Dolby Laboratories DM100 User manual

DM100 User’s Manual
i
Dolby Laboratories, Inc.
Corporate Headquarters
Dolby Laboratories, Inc.
100 Potrero Avenue
San Francisco, CA 94103-4813
Telephone [phone]
Facsimile 415-863-1373
www.dolby.com
European Headquarters
Dolby Laboratories
Wootton Bassett
Wiltshire, SN4 8QJ, England
Telephone [phone]
Facsimile (44) 1793-842101
DISCLAIMER OF WARRANTIES: Equipment manufactured by Dolby Laboratories is
warranted against defects in materials and workmanship for a period of one year from the date
of purchase. All warranties, conditions, or other terms implied by statute are excluded to the
fullest extent allowed by law.
LIMITATION OF LIABILITY: It is understood and agreed that Dolby Laboratories’
liability whether in contract, in tort, under any warranty, in negligence or otherwise shall not
exceed the cost of repair or replacement of the defective components and under no
circumstances shall Dolby Laboratories be liable for incidental, special, direct, indirect, or
consequential damages (including but not limited to damage to software or recorded audio or
visual material), or loss of use, revenue, or profit even if Dolby Laboratories or its agents have
been advised, orally or in writing, of the possibility of such damages.
Dolby, the double-D symbol, AC-3, and Surround EX are trademarks of Dolby Laboratories. Toslink
is a trademark of Toshiba Corporation. Windows is a trademark of Microsoft Corporation.
2000 Dolby Laboratories Inc; all rights reserved. Issue 1
Part No. 91751
S00/13416

DM100 User’s Manual
ii
Table of Contents
Note: References to the front-panel buttons are shown using brackets
throughout this manual (e.g., “[STATUS]”). References to multiple button
combinations means sequences, not simultaneous button presses. Press the
first button, release, and press the next button.
Chapter 1 Introduction
1.1 About the DM100..................................................... 1-1
Chapter 2 Getting Started
2.1 Power........................................................................ 2-1
Battery Installation........................................ 2-1
[Power] Button.............................................. 2-2
Battery Low LED.......................................... 2-2
Auto-Power Off ............................................ 2-2
External DC Power Supply........................... 2-3
2.2 Rear Belt Clip/Stand................................................. 2-3
2.3 Inputs........................................................................ 2-4
Dolby Digital ................................................ 2-4
Dolby E......................................................... 2-4
PCM.............................................................. 2-4
Other ............................................................. 2-4
Video............................................................. 2-4
2.4 Outputs..................................................................... 2-5
Headphone Output........................................ 2-5
Speaker Output ............................................. 2-5
2.5 Hookup..................................................................... 2-6
2.6 Quick Start ............................................................... 2-7
Making Your First Reading.......................... 2-7
Generating a Bitstream ................................. 2-7

DM100 User’s Manual
iii
Chapter 3 Operation: Status Mode
3.1 Main Status Screen...................................................3-1
Dolby E.........................................................3-2
Dolby Digital ................................................3-3
PCM..............................................................3-4
3.2 The Status Menus..................................................... 3-5
3.2.1 Dolby E Metadata Input Menu......................3-6
Px Prog Desc.................................................3-7
Px Dialogue Lev............................................3-7
Px Channel Mode.......................................... 3-8
Px LFE Channel............................................3-8
Px Bitstrm Mode...........................................3-8
Px Line Mode Pro......................................... 3-9
Px RF Mode Pro............................................ 3-9
Px RF Ov Protect .......................................... 3-9
Px Center Dwnmx.........................................3-10
Px Srnd Dwnmx............................................ 3-10
Px Dolby Srnd...............................................3-10
Px Mixing Level............................................3-11
Px Room Type ..............................................3-11
Px Copyright .................................................3-11
Px Orig Bitstrm.............................................3-11
Px Extnd Bitstrm........................................... 3-12
Px DC Filter..................................................3-13
Px Lowpass Filt.............................................3-13
Px LFE Filter................................................. 3-13
Px Srnd 3dB Attn..........................................3-13
Px Srnd Ph Shift............................................3-13
Px Begin Gain............................................... 3-13
Px End Gain..................................................3-13

DM100 User’s Manual
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3.2.2 Dolby Digital Metadata Input Menu............. 3-14
DD Dialogue Lev.......................................... 3-15
DD Channel Mode........................................ 3-15
DD LFE Channel.......................................... 3-15
DD Data Rate................................................ 3-16
DD Bitstrm Mode ......................................... 3-16
DD Line Mode Pro ....................................... 3-17
DD RF Mode Pro.......................................... 3-17
DD Center Dwnmx....................................... 3-17
DD Srnd Dwnmx.......................................... 3-18
DD Dolby Srnd............................................. 3-18
DD Mixing Level.......................................... 3-18
DD Room Type............................................. 3-19
DD Copyright ............................................... 3-19
DD Orig Bitstrm ........................................... 3-19
DD Extnd Bitstrm......................................... 3-20
DD Dual Mono MD...................................... 3-21
DD Format.................................................... 3-22
DD Sample Rate ........................................... 3-22
DD Bitstream ID........................................... 3-22
DD Stream # ................................................. 3-23
3.2.3 AES3 Status Menu........................................ 3-24
3.2.4 Input Level Menu.......................................... 3-25
3.2.5 Generator Status Display .............................. 3-26
3.2.6 Video Reference Status Display................... 3-26
3.2.7 Timecode Status Display .............................. 3-27
3.2.8 Error Statistics Menu .................................... 3-28
3.2.9 DM100 Firmware Version............................ 3-28

DM100 User’s Manual
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Chapter 4 Operation: Setup Mode
The Setup Menus..............................................................4-1
4.1 Monitor Control........................................................4-2
4.2 Gen Control..............................................................4-4
4.3 AES3 Output ............................................................4-6
4.4 User Presets..............................................................4-7
4.5 I/O Control ...............................................................4-8
4.6 System Settings ........................................................4-9
Chapter 5 Reference Information
5.1 Data Transfer............................................................5-1
Test Bitstream Loading................................. 5-1
Data Logging.................................................5-1
Firmware Upgrade ........................................5-2
Data Transfer Error Messages: .....................5-2
5.2 Unit Reset................................................................. 5-3
Restore Default Settings................................5-3
Hardware Reset............................................. 5-3
5.3 Connector Pinout Information.................................. 5-4
RS-232 Serial Port....................................................5-4
5.3.2 XLR Connectors ...........................................5-4
5.3.3 Headphone Connector...................................5-4
5.4 DM100 Specifications..............................................5-5
5.5 System Block Diagram............................................. 5-5

DM100 User’s Manual
1-1
Chapter 1
Introduction
1.1 About the DM100
The Dolby DM100 is a hand-held diagnostic tool that can
monitor or generate Dolby Digital, Dolby E, and PCM
bitstreams. The unit allows audio systems integrators and service
engineers to quickly test the integrity and composition of these
signals throughout a facility. The DM100 is intended for use in
broadcast, cable, DBS, and post-production facilities, as well as
DVD mastering and home theater installation.
The DM100 accepts input signals via XLR, BNC, and Toslink™
connectors. The unit identifies the format of the input signal and
activates the appropriate built-in decoder. The decoded analog
signal, sent to a standard 1/8-inch stereo headphone jack, can be
switched to monitor any two decoded channels, while a small
built-in speaker can monitor the sum of any channel pair. A
front-panel LCD displays Dolby Digital and Dolby E metadata
information. Six front-panel LEDs indicate critical bitstream and
system status information.
A set of Dolby Digital, Dolby E, and PCM test bitstreams is
stored in internal, nonvolatile RAM, and can be changed in the
field via software download. The selected test bitstream is
produced simultaneously on all output connectors. The unit can
receive and decode an input signal while generating a test
bitstream. The DM100 also features a pass-through mode that
allows modification of the input signal’s AES channel status bits
before passing the signal to the output connectors. (The input
signal can be monitored simultaneously.)

DM100 User’s Manual
2-1
Chapter 2
Getting Started
2.1 Power
The DM100 is powered by four standard AA 1.5 V batteries or
from an external 6V, 800 mA DC power supply via the power
input connector. The internal batteries are disconnected when
the external DC power supply is used.
Battery Installation
Push the cover as
shown, and slide
out.
Insert four AA
batteries with
alternating positive
terminals, and
replace the cover.

DM100 User’s Manual Getting Started
2-2
Dead Battery…
[Power] Button
To turn on the DM100, press and hold the [Power] button down
for two seconds. The display reads as shown for approximately
one second while a self-test diagnostic runs.
The power-on process ends with the DM100 operating in the
last-used state. If the diagnostic test fails, the Error LED lights
and an error message is displayed.
To turn off the DM100, press [Power] again. The display reads
“Power Off,”and the unit shuts off.
Battery Low LED
The front-panel battery LED flashes when the
battery voltage drops below 4.3 V. If the
battery voltage drops below 4.1 V, the
DM100 display reads “Dead Battery”and the
unit shuts off.
Auto-Power Off
When the DM100 is powered from the batteries (external power
supply not connected), the unit can be set to turn itself off after a
selectable number of minutes with no user activity (5, 10, 15, or
30 minutes). This feature can be disabled. The factory default
setting is 15 minutes.
The wait time is set from the Setup menu under System Settings,
Power Management. See section 4.6.
Model DM100
Unit Name
Power Off…

DM100 User’s Manual Getting Started
2-3
External DC Power Supply
When powered from the external power supply, the Power
Management setting is ignored and the unit remains switched on.
The LCD backlight and keypad backlights are also enabled,
overriding the LCD Backlight setting. See section 4.6.
2.2 Rear Belt Clip/Stand
The pull-out clip on the rear of the DM100 can be used as a
handy belt clip, or a stand. Raise the clip by following these two
steps:
1. Lift to Release
2. Pull
2
1
2
1
1LIFT TO UNLATCHLIFT TO UNLATCH
2PULL OUTPULL OUT

DM100 User’s Manual Getting Started
2-4
2.3 Inputs
Each input connector (XLR, BNC, or Toslink) is active when
specifically selected, or, if the input selection is set to autodetect,
the first input with a valid AES3 signal will become the active
input. See section 4.5 for setting the input select function. See
the specifications at the back of this manual for details on
supported sample rates, impedances, etc.
The Digital input format can be Dolby Digital, Dolby E, or
PCM.
Dolby Digital
The DM100 accepts 16- and 32-bit Dolby Digital bitstreams. It
also accepts AES3 data that contains multiple Dolby Digital
bitstreams (i.e., one 16-bit mode bitstream in each AES3
channel).
Dolby E
The DM100 accepts 16-, 20-, and 24-bit Dolby E bitstreams at
NTSC (27.97 Hz) and PAL (25 Hz) rates.
PCM
If the input signal does not contain a header indicating that a pre-
encoded bitstream is being received, the DM100 assumes the
input signal is PCM audio.
Other
The DM100 also accepts other non-audio data over AES3. In
this case, the LCD will indicate that data is being received and
the audio output will mute.
Video
The unit can use an analog composite NTSC or PAL black burst
reference video signal for signal generation, via the Ref Video
RCA connector. The input is internally terminated.

DM100 User’s Manual Getting Started
2-5
2.4 Outputs
The XLR and BNC output connectors are always active. The
Toslink connector is enabled when it is selected.
The digital output signal can be:
•Pass-through Dolby Digital, Dolby E, or PCM
The output clock is locked to the digital input.
Or
•An internally generated Dolby Digital, Dolby E, or PCM
test bitstream.
The output clock can be locked to an internal 48 kHz clock, a digital
input signal, or to 48 kHz derived from the video reference input. See
section 4.5.
Headphone Output
The headphone output is used to monitor the decoded Dolby
Digital, Dolby E, or PCM signal. Front-panel buttons adjust the
headphone volume.
Speaker Output
The speaker output is used to monitor the decoded Dolby
Digital, Dolby E, or PCM signal when headphones are not being
used. The signal is a mono version of the headphone output.
Front-panel buttons adjust the speaker volume.

DM100 User’s Manual Getting Started
2-6
2.5 Hookup
The figure shows the locations for connecting components to the
DM100.
Power Adapter
Part Numbers: 54065 USA
54066 UK
54067 Europe
54068 Australia
RCA F to BNC M
Part Number 70218
Ref Video In
BNC F to RCA M
Part Number 70217
Toslink Cable

DM100 User’s Manual Getting Started
2-7
2.6 Quick Start
The DM100 is designed to be quick and intuitive to use. Follow
these simple procedures to begin taking your first readings and
generating your first test streams.
Making Your First Reading
1. Power up the unit.
2. Connect the input signal to the appropriate connector.
3. Press [MON]. This resets all the internal monitoring setup
functions to the defaults.
The LEDs should display the signal type received, and the
display will show information about the incoming signal. If you
cannot see this information, press [STATUS], then use
[ENTER], [ESC], and the [Up/Down] buttons to navigate
through the status menus in order to view information about the
incoming signal. See section 3.2.
Adjust the audio level with the dedicated [Volume] buttons.
Generating a Bitstream
1. Press [GEN] once. This will turn the generator on and output
a PCM test signal.
2. To select other test streams, continue to press [GEN].
Different clock sources can be used for the generator; these can
be set in the I/O Control Gen Clock Source setup menu. See
section 4.5.
To read the current status of the generator, press [STATUS] and
navigate using the [Down] button until “Generator ENTER to
View”is displayed. Press [ENTER] to see the current settings.
See section 3.2.5.
You can even connect the output of the DM100 to the input. By
doing this you can listen to the test stream and view all of the
streams’settings.

DM100 User’s Manual
3-1
Chapter 3
Operation: Status Mode
After power-on, the DM100 defaults to Status mode, with the
top-level main status screen displayed. Status mode is used for
displaying, monitoring, and analyzing the input bitstream.
3.1 Main Status Screen
The main status screen is the top level of the status menu tree. It
displays one of the following possible combinations of
information. The display shown below gives a typical example:
The following sections describe the information displayed on the
second line for each type of input data.
Dolby Digital B
3/2L 448kbps
Active Input Connector
ASet to Autodetect
BSet to BNC
XSet to XLR
OSet to Optical
Valid Dolby E bitstream Dolby E
Valid 32-bit Dolby Digital
bitstream Dolby Digital
Valid 16-bit Dolby Digital
packed in left channel DD/PCM
Valid 16-bit Dolby Digital
packed in right channel PCM/DD
Two valid Dolby Digital
bitstreams DD/DD
Valid PCM bitstream PCM
No incoming bitstream No Input

DM100 User’s Manual Operation: Status Mode
3-2
Dolby E
When the incoming bitstream is Dolby E, the following
information will be displayed:
Dolby E B
5.1+2 24bit
16bit Bit Depth
20bit
24bit
Program Configuration 5.1+2
5.1+2x1
4+4
4+2x2
4+2+2x1
4+4x1
4x2
3x2+2x1
2x2+4x1
2+6x1
8x1
5.1
4+2
4+2x1
3x2
2x2+2x1
2+4x1
6x1
4
2+2
2+2x1
4x1
Invalid Dolby E program
configuration *******

DM100 User’s Manual Operation: Status Mode
3-3
Dolby Digital
When the incoming bitstream is Dolby Digital, the following
information will be displayed:
56kbps
64kbps
80kbps
96kbps
112kbps
128kbps
160kbps
192kbps
224kbps
256kbps
320kbps
384kbps
448kbps
512kbps
576kbps
640kbps
“L”means the LFE-
enabled bit is set in the
bitstream
Dolby Digital B
3/2L 448kbps
1+1
1/0
2/0
3/0
2/1
3/1
2/2
3/2
3/0L
2/1L
3/1L
2/2L
3/2L

DM100 User’s Manual Operation: Status Mode
3-4
PCM
When the incoming bitstream is PCM, and the DM100 has
locked to it, the following information will be displayed:
PCM B
44.1 kHz
48 kHz
44.1 kHz
32 kHz
Unknown Rate