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DESCRIPTION JPH07239682

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DESCRIPTION JPH07239682
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electronic musical instrument, and more particularly to an electronic musical instrument having
a built-in speaker and a headphone jack.
[0002]
2. Description of the Related Art Some conventional electronic musical instruments have a builtin speaker and one or two headphone jacks, one in one headphone jack and two in one
headphone jack. When the headphone plug is inserted, sound generation from the speaker is
prohibited. FIG. 3 is a circuit diagram showing an example of a sound system of an electronic
musical instrument having a built-in speaker and one headphone jack. The outputs of the left
channel and right channel amplifiers 10 and 11 are connected to the left speaker 12 and the
right speaker 13 respectively and are also connected to the third and first terminals of the
connector CN1. The negative terminals of the speakers 12 and 13 are also connected to the sixth
and fifth terminals of the connector CN1.
[0003]
The headphone unit 14 has the headphone jack J1, the signal attenuation resistors R1 and R2,
the surge absorption varistors SA1 and SA2, and the connector CN2 connected as shown in FIG.
3 and mechanically inserting the headphone plug into the jack J1 The interlocking contacts 15
and 16 are opened, and the connection between the sixth and fifth terminals of the connector
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CN2 to which the negative terminals of the speakers 12 and 13 are connected and the ground
(terminals 2 and 4) is opened, and the speaker circuit Cut.
[0004]
SUMMARY OF THE INVENTION In the conventional electronic musical instrument as described
above, it is necessary to pull out the headphone plug when it is desired to produce sound from
the speaker. For example, in a group music class, some or all of the students The speaker's
performance and the ensemble are pronounced by the speaker, and when using headphones
when practicing each individual, it is necessary to repeat the insertion and removal of the
headphone plug, which hinders the progress of the class smoothly, and the plug, jack and cord
There is a problem that it causes contact failure and disconnection.
[0005]
Also, in order to pull the signal of the student instrument into the teacher instrument and check
the signal of any student instrument, the signal was taken from the student instrument line out
terminal, but the line out output has a small signal level In addition, since the impedance is high,
it is easy to pick up noise and there is also a problem that it is not possible to take a long
distance.
An object of the present invention is to improve the problems of the prior art as described above,
and to provide an electronic musical instrument capable of controlling sound generation from a
speaker without inserting and removing a headphone plug.
[0006]
According to a first aspect of the present invention, in an electronic musical instrument having a
built-in speaker and a headphone jack, a switch means is connected in parallel with a headphone
jack contact for disconnecting the circuit of the speaker in conjunction with insertion of the
headphone plug. It is characterized by being.
[0007]
The second invention provides an electronic musical instrument having a built-in speaker and a
first headphone jack, wherein a second headphone jack is provided in addition to the first
headphone jack, and the second headphone jack is interlocked with the insertion of the
headphone plug. The contacts for disconnecting the speaker's circuit are connected in series with
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the contacts of the first headphone jack for disconnecting the speaker's circuit in conjunction
with the insertion of the headphone plug, and in parallel with the contacts of the second
headphone jack. Switch means is connected to the switch.
[0008]
In the first aspect of the present invention, even when the headphone plug is inserted, the sound
generation from the speaker can be turned on / off by the operation of the switch, and it is not
necessary to pull out the plug when sounding from the speaker.
In the second aspect of the invention, for example, in a group music class, high-power, lowimpedance signals can be drawn from the second headphone jack to the teaching instrument,
and operation of the switch can be performed even with the plug inserted. Can turn on / off the
sound from the speaker, eliminating the need to pull out the plug.
[0009]
An embodiment of the present invention will be described in detail with reference to the
drawings.
FIG. 2 is a block diagram showing the hardware configuration of an electronic musical
instrument to which the present invention is applied.
The CPU 1 controls the entire electronic musical instrument such as key assignment and sound
generation control. The ROM 2 stores data on control programs and timbres. The RAM 3 stores
various control data in the musical instrument or input automatic performance data and the like.
The panel 4 is composed of an operation switch, a volume, a display such as liquid crystal or LED,
and their interface circuit.
[0010]
The keyboard 5 comprises, for example, a keyboard and a keyboard scan circuit consisting of a
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plurality of keys each having two switches. The tone source circuit 6 reads waveform information
at an address interval corresponding to the pitch of the input performance information from, for
example, a waveform memory in which a waveform is stored in advance, generates a plurality of
digital musical tone signals, It is a circuit that synthesizes musical tone signals. The D / A
converter 7 D / A converts digital musical tone signals of the left and right channels, and the
sound system 8 is composed of a plurality of amplifiers and speakers and generates left and right
musical tones. A bus 9 connects circuits in the electronic musical instrument.
[0011]
FIG. 1 is a circuit diagram showing an example of a sound system to which the present invention
is applied. The same components as in FIG. 3 are assigned the same numbers. The configuration
of the amplifier side and the headphone unit 14 from the connector CN1 is the same as in FIG. In
this embodiment, the additional headphone unit 17 is connected between the connectors CN1
and CN2 of FIG. The additional headphone unit 17 includes a headphone jack J2, resistors R3
and R4, varistors SA3 and SA4, a connector CN3 and interlocked switches 22 and 23.
[0012]
Terminals 1 to 4 of the connector CN3, which are ground and output signal lines of the
amplifiers 10 and 11, are connected in parallel to the terminals 1 to 4 of the connector CN2. The
negative side terminal 6 of the left speaker 12 is connected to one end of a contact 20 and one
end of a switch 22 of the additional headphone jack J2 that opens in conjunction with insertion
of a headphone plug. The contact 20 and the other end of the switch 22 are both connected to
the sixth terminal of the connector CN2. Similarly, the negative terminal 5 of the right speaker 13
is connected to the fifth terminal of the connector CN2 via a parallel circuit of the contact 21 of
the jack J2 and the switch 23. The output signal of the amplifier is connected to the headphone
jack J2 via attenuation resistors R3 and R4.
[0013]
Next, usage will be described. The jack J1 can be used in the same manner as the conventional
one. Jack J2 can also be used as a headphone jack, and both jacks can be used simultaneously.
When the switches 22 and 23 are turned off, the speaker circuit is disconnected when the
headphone plug is inserted into one of the jacks. Furthermore, when a plug is inserted into the
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jack J2, the on / off of the speaker can be controlled by the switches 22 and 23. Therefore, when
the jack J2 is used as a headphone jack when used in a group music class, the speaker can be
turned on / off by the switches 22 and 23, and it is not necessary to insert and remove the plug.
Also, a high output, low impedance signal can be drawn from the second headphone jack to the
teacher instrument. In this case, if the switches 22 and 23 are always in the on state, it is not
necessary to insert and remove the plug for signal pull-in.
[0014]
Next, a second embodiment will be described. FIG. 4 is a circuit diagram of the additional
headphone unit 17 of the second embodiment. The difference from the unit 17 of FIG. 1 which is
the first embodiment is that the switches 22 and 23 are not connected in parallel to the contacts
20 and 21 of the headphone jack, respectively, but the terminals 6, 5 of the connector CN3 and
the ground It is a point connected between the lines 2 and 4. Next, switches 25 and 26 are
provided on the amplifier output signal line extending to the existing headphone unit 14. This
switch is turned on when the switches 22, 23 are off. Furthermore, variable resistors R5 and R6
are used instead of the damping resistors R3 and R4.
[0015]
In the first embodiment, when the jack J2 is used for pulling in to the teacher's instrument, the
headphones use the jack J1, and thus plugging and unplugging of the plug is required as in the
prior art, but the second embodiment In the example, with the above configuration, by switching
the switches 22 and 23, the speaker output can be turned on / off regardless of the states of both
jacks. Therefore, it is not necessary to insert and remove the headphone plug. Further, by
controlling the signal of the headphone jack J1 by the interlocked switches 25 and 26, for
example, there is no inconvenience such as not being aware of the sound being produced from
the speaker while the headphones are put on. Furthermore, the variable resistors R5 and R6
make it possible to adjust the level of the lead-in signal to the teaching instrument.
[0016]
As mentioned above, although the Example was described, the following modifications are also
considered. In the embodiment, although the example in which the additional headphone unit is
provided is disclosed, for example, the existing headphone unit 14 may only be provided with a
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switch for turning on / off the speaker output. Also, if the additional headphone unit is provided
exclusively for signal insertion into the teacher's instrument, the jack J2 of the additional unit
does not have contacts for disconnecting the speaker circuit in conjunction with the insertion of
the headphone plug, but merely draws out the signal. And a switch may be provided on the jack
J1. Furthermore, as for the attachment position, if the additional headphone unit is provided
exclusively for signal introduction to the teaching instrument, the jack may be provided at a less
prominent place such as the back or the underside of the instrument.
[0017]
The switch can be installed at any position, such as on the front surface, the side surface, the
bottom surface, or the panel, as long as the user can operate the switch. Also, although an
example using a manual one has been disclosed, for example, by using a relay, the control line of
the relay is connected to the teaching instrument, and by sending the control signal of the relay
from the teaching instrument, for a plurality of students. It is also possible to configure the relays
of the instruments to be controlled simultaneously or separately.
[0018]
As described above, in the first invention, even if the headphone plug is inserted, the sound
generation from the speaker can be turned on / off by the operation of the switch, and it is
necessary to pull out the plug when sounding from the speaker. In the second invention, high
power and low impedance signals can be drawn from the second headphone jack to the teaching
instrument, for example, in a group music class, and a plug for drawing in is inserted. Even if it
does not, the sound generation from the speaker can be turned on / off by the operation of the
switch, and there is an effect that it is not necessary to pull out the plug. Accordingly, extra
operations and time loss due to plug insertion and removal are reduced particularly in group
music classes, and smooth class progress is possible.
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