JP2023085758A - Sound transmission system, sound transmission device, and power supply method - Google Patents

Abstract

To provide a sound transmission system, a sound transmission device and a power supply method with which it is possible to control electric power supply in accordance with whether or not first and second sound transmission devices are properly connected, and to improve safety.SOLUTION: A first sound transmission device 2 comprises: a power source unit 4 for supplying electric power; a first signal line 5 for transmitting electric power from the first sound transmission device to a second sound transmission device 3; a second signal line 6 for transmitting sound input and output signals between the first and second sound transmission devices; a comparator 7 for acquiring a voltage V_Det from the second signal line and comparing it with a reference voltage V_Ref; and an electric power control unit 8 for controlling whether or not to transmit electric power, on the basis of a comparison result.SELECTED DRAWING: Figure 5

Description

The present invention relates to a sound transmission system, a sound transmission device, and a power supply method for transmitting power from a first sound transmission device to a second sound transmission device.

2. Description of the Related Art A device capable of supplying power and inputting/outputting sound signals to a connected external device is known in the prior art. Patent Document 1 discloses an electronic device that has a common I/F for headphones for analog signals and optical digital signals, and that can supply power to the optical digital headphones.

JP 2010-154173 A

However, in the prior art as described above, even if the external device is not properly connected due to factors such as disconnection of the signal line that transmits the input signal or the output signal of the sound, the terminal connected to the external device is inserted into the device. Since the electric power is supplied in response to the fact that the electric power is detected, although it is weak, there is a possibility that the user may receive an electric shock.

One aspect of the present invention has been made in view of the above problem, and controls power supply according to whether or not the first sound transmission device and the second sound transmission device are properly connected. , intended to improve safety.

In order to solve the above problems, a sound transmission system according to one aspect of the present invention includes a first sound transmission device and a second sound transmission device,
The first sound transmission device comprises: a power supply section for supplying power; a first signal line for transmitting the power from the first sound transmission device to the second sound transmission device; A second signal line for transmitting at least one of an input signal and an output signal of sound between the sound transmission device and the second sound transmission device, and voltage is obtained from the second signal line. and a power control unit configured to control whether or not to transmit the power from the first sound transmission device to the second sound transmission device based on the voltage. .

In order to solve the above-described problems, a sound transmission device according to an aspect of the present invention is a sound transmission device, comprising: a power supply section for supplying electric power; and external sound from the sound transmission device. A first signal line that transmits the power to the transmission device, and a second signal line that transmits at least one of an input signal and an output signal of sound between the sound transmission device and the external sound transmission device. an acquisition unit that acquires the voltage from the second signal line; and a power control unit that controls whether or not to transmit the power from the sound transmission device to the external sound transmission device based on the voltage. and

In order to solve the above problems, a power supply method according to an aspect of the present invention provides a power supply method between a first signal line that transmits power to a second sound transmission device and the second sound transmission device. 2. A method of supplying power from a first sound transmission device having a second signal line for transmitting at least one of an input signal and an output signal of sound to the second sound transmission device an acquiring step of acquiring a voltage from the second signal line; and based on the voltage, the electric power from the first sound transmission device to the second sound transmission device through the first signal line. and a power control step for controlling whether to transmit the
It is characterized by

According to one aspect of the present invention, power supply can be controlled depending on whether or not the first sound transmission device and the second sound transmission device are properly connected, and safety can be improved.

1 is a schematic diagram of a sound transmission system according to an embodiment; FIG. FIG. 2 is a perspective view showing the appearance of a first sound transmission device provided in the sound transmission system; 3A and 3B are a front view and a side view showing appearances of a first sound transmission device and a second sound transmission device provided in the sound transmission system; FIG. It is a circuit diagram of the said 1st sound transmission apparatus and a 2nd sound transmission apparatus. FIG. 2 is a circuit diagram of a main part of the first sound transmission device; FIG. 11 is a circuit diagram of a main part of a modified example of the first sound transmission device; FIG. 4 is a schematic diagram of mini-plugs connected to jacks provided in the first and second sound transmission devices; FIG. 4 is a schematic block diagram illustrating the relationship between a first signal line and a second signal line provided in the first sound transmission device and the mini-plug;

[Embodiment 1]
An embodiment of the present invention will be described in detail below.

FIG. 1 is a schematic diagram of a sound transmission system 1 according to an embodiment. FIG. 2 is a perspective view showing the appearance of the first sound transmission device 2 provided in the sound transmission system 1. As shown in FIG. 3A and 3B are a front view and a side view showing the appearance of the first sound transmission device 2 and the second sound transmission device 3 provided in the sound transmission system 1. FIG.

A sound transmission system 1 includes a first sound transmission device 2 and a second sound transmission device 3 . The first sound transmission device 2 has a first sound input section 12 and a first sound output section 13 . The second sound transmission device 3 has a second sound input section 16 and a second sound output section 17 .

The first sound input section 12 and the second sound input section 16 are, for example, microphones. The first sound output section 13 and the second sound output section 17 are speakers, for example.

A partition plate 44 is provided between the first sound transmission device 2 and the second sound transmission device 3 . The first sound transmission device 2 and the second sound transmission device 3 are connected by a connection cable 20 .

The first sound input unit 12 inputs a voice P from the user 18 . The second sound output section 17 outputs the voice P from the user 18 input to the first sound input section 12 . The second sound output unit 17 inputs voice Q from the user 19 . The first sound output section 13 outputs the voice Q from the user 19 input to the second sound input section 16 .

Power for the first sound input section 12 and the first sound output section 13 is supplied to the first sound transmission device 2 through the cable 21 . This power is also supplied to the second sound input section 16 and the second sound output section 17 of the second sound transmission device 3 through the connection cable 20 from the first sound transmission device 2 .

FIG. 4 is a circuit diagram of the first sound transmission device 2 and the second sound transmission device 3. As shown in FIG.

The first sound transmission device 2 includes a power supply unit 4 that supplies power, a first signal line 5 that transmits the power from the first sound transmission device 2 to the second sound transmission device 3, and a first between the sound transmission device 2 and the second sound transmission device 3, a second signal line 6 for transmitting an input signal and an output signal of sound, and an acquisition for acquiring a voltage from the second signal line 6 and a power control unit 8 for controlling whether or not to transmit the power from the first sound transmission device 2 to the second sound transmission device 3 based on the voltage.

The sound input signal is, for example, a sound signal corresponding to the sound input to the first sound input unit 12 . The sound output signal is, for example, a sound signal corresponding to the sound output from the first sound output unit 13 .

Acquisition unit 7 may be, for example, a comparator. The power control unit 8 can be, for example, a microcomputer. A DC voltage of 12 V, for example, is supplied to the power supply unit 4 through a cable 21 .

The first sound transmission device 2 further includes a high side switch 22 connected to the power supply section 4 . One end of the first signal line 5 is connected to the high side switch 22 .

The first sound transmission device 2 has a jack 23 (first connection section) connected to the connection cable 20 . The second sound transmission device 3 has a jack 24 (second connection section) connected to the connection cable 20 . The other end of first signal line 5 is connected to jack 23 .

The second signal line 6 includes a sound input signal line 25 connected to the first sound input section 12 and a sound output signal line 26 connected to the first sound output section 13 via a line amplifier.

The second sound transmission device 3 transmits a third signal line 14 provided for receiving the power via the first signal line 5, and an input signal and an output signal of the sound. A fourth signal line 15 is provided for the purpose. The fourth signal line 15 includes a sound input signal line 27 connected to the second sound input section 16 and a sound output signal line 28 connected to the second sound output section 17 via a line amplifier. The third signal line 14 , sound input signal line 27 and sound output signal line 28 are connected to the jack 24 .

Thus, the sound transmission system 1 further includes the connection cable 20 that connects the first sound transmission device 2 and the second sound transmission device 3 . The first sound transmission device 2 has a jack 23 to which the connection cable 20 is connected. The first signal line 5 and the second signal line 6 are connected to jacks 23 . The second sound transmission device 3 has a jack 24 to which the connection cable 20 is connected. The third signal line 14 and the fourth signal line 15 are connected to jacks 24 .

For example, the sound input signal line 25 and the sound output signal line 26 are connected to the jack 23 , and the sound input signal line 27 and the sound output signal line 28 are connected to the jack 24 .

When the first sound transmission device 2 and the second sound transmission device 3 are connected via the second signal line 6 and the fourth signal line 15, the first sound transmission device 2 of the first sound transmission device 2 The sound output unit 13 outputs the sound input to the second sound input unit 16 of the second sound transmission device 3, and the second sound output unit 17 of the second sound transmission device 3 outputs the first The sound input to the first sound input unit 12 of the sound transmission device 2 is output.

For example, a sound input to the second sound input section 16 is converted into an audio signal, passes through the sound input signal line 27, the jack 24, the connection cable 20, the jack 23, and the sound output signal line 26, and passes through the first sound output section. 13 , converted into sound by the first sound output unit 13 , and output from the first sound output unit 13 . The sound input to the first sound input section 12 is converted into an audio signal, passes through the sound input signal line 25, the jack 23, the connection cable 20, the jack 24, and the sound output signal line 28, and passes through the second sound output section 17. , converted into sound by the second sound output unit 17 , and output from the second sound output unit 17 .

FIG. 5 is a main circuit diagram of the first sound transmission device 2. As shown in FIG. Components similar to those described above are labeled with similar reference numerals and their detailed description will not be repeated.

The voltages that the acquisition unit 7 acquires from the second signal line 6 are the detection voltage V_Det that fluctuates when the first sound transmission device 2 and the second sound transmission device 3 are connected, and the detection voltage V_Det and a reference voltage V_Ref that is used as a reference for comparison. When the value of the detection voltage V_Det is lower than the value of the reference voltage V_Ref, the power control unit 8 performs control so that the power is transmitted from the first sound transmission device 2 to the second sound transmission device 3 .

For example, the acquisition unit 7 acquires the detection voltage V_Det and the reference voltage V_Ref from the sound output signal line 26 . When the value of the detection voltage V_Det is lower than the value of the reference voltage V_Ref, the acquisition unit 7 transmits a predetermined connection detection signal to the power control unit 8 . Upon receiving the connection detection signal from the acquisition unit 7 , the power control unit 8 transmits a signal for turning on the high side switch 22 to the high side switch 22 . When the high-side switch 22 is turned on, power is transmitted from the power supply unit 4 to the second sound transmission device 3 through the high-side switch 22 .

The sound output signal line 26 of the second signal line 6 connects the first sound transmission device 2 and the second sound transmission device 3 via the sound output signal line 26 of the second signal line 6 . an electronic component 9 that causes a voltage drop when a current flows through the sound output signal line 26; a downstream wiring 11 connected downstream of the electronic component 9 in the . The reference voltage V_Ref is input to the acquisition unit 7 from the upstream wiring 10 , and the detection voltage V_Det is input to the acquisition unit 7 from the downstream wiring 11 .

For example, the acquisition unit 7 is connected to the upstream wiring 10 and the downstream wiring 11 and receives the reference voltage V_Ref input from the upstream wiring 10 connected to the upstream side of the electronic component 9 and the It is compared with the detection voltage V_Det input from the connected downstream wiring 11 .

Electronic component 9 can be, for example, a capacitor.

The power control unit 8 stops supplying power to the first signal line 5 when detecting power equal to or greater than a predetermined value while the power supply unit 4 is supplying the power to the first signal line 5 . do.

For example, when the power control unit 8 receives an overcurrent detection signal from the high-side switch 22 after transmitting a signal for turning on the high-side switch 22 to the high-side switch 22, the power control unit 8 turns off the high-side switch 22. to the high-side switch 22.

The acquisition unit 7 receives the detection voltage V_Det and the reference voltage V_Ref as inputs, and outputs the result of comparing them to the power control unit 8 . The detection voltage V_Det is a voltage based on the analog audio signal flowing through the sound output signal line 26 .

The voltage of the analog audio signal when the first sound transmission device 2 is not connected to the second sound transmission device 3 is a voltage with a difference of, for example, less than ±1% from the reference voltage V_Ref. substantially equal to the reference voltage V_Ref.

When the second sound transmission device 3 is connected, a voltage drop occurs due to the circuit load of the second sound transmission device 3 .

For example, when the detection voltage V_Det is divided, the detection voltage V_Det is 2.5 V when the first sound transmission device 2 is connected to the second sound transmission device 3 with respect to the reference voltage V_Ref=5 V. When the detection voltage V_Det is this low, it is determined that the first sound transmission device 2 is connected to the second sound transmission device 3 .

Even if the detection voltage V_Det is not about 2.5V, if it is lower than the reference voltage V_Ref by, for example, 1% or more, it means that the first sound transmission device 2 is connected to the second sound transmission device 3. You can judge.

In order to use the analog audio signal as a voltage for detection, direct current (DC) is superimposed on the analog audio signal, and the analog audio signal is superimposed on the reference voltage V_Ref. is the reference voltage V_Ref, and it is possible to accurately confirm the connection with the other device.

When the value of the detection voltage V_Det is lower than the value of the reference voltage V_Ref, the acquisition unit 7 transmits a high-level connection detection signal representing connection to the power control unit 8 . When the value of the detection voltage V_Det is not lower than the value of the reference voltage V_Ref, the acquisition unit 7 transmits a low-level connection detection signal indicating disconnection to the power control unit 8 .

The high-side switch 22 is turned off in the initial state. The power control unit 8 transmits a low-level control signal for turning off the high-side switch 22 to the high-side switch 22 when receiving the connection detection signal representing the disconnection from the acquiring unit 7 . Therefore, the high-side switch 22 is turned off, and power is not transmitted from the first sound transmission device 2 to the second sound transmission device 3 through the first signal line 5 .

When receiving a connection detection signal indicating connection from the acquisition unit 7 , the power control unit 8 transmits a high-level control signal to the high-side switch 22 to turn on the high-side switch 22 . Therefore, the high-side switch 22 is turned on, and power is transmitted from the first sound transmission device 2 to the second sound transmission device 3 through the first signal line 5 .

The high-side switch 22 transmits a high-level overcurrent detection signal representing normality to the power control unit 8 when power less than a predetermined value is supplied from the power supply unit 4 . When the high-side switch 22 detects that the power supply unit 4 is supplying power equal to or greater than a predetermined value, the high-side switch 22 transmits a low-level overcurrent detection signal indicating an abnormality to the power control unit 8 . When the power control unit 8 receives an overcurrent detection signal representing an abnormality from the high side switch 22 , the power control unit 8 transmits to the high side switch 22 a control signal for turning off the high side switch 22 . Therefore, the high-side switch 22 is turned off, and even if the first sound transmission device 2 is connected to the second sound transmission device 3, the signal from the first sound transmission device 2 to the second sound transmission device 3 is No power is transmitted through the first signal line 5 .

Although an example in which the second signal line 6 includes the sound input signal line 25 and the sound output signal line 26 is given, the present invention is not limited to this. The second signal line 6 may transmit at least one of an input signal and an output signal of sound.

FIG. 6 is a main circuit diagram of a first sound transmission device 2A according to a modification. Components similar to those described above are labeled with similar reference numerals and their detailed description will not be repeated.

In the embodiment described above, an example in which the acquisition unit 7 acquires voltage from the sound output signal line 26 has been described. However, the invention is not limited to this. The obtaining unit 7 may obtain the voltage from the sound input signal line 25 .

When the first sound transmission device 2 and the second sound transmission device 3 are connected via the sound input signal line 25, the sound input signal line 25 of the second signal line 6 of the sound transmission device 2A is An electronic component 29 that causes a voltage drop, an upstream wiring 10 connected upstream of the electronic component 29 when a current flows on the sound input signal line 25, and an electronic component 10 when a current flows on the sound input signal line 25. and a downstream wiring 11 connected downstream of the component 29 .

The reference voltage V_Ref is input from the upstream wiring 10 to the acquiring unit 7 , and the detection voltage V_Det is input from the downstream wiring 11 to the acquiring unit 7 .

FIG. 7 is a schematic diagram of a mini-plug 30 connected to the jack 23 provided on the first sound transmission device 2 and the jack 24 provided on the second sound transmission device 3. As shown in FIG. FIG. 8 is a schematic block diagram illustrating the relationship between the first signal line 5 and the second signal line 6 provided in the first sound transmission device 2 and the mini-plug 30. As shown in FIG. Components similar to those described above are labeled with similar reference numerals and their detailed description will not be repeated.

The mini plugs 30 are 4-pole plugs and are provided at both ends of the connection cable 20 . A mini-plug 30 at one end of the connection cable 20 is connected to the jack 23 and a mini-plug 30 at the other end is connected to the jack 24 . The mini plug 30 includes a grip portion 31 gripped by a user for attaching and detaching from the jack 23 or 24, cylindrical ring portions 32, 33, and 34, a tip portion 35 provided at the tip, and a ring portion. 32 , 33 , 34 and an insulating portion 36 for insulating the tip portion 35 . The ring portion 32 corresponds to a ground line 37 through which a signal of ground potential flows. The ring part 33 is connected to the first signal line 5 or the third signal line 14 for transmitting power from the first sound transmission device 2 to the second sound transmission device 3 . The ring portion 34 is connected to the sound input signal line 25 or 27 . The tip portion 35 is connected to the sound output signal line 26 or 28 .

A ground potential signal corresponding to the ring portion 32 is transmitted to the acquisition portion 7 through the ground line 37 . Power is transmitted from the power supply unit 4 through the high-side switch 22 and the first signal line 5 corresponding to the ring unit 33 . The acquisition unit 7 acquires the detection voltage V_Det and the reference voltage V_Ref from the sound output signal line 26 corresponding to the chip unit 35 . The acquisition unit 7 may acquire the detection voltage V_Det and the reference voltage V_Ref from the sound output signal line 25 corresponding to the ring unit 34 . When the value of the detection voltage V_Det is lower than the value of the reference voltage V_Ref, the acquisition unit 7 transmits a predetermined connection detection signal to the power control unit 8 . Upon receiving the connection detection signal from the acquisition unit 7 , the power control unit 8 transmits a signal for turning on the high side switch 22 to the high side switch 22 .

The configuration of four poles (microphone, left audio, right audio, ground (GND)) is the configuration of a general earphone mini plug, but in this embodiment, a speaker set for conversation, the audio is monaural. used and the remaining one pole is used for power supply.

Although an example of a 4-pole plug has been shown, the present invention is not limited to this. The mini-plug 30 is not limited to a 4-pole plug, and may be a 3-pole plug (left audio, right audio, GND).

In the case of this 3-pole plug, for example, in the case of the configuration shown in FIG. 5 described above, the configuration in which the audio input signal line 25 of the Audio in is deleted is the circuit diagram when using the 3-pole plug, which is shown in FIG. 6 described above. As for the configuration, the configuration in which the audio output signal line 26 for Audio out is deleted is the circuit diagram when using the 3-pole plug.

There is also a 5-pole plug (left audio, right audio, GND + 2 poles are added to connect a microphone for silenced speakers such as noise canceling), but this embodiment can also be implemented using this 5-pole plug. Either one of the two additional poles can be used for power supply while listening to the voice. As described above, the present embodiment can be implemented with a mini plug having three or more poles.

In the power supply method according to the present embodiment, between the first signal line 5 for transmitting power to the second sound transmission device 3 and the second sound transmission device 3, a sound input signal and an output signal A method of supplying power from a first sound transmission device 2 having a second signal line 6 for transmitting at least one of an acquisition step of acquiring a voltage from the line 6; and based on the voltage, determining whether or not to transmit the power from the first sound transmission device 2 to the second sound transmission device 3 through the first signal line 5. and a power control step to control.

As described above, according to this embodiment, when the voltage of the analog audio signal drops, power is supplied to the other party's device. This voltage drop in the analog audio signal occurs only when the base unit and the destination unit are securely connected by a mini-plug. Therefore, since power is not supplied when the device is not connected to the other device due to disconnection or the like, there is no risk of electric shock.

Then, the first signal line 5 and the second signal line 6 connected to the connection cable 20 for inputting and outputting sound are used to transmit power and to determine whether or not to transmit power. There is no need to provide a dedicated cable related to power transmission separately from the connection cable 20 for sound input/output, and the number of parts in the circuit configuration can be reduced.

Further, since power is supplied from the first sound transmission device 2 to the second sound transmission device 3, the second sound transmission device 3 uses a cable for supplying power provided in the first sound transmission device 2. Since the power supply cable such as 21 becomes unnecessary, the number of parts in the circuit configuration of the second sound transmission device 3 is reduced. Moreover, the second sound transmission device 3 does not need to be equipped with a battery, and the number of parts in the circuit configuration can be reduced.

〔summary〕
A sound transmission system 1 according to aspect 1 of the present invention is a sound transmission system 1 including a first sound transmission device 2/2A and a second sound transmission device 3, wherein the first sound transmission device 2/ 2A includes a power supply unit 4 for supplying power, a first signal line 5 for transmitting power from the first sound transmission device 2 2A to the second sound transmission device 3, and the first Between the sound transmission device 2/2A and the second sound transmission device 3, a second signal line 6 for transmitting at least one of an input signal and an output signal of sound, and the second signal. an acquisition unit 7 that acquires a voltage from a line 6; and power control that controls whether or not to transmit the power from the first sound transmission device 2/2A to the second sound transmission device 3 based on the voltage. a part 8;

According to the above configuration, power is supplied to the second sound transmission device via the first signal line only when the connection via the second signal line is established. Accordingly, power supply can be controlled depending on whether the first sound transmission device and the second sound transmission device are properly connected, and safety can be improved.

In the sound transmission system 1 according to aspect 2 of the present invention, in the above aspect 1, the voltage varies when the first sound transmission device 2/2A and the second sound transmission device 3 are connected. It includes a detection voltage V_Det and a reference voltage V_Ref that serves as a reference for comparison of the detection voltage V_Det. Preferably, the power is transmitted from the first sound transmission device 2/2A to the second sound transmission device 3.

According to the above configuration, when the value of the voltage for detection becomes lower than the reference voltage, the acquisition unit causes the first sound transmission device and the second sound transmission device to be connected to the second signal line. You can get that you are connected via

In the sound transmission system 1 according to aspect 3 of the present invention, in the above aspect 2, the second signal line 6 is configured such that the first sound transmission device 2/2A and the second sound transmission device 3 are connected to the Electronic components 9 and 29 that cause a voltage drop when connected via the second signal line 6, and upstream of the electronic components 9 and 29 when current flows on the second signal line 6 and a downstream wiring 11 connected downstream of the electronic components 9 and 29 when a current flows on the second signal line 6. The reference voltage V_Ref is It is preferable that the detection voltage V_Det is input to the acquisition unit 7 from the upstream wiring 10 , and the detection voltage V_Det is input to the acquisition unit 7 from the downstream wiring 11 .

According to the above configuration, when the first sound transmission device and the second sound transmission device are connected via the second signal line, the voltage drop caused by the electronic component is reduced to the upstream side of the electronic component. can be detected by the reference voltage input to the acquisition unit from the upstream wiring connected to the electronic component, and the detection voltage input to the acquisition unit from the downstream wiring connected to the downstream side of the electronic component.

A sound transmission system 1 according to aspect 4 of the present invention, in any one aspect of aspects 1 to 3, includes a connection cable 20 that connects the first sound transmission device 2 and the second sound transmission device 3. Further, the first sound transmission device 2 has a first connection portion (jack 23) to which the connection cable 20 is connected, and the first signal line 5 and the second signal line 6 are , is preferably connected to the first connection portion (jack 23).

According to the above configuration, the connection cable connects the first sound transmission device and the second sound transmission device, which are arranged at separate positions, to transmit power from the first sound transmission device to the second sound transmission device. can be transmitted. Then, the first signal line and the second signal line connected to the connection cable for inputting and outputting sound are used to transmit power and to determine whether or not to transmit power. There is no need to provide a related dedicated cable separate from the connection cable for inputting and outputting sound, and the number of parts in the circuit configuration is reduced.

In the sound transmission system 1 according to aspect 5 of the present invention, in any one aspect of aspects 1 to 4, the second sound transmission device 3 receives the power via the first signal line 5. A third signal line 14 and a fourth signal line 15 for transmitting at least one of the input signal and the output signal of the sound are provided, and the first sound transmission device 2/2A is connected to the second sound transmission device 2/2A. The second sound transmission device 3 has a second sound input unit 16 connected to the fourth signal line 15. and a second sound output unit 17, and the first sound transmission device 2/2A and the second sound transmission device 3 are connected via the second signal line 6 and the fourth signal line 15 When connected, the first sound output section 13 of the first sound transmission device 2/2A outputs the sound input to the second sound input section 16 of the second sound transmission device 3, and Preferably, the second sound output section 17 of the second sound transmission device 3 outputs the sound input to the first sound input section 12 of the first sound transmission device 2/2A.

According to the above configuration, the sound transmission system can realize, for example, a mode of making a call.

A sound transmission system 1 according to aspect 6 of the present invention, in aspect 5 above, further includes a connection cable 20 that connects the first sound transmission device 2 and the second sound transmission device 3, The sound transmission device 3 includes a second connection portion (jack 24) to which the connection cable 20 is connected, and the third signal line 14 and the fourth signal line 15 are connected to the second connection portion (jack 24).

According to the above configuration, the connection cable connects the first sound transmission device and the second sound transmission device, which are arranged at separate positions, to transmit power from the first sound transmission device to the second sound transmission device. can be transmitted. Since power is supplied from the first sound transmission device to the second sound transmission device, the second sound transmission device does not require a power supply cable for supplying power provided to the first sound transmission device. Therefore, the number of parts in the circuit configuration of the second sound transmission device is reduced. Also, the second sound transmission device does not need to be equipped with a battery, and the number of parts in the circuit configuration is reduced.

In the sound transmission system 1 according to aspect 7 of the present invention, in any one aspect of aspects 1 to 6, the power control unit 8 causes the power supply unit 4 to supply the power to the first signal line 5. It is preferable to stop the supply of power to the first signal line 5 when power exceeding a predetermined value is detected.

According to the above configuration, for example, when an overcurrent occurs due to disconnection of the first signal line or a signal line connected to the first signal line, the power supply unit stops supplying power to ensure safety. can improve sexuality.

A sound transmission device (first sound transmission device 2/2A) according to aspect 8 of the present invention is a sound transmission device (first sound transmission device 2/2A), comprising: a power supply unit 4 for supplying electric power; A first signal line 5 for transmitting the power from the sound transmission device (first sound transmission device 2/2A) to the external sound transmission device (second sound transmission device 3); A second signal for transmitting at least one of a sound input signal and an output signal between the first sound transmission device 2, 2A) and the external sound transmission device (second sound transmission device 3). line 6, an acquisition unit 7 for acquiring voltage from the second signal line 6, and based on the voltage, the sound transmission device (first sound transmission device 2/2A) to the external sound transmission device (second and a power control unit 8 for controlling whether or not to transmit the power to the sound transmission device 3) of (1).

In the power supply method according to aspect 9 of the present invention, between the first signal line 5 for transmitting power to the second sound transmission device 3 and the second sound transmission device 3, a sound input signal and an output signal, and a second signal line 6 for transmitting at least one of a an acquisition step of acquiring a voltage from the second signal line 6, and the first signal from the first sound transmission device 2/2A to the second sound transmission device 3 based on the voltage and a power control step for controlling whether the transmission of said power over line 5 takes place.

The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

1 sound transmission system 2 first sound transmission device (sound transmission device)
3 Second sound transmission device (external sound transmission device)
4 power supply section 5 first signal line 6 second signal line 7 acquisition section 8 power control section 9 electronic component 10 upstream wiring 11 downstream wiring 12 first sound input section 13 first sound output section 14 third signal line 15 fourth signal line 16 second sound input section 17 second sound output section 20 connection cable 23 jack (first connection section)
24 jack (second connection)
29 Electronic component 30 Mini plug V_Det Voltage for detection V_Ref Reference voltage

Claims (9)

A sound transmission system comprising a first sound transmission device and a second sound transmission device,
The first sound transmission device,
a power supply unit that supplies electric power;
a first signal line for transmitting the power from the first sound transmission device to the second sound transmission device;
a second signal line for transmitting at least one of a sound input signal and a sound output signal between the first sound transmission device and the second sound transmission device;
an acquisition unit that acquires voltage from the second signal line;
and a power control unit that controls whether or not to transmit the power from the first sound transmission device to the second sound transmission device based on the voltage. The voltage is
a detection voltage that fluctuates when the first sound transmission device and the second sound transmission device are connected; and a reference voltage that serves as a reference for comparison of the detection voltage,
The power control unit
3. The apparatus according to claim 1, wherein when the value of said detection voltage is lower than the value of said reference voltage, control is performed so that said power is transmitted from said first sound transmission device to said second sound transmission device. 2. The sound transmission system according to 1. The second signal line is
an electronic component that causes a voltage drop when the first sound transmission device and the second sound transmission device are connected via the second signal line;
an upstream wiring connected upstream of the electronic component when a current flows on the second signal line;
a downstream wiring connected downstream of the electronic component when a current flows on the second signal line;
The reference voltage is input to the acquisition unit from the upstream wiring, and the detection voltage is input to the acquisition unit from the downstream wiring.
3. The sound transmission system according to claim 2, characterized by: further comprising a connection cable that connects the first sound transmission device and the second sound transmission device;
The first sound transmission device,
A first connection portion to which the connection cable is connected,
The first signal line and the second signal line are connected to the first connection section,
The sound transmission system according to any one of claims 1 to 3, characterized in that: The second sound transmission device is
a third signal line for receiving the power via the first signal line, and a fourth signal line for transmitting at least one of the input signal and the output signal of the sound,
The first sound transmission device includes a first sound input unit and a first sound output unit connected to the second signal line,
The second sound transmission device includes a second sound input unit and a second sound output unit connected to the fourth signal line,
When the first sound transmission device and the second sound transmission device are connected via the second signal line and the fourth signal line, the first sound transmission device of the first sound transmission device The sound output unit outputs sound input to the second sound input unit of the second sound transmission device, and the second sound output unit of the second sound transmission device performs the first sound transmission outputting the sound input to the first sound input unit of the device;
The sound transmission system according to any one of claims 1 to 4, characterized in that: further comprising a connection cable that connects the first sound transmission device and the second sound transmission device;
The second sound transmission device is
A second connection portion to which the connection cable is connected,
the third signal line and the fourth signal line are connected to the second connection portion;
6. The sound transmission system according to claim 5, characterized in that: The power control unit
The power supply unit stops supplying power to the first signal line when detecting power equal to or greater than a predetermined value while supplying the power to the first signal line. Sound transmission system according to any one of claims 1 to 6. A sound transmission device,
a power supply unit that supplies electric power;
a first signal line for transmitting the power from the sound transmission device to an external sound transmission device;
a second signal line for transmitting at least one of a sound input signal and a sound output signal between the sound transmission device and the external sound transmission device;
an acquisition unit that acquires voltage from the second signal line;
and a power control unit that controls whether or not to transmit the power from the sound transmission device to the external sound transmission device based on the voltage. A second signal line that transmits at least one of an input signal and an output signal of sound between a first signal line that transmits power to the second sound transmission device and the second sound transmission device. A method of supplying power to the second sound transmission device from a first sound transmission device comprising a signal line of
an acquiring step of acquiring a voltage from the second signal line;
and a power control step of controlling, based on the voltage, whether or not to transmit the power from the first sound transmission device to the second sound transmission device through the first signal line. A power supply method characterized by:

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