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SignalProcessing

  

DownSample

  

down-sample a signal

 

Calling Sequence

Parameters

Options

Description

Thread Safety

Examples

Compatibility

Calling Sequence

DownSample( A, factor, phase )

Parameters

A

-

Array of real or complex values; the signal

factor

-

posint, down-sample factor

phase

-

nonnegint, (optional) phase

Options

• 

container : rtable, predefined Array for holding results

Description

• 

The DownSample( A, factor, phase ) command down-samples the signal in the Array A.

• 

The effect of this command is to copy one sample from each block of factor samples in A to the output.

• 

Before the code performing the computation runs, Maple converts A to a hardware datatype, first attempting float[8] and subsequently complex[8], unless it already has one of these datatypes. For this reason, it is most efficient if A has one of these datatypes beforehand.

• 

The phase argument determines an offset, so that the sample value from A occurs phase positions offset in the output array. The value of phase must be non-negative and less than the value of factor.

• 

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 size iquo( N + factor - 1 - phase, factor ) where N is the number of elements of A, and it must have datatype float[8] if A is real and complex[8] if A is complex.

Thread Safety

• 

The SignalProcessing[DownSample] command is thread-safe as of Maple 17.

• 

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

Examples

withSignalProcessing:

AArray1,2,3,4,5,6,7,8,9,'datatype'='float'8

A:=1.2.3.4.5.6.7.8.9.

(1)

DownSampleA,1

1.2.3.4.5.6.7.8.9.

(2)

DownSampleA,2

1.3.5.7.9.

(3)

DownSampleA,3

1.4.7.

(4)

DownSampleA,4

1.5.9.

(5)

DownSampleA,3,0

1.4.7.

(6)

DownSampleA,3,1

2.5.8.

(7)

DownSampleA,3,2

3.6.9.

(8)

CArray1..4,'datatype'='float'8:

DownSampleA,2,1,'container'=C

2.4.6.8.

(9)

C

2.4.6.8.

(10)

Compatibility

• 

The SignalProcessing[DownSample] command was introduced in Maple 17.

• 

For more information on Maple 17 changes, see Updates in Maple 17.

See Also

UpSample

 


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