oxAnalysis A graphic tool for frequency and dynamic range analysis and estimation
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oxAnalysis Description

A graphic tool for frequency and dynamic range analysis and estimation Installation: A Max/MSP Collective is a cross-platform application that provides digital signal processing tools within the Max/MSP Runtime application. To use a Max/MSP Collective, first, start the Max/MSP Runtime application; second, open the desired Collective (.mxf) file from the Max/MSP Runtime application File menu. The main parts and characteristics of the oxAnalysis are described in detail below:Master Audio Controls: This is the main audio control interface. Press the space bar to toggle audio processing. Audio processing must be activated with the space bar for any sound to be heard. A circle next "on" indicates that audio processing is inactive; a plus indicates that audio processing is active. When the "toggle" check-box is selected (by default) audio processing can be turned on and off with the space bar. To the left of these controls are drop-down menus to select audio drivers and input and output vector sizes. The four sliders on the left of this interface control the main outputs of channels 1 through 4. These sliders can be adjusted to set master output levels. The "0dB" drop-down menu can be used to change all output levels simultaneously. If additional audio controls are necessary, the "dsp" drop-down in the upper right corner can be pressed to open a window with additional options. Sample Player: This interface allows loading an audio file for playback. Selecting "replace" from the drop-down menu on the right of the interface will provide the user with a file-dialogue to select an audio file. Press the "start" button, under the "trigger" label, to play the sample. To loop the sample, select the plus from the drop-down menu under the "loop" label. Playback speed can be adjusted with the number-box labeled "speed" (where 1 is forward, -1 is backwards). Playback speed may be modulated by altering oscillation frequency and depth ("oscFq" and "oscDepth"). Output level can be adjusted with the "postGain dB" control. Audio Input Control: This interface configures audio input from the currently-selected audio interface. Input one is assumed, but alternative input numbers can be selected from the drop-down menu. Input gain can be adjusted with the left-most slider. When the drop-down menu on the right is set to a plus, other signals are bypassed and the input signal is output. By default, audio input is inactive. Variable Filter: This interface allows numerous different filter shapes to be selected and configured. By default, processing is not active: select the plus from the drop-down menu to turn on processing. Filter shapes can be selected with the drop-down menu in the lower left. Available filter shapes include "lowpass", "highpass", "bandpass", "bandstop", "peaknotch", "lowshelf", "highshelf", and "flat". The filter parameters can be altered by clicking and dragging in the filter display, or by using the labeled number boxes ("fq", "dB", "q", and "postGain dB"). Spectral Analysis Parameters: This display provides a spectral analysis of the signal. The frequency scale can be toggled between linear and logarithmic with the drop-down menu. The interval of analysis, in milliseconds, can also be adjusted. The black bars control the amplitude of sine waves, tuned at the specified frequency, for use as grid lines. Dynamic Range Analysis Parameters: The right region of this display shows the moving RMS amplitude of the signal. The drop-down menu permits the rate of averaging to be configured in milliseconds. The two left regions, using sine waves, provide reference values for setting two RMS dB boundaries.

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