forgot the patch...whoops On 11/5/06, Charles Henry <[EMAIL PROTECTED]> wrote:
Hi, list, I have practically abandoned the idea of making a subband adaptive filter scheme using externals, but have not given up on making a Newton-method, rather than a gradient descent method (Fourier deconvolution is a Newton method, for instance, LMS and NLMS is a gradient descent method).So, I've written the convolution routine and it works mostly. There is a high frequency component of the error that doesn't make sense to me. All I did was the complex multiplication of two fft's, and it seems like it's not handling the Nyquist frequency well. Any ideas? Also, I wondered if there would be a way to move a block of samples (in this patch length 2*L) within a block of samples length 2*N, from the end of the block to the beginning of the block. This would reduce latency of the filter patch (currently 2*N-L) to L (samples). N is the filter length, and L is the intended latency. I've attached the patch, as is, where you can see the high-freq. weirdness that goes on. Just turn on the filter using the toggle box above [s f_on$0] and hit the message [256 64], in that order. Any suggestions would be gratefully recieved! Chuck
adapt_filt.pd
Description: Binary data
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