Yamaha 03D - Manual (Page 65)

60 03D Applications
Yamaha 02R & 03D Applications Guide
Wordclocks
When several digital audio devices are configured in a system, it is essential that they are all
synchronized to a single wordclock source. This is not SMPTE or MIDI timecode
synchronization. Wordclock synchronization refers to the synchronization of the digital
audio processing components inside each digital audio device. Typically, one digital audio
device acts as wordclock master and all other devices work as wordclock slaves. The
wordclock frequency is the same as the chosen sampling rate.
Even though some systems appear to work okay with several digital audio devices not
sharing a common wordclock (i.e., all devices set to their own internal wordclock), digital
audio data will not be processed correctly. In some systems this problem will be very
audible. In others it may cause subtle distortion. Be aware of this.
In a system where all devices share a common wordclock, it is important that all devices be
powered on even if just one or two devices are being used. Obviously, the wordclock master
device must be powered on. Before starting a recording session it’s a good idea to make sure
that all wordclock slaves are locked to the master wordclock source. Most devices have front
panel indicators that show whether they are locked to internal or external wordclock.
Setting the 03D’s Wordclock
With the 03D’s internal wordclock generator, industry-standard sampling rates of 44.1 kHz
and 48 kHz are available. When the internal wordclock generator is used, the 03D can be
used as wordclock master, with other digital devices working as wordclock slaves.
Alternatively, the 03D can be used with external wordclock rates of between 32 kHz –6%
and 48 kHz +6%. An external wordclock can be sourced from the DIGITAL STEREO IN,
BNC WORD CLOCK IN, or a pair of YGDAI digital inputs.
1. Use the [DIO] button to locate the D.in Setup page shown below.
2. Use the cursor buttons to select the WORD CLOCK SOURCE options, and
the [ENTER] button to set them. If you are using a mouse, simply click the
options.
If the 03D locks correctly to the selected wordclock source, the respective indicator appears
highlighted.
Note: As the wordclock source is being changed, noise may be produced. So before selecting
a wordclock source, set the stereo output, aux send, and bus out faders to minimum,
turn down your monitor amplifier, and stop all recorders.