Stereo192SRC operating instructions 2006 PDF

Stereo192SRC operating instructions 2006 PDF
MYTEK SRC192 OPERATION INSTRUCTIONS
Stereo192src allows for set up of following parameters:
1.
2.
3.
4.
5.
active input
display of input or output frequency within 1 Hz
output signal clock reference
output wordlenght
output frequency value within 1Hz
1. Input selection
There are three choices for input selector labeled “IN”:
•
•
•
AES
SPDIF
TOSLINK
When input is properly the led is solid. Blinking led means there is no proper digital input present.
2. Selecting what's displayed on numerical display
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•
F-IN - input frequency measured with 1 Hz accuracy
F-OUT - output frequency measured with 1 Hz accuracy
3. Selecting the mode of operation and as consequence clock reference for output signal
The SRC can work in two main modes:
•
•
ASNC – asynchronous operation – the output clock is either internal crystal or external
wordclock with no timing relation to input clock. In this mode input clock timing jitter is
completely ignored and replaced by low jitter generator or external clock. This mode is
recommended for applications when jitter reduction is desirable, such as front end of an DAC
converter.
SNC – synchronous operation – the output clock is derived from input clock. This mode is
recommended for straight D-D transfers especially for long audio program (30 min +) when exact
(within 1 output sample) lenght of program has to be maintained. The same (maitaining of lenght)
can also be achieved in ASNC-WCK mode (see below) if external wordclock is locked to
incoming clock. If output clock has problems with achieving lock in synchronous mode, it is
becuase the input signal/clock is noisy and jittery. In such cases ASYNC mode should be used to
provide robust output timing.
Button MODE has three options:
•
•
•
SNC – output clock is derived from input clock (any in FS and any out FS is possible).
ASNC-XTL – output clock is generated by ultra stable 10ps generator.
ASNC-WCK – output clock is the same as supplied wordclock input.
In normal operation MODE led is lit solid. Blinking means the lack of selected clock reference.
4. Output wordlenght selection
OUTPUT WORD LENGTH button allows for output word reduction. Typically output should be set
for 24 bit, but in case of for example direct transfer to CDR, 16 bit would be the proper selection. A flat
TPDF is applied when word reduction is performed.
•
•
•
16
20
24
5. Setting the value of output frequency
The two buttons used for this are SEL i UP.
There are three possible modes of using these buttons:
A) fast – selection of one of several most popular rates.
B) Selection of predefined frequencies
C) typing in any desired output frequency
Entering output frequency setup temporarily blocks other settings. The block is released after setup is
enetred.
A) Fast selection
By toggling UP button following output frequencies can be selected:
•
•
•
•
•
•
•
44100 Hz
48000 Hz
88200 Hz
96000 Hz
176400 Hz
192000 Hz
the last frequency manually entered by user
B) Selection of predefined frequencies.
To enter this mode press SEL. The display will now show flashing name of the subgtoup of
frequencies. Pressing UP .will toggle btwn available subgroups which are:
•
STANDARD
•
PULL DOWN
•
PULL UP
To confirm selection of subroup quickly press SEL. The flashing display will now show one of
the frequencies in the subgroup. Pressing UP button will toggle between frequencies available in
the selected group. Following frequencies are available in each group:
•
STD
•
•
•
•
•
•
44100 Hz
48000 Hz
88200 Hz
96000 Hz
176400 Hz
192000 Hz
•
PULL DOWN
•
42336 Hz
•
44056 Hz
•
46080 Hz
•
47952 Hz
•
PULL UP
•
44144 Hz
•
45937 Hz
•
48048 Hz
•
50000 Hz
Pressing SEL. Confirms final frequency selection. You are done.
C) Manually entering arbirtarly defined frequency:
•
•
•
•
This mode is accessed by pressing and holding for 1 sec the SEL button. After the
mode is enetered a single digital will flash. The flashing digita is the one being
adjusted.
Button UP. Toggles between digital values.
Button SEL confirms value selection.
Repeat the same for all digits. After the confirming the value of the most significant
digit the unit enters operation. You are done.
If entered frequency is less than 32000 Hz the unit will deafult to 32000 Hz. If entered
frequency is more than 192000 Hz the unit will deafult to 192000 Hz.
After entering operation the unit may need few seconds to lock to selected frequency before the
output frequency display stabilizes.
Errors:
The following errors can be displayed:
•
NO IN – no input signal present at selected input
•
NO OUT – no output signal produced because of missing output clock reference
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