calc_parameters.m

均衡器的参数设置,设置不同的参数

%% calc_parameters.m
%%
% This function takes the user input and makes it a bit more usable for the
% rest of the functions.  Given the lowest center frequency, highest center
% frequency, a filter scalar or vector, a band pass gain scalar or vector,
% and the number of filters in the equalizer, return a vector of angular
% frequencies, qualities, band pass gains, and a scalar representing the
% number of filters.

function [w0,q0,hbp,n] = calc_parameters(f01,f02,q0,hbp,n)
%%
    
%% Center frequency selection
%%
% We would like to have the center frequencies of the fitlers evenly
% spaced (logarithmically) in frequency.  The follwoing code accomplishes
% this.


    %for the specificed frequency range, choose the 
    %cetner frequencies of the filters.
    low_freq = log10(2*pi*f01);                
    high_freq = log10(2*pi*f02);             
    w0 = logspace(low_freq,high_freq,n);
%%
    
%% Quality and band pass gain vector creation
%%
% The user can enter either a scalar or a vector for the quality of each
% filter.  If a scalar is entered, the scalar will be copied to a vector of
% length n, where n reprensents the number of fitlers in the equalizer

    
    %if the user supplied a single value, extend the vector
    %to n. each entry will be the specified value.
    if (length(q0) < n)
        for filter_n = 1:n
            q0(filter_n) = q0(1);
        end
    end
    
    %same idea here
    if (length(hbp) < n)
        for filter_n = 1:n
            hbp(filter_n) = hbp(1);
        end
    end
    
    %haha
    n = n;

end
%%