RME Audio Hammerfall HDSPe MADIface, Руководство пользователя

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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.