Post-processing gains for signal enhancement

A program storage device readable by a machine, tangibly embodying a program of instructions executable by one or more processors of the machine for causing to perform operations, said operations comprising:

• receiving at least one audio signal,
• analyzing the at least one audio signal to determine a raw dynamic range control (DRC) gain, wherein the raw DRC gain depends on a level of the audio signal;
• selecting a raw DRC gain smoothing factor from a plurality of raw DRC gain smoothing factors in response to a comparison of the raw DRC gain to a previous smoothed DRC gain, wherein the plurality of raw DRC gain smoothing factors corresponds to a plurality of raw DRC gain smoothing time durations;
• determining, by employing a first order linear smoothing filter, a current smoothed DRC gain from the raw DRC gain, the previous smoothed DRC gain, and the selected raw DRC gain smoothing factor;
• and
• controlling a dynamic range of the audio signal by applying the current smoothed DRC gain to the audio signal.

A method, performed by an audio processing apparatus, the method comprising:

• receiving at least one audio signal,
• analyzing the at least one audio signal to determine a raw dynamic range control (DRC) gain, wherein the raw DRC gain depends on a level of the audio signal;
• selecting a raw DRC gain smoothing factor, from a plurality of raw DRC gain smoothing factors, in response to a comparison of the raw DRC gain to a previous smoothed DRC gain, wherein the plurality of raw DRC gain smoothing factors corresponds to a plurality of raw DRC gain smoothing time durations;
• determining, by a first order linear smoothing filter, a current smoothed DRC gain from the raw DRC gain, the previous smoothed DRC gain, and the selected raw DRC gain smoothing factor;
• and
• controlling a dynamic range of the audio signal by applying the current smoothed DRC gain to the audio signal.