JPH01136192A - Electronic musical instrument - Google Patents

Abstract

PURPOSE: To control player's performance operation noise so as not to be offensive to ears by reducing the volume of speaker means to small volume when a headphone is turned to a using state. CONSTITUTION: The electronic musical instrument is provided with a musical sound signal generating means 4, speaker means 6L, 6R for generating a musical sound based upon a musical sound signal S2, a headphone 2, and a volume control means 10 for reducing the volume of the musical sound generated from the speaker means 6L, 6R to small volume. When the headphone 2 is turned to a using state, the means 10 generates a musical sound with a small volume reduced from the speaker means 6L, 6R. Since a low volume musical sound is generated so as to be superposed to performance operation noise generated when a player performs a sound specification means 3, a trouble that the performance operation noise is offensive to ears is effectively reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to electronic musical instruments, and is applied to electronic musical instruments in which a performer can listen to the performance sound using headphones.

[Summary of the invention]

In an electronic musical instrument that can use headphones, the present invention reduces the volume of a speaker means to a low volume when the headphones are in use, thereby controlling the noise of a performer's performance operation so that it does not become harsh to the ears. be able to.

[Conventional technology]

Conventionally, in an electronic musical instrument 1 such as an electronic piano, for example,
As shown in FIG. 8, headphones 2 are used to allow the performer to listen to the sound of the performance.

That is, the electronic musical instrument l provides the musical tone signal generating device 4 with the key information S1 obtained by operating the keys of the keyboard section 3 by the performer, so that the musical tone signal generating device 4 sends the left stereo signal S2L and the left stereo signal S2L to the sound system 5. By supplying the musical tone signal S2 consisting of the right stereo signal S2R, musical tones can be generated from the left and right speakers 6L and 6R (this performance mode is referred to as a speaker performance mode), and the volume of the musical tones can be controlled by the sound system 5. Adjustments can be made by operating the master volume 7 that is located there.

The sound system 5 is provided with a headphone jack 8, and when a performer listens to musical tones using the headphones 2, a headphone plug 9 is inserted into the headphone jack 8.

Here, the contact of the headphone jack 8 is connected to the musical sound signal output control circuit 10, and when the headphone plug 9 is inserted into the headphone jack 8, the musical sound signal S2 is output to the headphone 2 side, and the left and right speakers 6L
and 6R.

In this way, it is possible to construct a so-called electronic musical instrument with a headphone terminal, and by using this electronic musical instrument with a headphone terminal, the performer can transmit the musical sound signal generated by playing the keyboard section 3, and transmit a loud musical sound to the surroundings. It is possible to perform in a performance mode in which only the performer can listen without emitting sound (this is called a headphone performance mode), and in this way, for example, a performer can give lessons on an electronic musical instrument late at night at a general home. In some cases, such as when multiple students practice electronic instruments in a music classroom, etc.
It is possible to easily realize an electronic musical instrument in which one can practice performance operations on a keyboard section 3 without having continuous windows around the surrounding area.

[Problem that the invention seeks to solve]

However, when the headphone plug 9 of the headphones 2 is inserted into the headphone jack 8 in this way, the conventional method prevents the left and right speakers 6L and 6R from emitting musical tones, so that the player does not operate the keyboard section 3 to play. When playing an electronic musical instrument, there is an inconvenience that performance operation noise, such as the noise generated when a key is struck or the noise generated when a key is released and returned, can be heard as harsh noise by people other than the performer who are around the electronic musical instrument. .

Incidentally, when the keys of the keyboard are pressed down by the player, they are configured to rotate downward about a fulcrum until they come into contact with a stopper for regulating the pressed position, and
When the player releases the key, the return spring rotates until it comes into contact with a return position regulating stopper. Therefore, when a key is pressed down, when the key comes into contact with the stopper for regulating the pressed position, or when the key comes into contact with the stopper for regulating the return position when returning,
It is unavoidable that performance operation noise such as "rattling" will occur.

However, since such noise does not have musicality like a musical tone, it may appear as unpleasant and harsh noise to people other than the performer.

This invention has been made in consideration of the above points, and aims to propose an electronic musical instrument that can cause as little discomfort as possible to those nearby when playing the electronic musical instrument in headphone performance mode. It is.

[Means for solving problems]

In order to solve this problem, the present invention includes a sound specifying means (3) for specifying a musical tone to be generated by a performer's performance operation, and a specified output of this sound specifying means (3).
a musical tone signal generating means (4) that generates a musical tone signal (S2) corresponding to the musical tone signal (S1), speaker means (6L, 6R) and headphones (
2) and a volume control means (10) for reducing the volume of the musical tone generated by the speaker means (6L, 6R) to a low volume when the headphone (2) is in use.

[Effect]

When the headphones 2 are in use, the volume control means 1
0 causes the speaker means 6L and 6R to generate a musical tone with a reduced volume.

In this way, people who are around the electronic musical instrument can hear the performance operation noise because the low-volume musical tone is generated so as to overlap the performance operation noise generated when the performer plays the sound specifying means 3. This can effectively reduce the possibility that the sound will be harsh on the ears.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

[1] In FIG. 1, in which parts corresponding to those in FIG. 8 of the first embodiment are given the same reference numerals, 11 indicates an electronic musical instrument as a whole, and a sound system 5 receives left and right stereo signals S2L and S2R. ,
The signal is applied to the musical tone signal output control circuit 10 via the left and right speaker amplifier circuits 12L and 12R, which are controlled by the mask volume 7, respectively.

The musical sound signal output control circuit 10 has a left contact part 13L and a right contact part 13R of the headphone jack 8, and when the headphone plug 9 is inserted through the socket contact part 14,
The left and right tip portions 9L and 9R contact the corresponding first contact pieces 16L and 16R, respectively, and push these contact pieces 16L and 16R apart in the vertical direction in the figure, thereby causing the wA edge spacers 17L and 1
7R to push and bend the second contact pieces 18L and 18R upward and downward, thereby switching contact 19L with a normally closed contact configuration.
and 19R are turned off.

Left (and right) speaker amplifier circuit 12L (and 12R)
When the headphone plug 9 is not inserted into the headphone jack 8, the output signal obtained as the amplified output S3L (and S 3 R) of the switching contact 19L (and 19R) and the second contact piece 18°L (and 18R) are sequentially supplied to the left (and right) speakers 6L (and 6R), and thus the left (and right) speakers 6L (and 6R) generate relatively loud musical tones depending on the adjustment position of the mask volume 7. It is done like this.

On the other hand, the sound leakage adjusting volumes 21L and 21R are connected in parallel with the current path of the switching contacts 19L and 19R1 and the second contact pieces 18L and 18R, so that when the headphone plug 9 is inserted into the headphone jack 8, the switch is switched. By turning off the contacts 19L and 19R, the output signals obtained as amplified outputs S3L and S3R from the left and right speaker amplifier circuits 12L and 12R pass through the sound leakage adjustment volumes 21L and 21R to the left and right speakers 6L and 12R. Supplied to 6R. Thus, left (and right)
The speaker 6L (and 6R) generates a musical sound whose volume is reduced to a low volume due to the insertion of the leakage adjustment volume 21L (and 21R).

In addition, when the headphone plug 9 is inserted into the headphone jack 8, the amplifier circuit 1 for the left and right speakers
The output signals output from 2L and 12R as amplified outputs S3L and S3R are led out to the first contact pieces 16L and 16R through output resistors 22L and 22R, and are further connected to the left and right tip portions 9L and 9R. is supplied to the headphones 2 via. As a result, the headphones 2 generate a musical tone at a relatively low volume determined by the resistance values of the output resistors 22L and 22R.

In the configuration shown in Figure 1, if the performer uses the headphone jack 8
In the speaker performance mode where the headphone plug 9 is not inserted, the left (and right) speaker 6L (and 6R)
From this, a state is obtained in which a loud musical tone can be generated.

On the other hand, when the performer enters the headphone performance mode by inserting the headphone plug 9 into the headphone jack 8, musical tones are sent to the headphones 2 via the output resistor 22L (and 22R). At the same time, the left (and right) speakers 6L (and 6R) can generate musical tones at a low volume through the noise adjustment volume 21L (and 21R).

Thus, according to the above configuration, low volume musical tones are output from the left (and right) speakers 6L (and 6R).

Therefore, the noise adjustment volume 21L (and 21R)
By selecting the resistance value as necessary, the volume of the musical sound reduced to the low volume can be set to a level where the operating noise of the keyboard section 3 will not be jarring to people around the electronic musical instrument. By doing so, it is possible to effectively avoid causing discomfort to people around the player due to performance operation noise.

Incidentally, the low-volume musical sounds generated from the left (and right) speakers 6L (and 6R) have musicality, so even if people around you can hear them, the performance will not have a musicality, such as a "clattering" sound. Compared to operation noise, the degree of discomfort caused can be further reduced.

[2] Second Embodiment FIG. 2 shows another embodiment of the present invention, and as shown by assigning the same reference numerals to corresponding parts as in FIG. 1, the sound system 5 shown in FIG. A configuration different from that used in this case is applied.

That is, in the case of FIG. 2, the left and right stereo signals S2L
and S2R are voltage dividing resistors 25L, 26L and 25R12
It is grounded through a series circuit consisting of 6R, and the divided voltage obtained at the midpoint of the connection is applied to the left and right speaker amplifier circuit 12.
The amplified outputs S3L and S3R of the left and right speaker amplifier circuits 12L and 12H are used as input signals S5L and S5R of the left and right speakers 6L and 12R, respectively, and are directly supplied to the left and right speakers 6L and 6R.

Field-effect transistors (FETs) 27L and 27R for variable voltage dividing resistance are connected in parallel to the voltage dividing resistors 26L and 26H on the ground side, and their gates connect one end to the voltage source +VCC.
The other ends of the load resistors 28L and 28R are connected to the second contact piece 18 of the headphone jack 8.
L and 18R1 are grounded sequentially through switching contacts 19L and 19R.

Thus, the headphone plug 9 is connected to the headphone jack 8.
In the speaker performance mode in which the FET 27L (and 27R) for variable voltage dividing resistance is turned off by being grounded through the second contact piece 18L (and 18R) and the switching contact 19L (and 19R) in sequence. state, and thus the input signal S5L (and 55R) is connected to the voltage dividing resistor 26L (and 26
R), a sufficiently high voltage value is maintained, and as a result, a loud musical tone is generated from the left (and right) speaker 6L (and 6R).

On the other hand, in the headphone performance mode, when the headphone plug 9 is inserted into the headphone jack 8, the switching contact 19L (and 19R) is turned off, and therefore the voltage dividing resistance variable FE727L (and 27R) is turned off.
This is turned on by pulling up the gate of the voltage source VCC to the voltage source VCC.

At this time, the resistance value when the voltage dividing resistance variable FET 27L (and 27R) is conductive becomes a sufficiently small value, so the input signal S
The voltage value of 5L (and 55R) also becomes small, and as a result, a musical tone whose volume is sufficiently reduced is generated from the left (and right) speaker 6L (and 6R).

On the other hand, the left (and right) stereo signal 52L (and 52R) is processed by the headphone amplifier circuit 29L (and 29R).
Thus, the headphone 2 generates musical sound through the headphone plug 9 at a volume determined by the degree of amplification of the headphone amplifier circuit 29L (and 29R).

In the case of this embodiment, the headphone amplifier circuits 29L and 2
The gain of 9R is made controllable by the headphone volume 29, thus allowing the performer to adjust the volume of the headphones 2.

According to the configuration shown in FIG. 2, in the headphone performance mode, it is possible to generate musical tones at a low volume from the left and right speakers 6L and 6R, and the volume is controlled by the voltage dividing resistors 25L and 25R, 126L and 26R. By selecting the voltage division resistance ratio as necessary, the volume of the performance operation noise generated when the player operates the keyboard part 3 can be made so loud that it cannot be distinguished as unpleasant noise by surrounding people.

Thus, according to the configuration shown in FIG. 2, the same effects as in the case shown in FIG. 1 can be obtained.

[3] Third Embodiment FIG. 3 shows still another embodiment of the present invention. In this case, as shown by assigning the same reference numerals to corresponding parts as in FIG. The amplified outputs S3L and S3R of circuits 12L and 12R are sent to the low volume speaker and right speaker 6.
In addition to directly supplying LL and 6RL, switching contact 19L
and 19R1, the second contact pieces 18L and 18R are sequentially valved to supply the normal volume power and the right speakers 6LH and 6RH. Note that the low volume speaker is, for example, a high impedance speaker, and the normal volume speaker is a low impedance speaker.

In the configuration shown in FIG. 3, in the speaker performance mode in which the headphone plug 9 is not inserted into the headphone jack 8, the left (and right) speaker amplifier circuit 12L
The amplified output S3L (and 53R) of (and 12R) is transmitted to low volume human (and right) speaker 6LL (and 6RL), and normal volume power (and right) speaker 6LH (and 6RH).
), the volume of the musical tone generated is a composite of the volumes of these four speakers.

On the other hand, when the headphone performance mode is entered by inserting the headphone plug 9 into the headphone jack 8, the switching contact 19L (and 19R) turns off.
Normal volume power (and right) speaker 6LH (and 6RH)
The amplified output S3L (and 53R) is no longer supplied to the amplified output S3L (and 53R), and the volume of the musical tone generated is reduced to a low volume equal to the volume generated from the low-volume user and the right speaker 6LL (and 6RL).

Therefore, according to the configuration shown in Figure 3, the low volume user (and the right)
If the volume of the musical tones from the speakers 6LL (and 6RL) is selected as necessary to such an extent that the performance operation noise of the keyboard section 3 cannot be heard, the performance operation noise will cause discomfort to people around the electronic musical instrument. It is possible to avoid giving Thus, according to the configuration of FIG. 3, the same effects as described above with respect to FIG. 1 can be obtained.

In the case of this embodiment, impedances of 400 [Ω] are used for the low volume level and right speakers 6LL and 6RL, and impedances of 4 [Ω] are used for the normal volume level and right speakers 6LH and 6RH. obtain.

[4] Fourth Embodiment FIG. 4 shows still another embodiment of the present invention. In this case, the left speaker amplifier circuit 12L is shown with the same reference numerals attached to corresponding parts as in FIG. 1. The amplified output S3L of
The low volume left speaker 6LL is supplied to the ground through the normally closed contact NC of the first contact 31LX1 of the volume switching relay 31L, and the normally closed contact NG of the second contact 31LX2 of the volume switching relay 31L is supplied to the ground. It is connected to the ground through the left volume speaker 6LH.

Similarly, the amplified output S of the right speaker amplifier circuit 12R
3R is low volume right speaker 6RL, volume switching relay 3
It is supplied to the ground through the normally closed contact NC of the first contact 31RX1 of the volume selector relay 31R, and is also supplied to the ground through the normally closed contact NG of the second contact 31RX2 of the volume switching relay 31R and the normal volume right speaker 6RH. connected to.

In addition to this, contacts 31LX2 and 31LX1゜31RX
The normally open contacts of 2 and 31RX1 are connected to each other.

In the configuration shown in FIG. 4, the volume switching relay 31L (and 3
1R) is in the off operating state, the low volume user (and right) speaker 6LL (and 6RL) and the normal volume user (and
and right) By connecting speakers 6LH (and 6RH) in parallel, a relatively large amplified output S3L is achieved.
(and 53R) is for low volume (and right) speaker 6L
L (and 6RL), normal volume power (and right) speaker 6
The sound flows in parallel to LH (and 6RH), and the volume of the musical tone generated thereby becomes a large volume as a composite volume of the four speakers.

On the other hand, the volume switching relay 31L (and 3IR)
When 31LX1 turns on, its contact 31LX1 (and 31
By switching RX1), 31LX2 (and 31RX2) to the write contact NO side, the amplified output S3L (
and 53R) is the low volume user (and right) speaker 6LL
(and 6RL), normal volume human (and right) speaker 6L
H (and 6RH) in series.

In this way, the low volume user (and right) speaker 6LL
(and 6RL) and the normal volume human (and right) speaker 6LH (and 6RH) are connected in series, the composite impedance seen from the output end of the left (and right) speaker amplifier circuit 12L (and 12R) is As the output current increases, the value of the output current decreases accordingly, and the volume of the generated musical tone is eventually reduced to a lower volume.

In the case of the embodiment shown in FIG. 4, the volume switching relays 31L and 31
One end of R is connected to the voltage source +VCC, and the other end is grounded through switching transistors 30L and 30R.

The bases of the switching transistors 30L and 30R are connected to bias resistors 32L and 32R, 33L and 33R.
are sequentially connected to the voltage source +vcc, and the middle points of the connections are connected to the second contact pieces 18L and 18R, and the switching contacts 19L and 19R are grounded.

In the configuration shown in FIG. 4, in the speaker performance mode in which the headphone plug 9 is not inserted into the headphone jack 8, the base of the switching transistor 30L (and 30R) is grounded, so that the switching transistor 30L (and 30R) When the volume switching relays 31L and 31R are turned off, the volume switching relays 31L and 31R become de-energized. As a result, contact 31LX1 (and 31R
XI) The musical tone generated by connecting the low volume human (and right) speaker 6LL (and 6RL) and the normal volume human (and right) speaker 6LH (and 6RH) in parallel through 31LX2 (and 31RX2) becomes louder.

On the other hand, when the headphone performance mode is entered by inserting the headphone plug 9 into the headphone jack 8, the switching contact 19L (and 19R) turns off.
A voltage source +VCC is applied to the base of the switching transistor 30L (and 30R), which turns on.
This turns on the volume switching relay 31L (and 31R).

As a result, contacts 31LX1 (and 31RX1), 31
By connecting the low-volume human (and right) speaker 6LL (and 6RL) and the normal-volume human (and right) speaker 6LH (and 6RH) in series through LX2 (and 31RX2), the volume of the generated musical tones can be increased as a whole. As a result, the volume is further reduced.

Therefore, according to the configuration of FIG. 4, it is possible to obtain the same effect as described above with respect to FIG. 4 [5] Fifth Embodiment FIG. 5 shows still another embodiment of the present invention. In this case, as shown by assigning the same reference numerals to corresponding parts as in FIG. The amplified outputs S3L and S3R of the amplifier circuits 12L and 12R pass in series through the left and right speaker 6L and 6R1 output resistors 22L and 22R to the first output.
It is led out to contact pieces 16L and 16H.

At the same time, the connection midpoint between the left and right speakers 6L and 6R and the output resistors 22L and 22R is connected to the second contact piece 1.
8L and 18R1 are grounded through switching contacts 19L and 19R in sequence.

In the configuration shown in FIG. 5, in the speaker performance mode in which the headphone plug 9 is not inserted into the headphone jack 8, the switching contacts 19L (and 19R) are turned on, so that the left (and right) speaker amplifier circuit Amplified output S3L obtained from 12L (and 12R) (
and 53R) are left (and right) speakers 6L (and 6R)
After passing through the switching contact 19L (and 19R), it flows to ground. Therefore, left (and right) speaker 6L (and 6
A loud musical tone is generated from R).

On the other hand, when the headphone performance mode is entered in which the headphone plug 9 is inserted into the headphone jack 8, the switching contact 19L (and 19R) turns off, and the left side of the headphone plug 9 is connected to the first contact piece 16L (and 16R). (and right) When the chip portions 9L and 9R (Fig. 1) come into contact, the amplified output S3L (and 53R) is output to the left (
and right) Speaker 6L (and 6R), output resistor 22L
(and 22R), the first contact piece 16L (and 16R), and the headphone plug 9 to flow into the headphones 2 in series.

As a result, the left (and right) speaker 6L (and 6R),
By connecting the headphones 2 in series, the volume of the musical tone generated from the left (and right) speaker 6L (and 6R) is reduced by the connection of the output resistor 22L (and 22R) and the headphones 2. reduced to

According to the configuration shown in FIG. 5, in the headphone performance mode, the volume of musical tones generated in the left and right speakers 6L and 6R can be further reduced to a lower volume, thereby achieving the same effect as described above with respect to FIG. effect can be obtained.

[6] Sixth Embodiment FIG. 6 shows still another embodiment of the present invention. In this case, left and right stereo signals S2L and S2R are voltage dividing resistors 35L and 35R136L2 and 36R2, 36L1
and 36R1 are grounded through a series connection circuit, or (
The divided voltages S7L and S7R obtained at the midpoint of the connection
is applied to left and right speaker amplifier circuits 12L and 12R.

The amplified outputs S3L and S3R of the left and right speaker amplifier circuits 12L and 12R are directly supplied to the left and right speakers 6L and 6R, and are also connected to output resistors 22L and 22R.
The first contact pieces 16L and 16H are led out through the first contact pieces 16L and 16H.

In addition to this, voltage dividing resistors 36L1 and 36R on the ground side
FETs 37L and 37R for variable voltage dividing resistance are connected in parallel to 1, and their gates are connected to the voltage source +VCC through load resistors 38L and 38R, and the second contact piece 18
L and 18R1 are connected to ground through switching contacts 19L and 19R in sequence.

In the configuration shown in FIG. 6, when the speaker performance mode is in which the headphone plug 9 is not inserted into the headphone jack 8, the switching contacts 19L (and 19R) are turned on, so that the voltage dividing resistance variable FET 37L (and 37
When the gate of R) is grounded, it becomes an OFF operating state, and therefore the left (and right) speaker amplifier circuit 12L (
and 12R), voltage dividing resistors 35L (and 35R), 3
6L2 (and 36R2), 36L1 (and 36R
Divided voltage S7L (and 57R) determined by the voltage division ratio of 1)
is supplied.

Here, the resistance values of the ground side voltage dividing resistors 36L1 and 36L2 (and 36R1 and 36R2) are selected to be sufficiently large, so at this time, the left (and right) speaker 6L
(and 6R) becomes louder.

On the other hand, when the headphone performance mode is entered in which the headphone plug 9 is inserted into the headphone jack 8, the switching contact 19L (and 19R) turns off, so that the voltage is applied to the gate of the voltage dividing resistance variable FET 37L (and 37R). When the voltage of source +VCC is applied and turns on, the conduction resistance value changes to the voltage dividing resistor 36L1 on the ground side.
(and 36R1) in parallel.

As a result, the divided voltage 57L (and 57R) applied to the left (and right) speaker amplifier circuit 12L (and 12R)
Since the value of the voltage dividing resistor variable FE737L (and 37R) is smaller than the value of the voltage dividing resistor 36L1 (and 36R1), the value of the voltage dividing resistor 36L2 (and 36R2)
) is determined by the resistance value of the left (
The amplified output 53L (and 53R) supplied to the (and right) speaker 6L (and 6R) is reduced, and the volume of the musical tone generated from the public figure (and right) speaker 6L (and 6R) is reduced to a low volume.

If the configuration is as shown in FIG. 6, the same effect as in the case of FIG. 1 can be obtained.

[7] Seventh Embodiment FIG. 7 shows still another embodiment of the present invention, and as shown by assigning the same reference numerals to corresponding parts as in FIG. 4, left and right speakers 6L and 6R are used. By applying tapped speakers, the amplified outputs S3L and S3R of the left and right speaker amplifier circuits 12L and 12R are further transmitted through taps TI and T2 derived from both ends of the drive coils 41L and 41R of the left and right speakers 6L and 6R. Volume switching relay 3
1L and 31R contacts 31LX3 and 31RX3 are connected to ground through the normally closed contacts NC, and
Intermediate tap T3 is connected to ground through normally open contacts NO of contacts 31LX3 and 31RX3.

In the configuration shown in FIG. 7, in the speaker performance mode in which the headphone plug 9 is inserted into the headphone jack 8, the volume switching relay 31L (and 3IR) is in a de-energized state, so that its contacts 31LX3 (and 3IR) are in a de-energized state.
RXT)'s normally closed contact NC is turned on. Therefore,
At this time, the amplified output S3L (and 53R) flows through the taps T1 and T2 at both ends of the drive coil 41L (and 41R), so that the volume of the musical tone generated from the left (and right) speaker 6L (and 6R) increases. Become.

On the other hand, in the headphone performance mode when the headphone plug 9 is inserted into the headphone jack 8, the volume switching relay 31L (and 31R) is energized, and the normally open contact No. of the contact 31LX3 (and 31RX3) is turned on. Operate. Therefore, at this time, of the drive coil 41L (and 41R), the contact 31LX3 (and 31
As the drive output 53L (and S 3 R) flows through the normally open contact NO of the left (and right) speaker 6L (and 6R), the drive efficiency of the left (and right) speaker 6L (and 6R) decreases.
and right) The volume of musical tones generated from the speakers 6L (and 6R) is reduced to a low volume.

According to the configuration shown in FIG. 7, the left and right speakers 6L and 6R
By switching the drive efficiency of the left and right speakers 6L and 6R in the headphone performance mode, the volumes of the left and right speakers 6L and 6R can be reduced to a low volume, thus achieving the same effect as described above with respect to FIG. 4.

[8] Other Embodiments (1) In the embodiments described above, the present invention was applied to an electronic musical instrument that uses two channels of stereo signals as musical tone signals to generate musical tones. However, the present invention can be widely applied even if the number of channels of the musical sound signal is monaural or three or more channels.

(2) In the embodiment of FIG. 1, the left and right speakers 6
Leakage adjustment volume 21L and 2 for L and 6R
Although 1R is provided, this volume may be replaced with a fixed resistor if necessary, and in some cases, even if this is omitted, the same effect as in the above case can be obtained.

(3) In order to reduce the volume of musical sounds generated from the speakers in the headphone performance mode, the speaker magnets generate a magnetic field in the opposite direction to that during normal operation, thereby reducing the electrical noise of the speakers. Even if the volume of the generated musical tone is reduced to a low volume by lowering the conversion efficiency, the same effect as described above can be obtained.

(4) In addition, as a means to reduce the volume of musical sounds emitted from the speakers to a low volume, a lid is provided at the opening of the speaker box, and by closing the lid as necessary in the headphone performance mode, the sound can be heard from the speaker box. The volume of the musical sound emitted may be reduced to a low volume.

(5) In the above-described embodiment, a case has been described in which, in a keyboard-type electronic musical instrument, the discomfort caused by the performance operation noise generated from the keys when operating the keyboard is reduced. However, the present invention can be widely used to reduce the discomfort caused by harsh noises caused by a player's performance operations, such as the noise generated when a player hits a pad on an electronic drum. It is possible.

(6) Furthermore, in addition to applying the embodiments shown in FIGS. 1 to 7 individually, two or more of these embodiments may be combined.

(7) In order to reduce the volume of musical tones to a low volume, the overall volume of musical tones may be reduced by, for example, stopping the operation of one of the left and right speakers that generate stereo musical tones.

〔Effect of the invention〕

As described above, according to the present invention, when switching to the headphone performance mode, the volume of the musical sound generated from the speaker is reduced to a low volume and continues to be generated, so that when the performer performs performance operations, By generating a low-volume musical tone superimposed on the noise generated by the electronic musical instrument, it is possible to further reduce the harshness of the performance operation noise for people around the electronic musical instrument.

FIG. 8 is a block diagram showing the overall configuration of the electronic musical instrument.

4...Headphones, 5...Sound system, 6L, 6R...Left and right speakers, 8.
... Headphone jack, 9 ... Headphone plug, 10 ... Musical sound signal output control circuit,
16L, 16R...First contact piece, 17L, 1
7R...Spacer, 18L.

18R...Second contact piece, 19L, 19R...
...Switching contact.

Claims (1)

[Scope of Claims] Sound specifying means for specifying a musical tone to be generated by a performer's performance operation; musical tone signal generating means for generating a musical tone signal corresponding to a specified output of the sound specifying means; Speaker means and headphones that generate musical tones based on musical tone signals; and volume control means that reduces the volume of the musical tones generated by the speaker means to a low volume when the headphones are in use. Characteristic electronic musical instruments.