Howtosignalprocessing
- What is CIC decimation?
- How does a CIC filter work?
- Why low pass filter is used in decimation?
- Which filter is used in decimation and interpolation?
What is CIC decimation?
The CIC Decimation block performs a sample rate decrease (decimation) on an input signal by an integer factor. Cascaded Integrator-Comb (CIC) filters are a class of linear phase FIR filters comprised of a comb part and an integrator part. The block supports real and complex fixed-point inputs.
How does a CIC filter work?
A CIC filter consists of one or more integrator and comb filter pairs. In the case of a decimating CIC, the input signal is fed through one or more cascaded integrators, then a down-sampler, followed by one or more comb sections (equal in number to the number of integrators).
Why low pass filter is used in decimation?
Decimation also is known as down-sampling. The lowpass filtering associated with decimation removes high-frequency content from the signal to accommodate the new sampling frequency. Decimation is useful in applications in which the Nyquist frequency of a signal is much higher than the highest frequency of the signal.
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).
