Time Compression - Yamaha D24 Owner's Manual

Time Compression

The Time Compression function is used to stretch or squeeze recorded material with-
out affecting its pitch. For example, a 34-second section of material could be squeezed
to fit a 30-second video scene.
Individual tracks or a pair of tracks can be processed simultaneously. To process all
eight tracks, Time Compression must be run four times, selecting a different pair of
tracks each time. The selected material is stretched or squeezed and the result is
recorded to the specified virtual track, from which it can be copied or moved to its des-
tination track. The source material is not overwritten.
The following points, which can be adjusted in sub-frame steps, can be selected when
specifying the edit points: LAST REC IN, LAST REC OUT, A, B, or a locate memory
from 1 through 99. Note that you must set these points before entering the Time Com-
pression function. See the Quick Locate Chapter on page 57 for more information
about setting these points.
Press the [EDIT] button.
1
The EDIT indicator lights up.
Use the JOG/DATA dial to select "TIME COMP," and then press the [ENTER]
2
button.
"TYPE—GENERAL" appears on the display ("GENERAL" being the selected process-
ing algorithm).
Use the JOG/DATA dial to select a suitable algorithm.
3
The following algorithms are available:
GENERAL —suitable for use with a variety of material.
VOCAL —optimized for use with vocals.
RHYTHM —optimized for use with rhythm material, such as drums and percussion.
Press the [ENTER] button.
4
"RATIO—RATIO 100.00" appears on the display ("100.00" being the time compres-
sion ratio expressed as a percentage).
You can calculate the required ratio by dividing the desired length by the current length
and multiplying by 100. For example, to squeeze a 34-second part to 30 seconds, a ratio
of 88.23% is required (e.g., 30 34 100 = 88.23).
Use the JOG/DATA dial or keypad to set the time compression ratio from 50%
5
to 200% (150% for the RHYTHM algorithm) in 0.01 steps, and then press the
[ENTER] button.
"MODE—TEST PLAY" appears on the display.
Use the JOG/DATA dial to select a mode: "TEST PLAY" or "REC."
6
Test Play mode allows you to audition the selected track with the specified time com-
pression ratio, while Rec mode is used to perform the actual time compression and
record the result to a virtual track.
When auditioning a track with the VOCAL or RHYTHM algorithm and a compression
ratio of less than 90% or higher than 110%, the audition sound quality is impaired
slightly. The audio quality for recording is not affected.
111

Time Compression

D24—Owner's Manual