JP2016071036A - Volume control device and volume control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a volume control device that performs volume control so as to prevent a sudden change in volume in an electric musical instrument even when a failure occurs in an operator.SOLUTION: The device has a plurality of operators including volume control and adjusts parameters corresponding to the operators with an AD value obtained by analog/digital (AD) conversion of an amount of operation (a physical input) of each of the operators. The device comprises: an AD value storage unit 5 that stores the AD value; a change amount detection unit 4 that detects an amount of change of the AD value; and a volume controlling unit 6 that implements volume control in such a manner that when the amount of change of an AD value relating to the volume control exceeds a predetermined value, volume control corresponding to the AD value is not performed and a previous AD value stored in the AD value storage unit 5 is maintained.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a volume control device used for an electronic musical instrument that reproduces sounds such as pianos and organs, and is obtained by performing analog / digital conversion on the operation amount (physical input) to a plurality of operators. The present invention relates to a volume control device and a volume control program that perform volume control when a malfunction occurs in any of the controls when adjusting the volume by value.

For example, as disclosed in Patent Document 1, an electronic musical instrument sends musical sound data generated by operating a keyboard or an operation panel to a sound source provided in the electronic musical instrument, and a musical sound corresponding to the musical sound data of the sound source. A musical sound is generated by generating a signal and converting it into an acoustic signal by a speaker.
The volume of sound produced by an electronic musical instrument is converted into a voltage value (AD value) by analog / digital conversion of the rotation angle and movement amount by a potentiometer using a rotary type or dial switch as an operation element. Volume control is performed.

In addition, the electronic musical instrument includes a pedal as an operation element that imparts a damper pedal effect to the sound generation, and the effect is controlled according to the depression amount of the pedal. The control by the pedal is performed by a voltage value (AD value) subjected to analog / digital conversion in the same manner as the volume control operator described above.
In the electronic musical instrument, in addition to the pedal described above, an operation element that causes various effects regarding sound generation is provided, and various controls are performed by adjusting parameters according to the operation amount of the operation element.

  Then, the electric circuit (AD port) to which each of the controls for performing the volume control and the reverberation effect control described above is connected has a common power supply and ground to obtain a plurality of AD values as shown in FIG. Configured to use. In the circuit of FIG. 4, a potentiometer is connected to each of the eight operators, and depending on the positions of the operators 1-1 to 1-8 with respect to the resistor R, between the power line (3.3V) and the ground. An A / D converter is configured to output a voltage (AD value) divided at an arbitrary position.

Japanese Patent No. 2915735

  In the electrical circuit as described above, when an operator connected to an AD port, for example, a pedal breaks down, the power supply for AD becomes unstable, and the AD value corresponding to all the operators is the maximum value (power supply voltage). ) Or a minimum value (ground) occurs. Therefore, the AD value output by the volume control operator is also affected. A similar phenomenon may occur even when a failure occurs in the acoustic control operator itself.

  As noise countermeasures related to sound generation, the average value of AD values acquired several times is adopted, or volume control is performed so as to ignore instantaneous noise (due to a phenomenon in which the amount of change in AD value increases for a moment or static electricity). Although it is conceivable to deal with the software side to perform, as described above, when the AD value sticks to the maximum value or the minimum value, there is a problem that the output volume of the speaker or the like suddenly decreases to the maximum volume .

  The present invention has been proposed in view of the above circumstances, and in an electronic musical instrument, a volume control device and a volume control program that perform volume adjustment so that a sudden volume change does not occur even when a malfunction occurs in an operator. The purpose is to provide.

In order to achieve the above object, a volume control apparatus according to claim 1 includes a plurality of operators including volume adjustment, and performs analog / digital (AD) conversion on the operation amount (physical input) of each operator. In an apparatus for adjusting a parameter corresponding to the operation element by an AD value obtained by performing,
An AD value storage unit that stores the AD value according to the operation amount;
A change amount detector for detecting a change amount of the AD value;
When the change amount of the AD value related to the volume adjustment exceeds a predetermined value, the volume control is performed while maintaining the previous AD value stored in the AD value storage unit without performing the volume adjustment corresponding to the AD value. A volume control unit;
It is characterized by having.

Claim 2 is the volume control device of claim 1,
A display unit is provided for displaying an abnormality when the amount of change in the AD value related to the volume adjustment exceeds a predetermined value.

The volume control program according to claim 3 includes a plurality of operators including volume adjustment, and an AD value obtained by performing analog / digital (AD) conversion on an operation amount (physical input) of each operator. In the program for adjusting the parameter corresponding to the operation element in
A function of detecting a change amount of the AD value;
A function of performing control to maintain the previous state without performing volume adjustment corresponding to the AD value when the amount of change in the AD value related to the volume adjustment exceeds a predetermined value;
Is executed on a computer.

  According to the volume control device and the volume control program of the present invention, regarding the volume control of the electronic musical instrument, when the amount of change in the AD value exceeds a predetermined value, control is performed to maintain the previous state without performing volume adjustment. It is possible to prevent a situation in which the sound volume suddenly changes to the maximum value when the operating element fails.

It is a block diagram which shows the hardware constitutions of the electronic musical instrument provided with the volume control apparatus of this invention. It is a block diagram for demonstrating the function of the volume control apparatus of this invention. It is a flowchart figure which shows the process sequence in a volume control apparatus. It is an electric circuit diagram of an A / D converter composed of a plurality of operators and a potentiometer.

Hereinafter, an electronic musical instrument provided with a volume control device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the main hardware configuration of a digital piano (electronic musical instrument). A CPU 10, ROM 11, RAM 12, key scan circuit 16, sound source 18, and digital signal processing circuit 19 are connected to a bus 30. The configuration to do is built on the computer.
The CPU 10 is provided with an operator group 1 composed of a plurality of operators that perform physical inputs such as a rotation operation, a slide operation, and a stepping amount, tone selection, and sound settings (reverberation effect and sound effect settings). An operation panel 2 to be performed and a MIDI interface circuit 15 for performing MIDI data transfer control with an external device are connected.

Each operation element includes a volume switch 1a for adjusting the volume of sound generation, a pedal 1b for imparting a damper pedal effect to the sound generation, and the like.
The volume switch 1a is converted into a voltage value (AD value) by analog / digital conversion of an operation amount (physical input), which is a rotation angle or a movement amount, by a potentiometer, using a rotary or dial switch as an operator. Volume control is performed by changing the AD value.
The pedal 1b performs analog / digital conversion of the pedal depression amount (operation amount) to a voltage value (AD value) using a potentiometer, and changes the damper pedal effect for sound generation by changing the AD value, thereby performing reverberation effect control. .
The keyboard 17 is composed of a plurality of keys by which the performer instructs the pitch of a musical tone, and a key switch that opens and closes in conjunction with the keys. The keyboard 17 is connected to a key scan circuit 16 that scans the state of the key switch and outputs it as key data.

The CPU 10 controls the entire digital piano (electronic musical instrument) in accordance with a control program stored in the ROM 11. The control program includes a program for controlling each operator, such as a volume control program, so that a volume control device is constructed on the computer.
Further, the CPU 10 performs assigner processing for assigning a sound generation channel to key depression of the keyboard 17, access processing for the sound source 18, and the like.

  The ROM 11 stores various programs executed by or referred to by the CPU 3, various data, and the like. Programs and data stored in the ROM 11 are referred to by the CPU 10 via the system bus 30. That is, the CPU 10 is configured to read a control program (command) from the ROM 11 via the system bus 30 and interpret / execute it, and to read predetermined fixed data and use it for arithmetic processing.

  The RAM 12 is used as a working memory that temporarily stores various data necessary for the CPU 10 to execute a program. For example, the AD value obtained by A / D converting the operation amount (physical input) of each operator in the operator group 1, operation processing data by the operation panel 2, key data fetched from the keyboard 17, and the like are stored in the RAM 12. Temporarily stored. Data stored in the RAM 12 is referred to by the CPU 10 via the system bus 30.

  The key scan circuit 16 scans the state of the key switch of the keyboard 17 and outputs it as key data indicating the on / off state of the key. The key data is sent to the CPU 10 via the system bus 30 and temporarily stored in the RAM 12.

  The tone generator 18 is driven in accordance with musical tone data (a waveform address created corresponding to a timbre number, frequency data created corresponding to a key number, etc.) sent from the CPU 10, and generates a digital musical tone signal in a time division manner. . The digital musical tone signal generated by the sound source 18 is output to the digital signal processing circuit 19.

  The waveform memory 40 is composed of, for example, a ROM, and stores waveform data that has been subjected to pulse code modulation (PCM). The waveform memory 40 stores a plurality of types of waveform data (specified by tone color numbers) corresponding to each tone color in order to realize a plurality of tone colors. The waveform data stored in the waveform memory 40 is read by the sound source 18.

  The digital signal processing circuit 19 performs a predetermined calculation between the digital musical sound signal input from the sound source 18 and the coefficient input from the CPU 10 and outputs the result. For example, a coefficient determined by the amount of depression of the pedal 1b and a digital musical tone signal are calculated, and a digital musical tone signal to which a predetermined damper pedal effect is added is generated. The digital musical tone signal generated by the digital signal processing circuit 19 is supplied to the D / A converter 20.

  The D / A converter 20 converts the digital musical tone signal supplied from the sound source 18 into an analog musical tone signal. The analog tone signal output from the D / A converter 20 is sent to the amplifier 21.

  The amplifier 21 amplifies the input analog musical sound signal with a predetermined amplification factor and outputs it. The analog tone signal that has been amplified by the amplifier 21 is supplied to the speaker 22.

  The speaker 22 converts an analog musical sound signal as an electric signal into an acoustic signal. That is, the physical of the pedal that imparts a damper pedal effect to the sound corresponding to the depression of each key on the keyboard 17 with respect to the volume adjusted by physical input (rotation amount, movement amount, etc.) by an operator performing volume control. A sound effect corresponding to the input (depression amount) is added to produce a sound.

FIG. 2 is a block diagram illustrating functions of a volume control device built in an electronic musical instrument by an acoustic control program.
The volume control device performs analog / digital (AD) conversion on an operator group 1 composed of a plurality of operators including volume adjustment, and an operation amount (physical input) of each operator to perform AD. An A / D converter 3 for obtaining a value, a change amount detection unit 4 for detecting a change amount of the AD value, an AD value storage unit 5 for storing the AD value, and a parameter corresponding to the operator with the AD value are adjusted. A volume control unit 6 that performs control and a display unit 7 that displays a volume control state as necessary are configured.

As shown in FIG. 1, the operator group 1 includes a plurality of operators such as a volume switch 1a for adjusting the volume of sound generation and a pedal 1b for imparting a damper pedal effect to the sound generation.
The operation amount (physical input) from each operator is output to the A / D converter 3, and analog / digital (AD) conversion is performed to obtain an AD value.

  The change amount detection unit 4 detects the change amount from the previously acquired AD value and the immediately previous (current) acquired AD value. Further, the AD value storage unit 5 stores the acquired AD value.

When the change amount of the AD value related to the volume adjustment detected by the change amount detection unit 4 is greater than or equal to a predetermined value set in advance, the volume control unit 6 recognizes that an abnormality has occurred and performs volume adjustment corresponding to the AD value. Instead, volume control is performed to maintain the previous input state based on the previously acquired AD value.
Further, when the change amount of the AD value related to the volume adjustment is less than the predetermined value, the volume adjustment is performed corresponding to the AD value acquired immediately before (this time).
The display unit 7 blinks the indicator when the volume control unit 6 recognizes that an abnormality has occurred in the volume control.

Next, processing in the volume control device will be described with reference to the block diagram of FIG. 2 and the flowchart of FIG.
The electronic musical instrument is activated when the power is turned on (step 31), and initialization processing of the CPU 10, RAM 12, sound source 18 and the like is performed (step 32).
In the initialization process, the CPU 10 internal registers and flags are cleared, initial value setting processes for various buffers, registers, flags, etc. defined in the RAM 12, and initial values are set in the sound source 18 to generate unnecessary sounds. A process for preventing this is performed.

Next, as the processing of the main routine (step 33), an AD value corresponding to the operation amount (physical input) of each operator in the operator group 1 is acquired by the A / D converter 3 (step 34).
Subsequently, the change amount detection unit 4 detects the change amount (difference) ΔX between the AD value acquired this time (immediately before) and the AD value acquired last time, and the volume control unit 6 detects the change amount ΔX detected in advance. A comparison is made as to whether or not the predetermined value a is exceeded (step 35).

If the detected change ΔX is greater than or equal to a predetermined value a set in advance, it is recognized that an abnormality has occurred and error processing is performed (step 36).
In the error processing, when the detected change amount ΔX is related to the volume switch 1a, the previous input state is maintained by the previously acquired AD value without performing the volume adjustment corresponding to the AD value acquired immediately before. Perform volume control. At this time, the indicator of the display unit 7 is turned on.

  Even in the case where the detected change amount ΔX is not related to the volume switch 1a, the process of adjusting the parameter to maintain the previous input state based on the previously acquired AD value instead of the previously acquired AD value (error for volume control) The same processing as the processing is performed. Alternatively, a process of adjusting the parameter corresponding to the operator with the AD value acquired immediately before (ignoring the error state) (a process similar to the normal process) may be performed.

  If the detected change ΔX is less than the predetermined value a set in advance, normal processing for adjusting the parameter corresponding to the operator with the AD value acquired immediately before is performed (step 37), and the main routine (step 33) The following processing is repeated. That is, in the case of volume adjustment, a volume corresponding to the operation amount of the volume switch 1a is output.

  According to the above-described volume control device, when the volume control of the electronic musical instrument is performed, if the change amount ΔX of the AD value related to the volume adjustment is equal to or greater than the predetermined value a, the previous state is maintained without performing the volume adjustment. Since the volume control is performed, even when one of the plurality of operating elements breaks down and the AD value corresponding to the operating element outputs the maximum value or the maximum value, the situation where the volume suddenly changes to the maximum value. It is possible to prevent damage to the hearing and the speaker.

  DESCRIPTION OF SYMBOLS 1 ... Operation element group, 1a ... Volume switch, 1b ... Pedal, 2 ... Operation panel, 3 ... A / D converter, 4 ... Change amount detection part, 5 ... AD value memory | storage part, 6 ... Volume control part, 7 ... Display unit 10 ... CPU, 11 ... ROM, 12 ... RAM, 18 ... sound source.

Claims (3)

In a device that includes a plurality of controls including volume adjustment, and adjusts parameters corresponding to the controls with an AD value obtained by performing analog / digital (AD) conversion on the operation amount of each control,
An AD value storage unit that stores the AD value according to the operation amount;
A change amount detector for detecting a change amount of the AD value;
When the change amount of the AD value related to the volume adjustment exceeds a predetermined value, the volume control is performed while maintaining the previous AD value stored in the AD value storage unit without performing the volume adjustment corresponding to the AD value. A volume control unit;
A volume control apparatus comprising:   The volume control apparatus according to claim 1, further comprising: a display unit that displays an abnormality when the amount of change in the AD value related to the volume adjustment exceeds a predetermined value. In a program comprising a plurality of controls including volume control, and adjusting parameters corresponding to the controls with an AD value obtained by performing analog / digital (AD) conversion on the operation amount of each control,
A function of detecting a change amount of the AD value;
A function of performing control to maintain the previous state without performing volume adjustment corresponding to the AD value when the amount of change in the AD value related to the volume adjustment exceeds a predetermined value;
Is executed on a computer.