.. _auto_curve_to_octaves:

*CONVERT THE FREQUENCY TO 1 3 BANDS*
====================================

Converts a frequency-domain curve into 1/3-octave band representation by aggregating spectral values within each band. Use this worker to reformat narrow-band FFT or PSD curves into standardised octave-band spectra for NVH and acoustics post-processing. The aggregation method (average, RMS, or max) is selectable per analysis need.

When to use
-----------

Classification: **process**.

Tagged: ``1/3-octave``, ``acoustics``, ``band_13``, ``fft``, ``frequency``, ``nvh``, ``octave``, ``octave_band``.

Inputs
------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve 1
     - curve1
     - vector
     - —
     - 
     - Input frequency-domain curve (e.g. FFT or PSD result) whose X-axis represents frequency in Hz; leave empty if the curve will be injected programmatically.
   * - Octave Type
     - octave_type
     - string
     - nte
     - 
     - Octave-band scheme to apply; currently supports 'band_13' (1/3-octave bands); defaults to 'nte' — leave at default for standard 1/3-octave processing.
   * - Value Type
     - value_type
     - string
     - avg
     - 
     - Aggregation method applied within each band: 'avg' (arithmetic mean), 'rms' (root-mean-square), or 'max' (peak value); defaults to 'avg'.

Outputs
-------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - curve_to_octaves_output_1
     - curve_to_octaves_output_1
     - vector
     - Output curve with 1/3-octave band centre frequencies on the X-axis and the aggregated amplitude (avg/rms/max) on the Y-axis, ready for NVH reporting or further analysis.

Disciplines
-----------

- data.curve.transform
- data.signal_processing
- engineering.nvh

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=curve_to_octaves <https://www.d3view.com/api/workflow/example?id=curve_to_octaves>`_

.. raw:: html

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_to_octaves</code>. Schema hash: <code>6083d95b9c00</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>