Orinj Spectrum monitor

Orinj version 4.0.0

The Orinj Spectrum monitor (or spectrum analyzer) is a monitoring tool that shows the amplitude of frequencies in its input signal (the magnitude response of the signal) at a point in time. It uses the Orinj effect framework and works similarly to all other DSP effects, but it only displays information about the sound signal and does not modify the signal.

Using the Orinj Spectrum monitor

The Orinj Spectrum monitor can be added to tracks in the multitrack session view, tracks in the loop building view, and to waves in the single wave view. In the multitrack session view and in the loop building view, first select the track to which you want to add the effect. In all views, click on Effect, Other, and then on Orinj Spectrum Monitor in the Orinj menu. You will see the following dialog.

The Orinj spectrum monitor dialog

When this dialog becomes visible, the Orinj Spectrum monitor has been added.

The horizontal axis of the spectrum monitor is the frequency range, which changes depending on the sampling rate (larger sampling rates permit larger frequency ranges, up to half of the sampling rate, per the Nyquist-Shannon sampling theorem). Since the human ear perceives frequencies exponentially (i.e., a note in an octave has double the frequency of the same note in the lower octave), the frequency bands in the spectrum monitor split the frequency range exponentially. The vertical axis is the amplitude of the frequency bands. This amplitude range uses decibels and ranges between -60 dB (bottom) and 0 dB (top), where 0 dB represents the maximum amplitude permitted by the signal sampling resolution.

Note that the Orinj spectrum monitor operates during playback, but not according to the precise playback timing. In the Orinj effect framework, effects process and prepare the sound data before these data are sent to the output sound device. The spectrum monitor similarly computes information on what should be drawn before the corresponding sound data is sent to playback. It then attempts to show this information at the time of the corresponding playback. The Orinj effect framework, however, does not permit the Orinj effects to be aware of the playback time. The Orinj spectrum monitor may display sound data earlier than its playback and may occasionally wait for data.

Orinj Spectrum monitor parameters

The Orinj Spectrum monitor has no parameters. It simply displays a plot of the sound data during playback.

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