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CD3000XL OperatorÕs Manual Page 145
DSP FUNCTIONS - TIMESTRETCH, RE-SAMPLING AND EQ
The CD3000XL has three powerful digital signal processing (DSP) functions which are
accessed via the key in the main SLCT page.
TIMESTRETCH
Timestretch allows you to alter the length of a sample, shortening it or lengthening it, without
changing its pitch. Before we look at how to operate the timestretch functions on the
CD3000XL, let us first look briefly at how timestretch works.
Timestretch works by instructing the digital signal processor to analyse the signal and insert or
delete blocks of sample data at appropriate places and crossfades are used to make the
insertions and deletions as seamless as possible. This has the effect of lengthening or
shortening a recording. As you can see from the following diagram, blocks of sample data have
been inserted to create a 200% timestretch. The overall envelope of the sound data is
preserved but there is twice as much data in it causing it to play back twice as slow.
SAMPLE DATA BLOCKS
OO
OO
RR
RR
II
II
GG
GG
II
II
NN
NN
AA
AA
LL
LL
RR
RR
EE
EE
CC
CC
OO
OO
RR
RR
DD
DD
II
II
NN
NN
GG
GG
WW
WW
II
II
TT
TT
HH
HH
22
22
00
00
00
00
%%
%%
TT
TT
II
II
MM
MM
EE
EE
SS
SS
TT
TT
RR
RR
EE
EE
TT
TT
CC
CC
HH
HH
In the following diagram, data has been carefully removed to make the recording play back
faster.
OO
OO
RR
RR
II
II
GG
GG
II
II
NN
NN
AA
AA
LL
LL
RR
RR
EE
EE
CC
CC
OO
OO
RR
RR
DD
DD
II
II
NN
NN
GG
GG
77
77
00
00
%%
%%
TT
TT
II
II
MM
MM
EE
EE
SS
SS
TT
TT
RR
RR
EE
EE
TT
TT
CC
CC
HH
HH