Description
Automix algorithm | The unit's automix algorithm has 3 basic functions which assess the amount by which an |
| input signal is to be attenuated and the output signal's output level. The following functions |
| and parameters flow into the automix algorithm: |
| Dynamic level adjustment |
| The master of all input channels is determined on an ongoing basis. This value is used as the |
| reference value. If the input channel level is very close or over the reference value, this |
| channel will be assessed as dominant and will be slightly attenuated. If the input channel level |
| is well below the reference value, this is assessed as ambient noise and be severely |
| attenuated. |
| A channel's output level is calculated using the following formula: |
| Output level = Input level - (Reference value - Input level) |
| This formula ensures that the output level will not become louder if several input channels are |
| active, rather the master assumes the level of a single channel. This reduces the risk of |
| feedback. |
| If a channel is no longer assessed as dominant, this falls at 1 dB/second and all other non- |
| dominant channels increase with the same constant so that the master output level remains |
| constant. The upward adjustment of a channel takes between 3 ms and 5 ms. |
| Best Mic On |
| With two microphones that are positioned close together there is the disadvantage that comb |
| filter effects may arise by cancelling the frequency components. To suppress these unnaturally |
| muffled or hollow signals, only the microphone channel with the highest level is assessed as |
| dominant and switched on. |
| Noise Detect |
| Permanently present interfering signals, whose amplitude are large enough to be assessed as |
| dominant, but whose level and frequency changes are too low, are not assessed as dominant. |
| Interfering signals such as noise from fans and |
| used as activation criteria for microphone channels. |
48 | DMM 12BC |