Vcom Meaning Radio

[Yoana Terrano]

Client Identification Client Type: Specifies the type of Client that allows the system to modify the internaloperational behavior for proper operation of specific, such as VCOM Control Panels,Device Interfaces, Two-Way radios, and SIP devices.

Client Description: The description given to identify the client that is used exclusively inthe System Administration application. This allows a complete description of a user(typically first and last name) that cannot otherwise be assigned to the selectors due tospace restrictions.

Use Domain Authentication (LDAP): This is used when a Client is outside the LAN, andyour LAN uses authentication to provide secure connections to remote users. If thisoption is enabled VCOM queries the OS to retrieve the already authenticated Windowsuser name. It then uses that name along with an encrypted password unique to thatclient to log in to the VVM. The VCOM Login Password becomes obsolete because theVCOM Control Panel will only permit login if that Windows User Name has beensuccessfully authenticated. The Use Domain Authentication option must also bechecked on the Control Panel. VCOM does not communicate with the DomainController.

Latch Disable Talk Selector: Select to operate associated selector as a momentary,meaning that an audio path will only persist as long as the selector is clicked and held.Party Line Operation: This specifies that a given client operates like a Party Line. Thismeans that anyone talking to that client will also talk to anyone listening to that clientand anyone listening to that client will also hear everyone talking to that client.

IFB Destination: Designates a client as an IFB Destination that causes the system tointerrupt any assigned listen or program feeds to the destination when a Control Panelinitiates a talk path to the destination. This setting is typically used with on-air talentwho need to be constantly monitoring the on-air program feed but periodically take cuesfrom the director or producer.

ISO Destination: Designates a client as an ISO Destination that causes the system tointerrupt any assigned listen or program feeds to the destination when a Control Panelinitiates a talk path to the destination and automatically activates a return talk pathfrom the destination back to the Control Panel. Additionally, the talk paths in bothdirections are isolated so that the conversation is kept private. This setting is typicallyused with cameras when the director or producer needs to isolate a particular camerafrom the camera PL to provide private instruction.

Selector Assignment Restrictions No local Assignment By Administrator: This prohibits local assignments to bemade by an Administrator. Assignments can only be done through the SystemAdministration application

Hot Key: Assigns a keyboard key to the selected Selector so that the key can beused to activate and deactivate the Selector on a VCOM Control Panel. This option is only supported on the VCOM Control Panel for Windows.

Audio Quality Audio Encoder/Decoder: This setting allows selection of a differentencoder/decoder. For VCOM Control Panels and VCOM Device Interface clients thechoice is between a High Compression / Low Bitrate Codec used for Internetconnectivity and a Low Compression / High Bitrate codec that may be used for LocalNetwork connectivity to slightly reduce latency. For SIP Devices the codec specified ispreferential codec used when negotiating which codec to use with the SIP Device.

Audio Encode Sample Rate: This setting controls the sampling rate supported by theClients and thereby dictates default fidelity for the Client connections. This setting istypically the same as the System Audio Sampling rate however it can be specified atlower rate but never at a higher rate (refer to System Audio Sampling Rate for additionaldetail). Higher audio sampling rates have more significant requirements in computational speed and network bandwidth. Careful consideration must be givenwhen choosing this setting with respect to client hardware and the client networkconnection.

Audio Encode Quality: The VCOM System codec achieves compression at the expenseof fidelity of the input speech signal. Unlike some other speech codecs, it is possible tocontrol the tradeoff made between quality and bit-rate.Audio Encode Complexity: With the VCOM System codec, it is possible to vary thecomplexity allowed for the encoder. This is done by controlling how the search isperformed with an integer ranging from 1 to 10. For normal use, the noise level atcomplexity 1 is between 1 and 2 dB higher than at complexity 10, but the CPUrequirements for complexity 10 is about 5 times higher than for complexity 1. Inpractice, the best trade-off is between complexity 2 and 4, though higher settings areoften useful when encoding non-speech sounds.

Packet Re-sequencer Depth: This setting specifies the number of packets that arestored when waiting for an out of sequence audio packet. In some network topologies,even if UDP packets are sent in sequential order, they are received non-sequentially.These packets must be re-sequenced before use. After the maximum re-sequencerdepth has been reached, the packet being awaited is declared to be lost and the re-sequencing is re-started at the next earliest received packet. Valid settings are from 2 to10 packets.

Audio Processing

Automatic Gain Control (AGC): This setting enables or disables AGC on the audio pathfrom Client to the Server. AGC automatically increases or decreases the audio levelsuch that the client presents a uniform audio level to the Virtual Matrix. AGC is primarilyappropriate for use with a Control Panel when used with a headset microphone. Insome situations where there is a high amount of background noise or some returnaudio leakage the AGC may incorrectly amplify the noise to normal audio levels.

Automatic Gain Control (AGC) Level: This setting increases or decreases the sensitivityof the AGC. Increasing or decreasing the sensitivity of the ACG changes the behavior ofthe AGC such that it adapts faster or slower, respectively, to audio levels not consideredto be at uniform level. Decreasing the sensitivity may be useful in cases where there is ahigh amount of background noise or some return audio leakage.

Echo Cancellation Tail Length: This setting controls the duration the echo cancellerwaits to receive the echo before it begins the cancellation process. The recommendedtail length is approximately a third of the room reverberation time. For example, in asmall room, reverberation time is in the order of 300ms, so a tail length of 100ms isrecommended.

Hide Disabled Selectors: This setting hides selectors assigned to other clients that arenot logged into the system. When the clients come online, their selector will dynamicallyappear.

Voice Activity Indication: This setting is used to visually indicate voice activity onControl Panel selectors, represented by selector text and background color switchingbetween base state (yellow text / navy background) and default activity indicationcolors (white text / light navy background) or selected activity indication colors(variable). Voice Activity Indication is only available if the Control Panel has the ability tolisten to or is being talked to by the client indicating voice activity.Split Selector Center Zone: This setting allows the center of the selector to be used toactivate both the talk and listen selectors for split talk/listen selectors.

Control Panel/Device Interface Options Voice Activity Detection Time in Ms: This allows the amount of time to be set for VoiceActivity Detection to turn on for the selected user.

Send SDP With Invite Request: This setting changes the default behavior of callsinitiated by the Virtual Matrix to allow compatibility with devices that do notconform to proper SIP implementation, specifically the Raytheon ARA-1.Normally when the Virtual Matrix initiates a call to the SIP client, it does sowithout sending a Session Description Protocol (SDP), so that it cansubsequently control the codec selection.

Use SDP for RTP Destination: This setting changes the default behavior of theVirtual Matrix to allow strict conformance with the Real-Time Protocolspecification. Normally the Virtual Matrix ignores the RTP IP address specified inthe SDP and uses the actually received RTP IP address as the SIP specificationas written and does not account for SIP clients behind NAT firewalls thattypically alter the IP address of the packet.

Use RTP Packets for Voice Activity Detection: Many SIP device employ SilenceSuppression to eliminate unnecessary network traffic. When a device supportssilence suppression, this option can be enabled such that Voice Activity will beindicated whenever RTP audio packets are received. If this option is not enabled,The Virtual Matrix will indicate Voice Activity by analyzing the content of theaudio stream.

RTP Timeout In Seconds: During an active SIP call, there should be a constantand ongoing flow of RTP audio packets or RTP Keep Alive packets between theclient and the server in additional to the SIP control packets. In some cases theRTP audio packets might be blocked even though the SIP control packets arenot. This option specifies the time in seconds to wait for RTP audio packetsbefore assuming there must be a problem with the connection and disconnectingthe call. Setting this value to zero disables the check for an RTP Timeout.

RTP Keep Alive Method: When a SIP device supports silence suppression, it isoften necessary to send RTP keep alive packets when audio is not being sent inorder to ensure that no firewalls or routers in between close the associated portsdue to inactivity. This option specifies the type of RTP Keep Alive Method as notall SIP devices can accept the RTP Keep Alive Methods specified by RFC 6223.

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