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upsample

Increase sampling rate by integer factor

Syntax

y = upsample(x,n)
y = upsample(x,n,phase)

Description

y = upsample(x,n) increases the sampling rate of x by inserting n – 1 zeros between samples. x can be a vector or a matrix. If x is a matrix, each column is considered a separate sequence. The upsampled y has x*n samples.

y = upsample(x,n,phase) specifies the number of samples by which to offset the upsampled sequence. phase must be an integer from 0 to n – 1.

Examples

collapse all

Increase the sampling rate of a sequence by 3.

x = [1 2 3 4];
y = upsample(x,3)
y =

     1     0     0     2     0     0     3     0     0     4     0     0

Increase the sampling rate of the sequence by 3 and add a phase offset of 2.

x = [1 2 3 4];
y = upsample(x,3,2)
y =

     0     0     1     0     0     2     0     0     3     0     0     4

Increase the sampling rate of a matrix by 3.

x = [1 2;
     3 4;
     5 6];
y = upsample(x,3)
y =

     1     2
     0     0
     0     0
     3     4
     0     0
     0     0
     5     6
     0     0
     0     0

Introduced before R2006a

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