Steinberg WaveLab Elements 7 Manual descarregar pdf (Página 270)

256 Interface Elements

Ogg Vorbis ﬁles

11.1.35 Global analysis

This dialog allows you to perform advanced analysis on your audio to identify areas with spec-

iﬁed properties. It can be used to ﬁnd problem areas such as glitches or clipped samples,

or just to check general information such as the pitch of a sound.

How it works When you analyze a section of an Audio File, WaveLab scans it and extracts

information which it displays in the dialog. It also "pin-points" sections of the ﬁle that meet

speciﬁc characteristics, for example, sections being very loud or almost silent. You can then

browse between these points, set markers or zoom in on them.

Types of analysis On most of the tabs, you will ﬁnd settings determining exactly how the

analysis will be performed. Each tab focuses on a particular analysis area:

Peaks - this tab is for ﬁnding individual samples with very high decibel values.

Loudness - this tab is for ﬁnding sections that are perceived by the human ear as

louder or weaker in volume. WaveLab uses an accurate method (RMS - Root Mean

Square), to measure a consecutive section of samples and then average their value.

Pitch - this tab is used for ﬁnding the exact average pitch of a section of audio. The

method works best on monophonic material (single notes, without chords or harmonies)

and assumes the analyzed section has a relatively stable pitch. As a general rule try to

analyze the sustain portion of a sound, rather than the attack.

Extras - this tab is for informing you about DC offsets and the signiﬁcant bit resolution

of the ﬁle. This can be useful, for example, if you wanted to check whether a 16 bit

ﬁle really uses 16 bits (or if it was actually recorded with only 8 bit resolution and then

upscaled to 16 bits).

Errors - this tab is to help you ﬁnd glitches and sections where the audio has clipped

(gone beyond 0 dB).For more control over the analysis, use Error detection and cor-

rection. Checking and browsing the results Checking the results on the Pitch and

Extra tabs is simple, since only one value is returned for the whole section of analyzed

audio. For all the other tabs, the analysis methods returns a series of exact points ("hot

points") in the ﬁle or section of audio. Use the relevant buttons in each tab to select the

"hot points" you wish to look at in more detail. Using the slider you can then browse

or skip between these points, adding markers or focusing the waveform display at that

particular point in the ﬁle.

You can access this dialog in the Audio File Workspace via Analysis > Global Analysis....

For an explanation of each parameter and interface feature, click on , or the 'What's this?'

question mark icon. For more information see Getting Help

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Steinberg WaveLab Elements 7 Manual Página 270