Musical effect controller with a position sensor comprising a tuned resonant circuit

摘要

A musical effect device receives an input signal from an electronic musical instrument or microphone, and provides an output signal comprising a modified version of the input signal. An effect control circuit coupled between the input and output applies a variable controllable effect to modify the input signal. The musical effect device further comprises a position sensor which senses a position of a moveable mechanical control and uses the result to determine the amount of controllable effect to apply to the input signal. The position sensor comprises: a first tuned resonant circuit (fig 1) such as a spiral coil track on a PCB; drive electronics to drive the circuit at a resonant frequency; and an electrically reactive element associated with the moveable mechanical control. The electrically reactive element may be a passive tuned resonant circuit (fig 2). The musical effect device may take the form of: an expression foot pedal (fig 5), a slider knob (fig 6), a rotary knob, or a wearable item (fig 7) such as jewellery or clothing.