JPH10133662A - Electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain proper sound volume and generate a proper timbre even when a variable resistor is turned down by providing a variable resistor position detecting means and a control means which controls the dynamic range or frequency characteristics of a musical sound signal based upon touch information according to the output information of the detecting means. SOLUTION: A master variable resistor 14 for position input is a variable resistor which is interlocked with a master variable resistor 11 and applied with a given DV voltage. Therefore, a voltage corresponding to the position of the operation knob of the master variable resistor 11 is outputted from the master variable resistor 14 for position input. An A/D converter 15 converts the voltage outputted from the master variable resistor 14 for position input from analog to digital according to an instruction of a CPU 1. Then when the master variable resistor 11 is turned down and sound volume is small, the dynamic range based upon touch information is made small, or proper sound volume can be obtained and a proper timbre can be obtained even at the time of weak hitting by controlling the frequency characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument, and more particularly, to control of a dynamic range or the like according to a volume of an electronic musical instrument.

[0002]

2. Description of the Related Art In a conventional electronic musical instrument such as an electronic piano, when the master volume is maximized, it is set so that a considerably large volume can be produced as compared with an acoustic musical instrument. In addition, when used in a normal home, the position of the master volume is often less than half of the maximum value, while when used on a stage or the like, it is often close to the maximum value. However, no matter what volume is used, the dynamic range based on the change in velocity, which is the touch information, and the degree of timbre change are fixed, and are not controlled by the volume.

[0003]

In the above-described conventional electronic musical instrument, the dynamic range is set so that the same volume is produced when the user plays with the same touch as the corresponding acoustic musical instrument. In such an electronic musical instrument, if the master volume is turned down so that it is not noisy when hitting at home, the sound becomes too low when hitting weakly, and the sound played with a weak touch can hardly be heard,
If the master volume is adjusted so that the sound is just right with a weak touch, there is a problem that a loud sound will produce too much sound when hit hard. Further, when the volume is low, the bass sound is hard to be heard, so that there is also a problem that the sound sounds slightly thin.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to control a dynamic range or the like based on touch information by a sound volume, so that an electronic musical instrument capable of generating an appropriate sound volume even when the volume is reduced. Is to provide.

[0005]

According to the present invention, in an electronic musical instrument, a volume position detecting means for detecting an operation position of a volume, and a dynamic range of a tone signal based on touch information based on output information of the volume position detecting means. Alternatively, a control means for controlling frequency characteristics is provided. Further, based on the output of the volume position detection means, when the volume position is set to a large volume, the control means has a large dynamic range of the volume of the musical tone signal that changes according to the touch information, and the volume position has a small volume. When set, the tone generation parameter is calculated so that the dynamic range is reduced.

Further, when the value of the master volume is small, the control means determines that the upper limit of the dynamic range changed by the touch information is equal to or less than the upper limit of the volume in the home.
Another feature is that the parameters are calculated such that the lower limit is equal to or higher than the lower limit of the volume in the home.

In the electronic musical instrument according to the present invention, when the master volume is reduced and the volume is low, the dynamic range based on the touch information is reduced, or the frequency characteristic is controlled. Even at the time of hitting, a tone can be generated with an appropriate volume and tone.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an electronic piano to which the present invention is applied. CPU1
Is a central processing unit that controls the entire electronic piano based on a control program stored in the ROM 2.
The CPU 1 is also provided with a hardware timer interrupt circuit. The ROM 2 has a control program, timbre data,
A frequency table and the like are stored. The timbre data includes tone waveform address information and envelope control parameter information stored in the waveform memory.

The RAM 3 is used as a work area and a buffer, and also stores panel setting data and the like. Further, it may be backed up by a battery or the like.
The keyboard circuit 4 scans, for example, a keyboard composed of a plurality of keys each having two switches for each key, and the state of the switch of each key, and detects a change in the state to generate key event information and touch information. And CPU1
And a keyboard interface circuit for notifying the user.
The panel circuit 5 includes various switches provided on the panel for selecting a tone color, a display device for displaying characters and the like by liquid crystal or LED, a panel interface circuit, and the like.

[0010] The DCO 6 outputs C
Based on the tone generation parameters assigned by the PU 1, waveform data is sequentially read from the waveform memory 7 in which digital tone waveform sample values are stored at address intervals in proportion to the pitch to be emitted, and interpolation is performed to obtain a tone waveform signal. It is a circuit to generate.

The envelope generator 8 controls each DCO based on an envelope parameter set by the CPU 1.
The multiplier 9 multiplies the envelope signal generated from the envelope generator 8 by the tone waveform signal output from the DCO to output a tone signal. Electronic musical instruments usually have a plurality (for example, 3
Although it has the tone generation channel of 2), a plurality of tone signals can be simultaneously and independently generated simultaneously by actually performing a time division multiplex operation of one DCO circuit.

The D / A converter 10 converts the digital tone signal into an analog signal, and the tone signal whose volume level is adjusted by the master volume 11 is amplified by the amplifier 12 and is emitted from the speaker 13. The position input master volume 14 is a variable resistor that works in conjunction with the master volume 11, and has a predetermined DC voltage applied thereto. Therefore, the position input master volume 14 outputs a voltage corresponding to the position of the operation knob of the master volume.

An A / D converter 15 A / D converts the voltage output from the position input master volume 14 based on an instruction from the CPU 1. The bus 16 connects each circuit in the electronic piano. Note that a MIDI interface circuit, a memory card interface circuit, a floppy disk device, and the like may be provided as necessary.

FIG. 2 is an explanatory diagram showing the contents of the tone generation control parameters corresponding to each tone color in the present invention. The parameter group 20 exists, for example, for each tone and each tone range, and stores various parameters for determining the tone (waveform), volume, envelope, and the like. The DCA velocity depth 21 is a parameter that determines how much the envelope size, that is, the volume, is changed according to the change in the velocity value that is the touch information. The DCF velocity depth 22 is a parameter that determines how much the cutoff frequency of the filter is changed, for example, according to a change in the velocity value.

The master volume to DCA velocity depth 23 is a parameter for determining how much a change in the master volume value affects the DCA velocity depth. The master volume to DCF velocity depth 24 is a parameter that determines how much the change in the master volume value is DCF. This is a parameter that determines whether to affect velocity depth.

The input master volume value is MV, and the master volume toDCA velocity depth 23 is M
Assuming that TD, Velocity value is VEL, DCA velocity depth 21 is DVD, and volume parameter is VOL, the parameter P that actually determines the volume is calculated by the following equation.

[0017]

(Equation 1) The range that each parameter of DVD, MV, and MTD can take is 1 to 127, and the range that VEL can take is 0 to 127.
127. Therefore, the value of the DCA velocity depth DVD changes depending on the magnitude of the master volume value MV, and the dynamic range changes.

FIG. 4 is a graph showing the relationship between the velocity value and the sound power according to the present invention. In FIG. 4, a straight line 32 indicates a characteristic when the master volume is set to the maximum, and the inclination of the straight line 32 determined by the velocity depth parameter is set to match, for example, the characteristics of an actual piano. .

In the conventional electronic musical instrument, when the master volume is reduced from the maximum position, the characteristics change so that the straight line 32 moves downward with the same inclination. Therefore, for example, when used in a home, if the master volume is adjusted so that the sound power at the maximum velocity becomes the upper limit of the volume in the home, the characteristic shown by the straight line 30 in FIG. 4 is obtained. However, in this case, there is a problem that the sound power of the portion having a low velocity is lower than the lower limit value of the volume in the home, and it is difficult to hear the soft hit.

In the present invention, when the master volume is reduced, the degree of the reduction is detected, and the velocity depth parameter is controlled based on the detection result. Slow the slope of the straight line to make it easier to get power when hitting lightly. Therefore,
Even when used in the home as described above, if the master volume is adjusted so that the power at the time of the hard hit is the upper limit of the volume of the home, the power at the time of the light hit is just at the lower limit of the home volume. It can be set to be as follows.

FIG. 3 is a flowchart showing the main processing of the CPU 1 of the electronic piano of FIG. 1 according to the embodiment of the present invention. When the power is turned on, in step S1, the data setting states of the RAM 3, DCO 6, and the envelope generator 8 in the apparatus are returned to the initial state. In step S2, the master volume value is acquired using the A / D converter 15. In step S3, the acquired master volume value is converted into a desired characteristic by using a conversion table.

In step S4, the DCA velocity depth parameter is corrected based on the acquired and converted master volume value. In step S5,
It is determined whether a panel event, that is, a change in the state of a switch or other operation element on the panel is detected. If the result is affirmative, the process shifts to step S6 to execute a known panel process.

In step S7, the keyboard circuit 4
And fetches the event information from, and determines whether or not a key event has occurred. If the result of the determination is negative, the process proceeds to step S13, where other known processes such as a MIDI process and an automatic performance process are performed, and the process returns to step S2. However, if the determination result of step S7 is affirmative, that is, if a key event has occurred, the process proceeds to step S8.

In step S8, it is determined whether or not the key event is key-on. If the result is negative,
That is, if the key event is key-off, the flow shifts to step S12 to perform a well-known key-off process (attenuating a tone signal and releasing a channel). However, when the determination result is affirmative, the process proceeds to step S9. In step S9, a well-known channel assignment (key assignment) process is performed, and an empty DCO (channel) to be assigned for key-on is selected.

In step S10, based on the velocity value and the velocity depth value as touch information,
Parameters set in the envelope generator 8 are calculated. In step S11, the DCO corresponding to the channel selected in step S9, and various parameters based on key-on information and timbre information are set in the envelope generator, and the tone signal is set. Generation is started and step S
Go to step 13. With the above configuration and processing,
The dynamic range based on the velocity information can be controlled by the position of the master volume.

Although the embodiment has been described above, the following modified examples are also conceivable. In the embodiment, the example in which the volume is controlled by the position of the master volume is disclosed.
It is also possible to control the timbre by a similar method.
For example, depending on the position of the master volume, the DCF cutoff frequency parameter may be controlled, or in order to compensate for the characteristic that bass becomes difficult to hear when the volume is reduced, as the master volume is reduced, only the bass portion is enhanced. It is also possible to control the frequency characteristics as follows.

[0027]

As described above, in the present invention,
With a means for detecting the operation position of the master volume, the master volume is reduced, and when the volume is low, the dynamic range based on the velocity value is reduced, or by controlling the frequency characteristic of the filter, the weak hit Also, there is an effect that a musical tone can be generated with an appropriate volume or tone.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an electronic piano to which the present invention is applied.

FIG. 2 is an explanatory diagram showing the contents of tone generation control parameters corresponding to each tone color in the present invention.

FIG. 3 is a flowchart illustrating main processing of a CPU 1;

FIG. 4 is a graph showing the relationship between velocity value and sound power according to the present invention.

[Explanation of symbols]

1 CPU, 2 ROM, 3 RAM, 4 keyboard, 5 panel, 6 DCO, 7 waveform memory, 8 envelope generator, 9 multiplier, 10 D / A converter,
11 master volume, 12 amplifier, 13 speaker, 14 position input master volume, 15 A
/ D converter, 16 bus

Claims (3)

[Claims] 1. An electronic musical instrument, comprising: volume position detection means for detecting an operation position of a volume; and control means for controlling a dynamic range based on touch information of a tone signal based on output information of the volume position detection means. An electronic musical instrument characterized by that: 2. An electronic musical instrument, comprising: volume position detection means for detecting an operation position of a volume; and, based on an output of the volume position detection means, when a volume position is at a loud volume, a tone signal changed by touch information. Parameter calculating means for calculating a tone generation parameter so as to reduce the dynamic range when the dynamic range of the volume is large and the volume position is a small volume; and a tone signal generating section for generating a tone signal based on the parameter. Electronic musical instrument comprising: 3. The parameter calculating means, when the value of the master volume is small, the upper limit of the dynamic range changed by the touch information is equal to or less than the upper limit of the home volume, and the lower limit is equal to or higher than the lower limit of the home volume. The electronic musical instrument according to claim 1, wherein the parameter is calculated such that: