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← signal_processing package

RectangularMovingWindowStandardization

Standardize the signal in a sliding rectangular window.

This node estimates the running mean and running standard deviation in a rectangular window (that is, with equal weighting). Then, each sample is converted to z scores by subtracting the running mean and dividing by the running standard deviation, which are estimated from the k samples prior to that sample. This filter maintains internal state to work seamlessly across chunk boundaries. On the first window length samples, the result will not yet be standardized fully since the filter first needs to collect sufficient data. Version 1.0.0

Ports/Properties

data

Data to process.

verbose name
Data
default value
None
port type
DataPort
value type
Packet (can be None)
data direction
INOUT

means

Estimated averages. This is an additional diagnostic.

verbose name
Means
default value
None
port type
DataPort
value type
Packet (can be None)
data direction
OUT

stddevs

Estimated standard deviations. This is an additioanl diagnostic.

verbose name
Stddevs
default value
None
port type
DataPort
value type
Packet (can be None)
data direction
OUT

window_length

Length of sliding window. This is the window length over which the variance of the signal is estimated.

verbose name
Window Length
default value
30
port type
FloatPort
value type
float (can be None)

window_length_unit

Unit in which the window length is given.

verbose name
Unit Of Measurement For Window Length
default value
seconds
port type
EnumPort
value type
str (can be None)

ignore_nans

If activated the channels containing nan values are ignored.

verbose name
Ignore Channels With Nan Values
default value
False
port type
BoolPort
value type
bool (can be None)

from_to_stream

Apply scaling from a stream to another stream.

verbose name
From To Stream
default value
None
port type
DictPort
value type
dict (can be None)

epsilon

Smallest possible standard deviation, to prevent division by zero.

verbose name
Epsilon
default value
1e-15
port type
FloatPort
value type
float (can be None)

set_breakpoint

Set a breakpoint on this node. If this is enabled, your debugger (if one is attached) will trigger a breakpoint.

verbose name
Set Breakpoint (Debug Only)
default value
False
port type
BoolPort
value type
bool (can be None)

metadata

User-definable meta-data associated with the node. Usually reserved for technical purposes.

verbose name
Metadata
default value
{}
port type
DictPort
value type
dict (can be None)