The Effect of the Order of Downsampling and Smoothing on the Output

1. Does downsampling cause aliasing?
2. How does downsampling work?
3. What is the process of downsampling called?
4. What do you mean by downsampling?

Does downsampling cause aliasing?

If a discrete-time signal's baseband spectral support is not limited to an interval of width 2 π / M radians, downsampling by M results in aliasing. Aliasing is the distortion that occurs when overlapping copies of the signal's spectrum are added together.

How does downsampling work?

Downsampling. The idea of downsampling is remove samples from the signal, whilst maintaining its length with respect to time. For example, a time signal of 10 seconds length, with a sample rate of 1024Hz or samples per second will have 10 x 1024 or 10240 samples.

What is the process of downsampling called?

The down sampling process is called decimation.

What do you mean by downsampling?

Downsampling (in this context) means training on a disproportionately low subset of the majority class examples. Upweighting means adding an example weight to the downsampled class equal to the factor by which you downsampled.