Here’s a slice of audio insight from our featured Cornerstone article of the week: Automixer Basics. Let’s go over the benefits of using automatic mixers (automixers), some of the issues that can arise when you don’t, and then a peek at an automixer control block diagram for Audia and Nexia products.

3 Key Benefits of Systems with Automixers

  1. Improved Signal to Noise Ratio (SNR) by limiting the Number of Open Microphones (NOM)
  2. Improved gain before feedback by providing gain attenuation with respect to the NOM (i.e. NOM attenuation)
  3. Reduced microphone comb filtering by limiting voice pickup to a single microphone

Typically, automixers should only be used for installations with multiple microphones.

3 Potential Issues in Systems without Automixers

  1. Poor SNR with all microphones picking up ambient noise
  2. Poor gain before feedback with multiple potential feedback loops
  3. The voice signal is picked up by multiple microphones and suffers from multi-path interferences, also called comb-filtering

Automixer Control Block Diagram

This is a basic diagram of an automixer control block in Audia and Nexia. For a detailed description of the audio path, read it step-by-step here.

If you’re thinking of using mix-minus with an automixer system, read my 5 Ways to Correct Bad Mix-Minus post first to avoid some common mistakes.