Noise gate

The gate is an effect unit to category dynamics processors and suppresses quiet sections of the signal transmission.

Design and function

The operation is that signal levels are only passed from an adjustable strength. This is often used to avoid noise, especially in the simultaneous use with expanders. But even with the loss of Drums gates are used. On the one hand, to control their dynamics, and on the other to avoid crosstalk from adjacent sound sources. A side effect of the use of gates is to reduce the risk of feedback.

Often gates are operated in clusters. Such, also called squelch devices are used to steer a signal when it exceeds its noise level (see dynamic range), so a useful signal is present. This is particularly important in multi-channel mixing consoles of importance in which the growing through the many audio tracks output noise should not be too large.

As the compressor, the signal is modulated by an envelope of the gate. The parameters of the envelope are the rise time ( Attack) and the decay (release ). This process is always triggered when the input signal exceeds a threshold value ( threshold), is thus triggered. In professional Gates, the envelope can be determined by several parameters, and is accordingly complex.

A typical application for a gate receiving the bass drum by a microphone. Since the skin of a kick drum is stimulated by other sound sources to vibrate, and even in low attenuation reverberates long, the microphone picks up no clean tone. Through a gate only the actual pulse while hitting the bass drum is transmitted. This is the sound of the bass drum clear and the interaction of multiple sound sources more transparent and " crisp ".

Since the advent of Transientendesignern the use of gates for sound design on drums is similar more or less become obsolete, as these devices are considerably more extensive possibilities - even polyphonic - have and are easier to use.