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20.2 Settings dialog - DDS<br />
Usually soundcards and audio interfaces generate their internal clock (master mode) by a<br />
quartz. Therefore the internal clock can be set to 44.1 kHz or 48 kHz, but not to a value in between.<br />
SteadyClock, <strong>RME</strong>'s sensational Low Jitter Clock <strong>System</strong>, is based on a Direct Digital<br />
Synthesizer (DDS). This superior circuitry can generate nearly any frequency with highest precision.<br />
DDS has been implemented into the H<strong>DSP</strong> <strong>9632</strong> with regard to the needs of professional video<br />
applications, as well as to maximum flexibility. The dialog DDS includes both a list of typical<br />
video frequencies (so called pull up/pull down at 0.1% and 4%) and two faders, which allow to<br />
freely change the basic sample rate in steps of 1 Hz (!).<br />
The DDS dialog requires the H<strong>DSP</strong> <strong>9632</strong> to be in clock mode Master! The frequency setting<br />
will only be applied to this one specific card!<br />
Changing the sample rate in bigger steps during record/playback often results in a loss of<br />
audio, or brings up warning messages of the audio software. Therefore the desired sample<br />
rate should be set at least coarsely before starting the software.<br />
DDS<br />
Activates all settings of this dialog.<br />
Value<br />
Shows the sample rate as adjusted in<br />
this dialog. The sample rate is defined<br />
by the basic setting (Frequency),<br />
the multiplier, and the position<br />
of the activated fader.<br />
Frequency<br />
Sets a fixed basic sample rate, which<br />
can be modified by multiplier and<br />
fader.<br />
Freq. Multiplier<br />
Changes the basic sample rate into<br />
Single, Double oder Quad Speed<br />
mode.<br />
Coarse<br />
Fader for coarse modification of the basic sample rate. Click Active to activate it. Minimum<br />
step size 1 Hz.<br />
Fine<br />
Fader for fine modification of the basic sample rate. Click Active to activate it. Minimum step<br />
size 1 Hz.<br />
Notes on the faders<br />
A mouse click within the fader area, above or below the fader know, will move the fader with<br />
the smallest step size up or down. Holding the Ctrl key while clicking will cause the fader to<br />
jump to its center (0).<br />
User's Guide H<strong>DSP</strong> <strong>System</strong> H<strong>DSP</strong> <strong>9632</strong> © <strong>RME</strong> 35