Device and method for filtering signal

A method of filtering a signal using a signal filtering device, the method comprising:

• generating, at a processor of the signal filtering device, one or more matrices based on a size of a digital filter bank that generates an output signal by dividing an input signal into a plurality of channels, the one or more matrices comprising a first matrix and a second matrix, each of the first and second matrices comprising a plurality of rows;
• storing, at the processor, the first matrix to which a plurality of digital filter bank coefficients are assigned and the second matrix to which a plurality of input signals are assigned;
• partially selecting two or more digital filter bank coefficients from the plurality of digital filter bank coefficients of the first matrix based on a number of at least some of the plurality of channels such that only a portion of digital filter bank coefficients in each row of the first matrix is selected;
• calculating the selected two or more digital filter bank coefficients;
• partially selecting two or more input signals from the plurality of input signals of the second matrix based on the number of the at least some of the plurality of channels such that only a portion of input signals in each row of the second matrix is selected;
• separately calculating the selected two or more input signals;
• calculating, at the processor, a signal based on the calculated two or more digital filter bank coefficients and the separately calculated two or more input signals;
• performing, at the processor, a discrete Fourier transform (DFT) on the calculated signal;
• and
• compensating, at the processor, for a phase of the discrete Fourier transformed signal according to a preset reference.

A non-transitory computer readable recording medium storing a computer program, wherein the computer program, when executed by a processor, comprises instructions for enabling the processor to perform a method of filtering a signal using a signal filtering device, the method comprising:

• generating, at a processor of the signal filtering device, one or more matrices based on a size of a digital filter bank that generates an output signal by dividing an input signal into a plurality of channels, the one or more matrices comprising a first matrix and a second matrix, each of the first and second matrices comprising a plurality of rows;
• storing, at the processor, the first matrix to which a plurality of digital filter bank coefficients are assigned and the second matrix to which a plurality of input signals are assigned;
• partially selecting two or more digital filter bank coefficients from the plurality of digital filter bank coefficients of the first matrix based on a number of at least some of the plurality of channels such that only a portion of digital filter bank coefficients in each row of the first matrix is selected;
• calculating the selected two or more digital filter bank coefficients;
• partially selecting two or more input signals from the plurality of input signals of the second matrix based on the number of the at least some of the plurality of channels such that only a portion of input signals in each row of the second matrix is selected;
• separately calculating the selected two or more input signals;
• calculating, at the processor, a signal based on the calculated two or more digital filter bank coefficients and the separately calculated two or more input signals;
• performing, at the processor, a discrete Fourier transform (DFT) on the calculated signal;
• and
• compensating, at the processor, for a phase of the discrete Fourier transformed signal according to a preset reference.