Rear Panel Of The Ultramatch Pro - Behringer ULTRAMATCH PRO SRC2496 User Manual

6
ULTRAMATCH PRO SRC2496
(18) The SAMPLE RATE switch selects the sampling rate to which the input
signal is to be converted or made available at the outputs. For this purpose,
the SRC2496 must be set to internal mode, i.e. it has to function as a master
unit (see sections (20) and (21) ).
(19) The LEDs 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz and 96 kHz read the sampling
rate selected with the SAMPLE RATE switch. If the sampling rate is preset by
an external wordclock or generated via the digital input signal, the LEDs light
up constantly, thus reading the external sampling rate (with a deviation of
± 2 kHz). The next value (= deviation of >2 kHz) is displayed by one of the
LEDs flashing.
(20) The CLOCK switch allows you to select the source determining the sampling
rate at the digital output of your ULTRAMATCH PRO.
(21) The PLL LOCK LED shows you that your SRC2496 is processing properly the
wordclock signals applied.
The INTERNAL LED lights up when the SRC2496 generates the sampling rate
by itself (master), which is the preferred mode for the ULTRAMATCH PRO
acting as an A/D converter.
The EXTERNAL LED lights up when the sampling rate is governed by an
external wordclock signal. The external mode also allows you to generate
sampling rates at the output that could not be generated by the SRC2496
as a master unit.
When the DIG IN LED lights up, your SRC2496 uses the wordclock signal
included in the digital audio signal fed into the unit. This setting is useful
if you do not want to convert the sampling rate, but only the format of the
digital output signal (S/PDIF to AES/EBU or vice versa).
(22) The FORMAT switch determines the format of the digital data stream on
the output side, as defined in the Channel Status data. Available formats are
AES/EBU and S/PDIF.
(23) The LEDs AES/EBU and S/PDIF show the adjusted output format,
which is present at all three digital outputs. Using an appropriate cable
(see chapter 5.3.5) you could also route an S/PDIF signal from the XLR
output to a second unit, in case the RCA output is already in use.
(24) Use the WORDLENGTH switch to select the digital word length of your choice
(16, 20 or 24 bits).
◊
If you want to set the digital word length to a lower value
(e.g. to record 24-bit signals with 16 bits on CD, MD or DAT),
we recommend that you switch on the dither function, so as to limit
the distortion resulting from the omission of the additional bits to an
inaudible minimum.
(25) The LEDs 24 BIT, 20 BIT and 16 BIT read the word length selected.
(26) The DITHER switch enables/disables the dither function. The corresponding
LED lights up when this function is active. Here's a concise explanation
of the dither function: Whenever analog signals are converted to
digital (numerical values!), the finite number of digits available for the
mathematical description of the analog signals (electrical voltages that
are constant in the time and value domains) inevitably result in rounding
errors and misinterpretations of the analog signals (quantization errors).
In particular, signals with a very small amplitude are affected by an audible
system error known as granular noise. Such errors can be suppressed by
adding white noise. This type of noise has an exactly defined amplitude
(minimum amplitude that can be detected only by measuring instruments
and by no means affects the audio signal) and broadband frequency
distribution, and is called dither signal. Combine this with the high
internal resolution of 24 bits, and you can generate an audio signal of
excellent quality.
Reducing the digital word length (e.g. from 24 bits to 20 bits) also means a
reduction of the resolution. The resulting misinterpretations, which are more
likely to result by this word length reduction can be purposefully suppressed
with the dither function.
(27) The EMPH LED lights up when the emphasis bit has been set in the output
signal. Use the EMPHASIS switch to enable/ disable this function. To avoid
sound deterioration, the LED in the output section should read the same
status as the EMPH LED in the input section. In the rare case of a signal
containing an emphasis bit without any treble boost applied, you can correct
this here and switch off the emphasis bit (detailed information can be found
in chapter 3.4).
(28) The COPY switch (= copyright) allows you to set the status of the copy bits in
the transmitted data stream. The LEDs COPY and ORIG inform you about the
current status of the copy protection:
digital recording only once
COPY-LED on
ORIG-LED on
digital recording not possible
COPY-LED on
ORIG-LED
digital recording unlimited
COPY-LED
ORIG-LED
COPY-LED
ORIG-LED on
Tab. 2.1: Overview of copy bit settings
If both COPY and ORIG light up, you can make one copy only. Subsequently,
the data will be copy protected. If only COPY lights up, digital copies cannot
be made. If both LEDs are out, you can make digital recordings without any
limitations. Press the switch to change the status of the determining bits and
allow for unrestricted copying.
◊
This option applies exclusively to S/PDIF signals, because the
Serial Copy Management System (SCMS) exists in this format only.
Signals based on the professional AES/EBU format can be copied freely.
◊
Even though removing the copyright bit is possible, we would like to
alert you about the fact that copyright and duplication rights must
be safeguarded. We did not produce this equipment to facilitate
illegal copying!

2.2 Rear panel of the ULTRAMATCH PRO

(29) (30)
Fig. 2.6: Mains connector/fuse holder
(29) MAINS CONNECTOR/FUSE HOLDER. Use the power cord supplied with the
SRC2496 to connect the unit to the mains. Please note the instructions given
in chapter 1.2. Blown fuses should only be replaced by fuses of the same type
and rating.
off
off
off
off
(31) (32) (33) (34) (35) (36)