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SignalProcessing

  

FlatTopWindow

  

multiply an array of samples by a flat top windowing function

 

Calling Sequence

Parameters

Options

Description

Thread Safety

Examples

Compatibility

Calling Sequence

FlatTopWindow(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 FlatTopWindow(A) command multiplies the Array A by the flat top windowing function and returns the result in an Array having the same length.

• 

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

wk=215578950.41663158cos2kπn+0.277263158cos4kπn0.083578947cos6kπn+0.006947368cos8kπn

• 

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

• 

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

Examples

withSignalProcessing:

N1024:

aGenerateUniformN,1,1

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

(1)

FlatTopWindowa

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

(2)

cArray1..N,'datatype'='float'8,'order'='C_order':

FlatTopWindowArray1..N,'fill'=1,'datatype'='float'8,'order'='C_order','container'=c

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

(3)

u`~`[log]FFTc:

useplotsindisplayArraylistplotℜu,listplotℑuend use

Compatibility

• 

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

• 

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

See Also

SignalProcessing

 


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