Audio signal processing stage, audio signal processing apparatus, audio signal processing method, and computer-readable storage medium

An audio signal processing stage for processing an input audio signal into an output audio signal, wherein the audio signal processing stage comprises:

• a filter bank defining two or more frequency bands, the filter bank being configured to separate the input audio signal into two or more input audio signal components, each of the two or more input audio signal components being limited to a respective one of the two or more frequency bands;
• a set of two or more band branches configured to provide two or more output audio signal components, wherein each of the two or more band branches is configured to process a respective one of the two or more input audio signal components to provide a respective one of the two or more output audio signal components;
• and
• an inverse filter bank configured to generate the output audio signal by summing the two or more output audio signal components;
• wherein the set of two or more band branches comprises one or more compressor branches, each of the compressor branches comprising:
• a compressor configured to generate a compressed audio signal component by compressing the input audio signal component of the respective compressor branch;
• a residual audio signal component generating unit configured to generate a residual audio signal component, the residual audio signal component being a difference between the input audio signal component of the respective compressor branch and the compressed audio signal component;
• a virtual bass unit configured to generate a virtual bass signal component which comprises one or more harmonics of the residual audio signal component, the virtual bass unit comprising a harmonics generator configured to generate the one or more harmonics on the basis of the residual audio signal component;
• and
• a summation unit configured to generate the output audio signal component of the respective compressor branch by summing the compressed audio signal component and the virtual bass signal component.

An audio signal processing method for processing an input audio signal into an output audio signal, wherein the audio signal processing method comprises:

• separating the input audio signal into two or more input audio signal components by means of a filter bank, the filter bank defining two or more frequency bands, each of the two or more input audio signal components being limited to a respective one of the two or more frequency bands;
• providing two or more output audio signal components on the basis of the two or more input audio signal components by means of a set of two or more band branches, wherein each of the two or more band branches provides a respective one of the two or more output audio signal components on the basis of a respective one of the two or more input audio signal components, wherein the set of two or more band branches comprises one or more compressor branches, each of the one or more compressor branches comprising a compressor that compresses the input audio signal component of the respective compressor branch to provide the output audio signal component of the respective compressor branch;
• generating a summed audio signal by summing the two or more output audio signal components;
• generating a residual audio signal which is a difference between the input audio signal and the summed audio signal;
• generating a virtual bass signal which comprises one or more harmonics of the residual audio signal, by generating the one or more harmonics on the basis of the residual audio signal;
• and
• generating the output audio signal by summing the summed audio signal and the virtual bass signal.

An audio signal processing method for processing an input audio signal into an output audio signal, wherein the audio signal processing method comprises:

• separating the input audio signal into two or more input audio signal components by means of a filter bank, the filter bank defining two or more frequency bands, each of the two or more input audio signal components being limited to a respective one of the two or more frequency bands;
• providing two or more output audio signal components on the basis of the two or more input audio signal components by means of a set of two or more band branches, wherein each of the two or more band branches provides a respective one of the two or more output audio signal components on the basis of a respective one of the input audio signal components, wherein the set of two or more band branches comprises one or more compressor branches, each of the one or more compressor branches comprising a compressor which generates a compressed audio signal component by compressing the input audio signal component of the respective compressor branch, a residual audio signal component generating unit which generates a residual audio signal component which is a difference between the input audio signal component of the respective compressor branch and the compressed audio signal component, a virtual bass unit which generates a virtual bass signal component comprising one or more harmonics of the residual audio signal component, by generating the one or more harmonics on the basis of the residual audio signal component, and a summation unit which generates the output audio signal component of the respective compressor branch by summing the compressed audio signal component and the virtual bass signal component;
• and
• generating the output audio signal by summing the two or more output audio signal components.