The Power Spectrum Analyzer is the analytical engine of AudioExplorer. Settings affecting the Spectrum Analyzer are found in three places. The settings under Algorithms/Power Spectrum affect the interactive spectrum generation and the generation of spectra for Spectral Files, Frequency Maps, and Note Maps. The Spectrum Analyzer is also active during audio recording and playback, and those settings are independently customizable (see Audio/Recording and Audio/Playback).
| Interactive Analyses
An interactive analysis occurs after selecting a region of an audio waveform. Based on the selection, audio samples extracted from the audio file and submitted for Fourier Transform Analysis. If a large region of the audio waveform is selected, the # samples extracted could be so large as to lead to lengthy delays while the analysis is performed. To prevent this, AudioExplorer limits the # samples extracted. When the number of selected audio samples exceeds this limit, AudioExplorer skips samples (e.g., uses every other sample, or every third sample, or every fourth sample, etc.) so as to prevent the total # samples analyzed from exceeding the preferred maximum.
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Maximum # samples: |
Enter the maximum # audio samples to be sent for Fourier Transform during interactive analysis. |
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| Spectral File Analyses
When Spectral Files, Frequency Maps, or Note Maps are generated, AudioExplorer scans the entire audio file and performs (typically) thousands of power spectrum analyses on successive stretches of the audio data. The Power Spectrum Analysis is an extension of the Fourier Analysis which includes various statistical operations to reduce noise and artifacts from the final result.
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Change... |
Invoke the Power Spectrum Analyzer Options dialog to adjust settings for Spectral File and NoteMap generation. |