Alesis Hammerfall DSP System 用户手册

 

 

User's Guide HDSP MADI

 © RME

31

 

 
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 MADI 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 MADI 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 activated 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 activate 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).