Viewing a Sonogram |
|
Select the portion of the waveform you want to analyze. The sound or note you want to analyze should be in the center of the highlighted area.
Analyzing
long sections of audio can take a long time and lowers the time
resolution, so your selection should be relatively short. Also, if the audio
has a low amplitude level, you can boost it by using the Volume
or Normalize functions.
From the Tools menu, choose Spectrum Analysis. The Spectrum Analysis window is displayed.
Use the Spectrum Settings dialog to select the frequency and amplitude range you want to see.
You
will often have to experiment with different parameters in the
Spectrum Settings dialog to get the best graph possible. Try to
narrow the frequency and amplitude ranges as much as possible to
achieve large contrasts. If the graph is too chunky, raise the Sonogram
resolution setting to approximately 200. For more frequency
resolution, increase the FFT
Size. To decrease processing times, lower the number of
samplings or the FFT Size.
From the Display menu, choose Sonogram (Color) or Sonogram (B&W) to specify whether you want to view a color or black-and-white sonogram.
Drag the slider below the sonogram to adjust the color intensity of the display. The bottom-right corner of the window will show the color scale in dB.
This
function may be fairly slow if you do not have a palletized driver
or if Video for Windows is not installed.
From the Options menu, choose Show Position. As you move the cursor through the sonogram, the amplitude and frequency values at the current position are displayed in a tool tip next to the cursor and in the overview window in the lower left-hand corner of the Spectrum Analysis window:
If
you want to display the the nearest musical note equivalent of the
cursor position in a tool tip, choose Show
Notes from the Options menu.
If you are analyzing a stereo file, choose Sync Graphs from the Display menu to synchronize both displays in a stereo file so you can view the same region of the FFT in both channels.
Select the portion of the waveform you want to analyze. The sound or note you want to analyze should be in the center of the highlighted area.
From the Tools menu, choose Spectrum Analysis. The Spectrum Analysis window is displayed.
From the Display menu, choose Sonogram (color).
The sound you want to analyze should be displayed in shades of red. Hover over the center of the area to display the fundamental frequency.
If upper harmonics exist, they will be displayed as less intense red area above the fundamental, and will usually be multiples of the fundamental (a note at 440 Hz played on an instrument with fairly predictable or even harmonic content will have strong upper hamonics at 880kHz and 1.76kHz).
After
isolating a sound's fundamental frequency, you can use equalization
to emphasize or attenuate the sound.