Electronic metronome
AssigneeSeiko Instruments & Electronics Ltd.
InventorHaruzo Yoshikawa
Life of this patent
Estimating the term…
Abstract
The electronic metronome has a baton reciprocatingly driven by a pulse-drive stepper motor powered by a varying voltage source. Drive circuitry generates and applies drive pulses to the stepper motor, each drive pulse being composed of a plurality of individual pulses having a pulse width which varies in accordance with variations of the voltage source and with the selected tempo at which the baton reciprocates. The stepper motor is thus driven at a constant torque-frequency characteristic despite fluctuations in the power source voltage and the tempo of the metronome.
Claims8
An electronic metronome comprising:
- a tempo synthesizing circuit for receiving the output signal from a reference oscillator;
- a rhythm signal generating circuit for receiving the output signal from said tempo synthesizing circuit;
- a speaker for generating a sound in response to the output from said rhythm signal generating circuit through a stress rhythm sound synthesizing circuit;
- a stepper motor driving signal generating circuit for receiving the output from said tempo synthesizing circuit;
- a stepper motor connected to be driven by said stepper motor driving signal generating circuit;
- and a reduction gear assembly equipped with a baton and connected to be driven by said stepper motor;
- so as to reciprocatingly drive said baton.
In an electronic metronome having a baton which is reciprocatingly driven by a step motor powered by a voltage source whose output voltage varies:
- voltage detecting means for detecting the output voltage level of the voltage source and producing a corresponding voltage detection signal;
- and circuit means for generating drive pulses each composed of a plurality of individual pulses and applying the drive pulses to the step motor to rotationally drive the step motor in alternating forward and reverse directions of rotation to effect reciprocation of the baton, the circuit means including means responsive to the voltage detection signal for varying the pulse width of the individual pulses of each drive pulse in accordance with the variation of the output voltage of the voltage source.
Dependencies are inferred from the claim text.