multiply an array of samples by a triangular windowing function - Maple Help

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SignalProcessing[TriangleWindow] - multiply an array of samples by a triangular windowing function

Calling Sequence

TriangleWindow(A)

Parameters

A

-

Array of real or complex numeric values; the signal

Description

• 

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

• 

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

piecewise1km&comma;km&comma;m<kN&comma;wNk1

• 

where m&equals;12N for even N, and m&equals;12N12 for odd N.

• 

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[TriangleWindow] command is thread-safe as of Maple 18.

• 

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

Examples

withSignalProcessing&colon;

N:=1024&colon;

a:=GenerateUniformN&comma;1&comma;1

a:= 1 .. 1024 ArrayData Type: float8Storage: rectangularOrder: C_order

(1)

TriangleWindowa

1 .. 1024 VectorrowData Type: float8Storage: rectangularOrder: C_order

(2)

c:=Array1..N&comma;&apos;datatype&apos;&equals;&apos;float&apos;8&comma;&apos;order&apos;&equals;&apos;C_order&apos;&colon;

TriangleWindowArray1..N&comma;&apos;fill&apos;&equals;1&comma;&apos;datatype&apos;&equals;&apos;float&apos;8&comma;&apos;order&apos;&equals;&apos;C_order&apos;&comma;&apos;container&apos;&equals;c

1 .. 1024 VectorrowData Type: float8Storage: rectangularOrder: C_order

(3)

u:=`~`logFFTc&colon;

useplotsindisplayArray&real;u&comma;listplot&Im;uend use

Error, (in plots:-display) element 1 of the rtable is not a valid plot structure

See Also

SignalProcessing


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