Home› BSS User Forum › BSS Archive Threads› Discussion› London Architect with Soundweb London

Control gate for 1 signal by using another

cisswtlcisswtl Posts: 5
in London Architect with Soundweb London
I was wondering if there is a processing object in London Architect, with 2 inputs, where the gate on the first input will open only when a signal is detect on the second input? It would be like the gated automixer, only the gate would open, not close, when a signal is detected in the threshold input. Or is the gated automixer capable of this already?

The closest i've come to this is feeding a noise generator into a ducker into the threshold of a gated automixer. When a signal hits the ducker mic input (which doesn't feed out), the noise generator is cut off, and the signal to the gated automixers threshold input is cut off, thereby opening the gate on the inputs. If there is an easier way I would like to know. Thank you.

Comments

  • Kevin BrownKevin Brown Posts: 50
    Add a Gate object, and enable the sidechain input. The gate opens at the top input when signal is detected (i.e. above threshold) at the sidechain (bottom) input.
  • Dan LynchDan Lynch Posts: 472
    Depending on what you're doing with it, you'll probably like the sound of the expander better than the gate. It's much more useful unless what you're looking for is a hard on/off tied to a specific level. In either case, right-click on the processing object, select PROPERTIES, then find \"Show Sidechain Input\" and turn it on.

    The main input is the audio that gets passed to the output. The sidechain input is the audio used to trigger the functionality of the object. A gate with the sidechain turned on is functionally a reverse ducker (look at the control panels side-by-side). An expander with the sidechain turned on is also a reverse ducker, but it uses a ratio below threshold to control the output level rather than just cranking it down when you fall below threshold.

    Alternately, you could also use a modulator. This might be even closer to what you actually want to accomplish. Input1 on the modulator is the signal that's passed to the output. Input2 is the signal that determines the amplitude of the output. So, input1 comes out of the modulator at exactly the volume of input2. CAUTION: modulating an AC signal with another AC signal will cause distortion and a garbage signal. You need to convert the AC audio signal being used for input2 into a DC signal. To do this, run that signal into a meter object with the property \"Enable control output\" turned on. Run the output of the meter into the modulator.

    Dan

    p.s. Yes, you are correct that the modulator is worthless without a meter object in front of the second input of the modulator to convert that signal to DC. Yes, you are also correct that it's really weird that the AC-to-DC conversion functionality isn't just built into the second input of the modulator.
This discussion has been closed.