[Technical Article] Anatomy of debugging parameters for gain sharing automatic mixer

[Technical Article] Anatomy of debugging parameters for gain sharing automatic mixer

In the previous section we talked about the debugging parameters and debugging methods of the threshold automixer. In this section we will explain the debugging parameters of the gain sharing automixer and the effect of these parameters on the sound. The next section will explain the actual "Automix + Mix minus" to improve the system sound gain.

Gain sharing automixer

The principle of gain sharing automixer is based on expander development. The function of the expander itself is to attenuate the level less than the threshold according to the expansion ratio. Because the sound gain of the room is a fixed value, only the microphone that is currently speaking can obtain the maximum gain level. The audio system can only obtain the speech microphone when multiple microphones are turned on. Gain, the method is to add a noise gate or expander to each microphone input. Of course, if the noise gate is added, it is a threshold automixer, and the expander becomes a gain sharing automixer. The ability of the microphone that does not talk to gain the sound gain is limited by the threshold and ratio of the expander.

Gain sharing automixer debug parameters and effects:

Auto: This button press allows the corresponding channel to enter the automatic mixing algorithm. Bounce means that the automatic mixing algorithm is not passed.
Priority: Priority. The larger the value, the more gain capability is obtained. The higher the priority, the lower the priority of the channel to obtain the sound gain.
HighestGain: The channel indication that is currently speaking. The indicator light is on to indicate that the calcium channel has the highest sound gain.
Gain: Gain, the overall output gain of the automixer.
Response: The time when all the sound gains are obtained when one microphone speaks or the time when the microphone sound gain of other non-speaking microphones is attenuated. The longer the setup time, the longer the time it takes for the speaking microphone to acquire the full sound gain process, and the longer the time that other non-speaking microphones attenuate the sound gain. The shorter the setting, the opposite.
Slope: Slope, similar to the expansion ratio of the expander. The larger the slope value, the more the sound gain obtained by the speaking microphone. The more the microphone does not attenuate the sound gain, the smaller the slope value is. The more the microphone gains the sound gain. Less, the other non-speaking microphones are less attenuated. Common settings are values ​​near 2 or 2. If the user chooses an interface microphone, it is recommended to set the slope to be larger.

↓ Summary ↓
Gain-sharing automixers are simpler to use than threshold automixers in most cases, and their sound effects are smoother and more natural, with the ultimate goal of maximizing the room's sound gain. In order to obtain a larger output level before the howling threshold, the next section will specifically explain the improvement of the sound gain by the two techniques of the automatic mixer and Mix-Minus.

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