Glossary
The following defines some of the terms used in the Compass Control Software GALAXY processor User Interface.
AAF | AVTP (Audio Video Transport Protocol) Audio Format |
AVB listener | A device that is capable of receiving AVB streams from an AVB talker. All available streams from all available AVB talkers that have the same group name on the network will selectable by the AVB Listener as inputs. |
AVB stream | An AVB stream functions much like an analog multi-cable. Each stream can vary in the number of channels and formats, similar to AES3 and standard analog multi-cables. The difference is that many audio streams can flow down a single Ethernet cable. Unlike traditional multi-cables, AVB streams do not stay connected when the audio devices are turned off. An AVB software controller creates and maintains these connections running on a computer attached to the network or inside one of the audio devices being controlled. An AVB controller in the audio device will maintain persistent connections and remake connections after power cycle or other interruptions, such as the unplugging of an Ethernet link. |
AVB talker | A device that is an AVB source capable of transmitting AVB streams. This device will send AVB streams to an AVB listener. When an AVB talker is on the network, it advertises its presence and the streams it is able to transmit. |
| The channel name is used to identify a specific channel within an AVB stream. |
CRF | Clock Reference Format |
Cross-point | A point in the summing/delay matrix where the routing between inputs and outputs is assigned. |
Device settings | Current state of all control points (gain, EQ, delay, routing, etc.) of a GLAXY processor. |
Entity name | The entity name is used to uniquely identify an AVB entity. All entities must be unique within a group. |
Global environment | Environmental settings (temperature, humidity and altitude) for all linked devices. |
Global project | File saved to a computer that includes all of the Projects from the selected processors and the current device settings for each processor. |
Global snapshot | A snapshot, capturing all of the current device settings, which is stored in each processor, with the same name. |
Group name | Associates multiple AVB devices connected to the same network. The group name must be identical for an AVB talker (source) and AVB listener (sink) to establish AVB connections. |
Media status | Media status indicates whether the listener AVB stream is locked to the media clock rate of the AVB talker. |
MSRP | Multi-Stream Reservation Protocol |
MSRP accumulated latency | The worst case amount of time it will take a signal to pass from the AVB talker to the AVB listener. This value is calculated when the stream reservation value is propagated from the AVB talker to the AVB listener. |
Presentation time | A timestamp an AVB talker sends, set in the future with respect to the master clock time, for when the signal is to be ‘presented’ at the output of the AVB listener. This approach ensures that signals are reproduced simultaneously at different AVB listeners regardless of the varying path lengths a signal may have to traverse. |
Project | A file saved to a computer that includes all of the Snapshots stored in the GALAXY processor and the current device settings. |
Selected device | Devices that are designated to be globally linked by clicking SELECT in the Link column of the Compass > Inventory tab. The ID selection from the adjacent column allows for multiple global link groups of processors. There are three modes for global linking, selectable on the GALAXY Preferences > Global Linking tab. |
SIM | Source Independent Measurement |
Sink | An AVB listener has a least one sink, a virtual input. Each sink can receive one AVB stream. |
Snapshot | A snapshot contains all of the control point values captured, named, and stored in the GALAXY processor hardware. When snapshots are recalled, all of the control point values of GALAXY processor are overwritten with the stored values, with the possibility to exclude some parameters via the confirmation dialog. Snapshots are listed in the Snapshot Library on the Project tab and are limited to a maximum of 255. Click on the snapshot name to select, then click the desired function button on the right of library list. |
Source | An AVB talker has at least one source, a virtual output. Each source makes one AVB stream available on the network. |
Stream format | The combination of samples per frame, channels per frame, sample rate, and bit depth of a data stream, which is specified in the IEEE 1722-2016 Standard, Transport Protocol for Time-Sensitive Applications in Bridged Local Area Networks. |
Stream name | Identifies a specific AVB stream created by an AVB source. |
