Sound adjusting system and electronic musical instrument

An electronic keyboard musical instrument, comprising:

• a keyboard;
• a musical-sound signal generating circuit configured to generate a musical-sound signal in accordance with an operation of the keyboard;
• at least one speaker configured to emit sound in accordance with the musical-sound signal generated by the musical-sound signal generating circuit;
• a casing which accommodates, in an inner space thereof, at least one circuit component and the at least one speaker and which supports the keyboard such that a performance operation portion of the keyboard is exposed;
• and
• at least one resonator disposed in the casing,
• wherein the casing includes a sound emission path by which the sound emitted by the at least one speaker is introduced to an exterior of the casing via the inner space so as to permit the sound to propagate to the exterior, and
• wherein the at least one resonator includes:
• at least one first resonator whose control point is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a first frequency, the at least one first resonator resonating at the first frequency so as to reduce the sound pressure at the position corresponding to the antinode of the sound pressure in the natural vibration mode at the first frequency;
• and,
• at least one second resonator whose control point is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a second frequency which is different from the first frequency and at which is generated a counterforce that suppresses a vibration of the at least one speaker caused when the sound is emitted, the at least one second resonator resonating at the second frequency so as to reduce the sound pressure at the position corresponding to the antinode of the sound pressure in the natural vibration mode at the second frequency.

An electronic keyboard musical instrument, comprising:

• a keyboard;
• a musical-sound signal generating circuit configured to generate a musical-sound signal in accordance with an operation of the keyboard;
• at least one speaker configured to emit sound in accordance with the musical-sound signal generated by the musical-sound signal generating circuit;
• a casing which accommodates, in an inner space thereof, at least one circuit component and the at least one speaker and which supports the keyboard such that a performance operation portion of the keyboard is exposed;
• and
• at least one resonator disposed in the casing,
• wherein the casing includes a sound emission path by which the sound emitted by the at least one speaker is introduced to an exterior of the casing via the inner space so as to permit the sound to propagate to the exterior, and
• wherein the at least one resonator includes:
• at least one first resonator whose control point is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a first frequency, the at least one first resonator resonating at the first frequency so as to reduce the sound pressure at the position corresponding to the antinode of the sound pressure in the natural vibration mode at the first frequency;
• and,
• at least one third resonator whose control point is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a third frequency different from the first frequency, the at least one third resonator resonating at the third frequency, whereby the antinode of the sound pressure in the natural vibration mode at the third frequency is located at a position at which the sound emission path communicates with the exterior of the casing.

A sound adjusting system, comprising:

• a sound-signal generating circuit configured to generate a sound signal;
• at least one speaker configured to emit sound in accordance with the sound signal generated by the sound signal generating circuit;
• a speaker accommodating body which accommodates, in an inner space thereof, the at least one speaker;
• and
• at least one resonator disposed in the speaker accommodating body,
• wherein the speaker accommodating body includes a sound emission path by which the sound emitted by the at least one speaker is introduced to an exterior of the speaker accommodating body via the inner space so as to permit the sound to propagate to the exterior, and
• wherein a control point of the at least one 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 at least one speaker, and
• wherein the at least one resonator resonates at the specific frequency so as to adjust the sound pressure in the natural vibration mode at the specific frequency, whereby the sound is emitted from the sound emission path to the exterior of the speaker accommodating body.

A sound adjusting system, comprising:

• a sound signal generating circuit configured to generate a sound signal;
• at least one speaker configured to emit sound in accordance with the sound signal generated by the sound-signal generating circuit;
• a casing which accommodates, in an inner space thereof, at least one circuit component and the at least one speaker, and
• at least one resonator disposed in the casing,
• wherein the casing includes a sound emission path by which the sound emitted by the at least one speaker is introduced to an exterior of the casing via the inner space so as to permit the sound to propagate to the exterior, and
• wherein the at least one resonator includes:
• at least one first resonator whose control point is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a first frequency, the at least one first resonator resonating at the first frequency so as to reduce the sound pressure at the position corresponding to the antinode of the sound pressure in the natural vibration mode at the first frequency;
• and,
• at least one second resonator whose control point is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a second frequency which is different from the first frequency and at which is generated a counterforce that suppresses a vibration of the at least one speaker caused when the sound is emitted, the at least one second resonator resonating at the second frequency so as to reduce the sound pressure at the position corresponding to the antinode of the sound pressure in the natural vibration mode at the second frequency.

A sound adjusting system, comprising:

• a sound-signal generating circuit configured to generate a sound signal;
• at least one speaker configured to emit sound in accordance with the sound signal generated by the sound-signal generating circuit;
• a casing which accommodates, in an inner space thereof, at least one circuit component and the at least one speaker;
• and
• at least one resonator disposed in the casing,
• wherein the casing includes a sound emission path by which the sound emitted by the at least one speaker is introduced to an exterior of the casing via the inner space so as to permit the sound to propagate to the exterior, and
• wherein the at least one resonator includes:
• at least one first resonator whose control point is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a first frequency, the at least one first resonator resonating at the first frequency so as to reduce the sound pressure at the position corresponding to the antinode of the sound pressure in the natural vibration mode at the first frequency;
• and,
• at least one third resonator whose control point is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a third frequency different from the first frequency, the at least one third resonator resonating at the third frequency, whereby the antinode of the sound pressure in the natural vibration mode at the third frequency is located at a position at which the sound emission path communicates with the exterior of the casing.

An electronic keyboard musical instrument, comprising:

• a keyboard;
• a musical-sound signal generating circuit configured to generate a musical-sound signal in accordance with an operation of the keyboard;
• a key support member which supports, from below, the keyboard and the musical-sound signal generating circuit;
• at least one speaker configured to emit sound in accordance with the musical-sound signal generated by the musical-sound signal generating circuit;
• a speaker box which is disposed below the key support member and which accommodates, in an inner space thereof, the at least one speaker;
• and
• at least one resonator disposed in the inner space of the speaker box,
• wherein the at least one resonator is formed of a tubular body in which one of longitudinally opposite ends thereof is closed so as to provide a closed end portion and the other of the longitudinally opposite ends thereof is open so as to provide an open end portion,
• wherein the at least one resonator is disposed such that the open end portion is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a specific frequency at which is generated a counterforce that suppresses a vibration of the at least one speaker caused when the sound is emitted, and
• wherein the at least one resonator resonates at the specific frequency so as to reduce the sound pressure at the position corresponding to the antinode of the sound pressure in the natural vibration mode at the specific frequency.

A sound adjusting system, comprising:

• a sound signal generating circuit configured to generate a sound signal;
• at least one speaker configured to emit sound in accordance with the sound signal generated by the sound signal generating circuit;
• a speaker box which accommodates, in an inner space thereof, the at least one speaker;
• and
• at least one resonator disposed in the inner space of the speaker box,
• wherein the at least one resonator is disposed such that an open end portion thereof is located at a position corresponding to an antinode of a sound pressure in a natural vibration mode at a specific frequency at which is generated a counterforce that suppresses a vibration of the at least one speaker caused when the sound is emitted, and
• wherein the at least one resonator resonates at the specific frequency so as to reduce the sound pressure at the position corresponding to the antinode of the sound pressure in the natural vibration mode at the specific frequency.

An electronic keyboard musical instrument, comprising:

• a casing;
• a keyboard disposed along a front surface of the casing and including a plurality of keys;
• at least one sound emission hole formed in the front surface of the casing at a height position higher than a height position of the keyboard;
• a musical-sound signal generating circuit disposed in an inner space of the housing and configured to generate a musical-sound signal in accordance with an operation of the keyboard;
• at least one speaker configured to emit sound in accordance with the musical-sound signal generated by the musical-sound signal generating circuit;
• and
• at least one resonator disposed in the inner space of the housing,
• wherein the casing includes a sound emission path by which the sound emitted from a sound emission surface of the at least one speaker passes through the at least one sound emission hole via the inner space of the casing so as to permit the sound to propagate to an exterior of the casing, and
• wherein a portion of the at least one resonator is open so as to provide an open portion and the at least one resonator is disposed such that the open portion 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 of the housing by driving of the at least one speaker.

An electronic keyboard musical instrument, comprising:

• a keyboard;
• a musical-sound generating circuit configured to generate a musical-sound signal in accordance with an operation of the keyboard;
• at least one speaker configured to emit sound in accordance with the musical-sound signal generated by the musical-sound signal generating circuit;
• and
• a casing which accommodates, in an inner space thereof, at least one circuit component and the at least one speaker and which supports the keyboard such that a performance operation portion of the keyboard is exposed, and
• at least one resonator which is disposed in the inner space of the casing and a portion of which is open so as to provide an open portion,
• wherein the casing defines, as the inner space, a lower first chamber and an upper second chamber which are partitioned partially by a key bed on which the keyboard is mounted,
• wherein the casing defines sound emission paths through which the sound emitted by the at least one speaker propagates to an exterior of the casing,
• wherein the sound emission paths include:
• a first sound emission path which permits the sound emitted from a sound emission surface of the at least one speaker to propagate directly to the exterior of the casing;
• and a second sound emission path which permits the sound emitted by the at least one speaker to propagate to the exterior of the casing via at least one sound emission hole formed in the second chamber over the keyboard, and
• wherein the at least one resonator is disposed such that the open portion 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 of the casing by driving of the at least one speaker.