User`s guide

User's Guide ADI-192 DD © RME

The function RANGE tells the SRC which frequency its input signal has. The frequency

of its output signal (the frequency the input signal shall be converted to) is defined in the

CLOCK SECTION.

More information is found in chapter 8, Sample Rate Converter.

5.3 CLOCK SECTION

The source and frequency of the unit's clock is configured in the CLOCK SECTION. The button

CLOCK lets you step through the options external clock (AES, TDIF, ADAT, word) and internal

clock (44.1 or 48 kHz). The button STATE sets internal, but also the external sample rate to

double or quadruple of the basic sample rate.

AES, TDIF, ADAT (Slave Mode)

ADAT, TDIF or AES input can serve as the clock reference. The choice is independent from the

processed audio signal. If the unit is currently used as TDIF to ADAT converter, the clock

source can still be AES, given that a valid AES signal is available. A missing or invalid clock

source signal is indicated by flashing of the corresponding LED.

WCK (Slave Mode)

Selects the word clock input as clock reference. The LED flashes in case the word clock signal

is missing or invalid.

44.1, 48 (Master Mode)

Activates the internal clock at 44.1 kHz or 48 kHz. Using the button STATE a choice of DS giv-

es 88.2 and 96 kHz, a choice of QS gives 176.4 and 192 kHz respectively.

With a setting of 44.1 and 48 (internal clock) it is mandatory that the clock rate of the

sources is synchronous to the ADI-192 DD. Therefore the external device has to be syn-

chronized to the ADI-192 DD's word clock out or AES/TDIF/ADAT out.

The ADI-192 DD thus has to be master, all devices connected to it slave (exception: the SRC

mode). In order to avoid clicks and drop outs due to faulty or missing synchronicity, a special

process called SyncCheck compares the incoming data and the ADI-192 DD's internal clock.

The SYNC state is indicated by a flashing (error) or constantly lit (OK) LED.

The button STATE is used to configure the ADI-192 DD, and with this all of its outputs, to the

frequency ranges Single Speed, Double Speed or Quad Speed.

Single Speed (no LED)

All outputs carry a signal in the range of 32 kHz up to 48 kHz.

Double Speed (LED DS)

All AES outputs carry a signal in the range of 64 kHz up to 96 kHz, except for an activated op-

tion DW in AES OUTPUT. ADAT and TDIF stay at no higher than 48 kHz, but the data is trans-

mitted in the S/MUX format.

Quad Speed (LED QS)

All AES outputs carry a signal in the range of 176.4 kHz up to 192 kHz, except for an activated

option DW or QW in AES OUTPUT. ADAT and TDIF stay at no higher than 48 kHz, but the data

is transmitted in the S/MUX4 format.

Follow Clock

In this special mode the ADI-192 DD follows the input clock of AES and Word automatically

over all three ranges. So at 96 kHz the DS LED automatically lights up, at 192 kHz the QS LED.

A manual configuration via the STATE button is no longer required. This function is deactivated

for the ADAT and TDIF input, as the sample rate range of these formats can not be detected

automatically.