Master Clock; Digital Out - TerraTec PHASE 22 Manual

Master Clock

Here we're dealing with the sample rate used by the PHASE 22 audio interface. This is a
very important point, as the system can be clocked by an external signal (External, e.g.
from a DAT recorder) or it can set a sampler rate itself and provide this signal to other
devices.
You can choose from all commonly used sampler rates from 32 to 192 kHz - the actual bit
rate is not important at this point. In the case of external synchronization (i.e. via a signal
applied to the digital interfaces or the internal connection to cascade multiple cards), the
external sampler rate will be displayed. If no signal is available or the connection has
been interrupted, the message "No Sync" will be returned.
The "Samplerate locked" switch also allows you to set the sampling frequency to a
specified value (or when using external synchronization, the externally preset value). Do-
ing so ensures that only this sample rate will be accepted by the PHASE 22 system.
However, remember that in "non-ASIO" mode, the operating system's own sampling rate
converter (SRC) may convert automatically to the required values. Example: The PHASE
22 PCI card is set to 44.1 kHz and Windows Media Player, or I-Tunes on MAC OS X sys-
tems, is playing a 48-kHz file. In this case, the signal is down-sampled to 44.1 kHz, and
every form of SRC leads to a certain degree of quality loss.
Practical tip: The audio controller of the PCI card does not fea-
ture a sample rate converter. This module - which is common on
consumer sound cards - normally lets you play back signals with a
variety of sampler rates by "interpolating", as needed, the sample
rates in real time to a specific frequency. This process is now con-
trolled by the operating system. Therefore, make sure when out-
putting your production (if not earlier) that the sampling rate of
your project matches the audio interface's sampling rate.

DIGITAL OUT

As in the drop-down menu of the Analog Out area, here you can select one of three sig-
nals for digital output: the analog input, its digital counterpart, or the WAVE output (in
other words: your audio application).
32 PHASE 22 (English)