![]() 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 20 kHz frequency by default.This option has no effect and is grayed out when the Pitch (EAC) algorithm is selected. Zero padding factor: Larger values give finer interpolation of the colors along the vertical axis, at the expense of more computation time.All methods give broadly similar results. 'Rectangular' is slightly faster than other methods, but introduces some artifacts. Window type: Determines precisely how the spectrogram is computed.Larger FFT window sizes give more low frequency resolution and less temporal resolution, and are slower. Window Size: The dropdown menu lets you choose the size of the Fast Fourier Transform ( FFT) window which affects how much vertical ( frequency) detail you see.The aim was to allow automated comparison of sound files so that two versions of the same tune could be recognized as being similar, even if played in different keys, or on different instruments. The EAC Algorithm was developed to produce a mathematical representation of the changes of pitch in a piece of audio. Pitch (EAC): Highlights the contour of the fundamental frequency (musical pitch) of the audio, using the Enhanced Autocorrelation (EAC) algorithm.This mapping to reassigned time-frequency coordinates is very precise for signals that are separable in time and frequency with respect to the analysis window. Reassignment: The method of reassignment sharpens blurry time-frequency data by relocating the data according to local estimates of instantaneous frequency and group delay.Measured in Hz, higher frequencies have higher pitch. Frequencies (default): Audio frequency determines the pitch of a sound.Scheme: Choice of two colorways or two grayscale settings. ![]() You get less gain at lower frequencies as well. Frequency Gain (dB/dec): A positive value here gives some extra gain to higher frequencies (above 1,000 Hz), as they tend to be smaller and so cannot be seen as well.The default is 80 dB and means that you will not see anything for signals 80 dB below the value set for "Gain". Range (dB): Affects the range of signal sizes that will be displayed as colors.The default is 20dB and corresponds to a -20 dB signal at a particular frequency being displayed as "white". If the display has too much "white", decrease this value. ![]() For small signals where the display is mostly "blue" (dark) you can increase this value to see brighter colors and give more detail.
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