ALESIS Hammerfall DSP System - Manual (Page 16)

16
User's Guide HDSP MADI © RME
DDS
Activates all settings of this dialog.
Value
Shows the sample rate as adjusted in
this dialog. The sample rate is defined
by the basic setting (frequency), the
multiplier, and the position of the acti-
vated fader.
Frequency
Sets a fixed basic sample rate, which
can be modified by multiplier and fader.
Freq. Multiplier
Changes the basic sample rate into
Single, Double oder Quad Speed mode.
Coarse
Fader for coarse modification of the
basic sample rate. Click Active to acti-
vate it. Minimum step size 1 Hz.
Fine
Fader for fine modification of the basic
sample rate. Click Active to activate it.
Minimum step size 1 Hz.
Notes on the faders
A mouse click within the fader area, above or below the fader know, will move the fader with the
smallest step size up or down. Holding the Ctrl key while clicking will cause the fader to jump to
its center (0) position.
11.3 Clock Modes - Synchronisation
AutoSync
The HDSP MADI has been equipped with AutoSync, an automatic clock source selection, which
adopts the first available input with a valid digital signal as the clock reference input. The input
currently used as sync reference is shown in the AutoSync Ref status field, together with its
current sample frequency.
AutoSync guarantees that normal record and record-while-play will always work correctly. In
certain cases however,
AutoSync may cause feedback in the digital carrier, so synchronization
breaks down. To remedy this, switch the HDSP’s clock mode over to 'Master'.
Via Pref. Sync Ref (preferred synchronization reference) a preferred input can be defined. As
long as the card sees a valid signal there, this input will be designated as the sync source, oth-
erwise the other inputs will be scanned in turn. If none of the inputs are receiving a valid signal,
the card automatically switches clock mode to ‘Master’.
Thanks to its AutoSync technique and lightning fast PLLs, the HDSP is not only capable of han-
dling standard frequencies, but also any sample rate between 28 and 105 kHz. Even the word
clock input, which most users will use in varispeed operation, allows any frequency between 28
kHz and 105 kHz.