Back to results
US 2016/0118031 A1Published application
State detecting circuit, key-press detector, and musical instrument
AssigneeYamaha Corporation
InventorMasatsugu OKAZAKI
Life of this patent
Estimating the term…
Abstract
A state detecting circuit has a first switch circuit connected to a first selection line and a second switch circuit connected to a second selection line. The first switch circuit includes two switches, and performs an arithmetic operation of ON/OFF states of the switches and a selection signal. Thus, since one switch circuit performs an arithmetic operation using ON/OFF states of the two switches, the number of selection lines and the number of parts can be reduced.
Claims9
A state detecting circuit comprising:
- a plurality of switch circuits each comprising at least one switch which switches between ON state and OFF state in response to a change in a physical amount which is a target of detection, each of the switch circuits outputting a state signal which changes according to an ON/OFF state of the switch included in the switch circuit itself,
- wherein the plurality of the switch circuits include one or a plurality of three-state switch circuit comprising two switches in which thresholds of the physical amount at which the switch switches between the ON state and the OFF state are different from each other, inverting the state signal when the physical amount exceeds a smaller one of the thresholds of the two switches, and further inverting the state signal when the physical amount exceeds a larger one of the thresholds of the two switches.
Dependencies are inferred from the claim text.