KR101627213B1 - Individually controllable speaker apparatus, public addressing system and control method using thereof - Google Patents

Individually controllable speaker apparatus, public addressing system and control method using thereof Download PDF

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Publication number
KR101627213B1
KR101627213B1 KR1020160003511A KR20160003511A KR101627213B1 KR 101627213 B1 KR101627213 B1 KR 101627213B1 KR 1020160003511 A KR1020160003511 A KR 1020160003511A KR 20160003511 A KR20160003511 A KR 20160003511A KR 101627213 B1 KR101627213 B1 KR 101627213B1
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South Korea
Prior art keywords
speaker
unit
control
output signal
audio output
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KR1020160003511A
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Korean (ko)
Inventor
최종만
김성훈
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(주)하이텍영상
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/007—Monitoring arrangements; Testing arrangements for public address systems

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Health & Medical Sciences (AREA)
  • Telephonic Communication Services (AREA)

Abstract

A speaker device capable of individually controlling according to the present invention is a speaker device connected to a speaker line branched from a public address broadcast device to transmit sound, A speaker section; A switch unit for connecting or disconnecting the speaker line and the speaker unit; And a control unit for controlling the switch unit according to a control code extracted from the audio output signal or sensing a reference audio output signal transmitted to the speaker unit and transmitting a detection result to the host vehicle broadcasting apparatus .
As a result, according to the present invention, there is provided a method for controlling a whole-body broadcasting system and a speaker device using a speaker device capable of individually controlling a plurality of speaker devices used for a front- It is possible to designate an area to broadcast effectively and to make it easy to maintain.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a speaker device capable of being individually controlled, a public address broadcast system using the same, and a speaker device control method using the same. More particularly, The present invention relates to a speaker system capable of effectively designating an area to be broadcasted and to simplify maintenance, a public address system using the same, and a speaker device control method.

Public address broadcasting system is a multipurpose broadcasting system used for announcement of public facilities such as schools, businesses, buildings, apartments, and music broadcasting. The main function of such a public address system is to provide emergency announcement of the fire by receiving information from the fire receptionist when a fire occurs for the purpose of protection of human life.

1, the conventional public address broadcasting system includes a public address broadcast apparatus 20, a speaker line 40, and a speaker apparatus 10. Although not shown in the drawing, the public address broadcasting apparatus 20 includes a public address broadcast control device for controlling the entire apparatus, an audio matrix for selecting or mixing a plurality of sound sources and outputting them, And a relay group for distributing and outputting the amplified audio signal output from each of the public address broadcasting amplifiers to the selected plurality of speaker lines 40. [

The Public Address System is very useful when notifying a message in a designated area, and can be broadcast at once to the entire building or apartment complex through public address, especially in case of an emergency or an emergency.

However, as shown in FIG. 1, since a plurality of speaker devices 10 are connected to one speaker line 40 branched from a relay group in the conventional all-around public broadcasting system, There is a limit. Especially, in the case of elementary / middle / high school, there is a problem that the broadcasting of the speaker line 40 of the public address system should be considered when assigning the classroom by the grade at the beginning of each grade, since the broadcasting is different according to the grade.

If a disconnection, a short circuit or a short circuit occurs in the speaker line 40 due to the construction or the deterioration of the speaker line 40, a situation may occur in which the entire or a part of the speaker device 10 connected to the speaker line 40 can not hear the broadcast However, when the conventional public address system is installed, there is a problem that the state of a speaker in a building or a whole area in the city must be checked one by one.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a speaker system, The present invention also provides a method of controlling a speaker system, a speaker system, and a speaker system.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

According to another aspect of the present invention, there is provided a loudspeaker apparatus connected to a speaker line branched from a public address broadcasting apparatus for transmitting sound, the apparatus comprising: A speaker unit for sending out the speaker; A switch unit for connecting or disconnecting the speaker line and the speaker unit; And a control unit for controlling the switch unit according to a control code extracted from the audio output signal or for sensing a reference audio output signal transmitted to the speaker unit and transmitting a detection result to the central office broadcasting apparatus, An address unit to which an address designating the speaker unit is assigned; And a control command unit to which an instruction to be performed by the control unit is given. When the address assigned to the address unit coincides with the address of the predetermined speaker apparatus, the control unit executes a command given to the control command unit .

delete

The speaker device according to the present invention is characterized in that the control section comprises: a communication section for receiving the control code from the all-night public broadcasting device or for transmitting a status code of the speaker section to the all-night broadcasting device; A driving unit for driving the switch unit to connect or disconnect the speaker line and the speaker unit; A sensing unit for sensing a state of the reference audio output signal transmitted to the speaker unit and outputting the sensing result; And controlling the driving unit to close or open the switch unit when the instruction given to the control instruction unit is an on-off instruction. When the instruction given to the control instruction unit is a test instruction, And a microcomputer for communicating the status code of the part to the communication unit.

The speaker apparatus according to the present invention is characterized in that the control code is ASK-modulated to a first frequency and the status code is ASK modulated to a second frequency to receive or transmit, wherein the first frequency and the second frequency are between 18 kHz and 50 kHz Frequency.

In the speaker device according to the present invention, the speaker unit may include: an impedance converter connected to the speaker line at a primary side; And a speaker connected to a secondary side of the impedance conversion unit, wherein the sensing unit is connected to a secondary side of the impedance conversion unit to sense a state of the reference audio output signal.

In the speaker apparatus according to the present invention, it is preferable that the microcomputer judges an abnormal state caused by disconnection, short-circuit or short-circuiting of the speaker line according to the state of the sensed reference audio output signal.

The speaker device according to the present invention may further include a power source unit for generating an internal power source of the speaker device from the audio output signal.

According to an aspect of the present invention, there is provided a public address system comprising: a public address broadcasting apparatus for amplifying a broadcast signal and outputting an audio output signal; A speaker line branching from the public address broadcasting apparatus; And a speaker device connected to the speaker line for transmitting sound corresponding to the audio output signal.

The whole-body broadcasting system according to the present invention preferably includes a main communication unit that transmits the control code or receives a diagnosis result of the speaker unit.

According to another aspect of the present invention, there is provided a method of controlling a speaker device, the method comprising the steps of: inputting a control code for designating a speaker on-off mode or a speaker test mode, Transmitting to the device; Receiving the control code from the speaker device and identifying whether it is a control code; Determining whether the control code is a speaker on-off mode or a speaker test mode according to a control code when the control code is identified as a control code; If it is determined that the speaker is on-off mode, driving the switch unit to connect or open the speaker line and the speaker unit; Detecting a reference audio output signal transmitted to the speaker unit when the speaker test mode is determined; And transmitting the detection result to the public address broadcasting apparatus.

A speaker device capable of individually controlling according to the present invention, a whole-body broadcasting system using the same, and a speaker device control method using the same can be provided by separately turning on / off a plurality of speaker devices used in a public address system, It is possible to effectively designate the desired area and to easily maintain maintenance.

1 is a block diagram of a public address broadcasting system according to the prior art;
2 is a block diagram of a speaker device capable of individually controlling according to the present invention;
3 is a detailed block diagram of a control unit included in the speaker apparatus according to the present invention.
4 is an internal circuit diagram of a speaker unit included in a speaker device according to the present invention.
5 is a bit configuration diagram of a control code and a status code.
6 is a block diagram of a speaker apparatus according to the present invention further including a power supply unit.
7 is a block diagram of a public address system according to the present invention;
8 is a flowchart showing an example of a method of controlling a speaker device according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following detailed description is merely exemplary and is merely illustrative of preferred embodiments of the present invention.

2 is a block diagram of an individually controllable speaker device 100, in accordance with an embodiment of the present invention.

2, a speaker apparatus 100 according to the present invention is a speaker apparatus 100 connected to a speaker line 40 branched from a front office broadcast apparatus 200 to transmit sound, A switch unit 110 for connecting or disconnecting the speaker line 40 and the speaker unit 120, and a speaker unit 120 for extracting an audio signal from the audio output signal, And a control unit 130 for controlling the switch unit 110 or diagnosing the connection state of the speaker unit 120 according to the control code.

The speaker unit 120 is an element for receiving an audio output signal transmitted from the sound pipe broadcasting apparatus 200 through the speaker line 40 and outputting it as sound. As shown in FIG. 4, the impedance converting unit 121 And a speaker 122. In the case of a public address broadcasting system installed for the purpose of broadcasting in a large area, the speaker system 100 from the public address broadcasting apparatus 200 for transmitting an audio output signal is connected by a considerably long speaker line 40, The audio output signal from the speaker line 40 must be attenuated to a large extent. Therefore, the public address broadcasting apparatus 200 solves this problem by outputting an audio output signal at a high voltage and forcing it to the impedance conversion section 121 and connecting it to the speaker 122. The impedance transforming unit 121 may be implemented by a transformer in which the primary side is wound with more windings than the secondary side.

The switch unit 110 connects or disconnects the speaker line 40 and the speaker unit 120 according to a control signal of the control unit 130. By turning on or off the switch unit 110, the user can individually turn on or turn on the announcement broadcasts or the like transmitted from the public address broadcast apparatus 200 according to the area where the target persons of the announcement are located. The switch unit 110 may be an electronic switch using a relay, a latch relay, or a semiconductor device.

The control unit 130 extracts the control code from the audio output signal received via the speaker line 40 and controls the switch unit 110 or diagnoses the speaker unit 120 according to the control code, And transmits it to the public hall broadcast apparatus 200.

3, the control unit 130 may include a communication unit 131, a driving unit 132, a sensing unit 134, and a microcomputer 133 as a detailed configuration.

The communication unit 131 receives the control code from the front office broadcast apparatus 200 or diagnoses the speaker unit 120 and transmits the status code to the front office broadcast apparatus 200. [ The communication unit 131 can communicate with the public address broadcasting apparatus 200 by using the speaker line 40 in a serial communication manner. In addition, the communication unit 131 may be implemented using an RS-485 method in order to perform serial communication.

Here, the control code and the status code are digital codes exchanged between the front office broadcast apparatus 200 and the speaker apparatus 100 using the speaker line 40. The control code and the status code can be transmitted and received by the digital code itself, but in order to distinguish the audio output signal from the audio output signal in that the speaker line 40 is used together with the audio output signal, It is also possible to transmit and receive by modulating with frequency. Therefore, the frequency of the modulated signal is preferably in the range of 18 kHz to 50 kHz. In this case, the modulation scheme may be one of Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK).

FIG. 5 shows an example of a bit configuration diagram of a control code and a status code.

The control code includes an address portion to which an address of a predetermined speaker device 100 is assigned and a control command portion to which an instruction to be executed by the control portion 130 of the predetermined speaker device 100 is given. The command given to the control command unit may be an on-off command for connecting or disconnecting the speaker apparatus 100 to or from the speaker line 40. The control unit 130 may also check the connection state of the speaker apparatus 100 Lt; / RTI > The control unit 130 of the speaker device 100 may switch the switch unit 110 on or off in response to an on-off command from the speaker apparatus 100 at the address specified in the address unit, When the control command is a test command, the control unit 130 diagnoses the connection state of the speaker apparatus 100 with respect to the speaker apparatus 100 at the address specified in the address unit. The control code may further include a control code identifier for identifying whether the signal in the audio output signal is a general audio signal or a control code.

The status code includes an address portion to which an address of the speaker device 100 on which diagnosis has been performed and a status flag indicating the connection status of the speaker device 100 are included. When the speaker apparatus 100 receives the control code to which the test command is given, the speaker apparatus 100 at the address assigned to the address unit of the control code diagnoses whether the connection state with the public address broadcasting apparatus 200 is normal, And transmits the address and status flag of the public switched telephone network 200 to the front office broadcast apparatus 200. Whether the connection state is normal or not is determined by detecting whether the reference audio output signal sent from the public address broadcasting apparatus 200 is properly transmitted to the speaker 122 during the test command execution period. In the case where the speaker line 40 is in an abnormal state such as disconnection, short-circuit or short-circuit or short-circuit of the voice coil of the speaker 122, the reference audio output signal will be detected by the speaker unit 120 to be smaller than the reference value. The state of the speaker apparatus 100 can be diagnosed. The status code may further include a status code identifier to identify whether the signal received through the speaker line 40 is a status code,

The driving unit 132 is a component that outputs a driving signal so that the switch unit 110 is turned on or off in response to a control signal of the microcomputer 133. The driving unit 132 is a component for outputting a control code, The microcomputer 133 transmits a control signal for turning on or off the switch unit 110 to the driver 132 in accordance with the on-off command and the driver 132 drives the switch unit 110 are turned on or off. Through this operation, the speaker unit 120 is controlled to be connected to or opened from the speaker line 40.

The sensing unit 134 senses a reference audio output signal from the speaker unit 120 and outputs the sensed reference audio output signal to a predetermined reference value and a predetermined reference value when the speaker apparatus 100 receives the control code, Compare. When it is determined that the sensed reference audio output signal is smaller than the reference value, the microcomputer 133 determines that the speaker line 40 is disconnected, short-circuited, or short-circuited, or that the voice coil of the speaker 122 is in an abnormal state. 4, the sensing unit 134 may sense the reference audio output signal by being connected to the secondary side of the impedance conversion unit 121. However, the sensing unit 134 may sense the reference audio output signal from the primary side of the impedance conversion unit 121 It is also possible.

The microcomputer 133 receives the control code via the communication unit 131 and performs an operation corresponding to the control command unit when the address set in the address unit of the received control code is the address of the speaker device 100. [ When the command given to the control command unit of the control code is an on-off command, controls the driving unit 132 to close or open the switch unit 110, and when the command given to the control command unit is a test command, And transmits the status code of the speaker unit 120 reflecting the detection result of the controller 134 to the communication unit 131 and transmits the status code to the public address broadcasting apparatus 200.

The speaker device 100 according to the present invention may further include a power supply circuit for generating an internal power supply for driving the switch unit 110 and the control unit 130 included in the speaker device 100. FIG. 6 is a block diagram illustrating an embodiment in which the speaker unit 100 of the present invention further includes a power unit 140. The internal power source can be generated from a DC power source or an audio output signal stored in the speaker line 40. In particular, when the internal power source is generated from the audio output signal, it may include a rectifying unit for rectifying an AC output audio signal, and a switch-mode for down-converting or boosting the DC voltage rectified by the rectifying unit to an appropriate internal voltage And a power supply circuit (Switch-Mode Power Supply, SMPS). In addition, the power supply unit 140 may be a general linear regulator instead of the SMPS.

FIG. 7 is a block diagram of a public address system using a speaker device 100 according to the present invention.

7, the public address system according to the present invention includes an audio source 30, a public address broadcasting apparatus 200, a speaker line 40, and a plurality of speaker apparatuses 100. The public address broadcasting apparatus 200 includes a speaker communication apparatus 100 connected to the speaker line 40 and a main communication unit 230 for transmitting and receiving a control code and a status code. The main communication unit 230 may be included in any one of a public address broadcast control apparatus, an audio matrix, and a public address broadcast amplifier 210 included in the public address broadcast apparatus 200. The main communication unit 230 can mix and transmit a control code to the audio output signal during normal operation in which the hall way broadcasting apparatus 200 outputs the audio output signal. The public address broadcasting apparatus 200 may further include a signal selection unit 220 for selectively connecting the speaker line 40 to the main audio broadcasting amplifier 210 or the main communication unit 230. The signal selector 220 connects the speaker line 40 to the output terminal of the all-tube broadcasting amplifier 210 when the front-office broadcast apparatus 200 is operating normally by the general audio output signal, The user can transmit the control code by connecting the speaker line 40 to the main communication unit 230 or receive the status code from the speaker device 100 when the user wants to diagnose the state of the speaker device 100 .

FIG. 8 shows a control method for controlling the speaker apparatus 100 in the public address system according to the present invention.

Referring to FIG. 8, in order to control the speaker device 100, a public address system according to the present invention includes a step of transmitting, to the speaker device 100, a control code designating on-off or testing of the speaker 122 S100). At this time, the control codes are all transmitted to the plurality of speaker apparatuses 100 connected to the speaker line 40.

Each of the plurality of speaker devices 100 receiving the control code identifies the control code identifier included in the control code and identifies whether the received control code is a control code or a general audio output signal (S200).

When it is confirmed that the received signal is a control code, the control unit 130 confirms whether the command written in the control command unit of the control code is an on-off command of the speaker 122 (S300). If the control command is an on-off command, the control unit 130 controls the switch unit 110 to connect or disconnect the speaker unit 120 to the speaker line 40 according to the on-off command (S400).

 Although not shown in the drawing, the control unit 130 confirms the address written in the address part of the control code before executing the instruction given to the control instruction unit after being identified by the control code, Only perform control commands.

If it is determined that the received signal is the control code and the command described in the control command section of the control code is not an on-off command of the speaker 122, the control section 130 determines that the received command is a test command, (S500, S600). Although not shown in the drawing, the front office broadcasting apparatus 200 outputs the reference audio output signal for a predetermined time after transmitting the control code corresponding to the test mode. In the test mode, the sensing unit 134 of the speaker device 100 senses a reference audio output signal transmitted to the speaker unit 120 and compares the reference audio output signal with a preset reference value (S500). When it is determined that the sensed reference audio output signal is smaller than the reference value, the microcomputer 133 determines that the speaker line 40 is disconnected, short-circuited, or short-circuited, or that the voice coil of the speaker 122 is in an abnormal state, The state code is transmitted to the public address broadcasting system 200 through the communication unit 131 (S600).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

10, 100: Speaker device 20, 200: Public hall broadcasting device
30: Audio source 40: Speaker line
110: switch unit 120: speaker unit
121: Impedance conversion unit 122: Speaker
130: control unit 131:
132: driving unit 133:
134: sensing unit 140:
210: Public address broadcasting amplifier 220: Signal selection unit
230: main communication unit

Claims (10)

A speaker apparatus connected to a speaker line branched from a public address broadcasting apparatus to transmit sound,
A speaker unit for transmitting sound corresponding to an audio output signal output from the public address broadcasting apparatus;
A switch unit for connecting or disconnecting the speaker line and the speaker unit; And
And a control unit for controlling the switch unit according to a control code extracted from the audio output signal or sensing a reference audio output signal transmitted to the speaker unit and transmitting a detection result to the central office broadcast apparatus,
The control code includes:
An address unit to which an address designating the speaker device is assigned; And
And a control command unit to which an instruction to be performed by the control unit is given,
And the control unit executes a command given to the control command unit when the address given to the address unit matches the address of the speaker device set in advance.
delete The method according to claim 1,
Wherein,
A communication unit for receiving the control code from the public address broadcasting apparatus or for transmitting a status code of the speaker unit to the public address broadcasting apparatus;
A driving unit for driving the switch unit to connect or disconnect the speaker line and the speaker unit;
A sensing unit for sensing a state of the reference audio output signal transmitted to the speaker unit and outputting the sensing result; And
And controls the driving unit to close or open the switch unit when the instruction given to the control instruction unit is an on-off instruction. When the instruction given to the control instruction unit is a test instruction, And a microcomputer for transmitting the status code to the communication unit.

The method of claim 3,
Wherein the control code is ASK modulated to a first frequency and the status code is ASK modulated to a second frequency to receive or transmit, wherein the first frequency and the second frequency are between 18 kHz and 50 kHz.
The method of claim 3,
The speaker unit includes:
An impedance converter connected to the speaker line at a primary side thereof; And
And a speaker connected to the secondary side of the impedance conversion unit,
Wherein the sensing unit is connected to a secondary side of the impedance converting unit to sense a state of the reference audio output signal.
The method of claim 3,
Wherein the microcomputer determines an abnormal state due to disconnection, short-circuit, or short-circuit of the speaker line according to the detected state of the reference audio output signal.
The method according to claim 1,
And a power unit for generating an internal power source of the speaker device from the audio output signal.
A public address broadcasting apparatus for amplifying a broadcast signal and outputting an audio output signal;
A speaker line branching from the public address broadcasting apparatus; And
And a speaker device connected to said speaker line for transmitting sound corresponding to said audio output signal. 7. A public address broadcast system comprising: the speaker device according to any one of claims 1 to 7;
9. The method of claim 8,
Wherein the public address broadcasting apparatus includes a main communication section that transmits the control code or receives a diagnosis result of the speaker section.
8. A control method for controlling a speaker apparatus according to any one of claims 1 to 7,
Transmitting the control code to the speaker device to designate a speaker on-off mode or a speaker test mode;
Receiving the control code from the speaker device and identifying whether it is a control code;
Determining whether the control code is a speaker on-off mode or a speaker test mode according to a control code when the control code is identified as a control code;
If it is determined that the speaker is on-off mode, driving the switch unit to connect or open the speaker line and the speaker unit;
Detecting a reference audio output signal transmitted to the speaker unit when the speaker test mode is determined; And
And transmitting the detection result to the public address broadcasting apparatus.
KR1020160003511A 2016-01-12 2016-01-12 Individually controllable speaker apparatus, public addressing system and control method using thereof KR101627213B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102004688B1 (en) * 2019-03-08 2019-07-29 주식회사 썬더테크놀로지 System for protection of amp and prevention broadcast's block by the short circuit
KR102044119B1 (en) 2019-04-08 2019-11-12 정현 Apparatus and method for detecting disorder of speaker lines in a public address system
KR102049457B1 (en) 2019-04-04 2019-11-27 김종운 Adjusting apparatus for speaker broadcasting signal
KR102189265B1 (en) * 2020-05-04 2020-12-09 강순원 Digital broadcasting system capable of network-based digital remote maintenance
KR102599428B1 (en) 2023-06-02 2023-11-07 (주)진명아이앤씨 Energy-saving multi-amplifier module with output W control technology through V control

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990015641A (en) * 1997-08-08 1999-03-05 홍종만 Channel automatic tracking device of radio system and its control method
KR100850578B1 (en) * 2007-10-11 2008-10-27 주식회사 케빅 Public address system capable of monitoring speker
KR101289754B1 (en) * 2013-02-04 2013-07-26 (주)하이텍영상 Att speaker system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990015641A (en) * 1997-08-08 1999-03-05 홍종만 Channel automatic tracking device of radio system and its control method
KR100850578B1 (en) * 2007-10-11 2008-10-27 주식회사 케빅 Public address system capable of monitoring speker
KR101289754B1 (en) * 2013-02-04 2013-07-26 (주)하이텍영상 Att speaker system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102004688B1 (en) * 2019-03-08 2019-07-29 주식회사 썬더테크놀로지 System for protection of amp and prevention broadcast's block by the short circuit
KR102049457B1 (en) 2019-04-04 2019-11-27 김종운 Adjusting apparatus for speaker broadcasting signal
KR102044119B1 (en) 2019-04-08 2019-11-12 정현 Apparatus and method for detecting disorder of speaker lines in a public address system
KR102189265B1 (en) * 2020-05-04 2020-12-09 강순원 Digital broadcasting system capable of network-based digital remote maintenance
KR102599428B1 (en) 2023-06-02 2023-11-07 (주)진명아이앤씨 Energy-saving multi-amplifier module with output W control technology through V control

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