Audacity spectrogram3/6/2023 ![]() ![]() ![]() For small signals where the display is mostly "blue" (dark) you can increase this value to see brighter colors and give more detail. Gain (dB): This enables you to increase / decrease the brightness of the display.A good use of this setting is in speech recognition or pitch extraction, where you can hide the visually unimportant highest frequencies and focus on the lower frequencies. ![]() Irrespective of the entered value, the top of the scale will never exceed half the current sample rate of the track (for example, 22,050 Hz if the track rate is 44,100 Hz) because any given sample rate can only carry frequencies up to half that rate. The value can be set to 100 Hz or any higher value. ![]() Maximum Frequency: This value corresponds to the top of the vertical scale.The default value of "0" here will be treated as "1" when using "Spectrogram Logarithmic" view mode because a logarithmic scale cannot start at zero. Frequencies below this value will not be visible. Minimum Frequency: This value corresponds to the bottom of the vertical scale in the spectrogram.It is for making the same displays of Pitch possible as in earlier versions of Audacity. Period: is the previously undocumented scale used by Pitch (EAC) view.It is implemented as a function ERBS(f) which returns the number of equivalent rectangular bandwidths below the given frequency "f". 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.It is related to, but somewhat less popular than, the Mel scale. Bark: This is a psychoacoustical scale based on subjective measurements of loudness.Mel: The name Mel comes from the word melody to indicate that the scale is based on pitch comparisons.See Spectrogram View for a contrasting example of linear versus logarithmic spectrogram view. Logarithmic: This view is the same as the linear view except that the vertical scale is logarithmic.Linear The linear vertical scale goes linearly from 0 kHz to 8 kHz frequency by default.The best way to enable and disable spectral selection. Zoom-to-selection and drag-zoom should fit the parallelogram, not the rectangle.The gray background rectangles and sync-lock pocket watches should appear as parallelograms in such a view.The curves would in this case pass under the cursor, not exactly through. This would draw one curve of equal time as for the play indicator and perhaps another for a curve of constant frequency. Rather than complicate the interpretation of mouse position further (correcting frequency as well as time), it might be easier to have a "crosshair" that follows mouse position to indicate what you would really select. If you have an exaggerated vertical scale (as in the illustrations), the confusion gets worse. If you point at a "peak" of the graph for spectral selection, you are not selecting that frequency: you must instead point at the bottom of the hill.Perhaps similar should be done for the guides of the zoom tool, and for the yellow snap lines that appear when selecting, but not for the yellow snap lines for time-shift tool. The play indicator, quick play line, and point cursor should no longer be drawn as a simple vertical when crossing such a view, but instead follow the curve of equal time.I think this correction should not apply to time-shift, however, because a clip can be dragged to another track, and it would only get confusing if corrections applied sometimes here but not there. The same should also apply to clicks to zoom in, and to ctrl-mousewheel which determines a center of zooming. When selecting or scrubbing in such a view, the time deduced from mouse position should be corrected for the slant, depending on the y coordinate of the mouse.The same with less exaggerated perspective and in "Solid" view and a different choice of grid lines - "31 bands" corresponding to the graphic equalization sliders. Crests and grid lines obscured from view in the previous image now appear faded. The same except for "translucent" or wireframe style. The "slope" and "height" perspective parameters are exaggerated. Waterfall view of about two seconds of speech in "Opaque" or hidden-line removal style, with gridlines at octaves. I just know it looks super cool, and was easier to implement so far than it looks. Is there any clamor for this from the users? Will this really be useful to anyone in editing practice? Hard for me to say. The usual view uses color as a third axis. Note: Proposals for Google Summer of Code projects are significantly different in structure, are submitted via Google's web app and may or may not have a corresponding proposal page.Ī waveform is a two-dimensional plot of level against time, but a spectrogram is a three-dimensional plot of power against time and frequency. ![]()
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