Type alias SpectrogramPluginOptions

Type declaration

• Optional alpha?: number

  Some window functions have this extra value. (Between 0 and 1)

• Optional colorMap?: number[][] | "gray" | "igray" | "roseus"

  A 256 long array of 4-element arrays. Each entry should contain a float between 0 and 1 and specify r, g, b, and alpha. Each entry should contain a float between 0 and 1 and specify r, g, b, and alpha.

  • gray: Gray scale.
  • igray: Inverted gray scale.
  • roseus: From https://github.com/dofuuz/roseus/blob/main/roseus/cmap/roseus.py

• Optional container?: string | HTMLElement

  Selector of element or element in which to render

• Optional fftSamples?: number

  Number of samples to fetch to FFT. Must be a power of 2.

• Optional frequenciesDataUrl?: string

  URL with pre-computed spectrogram JSON data, the data must be a Uint8Array[][] *

• Optional frequencyMax?: number

  Max frequency to scale spectrogram. Set this to samplerate/4 to draw whole range of spectrogram.

• Optional frequencyMin?: number

  Min frequency to scale spectrogram.

• Optional gainDB?: number

  Increases / decreases the brightness of the display. For small signals where the display is mostly "blue" (dark) you can increase this value to see brighter colors and give more detail. If the display has too much "white", decrease this value. The default is 20dB and corresponds to a -20 dB signal at a particular frequency being displayed as "white".

• Optional height?: number

  Height of the spectrogram view in CSS pixels

• Optional labels?: boolean

  Set to true to display frequency labels.

• Optional labelsBackground?: string

• Optional labelsColor?: string

• Optional labelsHzColor?: string

• Optional noverlap?: number

  Size of the overlapping window. Must be < fftSamples. Auto deduced from canvas size by default.

• Optional rangeDB?: number

  Affects the range of signal sizes that will be displayed as colors. The default is 80 dB and means that you will not see anything for signals 80 dB below the value set for "Gain".

• Optional scale?: "linear" | "logarithmic" | "mel" | "bark" | "erb"

  Based on: https://manual.audacityteam.org/man/spectrogram_settings.html

  • Linear: Linear The linear vertical scale goes linearly from 0 kHz to 20 kHz frequency by default.
  • Logarithmic: This view is the same as the linear view except that the vertical scale is logarithmic.
  • Mel: The name Mel comes from the word melody to indicate that the scale is based on pitch comparisons. This is the default scale.
  • Bark: This is a psychoacoustical scale based on subjective measurements of loudness. It is related to, but somewhat less popular than, the Mel scale.
  • ERB: The Equivalent Rectangular Bandwidth scale or ERB is a measure used in psychoacoustics, which gives an approximation to the bandwidths of the filters in human hearing

• Optional splitChannels?: boolean

  Render a spectrogram for each channel independently when true.

• Optional windowFunc?: "bartlett" | "bartlettHann" | "blackman" | "cosine" | "gauss" | "hamming" | "hann" | "lanczoz" | "rectangular" | "triangular"

  The window function to be used.