O3A Meter - Signal

Host Support

Audio

Description

This extremely simple plugin measures the signal peak in each of the 16 channels of an O3A stream to indicate if a signal is present. It is intended for basic diagnostics (e.g. "are all my channels getting through?") and not for serious signal analysis. Audio is passed through unchanged.

Meters

Lights are shown for each of the 16 channels in O3A. They are shown in rows corresponding to the ambisonic orders. Lights switch on with a yellow colour in the presence of very low signal levels (-100dB and above) and switch to red at high levels (0dB and above). These signal levels are simple peak levels, not "True Peak".

Note that first order ambisonic B-Format only uses the first four channels of O3A, in which case only the first four lights (top two rows) will be on. Sounds exactly on the horizontal plane switch on alternating lights on each row and a few special directions do other strange things. However, normal 3D streams should switch on all 16 lights; if they do not there is probably something wrong! A common error is to forget to set a track's channel count or send to at least 16, and this plugin will usually make that obvious.

The plugin is available in the O3A Core plugin library.