Frequency-domain dynamic range control of signals

1. A gain function controller comprising a processor and non-transitory computer readable medium, the processor configured to:

receive a first plurality of sub-band-signals that is based on a first full-band signal;

determine a frequency-domain-gain-function for a second plurality of sub-band-signals that is based on a second full-band signal, wherein the second full-band signal is not based on the first full-band signal, and wherein determining the frequency-domain-gain-function for the second plurality of sub-band-signals comprises determining the frequency-domain-gain-function for the second plurality of sub-band-signals based on:

the first plurality of sub-band-signals;

a power of the first full-band signal that does not include a power of the second full-band signal, wherein the first full-band signal is a measured noise signal or an estimated noise signal; and

a predetermined compression curve;

apply the frequency-domain-gain-function to the second plurality of sub-band-signals to provide a frequency-domain-output-signal, wherein the processor is further configured to determine the frequency-domain-gain-function to jointly control the second plurality of sub-band-signals based on an adaptive spectral subtraction factor that is identical for all sub-bands such that the frequency-domain-output-signal, when coupled to a loudspeaker, drives the loudspeaker within a pre-determined displacement limit for mechanical loudspeaker protection.

2. The gain function controller of claim 1 , wherein the first plurality of sub-band-signals corresponds to the second plurality of sub-band-signals in frequency.

3. The gain function controller of claim 1 , wherein the processor is further configured to determine a first plurality of sub-band-power-signals based on a power level of each of the first plurality of sub-band-signals and to determine the frequency-domain-gain-function based on the first plurality of sub-band-power-signals.

4. The gain function controller of claim 1 , wherein the second plurality of sub-band-signals corresponds to a plurality of frequency bands of the first full-band signal.

5. The gain function controller of claim 1 , wherein the processor is further configured to generate a model of a loudspeaker.

6. The gain function controller of claim 1 , wherein the first plurality of sub-band signals comprise a first plurality of frequency bands of the first full-band signal, the second plurality of sub-band signals comprise a second plurality of frequency bands of the second full-band signal and the first plurality of frequency bands corresponds to the second plurality of frequency bands.

7. The gain function controller of claim 1 , wherein the processor is further configured to determine the frequency-domain-gain-function based on one or more pluralities of further-sub-band-signals derived from one or more further-full-band-signals, and a power of each of the one or more further-full-band signals and/or a plurality of power levels of the one or more further-sub-band signals.

8. An integrated circuit or an electronic device comprising the gain function controller of claim 1 .