JP2009181064A - Pickup device of keyboard harmonica - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pickup device of a keyboard harmonica which can provide natural tone and enough sound volume and has well-balanced whole sound range with less keyboard noise. <P>SOLUTION: An air hole 18 passing through the inside and outside of an air box 17 is formed in a part of the air box mounting a plurality of reeds for generating vibration sound with airflow as a pickup device for converting sound of a keyboard harmonica into an electric signal. A vibration plate 19 is arranged on a position to receive an air vibration generated inside the air box through the air hole, and a microphone for converting the air vibration by the vibration plate into the electric signal is attached outside the air box. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pickup device for converting the sound of a keyboard harmonica into an electrical signal.

  A keyboard harmonica called Melodyon (trademark) or the like is a musical instrument having a mechanism in which when a breath is blown into the air outlet, the airflow passes through the lead assigned to the keyboard and is exhausted from a valve that is opened and closed by the keyboard. Since it is an acoustic instrument, for example, there is a limit on the upper limit of the volume, and in order to exceed the limit, a process for converting it into an electrical signal is required.

  As a method for converting air vibration sound into an electric signal, 1) a microphone is applied from the outside, 2) a piezoelectric element is attached inside and extracted as an electric signal, and 3) a microphone is attached inside. However, the method 1) can produce the natural sound quality inherent to the instrument, but the volume is low and it is easy to cause howling. The method 2) is loud, but the sound quality changes and is unnatural. The method of 3) picking up noise is the sound itself that can be heard inside the main body, and there is a lot of noise such as keystrokes, and it is difficult to balance with only one. There are problems such as being blurred and undesirable.

  On the other hand, there is an invention relating to a harmonica-type keyboard instrument disclosed in Japanese Patent Laid-Open No. 9-274486 as an adjacent technology. Although the invention is a keyboard instrument that is operated by holding it in a harmonica type hand, it is clear from the purpose of enabling playing and speaking, it does not emit exhalation and produce sound, but it is simply similar in shape However, since it has a keyboard corresponding to the scale and emits an onomatopoeia, it cannot be applied to a process of converting into an electric signal of a keyboard harmonica. On the other hand, U.S. Pat. No. 4,497,234 relates to an acoustic attachment for a musical instrument, and uses an electronic acoustic pickup element. However, when used in a harmonica, a member that covers the entire exhaust port is required. It will be very difficult to handle.

JP-A-9-274486 U.S. Pat. No. 4,497,234

  The present invention has been made paying attention to the above-mentioned points, and its problem is to provide a pickup device for a keyboard harmonica that can obtain a natural sound quality and sufficient volume, has a good balance in the whole range, and has little keyboard noise. It is. Another object of the present invention is to provide a keyboard harmonica pickup device that is small and easy to handle.

  In order to solve the above-mentioned problems, the present invention relates to a pickup device for converting the sound of a keyboard harmonica into an electric signal. A ventilation hole is formed through the inside and outside, a diaphragm is arranged at a position to receive air vibration generated inside the air box through the ventilation hole, and a microphone for converting the air vibration generated by the diaphragm into an electric signal is provided outside the air box. Means for providing an attached configuration is provided (the invention according to claim 1).

  The keyboard harmonica pickup device according to the present invention extracts air vibrations by forming a vent hole leading to the inside of the air box in a part of the air box equipped with a plurality of leads that generate vibration sound by airflow. . That is, the present invention adopts a method of taking out and picking up the vibration sound created in the keyboard harmonica, thereby obtaining a natural sound quality.

  For example, when the air box is equipped with a lead plate composed of a large number of leads from a low sound part to a high sound part, it is desirable to form a vent hole at a position outside the high sound part. Inside the air box, air vibrations according to the instrument sound occur, and if the air is connected, the sound can be picked up at any position in the air box. However, since the sound of the lead is directly picked up near a specific lead, it is desirable to pick up the sound at a position away from any lead. At that time, it is judged that the vibration of the bass is more easily transmitted to the farther, and therefore it is judged that a good balance can be obtained by picking up the air vibration at the tip of the treble part as described above. It is what has been.

  When supplementing the explanation in relation to the above, it is as already explained that a loud sound can be obtained when a microphone is arranged inside the air box, but the microphone is also easily damaged by the humidity inside the air box, There is a tendency for the high frequency range to fall and the sound to tend to be crowded. On the other hand, in the present invention, sound can be picked up from the outside of the air box through a vent hole opened there, and without being damaged by moisture, depending on the size, thickness, material, etc. of the diaphragm The sound quality can be corrected, and the sound volume close to the configuration in which the microphone is arranged inside the air box can be obtained.

  The vibration plate is disposed at a position that receives air vibration generated in the air box through the vent hole. Therefore, in the present invention, since the vent hole opened in the air box can be taken out outside after being closed with a diaphragm, the sound generation configuration as a keyboard harmonica is completed inside the air box. In addition, since the pickup method is used to extract the vibration sound created inside the air box, the influence of moisture does not affect the microphone.

  As the diaphragm, a sheet-like member made of rubber or synthetic resin is used. Any rubber or synthetic resin may be used as long as it satisfies the condition of elastic sheet material. For example, natural rubber, synthetic rubber such as chloroprene rubber (CR), or polyethylene terephthalate (PET) ), Synthetic resin such as urethane, cloth, paper, other diaphragms of microphones, materials used for speaker edges, and the like can be used. It is important to install the diaphragm in an airtight state so that air inside the air box does not leak to the outside, and to prevent the vibration of the diaphragm from being hindered or causing malfunction. is there. Further, the diaphragm is not limited to a single sheet and is not limited to a uniform structure. For example, it is possible to adopt a structure in which the central part is hard and the periphery thereof is soft like a cone and an edge of a speaker.

  And the microphone which converts the air vibration by the said diaphragm into an electric signal is attached and comprised on the musical instrument main body side in the position substantially independent from the said diaphragm. Further, it is desirable that the diaphragm is hermetically fixed to the outside of the air box in which the air holes are formed, and the microphone is disposed so as to face the diaphragm with a minute interval. The type of microphone can be arbitrarily selected, but generally speaking, a dynamic microphone is preferable to a condenser microphone that easily picks up noise.

  Further, it is desirable that the microphone is attached to a member on the main body side provided independently of the air box via a suspension. The suspension is a means for buffering and removing unwanted vibrations to be transmitted to the microphone, and is effective in reducing keyboard noise. For this reason, the movable surface of the microphone held by the suspension is arranged substantially parallel to the diaphragm surface, and the buffering action is performed while maintaining the substantially parallel arrangement.

  Since the present invention is configured and operates as described above, it is possible to provide a pickup device for a keyboard harmonica which can obtain a natural sound quality and a sufficient volume, has a good balance in the whole range, and has little keyboard noise. Can do. In addition, according to the present invention, the air vibration inside the air box of the keyboard harmonica main body is transmitted to the diaphragm provided in the air box, and the vibration is picked up by the microphone, so that the size of the keyboard harmonica is hardly affected. In addition, it is possible to provide a keyboard harmonica with a pickup device that is small and easy to handle as in the case where the present device is not provided.

  Hereinafter, a keyboard harmonica 10 to which a pickup device according to the present invention is applied will be described in more detail with reference to the illustrated embodiment. FIG. 1 is an external view of a keyboard harmonica 10 to which a pickup device according to the present invention is applied. 11 is a musical instrument body, 12 is a keyboard, 13 is a detachable mouthpiece, and 13a is a detachable portion. This keyboard harmonica 10 has a known mechanism that emits sound by blowing air through the mouthpiece 13 so that the airflow passes through the lead 14 assigned to the keyboard 12 and exhausts from the valve 12a opened and closed by the keyboard 12. It is what you have.

  The illustrated one has a plurality of leads 14 and is equipped with a lead plate 15 consisting of low, middle and high frequency leads as shown in detail in FIG. The plate 15 covers the upper surface of the air box 17 in an airtight manner. A vent hole 18 is formed at an end portion of the air box 17 located outside the treble portion lead plate 16 (see FIGS. 4A, B and 7).

  The air hole 18 has a horizontally long opening adapted to the cross-sectional shape of the air box 17 in order to pick up air vibration generated inside the air box as effectively as possible. Even if the opening area is small, a certain amount of air vibration can be picked up. However, in order to effectively use a sound wave that is a dense wave as energy, the structural strength is maintained with respect to the cross-sectional area of the air box 17. It is desirable to have a sufficiently large area in the range to be obtained.

  The air box 17 is provided with a vent hole 18, and the diaphragm 19 is disposed at a position where the air vibration is generated inside the air box through the vent hole 18. Is provided (FIG. 7A). The diaphragm mounting portion 20 has a plane portion 21 arranged in a direction rising substantially perpendicular to the longitudinal direction of the air box 17 and an edge frame portion 22 surrounding its outer edge, and the edge frame portion 22 vibrates. The plate 19 is bonded all around and is airtightly attached (FIG. 7B).

  The edge frame portion 22 is formed with a slight step as compared with the flat portion 21, and therefore the diaphragm 19 is located a little step away from the flat portion 21 where the air holes 18 are opened. become. Reference numeral 23 denotes a protrusion, which is provided on the flat surface portion 21 located substantially at the center of the vibration plate 19 in order to prevent the vibration plate 19 from adhering to the flat surface portion 21 and preventing the vibration of the vibration plate 19 from being obstructed. ing.

  In order to convert the vibration of air by the diaphragm 19 into an electric signal, a microphone 24 is attached to the outside of the air box. The microphone 24 is disposed so as to face the diaphragm 19 with a small gap, and a side cover that is a member on the main body side so as to perform a buffering action while maintaining a substantially parallel arrangement with the diaphragm 19. 29 is attached via a suspension 25 (see FIG. 6). In addition, 24a has shown the terminal and exists in the back surface of a microphone.

  Each of the diaphragm 19, the suspension 25, and the microphone 24 has the form illustrated in FIG. Among these, the diaphragm 19 is made of a sheet made of chloroprene rubber (CR) having a thickness of about 0.5 mm, and is formed in a rectangular shape having a sufficiently large area with respect to the vent hole 18. The suspension 25 is formed of a rubber material having good vibration absorption, and has a ring portion 26 to which the microphone 24 is fitted and attached, and three support legs 27 protruding outward from the ring portion at equal angular intervals. Each leg end portion 28 is elastically fixed to a support portion 30 formed on the side cover 29. A dynamic microphone is used as the microphone 24 and is fixed to the ring portion 26 so that the movable surface thereof is arranged substantially parallel to the diaphragm surface.

  A cord 31 for output is connected to the terminal 24a of the microphone 24, so that a signal current is output to an apparatus including an external amplifier connected at a jack 33 through an electronic device mounted on the board 32. (See FIG. 6). In FIG. 6, 34 is a volume, and 35 is a knob for controlling the volume.

  In the above example, when the performer blows exhalation into the keyboard harmonica 10 with the mouthpiece 13 and any one of the keys 12 is pressed to vibrate the lead 14, and air vibration is generated inside the air box 17, the air hole 18. The diaphragm 19 connected to the inside at the end of the high pitched portion of the air box 17 vibrates due to the air vibration. The vibration of the diaphragm 19 is captured by the microphone 24, transmitted as a signal to a device connected to the apparatus via the jack 33, and emitted as a musical sound from the speaker of the device.

  The sound of the keyboard harmonica 10 thus produced by the apparatus according to the present invention is well-balanced in the entire low-frequency range or high-frequency range, and well reproduces the characteristics of the keyboard harmonica 10 being used. be able to. Further, since the air box 17 is hermetically sealed and the means for taking out the internal air vibration by the diaphragm 19 is taken, only the air vibration can be taken out to the microphone 24 without being affected by the humidity inside the air box.

1 shows a keyboard harmonica to which a pickup device according to the present invention is applied, in which A is a plan view with a part omitted, and B and C are side views of left and right ends. It is a cross-sectional view same as the above. It is a longitudinal cross-sectional view similarly. An air box used for the present invention is shown with a part omitted, A is a plan view, and B is a longitudinal sectional view. The components of the pickup device according to the present invention are shown, wherein A is a diaphragm, B is a suspension, and C is a side view and a front view of a microphone. It is a perspective view which shows the principal part of the pick-up apparatus which concerns on this invention. The principal part of the pick-up apparatus which similarly concerns on this invention is shown, A is a side view which shows a diaphragm attachment part, B is a side view which shows the state which attached the vibration plate to A. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Keyboard harmonica 11 Musical instrument body 12 Keyboard 13 Mouthpiece 14 Lead 15 Lead plate 16 High range lead plate 17 Air box 18 Air hole 19 Diaphragm 20 Diaphragm mounting part 21 Plane part 22 Edge frame part 23 Projection 24 Microphone 25 Suspension 26 Ring Part 27 Support leg 28 Leg end part 29 Side cover 30 Support leg 31 Code 32 Substrate 33 Jack 34 Volume 35 Knob

Claims (4)

A pickup device for converting the sound of a keyboard harmonica into an electrical signal,
A ventilation hole that passes through the inside and outside of the air box is formed in a part of the air box equipped with a plurality of leads that generate vibration noise due to the air current, and the vibration plate is located at a position that receives air vibration generated inside the air box through the air hole. A keyboard harmonica pick-up device having a configuration in which a microphone is disposed outside the air box to convert air vibrations generated by the diaphragm into an electrical signal. 2. The keyboard harmonica pick-up device according to claim 1, wherein the air box is equipped with a lead plate composed of a number of leads extending from the low sound part to the high sound part, and the vent hole is formed at a position outside the high sound part. 2. The keyboard harmonica pick-up device according to claim 1, wherein the diaphragm is hermetically fixed to an air box outside the ventilation hole, and a microphone is disposed so as to face the diaphragm with a small interval. 2. The keyboard harmonica pickup device according to claim 1, wherein the microphone is attached to a member on the main body provided independently of the air box via a suspension.

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