Antares auto-tune-for tdm and vst 用户手册
Auto-Tune UserÕs Manual
13
The Purpose of Pitch Correction
The twelve-tone Equal Tempered Scale consists of tones that are, by deÞni-
tion, 100 cents apart. These are called semi-tones. This scale is the ubiqui-
tous scale used (or rather approximated) in 99.9% of all Western tonal
music. The twelve equally-spaced tones of the Equal Tempered Scale hap-
pen to contain a number of intervals that approximate integer ratios in
pitch. The following table shows these approximations:
tion, 100 cents apart. These are called semi-tones. This scale is the ubiqui-
tous scale used (or rather approximated) in 99.9% of all Western tonal
music. The twelve equally-spaced tones of the Equal Tempered Scale hap-
pen to contain a number of intervals that approximate integer ratios in
pitch. The following table shows these approximations:
As you can see, the intervals in the Equal Tempered Scale are NOT equal to
the harmonious integer ratios. Rather, the Equal Tempered Scale is a com-
promise. It became widely used because once a harpsichord or piano is
tuned to that scale, any composition in any key could be played and no one
chord would sound better or worse than that same chord in another key. In
modern times, synthesizers can generate any intonation at any moment,
allowing the use of ideal pitch ratios when ever they are desired.
the harmonious integer ratios. Rather, the Equal Tempered Scale is a com-
promise. It became widely used because once a harpsichord or piano is
tuned to that scale, any composition in any key could be played and no one
chord would sound better or worse than that same chord in another key. In
modern times, synthesizers can generate any intonation at any moment,
allowing the use of ideal pitch ratios when ever they are desired.
The Purpose of Pitch Correction
When voices or instruments are out of tune, the emotional qualities of the
performance are lost. Correcting intonation solves this problem and
performance are lost. Correcting intonation solves this problem and
Interval
Cents
Nearby
Ratio
Ratio
Ratio
Cents
Cents
minor second
100
16/15
111.73
major second
200
9/8
203.91
minor third
300
6/5
315.64
major third
400
5/4
386.31
perfect fourth
500
4/3
498.04
tritone
600
perfect Þfth
700
3/2
701.95
minor sixth
800
8/5
813.69
major sixth
900
5/3
884.36
minor seventh
1000
16/9
996.09
major seventh
1100
15/8
1088.27
octave
1200
2
1200
TABLE 1.
The Equal Tempered Scale