常见计权方式

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1.A-Weighting

        A计权，模拟一般情况下人耳对声音的感知，和40phon等响曲线对应；

A-Weighting滤波器的Matlab实现

function A = filterA(f,plotFilter) %% Define filter coefficients. c1 = 3.e16; c2 = 20.^2; c3 = 107.65265^2; c4 = 737.86223^2; c5 = 12194.217^2; %% Evaluate A-weighting filter. f(find(f == 0)) = 1e-17; f = f.^2; num = c1*f.^4; den = ((c2+f).^2) .* (c3+f) .* (c4+f) .* ((c5+f).^2); A = num./den; %% 画dBA计权图. if exist('plotFilter') & plotFilter % Plot using dB scale. figure(2); clf; semilogx(sqrt(f),10*log10(A)); title('A-weighting Filter'); xlabel('Frequency (Hz)'); ylabel('Magnitude (dB)'); xlim([10 100e3]); grid on; ylim([-70 10]); % Plot using linear scale. figure(3); plot(sqrt(f),A); title('A-weighting Filter'); xlabel('Frequency (Hz)'); ylabel('Amplitude'); xlim([0 44.1e3/2]); grid on; end

2.C-Weighting

C计权，模拟高分贝情况下人耳对声音的感知；

3.Z-Weighting

Z计权，不作加权处理