JP2847996B2 - Power supply for electronic musical instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for an electronic musical instrument that can be selectively driven by either an internal power supply or an external power supply. Is a power supply device having a function of automatically shutting off the supply of power to the electronic musical instrument when a state where no occurrence of the electronic musical instrument continues for a predetermined time or more is provided. The present invention relates to an apparatus capable of appropriately shutting off a power supply depending on whether there is a power supply or an external power supply.

[0002]

2. Description of the Related Art As an electronic musical instrument such as an electronic piano, a non-operation state in which no performance operation such as key depression of a keyboard is performed when a power switch is turned on in order to prevent useless power consumption. In some cases, the power supply is automatically cut off (auto power off) when the power supply has continued for a predetermined time or more. In such an electronic musical instrument, an automatic power-off function is operated regardless of whether the electronic musical instrument is driven by an external AC power supply or an internal battery power supply.

[0003]

However, as in the above-described conventional electronic musical instrument, when the non-operation state continues for a predetermined time or longer, regardless of whether the drive power supply is an AC power supply or a battery power supply. When the auto power off works, inconvenience due to improper auto power off often occurs in the following cases in which an AC power supply is generally used.

That is, for example, in a case where a performance is performed using a plurality of keyboards in combination, even though a non-operation state for a predetermined time or more is likely to occur in any particular keyboard, an automatic operation is performed each time. As a result of the power-off, the desired performance could not be performed. In addition, even when the electronic musical instrument is displayed in a shop where a test performance is possible, a test performance by a customer or the like is not performed frequently. As a result of the automatic power-off operation every time, a test performance could not be performed at any time.

[0005] The present invention has been made in view of the above-mentioned point, and appropriately reduces power consumption depending on whether an electronic musical instrument is supplied with an internal power supply or an external power supply. An object of the present invention is to provide a power supply device for an electronic musical instrument, which is capable of shutting off power.

[0006]

Means for Solving the Problems A power supply device for an electronic musical instrument according to the present invention includes an internal power supply provided inside the electronic musical instrument, an external power supply introducing means for introducing an external power supply, and the internal power supply. Power supply means for selectively supplying one of the external power supplies introduced by the external power supply means, and outputting an external power supply detection signal in response to the external power supply being supplied by the power supply means an external power supply detecting means for, and a control circuit that performs in accordance with the processing programs for controlling the operation of the electronic musical instrument, and event information detecting process for detecting the presence or absence of occurrence of the performance event information, the occurrence chromatic performance event information A process for executing a predetermined performance operation control, a process for determining whether or not a state in which performance event information has not been generated has continued for a predetermined time or more; If the occurrence of the event information is no state not reporting an external power supply detection signal from continuous and said external power supply detecting means for a predetermined time or more, constitute the program to perform a process for generating a power cutoff instruction Power on according to the operator's operation.
Power switch to be controlled, selected by the power supply means
Power supplied to the control circuit and each part of the electronic musical instrument
Is controlled according to the operation of the power switch.
And in response to a power-off command from the control circuit.
A power on / off control circuit for controlling so as to cut off power supply to each part of the electronic musical instrument .

[0007]

The power supply means selectively supplies an internal power supply provided inside the electronic musical instrument or an external power supply introduced by an external power supply introduction means for introducing an external power supply. When the external power is supplied by the power supply unit, an external power supply detection signal is output from the external power supply detection unit in response to the external power supply. On the other hand, in the control circuit for executing a process of controlling the operation of the electronic musical instrument in accordance with the program, and event information detecting process for detecting the presence or absence of occurrence of the performance event information, the predetermined performance operations control when generating chromatic performance event information In addition to executing the processing to be executed, the processing for determining whether or not the state in which no performance event information has occurred has continued for a predetermined time or more, and the state in which no performance event information has occurred has continued for a predetermined time or more if the external power supply detection signal from the life-and-death said external power supply detecting means is not outputted, the program is configured to perform processing for generating a power-off instruction. one
Power switch to control the power on according to the operator's operation.
Switch is provided, and in the power on / off control circuit,
The power selectively supplied by the power supply means;
The power supply to each part of the electronic musical instrument including the control circuit
Control in accordance with the operation of the power switch and the control circuit.
Electronic music including the control circuit in response to a power supply cutoff command from a road.
Control to cut off the power supply to each part of the vessel . In this way, it is detected whether or not the external power is being supplied to the electronic musical instrument. If the external power is not supplied, that is, if the internal power is supplied, the performance event information is detected. When the state where no occurrence occurs continues for a predetermined time or more, the power is cut off to save power. Thus, while the internal power supply can be prevented from being consumed, when an external power supply is used as the drive power supply for the electronic musical instrument, it is possible to prevent inappropriate automatic power-off. Since the control circuit operates with the power supply controlled in this way, there is no inconvenience that the internal power supply is used in the control circuit in parallel with the use of the external power supply. The saving effect can be further enhanced. Further, according to the present invention, the processing for controlling the operation of the electronic musical instrument is performed by a control circuit that executes according to a program, that is, a computer circuit such as a microcomputer.
With this control circuit, if only the original processing of an electronic musical instrument, that is, the event information detection processing for detecting the presence / absence of performance event information and the processing for executing a predetermined performance operation control when the performance event information is generated, is performed, A process of determining whether or not a state in which performance event information has not occurred has continued for a predetermined time or more, and further, a state in which no performance event information has occurred has continued for a predetermined time or more, and if the external power supply detection signal is not output, and characterized by being obtained by configuring the program to perform the processing for generating a power-off instruction.
Therefore, the power supply cutoff control process is performed by sharing a control circuit for performing various performance operation control processes based on the generation of performance event information without adding a special control circuit for the power supply cutoff control process. The power cutoff control process can be performed with an extremely simple circuit configuration. Further, according to the present invention, an electronic musical instrument including a control circuit is provided.
Power on / off control to control the power supply to each part of the vessel
Power supply control based on manual operation of power switch
(Manual control) and a power-off command from the control circuit.
Control (automatic control)
Therefore, one power on / off control circuit is
Power control.
The control circuit operates substantially between the internal power supply and the external power supply.
It will be in operation and will be used for power on / off control.
Excellent effect that the circuit configuration can be simplified
To play .

The power supply apparatus may further include a selection unit for selecting whether or not to execute the power supply cutoff command generation processing. Thereby, the power cutoff function can be more appropriately operated. The performance event information to be detected by the event information detection processing includes information indicating an operation event on a keyboard, an operation panel, or the like of an electronic musical instrument, information indicating a tone generation event by a sequencer or an automatic accompaniment, or MIDI. Information indicating an input event of performance information input from the outside via a terminal may be used.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing an overall configuration of an electronic musical instrument using a power supply device according to one embodiment of the present invention. In the electronic musical instrument main circuit 1, the microcomputer 2 controls the entire electronic musical instrument and has a built-in timer for performing various processes. This microcomputer 2, as described later,
When the power supply to the electronic musical instrument main circuit 1 is started and a reset pulse is input to the reset input, a signal having a logical level "1" is output from the output port. The microcomputer 2 includes a keyboard circuit 3,
The panel circuit 4, the sound source circuit 5, and the like are connected. The keyboard circuit 3 includes a plurality of key switches provided in correspondence with a keyboard KB having a plurality of keys for designating a pitch of a musical tone to be generated, and corresponds to a change from a released key to a pressed key. To output a key-on event signal, a key-off event signal in response to a change from key depression to key release, and a key code indicating a key corresponding to each of the key events.
The panel circuit 4 controls the tone color, volume, pitch,
It is provided corresponding to various operators provided on the operation panel 6 for setting, selecting or controlling effects and the like, and outputs operation data according to the operation status of each of the operators. The tone generator 5 can generate a tone signal on each of a plurality of channels based on various data such as the key code, the key-on event signal, and operation data. The tone signal generated by the tone generator circuit 5 is subjected to D / A conversion.
The sound is generated acoustically via the sound system SS. The power supply circuit A can selectively supply the main circuit 1 with either a battery power supply 8 as an internal power supply provided inside the electronic musical instrument or an AC power supply 9 as an external power supply. It has become. That is, in the power supply circuit A, when the load connection plug 11 of the power adapter 10 that enables introduction of an AC power supply is not connected to the jack connection section 12, the battery power contact 13 of the jack connection section 12 is closed. The battery power supply 8 and the electronic musical instrument main circuit 1 are connected (conductive) via the backflow prevention diode 14 and a power supply on / off control circuit 15 described later, and the power of the battery power supply 8 can be supplied. . When an AC power supply is used as the driving power supply, the outlet plug 16 of the power adapter 10 is connected to the AC power supply, and the load connection plug 11 is connected to the jack connection section 12. When the load connection plug 11 is connected to the jack connection portion 12 as described above,
Instead of the battery power contact 13 being opened and an intermittent (non-conductive) state between the battery power supply 8 and the electronic musical instrument main circuit 1, the power adapter 10 and the noise removing capacitor 1
8. The connection between the AC power supply and the electronic musical instrument main circuit 1 is established via the backflow prevention diode 19, the voltage stabilizing capacitor 20, and the power supply ON / OFF control circuit 10, so that the AC power supply can be supplied.

The momentary power switch 21 is a power-on switch for starting the power supply from the battery power supply 8 or the AC power supply to the electronic musical instrument main circuit 1. When the switch is turned on, the power supply of the logical level "1" starts. The signal PON is output to the first detection circuit 22. After the power supply start signal PON is output, the signal detection circuit 22 turns itself off.

The first detection circuit 22 is connected to a point B between the control circuit 15 and the voltage stabilizing capacitor 20 on a power supply line. Each time the detection circuit 22 detects the ON state of the switch 21 based on the input of the power supply start signal PON, the power supply of the battery power supply 8 or the AC power supply is supplied to the electronic musical instrument main circuit 1 for the power supply ON / OFF control circuit 15. A power supply on / off control circuit 15 that outputs a temporary supply instruction signal FI for instructing a temporary supply and provides an interrupt signal INT to the microcomputer 2 after a certain period of time when the microcomputer 2 becomes operable. It outputs a temporary supply instruction signal FI for instructing the electronic musical instrument main circuit 1 to temporarily supply the power of the battery power supply 8 or the AC power supply.

The power supply on / off control circuit 15 comprises a transistor switch or the like. The power supply 8 or 9 and the electronic musical instrument main circuit depend on the detection state of the first detection circuit 22 and the state of the output port of the microcomputer 2. 1 is connected or intermittent. More specifically, the control circuit 15
When the momentary power switch 21 is turned on, the first
When the temporary supply instruction signal FI is input from the detection circuit 22 of the above, the power supply 8 or 9 and the electronic musical instrument main circuit 1 are temporarily connected, and the power supply 8 or 9 supplies the electronic musical instrument main circuit 1 with Provide a temporary power supply. In this manner, the reset signal generator RG connected to the point C between the power supply on / off control circuit 15 and the electronic musical instrument main circuit 1 on the power supply line provides a temporary connection to the electronic musical instrument main circuit 1 as described above. When power is supplied
By detecting the rise of the voltage at the point, a reset pulse RP is generated at a predetermined timing, and this reset pulse RP is given to the reset input of the microcomputer 2. By inputting such a reset pulse RS, a signal of logic level “1” is output from the output port of the microcomputer 2 to the power on / off control circuit 15. The control circuit 15 turns on the transistor switch by inputting the signal of “1” from the output port of the microcomputer 2, and thereafter, unless a signal of logic level “0” is input from the output port, The power supply 8 or 9 and the electronic musical instrument main circuit 1 are kept in a connected state to enable continuous power supply from the power supply 8 or 9 to the electronic musical instrument main circuit 1.

The second detecting circuit 24 is connected to a point A between the noise removing capacitor 18 and the backflow preventing diode 18 on the power supply line. This detection circuit 24
Detects the voltage at the point A, and when the voltage is equal to or higher than a predetermined threshold, the logic level "1" indicating that AC power is supplied by connecting the power adapter 10
To the input port of the microcomputer 2 to set the state of the input port to "1".

In this manner, the microcomputer 2
Determines that AC power is being supplied from the power supply circuit A based on the "1" detection signal from the second detection circuit 24. As a result, the power of the battery power supply 8 is supplied to the electronic musical instrument main circuit 1. When the power is supplied, the automatic power-off is executed, and when the power of the AC power supply 9 is supplied, a process for preventing the automatic power-off from being executed is performed. Such processing will be described later in detail.

The main registers in the microcomputer 2 in this embodiment are as follows. Key code register KCD: Stores a key code indicating a key that has been newly depressed or released on the keyboard KB, that is, a key having an event. Operator number register SBUF: Stores an operator number of an operator newly operated on the operation panel 6, that is, an operator having an event. Power-off timer register OFT: Stores a waiting time WT set in advance as a grace period from the start of a no-operation (no-event) state on the keyboard KB and the operation panel 6 to execution of an automatic power-off for the electronic musical instrument. I do. Timer register TR: incremented by one each time the timer interrupt processing of FIG. 7 is executed.

Next, an example of processing executed by the microcomputer 2 will be described with reference to flowcharts shown in FIGS. Momentary power switch 2
By starting the power supply by turning on 1
When the interrupt signal INT is supplied from the first detection circuit 22, the microcomputer performs an interrupt routine shown in FIG. In this routine, after waiting a predetermined time for the reset pulse RP generated from the reset pulse generator RG to be input, it is determined whether or not the reset pulse RP has been input (step 30). If the determination result is YES, a predetermined microcomputer reset process is performed (step 31), "1" is set to the output port (step 32), and the main routine shown in FIG. 3 is started (step 33). . If NO in step 30, that is, if it is determined that the reset pulse RP has not been input, the output port is set to “0” (step 34), and the process waits for a further predetermined time (step 35). These steps 34 and 35 are repeated until the reset pulse RP is input.

In the main routine shown in FIG. 3, after performing a predetermined initial setting, a routine of a keyboard process, a panel process, and a timer process is repeated. In the keyboard processing, each key switch in the keyboard circuit 3 is scanned and turned on / off.
A process of detecting OFF and assigning a pressed key to any of a plurality of sound channels is performed. The processing executed in the keyboard processing includes a key-on event processing and a key-off event processing, each of which is an example in each of FIGS. This key-on event process is a process executed when it is detected that any key on the keyboard KB has been newly pressed, and the key-off event process is a process performed when any key on the keyboard KB is newly pressed. This is a process executed when it is detected that a key release has been performed. In the panel processing, various controls and switches on the operation panel 6 are scanned and turned on / off.
Off is detected, and various processes are performed based on the detection. One of the processes executed in this panel process is a panel operator ON event process shown in FIG. 6 as an example. In this panel operator ON event process, one of the operators on the operation panel 6 is newly activated. This is a process executed when it is detected that an operation has been performed. As one of the processes executed in the timer process, there is a timer process whose example is shown in FIG. Further, the microcomputer 2 performs the timer interrupt processing of FIG. 7 during execution of the main routine, and in this timer interrupt processing, the timer register T
A process of adding 1 to the value of C is performed.

In the key-on event processing of FIG.
The key code indicating the newly pressed key is stored in the key code register KCD. Next, the newly pressed key is assigned to one of the tone generation channels of the tone generator circuit 5, and the tone generator circuit 5 is instructed to emit a tone signal having a pitch corresponding to the key code of the key code register KCD. . Then, the waiting time WT until the execution of the automatic power-off is set in the power-off timer register OFT.

In the key-off event process shown in FIG.
The key code indicating the newly released key is stored in the key code register KCD. Next, a search is made for a sounding channel which is generating a tone signal having a pitch corresponding to the key code stored in the key code register KCD, and if there is such a channel, release processing of the sound (attenuation processing at key release) is performed. Tell them to start. Then, the wait time WT is set in the power-off timer register OFT.

In the panel operator ON event process of FIG. 6, the value of the operator number of the newly operated operator is stored in the operator number register SBUF. Next, a panel processing routine corresponding to the numerical value stored in the operator number register SBUF is called. The panel processing routines called in this way include tone selection processing, on / off processing of various effects, effect selection processing, rhythm on / off processing, automatic accompaniment on / off processing, style selection processing, volume adjustment processing, etc. There are routines. Then, the waiting time WT is set in the power-off timer register OFT.

In each of the key-on event processing, the key-off event processing, and the panel operator ON event processing, the wait time WT until the execution of the auto power-off is set in the power-off timer register OFT in the electronic musical instrument. This is so that the waiting time WT is updated every time a new key press, key release operation or operator operation is performed, that is, every time there is an operation event.

In the timer process of FIG. 8, it is determined whether the value of the timer register TR is 1 or more (TR ≧ 1) (step 36). If the result of this determination is NO, no further processing is performed thereafter. Also, if the result of this determination is Y
In the case of ES, 1 is subtracted from the value of the timer register TR (step 37). The reason why 1 is subtracted from the value of the timer register TR in step 37 is to enable the subsequent processing to be performed at the time interval of the timer interrupt processing in FIG. More specifically, since this timer processing executed at a time interval of the main routine of the microcomputer 2 is executed at a shorter time interval than the timer interrupt processing, by subtracting 1 from the value of the timer register TR in this manner, In a normal case, the result of the determination in step 36 is NO (TR = 0), and the subsequent processing is not performed. Therefore, the processing after step 37 is executed only when the timer interrupt processing is performed. It will be.

After subtracting 1 from the value of the timer register TR as described above, other necessary timer processing is performed (step 38), and then the waiting time WT set in the power-off timer register OFT is calculated. It is determined whether the value is 0 or whether there is any event on the keyboard KB or the operation panel 6 (step 3).
9). When the result of this determination is YES, this timer process ends without performing the subsequent processes. When the determination result is NO, the word-off timer register OFT
After the last wait time WT is set, the no-operation event state in which no operation event occurs on the keyboard KB or the operation panel 6 has occurred. Therefore, the set wait time WT is set to one. To count down, 1 is subtracted from the value of the power-off timer register OFT (step 40), and then it is determined whether or not the value of the power-off timer register OFT is 0 (step 41). If the result of this determination is NO, it means that the set waiting time WT has not expired, and thus this timer processing is terminated. On the other hand, when the result of this determination is YES, it is further determined whether the state of the input port is "1" (step 42). If the decision result in the step 42 is NO, the battery power supply 8
Is supplied, the waiting time WT has expired, and the output port is set to "0" to perform automatic power-off of the battery power supply 8 (step 4).
3) Wait for a predetermined time (step 44). These steps 43 and 44 are repeated until the power supply from the battery power supply 8 is completely shut off with a delay of a time constant defined by the capacitor. In this way, the power supply from the battery power supply 8 is cut off. On the other hand, if the decision result in the step 42 is YES, the wait time WT has expired while the power is supplied from the AC power supply 9, and in this case, the timer processing is performed without performing the subsequent processing. To end.
In this way, the interruption of the power when the power is supplied from the AC power supply 9 is prohibited.

As described above, the timer processing for automatically shutting off the battery power supply 8 when the no-event state occurs for a predetermined time or more while using the battery power supply 8 is completed. It is to be noted that the determination as to whether or not the OFT is 0 in the above step 39, and the determination result is NO, the subsequent processing is not performed because the waiting time WT is not set from the beginning. And the result of subtracting 1 from the value of the power-off timer register OFT in step 40 of the previous timer processing, the value of the register OFT is initially 0,
This is because consideration has been given to a case where there is no need to perform subsequent processing.

Next, an example of the operation of the power supply device according to the above embodiment will be described. First, the case where the battery power supply 8 as the internal power supply is supplied to the electronic musical instrument will be described. First, when the momentary power switch 21 is turned on, a reset pulse RP is given from the reset signal generator RG to the microcomputer 2, and the microcomputer 2 sends a “1” signal to the power on / off control circuit 15 from the output port. Output. In response to this signal, the power on / off control circuit 15 starts continuous supply of power from the battery power supply 8 to the electronic musical instrument main circuit 1. This allows the electronic musical instrument to be operated and the microcomputer 2 to operate as shown in FIG. Starts the main routine. Thereafter, when the keyboard KB or the operation panel 6 is operated, the microcomputer 2 executes the event processing shown in FIGS. 4 to 6 each time, and sets the predetermined waiting time WT to the power-off timer register. It will be set to OFT. Last wait time W
After T is set, if no operation event state occurs on the keyboard KB or the operation panel 6 without any operation event, the microcomputer 2 causes
By executing step 39 of the above, that effect is detected, and by executing step 40, the countdown of the waiting time WT is started. Then, when the waiting time WT expires, by executing steps 42, 43, and 44,
The power supply from the battery power supply 8 is cut off.

On the other hand, when an AC power supply 9 is supplied as an external power supply, first, a power supply adapter 10 is connected. By the connection of the power adapter 10, the AC power supply 9 is connected to the electronic musical instrument main circuit 1 instead of the battery power supply 8 being disconnected from the electronic musical instrument main circuit 1. When the momentary power switch 21 is turned on in this state, the power supply on / off control circuit 15 starts continuous supply of power from the AC power supply 9 to the electronic musical instrument main circuit 1 in substantially the same operation as in the case of the battery power supply 8. As a result, the electronic musical instrument becomes operable, and the microcomputer 2 starts the main routine of FIG. At the same time, the second detection circuit 24 detects the connection of the AC power supply 9 and supplies a detection signal having a logic level “1” to the input port of the microcomputer 2. In this way, the state of the input port is maintained at "1" as long as the connection of the AC power supply 9 is continued. Thereafter, the microcomputer 2 performs the last waiting time WT by performing substantially the same operation as in the case of the battery power supply 8.
Is set in the word-off timer register OFT, the occurrence of the no-operation event state is detected by executing step 39.
By executing the process 2, even if the no-operation event state continues for the set waiting time WT or more, the interruption of the power supply from the AC power supply 9 is prohibited.

The present invention is not limited to the one in which the automatic power-off is always prohibited when the AC power supply 9 is connected as in the above-described embodiment, but is selectively disabled when the AC power supply 9 is connected. Power off may be prohibited. In order to selectively inhibit the automatic power-off as described above, for example, the following configuration example can be adopted. One is a detection enable switch 26 as shown by the dashed block in FIG.
And the switch 26 turns the detection function of the second detection circuit 24 on and off. Another example is that an auto power off flag that stores “1” when auto power off is to be executed by software and “0” when prohibition is performed by software is prepared, and the timer processing of FIG. Performs processing based on the stored contents of the flag. That is, instead of determining whether the input port is "1" in step 42 of FIG. 8, it is determined whether the input port is "1" and the value of the auto power off flag is "0". Only when the determination result is NO, the subsequent steps 43 and 44 are executed.

The present invention is not limited to the setting of the waiting time in accordance with the operation event on the keyboard or the operation panel as described above, but the setting of the waiting time in accordance with information indicating other performance events. You may do so. For example, an event of generating a tone signal by automatic accompaniment,
Alternatively, the waiting time may be set in accordance with information indicating an input event or the like of performance information input from the MIDI terminal.

[0029]

As described above, according to the present invention, it is detected whether or not the external power supply is supplied to the electronic musical instrument. If the external power supply is not supplied, that is, if the internal power supply is If the power is supplied, the power is cut off to save power when the performance event information is not generated for a predetermined time or more. by this,
While it is possible to prevent the consumption of the internal power supply, if an external power supply is used as the drive power supply for the electronic musical instrument, it is possible to prevent inappropriate automatic power-off from being performed.
It has an excellent effect. Since the control circuit operates with the power supply controlled in this way, there is no inconvenience that the internal power supply is used in the control circuit in parallel with the use of the external power supply. The saving effect can be further enhanced. Further, according to the present invention, the processing for controlling the operation of the electronic musical instrument is performed by a control circuit for executing a program in accordance with a program, that is, a computer circuit such as a microcomputer. In addition to performing the original processing of the electronic musical instrument, that is, the event information detection processing for detecting the presence / absence, and the processing for performing a predetermined performance control when the performance event information is generated, the performance event information is not generated. A process is performed to determine whether or not the event has continued for a predetermined time or more.If no performance event information has been generated for a predetermined time or more and no external power supply detection signal has been output from the external power supply detection means, For example, the program may be configured to perform a process of generating a power-off instruction to the power supply unit. Therefore, without adding a special control circuit for the power cutoff control process, the power supply is shared by a control circuit for performing various performance operation control processes based on the generation of performance event information. It is possible to perform an interruption control process, and it is possible to perform the power interruption control process with an extremely simple circuit configuration. Furthermore, according to the present invention, a control circuit is included.
A power on / off that controls the power supply to each part of the electronic musical instrument
Power supply circuit based on manual operation of the power switch.
Supply control (manual control), and power-off command from the control circuit.
It is controlled by both control based on decree (automatic control)
Configuration, one power on / off control circuit is manually controlled.
Control and automatic control, and this power supply
The on / off control circuit is implemented between the internal power supply and the external power supply.
It is used qualitatively, and the power on / off control
That the circuit configuration can be simplified.
It has the effect .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an entire electronic musical instrument using a power supply device according to an embodiment of the present invention.

FIG. 2 is an exemplary view showing an example of an interrupt routine executed by the microcomputer of FIG. 1;

FIG. 3 is an exemplary view showing an example of a main routine executed by the microcomputer of FIG. 1;

FIG. 4 is an exemplary view showing an example of a key-on event process executed in a keyboard process in the main routine of FIG. 3;

FIG. 5 is an exemplary view showing an example of a key-off event process executed in a keyboard process in the main routine of FIG. 3;

FIG. 6 is a view showing an example of a panel operator ON event process executed in the panel process in the main routine of FIG. 3;

FIG. 7 is a diagram showing an example of a timer interrupt process executed by the microcomputer.

FIG. 8 is a view showing an example of a timer process in the main routine of FIG. 3;

[Explanation of symbols]

2 microcomputer, 3 keyboard, 6 operation panel, 8 battery power, 9 AC power, 10 power adapter, 15 power on / off control circuit, 24 detection circuit.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-60-116020 (JP, A) JP-A-63-188695 (JP, U) JP-A-59-161191 (JP, U) JP-A-60-161191 79344 (JP, U) Japanese Utility Model Showa 51-152828 (JP, U) JP-B 55-13217 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) G10H 1/00

Claims (2)

(57) [Claims] 1. An internal power supply provided inside an electronic musical instrument, external power supply means for introducing an external power supply, and one of the internal power supply or the external power supply introduced by the external power supply means is selectively selected. and power supply means for supplying to the external power supply detecting means for outputting an external power supply detection signal in response thereto when the external power is supplied by said power supply means, processing for controlling the operation of the electronic musical instrument a control circuit for executing according to a program, and event information detecting process for detecting the presence or absence of occurrence of the performance event information, a process of executing a predetermined performance operations control when generating chromatic performance event information, the performance event information A process of determining whether or not a state in which no performance has occurred has continued for a predetermined time or more; If the external power supply detection signal from the power supply detection means is not outputted, and made to configure the program to perform a process for generating a power cutoff instruction, a power-on in response to operation of the operator Power switch to control
And power supplied selectively by the power supply means.
The power supply for supplying to the control circuit and each part of the electronic musical instrument;
Control is performed in accordance with the operation of the switch, and the control circuit and the electronic musical instrument are controlled in response to a power-off command from the control circuit .
Power on to control to cut off power supply to each part
A power supply device for an electronic musical instrument comprising an off control circuit. 2. The power supply device for an electronic musical instrument according to claim 1, further comprising selection means for selecting whether or not to execute the power supply cutoff command generation processing.