Acoustic device and control method

Abstract

This acoustic device comprises: a first power supply system that supplies power from a first battery to a first amplifier of a first channel to which a first speaker is connected; a second power supply system that supplies power from a second battery to a second amplifier of a second channel to which a second speaker is connected; a control unit that receives an input of a signal of a sound source, generates a signal of the first channel and a signal of the second channel, and outputs the generated signals to the first amplifier and the second amplifier, respectively; and a power supply circuit that supplies power to the control unit from the battery having a higher output voltage among the first battery and the second battery.

Description

Audio device and control method

[0001] The present disclosure relates to an audio device and a control method.

[0002] Patent Document 1 describes detecting the remaining amount of each of a plurality of batteries in an electric vehicle having a plurality of batteries provided corresponding to each of a plurality of drive wheels and supplying power to drive the corresponding drive wheels. Further, Patent Document 1 describes reducing the driving force of the drive wheel corresponding to the battery with a small remaining amount selected based on the remaining amount of each battery and the determination condition, and increasing the driving force of the drive wheel installed on the same side as the drive wheel with the reduced driving force in the vehicle width direction, and performing drive control of each drive wheel.

[0003] Japanese Patent Application Laid-Open No. 2022-144834

[0004] However, in the above prior art, when there is a bias in the remaining amount in a plurality of batteries, the driving force is controlled so that the consumption of the battery with a large remaining amount increases, and the balance of the remaining amount of each battery is adjusted. Therefore, the control of the remaining amount of the battery becomes complicated.

[0005] Therefore, the present disclosure proposes an audio device and a control method capable of equalizing the remaining amounts of a plurality of batteries without complicated control.

[0006] An audio device according to an aspect of the present disclosure includes a first power supply system that supplies power from a first battery to a first amplifier of a first channel to which a first speaker is connected, a second power supply system that supplies power from a second battery to a second amplifier of a second channel to which a second speaker is connected, a control unit that receives an input of a signal from a sound source, generates a signal for the first channel and a signal for the second channel, and outputs the signals to the first amplifier and the second amplifier respectively, and a power supply circuit that supplies power from the battery on the side with a higher output voltage between the first battery and the second battery to the control unit.

[0007] This figure shows an example of the appearance of an acoustic device according to an embodiment of this disclosure. This block diagram shows an example of the functional configuration of an acoustic device according to an embodiment of this disclosure. This flowchart shows an example of battery state management processing according to an embodiment of this disclosure. This is a hardware configuration diagram showing an example of a computer that implements the functions of the control unit of the acoustic device.

[0008] Embodiments of this disclosure will be described in detail below with reference to the drawings. In each of the following embodiments, the same parts will be denoted by the same reference numerals to avoid redundant descriptions.

[0009] This disclosure will be described in the following order of items: 1. Configuration of the sound device according to the embodiment 2. Operation of the power supply system according to the embodiment 3. Procedure for information processing according to the embodiment 4. Modifications of the embodiment 5. Hardware configuration

[0010] (Embodiment) <<1. Configuration of the sound device according to the embodiment>> Figure 1 is a diagram showing an example of the appearance of a sound device according to the embodiment of the present disclosure. As shown in Figure 1, the sound device 1 has a speaker unit 15, an operation unit 60, and an illumination unit 61. The sound device 1 is a device that outputs a signal from an external sound source as a high-output sound signal (hereinafter also referred to as a voice signal or audio signal) from the speaker unit 15. The sound device 1 has a built-in battery, as will be described later, and can be used even in places where it cannot be connected to an external power source.

[0011] The control unit 60 receives input for operation of the sound device 1. The control unit 60 receives operations such as selecting an external sound source, adjusting the volume, setting the illumination, and turning the power on / off. The illumination unit 61 flashes its lights according to the settings, for example.

[0012] Figure 2 is a block diagram showing an example of the functional configuration of an acoustic device according to the present disclosure. As shown in Figure 2, the functional unit 10 of the acoustic device 1 includes a power supply circuit 11, a speaker unit 15, a first power supply system 20, an L-channel amplifier 25, a second power supply system 30, an R-channel amplifier 35, a power supply circuit 40, and a control unit 50. The speaker unit 15 also includes an L-channel speaker 12, an R-channel speaker 13, and a subwoofer 14.

[0013] The first power supply system 20 includes a battery 21, a charge / discharge circuit 22, a boost circuit 23, and a switching circuit 24. The second power supply system 30 also includes a battery 31, a charge / discharge circuit 32, a boost circuit 33, and a switching circuit 34.

[0014] Batteries 21 and 31 are, for example, lithium-ion secondary batteries. Batteries 21 and 31 are, for example, batteries of the same capacity with a rated power of 100 Wh or less each. In addition to lithium-ion secondary batteries, batteries 21 and 31 may be other types of secondary batteries such as nickel-metal hydride batteries. Batteries 21 and 31 are connected to the control unit 50 by a serial bus, for example, SMBus (System Management Bus), so that the battery status can be monitored.

[0015] The charge / discharge circuits 22 and 32 are circuits that control the charging and discharging of batteries 21 and 31. The charge / discharge circuits 22 and 32 are designed to control the charging current of batteries 21 and 31, for example, I ２ The control unit 50 is connected via a serial bus such as the C (Inter-Integrated Circuit) Bus. When batteries 21 and 31 are discharged, power is supplied from batteries 21 and 31 to the boost circuits 23 and 33, respectively, via the charge / discharge circuits 22 and 32.

[0016] The boost circuits 23 and 33 boost the output voltages of the batteries 21 and 31 to the power supply voltage PVDD of the L-channel amplifier 25 and R-channel amplifier 35. For example, if the PVDD of the L-channel amplifier 25 and R-channel amplifier 35 is 24.5V, the boost circuits 23 and 33 boost the output voltage of the batteries 21 and 31 from an example of 7.4V to 24.5V.

[0017] The switching circuits 24 and 34 switch the power supplied to the L-channel amplifier 25 and R-channel amplifier 35 between an external power source and batteries 21 and 31. For example, when an external power source is connected, the switching circuits 24 and 34 switch to supply power from the power supply circuit 11 to the L-channel amplifier 25 and R-channel amplifier 35. Also, for example, when an external power source is not connected, the switching circuits 24 and 34 switch to supply power from batteries 21 and 31 to the L-channel amplifier 25 and R-channel amplifier 35, respectively.

[0018] The L-channel amplifier 25 is, for example, a Class D amplifier, and the amplifier's power supply voltage, PVDD, is supplied from the first power supply system 20. When an external power supply is connected to the L-channel amplifier 25, PVDD is supplied from the power supply circuit 11 via diode 26. Diode 26 is a diode for preventing reverse current from the switching circuit 24 to the power supply circuit 11. The L-channel amplifier 25 amplifies the L-channel audio signal TW-L input from the DAC (Digital to Analog Converter) 53 (described later) and outputs it to the L-channel speaker 12. The L-channel amplifier 25 also amplifies the subwoofer signal SW input from the DAC 54 (described later) and outputs it to the subwoofer 14. Alternatively, the L-channel amplifier 25 may amplify the subwoofer signal SW input from the DAC 53 and output it to the subwoofer 14. Furthermore, the connection between the L-channel amplifier 25, the L-channel speaker 12, and the subwoofer 14 is, for example, a BTL (Balanced Transformer Less) connection.

[0019] The R-channel amplifier 35 is, for example, a Class D amplifier, and the amplifier's power supply voltage, PVDD, is supplied from the second power supply system 30. When an external power supply is connected to the R-channel amplifier 35, PVDD is supplied from the power supply circuit 11 via diode 36. Diode 36 is a diode for preventing reverse current from the switching circuit 34 to the power supply circuit 11. The R-channel amplifier 35 amplifies the R-channel audio signal TW-R input from the DAC 54 (described later) and outputs it to the R-channel speaker 13. The R-channel amplifier 35 also amplifies the subwoofer signal SW input from the DAC 53 (described later) and outputs it to the subwoofer 14. Alternatively, the R-channel amplifier 35 may amplify the subwoofer signal SW input from the DAC 54 and output it to the subwoofer 14. The connection between the R-channel amplifier 35, the R-channel speaker 13, and the subwoofer 14 is, for example, a BTL connection.

[0020] The power supply circuit 40 supplies power to the power supply system 55 of the control unit 50 from the battery with the higher output voltage among the batteries 21 and 31. The power supply circuit 40 includes, for example, a diode 27 with its anode connected to battery 21 and a diode 37 with its anode connected to battery 31, and the cathodes of diodes 27 and 37 are connected to output terminal 41. Output terminal 41 is connected to the power supply system 55 of the control unit 50. In the power supply circuit 40, power is supplied to the power supply system 55 of the control unit 50 from the battery with the higher output voltage among the batteries 21 and 31 by diodes 27 and 37.

[0021] The control unit 50 includes a SoC (System on a Chip) 51, a DSP (Digital Signal Processor) 52, and DACs 53 and 54. Power is supplied to each part of the control unit 50 from the control unit's power supply system 55. The control unit's power supply system 55 also supplies power to the operation unit 60 and illumination unit 61 shown in Figure 1.

[0022] SoC51, for example, includes a CPU (Central Processing Unit), semiconductor memory elements such as RAM (Random Access Memory) and flash memory, and SMBus, I ２ It has a communication unit such as CBus or Bluetooth® and an input / output unit. The SoC 51's functions of the control unit 50 are realized when a program stored in an internal storage device such as flash memory is executed using RAM as the working area. The SoC 51 receives a sound source signal input from an external input and outputs it to the DSP 52. The external input may be wired or wireless. In other words, the SoC 51 may use a communication unit such as Bluetooth® as the external input. The SoC 51 also manages the state of batteries 21 and 31, for example via SMBus. The SoC 51 also has, for example, I ２ The charging and discharging circuits 22 and 32 are controlled via the CB Bus. The SoC 51 also receives operation input from, for example, the operation unit 60 and controls the illumination unit 61 so that the lights blink according to the settings.

[0023] For example, if the remaining charge of either battery 21 or 31 reaches 0%, SoC 51 determines that the total battery charge of the device is 0% and shuts down the sound device 1. Also, for example, if the remaining charge of both batteries 21 and 31 reaches 100%, SoC 51 determines that the total battery charge of the device is 100% and controls the charge / discharge circuits 22 and 32 to stop charging. SoC 51 manages the state of batteries 21 and 31, for example, assuming that their respective capacities are the same. Alternatively, to prevent over-discharge and over-charge, the remaining charge of batteries 21 and 31 may be managed within a specific range of 0% to 100%.

[0024] When the DSP 52 receives a sound source signal from the SoC 51, it performs predetermined signal processing on the sound source signal to generate an L channel signal and an R channel signal. The DSP 52 outputs the generated L channel signal to the DAC 53 and the R channel signal to the DAC 54.

[0025] When the DAC 53 receives the L-channel signal from the DSP 52, it performs a Digital to Analog (DA) conversion on the L-channel signal to generate the analog L-channel audio signal TW-L and the subwoofer signal SW. The DAC 53 outputs the generated L-channel audio signal TW-L to the L-channel amplifier 25. The DAC 53 also outputs the generated subwoofer signal SW to the R-channel amplifier 35. Alternatively, the DAC 53 may output the generated subwoofer signal SW to the L-channel amplifier 25.

[0026] When the DAC 54 receives the R channel signal from the DSP 52, it performs D / A conversion on the R channel signal to generate analog signals: the R channel audio signal TW-R and the subwoofer signal SW. The DAC 54 outputs the generated R channel audio signal TW-R to the R channel amplifier 35. The DAC 54 also outputs the generated subwoofer signal SW to the L channel amplifier 25. Alternatively, the DAC 54 may output the generated subwoofer signal SW to the R channel amplifier 35.

[0027] The power supply circuit 11, when connected to an external power source such as an AC (Alternating Current) power supply, charges the batteries 21 and 31 and supplies power to the L-channel amplifier 25 and the R-channel amplifier 35. The power supply circuit 11 is connected to the charge / discharge circuits 22 and 32, respectively, and also to the L-channel amplifier 25 and the R-channel amplifier 35 via diodes 26 and 36, respectively. In other words, the power supply circuit 11 is connected to the first power supply system 20 and the second power supply system 30, and supplies power to each of them. The power supply circuit 11 outputs a DC voltage (for example, 24.9V) to the PVDD of the L-channel amplifier 25 and the R-channel amplifier 35, taking into account the voltage drop across diodes 26 and 36. The power supply circuit 11 is capable of outputting approximately 600W of power.

[0028] <<2. Operation of the Power Supply System According to the Embodiment>> As shown in Figure 2, in this embodiment, the power supply system for the L-channel amplifier 25 and the R-channel amplifier 35 is divided into a first power supply system 20 and a second power supply system 30. When the sound device 1 is supplied with power from batteries 21 and 31, the L-channel amplifier 25 is supplied with power from battery 21 by the first power supply system 20, and the R-channel amplifier 35 is supplied with power from battery 31 by the second power supply system 30. In addition, the control unit 50 is supplied with power from the battery with the higher output voltage among batteries 21 and 31 by the power supply circuit 40. Here, the remaining charge of batteries 21 and 31 is proportional to the output voltage. That is, since the sound device 1 supplies power to the control unit 50 from the battery with the greater remaining charge (higher output voltage) among batteries 21 and 31 by the power supply circuit 40, the remaining charge of batteries 21 and 31 can be made uniform (balanced) without complex control. In other words, the sound device 1 can extend its battery life.

[0029] Furthermore, since the audio device 1 has separate power supply systems for the L-channel amplifier 25 and the R-channel amplifier 35, crosstalk can be suppressed. In addition, because the audio device 1 uses multiple batteries, the capacity per battery pack of, for example, lithium-ion secondary batteries can be reduced. As a result, the audio device 1 can avoid being classified as a hazardous material and reduce the impact of transportation restrictions in sea and air transport. Moreover, since the audio device 1 can secure the battery capacity of the entire device, it can achieve high sound pressure when battery-powered.

[0030] In other words, the sound device 1 includes a first power supply system 20, a second power supply system 30, a control unit 50, and a power supply circuit 40. The first power supply system 20 supplies power from a first battery (battery 21) to the first amplifier (L channel amplifier 25) of the first channel (L channel) to which the first speaker (L channel speaker 12) is connected. The second power supply system 30 supplies power from a second battery (battery 31) to the second amplifier (R channel amplifier 35) of the second channel (R channel) to which the second speaker (R channel speaker 13) is connected. The control unit 50 receives the input of a sound source signal, generates the signal for the first channel (L channel signal) and the signal for the second channel (R channel signal), and outputs them to the first amplifier and the second amplifier, respectively. The power supply circuit 40 supplies power to the control unit 50 from the battery with the higher output voltage among the first and second batteries. This allows the sound device 1 to equalize the remaining charge levels of multiple batteries without requiring complex control.

[0031] Furthermore, the sound device 1 further includes a power supply circuit 11 connected to an AC power source. The first battery and the second battery are charged by a first charge / discharge circuit (charge / discharge circuit 22) and a second charge / discharge circuit (charge / discharge circuit 32), respectively, connected to the power supply circuit 11. This allows the sound device 1 to charge multiple batteries individually.

[0032] Furthermore, the first charge / discharge circuit and the second charge / discharge circuit supply power to the first amplifier and the second amplifier, respectively, via the first switching circuit (switching circuit 24) and the second switching circuit (switching circuit 34). This allows the sound device 1 to switch between an external power source and a battery.

[0033] Furthermore, the power supply circuit 11 is connected to the first power supply system 20 and the second power supply system 30. The first and second switching circuits switch the power supply to the first and second amplifiers, respectively, between the first and second batteries and the power supply circuit 11. This allows the sound device 1 to switch between an external power supply and a battery.

[0034] Furthermore, the power supply circuit 40 includes a first diode (diode 27) whose anode is connected to the first battery, and a second diode (diode 37) whose anode is connected to the second battery. The cathodes of the first and second diodes are connected to the output terminal 41. As a result, the sound device 1 can supply power to the control unit 50 via the output terminal 41 from the battery with the greater remaining charge among the multiple batteries.

[0035] Furthermore, the first amplifier and the second amplifier each generate a subwoofer signal based on the signal from the first channel and the signal from the second channel, and output it to the subwoofer 14. This allows the sound device 1 to equally supply power to drive the subwoofer 14 from the first power supply system 20 and the second power supply system 30.

[0036] <<3. Information Processing Procedure According to the Embodiment>> Next, the information processing according to the embodiment will be described using Figure 3. Figure 3 is a flowchart of an example of battery state management processing according to the embodiment of this disclosure. In Figure 3, an example is described in which the control unit 50 manages the state of batteries 21 and 31. In Figure 3, battery 21 is described as the first battery and battery 31 as the second battery.

[0037] The control unit 50 starts managing the status of the first battery and the second battery (step S1). The control unit 50 determines whether or not it is connected to an external power source (step S2). If the control unit 50 determines that it is not connected to an external power source (step S2: No), it determines whether or not the remaining charge of either battery is 0% (step S3). If the control unit 50 determines that the remaining charge of either battery is not 0% (step S3: No), it returns to step S2.

[0038] On the other hand, if the control unit 50 determines that the remaining charge of any one battery is 0% (step S3: Yes), it determines that the remaining charge of the entire device's battery is 0% (step S4) and shuts down the sound device 1 (step S5).

[0039] In step S2, if the control unit 50 determines that it is connected to an external power source (step S2: Yes), it controls the charge / discharge circuits 22 and 32 to start charging the first battery and the second battery (step S6). The control unit 50 determines whether the remaining charge of both the first battery and the second battery is 100% (step S7). If the control unit 50 determines that the remaining charge of both batteries is not 100% (step S7: No), it returns to step S2. If the control unit 50 determines that the remaining charge of both batteries is 100% (step S7: Yes), it determines that the remaining charge of the entire device's battery is 100% (step S8) and controls the charge / discharge circuits 22 and 32 to stop charging. As a result, the sound device 1 can equalize the remaining charge of the first battery and the second battery even if there is an imbalance in the remaining charge that cannot be equalized by the power supply circuit 40.

[0040] In other words, the control unit 50 manages the state of the first battery and the second battery, and controls the first charge / discharge circuit and the second charge / discharge circuit. As a result, the sound device 1 can manage the state of the first battery and the second battery.

[0041] Further, when the remaining amount of either one of the first battery and the second battery becomes 0%, the control unit 50 determines that the remaining amount of the battery as the entire device is 0%. Thereby, the acoustic device 1 can prevent over-discharge of one battery.

[0042] Further, when the remaining amounts of both the first battery and the second battery become 100%, the control unit 50 determines that the remaining amount of the battery as the entire device is 100%. Thereby, even if a bias in the remaining amount of the battery occurs, the acoustic device 1 can equalize the remaining amounts of the first battery and the second battery.

[0043] Further, the control unit 50 manages the states of the first battery and the second battery on the assumption that the capacities of the first battery and the second battery are the same. Thereby, it becomes easier for the acoustic device 1 to perform control that complements the control of the remaining amount of the battery by the power supply circuit 40.

[0044] In other words, the control unit 50 manages the states of the first battery of the first power supply system that supplies power to the first amplifier of the first channel to which the first speaker is connected, and the second battery of the second power supply system that supplies power to the second amplifier of the second channel to which the second speaker is connected. Further, the control unit 50 determines whether or not it is connected to an external power supply. Further, when the control unit 50 determines that it is not connected to an external power supply, and when the remaining amount of either one of the first battery and the second battery becomes 0%, the control unit 50 determines that the remaining amount of the battery as the entire device is 0%. Thereby, the acoustic device 1 can prevent over-discharge of one battery.

[0045] Further, when the control unit 50 determines that it is connected to an external power supply, the control unit 50 starts charging the first battery and the second battery. Further, when the remaining amounts of both the first battery and the second battery become 100%, the control unit 50 determines that the remaining amount of the battery as the entire device is 100%. Thereby, even if a bias in the remaining amount of the battery occurs, the acoustic device 1 can equalize the remaining amounts of the first battery and the second battery.

[0046] <<4. Variations of the Embodiment>> The processing according to the above-described embodiment may be implemented in various different forms other than the above embodiment.

[0047] In the above embodiment, two power supply systems, i.e., the first power supply system 20 and the second power supply system 30, are used as the power supply system, but it is not limited to this. For example, the speakers may be three channels of L channel, C channel, and R channel, and the power supply system may be three systems. In this case, the number of multiple batteries may be three batteries. That is, the number of multiple batteries may be even or odd.

[0048] That is, the audio device 1 includes a plurality of power supply systems, a control unit 50, and a power supply circuit 40. The plurality of power supply systems supply power from each of the plurality of batteries to each of the plurality of amplifiers of the plurality of channels to which the plurality of speakers are respectively connected. The control unit 50 receives the input of the signal of the sound source, generates the signals of each of the plurality of channels, and outputs them to the plurality of amplifiers respectively. The power supply circuit 40 supplies power to the control unit 50 from the battery with the highest output voltage among the plurality of batteries. Thereby, the audio device 1 can equalize the remaining amounts of the plurality of batteries without complicated control.

[0049] Also, in the above embodiment, the audio device 1 is configured to include the batteries 21 and 31 and the power supply circuit 40, but it is not limited to this. For example, the batteries 21 and 31 may be configured to be detachable as a separate body from the audio device 1, or the batteries 21 and 31 and the power supply circuit 40 may be configured to be detachable as a separate body from the audio device 1. That is, among the power supply circuit 40, the diodes 27 and 37 may be provided on the battery 21 and 31 sides respectively, and may be configured to be detachable from the audio device 1 together with the batteries 21 and 31.

[0050] In addition, regarding the processing procedures, specific names, and information including various data and parameters shown in the above documents and drawings, they can be arbitrarily changed unless otherwise specified. For example, the various information shown in each figure is not limited to the illustrated information.

[0051] Furthermore, the components of each illustrated device are functionally conceptual and do not necessarily need to be physically configured as shown. In other words, the specific forms of distribution and integration of each device are not limited to those shown, and all or part of them can be functionally or physically distributed and integrated in any unit according to various loads and usage conditions. For example, in the control unit 50, signal processing in the DSP 52 may be performed by the SoC 51.

[0052] Furthermore, the embodiments and modifications described above can be combined as appropriate, provided that the processing content is not inconsistent.

[0053] <<5. Hardware Configuration>> Embedded information devices such as the control unit 50 according to each embodiment described above may be realized by a computer 1000 having a configuration such as that shown in Figure 4. Hereinafter, the control unit 50, which is an information processing device according to the embodiment, will be described as an example. Figure 4 is a hardware configuration diagram showing an example of a computer that realizes the functions of the control unit of an audio device. The computer 1000 has a CPU 1100, RAM 1200, ROM (Read Only Memory) 1300, HDD (Hard Disk Drive) 1400, communication interface 1500, and input / output interface 1600. The parts of the computer 1000 are connected by a bus 1050.

[0054] The CPU 1100 operates based on programs stored in the ROM 1300 or HDD 1400 and controls each part. For example, the CPU 1100 loads the programs stored in the ROM 1300 or HDD 1400 into the RAM 1200 and executes processing corresponding to various programs.

[0055] ROM 1300 stores boot programs such as the BIOS (Basic Input Output System) that are executed by the CPU 1100 when the computer 1000 starts up, as well as programs that depend on the computer 1000's hardware.

[0056] The HDD 1400 is a computer-readable recording medium that non-temporarily stores programs executed by the CPU 1100 and data used by such programs. Specifically, the HDD 1400 is a recording medium that stores an information processing program according to this disclosure, which is an example of program data 1450.

[0057] The communication interface 1500 is an interface for the computer 1000 to connect to an external network 1550 (e.g., the Internet). For example, the CPU 1100 can receive data from other devices or transmit data it has generated to other devices via the communication interface 1500.

[0058] The input / output interface 1600 is an interface for connecting the input / output device 1650 and the computer 1000. For example, the CPU 1100 receives data from input devices such as a keyboard or mouse via the input / output interface 1600. The CPU 1100 also transmits data to output devices such as a display, speaker, or printer via the input / output interface 1600. The input / output interface 1600 may also function as a media interface for reading programs recorded on a predetermined recording medium (media). Examples of media include optical recording media such as DVDs (Digital Versatile Discs) and PDs (Phase Change Rewritable Disks), magneto-optical recording media such as MOs (Magneto-Optical Disks), tape media, magnetic recording media, or semiconductor memory.

[0059] For example, when the computer 1000 functions as a control unit 50 according to the embodiment, the CPU 1100 of the computer 1000 realizes functions such as the SoC 51 and DSP 52 by executing an information processing program loaded on the RAM 1200. The HDD 1400 stores the information processing program and data such as management data according to this disclosure. The CPU 1100 reads and executes the program data 1450 from the HDD 1400, but as another example, these programs may be obtained from other devices via an external network 1550.

[0060] Furthermore, the effects described herein are merely illustrative and not limiting, and other effects may also occur.

[0061] Furthermore, the present disclosure may also take the following configurations: (1) an audio device comprising: a first power supply system that supplies power from a first battery to a first amplifier of a first channel to which a first speaker is connected; a second power supply system that supplies power from a second battery to a second amplifier of a second channel to which a second speaker is connected; a control unit that receives an input signal from a sound source, generates a signal for the first channel and a signal for the second channel, and outputs them to the first amplifier and the second amplifier, respectively; and a power supply circuit that supplies power to the control unit from the battery with the higher output voltage among the first battery and the second battery. (2) the audio device according to (1), further comprising a power supply circuit connected to an AC power supply, wherein the first battery and the second battery are charged by a first charge / discharge circuit and a second charge / discharge circuit connected to the power supply circuit, respectively. (3) The sound device according to (2), wherein the first charge / discharge circuit and the second charge / discharge circuit supply power to the first amplifier and the second amplifier, respectively, via the first switching circuit and the second switching circuit. (4) The sound device according to (3), wherein the power supply circuit is connected to the first power supply system and the second power supply system, and the first switching circuit and the second switching circuit switch the supply of power to the first amplifier and the second amplifier, respectively, between the first battery and the second battery and the power supply circuit. (5) The sound device according to any one of (1) to (4), wherein the power supply circuit comprises a first diode with its anode connected to the first battery and a second diode with its anode connected to the second battery, and the cathodes of the first diode and the second diode, respectively, are connected to output terminals. (6) The sound apparatus according to any one of (1) to (5), wherein the first amplifier and the second amplifier each generate a subwoofer signal based on the signal of the first channel and the signal of the second channel, and output it to the subwoofer.(7) The sound device according to any one of (2) to (4), wherein the control unit manages the state of the first battery and the second battery and controls the first charge / discharge circuit and the second charge / discharge circuit. (8) The sound device according to (7), wherein the control unit determines that the total battery charge of the device is 0% when the remaining charge of either the first battery or the second battery reaches 0%. (9) The sound device according to (7) or (8), wherein the control unit determines that the total battery charge of the device is 100% when the remaining charge of both the first battery and the second battery reaches 100%. (10) The sound device according to any one of (7) to (9), wherein the control unit manages the state of the first battery and the second battery assuming that their respective capacities are the same. (11) A control method in which a computer performs the following: (11) Managing the state of a first battery in a first power supply system that supplies power to a first amplifier in a first channel to which a first speaker is connected, and a second battery in a second power supply system that supplies power to a second amplifier in a second channel to which a second speaker is connected; determining whether or not the device is connected to an external power supply; and, if it is determined that the device is not connected to an external power supply, determining that the remaining charge of the entire device is 0% when the remaining charge of either the first battery or the second battery reaches 0%. (12) The control method according to (11), in which a computer performs the following: if it is determined that the device is connected to an external power supply, starting to charge the first battery and the second battery; and determining that the remaining charge of the entire device is 100% when the remaining charge of both the first battery and the second battery reaches 100%.

[0062] 1. Audio device 11. Power supply circuit 12. Left channel speaker 13. Right channel speaker 14. Subwoofer 15. Speaker section 20. First power supply system 21, 31. Battery 22, 32. Charge / discharge circuit 23, 33. Boost circuit 24, 34. Switching circuit 25. Left channel amplifier 27, 37. Diode 30. Second power supply system 35. Right channel amplifier 40. Power supply circuit 41. Output terminal 50. Control unit 51. SoC 52. DSP 53, 54. DAC 60. Operation unit 61. Illumination unit

Claims

1. An audio device comprising: a first power supply system that supplies power from a first battery to a first amplifier of a first channel to which a first speaker is connected; a second power supply system that supplies power from a second battery to a second amplifier of a second channel to which a second speaker is connected; a control unit that receives an input signal from a sound source, generates a signal for the first channel and a signal for the second channel, and outputs them to the first amplifier and the second amplifier, respectively; and a power supply circuit that supplies power to the control unit from the battery with the higher output voltage among the first battery and the second battery.

2. The sound device according to claim 1, further comprising a power supply circuit connected to an AC power supply, wherein the first battery and the second battery are charged by a first charge / discharge circuit and a second charge / discharge circuit connected to the power supply circuit, respectively.

3. The sound device according to claim 2, wherein the first charge / discharge circuit and the second charge / discharge circuit supply power to the first amplifier and the second amplifier, respectively, via the first switching circuit and the second switching circuit, respectively.

4. The sound device according to claim 3, wherein the power supply circuit is connected to the first power supply system and the second power supply system, and the first switching circuit and the second switching circuit switch the supply of power to the first amplifier and the second amplifier, respectively, between the first battery and the second battery and the power supply circuit.

5. The sound device according to claim 1, wherein the power supply circuit comprises a first diode whose anode is connected to the first battery and a second diode whose anode is connected to the second battery, and the cathodes of the first diode and the second diode are connected to output terminals.

6. The sound apparatus according to claim 1, wherein the first amplifier and the second amplifier each generate a subwoofer signal based on the signal of the first channel and the signal of the second channel, and output it to the subwoofer.

7. The sound device according to claim 2, wherein the control unit manages the state of the first battery and the second battery and controls the first charge / discharge circuit and the second charge / discharge circuit.

8. The sound device according to claim 7, wherein the control unit determines that the total battery charge of the device is 0% when the remaining charge of either the first battery or the second battery reaches 0%.

9. The sound device according to claim 7, wherein the control unit determines that the total battery charge of the device is 100% when the remaining charge of both the first battery and the second battery reaches 100%.

10. The sound device according to claim 7, wherein the control unit manages the state of the first battery and the second battery, assuming that the capacities of the first battery and the second battery are the same.

11. A control method in which a computer performs the following: managing the state of a first battery in a first power supply system that supplies power to a first amplifier in a first channel to which a first speaker is connected, and a second battery in a second power supply system that supplies power to a second amplifier in a second channel to which a second speaker is connected; determining whether or not the device is connected to an external power supply; and, if it is determined that the device is not connected to an external power supply, determining that the remaining charge of the entire device's battery is 0% if the remaining charge of either the first battery or the second battery reaches 0%.

12. The control method according to claim 11, wherein the computer performs the following actions: when it determines that the device is connected to the external power supply, it starts charging the first battery and the second battery; and when the remaining charge of both the first battery and the second battery reaches 100%, it determines that the remaining battery charge of the entire device is 100%.

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