6.0

Menu Effects
401
Change Sample Rate
Use this function to change the sample rate of a whole audio
file. This may be needed to convert a DAT recording at 48
kHz to 44.1 kHz for use on an audio CD.
After choosing the new sample rate you can select a
filename for the new project.
If the resolution is increased the sample rate change will
take place without any quality loss – the sample material
will not experience fidelity reductions. (The needed hard
disk space will increase though.)
If the resolution is reduced, the overtones or high frequen-
cies may be lost during the sample rate change. For exam-
ple, if the resolution of a 44.1 kHz sample is reduced to
22.05 kHz, the frequency response of the resulting sample
is reduced to 11.025 kHz. The frequency response is always
half of the resolution specified. For a conversion from a 48
kHz sample to 44.1 kHz, this loss in quality is not signifi-
cant, since the human ear only recognizes frequencies up
to 20 kHz. (A resolution of 48 kHz is often only used be-
cause the digital to analog conversion can take place with
much higher precision without expensing a lot of effort.)
Please note that resampling to 44.1 kHz can also be done
while recording in real-time.
The Playback Parameter window (Shortcut: p) contains a
Varispeed option for real-time resampling during playback.
The Record window (Shortcut: r) lets you resample to 44.1
kHz in real-time from any of the selected sampling rates.
Sample manipulation > Sampledata / 2
Every second sampling value is removed and the complete
sample is reduced to half its length. The audible pitch is
doubled, i.e. raised by one octave. When halving the sam-
pling rate you will notice that the corresponding upper har-
monics are missing.
The frequency range is divided (i.e. 0-22.05 kHz @ 44.1
kHz Sample Rate -> 0-11.025 kHz @ 22.05 kHz).
Sample manipulation > Sampledata * 2
This function inserts a new value between two neighboring
sampling values. It is the average of the two sampling val-
ues.
The complete sample changes to twice it’s length and the
resulting pitch of the sample is cut in half. You must then
double the playing rate to achieve the former pitch.
You should note that the higher sample rate does not lead
to new upper harmonics – the frequency range of the audio
material stays the same.