Audio signal processing method, device and storage medium for reducing signal delay

An audio signal processing device comprises a non-transitory computer storage medium, on which one or more executable instructions are stored, wherein the one or more executable instructions can be executed by a processor to perform the following steps:

• providing an input audio signal comprising a plurality of input data frames offset from each other by a predetermined frame shift and each of the plurality of input data frames having a predetermined frame length;
• performing first windowing process on the plurality of input data frames in sequence with a first window function, a start point and an end point of the first window function being aligned with two ends of each input data frame respectively;
• wherein the first window function comprises a starting function portion starting from a starting region of the first window function, an ending function portion in an ending region of the first window function and an intermediate function portion in an intermediate region of the first window function between the starting region and the ending region;
• and wherein the intermediate function portion has a first weighting factor, the starting function portion changes from 0 at the start point to the first weighting factor adjacent to the intermediate region, the ending function portion changes from the first weighting factor adjacent to the intermediate region to 0 at the end point;
• performing predetermined signal processing on the input audio signal after the first windowing processing and generating an output audio signal, wherein the output audio signal comprises a plurality of output data frames corresponding to the plurality of input data frames of the input audio signal, and each output data frame has the predetermined frame length;
• performing a second windowing processing on the plurality of output data frames in sequence with a second window function, a start point and an end point of the second window function being aligned with two ends of each output data frame respectively;
• wherein the second window function comprises a suppression function portion in a suppression region of the second window function, an output function portion in an output region of the second window function, and a compensation function portion in a compensation region of the second window function between the suppression region and the output region, wherein the output region has a length equal to that of the ending region;
• wherein the suppression function portion starts from 0 at the start point and for suppressing the output audio signal, the output function portion ends at 0 at the end point;
• and the compensation function portion is configured to provide signal weighting related to the output function portion and to compensate a difference in signal weighting between the ending function portion and the first weighting factor, and wherein the compensation function portion changes from the suppression function portion adjacent to the suppression region to the output function adjacent to the output region;
• and
• outputting the plurality of output data frames after the second windowing processing by superimposing the plurality of output data frames with the predetermined frame shift.

A non-transitory computer storage medium on which one or more executable instructions are stored, wherein the one or more executable instructions can be executed by a processor to perform the following steps:

• providing an input audio signal comprising a plurality of input data frames offset from each other by a predetermined frame shift and each of the plurality of input data frames having a predetermined frame length;
• performing first windowing process on the plurality of input data frames in sequence with a first window function, a start point and an end point of the first window function being aligned with two ends of each input data frame respectively;
• wherein the first window function comprises a starting function portion starting from a starting region of the first window function, an ending function portion in an ending region of the first window function and an intermediate function portion in an intermediate region of the first window function between the starting region and the ending region;
• and wherein the intermediate function portion has a first weighting factor, the starting function portion changes from 0 at the start point to the first weighting factor adjacent to the intermediate region, the ending function portion changes from the first weighting factor adjacent to the intermediate region to 0 at the end point;
• performing predetermined signal processing on the input audio signal after the first windowing processing and generating an output audio signal, wherein the output audio signal comprises a plurality of output data frames corresponding to the plurality of input data frames of the input audio signal, and each output data frame has the predetermined frame length;
• performing a second windowing processing on the plurality of output data frames in sequence with a second window function, a start point and an end point of the second window function being aligned with two ends of each output data frame respectively;
• wherein the second window function comprises a suppression function portion in a suppression region of the second window function, an output function portion in an output region of the second window function, and a compensation function portion in a compensation region of the second window function between the suppression region and the output region, wherein the output region has a length equal to that of the ending region;
• wherein the suppression function portion starts from 0 at the start point and for suppressing the output audio signal, the output function portion ends at 0 at the end point;
• and the compensation function portion is configured to provide signal weighting related to the output function portion and to compensate a difference in signal weighting between the ending function portion and the first weighting factor, and wherein the compensation function portion changes from the suppression function portion adjacent to the suppression region to the output function adjacent to the output region;
• and
• outputting the plurality of output data frames after the second windowing processing by superimposing the plurality of output data frames with the predetermined frame shift.