Decimation filter matlab

1. What is a decimation filter?
2. How to use decimate in matlab?
3. Which filter is used in decimation and interpolation?
4. What is interpolation and decimation filters and why we need it?

What is a decimation filter?

Decimation filters help you remove the excess bandwidth and reduce the sampling frequency of the signal. Decimation filters also help you reduce the computational resources required for processing and storing the signal.

How to use decimate in matlab?

y = decimate( x , r ) reduces the sample rate of x , the input signal, by a factor of r . The decimated vector, y , is shortened by a factor of r so that length(y) = ceil(length(x)/r) . By default, decimate uses a lowpass Chebyshev Type I infinite impulse response (IIR) filter of order 8.

Which filter is used in decimation and interpolation?

11.2 Polyphase Filter Structure and Implementation. Due to the nature of the decimation and interpolation processes, polyphase filter structures can be developed to efficiently implement the decimation and interpolation filters (using fewer number of multiplications and additions).

What is interpolation and decimation filters and why we need it?

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.