RME HDSP 9632 [18/87] Settings dialog dds

User's Guide HDSP System HDSP 9632 © RME

11.2 Settings dialog - DDS

Usually soundcards and audio interfaces generate their internal clock (master mode) by a

quartz. Therefore the internal clock can be set to 44.1 kHz or 48 kHz, but not to a value in be-

tween. SteadyClock, RME's sensational Low Jitter Clock System, is based on a Direct Digital

Synthesizer (DDS). This superior circuitry can generate nearly any frequency with highest pre-

cision.

DDS has been implemented into the HDSP 9632 with regard to the needs of professional video

applications, as well as to maximum flexibility. The dialog DDS includes both a list of typical

video frequencies (so called pull up/pull down at 0.1% and 4%) and two faders, which allow to

freely change the basic sample rate in steps of 1 Hz (!).

The DDS dialog requires the HDSP 9632 to be in clock mode Master! The frequency set-

ting will only be applied to this one specific card!

Changing the sample rate in bigger steps during record/playback often results in a loss of

audio, or brings up warning messages of the audio software. Therefore the desired sample

rate should be set at least coarsely before starting the software.

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).