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SignalProcessing

  

RiemannWindow

  

multiply an array of samples by a Riemann windowing function

 

Calling Sequence

Parameters

Options

Description

Thread Safety

Examples

Compatibility

Calling Sequence

RiemannWindow(A)

Parameters

A

-

Array of real or complex numeric values; the signal

Options

• 

container : Array, predefined Array for holding results

• 

inplace : truefalse, specifies that output should overwrite input

Description

• 

The RiemannWindow(A) command multiplies the Array A by the Riemann windowing function and returns the result in an Array having the same length.

• 

The Riemann windowing function wk is defined as follows for a sample with N points.

1k=N2sin2kN1π2kN1πotherwise

• 

Before the code performing the computation runs, A is converted to datatype float[8] or complex[8] if it does not have one of those datatypes already. For this reason, it is most efficient if A has one of these datatypes beforehand. This does not apply if inplace is true.

• 

If the container=C option is provided, then the results are put into C and C is returned. With this option, no additional memory is allocated to store the result. The container must be an Array of the same size and datatype as A.

• 

If the inplace or inplace=true option is provided, then A is overwritten with the results. In this case, the container option is ignored.

Thread Safety

• 

The SignalProcessing[RiemannWindow] command is thread-safe as of Maple 18.

• 

For more information on thread safety, see index/threadsafe.

Examples

withSignalProcessing:

N1024:

aGenerateUniformN,1,1

_rtable18446884166267048174

(1)

RiemannWindowa

_rtable18446884166129268846

(2)

cArray1..N,datatype=float8,order=C_order:

RiemannWindowArray1..N,fill=1,datatype=float8,order=C_order,container=c

_rtable18446884166129257158

(3)

u`~`logFFTc:

useplotsindisplayArraylistplotℜu,listplotℑuend use

Compatibility

• 

The SignalProcessing[RiemannWindow] command was introduced in Maple 18.

• 

For more information on Maple 18 changes, see Updates in Maple 18.

See Also

SignalProcessing