The voltage threshold for triggering a voltage-controlled filter (VCF) in audio applications can vary depending on the specific VCF circuit and its design. VCFs are a type of analog electronic circuit used in audio synthesis and processing to alter the timbral characteristics of a sound by selectively allowing certain frequencies to pass while attenuating others. They are commonly used in synthesizers and electronic music equipment.
The voltage threshold for triggering a VCF typically refers to the level of the control voltage (CV) input that will cause the filter to respond or activate. This CV input is often used to modulate parameters such as the cutoff frequency or resonance of the filter. The actual voltage threshold can be different for different VCF designs and manufacturers.
In many modular synthesizer systems, for example, the voltage threshold for triggering a VCF might be around 0 to 5 volts. However, some VCFs might be designed to respond to different voltage ranges, and there is no universal standard for this threshold.
To determine the voltage threshold for a specific VCF, you should refer to the manufacturer's documentation or specifications for the particular model you're working with. It's also important to note that VCFs can have various modes of operation, and the voltage threshold might apply to different modulation sources or functions within the circuit.
Always refer to the documentation and specifications provided by the manufacturer to understand the voltage ranges, control behavior, and modulation capabilities of the specific voltage-controlled filter you're working with.