JPS634194B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic arpeggio device, and more particularly to an automatic arpeggio device that adds a predetermined count value from a rhythm counter to an octave signal from a key press detection circuit in synchronization with the count value, so that, for example, an arpeggio tone is added every 32 notes. This relates to an automatic arpeggio device that outputs an octave and raises the octave for each quarter note.

Conventionally, as a method for automatically obtaining arpeggio sounds, the present applicant has disclosed Japanese Patent Application Laid-Open Nos. 51-78316 and 1973
-118412, JP-A-101013, etc. have been proposed, but in both cases the wiring work is complicated due to the large number of gate circuits and the large number of wires, which causes problems in reliability. Consideration must also be given to noise. Furthermore, the structure is not suitable for integrated circuits, and this results in impeding improvements in reliability and miniaturization of circuits.

In response to this, the present applicant has proposed a pattern performance device in Japanese Patent Application No. 52-6939, which uses a simple circuit including a counter to produce high-quality arpeggio sounds over multiple octaves by pressing a key switch. was completed.

Figure 1 shows an example of this proposal. To explain the outline, the clock from the high-speed clock generator 1 passes through the AND circuit 9, enters the hexadecimal counter 2, and is counted.The resulting value enters the 12-line decoder 3, and is output to one of the output terminals. issue. The output of this line decoder 3 is transmitted to each key switch 5a to 5l, 5m of the accompaniment keyboard.
They are connected in parallel to correspond to each tone of the ~5u octave. In the figure, 2 octaves 5a-5l are C~
B, 5m to 5u are shown corresponding to C _H to B _H , respectively. In this way, the key switch contact 5a
5u is connected to the output terminal of the line decoder 3, and the other is connected to the OR circuit 6, the output of which is sent to the reset terminal of the latch circuit 7 and flip-flop (FF) 8. When "1" is output to the output terminal of the line decoder 3 corresponding to the key switch pressed in this way, this signal is OR
A latch signal is sent to the latch circuit 7 through the circuit 6 to store and hold the output of the counter 2 at this time, and also inverts the FF 8 to the reset state and closes the AND circuit 9. Therefore, the high-speed clock stops at 1 o'clock,
A binary signal corresponding to the pressed key switch is taken out from the output terminal as a pitch name designation signal.

Thereafter, the counter 2 continues to stop counting until a rhythm pulse is input from the terminal 10 and FF8 is set. When a rhythm pulse is received and FF8 is set, the counter 2 starts counting again and searches for the next pressed key switch. When the hexadecimal counter 2 counts 12 in this way using the high speed clock and rhythm pulse, the output value of the quaternary counter 4 increases by one, indicating that the octave has gone up by one. That is, the quaternary counter 4 outputs numerical values from "00" to "11" to specify the octave. With this configuration, arpeggio sounds spanning several octaves can be obtained with a simple circuit, and a wide variety of patterns can also be obtained. Furthermore, since it is processed as a binary signal, it is suitable for integrated circuits, and since the musical tone signal is obtained as a binary signal, there is no need for many gate circuits and the number of wires is reduced, making it possible to create an automatic arpeggio. We were able to eliminate the shortcomings of the device.

Normally, a rhythm pulse is divided into 32 sections, with each 32nd note being struck in a pattern, and each quarter note being one beat.

According to the above-mentioned patent application No. 52-6939, terminals 10 to 32
Every time a diacritic rhythm pulse is input, a 12-line decoder is activated by a high-speed clock to search for the pressed key switch. Then, the 12-line scan is repeated in sequence, and then the octave is ascended. With this configuration, an arpeggio sound is generated every 32nd note of the rhythm, but the timing at which the octave rises varies depending on the number of keys pressed. Furthermore, even if three keys are pressed, the octave rises every three rhythm pulses, but there is a drawback that the music is unnatural because it is not synchronized with the beat or bar.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic arpeggio device that increases the octave of an arpeggio sound in synchronization with a beat or the like.

In order to achieve the above object, the automatic arpeggio device of the present invention includes a rhythm counter that counts rhythm pulses from a rhythm pulse oscillator and reads out a rhythm pattern stored in a memory circuit, and a key switch that corresponds to a pressed key according to the rhythm pulses. key press detection means scans with a pulse synchronized with the count value of the rhythm counter and outputs an octave signal and a note name signal in synchronization with the count value of the rhythm counter; means for adding a counted value; a sound source for outputting a musical tone based on the added octave signal and the note name signal from the key press detection means; and opening and closing of the musical tone output from the sound source with pulses synchronized with the rhythm counter. The invention is characterized by comprising a gate circuit.

The present invention will now be described in detail with reference to examples.

FIG. 2 is an explanatory diagram showing the configuration of an embodiment of the present invention.

In this embodiment, several of the eight 32nd notes corresponding to one beat output one octave, and the octave is sequentially increased for each beat.

In the figure, pulses from a rhythm pulse oscillator 11 are counted by a rhythm counter 12,
The counted values of 32nd notes, bars, and beats are sent to the rhythm pattern storage circuit 13, the corresponding rhythm pattern is read out, and the rhythm sound is emitted from the rhythm sound source 14 through the amplifier 15 and the speaker 16. This configuration is the same as that of a normal rhythm generator.

Next, a key switch pressed on the keyboard 17 is scanned by a key press detection circuit 18 to detect a key press. A pulse synchronized with the 32nd note from the rhythm counter 12 is input, and the detection circuit 18 sequentially outputs a key press signal consisting of 2 bits for an octave and 4 bits for a note name, and stores them in the latch circuit 19. The octave signal has a count value corresponding to the beat from the rhythm counter 12 added thereto by an adder 20, and is output to the sound source 21 together with the pitch name signal. The musical tone signal from the sound source 21 is synchronized with the 32nd note from the rhythm counter 12 by the gate circuit 22 and output.

Now, add the note names C, E, G, B ^b (C ₇ chord)
Considering the case, the first beat count value outputs (0, 0). The key press signal is the lowest octave (00) to the highest octave (11), and C to B are assigned from (0000) to (1011). C, E, G,
If you press B ^b in the lowest octave, then C
(000000), E (000100), G (000111), B ^b
A key press signal (001010) is output from the key press detection circuit 18 in synchronization with the pulse of the rhythm counter 12 corresponding to the 32nd note. This key press signal is added to the beat count value (00) and then output to the sound source 21.
The sounds of CEGB ^b are output sequentially.

Next, on the second beat, the beat count value becomes (01), and 1
CEGB ^b , an octave higher, is pronounced. 3rd beat,
The octave increases in the same way on the fourth beat.
Also, in this example, I pressed the lowest octave key,
If you press a key in any octave, the octave will ascend sequentially from that octave.

FIG. 3 shows a specific circuit example of the key press detection circuit which is the main part of the embodiment shown in FIG.

In the figure, a quaternary counter 32 representing an octave and a decimal counter 31 representing a pitch name are driven by a clock from a clock oscillator (OSC) 30 under the control of AND circuits 40 and 41, which will be described later. The 4-bit pitch name signal from the hexadecimal counter 31 and the 4-bit octave signal obtained by converting the 2-bit signal from the quaternary counter 32 by the 2-4 decoder 33 are respectively sent to the 4-12 decoder 34 _{1 .
344} , and the 12-bit output of each decoder is input to key switches ₃₅₁ to ₃₅₄ to perform scanning. The key press signal resulting from the scanning is inputted to the latch circuit 19 shown in FIG. 2 via the OR circuit 36, and the outputs of the hexadecimal counter 31 and the quaternary counter 32 are used as latch signals to hold the octave signal and the pitch name signal. , are output to the adder 20 and the sound source 21, respectively.

On the other hand, at the beginning of the first beat of the rhythm, a pulse synchronized with the half note from the rhythm counter 12 shown in FIG.
A high level signal is output from the Q output (marked with *) of 8 and is input to one side of the AND circuit 40 which controls the clock of the clock oscillator 30 mentioned above. A high level signal from a terminal of a flip-flop (FF) 39, which is set by a pulse synchronized with the beat number of the rhythm counter 12, is input to the other side of the AND circuit 40. In this case, the FF 39 is reset by the output of the differentiating circuit 44 which inputs a pulse synchronized with the number of beats of the rhythm counter, and at the same time the decimal counter 31 and the quaternary counter 32 are reset. And the high level output of the AND circuit 40 is the AND circuit 4
1, the hexadecimal counter 31 and the quaternary counter 32 start counting and sequentially scan the key switches.

In the above configuration, when a key is pressed, OR circuit 3
A pulse is output at 6, and the latch circuit 19 latches the octave signal and note name signal from the hexadecimal counter 31 and the quaternary counter 32 corresponding to the key press signal at that time. This pulse is also output to the reset (R) terminal of FF38, AND circuit 40, AND
The circuit 41 is made to fail. Then, each time a pulse corresponding to a 32nd note synchronized with the rhythm from the rhythm counter 12 is input to the differentiating circuit 37, a key press signal is sequentially detected and latched. key switch 35
When a pulse is output from the highest note of ₄ , it is output to the set terminal of FF39, making AND circuit 40 and AND circuit 41 fail, and the key press detection circuit is inactive until a pulse synchronized with the next beat is output. state. The same procedure is repeated every time a pulse synchronized with the beat rate is input.

In this embodiment, the octave signal is raised every beat of the rhythm counter, but it may be raised every bar.

As explained above, according to the present invention, a predetermined count value from a rhythm counter is added to an octave signal from a key press detection circuit in synchronization with the count value,
For example, an arpeggio sound is output every 32nd note, and the octave rises every quarter note. In this way, one beat or one rhythm note
Since the octave of the arpeggio sound rises in synchronization with the measures, it can provide an extremely pleasant musical feel.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventionally proposed example, FIG. 2 is an explanatory diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a specific circuit example of the main part of the embodiment of FIG. 11 is a rhythm pulse oscillator, 12 is a rhythm counter, 1
3 is a rhythm pattern storage circuit, 14 is a rhythm sound source, 15 is an amplifier, 16 is a speaker, 17 is a keyboard, 18 is a key depression detection circuit, 19 is a latch circuit, 2
0 is an adder, 21 is a sound source, and 22 is a gate circuit.

Claims (1)

[Scope of Claims] 1. A rhythm counter 12 that counts rhythm pulses from a rhythm pulse oscillator 11 and reads out a rhythm pattern stored in a memory circuit 13; a pulse that synchronizes a key switch corresponding to a pressed key with the rhythm pulse; key press detection means 18 which scans the rhythm counter 12 and outputs an octave signal and a note name signal in synchronization with the count value of the rhythm counter 12;
means 20 for adding a predetermined count value of the rhythm counter 12; a sound source 21 for outputting a musical tone based on the added octave signal and the note name signal from the key press detection means 18; a musical tone output from the sound source 21; a gate circuit 2 that opens and closes with pulses synchronized with the rhythm counter;
2. An automatic arpeggio device comprising: