Method for dynamically adjusting weighting values to equalize input signal to generate equalizer output signal and associated parametric equalizer

A parametric equalizer, comprising:

• a first parametric equalizer circuit, having a first transfer function with a positive gain, and arranged to process an input signal according to the first transfer function and output a first output signal by processing the input signal;
• a second parametric equalizer circuit, having a second transfer function with a negative gain, and arranged to process the input signal according to the second transfer function and output a second output signal by processing the input signal;
• a first multiplication circuit, coupled to the first parametric equalizer circuit, and arranged to multiply the first output signal and a first weighting value to generate a first adjusted output signal;
• a second multiplication circuit, coupled to the second parametric equalizer circuit, and arranged to multiply the second output signal and a second weighting value to generate a second adjusted output signal;
• an addition circuit, coupled to the first multiplication circuit and the second multiplication circuit, and arranged to combine the first adjusted output signal and the second adjusted output signal to generate an equalizer output signal;
• and
• a weighting control circuit, coupled to the first multiplication circuit, the second multiplication circuit, and the addition circuit, and arranged to dynamically adjust the first weighting value and the second weighting value according to the equalizer output signal.