decimate

Lowpass filter and downsample a vector.

📝Syntax

Y = decimate(X, Q)
Y = decimate(X, Q, N)
Y = decimate(X, Q, N, 'iir')
Y = decimate(X, Q, N, 'fir')

📥Input Arguments

Parameter	Description
X	nonempty input vector.
Q	integer decimation factor greater than one.
N	filter order. The default order is 8 for IIR mode and 30 for FIR mode.

📤Output Arguments

Parameter	Description
Y	decimated vector.

📄Description

decimate applies an anti-aliasing lowpass filter and keeps every Q-th sample. The default mode uses an IIR Chebyshev type I lowpass filter with zero-phase forward and reverse filtering. The 'fir' mode uses a windowed FIR lowpass filter and compensates its delay before downsampling.

💡Examples

y = decimate(1:20, 2, 4, 'fir');

🔗See Also

downsample resample upfirdn

🕔Version History

Version	Description
2.0.0	initial version

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