Transcript Marketing Presentation

Networked Audio
Using V+ and
VComm
SimPhonics, Inc.
Overview
What is VComm?
Networked audio component of V+
Uses DIS, HLA, and VoIP protocols
Connects simulators via network
Simulate radios over network
Provide Intercoms, Radio simulation, etc.
Interoperate with ASTi and others
SimPhonics, Inc.
Overview
Can be used with any Windows XP
Need sound and network device (card)
Works on laptops, desktops, etc.
Unlimited number of radios and operation
Not credit based
Add-on to V+
Sold separately
SimPhonics, Inc.
Overview
VComm is networked audio
For local audio use SMx or other means
VComm could be used for local communications
Inefficient since it uses network sockets
VComm and SMx can be used together
SMx uses virtual WI and WO, well suited for VComm
SimPhonics, Inc.
DIS/HLA Primer
SimPhonics, Inc.
DIS/HLA Primer
DIS
– Distributed Interactive Simulation
HLA
– High Level Architecture
SimPhonics, Inc.
DIS/HLA Primer
DIS in wide use
– Military exercises
Virtual flag
– Several hundred participants
– SimPhonics systems play prominent role
– Interoperable with ASTi, Plexus and emDee
SimPhonics, Inc.
DIS/HLA Primer
DIS
– IEEE 1278.1a standard
Distributed network for simulation interoperability
DIS in wide use
HLA less prominent but newer
SimPhonics, Inc.
DIS/HLA Primer
DIS versions
– IEEE 1278.1-1995
First IEEE Standard
– IEEE 1278.1a-1998
Second IEEE Standard
– 1278.1a-200x (Draft 13)
Under development
SimPhonics leading Radio Tiger Team Effort
SISO PDG
SimPhonics, Inc.
DIS/HLA Primer
DIS versions
– IEEE 1278.1a-1998
Latest IEEE Standard
Added Intercom PDUs (ICS)
ICS PDUs are not being used
– 1278.1a-200x
Improving plug and play capability for radios
Encourage vendors to interoperate
Fix bad sections in standard
SimPhonics, Inc.
DIS/HLA Primer
DIS protocol based on UDP/IP
– All Communication is via PDUs
A PDU is an Ethernet packet
PDU Families
Entity Information/Interaction
Warfare
Logistics
Simulation Management
Emission Regeneration
Radio Communications
Entity Management
Minefield
Synthetic Environment
Simulation Management with Reliability
Information Eperations
Live Entity
SimPhonics, Inc.
DIS/HLA Primer
Relevant PDUs to VComm
– Entity State
Used only for entity attach (more later…)
This means that all entity PDUs must be inspected if
entity attach is being used
– Radio Communication PDUs
Transmitter
Signal
Receiver
Intercom signal (IEEE 1278.1a 1998 only)
Intercom control (IEEE 1278.1a 1998 only)
SimPhonics, Inc.
DIS/HLA Primer
Radio Communication PDUs
Transmitter
– Convey information about a simulated transmitter, on/off,
type, secure equipment, etc.
Signal
– Carries actual digitized audio data (voice)
Receiver
– Conveys information about simulated receivers. This is
not a widely used PDU, although SimPhonics does
implement this PDU (possibly the only vendor).
SimPhonics, Inc.
Transmitter and Signal PDUs
SimPhonics, Inc.
DIS/HLA Primer
HLA
Publish and subscribe mechanism
– Much more efficient
– Single process called RTi handles all interactions
– At one time in the past, all DOD sites were mandated to be
HLA compatible…(did not happen)
Difficult to setup and use
– Low interoperability in industry
FOM
– Federate Object Model
– All applications must use same FOM
– Most popular is RPR FOM 1.0
SimPhonics, Inc.
DIS/HLA Primer
HLA Versions
Original version known as HLA 1.3
– Developed by DMSO – public distribution
– Has since been handed to industry and is no longer avail.
Current IEEE 1516 standard
– HLA 1.3 still Prominent
SimPhonics, Inc.
How to use VComm
with V+
SimPhonics, Inc.
VComm DIS Radios
Define Requirements
Interoperability requirements
Voice Quality
Networking Issues
Configure VComm
Create .VNE file
Build V+ Application
Reuse existing, or create new model
Monitor System
Debug, resolution of problems
SimPhonics, Inc.
Interoperability Issues
Interoperability requirements
If interaction with other vendor radios,
– Determine their needs
Sample Rate
Compression scheme
Signal PDU length
Model Fidelity – frequency match
Otherwise, no worries
SimPhonics, Inc.
Voice Quality
Sample Rate
Best voice quality when:
16,000Hz sample rate
No compression scheme, (PCM)
Longer signal PDU lengths (1048)
Only works when you have this freedom
Not interoperating
Network Bandwidth is available
8000Hz most common
Meets basic DIS requirement
Default VComm setting
SimPhonics, Inc.
Voice Quality
Compression Schemes
1 = mu-law, 2:1
2 = CVSD, 16:1 (MIL STD 188)
3 = ADPCM, 4:1
4 = 16-bit PCM (Big Endian), 1:1
5 = 8-bit Linear PCM, 1:1
6 = VQ, variable comp., (not supported in VComm)
7 = CVSD CCTT, 16:1
8 = 1.625-bit GSM0, variable comp., (currently in devel.)
9 = 0.7-bit GSM0, variable comp., (currently in devel.)
100 = 16-bit PCM (Little Endian), 1:1
Only mu-law required to be compliant with (current)
DIS standard
SimPhonics, Inc.
Voice Quality
Signal PDU length
– Any length will work with VComm, but
No Specification Requirement
VComm and ASTi use 480
– Best to use other vendor’s settings
SimPhonics, Inc.
Network Issues
VComm Network Topology
Broadcast
– Simple to configure, inefficient
Unicast
– Point to Point
Multicast
– Difficult to Configure, efficient, becoming standard
method of DIS networking
SimPhonics, Inc.
Configuration
Network Topology
SimPhonics, Inc.
Configuration
Default port is 3000
SimPhonics, Inc.
Configuration
Specification version should not matter, but, some
exercise filters require certain versions…
SimPhonics, Inc.
Configuration
HLA Setup
SimPhonics, Inc.
Configuration
Terrain Server Setup
SimPhonics, Inc.
Build V+ App
Select existing design
– Explore
C:\Program Files\VPLus\VPLus Samples\VComm
– “VComm Radio.des”
– Should not have to change anything
SimPhonics, Inc.
Build V+ App
Frequency
Push-To-Talk
SimPhonics, Inc.
Build V+ App
Antenna
Location
Exercise ID
SimPhonics, Inc.
DIS IDs
If IDs are left at zero
– VComm generates an ID based on IP address
(e.g., 192.168.100.33 generates an ID of 100/33/1/x
Otherwise, you must specify ID’s
– Difficult configuration management
SimPhonics, Inc.
Setting Compression Scheme
Compression Scheme
SimPhonics, Inc.
Antenna Location
Three ways to set Antenna location
Hard code the X,Y,Z inputs with constants
Connect inputs to another computer (Host)
Attach the radio to an existing network entity
SimPhonics, Inc.
Antenna Location
Entity Attach
Allows VComm to attach to an existing entity
on network
Must know the entity ID
Use Object 2017
SimPhonics, Inc.
DIS/HLA Setup
SimPhonics, Inc.
DIS/HLA Setup
Each VComm radio is independent
Simultaneous use of DIS/HLA
“Send To Network” static data determines
DIS/HLA network selection
Can use both!
“Send To Network” Settings:
0 - off (no packets will be sent)
1 - DIS
8 - HLA
9 - Both DIS and HLA
SimPhonics, Inc.
Network Monitoring –
VComm Monitor
SimPhonics, Inc.
Instrumentation –
Perfmon.exe
SimPhonics, Inc.
Instrumentation (Perfmon.exe)
Performance monitors
Incoming PDUs
Outgoing PDUs
Dropped TX packets
Incoming Transmitter PDUs
Incoming Signal PDUs
Incoming Entity State PDUs
Incoming ICS Control PDUs
Incoming ICS Signal PDUs
Number of Radios in Exercise
SimPhonics, Inc.
Inside VComm
SimPhonics, Inc.
Signal Processing Models
SimPhonics, Inc.
Path Loss Model
Path loss is several models
Free space propagation Loss
WGS84 earth model LOS
Refraction
Terrain surface type
Fresnel effects
Multi-path signal fading
Terrain database
SimPhonics, Inc.
Propagation Loss Model
Signal Pow er at Receiver vs. Distance from Transm itter
Transm itter Pow er = 5 Watts
0.0
-10.0
Signal Power (dB)
-20.0
-30.0
-40.0
30 MHz
Distance (km )
0
100
200
300
60 MHz
400
500
600
90 MHz
120 MHz
150 MHz
180 MHz
210 MHz
-50.0
-60.0
240 MHz
270 MHz
-70.0
300 MHz
-80.0
330 MHz
-90.0
360 MHz
390 MHz
SimPhonics, Inc.
Smooth Earth Model
Line-Of-Sight
WGS84 Earth Model LOS
Diffraction Effects
Terrain
SimPhonics, Inc.
Fresnel Effects Model
Fresnel zone 1
Up to 60 dBm before LOS interference
SimPhonics, Inc.
Tuner Model
Definition (Bandwidth)
SimPhonics, Inc.
Tuner Model
VComm Tuner Model
Uses Gaussian functions
Band pass response if Specific to radio
SimPhonics, Inc.
Noise Model
Radio noise
Thermal noise (KTB Noise)
– Function of Bandwidth
– -131 dBm at 25,000 Hz
Atmospheric noise
– Based on several types of noise
– Includes Galactic and Man-made
– Zero below 100,000 Hz (ICS frequencies)
SimPhonics, Inc.
Noise Model
SimPhonics, Inc.
Audio Filtering
Audio filtering for realism
Real radios band pass the audio
300 to 3,000 Hz
Sounds distinctly like a radio
VComm Radio Audio Emulation Filter
(object 2055) provides this capability
SimPhonics, Inc.
300Hz to 3000Hz Band-pass Filter
Unfiltered DIS Radio
Filtered DIS Radio
(All Competitors)
(Realistic Model)
Click on Icons to Hear
Difference
SimPhonics, Inc.
Other special audible effects
“Squelch tail”
Heard at end of incoming transmission
Function of AGC, S/N level, etc.
Radio power on and power off sounds
Radio specific
Secure effects
System specific effects
Test Tones, etc.
SimPhonics, Inc.
Important Issues to
Remember
SimPhonics, Inc.
Coordinate Systems
SimPhonics, Inc.
Geodetic
Geocentric (DIS)
LAT, LONG, ALT
X,Y,Z
Coordinate Systems
DIS uses Geocentric
Object to convert Geodetic to Geocentric
Note that 0,0,0 Geocentric is the center of the earth
and a de-facto DIS standard for non-propagation
loss radio.
SimPhonics, Inc.
New Style (V8.0) VComm Radios
SimPhonics, Inc.
Old Style VComm Radios
SimPhonics, Inc.
Device versus Channel
Be careful when dealing with legacy radios
Devices are two channels of left and right
Channels are independent streams
Device
Channel
1 Left
1
1 Right
2
2 Left
3
2 Right
4
Etc…
SimPhonics, Inc.
Antenna Location
De-facto standard
x,y,z = 0,0,0 means no propagation loss and is
most widely used
Any other location, and propagation loss model
is in effect
SimPhonics, Inc.