Abstract: Disclosed embodiments provide systems and methods related to measuring a frictionless audio-fader position. A frictionless audio-fader position measuring system comprises a control slider, a sensing magnet, at least two magnetic flux sensors configured to output at least one of a voltage or a current based on the position of the sensing magnet and, a processor wherein the processor calculates a correlation between the position of the sensing magnet and a phase angle between the outputs of at least two of the magnetic flux sensors to determine a position of the sensing magnet, wherein the determined position of the sensing magnet controls an amplifier, mixer, and/or other hardware or software component.

Abstract: Disclosed embodiments provide systems and methods related to measuring a frictionless audio-fader position. A frictionless audio-fader position measuring system comprises a control slider, a sensing magnet, at least two magnetic flux sensors configured to output at least one of a voltage or a current based on the position of the sensing magnet and, a processor wherein the processor calculates a correlation between the position of the sensing magnet and a phase angle between the outputs of at least two of the magnetic flux sensors to determine a position of the sensing magnet, wherein the determined position of the sensing magnet controls an amplifier, mixer, and/or other hardware or software component.

Abstract: An audio tone-control circuit includes 4th-order low-pass, 4th-order band-pass, and 4th-order high-pass filter circuits. The 4th-order low-pass filter circuit has a first phase response and receives and filters an audio signal and generates a first output signal therefrom. The 4th-order band-pass filter circuit has a second phase response that is substantially equal to the first phase response and receives and filters the audio signal to generate a second output signal. The 4th-order high-pass filter circuit has a third phase response substantially equal to the first and second phase responses and receives and filters the audio signal to generate a third output signal. The audio-signal circuit also includes a combining circuit that combines the first, second and third output signals into a combined signal. Furthermore, the filter circuits may be 2nd-order filter circuits instead of 4th-order filter circuits.

Abstract: A non-contact fader control uses a movable permanent magnet and one or two Hall-effect sensors to provide a constant, direct current voltage output. Signal conditioning and digital control circuitry linearize the output and otherwise precondition the output for application to a voltage controlled amplifier for the control of audio output in an audio mixing board.