DE1497856A1 - Circuit arrangement for electrical musical instruments - Google Patents

Description

Hammond Organ Company 1AQ7QCfi

Chicago, in.V USA May 24, 1966

Circuit arrangement for electric musical instruments

The invention relates generally to electrical, especially electronic, musical instruments such as electrical or electronic organs and similar sound producing devices, and more particularly relates to a control device the decay rate or the Kachhalle effect the musical tones produced by such a musical instrument * In particular, the invention is concerned with the Structure of the. Control circuits of such musical instruments, which are used to control the speed at which the ' Amplitude of the sound signal «decreases, i.e. the reverberation effect, set so that the sounds produced by these sound signals depending on the player's request with predetermined Decay rate from its maximum strength can lose weight. With the help of the control circuit according to the invention can depending on the mood of the played Pieces of music and after any selection by the Player numerous pleasant and interesting sound effects are produced.

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Although already electric organs created v ^r are orden in which the decay rate BZV. Since the reverberation of the notes being played can be controlled to some extent by the player, such devices have so far been known, largely limited to systems requiring a large number of expensive electrical components and complicated switches that they are not economical for use in commercial ones Devices were suitable.

Aüfgab.e of the invention is therefore to create a simple one and inexpensive device for use in electrical tone-generating instruments, polygamy "setting the decay rate or the reverberation effect of the Tones stalked by the instrument are made possible by the player. ■

Another aim of the invention is to create a Device of the type mentioned above, which optionally a Long and medium stopping of the tones so that the instrument can be played with practically instantaneous breakdown of the tones able to guarantee what invent in dung sg ems ?, thereby it is achieved that in a system of several im. Instrument used decay control circuits' a certain Voltage is adjusted.

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Koch Another JJr goal is creation a device for setting the connection potential for a tone ignalq.u hurry and the organ Ausgmigsystem activated decay control circuit of a electric organ that controls the amplitude properties of the to change the signal applied to the output system depending on the potential applied to its input able.

Further objects, advantages and features of the invention can be seen even more clearly from the following description of a ■ ' preferred embodiment of the invention with reference to the drawing • nunf;: en, in which -equivalent or similar parts with; respectively the same reference numbers are designated * They show:

1 shows a schematic representation of a preferred embodiment of a decay control circuit of an electrical musical instrument together with associated devices with the features of the invention for controlling the decay rate: the electrical signals transmitted by the decay control circuit to its output line,

Pig * .- 2 a more general schematic "representation of a system of several. Look-swing control circuits of the

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in Pig. 1 type shown for an electrical Musical instrument illustrating the way ' to which the decay rate s through the individual swing control circuits transmitted electrical signals according to the invention can be controlled in groups by a single switching element,

pig. 3j, 4 and 5 are schematic representations showing the Rate of change in the decay properties of the electrical sound signals under different operating modes "illustrate which is shown in FIG. 1 by a decay control circuit Kind to be applied to its output line,

Pig. 6 is a schematic representation of a circle that instead of a component of the circuit according to Pig. can be used in the latter,

Pig. 7 is a schematic illustration to compare the Decay properties of the circuit according to Pig. 5 with those of electrical lonsignals that with two different modes of operation by .one with inclusion of the circle ^ according to Pig. 6 modified tone Decay control circuit to the output system be created, and ■

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fig. 8 and 9 sohematic representations of. Circles that in order to ensure different modes of operation of the arrangement instead of a component of the Circuit according to FIG. 1 can be used in the latter.

In Fig. 1, the invention is schematically applied to the circuit an electric organ of the type widely in use, in which for each the notes corresponding to the notes within the playing range of the instrument in the audible frequency range Signals a separate audio signal source is provided. Each of these ion signal sources can be of any type for example, consist of an electronic oscillator with or without an associated frequency divider. In the illustrated Embodiment is in the interests of the exact Description assumed that the invention is applied to an instrument with a simple manual and with electronic generators is applied as sources of origin for the audio frequency signals. Obviously, however, the invention can also to more than one manual and, if desired, also can be applied to a pedal keyboard.

According to Fig. 1, an indicated by the box H Ausohwing control circuit is via a line 12 to a tone

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signal source 10, for example an electronic oscillator, connected. The Aüsschwing control circuit 14 has a high-value resistor R16 in series with a resistor. stood up R18 of lower resistance, with the common Connection point 20 between these V / Lderstands connected to one side of a diode 24 via a line 22 is. The other end of resistor RI6 is on on line 12 and the other end of resistor R18 is via a line 26 to a low, preferably negative voltage of for example -0.15 "V" leading Bus 28 connected, xlit of the diode 24 is one second diode 30 connected in series, the other side of which again through a resistor R34 and an output line 32 with a leading to the output system of the instrument Manifold 36 is connected ', which' via a Resistor R37 is grounded. The output syst on of the instrument is unspecified as it is not part of the er-. invention, but be of conventional construction and electro-acoustic transducer means for converting the Line 36 have impressed electrical signals in tones can. To the collecting line 36 are still one Number of "resistors R34 ', R34" and R34 "' connected, which each correspond to the V / i of the st and R34 and the Resistances of the other decay control circuits of the organ system represent by way of example. Diodes 24 and 30 are

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switched in opposite directions in such a way that each one of them one occurring at their common junction 38 Derives alternating voltage as a rectified half-wave, when the potential at point 38 exceeds the ignition voltage of the diode in question. The diodes 24 and 30 thus represent a signal transmission device with variable impedance, which normally does not conduct, Gber always ignites as soon as the one at point 38 -Potential exceeds the ignition voltage of the diodes. For this reason, the amplitudes are created over the Diodes transmitted to the output system of the instrument Sound signal depends on the potential applied at point 38. In the described embodiment of the invention The diodes 24 and 30 have the same ignition voltage of 0.6 V each. Diodes suitable for the present cells are the commercially available silicon flat diodes.

The branch point 38 is connected via a high-ohmic resistor R40, with this low-ohmic resistor RA2 in series, and a line 44 to a switch 46, via which the switching control circuit is connected to a bus line carrying a voltage of + 3Y 48 connected -Λ7erden k; -. Rm. The switch Ai can be operated in a well-known manner by a never. des' Pun ", cts. 38 on the ignition

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voltage of the diodes 24 and 30 is increased and the latter to ignite "so that the register is actuated to the output system of the organ and that of the signal source 10 supplied signal to transmit the corresponding signal. When the assigned play button is released, the switch 46 reopened so that the potential of point 38 un- ' ter the extinction voltage of the diodes decreases and makes the latter non-conductive, which prevents the transmission of the signal to the The organ's exit system is interrupted, again will be explained in more detail. ι »

The branch point 50 zy / ischen the resistors R40 and R42 is connected to a bias voltage source with a potential below the ignition voltage of the diodes 24 and 30 via a capacitor 0 ^ 52, for example grounded, and also via a high-resistance resistor R54 and a line 56 a collecting line 58 is connected, which in turn is connected to the movable contact 60-a step switch 62 with several, in the present case three counter-contacts 64j 66 and 68, each of which is below the ignition voltage of the diodes 24, 30, the potential of the capacitor C52 connected Yor voltage source. do not lead to excessive voltage. In the embodiment shown, contacts 64, 66 and 68 are at -20 7, -3 Y or ground potential. The collecting line 58 is also

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to which a number of further resistors S54 ', B54 "and ^ E54 ⁴ " are connected, each of which corresponds to resistor E54 and exemplifies the resistances used in all other decay control circuits of the organ system.

Fig. 2 shows schematically an organ swing-out control circuit with several circles corresponding to the rice 14 described above. Fig. 2 also shows the way on which the decay control circuits in the main circuit are incorporated into the organ. The various parts are denoted in Fig. 2 with the same reference numerals as they are used for corresponding parts according to FIG. 1 ", however, to facilitate the description, provided with the letters a, b and η appended. ■

The outputs of the audio frequency signal generators 10a, 10b, ...... 1On are each via assigned lines 12a, 12b, ...... 12n on the decay control circuit described above 14 ^ corresponding decay control circuits 14a, 14b, ...... 14n coupled. Although in Fig. 2 from There are only three such circles for reasons of illustration are shown., depends on the number of those used in the organ system Decay control circuits, of course, depend on the number of keys on the instrument to which the Invention is applied.

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The decay control circuits T4a-14n are on the one hand over lines 26a-26n assigned to them individually to the 0.15 V collecting line 28, via the respective associated lines 44a - 44n. the key switches 46a-46n and About respectively assigned lines 56a-56η to a single control line 58 and on the other hand via respectively assigned Output lines 32a-32n are connected to manifold 36 connected to the output system of the instrument. . · ■ _ "■

In e.inem organ system in which the amplitude of the voltage applied to the swing-out control circuits signals is about 1.5 T, and the potentials of the lines 28, 48 and 58, the above-indicated ^values: own, be achieved following resistors good results when using :

Component Y / ert E16 47 kXl E18 4.7 ml E34, R34 ¹ , R34 " p P Ir O
C y C- Ά. ^ J _ma E37 ■ 1.0 kil R40 33 k Xl E42 0.1 kilograms E54, E54 ', E54 ", R54 ¹ " 100 k Xl G52 cU / vLc

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The operation of the device according to the invention is described below with particular reference to FIG. 1 and on the assumption that the various components and the potentials of the lines 28, 48 and 58 have the values given above. When the electrical organ is tuned, the sound signal sources deliver their respective sound signals with constant amplitude to the associated swing-out control circuits, where they are impressed on the lines 22. If, as mentioned, the input line 12 _t, an AC voltage of about 1.5 V leads, is the j values given for the resistors R16 and R18, the \ potential of the line 22 from peak to peak at about 150 mV.

the movable contact 60 of the switch 62 rests on the mating contact 68 and the player presses the button assigned to the switch 46 and thereby closes this switch, ί the branch point 38 from the line 48 is a ^! A potential of around 0.7 - 0.8 V is impressed, which means that the capacitor G52 charges at the same time. Since this voltage exceeds the ignition voltage of 0.6 V of the diodes 24 and 30, the diodes conduct the audio signal to the output line 32 and via this to the output system of the instrument. The transmission of this signal to the output system of the instrument lasts as long as the amplitude remains constant

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Switch 46 is closed, i.e. as long as its assigned key is pressed. When the button is released it opens the switch 4-6, whereupon the capacitor G52 mainly discharging through resistor E54, although too a certain discharge through the resistors R34, R37 and E18 takes place. The signal continues to be transmitted with decreasing amplitude via diodes 24 and 30 to the output system applied until the potential of the branching point 38 the extinction voltage of the diodes drops and the transmission of the signal to the output system ceases. The amplitude each of these output signals consequently decreases continuously, so that the tone generated in the output system by this signal when the capacitor G52 is discharged accordingly subsides. As a result of the imprinted on the line 22 through its connection via the line 26 to the line 28 negative bias, the diode 24 ignites a little before the diode 30 when the switch 46 is closed,> and goes out when the capacitor C52 is discharged after "opening." of the switch 46 somewhat later than the diode 30 j this mode of operation ensures a better decay pattern of the on the output line 32 applied signal as possible would be if the diodes 24 and 30 ignited and extinguished at the same time. When the manifold 58 is connected to the grounded counter contact 68 of the step switch 62, the decay takes place from the maximum

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Voltage to the erase potential of diode 20 in about 3 s

instead of. This state is shown in Fig. 3, which the dependence of the voltage of the capacitor C52 on the Time after opening switch 4-6 illustrates which drops exponentially fairly evenly from the maximum value of about 3 T to earth potential »

However, if the movable contact 60 of the switch 62 is switched to the counter contact 66, ie a gate voltage of -3 IT is impressed on the line 58, the decay rate is significantly greater than just described; The voltage drop to the extinction voltage of the diode 30 takes place in this Pail in about one second. This state is illustrated in FIG. 4. S ¹ Ig. In contrast , FIG. 5 shows the still faster decay speed of about 100 ms, which is reached when the movable contact 60 is switched over to the counter contact 64 of the visual switch 62, which is at -20 T. The moment at which the transmission of the signals to the output system ceases, is the point shown in FIGS. 3, 4 and 5, at wel chem, the curve intersects the extinction voltage of the diode 30 at 0.6 Y representing the horizontal line , whereby for reasons of simplification it can be assumed that the ignition and release voltage of the diode have the same value.

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ι Palls wanted an even faster decay rate is, the voltage applied to line 56 of -20 V should not be exceeded, since this is an excessive Reverse voltage through switch 62 during the. periodic increase and decrease in the potential of the Branching point 38 could result, this can can be achieved in that a lower voltage of, for example, +1.5 Y instead of +3 V to the busbar 48 is created. This of course makes the initial signal voltage on output line 32 reduced, therefore it is necessary to put the output signal in to a greater extent to reinforce than if the busbar 48 carries a voltage of 3 Y * This additional gain can, however, without further ado with the help of known conventional Facilities are made.

An improved decay scheme versus yours when in use of the simple resistor R54 on line 56 achieved can be achieved by replacing this resistor with a diode-resistor circuit, an embodiment of which is shown in FIG. According to this figure is between branch point 50 and the manifold 58 a resistor R70 switched on, which is controlled by a resistor R72 is bridged in series with a silicon diode 74. The diode 74 is connected so that it ignites when

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The potential of the branch point 50 exceeds that of the line 58. If this circuit is used instead of the resistor R54, which has a value of 100 kJft, the resistors R70 and R72 preferably have values of 220 kJft, respectively. 100 kSl »

Pig * 7 shows the voltage drop at the branch transition point 38 as a function of the time and the decay properties of the diode 30 to the output line applied! eon signals under different conditions during the discharge of the capacitor 052. As in the case of the Pig * 3 to 5 is the moment in which the transfer of the relevant signals to the output system stops, in Pig. 7 through the points of intersection of the curves with the horizontal line indicating the 0.6 V cable voltage of the diode 30 indicated. In Fig. 7 all curves represent the voltage drop or the signal decay properties for the case that the movable contact 6ü of the switch 62 with the -20 V leading G-egenkontakt 64 is turned over, namely the curve χ relates to the case that the busbar 48 carries a supply voltage of +3 V and is in the line 56 the simple resistor R54 for discharging the capacitor C52 is present, this curve showing that the potential of the delay point 38 after about 10 ms to the deletion voltage of the diode 30 has dropped by about 0.6 V while

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the curve y relates to the case "that the busbar 48 carries a supply voltage of +3 V as in curve χ, but the resistor R54 through the - "- V / resistance diode circuit shown in FIG. 6 This curve shows that the potential of the branch point 38 is already after dropped to the Iqseilspannung of the diodes 24, 30 about 50 ms is, with the largest rope of this dropping happening fairly quickly. The curve ζ finally illustrates the output properties of the signal under conditions similar to those of 'curve y, only with the difference that. >. the busbar 48 carries a supply voltage of +1.5 "V, which has the effect that the potential of the junction point 38. quickly to the erase voltage within about 20 ms of the diodes 24, 30 drops. It is assumed that the decay envelope of the signal is assured a more appealing musical effect, the stronger improved, the more the curve drops at the beginning.

By using the resistor-diode circuit just described according to Pig. 6 achieved better effects. can also be achieved by using a non-linear Y / resistor, "Like a silicon carbide resistor, instead of the resistor R54.

In the above description, the invention is in Yer-

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Binding with Ausohwing-control circuits "it has also been made, which guarantee a stop of an ion, as long as a key-operated switch is closed. Of course, the invention can, however, also be applied to systems that provide other modes of operation, for example to stop systems Modifications of the decay control circuit according to FIG. 1, which make it suitable for use with the systems mentioned, are shown in Pig. 8 and FIG and shown. 9 apply gl Eicher somewhat for other embodiments of swingout Freieen control, to which the invention can be applied.

According to Pig. β the branch point 38 between the diodes 24 and 30 is connected, as in the previously described embodiments, via the resistor R4-0 to the branch point 5t- ¹ , which in turn ti.a. is connected to the operating switch 62 via the Yiiderstarid H54. In Pig. 8 described embodiment of the invention, however, the capacitor G52 is replaced by a capacitor 076 and leads the fourth connection of the 7 branch point 50 to an Ivreis with a resistor E78, the other end of which on the one hand to a capacitor C80 and on the other hand to one side Diode 82 on

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■ is closed! Whose other side is connected to ground * The diode 82 is shuttered et so that they discharge when the Po * ·

, potential of the branch point between capacitor G8Ö and resistor R78 is sufficiently negative. The other

. Allocation of the capacitor C80 is via a resistor

, R84 is connected to a -3 V DC power source and can be grounded via a key operated switch 86. The other components of the register and their connections

'' to the signal source, to the output system, to the operating mode switch 62 and to the manifold 28 are all the same

= ■ as in the embodiment, the invention according to Fig. 1 « Suitable values for the additional components of the circuit according to FIG. 8 the following are: Y / id.erstands R78- and R84 = ■ 100OiXj capacitor C? 6 = 0.47 / UF and capacitor C80 = 20 yUF.

In the operation of the embodiment of the invention, the capacitors G76 and G80 are charged positively when the switch 86 is closed by pressing the associated key, whereby the potential of the branch point 38 is greater than the +0.6 Y amount The ignition voltage of the diodes 24 and 30 is raised and the signal emitted by the signal source 10 passes through the diodes 24 and 30 to the output system of the instrument. The capacitors 076 and Οθφ, on which the original charge of the

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___ _i _J £ Djadensators 080 begin to discharge immediately and thereby lower the potential of the branching point 381 whereby the transmission of the signal to the output. In this connection it should be noted that this effect is due to the original charge of the capacitor 080, which was divided between the capacitors G? 6 and 080 but before the end of the decay cycle is released, the tone is canceled by restoring the direct connection between the capacitor 080 and the -3Y ~ voltage source.

The embodiment according to FIG. 9 practically corresponds to that 8, only with the difference that the branching point 50 is grounded via a capacitor 088 and that between the resistance .B.78 and the branching point between capacitor 080 and diode 82 another one Diode 90 is turned on, which is connected so that they only supply the electricity; Yerzweigungspunkt 50 flow towards leaves. If the other capacitors and resistors according to FIG. 9 have the values given above, the Capacitor 088, for example, have 20 / UF. The working

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as the modified embodiment according to FIG. 9 resembles that of Fig. 8, only with the difference that the capacitor 088 when the key contact opens, 86 before the end of the drop in potential at the branch point 38 below the extinction voltage of the diodes 24, 30 continues is effective even when the capacitor C80 is discharged is. The sound is therefore not in accordance with the circuit Fig. 8 instantly deleted, it just sounds faster than before the key was released.

Obviously, in all embodiments of the invention according to FIGS. 1, 8 and 9, the decay of the signal begins when the charging current for the capacitor or the capacitors of the individual registers is interrupted. In the embodiment according to FIG. ³ T occurs this interrupt by released dej depressed key vird opened wpdurch the switch AC, v / hile the interruption in the circuits shown in FIGS. 8 and 9 produced immediately after closing of the key-operated Seh £ ilters 86 will,

The working method of the (Jesomt-AusEchwing control circuit system when playing tones of all frequencies within the The range of the instrument is shown in FIG. 2. Since the decay control circuits 14a-Hn are parallel to one another

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lines 28, 36 and 58 are connected and via the switches 46a-46n can be connected in parallel to one another to the line 48, any number of Tones "or notes can be played simultaneously by pressing the corresponding keys are pressed or operated, whereby in turn, the respectively assigned switches 46a-46n are closed. Every note falls through with the the position of the movable contact selected by the player 60 of the step switch 62 from a certain speed when the load associated with this tone is above described manner released (Fig. i), posted (Fig. 8) or posted and released (Pig. 9). The invention thus provides a simple device with the help of which the player can choose any one of several possible decay or decay speeds for Practice through all of the musical instrument's appearance control circuits can select signals supplied to the Aus; j; mgsystei.i by simply a single switch member is operated. Through this the invention creates a significant advance over the previously known prior art.

Another advantage of the invention is that it allows the application of work voltages at the branch point allows the opposite of the voltage of the audio signal input ; m of the diode 24 are high, so that a distortion of the wave

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shape of the signal during the decay period below the limit that is perceptible to the ear can be kept "

Although specific embodiments of the invention are shown above; and are described, it will be understood that numerous changes and modifications in configuration and construction can be made by those skilled in the art without departing from the scope and spirit of the invention. For example, the ignition or extinction voltage of the diodes does not need to have exactly the specified value, but can be higher or lower than the specified 0.6 V and can even have negative values. The individual components of the scanning control circuits can also be dimensioned differently - and the absolute values and signs of the voltages impressed on lines Z8, 4-8 and 58 are by no means critical - but can be changed if desired. All these are of course a -Ver'te Fra _r: e of iusv'ahl and the skilled artisan without veiteres the way in which changes in these factors influences the operating characteristics have the swing-out control circuit result. It is also evident that the invention is in no way restricted to the application to the specific decay control circuits described, but also in connection with other decay control circuits such as such

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with transistors, tubes or other solid state switching elements, can be applied in which the transmission of a signal through the decay control circuit of depends on the potential prevailing at a given point. For this reason, the invention is intended to all within changes within the extended scope of protection and Include modifications to the apparatus described and illustrated above where practical the same or equivalent Ilittelii practically the same Results as achieved with the invention can be grounded.

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Claims (1)

P a te nt a "η β ρ r ü ehe -
1. Circuit arrangement for electrical musical instruments with at least one audio signal source and one output system, characterized in that between the * Tonsignalq.urelle and the output system at least one Decay control circuit 'is switched on, which controls the envelope curve properties of the audio signal fed to the output system as a function of the potential of a reference point able to change this steering group, and that a device for applying one of several available potentials to this reference point is provided" 2 * circuit arrangement according to claim 1 with two in series lying, juxtaposed diodes, which are normally block, but in the conductive state from their - common junction point of direct current drain off both sides, characterized in that the Ausv.'ing control circuit has a key-operated Switch for applying a DC voltage with a the potential exceeding the ignition voltage of the diodes has the branch point that the device for BATH 909826/0067 ~ - Applying a potential to this reference point several Voltage s q.u hurry with below the ignition voltage of the. Has diodes lying voltage and that a branch point optionally with these voltage sources connecting circle is provided, which the potential of this branch point is normally below the The ignition voltage of the diodes holds. 3. Circuit arrangement according to claim 2, wherein the Output system having electro-acoustic transducers, characterized in that the decay control circuit ■ two between the audio signal source and the output system has diodes connected in series which are in the conductive state from their common junction point allow direct current to flow off to both sides, and a normally flow at this junction point ineffective, a capacitor and the button-operated Switch containing circuit is connected, which the Yerzv / eigungspunkt when the switch is closed DC current exceeding the ignition voltage of the diodes imprints » 4. Circuit arrangement according to claim 3, characterized in that that the junction point optionally connect with the voltage sources e ^ jade circle between the 909826/0067 BAD Capacitor and the branching point with the normal-. wise ineffective circle is connected and. a salary * - ti. :: ■ » means have for selectively connecting the normally ineffective circuit with- a having Spannungequellen ", so that the capacitor according to Untejibre- monitoring its charge selectively with one of the SET development of the switching device corresponding speed discharge, and the potential of the branch point at the same speed under the The erase voltage of the diodes is reduced. 5. Circuit arrangement according to claim 3, characterized in that that the normally ineffective circle, one coupled to the branch point via an impedance, firmly with a Yors ^^. nnun ^ souelle with under the Ignition voltage of the diodes with voltage connected capacitor and that the savings sources of different, voltage below the ignition voltage of the diodes via a voltage that can be operated in a number of ways Switching device and a second door pedal to the normal • are sometimes connected to an ineffective circuit. 6. Circuit arrangement according to claim 5, characterized in that that the two impedances have different resistances. ■. : BATH ORIGINAL - 27 909826/0067 Circuit arrangement according to Claim 5, characterized in that that the second-mentioned impedance has a greater resistance than the first-mentioned impedance. 8. Circuit arrangement according to claim 5, characterized in that the diodes have practically the same ignition voltage "own* . 9 »Circuit arrangement * according to claim 1, characterized in that that several electrical audio signal sources and several between the lonsignalquellen and the Ausgaiigsystera Enabled registers are provided that the device for creating one of the various Potentials «means to adjust the potential a branch point of the decay control circuit to a certain value when the assigned instrument key is pressed *, and that a device to change the potential of that branch point at a rate selected from among several en is provided when the button is released. 10. Separation control circuit for electrical musical instruments with an electrical audio signal source and one electro-acoustic converter equipment having 909826/0067 BATH ~ " ^{2 &} ~ gaiigsystem, characterized by a control connection having a variable impedance signal transmission device that is normally non-conductive is when any one of several specific potentials is applied to the control terminal, but conductive when the is applied to the control terminal Potential is changed to a potential other than one of the specific ones the input side of the transmission device with changeable Impedance connecting circuit, an output of the transmission device with the output system connecting circle, a circle for setting a selected potential at the control terminal for the purpose of production a non-conductive state, one effectively played with the control terminal, normally ineffective Circle to temporarily override the last-mentioned circle, which when actuated the at the control connection potential, for the purpose of production a signal transmission to said other potential able to change, and a device for delaying the potential transition from said other Potential to the selected particular potential. 11. Exterior control group for electrical musical instruments with an electrical sound signal source and a one 909826 / Q087 BATH ORIGINAL - 29 ^ Electro-acoustic converter device having output system, consisting of a signal transmission device with variable impedance, which is normally non-conductive and which has a branching point, a circuit connecting the audio signal source to the input side of the signal transmission device and a circuit that connects the output of the Signal transmission device. to the output system connecting circuit, characterized by a circuit for setting a specific potential at Yerzweigungspunkt / -and- an input coupled to the Yerzi-veigun _s moved beyond normally ineffective circuit overrides the letzgeriannteri circle which to change the potential of the branch point on actuation 12ο circuit arrangement according to claim 11, characterized in that the signal transmission device with variable impedance becomes conductive when the potential of the. The branching point in one direction exceeds a predetermined voltage so that the potentiometer setting circuit has an impedance for lowering; the potential of the splitting point to be below the predetermined voltage in a gap; with any of several ν ^! - determined G-velocities; Rist and that the normal / otherwise ineffective circle in its operation 909 82 6 / 0.0 67 BAD ORiGtNAL the potential of the branch point on one of the '} in front of "a certain voltage increases in one direction . 13. Circuit arrangement according to claim 12, characterized in that the normally ineffective circle dai3
is key operated and is made effective by pressing an instrument key. 14. Circuit arrangement according to claim 13 »characterized in that the key-operated circle vorbestimuten the potential of the branch point above ae-r
Voltage is maintained as long as the key is pressed. 15 circuit arrangement according to claim 13, characterized in that that the key-operated circuit is a capacitive one Is a circle which, when the button is pressed, is able to cause a discharge via the third-mentioned circle in order to temporarily the potential of the branching point to a predetermined voltage ubersteiren.de voltage to lift and that a device for recharging of the capacitive circuit is provided after releasing the button. - 31 90982 6/006 7 - ₄ , BAD original U97856 Circuit s on order according to Ansijruch 11, characterized in that the normally ineffective circle of Hand "is actuated and is connected to the branching point so that when actuated it" Potential of the point of inclination to a predetermined one Able to raise tension which exceeds tension, that the potential-generating circle with the branch point connected and usually its potential holds at one of several selected voltage below the predetermined potential and that a device for "decelerating the speed the change in the potential of the branch point from a voltage above de3 "predetermined Voltage on the selected one, below the predetermined one Voltage is provided. ORIGINAL BATHROOM 1- ■ '- ■ \ v - ·