Subsampling after the fact
This is a simple utility that allows you to take an existing CSC (.ncs) file and reduce the original sample rate down by a factor of your choosing. It does this by selecting every nth sample, determined by the selected divisor, and then reassembling the file into the standard CSC format as if it was originally recorded at the new rate. The original file is not affected and the subsampled file is stored in the same location as the original.
This can be advantageous if you want to have a full bandwidth, full resolution recording of your data, but then want to analyze a smaller subset and don't need the highest sample rate. This will speed up analysis and reduce the time needed to process the file(s).
Additionally, the file size of a rate reduced recording is substantially smaller. If the sampling rate is cut in half, so is the overall file size. This can save precious hard drive space when needed.
Digital Signal Processing (DSP) Filtering must be performed prior to running the CSC File Rate Reducer if the data was not sufficiently filtered during acquisition. Neuralynx recommends a 1:4 High Cut to Sampling Rate ratio. Example: 500Hz High Cut filter for 2000Hz sampling rate. The NLX CSC Filter application can be utilized to perform DSP filtering. This is necessary to prevent aliasing of the data during the rate reduction process.