Yamaha Corporation

Takashi Kato

Takashi Fujita

Hideki Ishihara

Akiko Shinjo

Rento Tanase

Yoshihiro Natsume

Naohide Kohyama

Keiichi Fukatsu

Yutaka Toyama

Kei Kunisada

Takahiro Okumura

Takao Koyama

Fusako Ishimura

Akito Oba

An electronic keyboard musical instrument, including: a housing having a lower casing having a bottom wall and an upper casing having a top wall, left and right walls being formed on at least one of the top wall and the bottom wall; a keyboard portion held by the housing; at least one speaker disposed at at least one end portion of the housing in its key arrangement direction, such that its sound emission surface faces rearward; a sound adjuster disposed in the housing so as to be located outward of the speaker in the left-right direction; and a plurality of protruding portions formed at the one end portion so as to protrude from the at least one of the top and bottom walls, wherein the sound adjuster is held by at least one of the protruding portions.

Electronic keyboard musical instrument

An electronic keyboard musical instrument, including: a keyboard; a musical-sound signal generating circuit; at least one speaker for emitting sound in accordance with a generated signal; a speaker accommodating body accommodating the speaker in its inner space; and at least one resonator disposed in the accommodating body, wherein the accommodating body includes a sound emission path by which the sound emitted by the speaker is introduced to an exterior of the accommodating body via the inner space for sound propagation to the exterior, a control point of the resonator is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a specific frequency generated in the inner space by driving of the speaker, and the resonator resonates at the specific frequency for adjusting the sound pressure, whereby the sound is emitted from the sound emission path to the exterior.

Sound adjusting system and electronic musical instrument

A sound generating device of an electronic keyboard instrument, which eliminates overlap between frequency bands to avoid sound wave interference to stabilize acoustic characteristic. Woofers are disposed at a bottom part of a speaker box and directed downward, and squawkers are disposed at an upper part of the speaker box and directed upward. In a DSP, waveform data selected from waveform data groups are input into a MIX, and a waveform signal containing high and low frequency band components is produced from a signal output from the MIX. In a distributor, the waveform signal is converted into an analog signal which is then separated into a musical tone signal only containing the high frequency band component and a musical tone signal only containing the low frequency band component, and these musical tone signals between which there is no frequency band overlap are supplied to the tweeter and the woofer.

Sound generating device of electronic keyboard instrument

An electronic keyboard instrument that emits sounds in both upward and downward directions from speakers solely for upward sound emission and from speakers solely for downward sound emission to realize acoustics similar to that of acoustic piano, and constitutes rear parts of resonance chambers in a speaker box by a common partition plate to prevent the speaker box from becoming complicated in construction. Woofers directed downward are disposed at a lower part of the speaker box, and squawker directed upward are disposed at an upper part of the speaker box. The internal space of the speaker box is partitioned by one horizontal partition plate into an upper space where resonance chambers for the squawkers are defined by vertical partition plates and a lower space where resonance chambers for the woofers are defined by vertical partition plates. Rear parts of the resonance chambers are constituted by the horizontal partition plate.

Electronic keyboard instrument

An electronic keyboard instrument in which the efficiency of sound emission is enhanced by preventing a soundboard portion having a large vibration amplitude from being hidden by a musical score plate to make sound emission of the soundboard to be hardly hindered by the musical score plate. A musical stand device is disposed rearward of a key-depression part of a keyboard and right above the soundboard, and has a musical score plate disposed close to and parallel to an upper surface of the soundboard when the musical score plate is in a fallen state. The soundboard is excited for sound production by transducers disposed on a lower surface of the soundboard. The transducers are disposed at positions where the transducers do not overlap, as viewed in plan, the musical score plate which is in the fallen state.

An electronic keyboard musical instrument capable of performing delicate sound board vibration control based on outputs generated individually for respective ones of transducers, thereby realizing production of natural sounds with sufficient volume, and an easy tone quality adjustment. A sound board is fixed to a frame, and the transducers are mounted to the sound board so as to be spaced from one another. In accordance with first and second performance signals generated in response to a key operation of a keyboard and a damper pedal operation, driving signals for the transducers are individually generated in consideration of characteristics and mounting positions of the transducers, and the driving signals are supplied to the transducers. The sound board is thereby caused to vibrate at a frequency varying according to a tone pitch, thus producing a musical tone and/or a damper tone.

There is provided an electronic apparatus that is free of the problems with the prior art and is capable of achieving higher efficiency of cooling the interior of the casing without sacrificing cost reduction and designing compact in size. A casing houses a plurality of circuit boards having electronic parts mounted thereon and at least one high load part that generates heat. The casing has exhaust ports formed therein for heat radiation and exhaust ports for heat radiation. The plurality of circuit boards are comprised of a first circuit board and a second circuit board. The first circuit board is disposed to extend substantially horizontally, and the second circuit board is disposed to extend substantially vertically with a horizontal gap provided between the first circuit board and the second circuit board. The at least one high load part is arranged below the horizontal gap, and the exhaust ports are arranged above the horizontal gap.

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Hamamatsu, Japan

Takashi Kato