JPH04141694A - Tempo controller - Google Patents

Abstract

PURPOSE:To suppress the unnatural tempo change at the time of the excessive tap interval change by setting the tempo change range in accordance with the strength with which a tap switch is operated. CONSTITUTION:The tempo change is performed in accordance with intervals of operation of a tap switch (a) by a tempo control means (b). In this case, the tempo change range corresponding to the strength with which the tap switch (a) is operated is set by a tempo change range setting means (d). That is, the upper limit value and the lower limit value of the tempo change range are set in accordance with the strength of the tap. Thus, a tempo controller is obtained which naturally suppresses the unnatural tempo change even in the case of the excessive tap interval change.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a tempo controller suitable for use in automatic performance devices, rhythm machines, etc., for example.

"Prior Art" Rhythm machines that automatically play various rhythms such as waltz, jazz, and rock are widely used either alone or incorporated into automatic performance devices. By the way, setting the tempo of rhythm performance on a rhythm machine is
Generally, a volume is used to set the tempo, but changing the tempo in the middle of a song is unnatural, and
It was difficult. That is, there are problems in that the act of operating the volume is not familiar to the performance, and it is difficult to judge how much the volume should be operated to set the desired tempo.

Therefore, in order to make it possible to set the tempo at intervals, tempo controllers have been developed that set and change the tempo by detecting the interval at which a tap switch or the like is tapped (for example, Kaisho 61-4699
No. 3).

``Problem to be Solved by the Invention'' However, in conventional devices that allow tempo changes by tapping, performers may accidentally make the tempo change louder than necessary.
If you tap at small intervals, the tempo of the performance changes unnaturally. In this case, it is conceivable to set certain restrictions on tap changes, but if such restrictions are applied, the problem arises that it becomes unnatural.

The present invention has been made in view of the above-mentioned circumstances, and provides a tempo controller that can suppress unnatural tempo changes even when there is an excessive tap interval change, and that the suppression does not become unnatural. The purpose is to

"Means for Solving the Problems" In order to solve the above problems, the present invention provides a tap switch a that is operated to take the beat, and an interval at which the tap switch a is operated, as shown in FIG. The tempo control means changes the tempo of the automatic performance based on the tap strength detection means C that detects the strength with which the tap switch a is operated, and the tap strength detection means C that detects the strength with which the tap switch a is operated. tempo change range control means d for setting an upper limit value and a lower limit value for tempo change based on the tempo change, and limiting the range of tempo change in the tempo control means according to these values. .

"Operation" The tempo is changed by the tempo control means according to the interval at which the tap switch a is operated. At this time, the tempo change range setting means d sets a tempo change range according to the strength with which the tap switch a is operated. That is, the upper and lower limits of the tempo change range are set depending on the strength of the tap.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, 1 is a CPU that controls each part of the device, and 2 is a memory in which programs used by the CPUI are stored. A keyboard 3 outputs on/off information of operated keys and keystroke speed information.

4 is an operation unit for issuing various instructions to the CPUI, and 5 is a tap switch interface. As shown in FIG. 3, the tap switch interface 5 is connected to an A/D converter 10. Comparison section 11 and latch 12
It is made up of. The A/D converter 10 converts the signal output from the pressure sensor 16 of the tap switch 15 into a digital signal (pressure data). This pressure data is output to the CPUI via the latch 12.

The comparator 11 compares the pressure data with a predetermined value Te, and outputs tap timing data as an interrupt signal to the CPUI when the pressure data exceeds the predetermined value Te.

Reference numeral 6 in FIG. 2 is a sound source circuit in which various sound sources such as stringed instruments and percussion instruments are stored, and these sound sources are activated in response to the performance on the keyboard 3 or programmed automatic performance to generate musical sound signals. The signal is supplied to the sound system 7 as a signal. In the sound system 7, the supplied musical tone signal is amplified and output from a speaker.

Next, the operation of this embodiment will be explained. First, the CPU performs automatic performance using the sound source in the sound source circuit 6 in accordance with the automatic performance program selected in response to the operation of the operation section 4. The initial tempo in this automatic performance is determined by tempo data set by the operation section. In other words, the CPU uses a tempo clock (
The tempo of automatic performance is controlled based on the path shown in the figure) and tempo data.

Next, when the tap switch 15 shown in FIG. 3 is tapped by the operator, an interrupt signal is output from the comparator 11 to the CPU 1, and the process shown in FIG. 4 is started.

First, tap information is captured in step SPI, and tap timing is detected in step SP2. Then, in step SP3, a new tempo is calculated based on the tempo estimation module.

This process is a process of determining a new tempo interval based on the detected tap timing, and for example, the tempo TMP- is calculated using the following procedure.

(1) Estimate which beat point time on the musical score the current tap operation corresponds to. Here, the time on the musical score is expressed by the number of tempo clocks from the start of automatic performance.

(2) Subtract the strong beat time on the score estimated by the previous tap operation from the strong beat time on the score estimated in (1) above to find the score time that has progressed at the tap interval.

(3) The musical score time obtained in (2) above is divided by the actual time during that time to obtain the tempo TMP-. Next, a new tempo T new is obtained by mixing this tempo TMP- and the previous tempo T old. In this mixing, for example, the ratio of TMP- to the previous tempo Tofd is 6:4. This process of step SP3 is performed to make the tempo change smooth.

Next, in step SP4, the new tempo T n
The difference T dif between ew and the previous tempo T old is determined. Then, it is determined whether the difference T dif is between the preset upper limit T difmax and lower limit T difmin (step SP5.5P6),
If rYESJ, the process proceeds to step SP7, and the sum of Told and T dif (Tnevj in this case) is output as output data Tout. As a result, the tempo of automatic performance is changed. Also, if "NO" is selected in step SP5,
In this case, the difference T dif is the upper limit T dif + oa
If the answer is "NO" in step SP6, the difference T dif is replaced with the lower limit value T difmin. Then, step SP8 or step SP
After the replacement processing in step 9, the process proceeds to step SP7. Therefore, the output data T out is the previous tempo To1.
Upper limit value T dif + oax or lower limit value T difw for d
This is the value to which in (sign is negative) is added.

On the other hand, in the process shown in FIG.
The process of P9 and the processes of steps 5PIO to 5PI2 are performed in parallel, so that when a tap is made, its strength is detected in step 5PIO. The tap strength is detected based on pressure data output from the latch 12 shown in FIG. and,
In steps SPI 1 and 5P12, the upper limit value Tdifmax and the lower limit value Td are determined according to the tap strength.
Ifmin is rewritten respectively. This rewriting is performed, for example, according to the function shown in FIG. That is,
The upper limit value Td i fmax is changed so that it increases linearly according to the strength of the tap, and the lower limit value Tdifmin is changed so that it decreases linearly (the absolute value increases) according to the strength of the tap. . Note that any function used for rewriting can be set.

Upper limit value T difmax and lower limit value T difmin rewritten in steps 5P11 and 5P12
are each performed in step SP5. SP8 and SF3゜SF3
Each is used in Therefore, judgment (SF3, 5P6) and rewriting (SF3.8
P9) is performed based on an upper limit value and a lower limit value depending on the strength of the tap.

"Effects of the Invention" As explained above, according to the present invention, the tempo change range is set according to the strength with which the tap switch is operated, so even if there is an excessive tap interval change, it will not be unnatural. The tempo change can be suppressed, and the effect that the suppression does not become unnatural can be achieved.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing the configuration of this invention, FIG. 2 is a block diagram showing the configuration of one embodiment of this invention, and FIG. 3 is a tap switch interface 5 in the same embodiment.
FIG. 4 is a flowchart showing the operation of the embodiment, and FIG. 5 is a diagram showing functions for calculating the upper and lower limits of tempo change in the embodiment. 1...CPU (tempo control means, tempo change range control means), 15...Tap switch, 1
6...Pressure sensor (tap strength detection means).

Claims (1)

[Scope of Claims] A tap switch that is operated to keep the beat; tempo control means that changes the tempo of automatic performance based on the interval at which the tap switch is operated; and the strength with which the tap switch is operated. a tap strength detection means for detecting; and setting an upper limit value and a lower limit value for tempo change based on the tap strength detected by the tap strength detection means;
A tempo controller comprising: tempo change range control means for limiting the range of tempo change in the tempo control means according to these values.