Howtosignalprocessing
- Is downsampling and decimation same?
- What is the difference between interpolation and decimation?
- Why is decimation needed?
- What happens when Downsample?
Is downsampling and decimation same?
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 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.
Why is decimation needed?
Decimation is useful in applications in which the Nyquist frequency of a signal is much higher than the highest frequency of the signal. Decimation filters help you remove the excess bandwidth and reduce the sampling frequency of the signal.
What happens when Downsample?
Downsampling is done to decrease the bit rate when transmitting over a limited bandwidth or to convert to a more limited audio format. Contrast with upsample. See sampling. (2) To decrease the color depth of a digital image; for example, from 24 bits to 16 bits per pixel.
