User`s guide

User's Guide HDSPe MADIface © 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 MADIface with regard to the

needs of professional video appli-

cations, as well as to maximum

flexibility. The dialog DDS includes

both a list of typical video frequen-

cies (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

(!).

Application examples

DDS allows for a simultaneous

change of speed and tune during

record and playback. From align-

ment to other sources up to crea-

tive effects – everything is possi-

ble.

DDS allows to intentionally de-tune

the complete DAW. This way, the

DAW can match instruments which

have a wrong or unchangeable

tuning.

DDS allows to define a specific

sample rate. This feature can be is

useful in case the system randomly changes the sample rate – for unknown reasons. It also

prevents a change from Double Speed (96 kHz) to Single Speed (48 kHz), which would cause

configuration and routing problems by the changed amount of MADI channels.

The DDS dialog requires the MADIface to be in clock mode Master! The frequency setting

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.