Decimation and Upsampling

1. What is the difference between decimation and downsampling?
2. What is difference between upsampling & interpolation?
3. What is upsampling method?
4. What is the purpose of upsampling?

What is the difference between decimation and downsampling?

Loosely speaking, “decimation” is the process of reducing the sampling rate. In practice, this usually implies lowpass-filtering a signal, then throwing away some of its samples. “Downsampling” is a more specific term which refers to just the process of throwing away samples, without the lowpass filtering operation.

What is difference between upsampling & interpolation?

Upsampling adds to the original signal undesired spectral images which are centered on multiples of the original sampling rate. “Interpolation”, in the DSP sense, is the process of upsampling followed by filtering. (The filtering removes the undesired spectral images.)

What is upsampling method?

Upsampling or Oversampling refers to the technique to create artificial or duplicate data points or of the minority class sample to balance the class label. There are various oversampling techniques that can be used to create artificial data points.

What is the purpose of upsampling?

The purpose of Upsampling is to manipulate a signal in order to artificially increase the sampling rate.