Determination method and apparatus for preset of audio equalizer (aeq)

An apparatus for determining a preset of an Audio Equalizer (AEQ), the apparatus comprising:

• an obtaining unit configured to obtain a predefined preset of the AEQ, wherein the preset comprises a first set of parameters for determining positions of poles of a transfer function of the AEQ system, and a second set of parameters for determining positions of zeros of the transfer function of the AEQ system;
• a first processing unit, connected with the obtaining unit, configured to determine a frequency response-amplitude curve of the AEQ, and frequency response-amplitude curves of all second-order IIR filters according to the first set of parameters and the second set of parameters, the frequency response-amplitude curves of all the second-order IIR filters being configured to synthesize the frequency response-amplitude curve of the AEQ, and to determine the first set of frequencies according to the frequency response-amplitude curve of the AEQ, wherein the frequency response-amplitude curve of the AEQ is below or equal to a first pre-defined threshold at frequencies in the first set of frequencies;
• and
• a second processing unit, connected with the first processing unit, configured to adjust the frequency response-amplitude curves of all the second-order IIR filters at the frequencies in the first set of frequencies so that the adjusted frequency response-amplitude curves of all the second-order IIR filters at the frequencies in the first set of frequencies satisfy the pre-defined conditions, and to determine adjustment amounts of the frequency response-amplitude curves of all the second-order IIR filters;
• and to adjust the first set of parameters, and the second set of parameters according to the adjustment amounts of the frequency response-amplitude curves of all the second-order IIR filters, and to determine the adjusted first set of parameters, and the adjusted second set of parameters as the preset of the AEQ.

An apparatus for determining a preset of an Audio Equalizer (AEQ), the apparatus comprising:

• a transceiver configured to obtain a predefined preset of the AEQ, wherein the preset comprises a first set of parameters for determining positions of poles of a transfer function of the AEQ system, and a second set of parameters for determining positions of zeros of the transfer function of the AEQ system;
• and
• a processor configured to read program in a memory to execute:
• to determine a frequency response-amplitude curve of the AEQ, and frequency response-amplitude curves of all second-order IIR filters according to the first set of parameters and the second set of parameters, the frequency response-amplitude curves of all the second-order IIR filters being configured to synthesize the frequency response-amplitude curve of the AEQ, and to determine a first set of frequencies from the frequency response-amplitude curve of the AEQ, wherein the frequency response-amplitude curve of the AEQ is below or equal to the first pre-defined threshold at the frequencies in the first set of frequencies;
• to adjust the frequency response-amplitude curves of all the second-order IIR filters at the frequencies in the first set of frequencies so that the adjusted frequency response-amplitude curves of all the second-order IIR filters at the frequencies in the first set of frequencies satisfy the pre-defined conditions, and to determine adjustment amounts of the frequency response-amplitude curves of all the second-order IIR filters;
• and to adjust the first set of parameters, and the second set of parameters according to the adjustment amounts of the frequency response-amplitude curves of all the second-order IIR filters, and to determine the adjusted first set of parameters, and the adjusted second set of parameters as the preset of the AEQ.