g=freqfilter(winname,bw); g=freqfilter(winname,bw,fc);
| winname | Name of prototype |
| bw | Effective support length of the prototype |
| fc | Center frequency |
freqfilter(winname,bw) creates a full-length frequency response filter. The parameter winname specifies the shape of the frequency response. For accepted shape please see freqwin. bw defines a -6dB bandwidth of the filter in normalized frequencies.
freqfilter(winname,bw,fc) constructs a filter with a centre frequency of fc measured in normalized frequencies.
If one of the inputs is a vector, the output will be a cell array with one entry in the cell array for each element in the vector. If more input are vectors, they must have the same size and shape and the the filters will be generated by stepping through the vectors. This is a quick way to create filters for filterbank and ufilterbank.
freqfilter accepts the following optional parameters:
| 'fs',fs | If the sampling frequency fs is specified then the bandwidth bw and the centre frequency fc are specified in Hz. |
| 'complex' | Make the filter complex valued if the centre frequency is non-zero. This is the default. |
| 'real' | Make the filter real-valued if the centre frequency is non-zero. |
| 'delay',d | Set the delay of the filter. Default value is zero. |
| 'scal',s | Scale the filter by the constant s. This can be useful to equalize channels in a filter bank. |
| 'pedantic' | Force window frequency offset (g.foff) to a subsample precision by a subsample shift of the window. |