foobar2000:Components/Spectrogram (foo_uie_spectrogram)

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Spectrogram
Developer(s)	Alireza Ayoubi (Wamoc)
Repository
Release information
Initial release
Stable release
Preview release
foobar2000 compatibility
Minimum version	TBC
Maximum version	{{{foobar2000_maximum}}}
UI module(s)	Columns UI
Additional information
Use	Visualization
License	Proprietary
Discussion thread	{{{discussion_thread}}}
View all components

A spectrogram visualization for Columns UI with more customization than default spectrogram. Based on a showspectrum filter from FFmpeg.

Options

The options can be accessed by right clicking the spectrogram and select Options in the menu.

General

Slide

Specify how the spectrogram slide along the window.

It accepts its following values:

Replace

Samples moves to the right and it resets to left when it reaches the right

Scroll

Samples scroll from left to right

Default value is Scroll.

Channel mode

Specify the modes when dealing with multiple channels.

It accepts the following values:

Combined

All channels are combined and visualized in a single row

Separate

All channels are visualized in separate rows

Default value is Combined.

Color

Set the color of the spectrogram visualization.

It accepts the following values:

Channel

Each channel is visualized with different colors per-channel. Works best with combined mode

Rainbow

Spectrogram visualized with not only magnitude, but also phase; the luminance corresponds to amplitude and the hue corresponds to phase

Color gradient

Each channel is visualized with a defined color gradient or a solid color

Default value is Channel.

Refresh rate

Set the refresh rate for this visualization, higher values will use more CPU for high FPS visualization. Default value is Auto, which are set automatically based on monitor's refresh rate up to 120 frames per second.

Transform count

Set the transform count for calculating STFT for every single frame, Higher values will scroll faster, again with more CPU usage. Default value is 6.

FFT

FFT size

Set the FFT size, opting for either better precision at bass frequencies or better temporal precision, but not both.

It also accepts non-power of two sizes like 4410, 8820, 13230 and 17640. Default value is 4096 samples.

Window function

Set the window function

It accepts the following values:

Rectangular

Triangular

Quadratic

Power of sine

Hann

Hamming

Blackman

Nuttall

Gaussian

Kaiser

Welch

Tukey

Exponential

Default value is Hann.

Window parameter

Set the parameter for some window functions; higher values mean better sidelobe attenuation with a wider mainlobe width. Default value is 1.

Window skew

Set the parameter for all window functions, making it asymmetric when the value is non-zero. Positive values skews toward recent data and vice versa. Default value is 0.

Frequency scaling

Frequency scale

Specify which spectrogram use frequency scale, changing distribution of bass and higher frequencies on the display

It accepts the following values:

Linear

Linear frequency scale, used for spotting lossy compression artifacts

Logarithmic

Logarithmic frequency scale, follows the musical notes

Mel

Perceptual frequency scale, opting for linear scale at bass regions and logarithmic scale above

Bark

Based on critical bands, the frequency scale is used for evaluating loudness per-frequency band

Equivaluent rectangular bandwidth

Similar to Mel scale, but skewed more towards bass frequencies

Hyperbolic sine

Adjustable frequency scale, controlled by Hz linear factor parameter

Adjustable logarithmic

Very similar to hyperbolic sine, but with gradual transition between linear and logarithmic frequency scale at the point defined by Hz linear factor

Negative exponential

Starts off as linear frequency scale then it increases exponentially at higher frequencies, even more than logarithmic scale

Adjustable bark

Skewed towards mid frequencies using the same equation as Bark scale

Defaults to Mel.

Hz linear factor

Set the value for adjustable frequency scales. Default value is 50Hz.

Frequency range

Set the frequency range to visualize spectrogram. Default value is 0Hz to 20000Hz.

Amplitude scaling

Output multiplier

Set the output multiplier for the raw FFT magnitude data. Default value is 12dB.

Logarithmic amplitude scale

Specify which uses the dB scaling instead of linear values. Default is True.

Depth

Set the depth of logarithmic amplitude spectrum. Default value is 70dB.

Gamma

Set the factor for scaling the linear amplitude spectrum; higher values shows quieter signals. Default value is 1.