delta2db.m

Dsp中的Matlab

function [Rp,As] = delta2db(delta1,delta2)
% Conversion from Absolute delta specs to Relative dB specs
% ---------------------------------------------------------
% [Rp,As] = delta2db(delta1,delta2)
% Rp = Passband ripple
% As = Stopband attenuation
% d1 = Passband tolerance
% d2 = Stopband tolerance
%
Rp = -20*log10((1-delta1)/(1+delta1));
As = -20*log10(delta2/(1+delta1));