DE3929726A1 - Sound generating system for electronic musical instrument - Google Patents

Abstract

A musical instrument such as a piano has a resonance surface (11) from which project sound lugs (13) that have the strings (14) lying against a curved surface. Butt into the lugs are a number of sensors to sample the oscillations generated from a control unit. The sound emission provided from the resonance surface (11) is in the manner of an electromagnetic loudspeaker. In order to transmit signal components a pair of drive elements (20 and 30) are provided that have pins (21,31) coupled to the lugs. Each have excitation coils (22,32) within permanent magnets (24,34) that provide horizontal and vertical components.

Description

The invention relates to a musical instrument, in particular another piano or grand piano, with strings over bridges are excited and excited to vibrate, and with a plate-shaped sound body that just or slightly arched like one or more layered soundboard from a well-known factory is trained.

Musical instruments with strings stretched over bridges , especially pianos or grand pianos has been very popular for centuries.

However, their use is limited. From the reverse exercise is often perceived as disturbing the still imperfect music produced during practice.

So-called digital are used to improve the possibilities pianos known, since about 1987 also in versions are on the market for domestic use. You own Keyboards that of traditional pianos or Resemble wings. Detect sensors or other elements, determine which key is pressed and use an electrical data processing device Signal that corresponds to the associated sound values. With different mechanisms at the same time the strength or speed can be determined with the button is pressed; from this one can Determine the volume value.  

The electrical signal corresponding to the sound values is now a device for sound radiation guided. This is usually a sound speakers who either firmly in the musical instrument are built in or externally, for example as parts of a radio plant, can be connected.

Digital pianos are compared to conventional pianos very competitive in price. You bid on it also the advantage that headphone connections before can be seen which is a prak for the environment enable table to play the piano without noise. By the presence of a data processing device alienation of the sound can also be deliberate cause, for example unusual tem perforations instead of the commonly used today "well-tempered" pianos.

Are therefore all sorts of electro with the digital pianos African gadgets possible, so can their sound quality for the originally intended purpose, namely the simulation of a conventional piano, not satisfy. There is no authentic one Sound, but the impression always remains to have synthetic music in front of you. The playback of electrical signals through conventional loudspeakers chersysteme has, due to physical reasons, some gravity deficiencies. Playback on two separately provided loudspeakers convey one spatial impression, which however does not match that of conventional pianos achieved a diffuse sound field is comparable. Due to the design, they do not arise linearities with regard to frequency and phase response as well Swing-in and swing-out behavior, resulting in a sound falsification leads. The greater the deflections of the mem bran, the stronger this effect occurs in Er apparition.

The object of the invention is therefore a genus moderate musical instrument, especially a piano or a grand piano with strings stretched over bridges are and are excited to vibrate, to propose compared to pianos a further usability owns.

This object is achieved in that the webs be spaced and contact-free from the sound body (Reso nanzboden) that sensors on the webs for Sampling of the web vibrations are provided output digital signals to a control unit that the control unit converts signals into sound values and processed and the processed signals to a Device for emitting sound, and that the device for sound radiation the plate-shaped moderate electrodynamically excited sound body (Reso nanzboden), the membrane of at least one electromagnetic speaker consisting of a pot-shaped permanent magnet and a voice coil, the voice coil of at least one loudspeaker via a drive tappet on the plate-shaped sound attacks the body and the electromagnetic Speakers the elek corresponding to the sound values trical signals are supplied.

The piano music played by the pianist is played through this novel musical instrument in first-class, hardly distinguishable from a conventional piano reproduced sound quality and dynamics. By the use of a soundboard made of materials, otherwise used for pianos is a achieved lifelike sound.

This improvement in sound quality in relation to digital pianos is achieved, although at the same time one  Improving and expanding opportunities against over conventional pianos.

If desired, the sound emission to the outside can be clear be reduced. That means the piano at the same keystroke can be played loudly or quietly can. For this, only those from the sensors Process signals given to the control unit processes that their forwarding to the device for Sound emission takes place with the proviso that the Schwin to give a reduced amplitude.

Basically, music playback via headphones, So it is possible without any external sound.

It is also possible to have one on the piano or grand piano record the piece played and record it nete piece then play directly, and without loss of quality. This completely enables novel methods of piano lessons in which So far digital pianos due to their falsifying Sound could not find any use. Well now however, it is possible for the student to make his own mistakes, especially in terms of expression, emphasis, etc., to demonstrate immediately. Because the structure of the music strumentes practically identical to that of a piano or wing, it also has their sound quality and properties.

Even demanding advanced pianists or Composers can use this musical instrument for example as a self-assessment.

It will also be possible to play yourself on the piano to accompany and in this way four, six, eight or multi-hand piano works without much effort  to play. An artificial accompaniment, as has been the case up to now is possible in electronic organs, is very sterile and can with regard to the sound quality Not enough. In contrast, was previously looking for piano works recorded on tape to accompany with a conventional piano fell the discrepancy in terms of sound quality, stim especially dynamic and dynamic. With the novel In contrast, a musical instrument is an accompaniment without it Discrepancy and with excellent piano quality possible.

Of course, an electronic one can also be requested The sound played is alienated. Certain Frequencies can be hidden or amplified or to be rearranged. Artificial reverb can be created or be steamed away. Since the playback over a Soundboard is made as known from pianos is still created as a "classic" Sound.

Can from a separate electronic unit of course also - according to a current mode trend - a complete concert set turned on be played, which then accompanies with the piano will (so-called "concert minus 1").

There is also a fundamental difference to the so-called self-play known since the turn of the century pianos. The principle of which is based on that the sound effect by driving the musical mechanism (Lever mechanism of the mechanics) is achieved. For the tax this self-playing piano to move the game works of pianos and grand pianos are punched strips and other media for the tone sequence and music pieces known.  

In the present invention, however, the Re soundboard and the entire sound box not under Participation of the game excited. Rather works the soundboard as a vibration membrane, by receives impulses from the outside by a drive tappet.

The very special Cha in its sound characteristics The character of the piano sounds is generated digitally and in this form via the vibration exciter in the Original piano sound body fed. This will the sound body in a vibration spectrum and in a kind of excitation from the outside, like this with the original Piano playing otherwise takes place via the sound strings. This leads to a comparable vibration behavior, that the soundboard otherwise through the mechanical Suggestion about the sound strings shows without this have to be excited about the mechanism.

This is mainly because of the special Tension relationships built into a piano sonanzboden special vibration characteristics has, which are based on the construction of the sound body. If such a sound body is stimulated from the outside, it vibrates in the same way as if it were direct excited by the sound strings. The original filter kung the sound body and the soundboard, whereby the sound character of piano sounds is determined, therefore remains.

The one for electro-dynamic excitation or external Electro-dynamic vibration excitation Systems functionally preferably consist of one Magnet system, a voice coil, a centering, a bracket and a coupling. The magnet system of the speaker has a cup-shaped structure with annular air gap. The in the air gap of the  There is a voice coil protruding from the magnet system preferably from a single or multi-layer copper wrap lung on a tubular, from an unmagne table substance applied existing coil carrier is. But you can also by potting or gluing be self-supporting.

The centering is used for distortion-free transmission vibration. It is preferably carried out via a double membrane attached to the fixed part of the Loudspeaker on the one hand and on the drive plunger is attached on the other hand, the drive tappet centrally in a recess of this double membrane is stored. The double membrane holds the coil in the necessary coaxial position in the annular gap around the Vibration coil so tight that small axial vibration movement movements are very easily possible, radial Parallel displacements or tilts of the coil axis however, the greatest possible resistance opposed becomes.

The stationary part of the magnet system or loudspeaker chers is supported by a holder made of metal, wood, Plastic or composite material worn. This hal Can be fixed with the fixed frame, also detent called to be connected. It should be noted that it is preferably shielded from feedback of vibrations of the soundboard on the loudspeaker cher. The bracket can contain actuators with which the magnet in all spatial axes and Levels can be adjusted in their position.

The connection between the voice coil and the reso The soil is preferably made using a coupling head. It has a flange that is flat on the resonance ground and firmly connected to it. On the from  Side facing away from the soundboard has a sleeve, into which the drive plunger can be inserted. The The drive tappet is fastened in the sleeve preferably by gluing or screwing. Sweat or solder connections or the combination of different connection types are also conceivable.

Alternatively, the voice coil can also be for example via an adhesive connection on the type drive tappet be arranged. The drive tappet over in this case also takes on the task of the Spu carrier. On his facing the soundboard In this case it can end with a stopper be closed. This plug is preferred di attached directly to the soundboard, for example screwed tight. The advantage of this embodiment consists in the lower number of construction required parts, since drive tappet and coil carrier from one Element are formed. At the same time it becomes one immediate transmission of vibrations to the Soundboard guaranteed.

Installation is easier if the magnet is a Has centering hole for a centering pin. This will initially align with parts connected to the drive tappet afterwards swing with the soundboard, achieved, in particular which determined the position of the voice coil. Then The magnet and the other stationary ones can eat Parts using the centering pin on the already arranged parts pushed on and aligned will.

For the stability and sound characteristics of the resonance floor as well as for some forms of vibration  transmissions, it is useful if on the Reso still spars are provided which are spaced apart, but run parallel to the webs over which the Strings are tensioned. These bridges come with the strings no longer in touch; however, they run for example, where the sound bars in conventional pianos also run.

An embodiment for the external vibrator excitation of soundboard and sound body consists in that a first mechanical vibration coil over a Drive tappet those tilting vibrations on the sound bridge, which otherwise from the sound strings Sound bridge will be issued. A second vibration coil transfers the horizontal to the soundboard Vibration shares, which otherwise over the sound bridge be transferred to the soundboard.

A particularly high sound quality can be achieved through a construction of three electromagnetic Speakers. A first loudspeaker serves which is located away from ribs and webs, to transmit the vertical vibration to the Soundboard. A second one attacking a dock Loudspeaker transmits horizontal tilting vibrations on the jetty. This will especially make the Upper Swing transfers. A third speaker is working via a lever system with a rocker bearing and over bears due to the higher inertia of such Construction mainly vibrations with less Frequency immediately on the soundboard, that is especially the bass range.

Another improvement in sound quality can be achieve if those bridges over which the strings are tensioned, provided with a tensioning device  that they are pretensioning in the position that take them in traditional pianos. Thereby a special fidelity is achieved.

In the following the invention with reference to the figures described in detail.

Show it:

Fig. 1 is a sectional schematic diagram through a section of an inventive musical instrument,

Fig. 2 shows a section through a special execution form of a loudspeaker,

Fig. 3 is a section through another special guide die from a speaker,

Fig. 4 shows a detail from Fig. 3,

Fig. 5 shows a section through a further embodiment and

Fig. 6 views of a soundboard from above, below and the side.

A musical instrument, not shown, in particular a grand piano or a piano, has a plate-shaped, flat or slightly arched soundboard 11 , of which in Fig. 1 a section and in Fig. 6 a schematic overall view is shown. The soundboard 11 has ribs 12 . On the side facing away from the rib 12 side of the sound board 11 as shown in Fig an Holm. 1 Darge provides be arranged 13 c, of but usually runs parallel to the sound board 11 perpendicular to the ribs 12.

Spaced from the spar 13 runs c a sound bridge. 13 The sound strings 14 are supported on the sound bridge 13 . The sound bridge 13 (possibly several sound bridges 13 , 13 b) runs at a uniform distance from the soundboard 11 . Parallel to him the spar 13 c is seen.

At the sound bridge 13 there are (not shown) a number of sensors for scanning the bridge vibrations, which emit digital signals to a control unit. The control unit converts the signals into sound values and processes them and delivers them to a device for sound radiation.

The device for sound radiation has the soundboard 11 as an essential component. The reso nanzboden 11 is the membrane of at least one electromagnetic speaker. The loudspeaker has a permanent magnet and a voice coil as well as a drive plunger which engages on the soundboard 11 .

For the transmission of the horizontal or the vertical components of the signals resulting from the bridge vibrations of the sound bridge 13 , a drive 20 or 30 (in FIG. 1) is provided in each case.

The drive 20 has a drive plunger 21 which is fastened at one end to the spar 13 c, while its other end is connected via a joint to the voice coil 22 arranged on a tubular coil support 23 . The voice coil 22 with the rohrför shaped coil support 23 are magnet 24 stored in a pot-shaped duration.

If current flows through the voice coil 22 , the tubular coil carrier 23 moves in the magnetic field of the permanent magnet 24 and thus also sets the drive plunger 21 in vibrations, which in turn transmits it to the spar 13 c.

The drive 30 for the transmission of the vertical components of the web vibrations also has a drive plunger 31 , which is arranged on one side in the spar 13 c, on the other side is connected via a joint with a tubular coil support 33 to which a voice coil 32 is attached is. This voice coil 32 is in turn in a permanent mag neten 34 movably mounted. The operation corresponds to that of the drive 20th

The difference between the two drives is that the tubular coil carrier 33 transmits its vibrations axially to a drive plunger 31 , which in turn passes these vibrations as a vertical component on the spar 13 c.

On the other hand, the tubular coil carrier 23 sets the drive plunger 21 in transverse vibrations, which it passes on as a horizontal component to the spar 13 c.

In FIG. 2, a specific embodiment is shown of an inventive device. Here too, the sound of an excitation system is to be transmitted to a sound body, namely a soundboard 11 . The excitation system includes a drive plunger 41 which is moved by the movement of a voice coil 42 with a tubular coil carrier 43 in a magnet 44 . A magnet core 45 belongs to the magnet 44 . The magnet 44 is also enclosed by a lower pole plate 47 and an upper pole plate 48, the upper pole plate 48 having a central opening in which the tubular coil carrier 43 is arranged with the voice coil 42 axially.

The drive plunger 41 is attached to a coupling head 46 , which in turn is attached to the tubular spool carrier 43 .

The transmission of the vibration from the drive plunger 41 to the soundboard 11 does not take place directly, but via a lever system. For this purpose there is a rocker bearing 51 between the soundboard 11 and a lever arm 52 which is arranged essentially parallel to the soundboard. The lever arm 52 is coupled at one end to the drive plunger 41 , at the other end it is mounted on the soundboard 11 with a fastening 53 . The rocker bearing 51 is arranged between the two elements 41 and 53 .

To connect the coupling head 46 with the rohrför shaped coil carrier 43 , a hard adhesive is suggested, for guiding the voice coil one or more centering membranes can also be used.

This lever-like or rocker-like construction is primarily used to transmit deep tones. Due to the inertia of the lever system (this can also be reinforced by suitable elastic material for the rocker bearing 51 ), only those movements of the drive tappet are transmitted which last for a certain period of time. But this is only the case for low-frequency vibrations. By appropriately designing the lever, the preferred frequency range of the tones can also be selected. Through the use of several such levers or rocker systems with different specifications at different points on the soundboard, a lifelike transmission in the bass range can be achieved in this way.

In FIGS. 3 and 4, a construction is shown, which is mainly used for the distribution of sound in the middle frequency range. It transmits all vibrations directly from the magnet system to the soundboard.

A drive plunger 31 acts on the soundboard 11 . The drive plunger 31 is connected to a voice coil 32 , which is mounted on a tubular coil support 33 in a magnet 44 . A magnet core 45 belongs to the magnet 44 (as in FIG. 2). The magnet 44 is also enclosed by a lower pole plate 47 and an upper pole plate 48, the upper pole plate 48 having a central opening in which the tubular coil carrier 33 is arranged with the voice coil 32 axially.

A double membrane is used for centering. The upper centering membrane 61 is attached to a coaxial spacer ring 62 . This coaxial spacer ring 62 is in turn attached to the upper pole plate 48 . The outer edge of the upper centering membrane 61 is thus stationary. It is ring-shaped and therefore has an inner circular recess. The tubular coil carrier 33 with the voice coil 32 extends through this recess. The upper centering membrane 61 is attached to the tubular coil carrier 33 . As can be seen in particular from FIG. 4, this attachment is to be effected, for example, by a snap into an annular groove 63 .

Similarly, a lower centering membrane 66 is received in the annular gap between the magnet 44 and the pole core 45 . It is on the one hand with its outer annular edge on the magnet 44 and on the other hand with its inner, also circular edge of the upper centering membrane 61 is thus stationary. It is ring-shaped and therefore has an inner circular recess. The tubular coil carrier 33 with the voice coil 32 extends through this recess. The upper centering membrane 61 is fastened to the tubular coil carrier 33 . As can be seen in particular from FIG. 4, this attachment can be effected, for example, by snapping into an annular groove 63 .

Similarly, a lower centering membrane 66 is received in the annular gap between the magnet 44 and the pole core 45 . It is attached on the one hand with its outer annular edge to the magnet 44 and on the other hand with its inner, also circular edge at the lower end of the tubular coil holder 33 .

The double membrane with the upper centering membrane 61 and the lower centering membrane 66 is flexible to a certain extent. While it allows axial movement of the tubular coil bobbin 33 of the voice coil 32 around the pole core 45 (the amplitude of which is relatively low), it prevents radial or tilting movements of the tubular coil bobbin 33 . These movements would have a component in the membrane plane and are therefore filtered out.

The upper circular end of the tubular Spulenträ gers 33 is ruled out by a coupling head 46 . This is firmly connected to the tubular coil support 33 by a hard adhesive 71 . The drive plunger 31 is seated on the coupling head 46 . It can, for example, be screwed into the coupling head 46 (cf. FIG. 4).

The drive plunger 31 projects into a sleeve 72 . The sleeve 72 is made in one piece with a flange 73 . This flange is flat and parallel to the soundboard 11 and is fixed, for example, by screws through holes 74 to the soundboard 11 . The sleeve 72 on the flange 73 is opened vertically downward, so that the drive plunger 31 projects precisely into it. An adhesive space 75 is formed between the drive plunger 31 and the inner wall of the sleeve 72 . Venting or filling bores 76 extend through the wall of the sleeve 72 . Through these openings 76 , an adhesive can be introduced into the adhesive space 75 , which leads to a firm connection of the drive tappet 31 with the sleeve 72 and thus with the flange 73 and the soundboard 11 . This connection must be firm in order to be able to transmit the vibrations of the tubular coil carrier 33 safely to the soundboard 11 without any distortions occurring. A sealing ring 77 is formed axially around the drive tappet 31 below the sleeve 72 (shown somewhat distant from the sleeve 72 in FIG. 4). This seals the adhesive space 75 downward and prevents the adhesive from escaping during the adhesive bonding.

In FIG. 5, a construction is shown which, like the conception transmits the Fig. 3 and 4 directly Schwingun gene of the magnet system to the soundboard. 11

A drive plunger 81 , however, also takes over the function of the coil carrier. The voice coil 82 is attached to it. The tubular drive plunger 81 is mounted in a magnet 44 , as was the tubular coil support in the previous embodiment.

On the side facing away from the magnet 44 and the Re sonanzboden 11 facing the drive plunger 81 , a plug 87 is provided which closes the pipe end. Between the plug 87 and the plunger actuator 81 is an adhesive chamber 75 being filled with adhesive and provides a firm and secure connection. The plug 87 is flat on the soundboard 11 facing side and the tube is circular. In order to secure the adhesive connection and to enlarge the adhesive space 75 , the plug 87 pulls somewhat into the sleeve from the end of the drive plunger 81 . The plug 87 is screwed to the soundboard 11 with wood screws 88 .

The magnet 44 has a central vertical to the resonance floor 11 , that is, axially to the voice coil 82 and to the drive tappet 81 , the coil carrier, aligned Zen trier bore 89 .

The assembly of a loudspeaker or a drive unit according to this construction proceeds as follows: First, the plug 87 (consisting preferably of aluminum) is mounted at the intended location with wood screws 88 on the soundboard 11 . The drive plunger 81 with the voice coil 82 is pushed onto it and firmly glued to the plug 87 in the region of the adhesive space 75 .

A centering pin can now (or even before the plug 87 is placed on the soundboard 11 ) inserted into a hole (not shown) centrally in the plug 87 . It is preferably screwed into a thread provided in this bore so that it is exactly perpendicular to the bottom surface of the plug 87 and thus of the soundboard 11 .

The magnet 44 with its centering bore 89 is then pushed onto the centering pin. The centering pin fits precisely through the centering hole 89 . It is thus precisely aligned with the voice coil 82 at the same time. The magnet 44 is then firmly connected to stationary parts, for example the frame or the catch. For this purpose, several adjustment screws are used, which are first tightened evenly on the frame. Then, if necessary, fine-tuning takes place. Finally, the centering pin is unscrewed and pulled out through the centering hole 89 . When the centering pin is pulled out, the magnet 44 remains in the adjusted position due to its attachment.

The adjustment screws determine the position in several ways. A cup-shaped holder extends on the one hand a plurality of lag screws (approximately four) which are screwed into the thread in the magnet 44 and thus connect the holder and the magnet (pull together). The bracket is attached to a stationary part.

Radially through the cylindrical part 44 surrounding the magnet of the pot-shaped holder, several (likewise approximately four) pressure screws, which are supported on the magnet 44 , extend uniformly over the circumference. They are used for the XY orientation of the magnet. Further (about four) pressure screws extend parallel to the centering pin through the cover of the holder and are also supported on the magnet 44 . They are used for Z orientation, although they also influence XY orientation.

An oscillation of the voice coil 82 relative to the magnet 44 now leads to oscillatory movements of the resonance element 11 .

If the wood warps, problem-free readjustment is possible. The system is e.g. B. at Trans port easily disassembled and re-attachable. It is just as easy to replace defective voice coils 82 or voice coils 82 that have been destroyed by overload.

A combination of the embodiments from FIGS . 1 to 5 with one another and also with further loudspeaker devices is possible.

Fig. 6 shows a soundboard 11 with a combina tion of such speaker devices. The soundboard, which is rectangular in plan view, has diagonal, parallel ribs 12 . Slightly curved, but essentially perpendicular to the ribs 12 , a spar 13 c is arranged. In accordance with conventional pianos and grand pianos, a second spar 13 d is provided. The first longer spar 13 , which extends approximately diagonally over the entire soundboard 11 , runs in the same way as the treble bridge or main bridge would run in conventional pianos and grand pianos, while the second shorter spar 13 d, which runs approximately parallel to the first, corresponds to the bass bridge.

In the plan view, the two spars 13 c and 13 d would cover approximately with the web 13 and a web 13 b, which would also be seen, which would be spaced apart from the resonance floor 11 . The strings 14 , which are also not shown in FIG. 6, would be supported on these webs 13 , 13 b.

The soundboard 11 is surrounded on the outside by a frame 15 .

On the soundboard 11 , for example, three devices for vibration transmission are provided in this embodiment. Adjacent to one end of a spar 13 c, but spaced from it and also at a distance from the ribs 12 , a drive 30 is arranged for transmitting the vertical component of the vibrations. This drive 30 corresponds, for example, to the embodiment shown in FIGS. 3, 4 or 5. Attacking directly on the spar 13 c and arranged near its opposite end, the drive 20 is for transmitting the horizontal component of the web vibrations. The principle of such a drive is shown for example in Fig. 1. This drive essentially transmits tones in the disc area.

By contrast, the third drive 40 , which is arranged between the two bars 13 c and 13 d, is also used for transmission in the low-frequency range and is also spaced apart from the ribs 12 . This drive is designed in accordance with the embodiment shown in FIG. 2.

Claims (16)

1. musical instrument, in particular piano or grand piano, with strings which are stretched over bridges and are excited to vibrate, and with a plate-shaped sound body which is flat or slightly curved in the manner of a single-layer or multi-layer soundboard made of known materials, characterized in that the webs ( 13 , 13 b) are spaced apart and contact-free from the sound body (soundboard 11 ) in that sensors are provided on the webs for scanning the web vibrations, which emit digital signals to a control unit that the control unit signals in Converts and processes sound values and outputs the processed signals to a device for sound radiation, and that the device for sound radiation has the plate-shaped, electro-dynamically excited sound body (soundboard 11), which has the membrane of at least one electro-magnetic loudspeaker, consisting of a pot-shaped permanent magnet ( 24 , 34 , 44 ) and a voice coil ( 22 , 32 , 42 , 82 ) forms, the voice coil engages at least one loudspeaker via a drive plunger ( 21 , 31 , 41 , 81 ) on the plate-shaped sound body and the electromagnetic loudspeaker (s) that match the sound values corresponding electrical signals are supplied. 2. Musical instrument according to claim 1, characterized in that the drive plunger ( 31 , 41 , 81 ) runs least a loudspeaker with its longitudinal axis normal to the plate-shaped sound body (Reso nanzboden 11). 3. Musical instrument according to claim 1 or 2, characterized in that the plate-shaped sound body (soundboard 11 ) is equipped with a reinforcing frame extending along the entire edge of the plate. 4. Musical instrument according to one of the preceding An sayings, characterized in that the plates shaped sound box from the built-in soundboard a piano or grand piano is formed. 5. Musical instrument according to one of the preceding An sayings, characterized in that a tension device is provided which the webs in a Form that keeps the arrangement in ready to play Kla four or wings. 6. Musical instrument according to one of the preceding claims, characterized in that with the Re sonanzboden ( 11 ) several electro-dynamic loudspeakers are connected, one of which with its voice coil ( 32 ) via one with its longitudinal axis normal to the soundboard ( 11 ) Running on the tappet ( 31 ) and another with its voice coil ( 42 ) on one end of a double-armed lever ( 52 , 53 ) which runs in a plane parallel to the soundboard ( 11 ) and extends over a slidable abutment in the longitudinal direction of the lever (Rocker bearing 51 ) in the manner of a rocker on the Re sonanzboden ( 11 ) supports and with its other end via an anchoring part (attachment 53 ) is firmly connected to the soundboard. 7. Musical instrument according to claim 6, characterized in that the double-armed lever ( 52 , 53 ) made of an elastically resilient material, such as aluminum or glass fiber reinforced plastic, and the abutment (rocker bearing 51 ) made of a material of greater hardness, such as steel or ceramic exists, and that the double-armed lever ( 52 , 53 ) is held against the abutment with pretension and the abutment is designed as a tilting roller. 8. Musical instrument according to one of claims 6 or 7, characterized in that the with the normal (vertical) on the soundboard ( 11 ) engaging plunger ( 21 , 31 , 81 ) equipped speakers (drive 30 ) in the treble area and the double-armed lever ( 52 , 53 ) on the soundboard ( 11 ) attacking speakers (drive 40) are arranged in the low frequency range. 9. Musical instrument according to one of claims 6 to 8, characterized in that a further loudspeaker (drive 20 ) is provided for detecting the tilting vibrations of the soundboard ( 11 ), the coil carrier ( 23 ) extending in the direction of the longitudinal axis of the voice coil ( 22 ) in a plane runs par allel to the soundboard ( 11 ) and is held at the upper end of a spar ( 13 c) extending and anchored in this drive tappet ( 21 ). 10. Musical instrument according to one of the preceding claims, characterized in that the drive plunger ( 31 , 41 ) at least one loudspeaker at its end facing the pot-shaped permanent magnet ( 34 , 44 ) with an end with a diameter of the voice coil ( 32 , 42 ) adapted massive ring body (coupling head 46) made of solid non-magnetic material, such as aluminum, copper or ceramic, on which a tubular coil carrier ( 33 , 43 ) with the winding of the voice coil ( 32 , 42 ) arranged thereon in the annular gap of the pot magnet is held. 11. Musical instrument according to claim 10, characterized in that the tubular coil support ( 33 , 43 ) with the solid on the drive plunger ( 31 , 41 ) fixed ring body (coupling head 46 ) is held by an adhesive connection. 12. Musical instrument according to one of the preceding claims, characterized in that the drive plunger ( 81 ) of at least one loudspeaker is also the coil carrier for the voice coil ( 82 ) assigned to it. 13. Musical instrument according to claim 12, characterized in that the drive plunger ( 81 ) is tubular and is closed at its end facing the soundboard ( 11 ) with a stopper ( 87 ), which in turn is attached to the soundboard ( 11 ). 14. Musical instrument according to one of the preceding claims, characterized in that the magnet ( 44 ) at least one speaker with a Zen trier bore ( 89 ) is provided for a centering pin. 15. Musical instrument according to one of the preceding An sayings, characterized in that the tax unit with sound recording and / or playback devices is connected.   16. Musical instrument according to one of the preceding claims, characterized in that on the soundboard ( 11 ) adjacent to the webs ( 13 , 13 b) spars ( 13 c) are provided which are spaced from the webs ( 13 , 13 b) .