Bedienungsanleitung Korg SoundLink DRS 1212 I-O (Seite 25 von 58) (Englisch)

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System Configurations

Korg 1212 I/O 21

English

When one device sends out a bit of data (like the ball being thrown to the

other juggler), the other needs to be ready to receive it. If the data is being

sent even just slightly faster than it can be received, bits will be lost,

causing errors in the audio (like the ball being dropped).

Similarly, if the data is being sent even slightly slower than the receiver

expects it to be, then the receiver will occasionally be left without real data

at its input (like a juggler grabbing at the air). In digital audio, these errors

show up as loud pops and clicks, as well as lower-level noise.

The rate at which those bits are sent and received is controlled by the word

clock, which “ticks” for every bit of data. Each device has its own word

clock, so that it can work on its own–such as a single ADAT, or a single

1212 I/O.

When you send digital audio data between two devices, however, their

word clocks need to be synchronized together, so that devices send and

receive each bit at the exact same moment. One of the devices–usually the

sender–will provide the master clock; the other will ignore its internal

clock, and instead slave to the master clock.

This clock signal is normally carried along with the digital audio data, so

that when connecting two devices together in a simple conﬁguration–such

as dubbing between two DAT machines–you don’t need to make any other

connections. Sometimes, however, it is necessary to send the word clock

separately from the digital audio data–as in the case of the BRC, for

example.

As part of the BRC’s master control functions, it provides the word clock

for the connected ADAT system; since the BRC does not actually send or

receive audio data, it sends the word clock through the ADAT sync cables.

To control the BRC’s word clock–necessary when transferring audio from

S/PDIF to ADAT, for example–you must use a separate word clock

connection to synchronize the BRC to the S/PDIF source.

Editing ADAT audio off-line

As explained above, a digital audio device’s word clock controls the speed

of the digital audio bit-stream, and unless the clocks of two devices are

explicitly synchronized, they will tend to run at slightly different speeds.

This means that the same DAT tape, played in two different, un-

synchronized DAT machines, will play slightly slower in one of the

machines–and thus will play for a slightly longer time. The difference will

be so slight that you almost certainly couldn’t hear it in isolation, but if you

made an exact copy of the tape and played the two tapes back at the same

time on un-synchronized machines, you’d notice that they would drift

apart over time.

The same thing can happen when transferring audio data from an ADAT

system to the 1212 I/O. As long as ADAT is select as Clock Source for the

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