JP4935348B2 - Musical sound control device and musical sound control processing program - Google Patents

Description

  The present invention relates to a musical tone control device and a program for musical tone control processing, and more particularly to a musical tone control device for controlling an effect added to a musical tone to be generated and a program for musical tone control processing.

In an acoustic piano, when the soft pedal is depressed, the position of the hammer that strikes the string shifts in the horizontal direction, and the position of the felt relative to the string changes, so that the timbre and volume change. In this case, changes in timbre and volume can be adjusted according to the amount of depression of the soft pedal. That is, when the amount of depression is small, the tone becomes soft, but the volume decreases only slightly. When the amount of depression is increased, the timbre changes and the volume is greatly reduced.
On the other hand, even in high-class electronic keyboard instruments, musical tone control processing that simulates an acoustic piano by providing two or more contacts to the soft pedal and detecting the stepping amount of the soft pedal step by step It is carried out.
Alternatively, it has been proposed to detect the frequency of key pressing and add a human voice, that is, a vocal sound, to a musical sound generated by operating the keyboard. For example, in an electronic musical instrument of a certain prior art document, a configuration is disclosed in which key press frequencies of an upper keyboard, a lower keyboard, and a pedal keyboard are detected and a phoneme tone is switched according to the key press frequency (patent) Reference 1). In this electronic musical instrument, the key pressing frequency detection unit 4 in FIG. 3 or FIG. 5 performs the total time required for the maximum sound pressing key detected by the vocal sound detection unit 6 to change x times, or a fixed time. The key press frequency is detected from the number of changes of the highest sound press key in the voice, and the phoneme of the human voice is switched.
JP 58-203495 A (Japanese Patent Publication No. 4-12475)

However, compared to an inexpensive electronic keyboard instrument in which only a single contact is provided on the soft pedal, the mechanism of a high-end electronic keyboard instrument in which two or more contacts are provided on the soft pedal has a complicated mechanism. Therefore, there was a problem that the manufacturing and adjustment costs were high. In the case of the electronic musical instrument disclosed in Patent Document 1, the total time required for the highest sound pressing key to change x times is calculated as in the key pressing frequency detection unit 4 shown in FIG. Or, like the key pressing frequency detection unit 4 shown in FIG. 5, the phoneme of the human voice cannot be switched until the number of times the highest sound pressing key has changed within a certain time is calculated. There is a problem that an effect cannot be added in real time to a musical tone being played.
The present invention is to solve such a conventional problem, and is an inexpensive electronic device that can add a multi-stage effect to a musical tone being played in real time without incurring manufacturing and adjustment costs. The purpose is to provide a keyboard instrument.

The musical tone control apparatus according to claim 1 is a first detection means for detecting a performance signal generated in response to an operation of a keyboard, and a soft pedal that changes to either an on state or an off state in accordance with the operation. Second detecting means for detecting the state of the soft pedal, and when the second detecting means detects that the soft pedal has changed from the on state to the off state, the soft pedal has changed to the on state again. Measuring means for measuring the duration of the soft pedal off state until the second detecting means is detected, and the off state immediately before being measured by the measuring means when the soft pedal is on. Effect control means for adding an effect corresponding to the duration of the sound to the performance signal detected by the first detection means.

  2. The musical sound control apparatus according to claim 1, wherein the effect control means is configured to detect the second detection when the duration of the off state measured by the measurement means is shorter than a predetermined time. A first effect is added to the performance signal detected by the first detection means in response to the soft pedal on operation detected by the means, and the duration of the off state measured by the measurement means is a predetermined time or longer. In this case, a second effect is added to the performance signal detected by the first detection means in response to the soft pedal on operation detected by the second detection means.

According to a third aspect of the present invention, there is provided a program for musical tone control processing including a first step of detecting a performance signal generated in response to an operation of a keyboard, and software that changes to either an on state or an off state in accordance with the operation. A second step of detecting a pedal state; and when the second step detects that the soft pedal has changed from an on state to an off state, the soft pedal has changed to an on state again. A third step of measuring the duration of the soft pedal in an off state until detected by the second step, and a time immediately before the measurement by the third step when the soft pedal is in an on state . And causing the computer to execute a fourth step of adding an effect corresponding to the duration of the off state to the performance signal detected by the first step. It is characterized in.

  According to the musical tone control apparatus and the musical tone control processing program of the present invention, it is possible to obtain an effect that multiple stages of effects can be added to the musical tone being played in real time without causing an increase in manufacturing and adjustment costs.

Hereinafter, embodiments of a musical tone control apparatus according to the present invention will be described with reference to the drawings, taking an electronic keyboard instrument as an example.
FIG. 1 is an external view showing a configuration of an electronic keyboard instrument 1 according to the embodiment. In FIG. 1, a keyboard 2 generates a performance signal including a pitch and velocity (volume) in response to an operation of an arbitrary key. The soft pedal 3 and the other sostenuto pedal and damper pedal each have a simple structure including a single contact switch, and the contact switch is changed from the off state to the on state by a stepping operation of the foot. When the soft pedal 3 is not operated and the contact switch is in the OFF state, the two speakers 4 are set by the pitch and volume according to the performance signal generated by the performance of the keyboard 2 and the switch. When a musical tone based on the tone color or the default tone color is generated and the soft pedal 3 is operated, an effect is added to the generated musical tone. That is, the tone to be generated is changed to a soft tone color, and an effect of attenuating the tone volume is added.

  FIG. 2 is a block diagram showing a system configuration of the electronic keyboard instrument 1 of FIG. In FIG. 2, the CPU 11 scans the keyboard 2 and the soft pedal 3 and other sostenuto pedals and damper pedals of FIG. 1 through a predetermined interface (not shown) such as a matrix circuit, and turns on each key and each pedal.・ Detects OFF. The CPU 11 is also connected to the ROM 12, RAM 13, timer 14, and sound source 15. The ROM 12 stores a program for musical tone control processing executed by the CPU 11 and other control processing programs. The RAM 13 is a work area of the CPU 11 and includes a register 13a, a counter 13b, and the like. The timer 14 measures time according to a start command from the CPU 11, stops measurement according to a stop command, and inputs the measured time to the CPU 11.

When event data and a sound generation command corresponding to a performance signal generated by the performance of the keyboard 2 are given from the CPU 11, the sound source 15 reads waveform data from an internal waveform ROM (not shown) and generates a musical sound signal. . Further, the sound source 15 is provided with a soft effect adding circuit 15a. The soft effect addition circuit 15a adds an effect to the musical sound signal generated by the sound source 15 when the effect addition signal from the CPU 11 is on. A sound system 16 is connected to the sound source 15. This effect addition signal is a 2-bit signal, for example, and gives four types of effect commands “00”, “01”, “10”, and “11” to the sound source 15. When the effect addition signal is “00”, no effect is added. When the effect addition signal is “01”, the effect “1” is added to the tone signal of the sound source 15. When the effect addition signal is “10”, the effect “2” is added to the tone signal of the sound source 15. When the effect addition signal is “11”, the effect “3” is added to the tone signal of the sound source 15. The effect addition signal may be a signal of 3 bits or more. As the number of bits increases, the types (stages) of effects added to the tone signal of the sound source 15 increase.
The sound system 16 includes an A / D conversion circuit, a filter circuit, an amplifier circuit, and the like (not shown), converts a musical sound signal output from the sound source 15 from digital to analog, performs filter processing and amplification processing, and performs speaker processing. Start with 4.

3 to 5 are flowcharts of a control program executed by the CPU 11.
FIG. 3 is a flowchart of the main routine. First, a predetermined initialization process is executed (step SA1). In the initialization process, the register 13a, the counter 13b, and other data areas in the RAM 13 are cleared to “0”. Next, keyboard processing corresponding to the operation of the keyboard 2 is executed (step SA2). That is, on / off of each key of the keyboard 2 is detected, and the detection result is temporarily stored in the RAM 13. Next, a soft pedal process for the operation of the soft pedal 3 is executed (step SA3), and other sostenuto pedals and damper pedals execute another pedal process for the operation (step SA4). Then, sound source processing is executed in accordance with the operation of the keyboard 2 and each pedal (step SA5). Next, another process is executed according to the operation of the switch group (step SA6), the process proceeds to step SA2 and the above process is repeated.

  4 and 5 are flowcharts of the soft pedal process in step SA4 of FIG. In this soft pedal process, three steps of control of soft effect 1, soft effect 2, and soft effect 3 are performed by operating the soft pedal 3. The soft effect 1 softens the tone, the soft effect 2 reduces the volume, and the soft effect 3 limits the volume to the minimum value.

  In FIG. 4, it is determined whether or not the soft pedal 3 is currently in an off state (step SB1). If the soft pedal 3 is in an off state, whether the register 13a of the RAM 13 is “0” or “1”. Is discriminated (step SB2). The register 13 a is set to “1” when the soft pedal 3 changes from the off state to the on state by the previous operation, and is cleared to “0” when the soft pedal 3 changes from the on state to the off state. If the soft pedal 3 is currently in the off state and the register 13a is “0”, the soft pedal 3 is not operated, and the process returns to the main routine of FIG.

  In step SB2, when the register 13a is “1”, the soft pedal 3 that has been turned on by the previous operation is changed to the off state by the current operation. In this case, the timer 14 is started (step SB3), the value of the register 13a is cleared to "0" (step SB4), the effect addition signal for the software effect addition circuit 15a is turned off, and the software effect of the sound source 15 is turned off. Is set to “0 (no effect added)” (step SB5). Then, the process returns to the main routine of FIG.

  In step SB1, if the soft pedal 3 is currently on, it is determined in FIG. 5 whether the value of the register 13a is “0” or “1” (step SB6). When the value of the register 13a is “0”, it is determined whether the current value of the timer 14, that is, the duration T of the soft pedal 3 in the off state is shorter than the predetermined time TS or longer than the predetermined time TS. (Step SB7).

  When the duration T of the soft pedal 3 in the off state is shorter than the predetermined time TS, it is determined whether or not the value of the counter 13b is “0” (step SB8). When the value of the counter 13b is “0”, an effect addition signal for applying the soft effect “1” is output to the sound source 15 and the effect is added to the musical sound signal of the sound source 15 (step SB9). Next, “1” is added to the current value of the counter 13b (step SB10), and the value of the register 13a is set to “1” (step SB11). Then, the timer 14 is stopped (step SB12), and the process returns to the main routine of FIG.

  In step SB8, when the value of the counter 13b is not “0”, it is determined whether or not the value of the counter 13b is “1” (step SB13), and when the value of the counter 13b is “1”. Outputs an effect addition signal for applying the soft effect “2” to the sound source 15 and adds the effect to the tone signal of the sound source 15 (step SB14). Next, “1” is added to the current value of the counter 13b (step SB10), and the value of the register 13a is set to “1” (step SB11). Then, the timer 14 is stopped (step SB12), and the process returns to the main routine of FIG.

  In step SB13, when the value of the counter 13b is not “1”, that is, when the value of the counter 13b is “2” or more, an effect addition signal for applying the soft effect “3” is output to the sound source 15. Thus, an effect is added to the musical tone signal of the sound source 15 (step SB15). Next, “1” is added to the current value of the counter 13b (step SB10), and the value of the register 13a is set to “1” (step SB11). Then, the timer 14 is stopped (step SB12), and the process returns to the main routine of FIG.

In step SB7, when the duration T of the soft pedal 3 in the off state is equal to or longer than the predetermined time TS, the value of the counter 13b is cleared to “0” (step SB16) and the software effect “1” is applied. The effect addition signal is output to the sound source 15 to add an effect to the tone signal of the sound source 15 (step SB17). Next, the value of the register 13a is set to “1” (step SB11), the timer 14 is stopped (step SB12), and the process returns to the main routine of FIG.
In step SB6, when the value of the register 13a is “1”, the soft pedal 3 is currently in an on state, and the process returns to the main routine of FIG.

FIG. 6 is a timing chart showing an example of the value of the register 13a, the value of the counter 13b, the content of the effect, and the operation of the timer 14 that change according to the operation of the soft pedal 3 in the soft pedal processing of FIGS. is there. In FIG. 6, ef0 represents a soft effect 0 (no effect), ef1 represents a soft effect 1, ef2 represents a soft effect 2, and ef3 represents a soft effect 3.
In the example of FIG. 6, the soft pedal 3 is turned on (1), on (2), on (3), on (4), and on (5), and is turned on five times. Before the first ON (1) operation, the register and counter values are cleared to “0”, and the content of the effect is ef0 (soft effect 0). Further, the timer is stopped and its value is “0”. In this state, the loop returning to the main routine is repeated without adding an effect through steps SB1 and SB2 of FIG.

When the soft pedal is turned on (1), the process proceeds from step SB1 in FIG. 4 to step SB6 in FIG. In this case, since the value of the register is “0”, the process proceeds from step SB6 to step SB7. Now, since the value of the timer is “0”, which is shorter than the predetermined time ST, the process proceeds from step SB7 to step SB8, and since the value of the counter is “0”, the process further proceeds to step SB9. Then, ef1 (soft effect 1) is applied to the sound source. Next, the counter value is changed from “0” to “1” in step SB10, and the register value is changed from “0” to “1” in step SB11. In this case, since the timer is stopped, in step SB12, the process returns to the main routine without performing a stop process.
In the period when the soft pedal is in the on state by the on (1) operation, the process proceeds from step SB1 in FIG. 4 to step SB6 in FIG. In this case, since the value of the register is “1”, the process directly returns to the main routine. The same applies to the period when the soft pedal is in the on state by the on (2) to on (5) operation.

When the soft pedal is turned off after the on (1) operation, the process proceeds from step SB1 to step SB3 in FIG. 4 to start a timer. Therefore, the value of the timer increases in proportion to the passage of time as in the triangular waveform shown in FIG. Further, the process proceeds from step SB3 to step SB4, and the value of the register is changed from “1” to “0”. In step SB5, the soft effect is set to zero. That is, ef1 (soft effect 1) applied to the sound source when the soft pedal is turned on (1) is changed to ef0 (soft effect 0).
Similarly, when the soft pedal is turned off after the on (2) to on (5) operation, the register value is changed from “1” to “0”, and the soft effect applied to the sound source is changed to ef0 ( Change to soft effect 0).

  Next, when the soft pedal is turned on (2), the process proceeds from step SB1 in FIG. 4 to step SB6 in FIG. In this case, since the value of the register is “0”, the process proceeds from step SB6 to step SB7. In this case, since the timer value T is shorter than the predetermined time ST, the process proceeds from step SB7 to step SB8. In this case, since the value of the counter is “1”, the process proceeds to step SB8, step SB13, and step SB14, and ef2 (soft effect 2) is applied to the sound source. Next, the counter value is changed from “1” to “2” in step SB10, and the register value is changed from “0” to “1” in step SB11. Furthermore, the timer is stopped in step SB12.

  Next, when the soft pedal is turned on (3), the process proceeds from step SB1 in FIG. 4 to step SB6 in FIG. In this case, since the value of the register is “0”, the process proceeds from step SB6 to step SB7. In this case, since the timer value T is shorter than the predetermined time ST, the process proceeds from step SB7 to step SB8. In this case, since the value of the counter is “2”, the process proceeds to step SB8, step SB13, and step SB15, and ef3 (soft effect 3) is applied to the sound source. Next, the counter value is changed from “2” to “3” in step SB10, and the register value is changed from “0” to “1” in step SB11. Furthermore, the timer is stopped in step SB12.

  Next, when the soft pedal is turned on (4), the process proceeds from step SB1 in FIG. 4 to step SB6 in FIG. In this case, since the value of the register is “0”, the process proceeds from step SB6 to step SB7. In this case, since the timer value T is shorter than the predetermined time ST, the process proceeds from step SB7 to step SB8. In this case, since the value of the counter is “3”, the process proceeds to step SB8, step SB13, and step SB15, and ef3 (soft effect 3) is applied to the sound source. Next, in step SB10, the counter value is changed from “3” to “4”, and in step SB11, the register value is changed from “0” to “1”. Furthermore, the timer is stopped in step SB12. That is, when the counter value is “2” or more, the maximum effect ef3 (soft effect 3) is applied to the sound source.

  Next, when the soft pedal is turned on (5), the process proceeds from step SB1 in FIG. 4 to step SB6 in FIG. Since the value of the register is “0”, the process proceeds from step SB6 to step SB7. In this case, since the timer value T is equal to or longer than the predetermined time ST, the process proceeds from step SB7 to step SB16, the counter value is changed from “4” to “0”, and ef1 (soft effect) is applied to the sound source in step SB17. 1). In step SB11, the value of the register is changed from “0” to “1”. Furthermore, the timer is stopped in step SB12.

As described above, according to the embodiment, the CPU 11 detects the performance signal generated in response to the operation of the keyboard 2 and changes to either the on state or the off state in accordance with the operation. 3 state is detected. When the soft pedal 3 changes from the on-state to the off-state, the timer 14 measures the duration T of the off-state until the soft pedal 3 changes to the on-state again, and the effect according to the measured duration T of the off-state. (Soft effect 1, soft effect 2, soft effect 3) are added to the performance signal. Further, the effect is immediately added at the timing of the on operation of the soft pedal 3.
Therefore, by using the soft pedal 3 having a simple structure with a single contact switch, it is possible to add a multi-stage effect to the musical sound being played in real time without incurring an increase in manufacturing and adjustment costs. it can.

In this case, when the measured duration time T of the off state is shorter than the predetermined time TS, the CPU 11 applies the soft effect 1 to the performance signal detected according to the operation of the keyboard 2 at the timing of the on operation of the soft pedal 3. When the effect 2 of the soft effect 2 or the soft effect 3 is added and the duration T of the measured off state is equal to or longer than the predetermined time TS, the soft pedal 3 is turned on according to the operation of the keyboard 2 The effect of the soft effect 1 is added to the performance signal detected.
Therefore, by operating the soft pedal 3 and adjusting the duration T of the OFF state, a multi-stage effect can be added.

Further, when the CPU 11 detects that the soft pedal 3 has changed from the off state to the on state a plurality of times in a period shorter than the predetermined time TS, the CPU 11 stores the number of changes in the counter 13b, and the effect corresponding to the counter value. Is added to the performance signal detected in accordance with the operation of the keyboard 2. When the counter value is “0”, the effect of the soft effect 1 is added. When the counter value is “1”, the effect of the soft effect 2 is added. When the counter value is “2” or more, the effect of the soft effect 3 is added. Add effects.
Therefore, by operating the soft pedal 3 and continuously switching between the on state and the off state, it is possible to add a multi-stage effect.

  In this embodiment, the soft effect is added in three steps according to the counter value. However, the soft effect is set in four steps or more and the effect is added by operating the soft pedal 3. It may be configured. According to such a configuration, since it is not limited to the mechanical operation of the soft pedal as in the acoustic piano, it is possible to add a variety of effects that exceed the functions of the acoustic piano.

  In this embodiment, the configuration in which the soft pedal 3 is used to add the effect of the three-level soft effect has been described. An effect mode switch may be provided to switch between a three-stage soft effect mode and a soft effect on or off mode.

  In the above-described embodiment, the invention of the device in which the CPU 11 executes the musical tone control processing program stored in advance in the ROM 12 of the electronic keyboard instrument has been described. However, external storage such as a flexible disk (FD), CD, memory card, etc. Install the musical tone control processing program recorded on the medium in a writable non-volatile memory such as a hard disk or flash ROM, or install the musical tone control processing program downloaded from a network such as the Internet in the non-volatile memory. The program can be executed by the CPU 11. In this case, the invention of the program and the invention of the recording medium on which the program is recorded can be realized.

That is, a program for musical tone control processing according to the present invention includes a first step for detecting a performance signal generated in response to an operation of a keyboard, and a soft pedal that changes to either an on state or an off state in accordance with the operation. A second step of detecting the state of the soft pedal, and when the second step detects that the soft pedal has changed from the on state to the off state, the fact that the soft pedal has changed to the on state again. A third step of measuring the duration of the soft pedal off state until it is detected by the second step, and an effect according to the duration of the off state measured by the third step of the first step. A fourth step of adding to the performance signal detected by the steps of
Is executed by a computer.
Therefore, similarly to the invention of the device in the above-described embodiment, by using the soft pedal 3 having a simple structure with a single contact switch, it is possible to achieve a musical tone during performance without incurring manufacturing and adjustment costs. Multiple stages of effects can be added in real time.

The external view which shows the structure of the electronic keyboard musical instrument of embodiment of this invention. The block diagram which shows the system configuration | structure of the electronic keyboard instrument of FIG. The flowchart of the main routine performed by CPU11 of FIG. The flowchart of the soft pedal process in FIG. The flowchart of the soft pedal process following FIG. The timing chart according to operation of the soft pedal of FIG.

Explanation of symbols

1 Electronic keyboard instrument 2 Keyboard 3 Soft pedal 4 Speaker 11 CPU
12 ROM
13 RAM
14 timer 15 sound source 15a software effect addition circuit 16 sound system

Claims (3)

First detection means for detecting a performance signal generated in response to an operation of the keyboard;
Second detection means for detecting the state of the soft pedal that changes to either the on state or the off state according to the operation;
When it is detected by the second detection means that the soft pedal has changed from the on state to the off state, until the second detection means detects that the soft pedal has changed to the on state again. Measuring means for measuring the duration of the soft pedal in the off state;
Effect control means for adding an effect according to the duration of the off state immediately before measured by the measurement means to the performance signal detected by the first detection means when the soft pedal is on ;
A musical sound control apparatus comprising:   When the duration of the OFF state measured by the measuring unit is shorter than a predetermined time, the effect control unit is configured to detect the first detection according to the soft pedal on operation detected by the second detecting unit. When the first effect is added to the performance signal detected by the means and the duration of the OFF state measured by the measuring means is a predetermined time or more, the software detected by the second detecting means The musical tone control apparatus according to claim 1, wherein a second effect is added to the performance signal detected by the first detection means in response to a pedal-on operation. A first step of detecting a performance signal generated in response to a keyboard operation;
A second step of detecting a soft pedal state that changes to either an on state or an off state in response to an operation;
When it is detected by the second step that the soft pedal has changed from the on state to the off state, until the second step detects that the soft pedal has changed to the on state again, A third step of measuring the duration of the soft pedal off state;
A fourth step of adding, to the performance signal detected by the first step, an effect corresponding to the duration of the immediately previous off state measured by the third step when the soft pedal is on; ,
A program for musical tone control processing that causes a computer to execute.

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