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DADiSP Worksheet Functions > Function Categories > Fourier Transforms and Signal Processing > IDST

 

IDST

Purpose:

Calculates the Inverse Discrete Sine Transform.

Syntax:

IDST(series, n)

series

-

An input series or array.

n

-

Optional. An integer, the transform length. Defaults to length(series).

Returns:

A series or array.

Example:

idst(dst(gsin(100, 1/100, 20)))

 

returns a 20 Hz sine wave.

Remarks:

The inverse discrete sine transform is defines as:

 

 

 

The transform is applied to each column if the input is an array. See DST to perform the Discrete Sine Transform.

See Also:

DCT

DCT2

DST

IDCT

IDCT2

IFFT