Dolby Laboratories 585 - Manual (Page 29)

Model 585 Time Scaling Processor
4-1
Chapter 4
Pitch Shifting
Pitch shifting, sometimes referred to in other documents as pitch scaling, alters the
perceived frequency of the audio signal from that of the original signal without
altering the duration of the signal.
Pitch shifting is most often used to compensate for a required change in playback rate
of a program, so that the audio is reproduced at the original pitch in spite of the rate
change. Use this equation to calculate the exact amount of pitch shift:
100%
rate frame output
rate frame output - rate frame input
×






Frame mode makes it easy to convert material between different frame rates. The
display indicates when the chosen pitch shift percentage is appropriate for
conversions from 24 fps to 25 fps and from 25 fps to 24 fps.
4.1 Adjusting the Pitch Shifting Value
The pitch shifting function is active in every menu except Transport , unless
Model 585 is in bypass mode. The pitch shifting value can be adjusted in two ways:
in the
Pitch menu, or in the main status menu.
Using the Pitch Menu
To adjust the pitch shifting value using the Pitch menu:
1. Select
Unit Setup
Operating Mode
and press
Enter.