KR102078245B1 - Bluetooth speaker for Public Address - Google Patents

Abstract

The Bluetooth speaker may be installed on a ceiling to receive public address broadcasts, communicate with a user's wireless terminal to listen to music, and receive a communication line and a power wireless AP unit for wireless network communication; And a matching transformer that receives an all-optical broadcasting signal, transforms it into a set voltage, and delivers it, a microphone that converts the input voice into an electrical signal, a Bluetooth module for short-range communication with a user's wireless terminal, and a Bluetooth sound source with high output. A Bluetooth unit having an audio amplifier for amplifying, a relay for selectively outputting PA or Bluetooth sound source, and a speaker for outputting PA or Bluetooth sound source via the relay; When the power is supplied to the Bluetooth unit, the PA signal is recorded and output to the speaker. When the power supply of the Bluetooth unit is cut off, the PA signal is output only to the speaker. Recording from the installed wireless terminal Receives the voice and outputs it to the speaker, or transfer the received voice to another wireless terminal to share, the speaker is blocked so that the sound is not transmitted to the inside of the ceiling, the sound can be output only to the outside of the speaker The sound output from the may further include a noise blocking means for blocking the noise from being transmitted to the other generation through the ceiling and the wall inside.

Description

Bluetooth speaker for public address {Bluetooth speaker for Public Address}

The present invention relates to a Bluetooth speaker for public address broadcasting, and more specifically, even if power is not supplied due to a power failure or a device error, the public address signal may be received and output to a speaker, even without expensive acoustic equipment. The present invention relates to a Bluetooth speaker for public address broadcasting, which can be paired with a wireless terminal and can enjoy high quality music through amplification of high power, and can prevent noise between floors.

Recently, with the development of digital technology and mobile communication technology, portable devices that can be carried and used by individuals such as mobile phones, laptops and MP3 players are gradually increasing. The portable devices such as mobile phones, laptops, and MP3 players can store music files and are configured to play stored music files. Accordingly, users of portable devices are able to listen to music while carrying the portable devices, and the desire to listen to music files stored in the portable devices through high-powered speakers in homes or companies is increasing. Accordingly, there is an increasing demand for a speaker for easily receiving and outputting music stored in a portable device.

Users who carry these portable devices can switch usage status by operating and adjusting each device individually. In recent years, Bluetooth wireless technology is applied to allow remote devices to interoperate without cables by short-range wireless communication. This inconvenience is solved.

On the other hand, in general, apartments and apartments, such as apartments and officetels, in which a large number of households live together, are provided with a speaker system for each household, and a broadcasting system for broadcasting public address such as announcements is provided through a management office or a guard room. .

The public address broadcasting system transmits the main information such as singularity, power outage, and facility construction directly to the residents in the household in real time, thereby incurring damages and disadvantages to the residents who do not know the notices attached to the building bulletin board or elevator bulletin board. It can be prevented from occurring, and it is effectively used to inform residents of various information related to the apartment. Recently, in the all-optical broadcasting system, the speaker installed in each generation is applied as a Bluetooth speaker equipped with a Bluetooth function so that it can be used as a general Bluetooth speaker in general, and can be used as a public speaker for public address broadcasting. .

However, the conventional public speaker Bluetooth speaker as described above has a problem that the public speaker broadcast cannot be received when the public speaker speaker is not supplied due to power failure or malfunction of the device.

In addition, the conventional Bluetooth speaker for public address broadcasting does not have a separate layer noise prevention measure, so that noise can be transmitted to the neighboring generations through the floor slab or the wall of each generation through the speaker during public address broadcasting. Can be generated.

Republic of Korea Utility Model Registration 20-0480349

An object of the present invention is to solve such a problem, even when the power supply is not made due to power failure or device error, it is possible to receive the PA signal and output it directly to the speaker. The present invention provides a public speaker Bluetooth speaker that can prevent high-quality sound, and can be paired with a wireless terminal to enjoy high quality music through amplification of high power, and can check the operation state of the Bluetooth speaker even without expensive audio equipment.

In the Bluetooth speaker for public address broadcasting according to an embodiment of the present invention for achieving the above object, the public speaker is installed on the ceiling to receive public address broadcasting and communicate with a user's wireless terminal to listen to music. A wireless AP unit configured to receive a communication line and power and perform wireless network communication; And a matching transformer that receives an all-optical broadcasting signal, transforms it into a set voltage, and delivers it, a microphone that converts the input voice into an electrical signal, a Bluetooth module for short-range communication with a user's wireless terminal, and a Bluetooth sound source with high output. A Bluetooth unit having an audio amplifier for amplifying, a relay for selectively outputting PA or Bluetooth sound source, and a speaker for outputting PA or Bluetooth sound source via the relay; When the power is supplied to the Bluetooth unit, the PA signal is recorded and output to the speaker. When the power supply of the Bluetooth unit is cut off, the PA signal is output only to the speaker. Recording from the installed wireless terminal Receives the voice and outputs it to the speaker, or transfer the received voice to another wireless terminal to share, the speaker is blocked so that the sound is not transmitted to the inside of the ceiling, the sound can be output only outside the ceiling The sound output from the may further include a noise blocking means for blocking the noise from being transmitted to the other generation through the ceiling and the wall inside.

In addition, the wireless AP unit, the power supply and the communication line may be connected via the RJ45 connector in a PoE (Power over Ethernet) method from the generation terminal box.

In addition, the Bluetooth unit is provided with an audio detector for detecting a voice signal input to the Bluetooth unit, and when a sound is detected through the audio detector, it can automatically recognize it and output it to a recording and a speaker.

In addition, when a voice signal is input to the Bluetooth unit and a silent sound is detected for 10 seconds or more after the start of recording, the recording may be stopped.

The Bluetooth unit may receive new public data and transmit new recording data received to a paired wireless terminal when the newly recorded data is generated, store the recording data transmitted from the wireless terminal, and store the stored recording data in the wireless terminal. Can be played on

In addition, when the wireless terminal is paired with the Bluetooth speaker, data is synchronized by a user's selection through an installed application, and the data stored in the wireless terminal may be automatically deleted from old data when it is larger than a preset capacity range.

In addition, only one wireless terminal that can be paired with the Bluetooth speaker at the same time is limited to one, and may be paired with another wireless terminal only when the Bluetooth terminal and the paired wireless terminal are unpaired.

In addition, when the all-broadcast voice signal is detected while the Bluetooth speaker and the wireless terminal are paired and listening to the music of the wireless terminal through the Bluetooth speaker, the music of the wireless terminal is paused and the all-optical voice is given priority. If the silent state lasts for more than 10 seconds, the music of the paused wireless terminal can be played again.

In addition, the noise blocking means, the blocking case is installed to surround the entire rear of the speaker so that only one direction in which the sound of the speaker is output; And a sound absorbing material attached to an inner circumferential surface of the case accommodating the speaker and absorbing sound.

The public speaker Bluetooth speaker according to the present invention has the following effects.

First, even if the power is not supplied due to power failure or device error, it can receive the PA signal and output it directly to the speaker so that it can receive the PA notification at all times. There is an effect that can listen to real-time information to the residents in the household.

Second, the sound can be output only to the outside of the ceiling through noise blocking means installed inside the Bluetooth speaker. When listening to music or public address broadcasting through the Bluetooth speaker, the sound output from the speaker can be output through the ceiling and the wall. By preventing noise from being transmitted to other generations, it is possible to provide countermeasures for noise between floors. Third, it is possible to enjoy high quality music through amplification of high power by pairing with a wireless terminal without expensive audio equipment. It is effective to check the operation status of the speaker.

1 is a schematic diagram showing an overall public address system installed with a Bluetooth speaker for public address broadcast according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing the configuration of the Bluetooth speaker for public address according to an embodiment of the present invention.
Figure 3 is a schematic diagram showing only the configuration that is driven when the power failure in the Bluetooth speaker for public address according to an embodiment of the present invention.
Figure 4 is a schematic diagram showing only the configuration that is driven when operating as a Bluetooth speaker in the public speaker Bluetooth speaker according to an embodiment of the present invention.
5 is a view schematically showing a state in which noise blocking means of the public speaker Bluetooth speaker according to an embodiment of the present invention is installed.
6 is a front view of a public speaker Bluetooth speaker according to an embodiment of the present invention.
7 is a view showing an example of using a smartphone screen using an app via a smart phone Bluetooth speaker for public address according to an embodiment of the present invention.

DETAILED DESCRIPTION In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings that illustrate preferred embodiments of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a block diagram schematically showing an entire public address broadcasting system in which a public speaker Bluetooth speaker is installed according to an embodiment of the present invention, and FIG. 2 schematically shows a configuration of a public speaker Bluetooth speaker according to an embodiment of the present invention. It is a block diagram.

Referring to Figure 1, the public speaker Bluetooth speaker 10 (hereinafter referred to as a Bluetooth speaker) according to an embodiment of the present invention is installed and managed on the ceiling in the household of a multi-family apartment such as apartments or officetel living together The present invention relates to a Bluetooth speaker that listens to public address broadcasts transmitted from an office (2), is connected to a personal wireless terminal such as a smartphone, and is used as a Bluetooth speaker, and provides a wireless AP function.

The Bluetooth speaker 10 is connected to the first line (3), which is a telecommunications line, from the generation terminal box (1) provided in each household for power and network connection, and the management office (2) to receive public address signals. Is connected to the second line (4). That is, the Bluetooth speaker 10 may have a communication line input from the outside to a multiplexer (not shown) of the generation terminal box 1, connected through the multiplexer, and main power may be supplied from the first line 3. .

Referring to Figure 2, public speaker Bluetooth speaker 10 according to an embodiment of the present invention is largely supplied with a communication line and power to the wireless AP unit 100 for wireless network communication, the wireless terminal and Bluetooth communication Bluetooth unit 200 for outputting the PA and Bluetooth sound source.

The wireless AP unit 100 includes a PoE board 110 for receiving power and an AP board 120 in charge of wireless communication. The PoE board 110 is a portion to which the first line 3 connected to the generation terminal box 1 described above is connected, and the power and communication lines are connected from the generation terminal box via an RJ45 connector in a PoE (Power over Ethernet) method. do. At this time, the PoE board 110 is provided with a connecting portion 111 for connecting the first line 3, the connecting portion 111 may be applied to the RJ-45 standard that is a standard connector for connecting the electrical device and the network. .

In addition, the PoE board 110 power is supplied from the generation terminal box 1 through the connection unit 111 in the form of DC48V, and the voltage may be converted and used in the PoE board 110.

In addition, the AP board 120 is a device for connecting wireless devices to a wired device using a related standard using Wi-Fi in a computer network, and is a part for implementing a wireless network.

Next, the Bluetooth unit 200 receives the PA voice signal transmitted from the management office 2 and outputs it to the speaker, and communicates with the personal wireless terminal to reconstruct the music, the Bluetooth unit 200 May include a matching transformer 210, an audio input unit 220, a microphone 230, an MCU 240, a Bluetooth module 250, an audio amplifier 260, a relay 270, and a speaker 280. .

The matching transformer 210 receives a high output sound source, that is, an all-optical broadcast signal sent from the management office 2, and converts the converted voltage or output to a preset voltage or output to operate in a general speaker.

The audio input unit 220 receives a public address signal, which is a voice signal output through the matching transformer 210, and the audio input unit 22 includes an audio detector 221 for detecting an input voice signal. . The audio detector 221 is a part that automatically recognizes the sound input through the audio input unit 220 and outputs the recorded sound and the speaker. In this case, when a voice signal is input and a silent time is detected for a predetermined time after the start of recording, for example, 10 seconds or more, the recording may be programmed to stop recording.

The microphone 230 is a part for converting the voice signal and the external voice signal input through the audio input unit 22 into an electrical signal. When a sound source is detected, sound may be recorded through the microphone 230, and may be output to the speaker 280 at the same time.

MCU (Micro Controller Unit) 240 is a dedicated processor for controlling the system, and is a non-memory semiconductor that plays a role of controlling the system as a core chip serving as a brain. That is, it is a main part that determines and controls how to output the input voice signal. The MCU 240 may include a power input unit 241, an LED controller 242, and a status display unit 243.

The power input unit 241 may be connected to the PoE board 110 of the wireless AP unit 100 to receive power to manage the power of the Bluetooth unit 200. In addition, the LED controller 242 is a part for controlling the pairing and recording with the wireless terminal. In addition, the status display unit 243 may be provided on the outside of the Bluetooth speaker 10 to display an overall operating state of the Bluetooth speaker 10, and may include a switch for resetting or controlling power.

Bluetooth module 250 is a part for short-range communication with a user's wireless terminal, Bluetooth 4.0 or higher version can be applied, and is connected to the MCU 240 and controlled, Bluetooth module 250 for recording voice The memory unit 251, which is a storage space, and an antenna 252 for communication may be provided.

The audio amplifier 260 amplifies the Bluetooth sound source transmitted from the wireless terminal with high output. The audio amplifier 260 may receive a sound source output through the Bluetooth module 250 and output the amplified sound source of high power through the control of the MCU 240.

The relay 270 is a part for selectively outputting the Bluetooth sound source of the PA or wireless terminal, the speaker 280 to control to selectively output the PA or Bluetooth sound source via the relay 270 Part.

The relay 270 records the PA signal and outputs it to the speaker 280 when the power is supplied to the Bluetooth unit 200. If the power supply of the Bluetooth unit 200 is cut off, the public address broadcast is performed. Only the signal 280 can be output to the speaker. That is, the relay 270 is connected to the first contact 271 when the power supply is cut off so that the PA signal is directly output to the speaker 280, and when the power is supplied, the PA signal is recorded or simultaneously. It is connected to the second contact 272 to be output to the speaker 280.

In addition, the Bluetooth speaker 10 may receive the recorded voice from the wireless terminal, the application is installed, output to the speaker 280, or transfer the received voice to another wireless terminal to share.

Figure 3 is a schematic diagram showing only the configuration that is driven when the power failure in the public speaker Bluetooth speaker according to an embodiment of the present invention, Figure 4 is a Bluetooth speaker in the public speaker Bluetooth speaker according to an embodiment of the present invention It is a schematic diagram schematically showing only the components driven when operating.

Referring to FIG. 3, when public address broadcasting is performed in a power failure state in which power is not supplied to the Bluetooth speaker 10, the public address broadcasting voice signal is transmitted from the management office 2 through the second line 4. In the case of input through the matching transformer 210 and the audio input unit 220 through the matching transformer 210, the relay 270 operates in the state of the first contact 271, and the PA voice can be directly output to the speaker 280. have. In this case, a separate power source for operating the Bluetooth unit 200 is not supplied, but the second line 4 may include a signal and a power line capable of outputting the PA voice signal to the speaker 280.

Referring to FIG. 4, when the Bluetooth speaker 10 receives a sound source from a wireless terminal and attempts to play the Bluetooth sound source, the power source and the connection unit 111 of the wireless AP 100 are connected through the first line 3. In the state in which the communication line is connected, the sound source transmitted from the wireless terminal through the Bluetooth module 250 is received and stored in the memory unit 251 and sent to the audio amplifier 260 at the same time, the audio signal output from the audio amplifier 260 Is output to the speaker 280 via the relay 270, where the relay 270 may be operated in a state of the second contact 272.

The Bluetooth speaker 10 automatically activates the Bluetooth unit 200 when the main power is input, and outputs a signal sound indicating an ON operation, and whenever the signal sound is output, the relay 270 is in the state of the second contact 272. When the process of outputting a signal through the second contact 272 is stopped, the state is automatically switched to the state of the first contact 271. That is, the relay 270 may be programmed to operate in the state of the first contact 271 while the power is supplied and operate in the state of the second contact 272 while the power is not supplied.

In addition, the Bluetooth speaker 10 may be provided with a separate power ON / OFF button for the presence and failure of the check. In this case, when the power button is pressed in the ON state or pressed in the OFF state, a beep may be output to recognize a corresponding operation.

On the other hand, the Bluetooth speaker 10 blocks the sound from being transmitted to the inside of the ceiling, and allows the sound to be output only to the outside of the ceiling, so that the sound output from the speaker 280 is transmitted to another generation through the ceiling and the wall. It may further include a noise blocking means 283 to block the noise to prevent.

5 is a view schematically showing a state in which noise blocking means of a public speaker Bluetooth speaker according to an embodiment of the present invention, Figure 6 is a cross-sectional view of the public speaker Bluetooth speaker according to an embodiment of the present invention.

Referring to FIG. 5, the Bluetooth speaker 10 may basically include an installation unit 281 for installing on a ceiling, and a case 282 housing the wireless AP 100 and the Bluetooth unit 200. have.

The case 282 is installed so that the sound of the speaker 280 toward the installation unit 281 direction, the wireless AP 100 and the Bluetooth unit 200 therein, the noise blocking The means 283 may be provided with a blocking case 284 to surround the entire rear of the speaker 280 so that only one direction in which the sound of the speaker 280 is output is opened.

The blocking case 284 is a part for controlling the directivity of the sound so that the sound output from the speaker 280 is output in only one direction, except that the front part from which the sound is output from the speaker 280 is closed. It may be installed to surround the speaker 280.

The sound absorbing material 285 is a portion for absorbing the sound generated inside the speaker 280, and is attached to an inner circumferential surface of the case 282 accommodating the speaker 280, and absorbs sound and vibration output from the speaker 280. The sound absorbing material 285 may be made of a material such as paper, nonwoven fabric or rubber.

Meanwhile, referring to FIG. 6, the Bluetooth speaker 10 may expand the wireless communication possible range by adopting 2.4G and 5G dual antennas, and operating states through an external power button, a reset button, and a status display unit 243. It can be configured to check the LED lighting.

FIG. 7 is a diagram illustrating an example of using a smartphone screen using an app through a smartphone, which is a kind of a wireless terminal H, for a public speaker Bluetooth speaker according to an embodiment of the present invention.

Referring to FIG. 7, the Bluetooth speaker 10 may control a mutual communication related function through an application of a wireless terminal H (mobile device such as a smartphone capable of wireless communication).

That is, the Bluetooth unit 200 of the Bluetooth speaker 10 receives the PA and transmits the new recording data received to the paired wireless terminal H when the newly recorded data is generated, and the wireless terminal H It saves the transmitted recording data and can play the stored recording data in the wireless terminal.

In addition, when the wireless terminal is paired with the Bluetooth speaker 10, data is synchronized by a user's selection through an installed application, and data stored in the wireless terminal may be set to be automatically deleted from old data when the wireless terminal is above a preset capacity range. Can be.

In this case, the wireless terminal capable of pairing with the Bluetooth speaker 10 at the same time is limited to one, and may be set to be capable of pairing with another wireless terminal only in a state in which the wireless terminal paired with the Bluetooth speaker 10 is released. .

In addition, when the all-broadcast voice signal is detected while the Bluetooth speaker 10 and the wireless terminal are paired and listening to the music of the wireless terminal through the Bluetooth speaker 10, the music of the wireless terminal being paused is paused and all-optical The broadcast voice is output to the speaker first, and if the silent state lasts more than 10 seconds, the music of the paused wireless terminal can be played again.

As such, the public address may be listened to through the application installed in the wireless terminal H, the recorded voice may be transmitted to the Bluetooth speaker 10, and voice data may be synchronized by the user's selection.

Bluetooth speaker 10 according to an embodiment of the present invention according to the technical idea of the present invention, even if the power supply is not made due to power failure or device error can receive the PA signal and directly output to the speaker 280. There is an effect that can receive real-time public address notification by the singular, power outages, facility construction and other important information to listen to real-time information to residents in the household, and noise blocking means installed inside the Bluetooth speaker 10 (( 283) allows the sound to be output outside the ceiling, so that when the user listens to music or public address broadcast through the Bluetooth speaker 10, the sound output from the speaker 280 may be generated in another generation through the ceiling and the wall. By blocking the noise so that it is not transmitted to the floor is the effect that can be prepared to counter the noise.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the meaning or the scope of the present invention described in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

10: Bluetooth speaker 100: Wireless AP
110: PoE board 111: connection
120: AP board 200: Bluetooth unit
210: matching transformer 220: audio input unit
221: audio detector 230: microphone
240: MCU 241: power input unit
242: LED control unit 243: status display unit
250: Bluetooth module 251: Memory unit
252: antenna 260: audio amplifier
270: relay 271: first contact
272: second contact 280: speaker
281: mounting portion 282: case
283: noise blocking means 284: blocking case
285: sound absorbing material

Claims (9)

In the Bluetooth speaker 10 is installed on the ceiling to receive public address, and communicate with the user's wireless terminal to listen to music,
The Bluetooth speaker 10 is supplied with a communication line and power to perform a wireless network communication with the wireless AP unit 100 and the wireless terminal (H) Bluetooth communication and public address and the Bluetooth sound source of the wireless terminal (H) Including a Bluetooth unit 200 for outputting,
The Bluetooth unit 200 may include a matching transformer 210 for receiving an all-optical broadcasting signal, transforming the voltage into a predetermined voltage, and transmitting the matching signal; and an audio input unit 220 for receiving a voice signal output through the matching transformer 210; A microphone 230 for converting the input voice into an electrical signal, a Bluetooth module 250 for short-range communication with the user's wireless terminal H, an audio amplifier 260 for amplifying the Bluetooth sound source with high power, , A relay 270 for selectively outputting PA or Bluetooth sound source, a speaker 280 for outputting PA or Bluetooth sound source via the relay, the matching transformer 210, an audio input unit 220, a microphone 230, a MCU 240 for controlling the Bluetooth module 250, the audio amplifier 260, the relay 270, and the speakers 280,
The audio input unit 220 is provided with an audio detector 221, and the audio detector 221 automatically recognizes a sound input through the audio input unit 220 and outputs the sound to the recording and speaker 280. The audio detector 221 stops recording when a voice signal is input to the Bluetooth unit 200 and a silent sound is detected for a predetermined time after the start of recording.
The microcontroller unit (240) is a dedicated processor for controlling, and the microcontroller (240) includes a power input unit 241, an LED controller 242, and a status display unit 243, and the power input unit ( 241 is connected to the PoE board 110 of the wireless AP unit 100 is supplied with power to manage the power of the Bluetooth unit 200, the LED controller 242 is paired with the wireless terminal (H) and To control the recording, the status display unit 243 is provided outside the Bluetooth speaker 10 to display the overall operating state of the Bluetooth speaker 10,
When the power supply is supplied to the Bluetooth unit 200, the relay 270 detects the PA message input to the Bluetooth unit 200, and the audio detector 221 detects the audio detector 221. When the PA signal is detected through the automatic recognition and output to the recording and the speaker, and if the power supply of the Bluetooth unit is cut off, so that the PA signal is output only to the speaker 280,
The Bluetooth speaker 10 may receive the recorded voice from the wireless terminal (H) in which the application is installed and output it to the speaker 280, or transfer the received voice to another wireless terminal (H), and share it.
If the all-broadcast voice signal is detected while the Bluetooth speaker 10 and the wireless terminal H are paired to listen to the music of the wireless terminal H through the Bluetooth speaker, the music of the wireless terminal being paused is paused. All-optical broadcasting voice is output to the speaker first, and if the silent state lasts for a certain time, the music of the wireless terminal paused is played again.
The speaker 280 may be provided with an installation unit 281 for installing on the ceiling, and a sound of the wireless AP 100, the Bluetooth unit 200, and the speaker 280 toward the installation unit 281. It is installed so as to, the blocking case 284 surrounding the entire rear of the speaker 280 so that only one direction in which the sound of the speaker 280 is output, and the sound absorbing material 285 for absorbing sound generated inside the speaker 280 Sound blocking means (283) consisting of a case formed with a case 282 is formed so that the sound is not transmitted to the inside of the ceiling, and the sound output from the speaker so that the sound can be output only to the outside of the ceiling inside and the wall Bluetooth speaker for public address, characterized in that to block the noise from being transmitted to other generations through. delete delete delete The method of claim 1,
The Bluetooth unit 200,
When receiving the PA and newly recorded data is generated, the new recording data transmitted to the paired wireless terminal H is transmitted, the recording data transmitted from the wireless terminal H is stored, and the stored recording data is stored in the wireless terminal. Bluetooth speaker for public address, characterized in that can be played in (H). delete The method of claim 1,
The wireless terminal H that can be paired with the Bluetooth speaker 10 at the same time is limited to one,
The Bluetooth speaker for public address broadcasting, characterized in that pairing with another wireless terminal is possible only in a state in which the wireless terminal (H) paired with the Bluetooth speaker is released. delete delete

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