Yamaha Corporation

Hirohisa Kuroyanagi

Masaaki Mizuguchi

For detecting a difference in rendition, a bar incorporated in an electronic percussion system includes a supporting block having a surface portion, a top member having a first surface portion and a second surface portion located at the reverse side of the first surface portion, and a force sensitive unit intervening between the surface portion of the supporting block and the second surface portion of the top member and converting a force acting on the first surface portion into an electric signal, wherein the first surface portion is formed with a rugged surface which causes a striker to intermittently strike the first surface portion when the striker moves along the first surface portion.

Bar for use in electronic percussion system

There is provided a force sensitive device comprising a first conductive layer, a second conductive layer resiliently deformable to come into contact with the first conductive layer, a certain level of voltage being applied across the first and second conductive layers, a plurality of spacing members intervening between the first conductive layer and the second conductive layer and formed of an insulating material, and a resilient top layer of an insulating material overlaid on the second conductive layer and operative to cause the second conductive layer to come into contact with the first conductive layer under a force acting on a surface portion thereof, wherein the contact portion varies in area depending upon a position of the surface portion where the force acts so that the force sensitive device produces the signal having a voltage level which varies depending upon the position where the force acts.

Force sensitive device

An electronic tuning apparatus is constructed of an input device for inputting a tone signal to be measured, a signal generating circuit for generating a plurality of reference frequency signals, respectively, corresponding to a plurality of tone names independently for each tone name, a plurality of display devices, respectively, corresponding to a plurality of tone names and a plurality of display control devices, respectively, corresponding to a plurality of tone names. To the signal generating circuit, a scale selecting switch and a pitch adjustor are connected. Each display control device is constructed so as to display an agreement of the frequency of said tone name at a predetermined octave with the frequency of said input tone signal in the display device corresponding to said tone name. The display is realized by an on-off arrangement pattern composed of a plurality of turned-on luminous elements and a plurality of turned-off luminous elements. According to the electronic tuning apparatus of the present invention, it is not necessary to take a lot of time and labor for changing-over an octave and a tone name and, as the measurement results are displayed at once after a tone to be measured is inputted, a tuning for each tone name can be performed easily and quickly. Furthermore, a tuning, based on the equal temperament scale and the just intonation scale, is possible.

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Shizuoka, Japan

Hirohisa Kuroyanagi