Interpolate signal using cascaded integratorcomb filter
DSP System Toolbox / Filtering / Multirate Filters
The CIC Interpolation block performs a sample rate increase (interpolation) on an input signal by an integer factor. cascaded integratorcomb (CIC) filters are a class of linear phase FIR filters that consist of a comb part and an integrator part.
The block supports real and complex fixedpoint inputs. In its normal mode of operation, the CIC Interpolation block allows the adder’s numeric values to overflow and wrap around [1] [3]. The FixedPoint infrastructure then causes overflow warnings to appear on the command line. This overflow is of no consequence.
The CIC Interpolation block requires a FixedPoint Designer™ license.
Data Types 

Multidimensional Signals 

VariableSize Signals 

[1] Hogenauer, E.B. “An Economical Class of Digital Filters for Decimation and Interpolation” IEEE Transactions on Acoustics, Speech and Signal Processing. Vol. 29, Number 2, 1981, pp. 155–162, 1981.
[2] MeyerBaese, U. Digital Signal Processing with Field Programmable Gate Arrays. New York: Springer Verlag, 2001.
[3] Harris, Fredric J., Multirate Signal Processing for Communication Systems. Upper Saddle River, NJ: Prentice Hall PTR, 2004.
dsp.CICCompensationDecimator
 dsp.CICCompensationInterpolator
 dsp.CICDecimator
 dsp.CICInterpolator
 dsp.FIRDecimator
 dsp.FIRHalfbandDecimator
 dsp.FIRHalfbandInterpolator
 dsp.FIRInterpolator