Upsampling vs 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.)

1. Is upsampling an interpolation?
2. What is the difference between upsampling and oversampling?
3. Does upsampling improve sound quality?
4. What is the difference between interpolation and decimation?

Is upsampling an interpolation?

In digital signal processing, upsampling, expansion, and interpolation are terms associated with the process of resampling in a multi-rate digital signal processing system. Upsampling can be synonymous with expansion, or it can describe an entire process of expansion and filtering (interpolation).

What is the difference between upsampling and oversampling?

Basics of Sampling - Oversampling and Upsampling

When practically implemented though, oversampling refers to using a higher sampling rate than needed to run the A/D or D/A converter thus increasing the rate of the signal. Upsampling is on the other hand a rate conversion from one rate to another arbitrary rate.

Does upsampling improve sound quality?

When we upsample a 44.1kHz 16-bit file to a higher rate and depth, like 96kHz 24 bits, we typically get better sound quality.

What is the difference between interpolation and decimation?

Decimation and interpolation are the two basic building blocks in the multirate digital signal processing systems. The decimator is utilized to decrease the sampling rate and interpolator to increase the sampling rate.