JP2616606B2 - Electronic musical instrument - Google Patents

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 which synthesizes various musical tones with a plurality of operators to produce sounds.

[0002]

2. Description of the Related Art In a conventional electronic musical instrument, a sound effect may be given to a musical sound by using a foot pedal in addition to playing on a keyboard. Foot pedals include a type that takes an ON state when depressed and a type (make type) and a type that takes the opposite state (break type). These foot pedals
It is connected by inserting a plug provided at the end of the cord extending from the foot pedal into a jack (female type) provided on the electronic musical instrument main body.

[0003]

In the above-mentioned electronic musical instrument, however, there is no function of judging the type of the foot pedal, so that there is a problem that the foot pedal to be used cannot be freely selected. The present invention has been made in view of the above circumstances, and has as its object to provide an electronic musical instrument that can be connected to any type of foot pedal.

[0004]

In order to solve the above-mentioned problems, the present invention provides an electronic musical instrument main body and an electronic musical instrument.
Plugs that are detachably connected to jacks provided on the main unit
Electronic musical instrument consisting of a foot pedal with
Detecting means for detecting a voltage level applied to the jack; and when the foot pedal is connected to the jack.
In the state where the foot pedal is connected,
Output means and the voltage level detected by the foot pedal.
In the state where the sensor is not connected,
By comparing to the detected voltage level,
The foot pedal has a sound effect when depressed.
Of the first type to be given or the opposite of the first type
Judging means for judging whether it is of the second type to work ,
The synthesized tone signal is added to the electric power detected by the detection means.
Characterized by comprising a tone generating means for imparting acoustic effect based on the determination result of pressure level and the determination means.

[0005]

According to the present invention, the electronic control unit determines whether or not the electronic device has been detected by the detecting means.
Mark the jack when the foot pedal is connected to the instrument
The applied voltage level and when the foot pedal is not connected
To the voltage level applied to the jack
Therefore, when the connected foot pedal is depressed,
The first type to provide a sound effect or vice versa
Judge whether it is the second type to work . Then, the musical sound generating means compares the determination result with the detection result of the detecting means described above.
The sound effects are imparted to the tone signal based on.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of one embodiment of the present invention. In this figure, a CPU 1 executes a predetermined program to control the entire electronic musical instrument,
Various data (parameters) are supplied to each unit via the data bus DB. Various data obtained when executing this program are stored in the RAM 2. The panel switch 3 is provided with a plurality of switches, volumes, and the like for setting a tone color, a sound effect, and the like. Is read.

The keyboard circuit 4 is a so-called keyboard composed of a white key and a black key. The state of each key (key pressing, key release, key pressing speed, etc.) is processed after data processing by the interface 4a. It is read by the CPU 1.
The tone signal generating section 5 synthesizes a tone signal to which a predetermined pitch and a sound effect are added according to the tone information (or data) supplied by the CPU 1 and emits the tone signal through the speaker 6.

Next, the jack 7 is of a type in which a contact CN is separated when a plug provided on a foot pedal described later is inserted. The contact pin J1 with which one electrode of the plug, that is, the electrode to which a signal is supplied contacts, is pulled up to + 5V by the resistor R1, and
A / D via resistor R2 and capacitor C connected in series
It is connected to the input of an (analog / digital) converter 8. The resistor R2 and the capacitor C are for removing noise when a plug described later is connected to the jack 7.

The other contact of the plug, that is, the contact pin J2 to which the electrode on the ground side contacts is grounded.
Midpoint contact J3 having the above-mentioned contact pin J1 and contact CN
Is the resistance R when the plug is not inserted.
1 is grounded. In this embodiment, the resistor R1 that pulls up and the resistor R1 that grounds the middle point contact J3 have the same resistance value. The above-mentioned A / D converter 8 converts a signal supplied through the jack 7 into a digital signal and outputs the digital signal.

Next, the above-mentioned foot pedal FP will be described with reference to FIGS. First, FIG.
(A) is an explanatory view showing a configuration of a foot pedal FP1 including a make-type switch that turns on a switch SW1 when depressed. The state of the switch SW1 is connected to each electrode of the plug by a two-wire code. FIG.
(B) is an explanatory view showing a configuration of a foot pedal FP2 including a break-type switch in which a switch SW2 is turned off when depressed. In the foot pedal FP2, the state of the switch SW2 is connected to the plug in the same manner as the above-described foot pedal FP1.

Next, FIGS. 2C and 2D show variable resistors VR1, VR2 in place of the switches SW1, SW2 provided in the above-mentioned foot pedals FP1, FP2.
FIG. 4 is an explanatory diagram showing a structure of foot pedals FP3 and FP4 provided with VR2. FIG. 2C shows a variable resistor VR1 provided so that the resistance value decreases when stepped on.
Are shown. FIG. 2D shows a foot pedal FP4 including a variable resistor VR2 provided to increase a resistance value when depressed.
It is shown. The variable resistors VR1 and VR2 are 0∞
It is assumed that the resistance value is Ω. Foot pedal F described above
Plugs provided in P1 to FP4 are inserted into the jack 7 shown in FIG.

In the jack 7, when the plug is not inserted, the midpoint contact J3 is pressed against the contact CN, so that the pull-up resistor R1 and the grounding resistor R1 are connected in series. The A / D converter 8 is supplied with 2.5 V which is a half value of the power supply voltage. On the other hand, when the plug of the makeup type foot pedal shown in FIG. 2A is inserted, the contact CN is separated, and the switch SW1 is opened when the pedal is not depressed. The D converter 8 is supplied with a power supply voltage of 5 V. When the pedal is depressed, the switch SW1 is closed and the contact pin J
Since 1 is grounded, the A / D converter 8 is supplied with 2.5 V or less (almost 0 V).

When the plug of the break-type foot pedal shown in FIG.
When N is released and the pedal is not depressed, the switch SW2 is closed and the contact pin J1 is grounded, so that 2.5 V or less (almost 0 V) is supplied to the A / D converter 8. It has become. When the pedal is depressed, the switch SW2 is in an open state, so that the A / D converter 8 is supplied with a power supply voltage of 5 V.

The foot pedal shown in FIG.
A signal similar to that of the make-type foot pedal shown in FIG. 2A is supplied to the A / D converter 8, and the foot pedal shown in FIG. A signal similar to that of the pedal is given to the A / D converter 8. However,
Since a variable resistor is used in place of the switch, 0-5
A voltage between V is supplied to the A / D converter 8.

Next, the operation of the electronic musical instrument having the above configuration will be described with reference to the flowcharts shown in FIGS. First, when the power is turned on, the CPU 1 executes a main routine shown in FIG. When the main routine is executed, first, in step SA1, initialization is performed to set registers, flags, and the like to initial values. Next, in step SA2, jack processing 1 shown in FIG. 4 is performed.

In the jacking process 1 shown in FIG. 4, first, in step SB1, digital data output from the A / D converter 8 is stored in the register OLD. Next, in step SB2, whether the value of the register OLD is smaller than 2.5 V, 2.5 V (equal to), or 2.
It is determined whether it is greater than 5V. This is to determine whether or not the plug of the foot pedal has been inserted into the jack 7. Further, when the plug is inserted into the jack 7, it is to determine whether the foot pedal is a make type or a break type foot pedal.

In step SB2, when the register OLD is larger than 2.5 V, that is, when a make-type foot pedal is connected, step SB3 is executed.
Proceed to. In step SB3, the flag flag is set to "1".
Is set. On the other hand, if the register OLD is smaller than 2.5 V in step SB2, that is, if a break-type foot pedal is connected, step SB2 is executed.
Proceed to 4. In step SB4, "2" is set in the flag flag. Then, the above-mentioned step SB3 or SB4 is completed, or
In the case where the register OLD is 2.5V,
It is determined that the connection is not established, and the process returns to the main routine shown in FIG.

Next, in the main routine, step SA
Proceed to 3. At step SA3, panel processing is performed. In the panel processing, the state of the panel switch 3 shown in FIG. 1 is read, and a value corresponding to those states is set in a predetermined register. Next, step SA4
Then, keyboard processing is performed. In the keyboard processing, states such as a key press and release of the keyboard circuit 4 shown in FIG. 1 are read, and values corresponding to those states are supplied to predetermined units. And
Proceed to step SA5. At step SA5, jack process 2 is executed.

The jack process 2 is executed according to a flowchart shown in FIG. In jacking process 2, first,
In step SC1, digital data output from the A / D converter 8 is stored in the register NEW. Next, the routine proceeds to step SC2, where it is determined whether or not the flag is “0”. If the result of the determination in step SC2 is "NO", that is, if either the make-type or the break-type foot pedal is connected, the process proceeds to step SC3. Step SC
At 3, it is determined whether the register OLD is equal to the register NEW. This is to determine whether or not the connected foot pedal has been operated.

If the result of the determination in step SC3 is "YES", that is, if the foot pedal is connected but no operation is performed,
The process returns to the main routine shown in FIG. Then, in this case, the process proceeds to step SA6 of the main routine, and after performing other processes, returns to step SA3 again and repeatedly executes the above-described steps SA3 to SA6.

On the other hand, a foot pedal is connected,
In addition, if any operation, that is, the pedal is depressed, the content of the register OLD is different from the content of the register NEW.
And proceeds to step SC4. In step SC4,
It is determined whether the register NEW is smaller than 2.5 V, 2.5 V (equal to), or larger than 2.5 V.

If the value of the register NEW is smaller than 2.5 V in step SC4, the flow advances to step SC4.
Go to 5. In step SC5, it is determined whether the flag is "1" or "2". And
In step SC5, when the flag is "1", that is, when a make-type foot pedal is connected, it is determined that the pedal is depressed, and the process proceeds to step SC6. At Step SC6, the register DATA is turned on. On the other hand, if the flag flag is "2" in step SC5, that is, if a break-type foot pedal is connected, it is determined that the pedal is not depressed, and step SC5 is performed.
Proceed to 7. At Step SC7, the register DATA is turned off.

On the other hand, in step SC4,
If the value of the register NEW is larger than 2.5 V, the process proceeds to step SC8. In step SC8, the flag flag is set.
Is “1” or “2”. Then, in step SC8, the flag is set to “1”.
In other words, if a make-type foot pedal is connected, it is determined that the pedal has not been depressed, and the flow proceeds to step SC9. In step SC9,
The register DATA is turned off. On the other hand, in step 8, when the flag flag is "2", that is, when the break type foot pedal is connected, it is determined that the pedal is depressed, and step SC1 is performed.
Go to 0. At step SC10, the register DATA is turned on.

Then, the above-mentioned steps SC6, SC
When the processing of 7, SC9 or SC10 ends, the process proceeds to step SC11. In step SC11, the contents of the register DATA set in each step are supplied to the musical tone signal generator 5 shown in FIG. The tone signal generator 5 applies a sound effect such as sustain to the tone according to the contents of the register DATA. That is, when the register DATA is on, the sound effect is applied to the musical sound, and when the register DATA is off, the application of the sound effect is stopped.

On the other hand, in step SC4,
If the value of the register NEW is 2.5 V, it is determined that the plug of the foot pedal has been removed from the jack 7, and the process proceeds to step SC12. In step SC12, the flag fl
Set “0” to ag.

When the processing in step SC11 or step SC12 is completed, step S
Proceed to C13. In step SC13, the register OLD
In the register NEW, and the new value is used as the old value. Then, the jack process 2 ends, and the process returns to the main routine shown in FIG. In the main routine, after performing the other processes of step SA6, the process returns to step SA3 again, and repeats steps SA3 to SA6 described above.

On the other hand, if the result of the determination in step SC2 is "YES", that is, if the foot pedal is not yet connected at this stage (or the plug is once inserted and then unplugged). In this case, the process proceeds to step SC14. Step SC14
Then, if the register NEW is less than 2.5V or 2.5
V (equal to) or greater than 2.5V. This is to determine again whether the plug has been inserted.

If it is determined in step SC14 that the register NEW is larger than 2.5 V, that is, if a make-type foot pedal is connected, step SC14 is executed.
Proceed to 15. In step SC15, “1” is set to the flag flag. On the other hand, in step SC14, if the register NEW is smaller than 2.5 V, that is, if a break-type foot pedal is connected, the process proceeds to step SC16. In step SC16, “2” is set to the flag flag.

Then, the above-mentioned step SC15 or SC
If 16 has been completed, the flow advances to step SC13. In step SC13, as described above, the register OLD
In the register NEW, and the new value is used as the old value. Then, the jack process 2 ends, and the process returns to the main routine shown in FIG. On the other hand, if the value of the register NEW is 2.5 V in step SC14, it is determined that the connection is not established, and the process returns to the main routine shown in FIG. In the main routine, after performing the other processes of step SA6, the process returns to step SA3 again, and repeats steps SA3 to SA6 described above.

In the above-described embodiment, if the plug is inserted into the jack 7 while the pedal is still depressed, the type of the foot pedal is determined to be wrong. However, this may be used to add a sound effect when the foot is released from the pedal. Therefore, in this case, the plug is inserted into the jack 7 while the pedal is depressed. Also, a plurality of jacks 7 may be provided, and effect functions such as sustain and restenute may be freely assigned to one jack.

In the above-described embodiment, when no plug is inserted, 2.5 V is supplied to the A / D converter 8, but the accuracy of the A / D converter 8 in this case is Not a problem. For example, A having 4-bit resolution
When the / D converter is used, the output of the A / D converter takes a value of 0 to 15 (decimal), and therefore takes an intermediate value of 7 for 2.5 V. . If the value of 2.5 V is used as the judgment value, the influence of noise and the accuracy error of the hardware cannot be absorbed. Therefore, a certain dead zone is provided, and for example, a plug of 2.3 to 2.7 V is inserted. It may be determined that it is not in the state. In this case, the same effect can be obtained even if the bit precision of the A / D converter 8 is reduced.

If the dead zone described above is too wide, when a volume-type foot pedal is used, the plug is inserted when the shifting pedal is in the dead zone when the pedal is depressed or when the foot is released from the pedal. There is a risk that it will be judged that it is not inserted. To prevent this, it is only necessary to determine that the plug has been unplugged for the first time when the dead zone is detected several times in succession.

[0033] Also, in the embodiment described above, had been treated without the distinction of Bollywood-menu-time type and switch type, 0V,
When an intermediate value other than 5 V and 2.5 V is detected, it is determined that the volume type is used, and processing is performed separately from the switch type.

[0034]

As described above, according to the present invention, according to the present invention , the electronic means is provided by the determination means and the detection result of the detection means.
Mark the jack when the foot pedal is connected to the instrument
The applied voltage level and when the foot pedal is not connected
To the voltage level applied to the jack
Therefore, when the connected foot pedal is depressed,
The first type to provide a sound effect or vice versa
Judge whether it is the second type to work , and the judgment result and the above
Sound effect based on the voltage level detected by the detecting means
Since the result is added to the synthesized tone signal, there is an advantage that any type of foot pedal can be connected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of one embodiment of the present invention.

FIG. 2 (a) is a foot pedal FP including a make-type switch that turns on a switch SW1 when depressed;
1, (b) is an explanatory diagram showing a configuration of a foot pedal FP2 provided with a break type switch in which a switch SW2 is turned off when depressed, and (c) and (d) are described above. A foot pedal FP provided with variable resistors VR1 and VR2 instead of the switches SW1 and SW2 provided in the foot pedals FP1 and FP2
FIG. 3 is an explanatory diagram showing the structure of FP4.

FIG. 3 is a flowchart of a main routine for explaining the operation of the present embodiment.

FIG. 4 is a flowchart of a jack process 1 for explaining the operation of the present embodiment.

FIG. 5 is a flowchart of a jack process 2 for explaining the operation of the present embodiment.

[Explanation of symbols]

1 ... CPU (judgment means), 3 ... panel switch, 4
... Keyboard circuit, 5... Tone signal generating circuit (tone generating means), 7... Jack (detecting means), 8... A / D converter (detecting means), FP1 to FP4. ), SW1, SW2 ... switch (element), VR
1, VR2: Variable resistor (element).

Claims (1)

(57) [Claims] An electronic musical instrument main body and a main body provided on the electronic musical instrument main body.
With a plug that is detachably connected to the jack
In an electronic musical instrument comprising a foot pedal , a detecting means for detecting a voltage level applied to the jack, and when the foot pedal is connected to the jack,
The detecting means in a state where the foot pedal is connected;
Is connected to the voltage level detected by the
Detected by the detection means in a state where
Before being connected by comparing the
The foot pedal gives a sound effect when depressed
It is of the first type or performs the reverse operation of the first type.
Determining means for determining whether the signal is of the second type, and adding the electric signal detected by the detecting means to the synthesized tone signal.
Electronic musical instrument characterized by comprising a tone generating means for imparting acoustic effect based on the determination result of pressure level and the determination means.