JPS6236239B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multiplayer circuit in an electronic musical instrument, particularly a small electronic musical instrument equipped with a single-stage keyboard.

For example, a large electronic musical instrument is equipped with two or more types of sound source circuits and a multi-stage operation keyboard, and at the same time,
It is installed in a sound source circuit such as a tone forming circuit and a sound rise/fall adjustment circuit to create a musical tone similar to the tone of a desired instrument, so that a single instrument can achieve the same effect as an ensemble of two or more instruments. This is done to enhance the performance effect. However, in this case, it is not easy to play because both hands must be used. Therefore, beginners often end up abandoning the system without making full use of its performance.

On the other hand, even in a small electronic musical instrument with a single keyboard, it is possible to generate two or more types of musical tones by incorporating multiple sound source circuits, but since only one keyboard is used to operate these, they are identical. Only an ensemble based on the melody is possible. Therefore, compared to large electronic musical instruments, they have the advantage of being easier to play, cheaper, and easier to get used to, but they have the disadvantage that they not only tend to be monotonous in performance, but also lack depth.

Although it is not possible to perform a performance close to an ensemble of two or more completely independent instruments like a large electronic musical instrument, the present invention does not allow for a performance that is close to an ensemble of two or more completely independent instruments, but for example, as shown in the musical score in Fig. Sending out the musical tones of the tone,
A desired melody tone starting at the same height as A, such as B, can be transmitted, so that, for example, musical tone A can be decorated with musical tone B.
This kind of ensemble format is often seen, for example, in ensembles between the shakuhachi, which plays a lengthy melody, and the shamisen, which plays the same melody but often adds so-called "joint hands" here and there. This is often seen in ensembles with other musical instruments, and even if it cannot cover all ensemble formats, it can improve the performance effect more than enough for a small electronic musical instrument. Next, the details will be explained using the drawings.

Fig. 2 is a circuit diagram of an embodiment of the present invention that enables ensemble performance using the musical tones of two types of musical instruments, or solo performance using the respective musical tones, and Fig. 3 is a diagram showing the relationship between the keyboard and the performance style selection switch. It is. In Figure 2, KV is the keyboard circuit, of which K is the keyboard,
V is a voltage (current) generation circuit that generates a voltage corresponding to the pitch of the played keyboard to the bus line.
Send to BU. M ₁ and M ₂ are first and second musical tone generating circuits, each consisting of the following parts.
S ₁ and S ₂ are sound source selection switches, such as semiconductor switching elements, and VCO ₁ and VCO ₂ are sound source oscillators, such as voltage-controlled oscillators, which send out an output at a frequency corresponding to the magnitude of the voltage sent from the keyboard circuit KV.
C ₁ and C ₂ are voltage holding capacitors, which are connected to the input sides of the voltage controlled oscillators VCO ₁ and VCO ₂ to hold the voltage sent out from the keyboard circuit KV. T ₁ and T ₂ are musical tone transmission control circuits, which are formed by, for example, a transistor with a grounded emitter, and the output of the tone generator oscillator is applied to the base, and the output of the performance style selection circuits FS ₁ and FS ₂ , which will be described later, is applied to the collector. . FS ₁ and FS ₂ are performance style selection circuits, each of which is formed from the following parts. E ₁ and E ₂ are DC control power supplies, K ₁₁ , K ₁₂ and K ₂₁ , K ₂₂ are first and second performance style selection switches, and these switches are operated with the right hand, for example, as shown in Figure 3a. In electronic musical instruments in which a chord key group CK is provided on the installation surface of the keyboard K so that it can be operated with the left hand, the chord key group CK is provided close to the chord key group CK. It is provided close to one end of the keyboard K. Note that a push button switch is suitable as this switch. _D11 ,
D ₁₂ , D ₂₁ and D ₂₂ are backflow blocking diodes,
R ₁ , R ₂ and C ₃ , C ₄ are resistors and capacitors, which adjust the rising and falling speeds of the collector voltages of the control transistors T ₁ and T ₂ to generate the sound source oscillator.
The outputs of VCO ₁ and VCR ₂ are given rise and fall characteristics specific to the desired musical instrument. SG ₁ and SG ₂ are control signal generation circuits for _the sound source selection switch.
FF ₂ is a flip-flop which receives signals from the performance style selection switches K ₁₁ , K ₁₂ and K ₂₁ , K ₂₂ and sends on/off control signals for the sound source selection switches S ₁ and S ₂ . MM ₁ and MM ₂ are monostable multis, and the above-mentioned second performance style selection switch K ₁₂ ,
When K ₂₂ is turned on, a short pulse signal is sent that turns on the sound source selection switches S ₁ and S ₂ for a short time. Then, the voltage holding capacitors C ₁ and C ₂ described above are made to hold the bus line voltage. PO ₁ and PO ₂ are OR circuits that control the sound source selection switches S ₁ and S ₂ . next
SC is a speaker circuit, TO ₁ and TO ₂ are tone forming circuits, AMP is an amplifier, SP is a speaker,
Tone forming circuits TO ₁ and TO ₂ convert the output of the sound source oscillator obtained from the control transistors T ₁ and T ₂ , respectively, into a waveform corresponding to the desired musical instrument, and convert the output to the amplifier.
AMP amplifies the mixed output and makes the speaker sound. Next, the operation of this embodiment circuit will be explained.

Performance style selection switch for first musical tone generation circuit _M1
Once K ₁₁ is turned on, flip-flop FF ₁
DC control power supply voltage _E1 is applied to the output, and its output becomes "1". Therefore, this output is an OR circuit.
The sound source selection switch _S1 applied via _PO1 is turned on. On the other hand, when the switch _K11 is turned on, a collector voltage with a rising speed determined by the resistor _R1 and the capacitor _C3 is applied to the collector of the control transistor _T1 by the power source _E1 . Therefore, when the keyboard K is operated, the voltage controlled oscillator VCO ₁ sends out a corresponding frequency output based on the voltage sent out based on this, and a melody tone corresponding to the keyboard operation is sent out from the speaker SP. Such an operation is similarly performed by the second tone generating circuit _M2 by turning on the performance style selection switch _K21 . Therefore, the performance style selection switch
By turning on _K11 or _K21 , solo performance can be performed by operating the first or second musical tone generation circuit _M1 or _M2 , and by turning on _K11 and _K21 at the same time. This allows an ensemble performance using two or more types of musical instrument sounds.

Next, when the performance style selection switch _K11 of the first musical tone generation circuit _M1 is turned off and _K12 is _turned on, the output of the flip-flop _{FF1 is} " 1” to “0”, and at the same time the monostable multi
MM ₁ works. For this reason, sound source selection switch S ₁
is a monostable multi applied through the OR circuit PO ₁
The output of MM ₁ turns on for that pulse width, and the voltage holding capacitor C ₁ holds the voltage on the bus line BU at the moment K ₁₂ was pressed. Therefore, the voltage controlled oscillator VCO ₁ continues to send out a frequency output determined by this holding voltage, and the control transistor T ₁ is operated by the voltage E ₁ applied to the collector to apply an oscillation output to the speaker SP.
A constant sound determined by the frequency output is continued to be emitted until the sound source selection switch _S1 is turned on again. This kind of operation is performed using the performance style selection switch K ₂₁ .
The same operation is performed by the second tone generating circuit _M2 by turning off K22 and turning on _K22 .

Therefore, by turning on the performance style selection switch _K11 of the first musical tone generation circuit _M1 and the performance style selection switch _K21 of the second musical tone generation circuit _M2 , the selection switches _S1 and _S2 are turned on. If the output voltage of the keyboard circuit KV is commonly applied to each voltage-controlled oscillator VCO ₁ and VCO ₂ and the keyboard is operated, it is possible to play the same melody as in the first measure of the musical score in Figure 1, for example. can. For example, if you press the first note "G" on the keyboard of the second measure and at the same time turn off the performance style selection switch _K11 and turn on _K12 of the first musical sound generation circuit _M1 , the sound source selection switch _K12 Due to the voltage held in the voltage holding capacitor C ₁ at the moment when is pressed, the voltage controlled oscillator VCO ₁ continues to send out a frequency output corresponding to the "G" note of the musical instrument A in FIG. On the other hand, at this time, the tone source selection switch _S2 of the second musical tone generation circuit _M2 continues to be in the on state by turning on the switch _K21 and turning off the switch _K22 , and its voltage controlled oscillator
The output of the keyboard circuit KV is added to VCO ₂ .
For this reason, the pitch of the first note is set to instrument A by keyboard operation.
It sends out a frequency output corresponding to the melody of instrument B in Figure 1, which starts with the same pitch as the note "G", and supplies the mixed output of the first and second musical tone generation circuits M ₁ and M ₂ to the speaker SP. do. Therefore, the duet shown in the musical score of FIG. 1 can be performed. When the performance of the second measure is finished and the third measure begins, the performance style selection switch _K11 is turned on and _K12 is turned off, and the first and second musical tone generation circuits _M1 and _M2 Since a frequency output corresponding to the operation of the keyboard K is applied to the speaker SP, it is possible to play the same melody again using two types of musical tones.

Although the present invention has been described above with reference to one embodiment, it goes without saying that triplet, quartet, etc. can be performed by increasing the number of tone generating circuits. In addition, in the above example, an OR circuit was used to select the flip-flop and monostable multi output to operate one sound source selection switch, but as shown in the partial circuit diagram shown in Figure 4, a parallel switch outside _S1 is used. A switch Sd ₁ is provided, and the switch S ₁ is controlled on/off by the output of flip-flop FF ₁ , and Sd ₁ is controlled as a monostable multi-MM _1.
The on/off control may be performed by the output of the . In addition, as shown in the partial circuit diagram shown _in FIG. 4b, for example, a _third
Switch K ₁₃ is provided, flip-flop FF ₁
If this is set to "0" and the monostable multi MM ₁ is made inactive, it is possible to repeat and produce a note that has been held once, making it possible to perform a wider range of performances. In addition, in the operation explanation using the above example circuit,
For one measure, the performance style selection switch was turned on to continuously output a certain sound. For example, in the musical score shown in Figure 1, the third note "A" of instrument B
When you press the key, the performance style selection switch K ₁₂
If you turn off and then on, voltage holding capacitor C ₁ will be connected to the keyboard circuit corresponding to the “A” note.
Maintains the output voltage of KV. Therefore, the second bar is composed of two sounds: the continuous sound of "G" and the continuous sound of "A", and can be varied.

As is clear from the above explanation, according to the present invention, even in a small electronic musical instrument equipped with only one set of keys, it is possible to perform not only solo performances but also two performances of the same melody with the simple operation of switching a switch.
It is possible to perform a duet or a duet with different melodies, although incomplete, and the performance effect of a small electronic musical instrument can be brought close to that of a large electronic musical instrument. Therefore, even beginners can easily perform at a high level using a small electronic musical instrument, which is cheaper than a large electronic musical instrument.

[Brief explanation of the drawing]

FIG. 1 shows a musical score showing an example of a performance according to the present invention;
The figure is a circuit diagram of an embodiment of the present invention, FIG. 3 is a diagram showing an example of the relationship between a keyboard and a performance style selection switch, and FIG. 4 is a diagram of a modification of the present invention. KV...Keyboard circuit, _M1 , _M2 ...Musical tone generation circuit,
S ₁ , S ₂ ... Sound source selection switch, C ₁ , C ₂ ... Voltage holding capacitor, T ₁ , T ₂ ... Musical sound transmission control circuit, VCO ₁ , VCO ₂ ... Voltage controlled oscillator, SC ...
Speaker circuit, F ₁ , F ₂ ... Performance style selection circuit,
K ₁₁ , K ₁₂ ... 1st performance style selection switch, K ₂₁ ,
K ₂₂ ...Second performance style selection switch, SG ₁ , SG ₂ ...
...Signal generation circuit, SC...Speaker circuit.

Claims (1)

[Claims] 1. A keyboard circuit that sends out an output voltage corresponding to the operating keyboard, a sound source selection switch connected to this keyboard circuit, a voltage holding capacitor on the input side, and a musical sound transmission control circuit on the output side, and the sound source selection switch a voltage controlled oscillator that oscillates when given the keyboard circuit output; first and second performance style selection switches; and a circuit that generates a control signal for the tone source selection switch thereby; By turning on the selection switch, the tone selection control circuit is controlled to apply the output of the voltage controlled oscillator to the speaker circuit at the same time as the tone source selection switch is turned on. A performance style selection switch that controls the musical tone transmission control circuit so as to apply the output of the controlled oscillator to the speaker circuit, and at the same time turns on the sound source switch for a period of time necessary for the voltage holding capacitor to hold the voltage of the keyboard circuit output. It is equipped with a required number of musical tone generating circuits consisting of the following, and by turning on the first performance style selection switch of the desired musical tone generation circuit, solo performance can be performed, and by turning on the desired number of first performance style selection switches, it can be performed in ensemble based on the same melody, or can play the same melody. When playing in ensemble, turn off the first performance style selection switch of the desired musical tone generation circuit,
By turning on the second performance style selection switch, the output voltage from the keyboard operated at that time is
An electronic musical instrument characterized in that a voltage holding capacitor holds a sound to output a constant pitch sound, and another musical sound generation circuit sends out a melody sound in response to keyboard operations.