Abstract Keyboard instruments incorporating sound systems for generating musical tones are disclosed. In a first keyboard instrument, speakers are mounted near a keyboard, and are arranged upright to be directed to the keyboard on the front side, thereby allowing a performer to clearly grasp the sound quality of performance tones. In a second keyboard instrument, which comprises a Helmholtz resonator consisting of a resonance port and a cabinet, an electro-acoustic transducer mounted on the outer surface of the cabinet and a driver for driving the transducer so as to cancel an air counteraction from the resonator, the size of a sound system is reduced, and the frequency characteristics, especially the low-frequency reproduction characteristics of the sound system are improved.
A keyboard instrument comprising: a box-like main body case; a keyboard arranged on a front side of said main body case; a slit formed in said main body case so as to be open to the front side; and a speaker unit arranged upright in said main body case on a rear side of said keyboard and having a diaphragm whose axis is directed to said tone escape, wherein said speaker unit includes large- and small-diameter speakers, an inclination of said large-diameter speaker being smaller than that of said small-diameter speaker.
Claim 2
Dependent Claim
91 words
A keyboard instrument comprising: a box-like main body case; a keyboard arranged on a front side of said main body case; a slit formed in said main body case so as to be open to the front side; and a speaker unit arranged upright in said main body case on a rear side of said keyboard and having a diaphragm whose axis is directed to said tone escape, wherein said speaker unit includes large- and small-diameter speakers, an inclination of said large-diameter speaker being smaller than that of said small-diameter speaker.