Vamp Plugins Forum

Using Vamp Plugins and Hosts => Host Forum: Sonic Visualiser => Topic started by: mark_orion on March 30, 2013, 18:03:59

Title: Decimation in spectrograms ?
Post by: mark_orion on March 30, 2013, 18:03:59

Is it possible to use decimation in spectrograms and how can this be done ? Decimation uses only every n-th. sample for the spectrum analysis. This highly increases resolution in the lower frequency bands while lowering the highest frequency in the spectrogram. For example decimating a recording with 48Khz samplererate by 256 would give you a maximum frequency of about 97Hz with possible resolutions of less than 1 Hz.

Title: Re: Decimation in spectrograms ?
Post by: cannam on April 26, 2013, 16:46:17

SV doesn't actually have any means of downsampling or decimating audio on request, I'm afraid -- it would be necessary to downsample the file outside of SV before loading it.

It would be possible for a Vamp plugin to offer this as an option, but I'm not sure whether any existing one does.


Chris