JPS5934320B2 - Automatic arpeggio device in electronic musical instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic arpeggio device for an electronic musical instrument, in which when a key switch is activated, an input pulse to an input terminal is inverted to open a sound source gate circuit and allow a sound source signal to pass through. , after a predetermined time from the activation of the key switch, the key switch is inverted again using a clock pulse generated from a clock pulse generator to close the sound source gate circuit to prevent passage of the sound source signal and generate an output pulse at the output terminal; A plurality of bistable multivibrators configured to immediately generate an output pulse at the output terminal without being reversed by the input pulse when inactive are connected to their output terminals via a gate circuit for positive circulation. They are connected in series, and the output terminal of the final stage positive circulation gate circuit is connected to the input terminal of the first stage conversion circuit to form a positive circulation circuit, and each bistable multivibrator and its input side positive circulation gate are connected in series. A reverse circulation circuit is constructed by connecting a reverse circulation gate circuit in parallel with each circuit, and connecting the output terminal of the bistable multivibrator in the first stage to the input side of the last stage reverse circulation gate circuit. A counting circuit is provided for counting the number of cycles between the circulation circuit and the reverse circulation circuit, and upon completion of counting a predetermined number of circulations in one circuit, the other circuit is caused to circulate, and the sound source that has passed through each of the sound source gate circuits is provided. While the signal is divided into multiple stages by a frequency divider, the outputs of the multiple stages of flip-flop circuits constituting the counting circuit are passed through a matrix circuit to sequentially obtain pulses at each output terminal, and with these sequential pulses, The present invention is characterized in that an arpeggio signal is obtained by sequentially opening gate circuits connected to each output terminal of the frequency divider.

Next, embodiments of the present invention will be described with reference to the attached drawings.

In the drawings, 1-1...1-12 are the first to twelfth key switches, 2-1...2-12 are the first to twelfth sound source signal gate circuits, and 3-1...3-12 are the above-mentioned key switches. 1st to 1st
2 key switches 1-1...1-12 and 1st to 1st
The first to twelfth bistable multivibrators are shown in which two sound source signal gate circuits 2-1...2-12 are connected, and these first to twelfth bistable multivibrators 3-1...
・3-12 is connected in series to its output terminal through the first to twelfth positive circulation gate circuits 4-1...4-12, respectively, and the output terminal of the twelfth positive circulation gate circuit 4-12. is connected to the input terminal of the first bistable multivibrator 3-1 to form a positive circulation circuit 5, and the output terminals of the second to twelfth bistable multivibrators 3-2...3-12 are connected to the input terminal of the first bistable multivibrator 3-1. The input terminals of the first to eleventh bistable multivibrators 3-1...3-11 are connected to the first to eleventh bistable multivibrators 3-1...3-11, respectively.
The output terminal of the first bistable multivibrator 3-1 is connected to the 12th bistable multivibrator 3-1 through the 12th reverse circulation gate circuit 6-12. A reverse circulation circuit 7 was constructed by connecting to the input terminal of the stable multivibrator 3-12.

8 is a repeat pulse generation circuit consisting of a monostable multi-pipe radar that intervenes in common with the forward and reverse circulation circuits 5 and 7, and its input terminal is connected to the 12th forward and reverse circulation gate circuit 4-12, 6.
-12, and its output terminal is connected to the auxiliary gate circuit 4-1.
3, the first bistable multivibrator 3 through 6-13
−1 input terminal and the 12th bistable multivibrator 3
-12 input terminal.

Reference numeral 9 indicates a counting circuit that counts the number of circulations between the forward circulation circuit 5 and the reverse circulation circuit 7, and alternately starts counting the number of circulations in the other circuit upon completion of counting a predetermined number of circulations in one of them. One of the output terminals 9-1 is connected to the control terminals of the first to twelfth positive circulation gate circuits 4-1...4-12 and the auxiliary gate circuit 4-13; The output terminal 9-2 is connected to the first to twelfth reverse circulation circuits 6-1...6.
-12 and the control terminal of the auxiliary gate circuit 6-13.

The input terminal is connected via the 0R circuit 10 to the output terminal of the repeat pulse generation circuit 8 and the output terminal of the start pulse generator 11 consisting of a monostable multipipe radar on the input side of the first bistable multivibrator 3-1. Continuing. The input terminal of the start pulse generator 11 is connected to the differentiating circuit 1.
2 to the key press detection circuit 13, and the input terminal of the key press detection circuit 13 is connected to each of the key switches 1-1...1-.
12 are connected in parallel. The first to twelfth bistable multivibrators 3-1...3-12 are inverted by input pulses to the human input terminals when each key switch 1-1...1-12 is activated, and the pulses are connected. Sound source gate circuit 2-
1...2-12 is opened to allow the passage of the sound source signal,
After a predetermined time, it is re-inverted and the sound source gate circuit 2-1...
2-12 is closed to prevent the sound source signal from passing through, and an output pulse is generated at the output terminal, and the key switch 1-1.
...When 1-12 is inactive, it is configured to immediately generate an output pulse without being reversed by the input pulse. That is, for example, as shown in FIG. 2, each bistable multivibrator 3-1...3-12 is composed of first and second transistors 14 and 15, respectively, and the collector of the first transistor 14 and the collector of the second transistor 15 are connected to each other. A resistor 16 is connected to the base. The bases of the second transistors 15 are connected to the output terminals of the clock pulse generator 18 via diodes 17, and the collectors of the second transistors 15 are connected to the respective key switches 1-1...1. -12 to the input terminal of the detector circuit 13, and to each sound source gate circuit 2-1...2-12 constituted by two diodes. Thus, when the key switches 1-1...1-12 are in the open state as shown in the second diagram, each first transistor 14 of each conversion circuit 3-1...3-12 is 0FF1...1-12. The transistor 15 is in an ON state, and each of the sound source gate circuits 2-1...2-12 is in an open state, preventing passage of the sound source signal. Next, the operation of the first bistable multivibrator 3-1 will be explained in detail.

Now, assuming that the key switch 1-1 connected to the first bistable multivibrator 3-1 is closed, the second transistor 15 is conductive, so the potential of its collector is the zero potential of ground (hereinafter referred to as H). ), and the first sound source gate circuit 2-1 maintains a closed state.

Next, when the negative pulse shown in FIG. In addition, this becomes non-conductive. Thus, the potential of the collector of the second transistor 15 becomes L as shown in FIG. The circuit 2-1 is made conductive to allow the sound source signal to pass through as shown in Figure f. Next, when the clock pulse shown in Figure 3c is applied from the clock pulse generator 18 to the base of the second transistor 15, the second transistor 15 becomes conductive and its collector potential rises as shown in Figure 3b. The first sound source gate circuit 2-1 is cut off to prevent passage of the sound source signal, and the first transistor 14 is rendered non-conductive. At this time, a pulse shown in Fig. d is obtained at the output terminal derived from the collector of the first transistor 14, and this pulse is input to the next stage bistable multivibrator 3-2. Next, key switch 1
When the pulse shown in FIG. 3a is applied to the base of the first transistor 14 while the key switch 1-1 remains open, the first transistor 14 becomes conductive and the second transistor 15 becomes non-conductive. is open, the potential of the collector of the second transistor 15 does not become L. Therefore, the sound source gate circuit 2-2 is not opened and the first transistor
The transistor 14 immediately becomes non-conductive, and the output pulse shown in FIG. 3e is obtained at the output terminal and is applied to the bistable multivibrator 3-2 in the next stage.

The above operation is the same for all of the second to twelfth bistable multivibrators. Next, the operation of the apparatus of the present invention will be explained with reference to FIGS. 1 and 4.

Now, when key switches 1-1, 1-5, and 1-8 for C, E, and G notes are closed to obtain an arpeggio sound, each key switch 1-1...1-12 is connected via line 1 in common. The output terminal of the continuous key press detection circuit 13 becomes L as shown in FIG. A square wave pulse shown in b is obtained.

This pulse then passes through the differentiating circuit 20 and the diode 21 to become a negative pulse shown in FIG. 4c, which is applied to the first bistable multivibrator 3-1. Thus, since the key switch 1-1 is closed as described above, the potential of the collector of the second transistor 15 drops as shown in FIG. 4d, and the first sound source gate circuit 2-1 is opened. The sound source signal passes through. The output of the detector circuit 13 is applied to the start pulse generator 11 and simultaneously to the clock pulse generator 18, which runs free and generates the clock pulses shown in FIG. 3e.

Thus, the first clock pulse generated at time t after the second transistor 15 is turned off becomes the pulse shown in FIG. -1, closes the sound source gate circuit 2-1, and generates a pulse shown in Fig. g at its output terminal, which is input to the second bistable multivibrator 3-2. Since the key switches 1-2, 1-3, and 1-4 of the second, third, and fourth bistable multivibrators 3-2, 3-3, and 3-4 are opened, they can be operated one after another in figures H, l, and 3-4. A pulse is generated as shown in j and applied to the fifth bistable multivibrator 3-5 via a differentiator circuit and a diode.

The fifth bistable multivibrator 3-5 is the key switch 1
-5 is closed, the sound source gate circuit 2-5 is opened as shown in Figure K, and the second clock pulse closes it and generates a pulse as described above, thereby opening the sixth bistable multivibrator 3. -6 is input. The 6th and 7th bistable multivibrator 3-6, 3-7 is the key switch 1-6
. Since it is closed, the sound source gate circuit 2-
8 is opened as in FIG. 1 and closed by the third clock pulse to generate a pulse as described above, which pulse
to 12th bistable multivibrator 3-8...3-
12 and then applied to the repeat pulse generator 8. In this one cycle, a CEG sound source signal is obtained as shown in Figure m. The pulses obtained at the output terminal of the repeat pulse generator 8 are passed through the positive circulation circuit 5 to the 12th pulse generator.
CEG is applied to the input terminal of the bistable multivibrator 3-1, and is scanned in the same manner as described above to sequentially open the first, fifth, and eighth sound source gate circuits 2-1, 2-5, and 2-8. Allows the sound source signal to pass through. In this way, the positive cycle is repeated. The number of cycles is counted by a counting circuit 9. The counting circuit 9 includes three flip-flop circuits 9a, 9b, 9c.
are connected in series, and its output terminal 9-1 is, for example, 4
Until counting is performed, Ll is set so that the other output terminal 9-2 becomes L after counting 4 times.Thus, when 4 circulations are counted, the gate circuit for normal circulation 4 −
1...4-12 and the auxiliary gate circuit 4-13 are closed, and the reverse circulation gate circuits 6-1...6-12 and the auxiliary gate circuit 6-13 are opened. Thus, the pulses output from the repeat pulse generator 8 are sent to the auxiliary gate circuit 6-13.
The signal is input to the twelfth bistable multivibrator 3-12 through.

Since the key switch 1-12 of the second bistable multivibrator 3-12 is open, a pulse is immediately generated at its output terminal in the same way as above, and this pulse is passed through the reverse circulation gate circuit 6-11. is added to the 11th bistable multivibrator 3-11, and similarly the 11th to 9th bistable multivibrators 3-11 are
The signal is inputted to the eighth bistable multivibrator 3-8 through the bistable multivibrators 3-11...3-9.
Thus, since the key switch 1-8 of the eighth bistable multivibrator 3-8 is closed, the sound source gate circuit 2-8 is opened in the same manner as described above to allow the sound source signal of the G sound to pass through. 7th and 6th bistable multivibrator 3-7
, 3-6, the sound source gate circuit 2-5 is similarly opened at the fifth bistable multivibrator 3-5 to allow the sound source signal of sound E to pass through, and then the fourth to second bistable multivibrator 3-4 . . 3-2, the sound source gate circuit 2-1 is opened by the first bistable multivibrator 3-1, and the sound source signal of the C tone is passed through, and then the sound source signal of the C tone is passed through the repeat pulse generator 8. and its output is repeatedly input to the first bistable multivibrator 3-12 via the auxiliary gate circuit 6-13, thereby performing reverse circulation. In this way, forward circulation and reverse circulation are performed, and the sound source signals of C, E, and G sounds are transmitted to the line to which the output ends of each sound source gate circuit 2-1...2-12 are commonly connected. 4
The extraction is repeated three times, and then the extraction is repeated four times as G, E, and C.

These sound source signals are as follows, three 1/2
Input to frequency dividers 22a, 22b, 22c, 1/2, 1
The frequency is divided sequentially into /4 and 1/8. Then, output terminals 23a, 2323b, 23c, 23d are derived from the input terminal and the output side of each frequency divider 22a, 22b, 22c, and these output terminals 23a, 23b, 23c, 2
3d are sequentially connected to the first to fourth gate circuits 24a...24d, and the fifth to eighth gate circuits 24e...
・Connect to 24h in reverse order. The output terminals of the flip-flop circuits 9a, 9b, and 9c constituting the counting circuit 9 for counting the number of cycles are connected to the matrix circuit 25, and the first to eighth output terminals thereof have a time interval of one cycle. The rectangular waves are sequentially extracted as shown in FIG. 5A, b...h. These first to eighth output terminals 25
a...25h as the first to eighth gate circuits 24a.
. . 24h, and the output terminals of these first to eighth gate circuits 24a . . . 24h were connected in common and connected to the envelope gate circuit 26.

FIG. 6 shows a detailed circuit diagram of a part of the circuit shown in FIG. 1 (matrix circuit and gate circuit).

In the same figure, the matrices circuit 25 has a plurality of input lines connected to the output terminals Q and Q of each flip-flop circuit 9a, 9b, and 9c constituting the counting circuit 9, and one end connected to the output terminals 25a to 25h. , a plurality of output lines each having the other end connected to the negative power supply -B via a resistor, and a diode selectively connecting the input line and the output line. Further, each of the gate circuits 24a to 24h is composed of a plurality of diodes, and the input terminal SI thereof is connected to the frequency dividers 22a, 22b,
22c, the output terminal SO was connected to the envelope gate circuit 26, and the gate terminal G was connected to the output terminals 25a to 25h of the matrix circuit 25, as shown. The envelope gate circuit 26 forms an envelope of the piano sound at intervals of the clock pulses of the clock pulse generator 18, as shown in FIG. 5, 1, j, for example, and opens a circuit in this envelope. Now, press the C, E, and G keys to convert the sound source signal to C.
4, E4, G4 The signal obtained by dividing this into 1/2 is C3, E
3, G3, the signal frequency-divided to 1/4 is C2, E2, G2,
The signals frequency-divided by 1/8 are denoted as C, , El, and Gl, and the process up to obtaining an arpeggio will be explained below.

Thus, in the positive first cycle described above, when the C signal is obtained on the line, this source signal is passed through the frequency dividers 22a, 22b,
At 22c, the frequency is reduced to 1/8 and the signal C is applied to the first gate circuit 24a.At the same time, the input signal of the first circulation is applied to the counting circuit 9 and is obtained at the first output terminal of the matrix circuit 25. One sequential pulse is added to it. Thus, the first gate circuit 24a is opened, and the C signal passes through, and the envelope gate circuit 26 forms a piano envelope as shown in FIG. You will get an octave C1 note. Subsequently, the EG signal is similarly reduced to 1/8 the frequency and becomes the El, G signal, which is sent to the first gate circuit 2.
4a and an envelope gate circuit 26, an envelope is formed and an octave of El is output from the speaker.
,G, sound is obtained. Thus, when the positive first cycle ends and the second cycle begins, the second sequential pulse is applied to the second gate circuit 24b.
while the second frequency divider 2 is applied to the gate circuit 24b.
C2, E2, and G2 sounds whose frequency is divided by 1/4 are obtained from 2b. Next, when entering the third circulation, the third gate circuit 24c is opened and the C3, E3, G3 signals whose frequency has been divided into 1/2 pass through to obtain the three-point octave C3, E, , G, tones. is,
Furthermore, when entering the fourth circulation, the C4, E4, and G4 signals pass through the fourth gate circuit 2424d and are outputted to the four-point octave C, , E.
l, G, and sounds are obtained sequentially. When the next cycle enters the reverse cycle, the fifth
While the fifth gate circuit 24e is opened by the pulse, G, E
Since the signals are generated in the order of , C, a four-point octave of G4, E4, and C4 tones is obtained.

In this way, the sixth, seventh, and eighth gate circuits 24 are sequentially
f, 24g, 24h are opened and three points, two points, one point G
3, E3, C3 G2, E2, C2, G,, El, Cl sounds are obtained. Next, when each key is released, each key switch 1-1, 1-5, 1-8 is opened, the clock pulse generator 18 and the counting circuit 9 are set, and the automatic performance of the arpeggio is stopped.

The above describes the case where a four-point octave is obtained from a one-point octave in the order of C, E, and G notes, and then a one-point octave is obtained from a four-point octave in the order of G, E, and C notes. The eighth gate circuits/circuits 24a...24h are each configured with two gate circuits, and the changeover switch 27 is
By switching from -DOWN to DOWN-UP, it is possible to perform from a four-point octave to a one-point octave, and from a one-point octave to a four-point octave.

In addition, the above describes 12 bistable multivibrators 3-1.
...I set up 3-12 and tried to circulate it, but
By further increasing the number of key switches, or by keeping the number at 12 and connecting other key switches in parallel, so-called link wiring, the same effect can be achieved when pressing any key in any octave on the keyboard. It is possible to obtain an arpeggio, and when performing this link wiring, the number of bistable multivibrators is small and the cost is low. Although the clock pulse generator 18 is not shown, it is provided with a variable adjuster for varying its pulse width, and by adjusting it, it can be made to correspond to rhythm, etc.

Further, the clock pulse generator 18 can be used in an electronic musical instrument equipped with an automatic rhythm generator, and in this case, an arpeggio synchronized with the rhythm can be automatically obtained. In this way, according to the present invention, the sound source signal obtained by circulating the forward circulation circuit multiple times and then circulating the reverse circulation circuit multiple times by pressing the key switch is frequency-divided. Since the gate circuits are opened sequentially during each forward or reverse cycle, an arpeggio sound can be obtained automatically, and the number of parts is reduced and the cost is lower than that of conventional products. It has the following effects.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention; FIG. 1 is an overall block diagram, FIG. 2 is a detailed circuit diagram of a part of it, and FIG. 3 is a time chart explaining the operation of a part of it. FIG. 4 shows an overall time chart, FIG. 5 shows a detailed time chart of a part thereof, and FIG. 6 shows a detailed circuit diagram of a part of the circuit shown in FIG. 1 (matrix circuit and gate circuit). 1-1, 1-12... Key switch, 2-1,
2-12...Sound source gate circuit, 3-1,3-
12... Bistable multivibrator, 4-1,
4-12...Gate circuit for positive circulation, 6-1,
6-12...Gate circuit for reverse circulation, 5...
...Forward circulation circuit, 6...Reverse circulation circuit, 9...
...Counting circuit, 9a, 9b, 9c...Flip-flop circuit, 22a, 22b, 22c...
Frequency divider, 24a, 24h...Gate circuit, 25
...Matrix circuit.

Claims (1)

[Claims] 1. When the key switch is activated, the input pulse to the input terminal is inverted to open the sound source gate circuit and allow the passage of the sound source signal, and a clock pulse generator generates a clock a predetermined time after the key switch is activated. The signal is reversed again by the pulse, and the sound source gate circuit is closed to prevent the sound source signal from passing through, and an output pulse is generated at the output terminal. A plurality of bistable multivibrator circuits configured to generate output pulses are connected in series to their output terminals via a positive circulation gate circuit, and the output terminal of the final stage positive circulation gate circuit is connected to the output terminal of the bistable multivibrator circuit. Connect to the input terminal of the bistable multivibrator circuit in the previous stage to form a forward circulation circuit, and connect a reverse circulation gate circuit in parallel to each bistable multivibrator circuit and the forward circulation gate circuit on its input side. Then, connect the output terminal of the bistable multivibrator circuit in the first stage to the input side of the reverse circulation gate circuit in the last stage to form a reverse circulation circuit, and count the number of cycles between the forward circulation circuit and the reverse circulation circuit. A counting circuit is provided, and upon completion of counting in one of the predetermined circulation circuits, the other circuit is made to circulate, and the sound source signal passing through each of the sound source gate circuits is divided into multiple stages by a frequency divider. On the other hand, the outputs of the multi-stage flip-flop circuits constituting the counting circuit are passed through a matrix circuit to sequentially obtain pulses at each output terminal, and these sequential pulses are connected to each output terminal of the frequency divider. An automatic arpegillo device for an electronic musical instrument, characterized in that an arpeggio signal is obtained by successively opening gate circuits.