For example, channel EQ on a soundboard adjusts the sound profile of a single audio source coming into a mixer and accounts for offending frequencies of the sound source, while turning up pleasant frequencies that should be accented. Different EQs optimize different parts of the signal chain, and what they adjust depends on what the EQ is trying to do. This optimization often occurs at multiple points in the signal chain (as we’ve discussed before). EqualizationĮqualization (or “EQ”) is the attenuation (the turning up or down) of different audio frequencies to optimize the sound of the audio signal. These effects include frequency effects, like equalization dynamic effects, such as limiters and gates delay effects, like reverb and delay audio conferencing effects, such as echo cancellation and phasing and other special effects.
There are many different types of audio effects, but most can be grouped into a few general categories, based upon the basic technology behind the effect.
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It can also be found in a dedicated hardware digital signal processor (such as a BSS Soundweb London DSP) or as technology that is built into another device, such as a Crown Amplifier, JBL portable speaker or AMX Enova video switcher. It can be found in a mixer, such as soundboard, where there are adjustments to the individual audio channels on the board, as well as built-in digital rack effects and master channel effects. Because each of these are so different, we will look at each type of processing separately, starting with audio processing.Īudio processing-called Digital Signal Processing (or DSP)-can be found in a variety of places within the signal chain. Finally, lighting processing, an aspect of an LED Video lighting system, breaks a video signal down and maps pixels from the video to individual LED diodes in various LED video fixtures in an installation. Video processing, on the other hand, modifies the video signal to ensure video is as close to the source signal as possible while optimizing for the display. Audio processing accounts for differences in sound and adds a variety of effects and modifications to ensure optimal sound quality. This is because each type of signal requires a unique type of processing. However, at the processing phase, the pathways are separated, with distinct audio, video and lighting processing. However, an effective AVL system also ensures that everything looks and sounds great, which often requires some processing of the audio and video signals in the installation.įor much of the AVL system, the audio, video and lighting signal paths are intermingled, with audio and video coming together and splitting apart, video flowing into LED lighting, and the audio, video and lighting controlled, using an interconnected control platform. Perhaps this is because people typically think of audio and video systems as the technology involved with getting the source to the destination. This is an important step in the process, and the one that is most likely to be overlooked when people think about the AVL system.
Today, we’re moving on to the processing phase.
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