4 Chapter 2 : CBX-D5 Terminology4 Chapter 2 : CBX-D5 Terminology4 Chapter 2 : CBX-D5 Terminology
Sampling frequency (REC FREQ)
During the analog to digital conversion process, the level of the analog audio signal is
sampled (measured) many times per second. Each of these sample measurements is then
stored as a 16-bit binary value. For digital to analog conversion (playback), these 16-bit
binary values are used to reconstruct the analog audio signal. The rate at which these
sample measurements take place is called the sampling frequency and you may already
know that the sampling frequency used by CD players is 44.1kHz.
The CBX-D5 can record audio using any one of four sampling frequencies: 48kHz,
44.1kHz, 32kHz, and 22.05kHz. The audio quality (bandwidth) of a digital system is
directly affected by the sampling frequency. Essentially, the audio bandwidth will be
roughly half the chosen sampling frequency. See “Sampling frequency (REC FREQ)” on
page 20 for more details.
Word clock
When a number of digital audio devices are connected together and data is digitally
transferred between them, it is essential that the data processing circuits of all devices are
synchronized. To achieve this, one device operates as a word clock master and all other
devices operate as word clock slaves. The frequency of the word clock corresponds
directly to the digital audio data’s sampling frequency.
If you only connect two digital audio devices, say the CBX-D5 to a DAT recorder, w ord
clock setup is quite straight forward and no word clock connections will be required.
However, when three devices are connected, serious thought will need to be given as to
which device is word clock master and how to make the word clock connections. See
“WORD CLK IN/OUT” on page 28 for more details.
To Host
An 8-pin mini DIN connector that allows direct connection to a computer that is running
CBX-D5 supporting software. This can be used when your computer does not have a
MIDI interface, i.e. MIDI input and output connections. See “TO HOST connection” on
page 30 for more details.
NOTE: Word clock signals should not be confused with other synchronizing signals
such as SMPTE timecode and MTC (MIDI Timecode). Although both may
be used in a digital audio system, word clocks are for synchronizing digital
audio data processing circuits such as CPUs, D/A, A/D converters, etc., while
SMPTE and MTC timecodes are for synchronizing audio and video tape
machines, MIDI sequencers, etc., relative to time – hours, minutes, seconds,
and frames.
NOTE: Not all CBX-D5 supporting music software can use this type of connection,
so please consult your Yamaha dealer before making a purchase.