Page 1
Meridian 568 Diagnostic Displays.
V1.0 JMB, 13/7/99.
Normally the 568 has the following display options;-
Blank
Trifield 65
Trifield -22
CD 65
PCM 44k
In addition there are options for Multiroom source displays and diagnostics. To switch
diagnostic displays on or off, hold down the STORE button (in standby) until the unit responds
by displaying ‘Diag. On’. Once activated there are four additional displays available when
pressing the DISPLAY button, these are;-
FIFO diagnostics
DSP diagnostics
SETUP diagnostics
SOURCE diagnostics
FIFO diagnostic displays
The numbers shown represent various important parameters used by the data locking device.
The most useful for diagnostic purposes are the highlighted characters.
99 NFD08
This character will be F or X .
F means that the 568 is reclocking
the input data in order to eliminate jitter.
X means that the 568 is not reclocking.
This is either because the source has a
poor clock or the sampling frequency is
32kHz.
If a digital source frequently causes a glitch during playback then it is worth checking this
display. The four figure number may be varying over a wide range while that source is
selected, meaning that at some time F will switch to X. It is possible to pre-empt this by
configuring the 568 to switch to X whenever that source is selected. To do this go to the
advanced section of the sources menu and tick the box ‘poor digital audio source’ . The 568
will no longer try to reclock that source.
0212
These four figures show how
much of the input buffer is being
used. It continually changes in
value as the 568 reclocks the input
signal. If the numbers reach zero
or become very large then F will
change to X. This may happen
during playback and will result in
an audible glitch.
Page 2
DSP diagnostic displays
This set of figures show how the DSP controller is interpreting the incoming data stream.
VEAC 1
Data from the device which reads
information about the data stream. This is
represented with four characters.
1) V indicates that the data is invalid, due
to a disc reading error (e.g. a scratched
CD) or an unlocked input (no input).
Some DVD players will set this for
AC-3.
2) E indicates that the data has been
recorded with pre-emphasis.
3) A or D indicates if the incoming stream
is marked as audio or data.
PCM is always audio
AC-3 is always data
MPEG is always data
DTS is normally marked audio
4) C or P indicates consumer or
professional. These are compatible with
each other in the 568 so will not cause
problems.
00
EE6
0
Sampling frequency
3 = 96kHz
4 = 88.2kHz
5 = 48kHz
6 = 44kHz
7 = 32kHz
E = MHR output, n otherwise
E = MHR input, n otherwise
State
1 = PCM
2 = 96k PCM
3 = DTS
4 = DTS 2-channel
5 = MLP
6 = MLP 2-channel
7 = AC-3
8 = AC-3 2-channel
9 = MPEG
10 = MPEG 2-channel
Setup diagnostic displays
These figures are an encoded description of the speaker setup and layout. They are
duplicated from the ‘advanced’ speaker layout section of the Meridian.exe configuration
program. All letters correspond directly to those of the 565 layouts.
GGG.O MMLMLM
Music Layout
The speaker layout stored for playing
back music.
Theatre layout
The speaker layout stored for non 5.1
encoded television/video soundtracks
5.1 Layout
Three characters show layout stored for
AC-3, DTS and MPEG encoded
soundtracks. The first character is speaker
layout as above. The second two apply to
layouts G,K&L ;.0 = no LFE sub
.1 = LFE sub
In other layouts these two characters are
blank.
Speaker status
Rears - first character is size,
S = small
L = large
Blank = none
- second character is type,
M = Meridian
D = digital
A = analogue
Sides - size and type
Centre - type
Mains - type
Page 3
Source diagnostics
This display shows the setups specific to the currently selected source.
D1/FF/Da/v
Input source
A1,A2,O1,LV
or D1 - D4
Reclocking status
The first character is X if the source
is defined as a ‘poor digital audio source’,
it is F otherwise. For comparison the
second character shows the current FIFO
status, F if it is reclocking, or X if it has
switched to the input as clock source.
C
Validity valid flag, “ v “ is clear,
“V” is set.
DTS characteristics
First character is D if DTS delay is
selected, otherwise “ i ”.
Second character is F if DTS is forced,
otherwise “ a “.
Loading...