherein the audio signal includes content and noise; a noise detection circuit configured to produce a content-versus-noise classification of the audio signal indicating whether the audio signal is more likely to be content or more likely to be noise; a temporal smoothing circuit configured to adjust at least one smoothing factor based on the content-versus-noise classification to control a speed at which a gain correction circuit can increase a time-varying gain, and generate a long-term loudness estimate of the audio signal based on the short-term loudness estimate using the at least one smoothing factor; and the gain correction circuit configured to apply the time-varying gain to the audio signal based on the long-term loudness estimate.