JPS62183496A - Automatic rhythm performer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field of invention J The present invention relates to an automatic rhythm performance device.

[Prior Art] Conventionally, the tempo of automatic rhythm performances of electronic musical instruments has been electronically controlled and accurate, and this has been considered ideal. That is, as shown in Figure 3, the tempo setting knob is set to 1! A constant voltage V is applied to the variable resistor 21 that performs AgjJ, and the variable usable divided voltage potential from the slider of the variable resistor 21 is converted into digital data by the A/D converter 22. The timer 23 counts the time according to the given tempo data, and
At each time count, a pulse signal is given to the address counter z4, the read address for the rhythm pattern memory 25 is incremented at a constant tempo, and the rhythm pattern data is sequentially read out from the rhythm pattern memory 25 at a constant speed. A rhythm sound signal is generated by the sound generation section 26 and the sound system 2
A plurality of rhythm patterns are stored in the rhythm pattern memory 25 marked with < and h, and the starting address of each pattern is set in the address counter 24 by the rhythm pattern selection section 28. , the above-mentioned increment starts from this first address.

[Problems with the Prior Art] By the way, when humans play rhythms on musical instruments, they do not actually perform the rhythms exactly according to all the intervals between notes indicated on the musical score, and the tempo of the rhythm performance may vary. There is a fluctuation in the rhythm performance, and a rhythm performance with this fluctuation is perceived as a rhythm performance with more musicality.

Research on such tempo fluctuations can be found in the Journal of the Acoustical Society of Japan, “Research on Quantification of Rhythm and Tempo Fluctuations J (VoJl, 40 No. 4 1984)
F228 to P234).

However, the tempo of the automatic rhythm performance in conventional '-[child basses' was constant, as if precisely matched to a metronome, and was therefore monotonous and far from the rhythm tempo of a natural musical instrument.

[Purpose of the Invention] This invention was made in view of the above-mentioned conventional problems, and its purpose is to provide a more humane and natural performance without monotony by giving fluctuations to the rhythm performance tempo. The aim is to provide an automatic rhythm playing device that is similar to musical instruments.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides a method to give fluctuation to the rhythm performance tempo by sequentially varying the set tempo data of the rhythm performance based on random number data from a random number generating means. The main points are as follows.

[Configuration of Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings.

Figure 1 shows the overall circuit of the automatic rhythm performance device.
In the figure, reference numeral 1 denotes a rhythm pattern memory, in which rhythm patterns such as rock and disco are stored. The rhythm pattern data read from the rhythm pattern memory l, whose read address is incremented from the first address, is transferred to the rhythm sound generation section 4 to generate a rhythm sound signal, and the sound system 5 outputs a sound. It will be output.

There is also a tempo variable resistor 6 that is linked to the tempo setting knob.
A constant potential ■ is applied to the variable tempo resistor 6, and the variable voltage divided potential from the slider of the variable tempo resistor 6 is converted into digital data by the A/D converter 7 and sent to the fluctuation calculation circuit 8.
On the other hand, a constant potential ■ is also applied to a fluctuation variable resistor 9 that is linked to a fluctuation setting knob that sets the degree of tempo fluctuation. The variable usable divided voltage potential from the slider is converted into digital data by the A/D converter 10 and sent to the fluctuation calculation circuit 8 as fluctuation level data b.
Furthermore, random number data C is sequentially generated from the random number generation circuit ll, and the fluctuation calculation circuit 8
will be given to.

In the fluctuation calculation circuit 8, f=a+b− for the basic tempo data a, fluctuation level data b, and random number data C.
c150(7) calculation is performed, and fluctuation is given to the basic tempo data a by adding or subtracting data obtained by enlarging the random number data C according to the fluctuation level data b to the basic tempo data a. The fluctuation tempo data f given this fluctuation is given to the timer 12, which performs a time count according to this fluctuation tempo data f, and at each time count, a pulse signal is returned to the address counter 3 and stored in the rhythm pattern memory. The read address for 1 is incremented at a fluctuating tempo, and the fluctuation is corrected in the tempo of the automatic rhythm performance.

[Operation of the embodiment] Next, the operation of this embodiment will be described.

Now, as shown in the upper part of Figure 2, the basic tempo data a is r.
150'', the respective knobs are set so that the fluctuation level data b becomes rOJ, and random number data C shown in the upper part of FIG. 2 is given to the fluctuation calculation circuit 8 for each volume. In this case, since the fluctuation level data b is "0", f=a+b@c150=a, and as shown on the upper right side of FIG. 2, the fluctuation tempo data f is always "150".
”, and no tempo fluctuation occurs.

On the other hand, as shown in the middle row of FIG. 2, only the fluctuation level data b is set to "10", and the random number data C shown in the middle row of FIG. 2 is sent to the fluctuation calculation circuit 8 for each volume. When the first beat is played, the random number data C of the first beat is "48", so f
=a+b@c150=150+10X48150=15
9 (rounded down to the nearest whole number), and the first beat is a little slower than the basic tempo. From then on, do the same A/
The fluctuation tempo data f is calculated in the D converter 10,
As shown on the right side of the middle row of FIG. 2, the fluctuation tempo data f fluctuates up and down by approximately "lO" centering on the basic tempo data r l 50J.

In this way, the automatic rhythm performance can be made more natural by adding fluctuations to the tempo.

Furthermore, as shown in the lower part of FIG. 2, when the fluctuation level data b is increased to "20" and the random number data C shown in the lower part of FIG. 2 is given to the fluctuation calculation circuit 8 for each volume,
Since the random number data C of the first beat is "39", f=a
+b*c150=150+20X39150=165
(rounded down to the nearest whole number), and the first beat will be slower than the basic tempo. Thereafter, the fluctuation calculation circuit 8 similarly calculates the fluctuation tempo data f, and as shown on the lower right side of FIG.
0” will fluctuate.

In this way, the degree of tempo fluctuation can be set arbitrarily.

In this embodiment, since the degree of tempo fluctuation can be changed by the fluctuation variable resistor 9, the automatic rhythm performance can be greatly changed by increasing or decreasing the degree of fluctuation.

Note that the fluctuation variable resistor 9 and the A/D converter 10 may be omitted, and the degree of fluctuation may be made constant.

[Effects of the Invention] As described in detail above, the present invention provides fluctuations to the rhythm performance tempo by sequentially varying the set tempo data based on the random number data from the random number generating means. Effects such as being able to obtain an automatic rhythm playing device that is more human-like and closer to a natural instrument, with fluctuations in the rhythm performance tempo and no mournful tone, just like when humans normally play musical instruments. play.

[Brief explanation of drawings]

FIG. 1 is an overall circuit diagram of an automatic rhythm performance device, FIG. 2 is a diagram showing an example in which the tempo is varied, and FIG. 3 is an overall circuit diagram of a conventional example. ■・・・・・・Rhythm pattern memory, 3・・・・・・
Address counter, 4...Rhythm sound generation section, 5
...Sound system, 6...Tempo variable resistor, 8...Fluctuation calculation circuit, 11...
...Random number generation circuit, 12...Timer. Patent Applicant Casio Computer Co., Ltd. Agent Patent Attorney Machi 1) Shun Seigane Body Mouth Mark 1 Ryu = 舅Go 2

Claims (1)

[Scope of Claims] Rhythm sound information storage means for storing rhythm sound information; reading means for reading out rhythm sound information from the rhythm sound information storage means; An automatic rhythm performance device comprising: a rhythm sound generation/sound emitting means for generating and emitting sounds; a tempo setting means for determining the reading speed of the reading means and setting the tempo of the automatic rhythm performance; and a tempo setting means for generating a random number. It is characterized by comprising a random number generating means, and a fluctuation calculating means for performing a fluctuation calculation on the tempo data from the tempo setting means to fluctuate the rhythm performance tempo based on the random number data from the random number generating means. Automatic rhythm playing device.