Skip to content

← spectral package

ContinuousWaveletTransform

Calculate a spectrogram (periodogram) of the given data using the Continuous Wavelet Transform (CWT).

The node will compute a new data array with a typically coarser time axis than the original data, and an additional frequency axis, thus yielding an estimate how the spectral content in the data changes over time. This node is most commonly applied to segmented data, i.e., following a Segmentation node -- in this case, it will compute a time/frequency representation for each segment in the data. The node can also be used on continuous data to yield the time-frequency representation for the data, but this can only be applied to a whole recording at once (i.e., non-streaming), and it will not work on streaming continuous (unsegmented) data. The covered frequency range can be controlled (indirectly) by adjusting the scale range parameter. The output of this node is complex if a complex wavelet was used, and real-valued otherwise. More Info... 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

scale_range

Range of wavelet scales.

  • verbose name: Scale Range
  • default value: [1, 129]
  • port type: ListPort
  • value type: list (can be None)

wavelet

Wavelet type to use.

  • verbose name: Wavelet
  • default value: cmor
  • port type: EnumPort
  • value type: str (can be None)

bandwidth_frequency

Bandwidth Frequency(Hz). This is needed only for cmor, fbsp, and shan wavelets.

  • verbose name: Bandwidth Frequency
  • default value: 1.0
  • port type: FloatPort
  • value type: float (can be None)

central_frequency

Central Frequency (Hz). This is needed only for cmor, fbsp, and shan wavelets.

  • verbose name: Central Frequency
  • default value: 1.5
  • 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)