gf=filterbankresponse(g,a,L);
gf=filterbankresponse(g,a,L) computes the total response in frequency of a filterbank specified by g and a for a signal length of L. This corresponds to summing up all channels. The output is a usefull tool to investigate the behaviour of the windows, as peaks indicate that a frequency is overrepresented in the filterbank, while a dip indicates that it is not well represented.
CAUTION: This function computes a sum of squares of modulus of the frequency responses, which is also the diagonal of the Fourier transform of the frame operator. Use filterbankfreqz for evaluation or plotting of frequency responses of filters.
filterbankresponse(g,a,L,'real') does the same for a filterbank intended for positive-only filterbank.
filterbankresponse(g,a,L,fs) specifies the sampling rate fs. This is only used for plotting purposes.
gf=filterbankresponse(g,a,L,'individual') returns responses in frequency of individual filters as columns of a matrix. The total response can be obtained by gf = sum(gf,2).
filterbankresponse takes the following optional parameters:
- 'fs',fs
- Sampling rate, used only for plotting.
- 'complex'
- Assume that the filters cover the entire frequency range. This is the default.
- 'real'
- Assume that the filters only cover the positive frequencies (and is intended to work with real-valued signals only).
- 'noplot'
- Don't plot the response, just return it.
- 'plot'
- Plot the response using plotfftreal or plotfft.