Signal processing method

A sound processing device, comprising:

• one or more processors;
• and
• one or more computer-readable storage media comprising instructions stored thereon that, when executed by the one or more processors, cause the one or more processors to perform the steps of:
• receiving a first block of new sound samples,
• filtering the first block into at least two sub-band signals representing different frequency bands of the audio content in said first block, and
• performing at least the following steps S1 to S7 for at least a first sub-band signal of said at least two sub-band signals:
• S1) sub-sampling the sub-band signal,
• S2) adding the sub-sampled signal to a first buffer for the corresponding frequency band,
• S3) performing a resonance analysis step for the first buffer for the corresponding frequency band, thereby producing a filter response for the corresponding frequency band,
• S4) convolving the sub-sampled signal or the first complete block of the first buffer with the filter response for the corresponding frequency band,
• S5) adding the convolution result to a second buffer for the corresponding frequency band,
• S6) upsampling the first complete block of said second buffer for the corresponding frequency band, and
• S7) adding the upsampled result to a result buffer for the corresponding frequency band;
• and
• summing the first complete blocks of the result buffers for each frequency band to form an output block.

A computer-readable storage media comprising instructions stored thereon that, when executed by a processor, cause the processor to perform the steps of:

• receiving a first block of new sound samples,
• filtering the first block into at least two sub-band signals representing different frequency bands of the audio content in said first block, and
• performing at least the following steps S1 to S7 for at least a first sub-band signal of the at least two sub-band signals:
• S1) sub-sampling the sub-band signal,
• S2) adding the sub-sampled signal to a first buffer for the corresponding frequency band,
• S3) performing a resonance analysis step for the first buffer for the corresponding frequency band, thereby producing a filter response for the corresponding frequency band,
• S4) convolving the sub-sampled signal or the first complete block of the first buffer with the filter response for the corresponding frequency band,
• S5) adding the convolution result to a second buffer for the corresponding frequency band,
• S6) upsampling the first complete block of said second buffer for the corresponding frequency band, and
• S7) adding the upsampled result to a result buffer for the corresponding frequency band;
• and
• summing the first complete blocks of said result buffers for each frequency band to form an output block.