Loudness graph tab

The <Loudness graph> feature is used to display channel volume. Click the <Speaker> icon. At the bottom of the “Settings” pane, select a channel. This opens the media player and populates the bottom of the “Settings” pane with another icon title: <Metrics>. Clicking the <Chevron> icon displays the name of the audio subsystem used to ingest the stream. Hovering over the subsystem displays a <Plus> image icon. Press it to display a list of available graphs. In some cases, the system allows you to display multiple graphs; in other cases, only a single graph.

Figure: Loudness graph

Figure: Loudness graph

In the “Setting” pane, specify the program date and time. You can adjust the date/time by using the <Calendar> feature of the player. If this option is left blank, the player is opened in the mode specified in user preferences in the <Tools> menu. The example shown is live, which is why the loudness graph does not extend all the way to the end. The <History> dropdown sets the maximum duration of the graph.

Figure: Loudness detail

Figure: Loudness detail

Positioning the cursor in the graph lets you zoom in on an area of interest and display the instantaneous loudness level. To examine the graph in more detail, slide the bars at either end of the lower graph image to expand the upper graph. Once the graph is expanded, use the left and right arrow keys of the lower graph to step through the entire range.

The graphs are color-coded. Hovering over the graph identifies each color and the instantaneous value at the cursor position.

Graphing options

M measurement

Momentary sliding rectangular (.4s) integrated window; sampling every 100 milliseconds, calculating its average every 400 milliseconds; values not configurable

S measurement

Short-term sliding rectangular (3s) integration window; sampling every 100 milliseconds, calculating the average every three seconds; values not configurable

SI measurement

Short Integrated measurement; sampling every 100 milliseconds; Volicon Media Intelligence service calculates average every X seconds within, up to six defined durations (usually left at default value of 10 seconds)


Binary true/false indication of speech


Speech audio level


Graph minimum loudness level


Graph average loudness level


Graph maximum loudness level


Shades the area between min and max graph