Electronic musical instrument, power control device thereof, power control method, recording medium

Abstract

This invention provides an electronic musical instrument, its power control device, power control method, and recording medium, which can utilize multiple power sources, including: a sound processing circuit for processing sound signals corresponding to the operation of playing components; an output jack for connecting the sound signals to an amplifier; a headphone jack for connecting the sound signals to headphones; a switch for turning the power of the electronic musical instrument on / off; and a control circuit that, based on: information indicating the power supply status of a first power source supplied from an AC adapter, a second power source supplied from a USB cable, and a third power source supplied from a battery; information indicating the presence or absence of the insertion of an output plug into an output jack, the insertion of a headphone plug into a headphone jack, the connection of a USB cable to a USB jack, and the on / off operation of the switch; and information indicating the on / off state of the power supply of the electronic musical instrument, determines whether power supply is required and selects the power source from the first, second, and third power sources for supply.

Description

Technical Field

[0001] This invention relates to an electronic musical instrument, as well as a power control device, power control method, and recording medium for the electronic musical instrument. Background Technology

[0002] Previously, there was a tuner that turned on by connecting a plug to a cable that was connected to a guitar (e.g., Patent Document 1).

[0003] [Existing Technical Documents]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2003-316352 Summary of the Invention

[0006] [The problem the invention aims to solve]

[0007] However, there has never been a concept in the past that electronic musical instruments have multiple power sources and can flexibly use power sources according to the situation.

[0008] The purpose of this invention is to provide an electronic musical instrument that can flexibly utilize multiple power sources and a power control device for the electronic musical instrument.

[0009] [Technical means to solve the problem]

[0010] One embodiment of the present invention is an electronic musical instrument, comprising:

[0011] Playback controls;

[0012] The music sound processing circuit processes the music sound signals corresponding to the operation of the playing operation device;

[0013] An output jack is used to connect the musical signal to the amplifier;

[0014] A phone jack is used for connecting the musical signals to the headphones;

[0015] A Universal Serial Bus (USB) jack for connecting a USB cable; a switch for turning the power on / off of the electronic instrument; and

[0016] The control circuit determines whether power supply is required and selects the power source from the first, second, and third powers based on: information indicating the power supply status of the first power supplied via an alternating current (AC) adapter, the second power supplied via a USB cable, and the third power supplied from a battery; information indicating the presence or absence of the insertion of the output plug into the output jack, the insertion of the headphone plug into the headphone jack, the connection of the USB cable into the USB jack, and the on / off operation of the switch; and information indicating the on / off state of the power supply of the electronic musical instrument.

[0017] In electronic musical instruments, the following structure can also be adopted: when the power supply of the electronic musical instrument is off, the control circuit detects any one of the following: the insertion of the output plug into the output jack, the insertion of the headphone plug into the headphone jack, the connection of the USB cable into the USB jack, and the opening operation of the switch, and supplies any one of the first power, the second power, and the third power to the music processing circuit according to the priority order.

[0018] Alternatively, in electronic musical instruments, the following structure can also be adopted: the control circuit selects the power supplied to the sound processing circuit in the order of the first power, the second power, and the third power.

[0019] Alternatively, in electronic musical instruments, the following structure can be adopted: in any of the following states—that the first power, the second power, and the third power can be supplied to the sound processing circuit, that the control circuit stops supplying power to the sound processing circuit when it detects the closing operation of the switch, or detects the output plug being pulled out of the output jack and the headphone plug being pulled out of the headphone jack.

[0020] Alternatively, in electronic musical instruments, the following structure can be adopted: when the second power and the third power can be supplied to the sound processing circuit, the control circuit stops supplying power to the sound processing circuit when it detects the closing operation of the switch.

[0021] Alternatively, in electronic musical instruments, the following structure can be adopted: when the second power can be supplied to the sound processing circuit, the control circuit stops supplying power to the sound processing circuit when it detects the closing operation of the switch or the cutting off of the USB cable from the USB port.

[0022] One embodiment of the present invention is a power control device for an electronic musical instrument, comprising a sound processing circuit for processing sound signals corresponding to the operation of a playing control, an output jack for connecting the sound signals to an amplifier, an earphone jack for connecting the sound signals to headphones, a USB jack for connecting a USB cable, and a switch for turning the power on / off of the electronic musical instrument. The power control device includes a control circuit that determines whether power supply is required based on: information indicating the power supply status of a first power supplied via an AC adapter, a second power supplied via a USB cable, and a third power supplied from a battery; information indicating the insertion of an output plug into the output jack, the insertion of an earphone plug into the earphone jack, the connection of the USB cable to the USB jack, and the presence or absence of the switch's on / off operation; and information indicating the on / off state of the electronic musical instrument's power supply. The control circuit then selects the power to be supplied from the first, second, and third power supplies.

[0023] One embodiment of the present invention is a power control method for an electronic musical instrument, the electronic musical instrument comprising: a musical sound processing circuit for processing musical sound signals corresponding to the operation of a playing operation component; an output jack for connecting the musical sound signals to an amplifier; an earphone jack for connecting the musical sound signals to headphones; a USB jack for connecting a USB cable; and a switch for turning the power of the electronic musical instrument on / off. The power control method for the electronic musical instrument determines whether power supply is required and selects power from the first power, the second power, and the third power based on: information indicating the power supply status of a first power supplied via an AC adapter, a second power supplied via a USB cable, and a third power supplied from a battery; information indicating the insertion of an output plug into the output jack, the insertion of an earphone plug into the earphone jack, the connection of the USB cable to the USB jack, and the on / off operation of the switch; and information indicating the on / off state of the power supply of the electronic musical instrument.

[0024] One embodiment of the present invention is a recording medium that records a program executed in a computer included in an electronic musical instrument. The electronic musical instrument includes: a musical sound processing circuit that processes musical sound signals corresponding to operations of playing components; an output jack for connecting the musical sound signals to an amplifier; an earphone jack for connecting the musical sound signals to headphones; a USB jack for connecting a USB cable; and a switch for turning the power supply of the electronic musical instrument on / off. The program determines whether power supply is required and selects power from the first, second, and third powers based on: information indicating the power supply status of a first power supplied via an AC adapter, a second power supplied via a USB cable, and a third power supplied from a battery; information indicating the insertion of an output plug into the output jack, the insertion of an earphone plug into the earphone jack, the connection of the USB cable to the USB jack, and the on / off operation of the switch; and information indicating the on / off state of the power supply of the electronic musical instrument. Attached Figure Description

[0025] Figure 1 An electric guitar representing an implementation method.

[0026] Figure 2 This describes the circuit structure of an electric guitar.

[0027] Figure 3 This is an explanatory diagram of the power control in an electric guitar (first embodiment).

[0028] Figure 4 This is a flowchart representing the processing instance of the main routine.

[0029] Figure 5 This is a flowchart illustrating an example of power selection control.

[0030] Figure 6 This is a table that indicates the specifications of the power selection circuit.

[0031] Figure 7 This is a flowchart illustrating an example of power-on / off switching control.

[0032] Figure 8 This is a diagram illustrating the second embodiment.

[0033] Figure 9 This is a flowchart illustrating a processing example in the power selection control of the second embodiment.

[0034] Figure 10 This is a flowchart illustrating a processing example in the power-on / off switching control of the second embodiment.

[0035] Figure 11 This is a table showing the specifications of the power selection circuit in the second embodiment.

[0036] [Explanation of Symbols]

[0037] 10: Guitar Amplifier

[0038] 11: CPU

[0039] 12: ROM

[0040] 13: RAM

[0041] 15: DSP

[0042] 30: Power Selection Circuit Detailed Implementation

[0043] Hereinafter, embodiments will be described with reference to the accompanying drawings. The structure of the embodiments is shown as an example and is not limited to the structure of the embodiments. Figure 1 An electronic guitar is shown as an embodiment. The electronic guitar 1 is an example of an electronic musical instrument, which may include electronic instruments other than electronic guitars. Like an electric guitar, the electronic guitar 1 includes: a body 1a, a neck 1b that engages with the body, and strings (playing operation components) 1c that are suspended from the body 1a across the neck 1b. The electronic guitar 1 has built-in circuitry that processes musical tone signals corresponding to the vibrations of the strings 1c caused by playing operations.

[0044] The electric guitar 1 has an output jack 21a that can be connected to the guitar amplifier 100. A musical signal is sent from the electric guitar 1 to the guitar amplifier 100, which amplifies the signal and produces a musical sound. Additionally, the electric guitar 1 has a headphone jack 21b, to which headphones or other headphones can be connected.

[0045] The electronic guitar 1 has multiple power supply lines for supplying operating power to the circuitry. Specifically, the electronic guitar 1 has a connector 6 that connects to an AC adapter 101 connected to a commercial power source (AC power), allowing it to receive power from the commercial power source (first power). Additionally, the electronic guitar 1 has a USB connector (USB port) 7 for connecting a USB cable 7a, via which it connects to a terminal 102, enabling communication with the terminal 102 (data transmission and reception, etc.). The terminal 102 can be a smartphone, tablet, personal computer, etc. Furthermore, the electronic guitar 1 can receive power via the USB cable 7a (second power). Moreover, the electronic guitar 1 may have a built-in battery 22c, allowing it to receive power from the battery 22c (third power).

[0046] Furthermore, the electric guitar 1 includes a switch 5 for turning the power of the electric guitar 1 on / off. Figure 1 In the illustration, to emphasize switch 5, it is shown protruding from the side of the electric guitar 1. However, in the recess 1d on the side of the electric guitar 1 (the side facing upwards when playing), it is almost not protruding, or is slightly recessed. This prevents switch 5 from being accidentally pressed.

[0047] Figure 2 This is a diagram illustrating an example of the circuit structure of an electric guitar 1. Figure 2 In this device, the electric guitar 1 includes a central processing unit (CPU) 11 that controls the overall operation. The CPU 11, which serves as the control circuit, is connected via bus 2 to a read-only memory (ROM) 12, a random access memory (RAM) 13, an operating unit 14, a digital signal processor (DSP) 15, a connection terminal 21, and a power supply terminal 22.

[0048] ROM 12 is used as a storage area for programs or data executed by CPU 11. RAM 13 is used as a working area of ​​CPU 11, a storage area for programs or data. RAM 13 and ROM 12 are examples of storage devices (storage media). The operating element 14 includes knobs, keys, buttons, switches, etc., for setting the electric guitar 1, and the power on / off switch 5 is also included in the operating element 14.

[0049] The connection terminal 21 includes: the output jack 21a and the headphone jack 21b, etc. The power terminal 22 includes: a connector 6 for the AC adapter 101, a USB jack (USB connector) 7, and a connection terminal for the battery 22c, etc.

[0050] The vibration of string 1c, which serves as the playing mechanism, is converted into an electrical signal by a vibration sensor (pickup) 16. This signal is then converted into a digital signal by an analog-to-digital (A / D) converter 17 and input to a DSP 15. The DSP 15 processes the digital signal (musical tone signal) according to the settings made by the CPU 11 and outputs the processed signal. The output signal is then output as a guitar musical tone signal from a digital-to-analog (D / A) converter 18. This guitar musical tone signal is connected to a guitar amplifier 100, amplified, and the musical tone based on the signal is emitted from a speaker included in the guitar amplifier 100.

[0051] Figure 3This diagram illustrates the power control of the electric guitar 1. The CPU 11 operates as a terminal monitoring unit 111, a power monitoring unit 112, and a control unit 113 by executing programs. The terminal monitoring unit 111 monitors the insertion and removal of the output plug to the output jack 21a (whether the guitar amplifier 100 is connected), the insertion and removal of the headphone plug to the headphone jack 21b (whether headphones are connected), and the on / off state of the power switch 5, etc.

[0052] The power monitoring unit 112 monitors the presence or absence of power supply from the AC adapter 101 (direct current, DC) power supply 22b), the USB power supply 22a from the USB cable 7a, and the battery 22c. This monitoring can be performed, for example, by measuring the potential at designated locations on the connector 6 and the USB connector 7, or by measuring the potential at the connection terminals of the battery 22c.

[0053] The control unit 113 performs power selection control 114 corresponding to the power supply status monitored by the power monitoring unit 112, and power on / off switching control 115 corresponding to the monitoring results of the terminal monitoring unit 111. Here, the electronic guitar 1 includes a power selection circuit 30, to which the power selection circuit 30 is input a signal IN1 indicating the presence or absence of DC power, a signal IN2 indicating the presence or absence of USB power 22a, and a signal IN3 indicating the presence or absence of battery 22c. The power selection control 114, corresponding to the monitoring results of the power monitoring unit 112, supplies control signals (PRI, CP2) indicating the type of power to be selected to the power selection circuit 30. The power selection circuit 30 is supplied with power and outputs a signal OUT indicating the type of power consistent with the control signal. The signal OUT is input to the power on / off switching circuit 40 included in the electronic guitar 1.

[0054] In the power on / off switching control 115, based on the monitoring results of the terminal monitoring unit 111, a control signal indicating whether the power of the electronic guitar 1 is on or off is input to the power on / off switching circuit 40. The power on / off switching circuit 40 turns the power of the electronic guitar 1 on / off according to the signal OUT and the control signal. When the power of the electronic guitar 1 is on, the power is consumed by the operation of the music processing unit 52.

[0055] Guitar string vibration input section 51 is Figure 2 The string 1c, vibration sensor 16, and A / D converter 17 are shown. The music processing unit 52 is... Figure 2 The DSP 15 shown is an example of a music tone processing circuit. The guitar music tone output unit 53 includes the D / A converter 18 and an output jack 21a.

[0056] Figure 4This indicates the processing instance of the main routine. In step S1, CPU 11 confirms the power status. In step S2, CPU 11 selects the power supply. In step S3, CPU 11 confirms the terminal type status. In step S4, the power is switched on / off.

[0057] Figure 5 This is a flowchart illustrating an example of power selection control. In step S01, it is determined whether a DC voltage is applied, i.e., whether there is a power supply from DC power source 22b. If it is determined that a DC voltage is applied, the process proceeds to step S04; otherwise, the process proceeds to step S02.

[0058] In step S02, it is determined whether a USB voltage is applied, that is, whether there is a power supply from the USB power source 22a. If it is determined that a USB voltage is applied, the process proceeds to step S05; otherwise, the process proceeds to step S03.

[0059] In step S03, it is determined whether a battery voltage is applied, that is, whether there is a power supply from battery 22c. If it is determined that a battery voltage is applied, the process proceeds to step S06; otherwise, the process ends.

[0060] In step S04, CPU 11 sets the value of flag "PRI" to "0" and the value of flag "CP2" to "1", then ends the process. In step S05, CPU 11 sets the value of flag "PRI" to "1" and the value of flag "CP2" to "0", then ends the process. In step S06, CPU 11 sets the value of flag "PRI" to "0" and the value of flag "CP2" to "0", then ends the process. The values ​​of flags PRI and CP2 are supplied to the power selection circuit 30 for power selection.

[0061] Figure 6 This is a table indicating the specifications of the power selection circuit, and showing the relationship between the values ​​of flags PRI and CP2 and the signal OUT output from the output terminal of the power selection circuit 30. When flags PRI and CP2 are "0" and "1" respectively, IN1, indicating power supply from DC power supply 22b, is input to the power selection circuit 30. In this case, the output OUT of the power selection circuit 30 becomes IN1, and the DC power supply (AC adapter 101) is selected as the power supply source, thereby selecting to connect the DC power supply to the music processing unit 52.

[0062] When the flags PRI and CP2 are "1" and "0" respectively, IN2, indicating power supply from USB power supply 22a, is input to the power selection circuit 30. In this case, the output OUT of the power selection circuit 30 becomes IN2, selecting USB power supply 22a as the power source, thereby selecting to connect USB power supply 22b to the music processing unit 52.

[0063] When flags PRI and CP2 are "0" and "0" respectively, IN3, indicating the power supply from battery 22c, is input to the power selection circuit 30. In this case, the output OUT of the power selection circuit 30 becomes IN3, selecting battery 22c as the power supply source, thereby selecting to connect battery 22c to the music processing unit 52.

[0064] Figure 7 This is a flowchart illustrating an example of power-on / off switching control. In step S11, CPU 11 determines whether the plug of the connection cable to the guitar amplifier 100 is inserted into the output jack 21a. If it is determined that the plug is inserted, the process proceeds to step S15; otherwise, the process proceeds to step S12.

[0065] In step S12, the CPU 11 determines whether the plug of headphones, etc., has been inserted into the headphone jack 21b. If it is determined that the plug has been inserted, the process proceeds to step S15; otherwise, the process proceeds to step S13.

[0066] In step S13, CPU 11 determines whether the male connector of USB cable 7a has been inserted into USB connector 7. If it is determined that the connector has been inserted, the process proceeds to step S15; otherwise, the process proceeds to step S14.

[0067] In step S14, CPU 11 sets the value of the power on / off flag "PON" to "0". In step S15, CPU 11 sets the value of the power on / off flag "PON" to "1". In step S16, it is determined whether the power switch 5 (POWERSW) is being pressed and held. If it is determined that the power switch 5 is being pressed and held, the process proceeds to step S17; otherwise, the process ends.

[0068] In step S17, if the value of PON is "1", then CPU 11 sets the value of PON to 0; if the value of PON is "0", then CPU 11 sets the value of PON to "1". PON "1" indicates that the power is on, and PON "0" indicates that the power is off. Step S17 means that if the power switch 5 is pressed and held while the power is off, the power of the electronic guitar 1 will be turned on; if the power switch 5 is pressed and held while the power is on, the power of the electronic guitar 1 will be turned off. By pressing and holding the power switch, incorrect power on / off switching is avoided.

[0069] When the PON value is "1", the power supply switch 40 connects the power source specified by the OUT value to the music processing unit 52. When the PON value is "0", the power supply to the electronic guitar 1 is turned off, stopping the power supply to the music processing unit 52.

[0070] The terminal monitoring unit 111 can be implemented by a logic circuit or switching mechanism that outputs voltage values ​​corresponding to each state, or by a CPU identical to the CPU 11 connected to the general-purpose port for power selection control 114 to implement each state. The power monitoring unit 112 transmits information corresponding to the voltage state of each power supply to the power on / off switching control 115. The power monitoring unit 112 can be implemented by a logic circuit that outputs voltages corresponding to each state, or by a CPU identical to the CPU connected to the general-purpose port for power on / off switching control to implement each state.

[0071] Figures 8-11 Indicates and Figures 3-7 The second embodiment differs from the first embodiment shown. Figure 8 As shown, the second embodiment differs from the first embodiment in the following aspects ( Figure 3 This is different. The USB power supply is not installed under the control of the power-on / off switching circuit 40. Therefore, when the USB cable 7a is connected to the USB connector 7 without using a power source other than the USB power supply, the power selection circuit 30 processes it as power-on without going through the power-on / off switching control 115. The power selection circuit 30 selects the USB power supply. Therefore, the user can turn on the electronic guitar 1 simply by connecting the USB cable 7a, and the electronic guitar can be used immediately.

[0072] Figure 9 This is a flowchart illustrating an example of power selection control in the second embodiment. Figure 9The processing of steps S01, S02, and S03 is the same as in the first embodiment. However, in steps S24, S25, and S26, which correspond to steps S04, S05, and S06, the following processing is performed: In step S24, the value of the power selection flag PRI is set to 0. In step S25, the value of the power selection flag PRI is set to 1. In step S24, the value of the power selection flag PRI is set to 0.

[0073] Figure 10 This is a flowchart illustrating an example of power-on / off switching control in the second embodiment. It is the same as the first embodiment except that step S13 is removed from the processes of steps S11 to S17 in the first embodiment. In the second embodiment, the PON setting process (determining whether a connection is needed) accompanying insertion into the USB connector is not performed.

[0074] Figure 11 This table shows the specifications of the power selection circuit 30 in the second embodiment. When PRI "0" is output as a result of the power selection control 114, IN1, indicating the DC power supply 22b or battery 22c as the power source, is input from the power on / off switching circuit 40 to the power selection circuit 30, and IN1 is output as OUT. Thus, the DC power supply 22b or battery 22c is connected to the music processing unit 52. When PRI "1" is output, IN2, indicating the USB power supply 22a, is input to the power selection circuit 30, and IN2 is output as OUT. Therefore, the USB power supply 22a is connected to the music processing unit 52. The priority order of power selection remains unchanged from the first embodiment (DC > USB > battery).

[0075] The electronic guitar 1 of the embodiment includes: a DSP (sound processing unit 52: sound processing circuit) for processing sound signals corresponding to the operation of the string 1c (playing operation element); an output jack 21a for connecting the sound signals to the guitar amplifier 100; a headphone jack 21b for connecting the sound signals to the headphones 103; a USB connector 7 for connecting a USB cable 7a; and a switch 5 for turning the power of the electronic guitar 1 on / off. The CPU 11, which is the control device of the electronic guitar 1, determines whether power supply is needed and selects the power supply from the first power, the second power and the third power based on: information indicating the power receiving status of the first power supplied via the AC adapter 101, the second power supplied via the USB cable 7a, and the third power supplied from the battery 23c; information indicating the presence or absence of the output plug being inserted into the output jack 21a, the headphone plug being inserted into the headphone jack 21b, the USB cable 7a being connected to the USB connector 7 (USB jack), and the on / off operation of the switch 5; and information indicating the on / off state of the power supply of the electronic guitar 1.

[0076] The power source of the electronic guitar 1 can be switched according to various situations, such as home practice, recording, and live performance. Furthermore, multiple power-on methods are available, including connecting to the output jack, the headphone jack, the USB port, or turning on the power switch. Even without unplugging any cables, the power can be turned off using the power switch 5 located on the side of the electronic guitar 1. Notably, in conventional products using USB bus power, the USB cable must be unplugged to turn off the power, but this invention eliminates this need.

[0077] For the electric guitar 1, consider the following usage scenarios.

[0078] <Use Scenario 1>

[0079] (1) Use USB power to use the electric guitar 1.

[0080] (2) After use, press and hold switch 5 to turn the power off.

[0081] (3) When using it again, press and hold switch 5 to turn the power on.

[0082] In this way, with terminal 102 turned on and the USB cable 7a connected, only the power to the electronic guitar 1 can be turned off.

[0083] <Usage Scenario 2>

[0084] (1) and (2) are the same.

[0085] (3) Then, unplug the USB cable 7a to put the electronic guitar 1 into the guitar case.

[0086] (4) When using it again, as long as the USB cable 7a is connected, the electronic guitar 1 can be turned on again without pressing and holding the switch 5.

[0087] Thus, while conventional mechanical power switches require turning off during tidying up, this is unnecessary in the electric guitar 1. The structures shown in the embodiment can be appropriately combined without departing from the intended purpose.

Claims

1. An electronic musical instrument, characterized in that, include: Playback controls; The music sound processing circuit processes the music sound signals corresponding to the operation of the playing operation device; An output jack is used to connect the musical signal to the amplifier; A headphone jack for connecting the musical signal to headphones; Universal Serial Bus (USB) jack, used to connect Universal Serial Bus (USB) cables; A switch for turning the power on / off of the electronic musical instrument; as well as Control circuit, based on: Information indicating the power supply status of the first power supplied via the AC adapter, the second power supplied via the Universal Serial Bus cable, and the third power supplied from the battery. Information indicating the presence or absence of each of the following: insertion of the output plug into the output jack, insertion of the headphone plug into the headphone jack, connection of the Universal Serial Bus cable into the Universal Serial Bus jack, and on / off operation of the switch. Information indicating the on / off state of the power supply of the electronic musical instrument. The system determines whether an electricity supply is needed and selects the electricity to be supplied from the first, second, and third power sources.

2. The electronic musical instrument according to claim 1, characterized in that, When the control circuit detects any of the following when the power supply of the electronic musical instrument is off: the insertion of the output plug into the output jack, the insertion of the headphone plug into the headphone jack, the connection of the Universal Serial Bus cable into the Universal Serial Bus jack, or the opening operation of the switch, it supplies any one of the first power, the second power, and the third power to the music processing circuit according to priority.

3. The electronic musical instrument according to claim 1, characterized in that, The control circuit selects the power supplied to the music processing circuit in the order of the first power, the second power, and the third power.

4. The electronic musical instrument according to claim 2, characterized in that, The control circuit selects the power supplied to the music processing circuit in the order of the first power, the second power, and the third power.

5. The electronic musical instrument according to any one of claims 1 to 4, characterized in that, In each of the following states: capable of supplying the first power, the second power, and the third power to the music processing circuit; capable of supplying the first power and the third power to the music processing circuit; capable of supplying the first power and the second power to the music processing circuit; capable of supplying the third power to the music processing circuit; and capable of supplying the first power to the music processing circuit, ... The control circuit stops supplying power to the music processing circuit when it detects the switch being turned off, or when it detects the output plug being pulled out of the output jack and the headphone plug being pulled out of the headphone jack.

6. The electronic musical instrument according to any one of claims 1 to 4, characterized in that, In a state where the second power and the third power can be supplied to the music processing circuit, When the control circuit detects that the switch has been closed, it stops supplying power to the music processing circuit.

7. The electronic musical instrument according to any one of claims 1 to 4, characterized in that, In a state where the second power can be supplied to the music processing circuit, The control circuit stops supplying power to the music processing circuit when it detects the switch being turned off or the Universal Serial Bus cable being cut off from the Universal Serial Bus jack.

8. A power control device for an electronic musical instrument, comprising a sound processing circuit for processing sound signals corresponding to operations of playing operation elements, an output jack for connecting the sound signals to an amplifier, an earphone jack for connecting the sound signals to headphones, a universal serial bus jack for connecting a universal serial bus cable, and a switch for turning the power of the electronic musical instrument on / off, characterized in that, The power control device of the electronic musical instrument includes a control circuit. The control circuit is based on: Information indicating the power supply status of the first power supplied via the AC adapter, the second power supplied via the Universal Serial Bus cable, and the third power supplied from the battery. Information indicating the presence or absence of each of the following: insertion of the output plug into the output jack, insertion of the headphone plug into the headphone jack, connection of the Universal Serial Bus cable into the Universal Serial Bus jack, and on / off operation of the switch. Information indicating the on / off state of the power supply of the electronic musical instrument. The system determines whether an electricity supply is needed and selects the electricity to be supplied from the first, second, and third power sources.

9. A power control method for an electronic musical instrument, wherein the power control device for the electronic musical instrument comprises: The electronic musical instrument's power control method is characterized by a music processing circuit that processes music signals corresponding to the operation of the playing controls, an output jack for connecting the music signals to an amplifier, an earphone jack for connecting the music signals to headphones, a Universal Serial Bus (USB) jack for connecting a USB cable, and a switch for turning the power on / off of the electronic musical instrument. The power control method of the electronic musical instrument is based on: Information indicating the power supply status of the first power supplied via the AC adapter, the second power supplied via the Universal Serial Bus cable, and the third power supplied from the battery. Information indicating the presence or absence of each of the following: insertion of the output plug into the output jack, insertion of the headphone plug into the headphone jack, connection of the Universal Serial Bus cable into the Universal Serial Bus jack, and on / off operation of the switch. Information indicating the on / off state of the power supply of the electronic musical instrument. The system determines whether an electricity supply is needed and selects the electricity to be supplied from the first, second, and third power sources.

10. A recording medium for recording a program executed in a computer included in an electronic musical instrument, said electronic musical instrument comprising: The recording medium is characterized by a sound processing circuit for processing sound signals corresponding to the operation of the playing control, an output jack for connecting the sound signals to an amplifier, an earphone jack for connecting the sound signals to headphones, a Universal Serial Bus jack for connecting a Universal Serial Bus cable, and a switch for turning the power of the electronic instrument on / off. The procedure is based on: Information indicating the power supply status of the first power supplied via the AC adapter, the second power supplied via the Universal Serial Bus cable, and the third power supplied from the battery. Information indicating the presence or absence of each of the following: insertion of the output plug into the output jack, insertion of the headphone plug into the headphone jack, connection of the Universal Serial Bus cable into the Universal Serial Bus jack, and on / off operation of the switch. Information indicating the on / off state of the power supply of the electronic musical instrument. The system determines whether an electricity supply is needed and selects the electricity to be supplied from the first, second, and third power sources.

Images