KR101992293B1 - Digital Amplifier Device with real-time detection and Automatic Switching Broadcasting System using it - Google Patents

Abstract

The present invention relates to a digital amplifier device capable of real-time detection of an abnormality of a digital amplifier by using a ripple signal generated by a switching operation of the digital amplifier, and an automatic switching broadcasting system using the same. The digital amplifier device detects a faulty digital amplifier in real time without a delay in the event of a fault, switches the fault digital amplifier to a spare amplifier, and returns the spare amplifier to the original digital amplifier when the problem of the faulty digital amplifier is solved, thereby having a structure simpler than the conventional detecting device. The digital amplifier device checks the fault in real time due to no delay time occurring in detecting a test signal, and prevents generation of POP-ON noise occurring at the time of applying a test frequency and POP-OFF noise occurring at the time at which the test frequency is ended. The present invention comprises a digital amplifier, a detection unit, and a control unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a digital amplifier device capable of real-time detection and an automatic switching broadcasting system using the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital amplifier device capable of real-time detection of the presence or absence of a digital amplifier using a ripple signal generated by a switching operation of a digital amplifier, and an automatic switching broadcasting system using the same.

2. Description of the Related Art Generally, a public address broadcasting system using a digital amplifier is used in a case where a plurality of speakers installed in a near or remote place are controlled by a single management system in order to transmit a plurality of sounds. , A school, a performance hall, and an apartment, and transmits sound signals related to announcements such as announcements and emergency situations through a plurality of speakers.

One of the important roles of the broadcasting system is to detect the failure of the internal circuitry which operates the amplifier and speaker in real time in order to evacuate the people in the building to the safe place through the evacuation broadcasting in case of emergency. It is very important to maintain operation.

Korean Patent Registration No. 10-1829193 discloses a broadcasting system for solving the above-mentioned problems in an apparatus and method for diagnosing an amplifier failure in a multiple broadcasting system, A test frequency signal generator for generating a test frequency that is out of the audible frequency is provided to detect the impedance value of the transmitted test frequency signal that passes through the circuit of the digital amplifier and the speaker line, And the like.

Such a conventional broadcasting system judges whether or not a failure occurs at the time of the inspection, not at the time of occurrence of the failure of the amplifier, and can not respond quickly when a fire or an emergency occurs. Thus, the normal operation of the broadcasting system can not be maintained in real- A problem arises.

In addition, in the conventional broadcasting system, when the input terminal is disconnected due to the failure of the amplifier, the disconnected amplifier returns from a temporary failure such as power off, temporary operation due to heat generation, power failure of the amplifier, There is a limitation that it can not cope with it.

Korean Patent Registration No. 10-1829193 (Amplifier Fault Diagnosis Device and Method of Multivariate Broadcasting System, Aug. 28, 2018)

SUMMARY OF THE INVENTION The present invention provides a digital amplifier device capable of detecting a failed digital amplifier in real time without a delay time when a fault occurs by using a ripple signal generated by a switching operation of a digital amplifier .

The present invention also provides an automatic switching broadcast system that switches a failed digital amplifier to a spare amplifier and returns to the original digital amplifier when the problem of the failed digital amplifier is resolved.

According to an aspect of the present invention, there is provided a digital amplifier apparatus comprising: a switching unit for performing a switching operation based on an applied input signal to output a switching output signal having a pulse width modulation; And a filtering unit for outputting the amplified output signal, and a detector connected to an output terminal of the digital amplifier for detecting a ripple signal generated by the switching operation of the digital amplifier, And a controller for receiving a ripple signal and determining a failure of the digital amplifier, wherein the digital amplifier performs a switching operation in which the switching unit repeatedly repeats at a predetermined frequency even if the input signal is not applied, In an operating state in which an input signal for the switching operation of the amplifier is input, Wherein the switching unit detects a ripple signal remaining in the amplified output signal based on the input signal and outputs the ripple signal in a standby state in which an input signal for switching operation of the digital amplifier is not inputted, And the control unit detects a ripple signal remaining in the output signal, and if the ripple signal is not detected, the control unit determines that the digital amplifier is in failure, thereby detecting a real time abnormality of the digital amplifier regardless of whether the input signal is input .

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In addition, the detection unit is connected in series to an output terminal of the filtering unit, and detects a ripple signal from a low frequency component that has passed through the filtering unit.

The detection unit is connected in parallel to an output terminal of the filtering unit, and detects a ripple signal from a high frequency component that has passed through the filtering unit.

The detecting unit is connected between the switching unit and the filtering unit of the digital amplifier, and detects a ripple signal from the switching output signal of the switching unit.

In this case, the detector may filter the output signal of the switching unit and extract a ripple component from the output signal.

In addition, the automatic switching broadcasting system of the present invention using the digital amplifier device according to the present invention receives the failure signal of the digital amplifier judged by the control unit of the digital amplifier device, and connects the input / output stage of the failed digital amplifier to the spare amplifier And an input / output switching section for switching the input / output switching section to an input / output switching section.

At this time, the digital amplifier is made up of at least one digital amplifier including a first digital amplifier, and the controller determines that the first digital amplifier fails if a ripple signal is not detected from the first digital amplifier, When the ripple signal is detected again from the first digital amplifier determined as the failure, the switching unit returns the connection of the input / output terminal connected to the preamplifier to the first digital amplifier in which the ripple signal is detected again.

The broadcasting system may further include a speaker for outputting an output signal received from the digital amplifier and a speaker line for connecting the digital amplifier and the speaker to extract a ripple signal of a current generated by the switching operation of the digital amplifier And a speaker line checking unit for checking whether or not the speaker line is abnormal.

The speaker line checking unit may further include a line switching unit for receiving an abnormal signal of the tested speaker line and switching the connection state of the speaker line.

The present invention according to the above-described configuration has a simpler structure than the conventional detecting apparatus having a test signal generator by using a ripple signal generated by the switching operation of the digital amplifier, It is possible to inspect faults in real time due to no delay time and POP-ON noise occurring at the time of applying the test frequency and POP-OFF noise occurring at the end of the test frequency are not generated.

In addition, since a separate input signal is not applied to the digital amplifier, it is possible to check in real time whether or not a faulty digital amplifier returns by using a ripple signal generated from a digital amplifier switching at a constant frequency.

1 is a block diagram of a digital amplifier device according to an embodiment of the present invention;
2 to 4 are circuit diagrams showing a digital amplifier according to various application examples of the digital amplifier device of the present invention.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]
6 is a flowchart showing a method of detecting an abnormality in a broadcasting system according to FIG.
FIG. 7 is a block diagram illustrating an automatic switching broadcast system according to another embodiment of the present invention; FIG.
8 is a flowchart showing a method of detecting an abnormality in the broadcasting system according to FIG.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, the technical idea of the present invention will be described more specifically with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the technical concept of the present invention, are incorporated in and constitute a part of the specification, and are not intended to limit the scope of the present invention.

FIG. 1 is a block diagram of a digital amplifier device according to an embodiment of the present invention. FIGS. 2 to 4 are circuit diagrams showing digital amplifiers according to various application examples of the digital amplifier device of the present invention. Referring to FIG. 4, a digital amplifier device 100 capable of real-time fault detection of the present invention includes a digital amplifier 110 for repeatedly switching a predetermined frequency and amplifying an output, A detection unit 120 for detecting a ripple signal generated by the switching operation of the digital amplifier 100 and a control unit for receiving a ripple signal detected by the detection unit 120 and determining a failure of the digital amplifier 110, (130).

The digital amplifier 110 is configured to amplify a signal in a digital state and output an output signal. The digital amplifier 110 includes a switching unit 111 for performing a switching operation based on an applied input signal and outputting a switching output signal having a pulse width modulation And a filtering unit (112) for low-pass-filtering the switching output signal of the switching unit (111) and outputting an amplified output signal of the input signal. The switching unit (111) And outputs the modulated switching output signal to the filtering unit 112. The filtering unit 112 converts the output signal of the switching unit 120 (Ripple) remaining in the rectified DC component, and outputs the output signal to the outside. The digital amplifier 110 may further include a pulse modulator for pulse-modulating an input signal applied as an analog signal and converting the input signal into a digital signal. The modulation scheme of the pulse modulator 110 and the modulation scheme of the pulse modulator 110 are input to the digital amplifier 110 The components of the input signal may be variously modified without departing from the gist of the present invention.

That is, the digital amplifier 100 divides the input signal into a frequency for sampling the input signal so as to switch between a HIGH side in which the + power is applied in the power part and a LOW side in which the power is applied and a switching regulator, And a switching element (MOSFET). When the switched waveform is filtered using an inductor and a capacitor of the filtering unit 112, a ripple signal in the form of an output small sinusoidal wave Is output. In this case, the sampling frequency is preferably set to about 200 KHz to 600 KHz, and the sampling frequency can be changed according to the designer and the designer of the digital amplifier 110, but the output ripple signal is large and small But it is always output. Accordingly, if the ripple signal at the output terminal of the digital amplifier 110 is used, the ripple signal is generated if the digital amplifier 110 is normally operating. Therefore, when the ripple signal at the output terminal of the digital amplifier 110 is used, It is possible to detect the abnormality of the digital amplifier 110 without applying a square wave test signal.

The sampling unit 113 includes a low-pass filter (LPF) using a capacitor connected in parallel with an inductor connected in series with an output terminal of the switching unit 112, and the output of the switching unit 120 The signal is filtered by a low-frequency DC signal that can be output from the speaker. At this time, the sampling unit 113 can adjust the voltage of the ripple signal output according to the specification of the inductor and the capacitor, and is designed to be output in the form of a small sine wave within 5v, Malfunction of the digital amplifier 110 can be reduced. At this time, the voltage and current of the ripple signal to be outputted are due to the sampling frequency set by the switching unit 112 and the specifications of the inductor and capacitor of the filtering unit 113. That is, the detection unit 120 can detect the failure of the digital amplifier 110 using a sampling unit 113 provided in the digital amplifier 110, without any additional equipment.

The detection unit 120 may be realized by a measuring device such as a conventional oscilloscope or a multimeter for detecting the ripple signal connected to the output terminal of the digital amplifier 100. Preferably, A circuit for detecting the voltage or current of the ripple signal flowing through the output terminal of the control unit 100 and changing the detected voltage or current to a direct current component recognizable by the control unit 130 and being mounted on the digital amplifier 110, The controller 130 detects a ripple signal generated by the switching operation of the switching unit 112 repeatedly at a predetermined frequency even though no input signal is applied to the digital amplifier 110, The presence or absence of abnormality can be checked in real time.

2, the detection unit 120 may be connected in series to the output terminal of the filtering unit 113 of the digital amplifier 110 to detect the ripple signal from the filtered low frequency components, As shown in FIG. 3, the ripple signal can be detected from the filtered high-frequency component by being connected in parallel to the output terminal of the filtering unit 113. At this time, the filtering unit 113 may be connected in series to a capacitor connected in parallel to the output terminal, and may detect a ripple signal applied to the capacitor.

4, the detection unit 120 is connected between the switching unit 112 and the filtering unit 113 of the digital amplifier 110, and outputs the switching output signal of the switching unit 112 The detection unit 120 may filter the output signal of the switching unit 112 to detect the ripple signal from the switching unit 112 and the filtering unit 113, It is preferable to extract the ripple component converted from the switching output signal of the rectifying circuit 112 into the DC component. As described above, the detection unit 120 is configured to filter a ripple voltage within a predetermined voltage range to be distinguished from normal noise. In this case, the filtering circuit in the detection unit 120 outputs only the ripple component remaining in the sampling frequency May be composed of various bandpass filters for detection.

In the idle state in which no input signal is input to the digital amplifier 110, ripple is generated in the form of a small sin wave within the rated voltage designed for the digital amplifier 110. [ When the input signal is inputted to the digital amplifier 110, the output signal is outputted a current equal to or higher than the set voltage. Here, the output signal includes a sampling frequency according to the switching operation, and a ripple signal filtered from the output switching signal is generated. The detector 120 extracts a ripple signal in a frequency range that can be detected from the output signal Can be performed. That is, in a idle state in which no input signal is input to the digital amplifier 110, a ripple signal corresponding to the switching output signal is detected to determine whether the digital amplifier is abnormal, Only the high frequency components of the amplified output signal are amplified based on the input signal, amplified in the detection unit 120, rectified, and the ripple signal is extracted and transmitted to the controller 130, Real-time abnormality of the amplifier 110 can be detected.

FIG. 5 is a block diagram illustrating an automatic switching system according to an embodiment of the present invention. FIG. 6 is a flowchart illustrating a method of detecting an anomaly in a broadcasting system according to FIG. 5. Referring to FIGS. 5 and 6 The automatic switching broadcasting system 1000 includes the digital amplifier 110, the detection unit 120, the control unit 130, the speaker 200, the main broadcasting control unit 300, the preamplifier 400, and the input / output switching unit 500 ).

The speaker 200 is configured to output an output signal received from the digital amplifier 110. The speaker 200 outputs the output signal from one digital amplifier 110 through the output switching unit 520 of the input / Output signals may be transmitted through a plurality of speakers 200 installed at different places and a plurality of digital amplifiers 110 may be connected to one speaker 200 so that the output signals are appropriately switched Lt; / RTI >

The main broadcasting control unit 300 controls the overall operation of the broadcasting equipment when a topic or an emergency occurs. The main broadcasting control unit 300 controls all major controls such as a topic zone, an emergency broadcasting station, a zone to be broadcasted, . In this case, the conventional broadcasting system includes a time setting unit for setting an inspection time of the digital amplifier 110 in the main broadcast control unit 300, thereby instructing the main broadcast control unit 300 to transmit a test frequency used for an inspection out of the audible frequency, The broadcast system 1000 of the present invention performs a real-time check regardless of the inspection time by using a ripple signal generated by the self-switching operation of the digital amplifier 110, There is an advantage that it does not interfere with the signal. The preamplifier 400 transmits a command signal received from the main broadcast controller 300 to the digital amplifier 110 and performs a function of selecting a volume and a channel of an output signal.

The input / output switching unit 500 is configured to receive a failure signal of the digital amplifier judged by the control unit of the digital amplifier device and to switch the connection between the failed input / output stage of the digital amplifier and the preamplifier. For switching the connection to the speaker (200) to the switched preamplifier (200) by interrupting the connection to the failed digital amplifier (510) for switching the input signal to the preamplifier And an output switching unit 520. In this case, the digital amplifier 110 may include a plurality of preamplifiers 110e, and the preamplifier 110e may be provided in a standby state in which input / output terminals of the plurality of digital amplifiers 110 are not connected It can be used as any digital amplifier.

At this time, the digital amplifier 110 includes at least one digital amplifier including a first digital amplifier 110a. If the ripple signal is not detected from the first digital amplifier 110a, The input / output switching unit 500 judges that the first digital amplifier 110a is out of order. When the ripple signal is detected again from the first digital amplifier 110a determined as the failure, the input / 6, the method of detecting an abnormality of the broadcasting system 1000 may include the steps of: detecting the presence or absence of an abnormality in the broadcasting system 1000; and returning the connection to the first digital amplifier 110a where the ripple signal is detected again. The first digital amplifier 110a detects a ripple signal from the first digital amplifier 110a and determines that the first digital amplifier 110a fails if the ripple signal is not detected in step S110. ) To a preamplifier ( 110e. Thereafter, the ripple signal of the preamplifier 110e is detected to detect in real time whether or not the preamplifier 110e is operated (S112). On the other hand, when a ripple signal is detected from the first digital amplifier 110a The preamplifier 110e determines the normal operation of the first digital amplifier 110a and confirms the connection between the preamplifier 110e and the input / output switching unit 500. At this time, The digital amplifier 110a is switched to the preliminary amplifier 110e by switching to the first digital amplifier 110a which is normally operated when the input / output stage is connected to the first digital amplifier 110a by the first digital amplifier 110a , The connection which was switched when the failed digital amplifier 110a is operating normally is restored, and the spare amplifier 110e can be used again as a spare. Accordingly, the broadcasting system 1000 according to the present invention can solve the problem that can not be immediately responded to in the conventional broadcasting system, and can further facilitate the operation of the broadcasting system and the rapid propagation of the emergency situation.

FIG. 7 is a block diagram showing an automatic switching system according to another embodiment of the present invention. FIG. 8 is a flowchart showing a method of detecting an error in a broadcasting system according to FIG. 7, and FIG. 7 and FIG. 8 A speaker 200 connected to the output terminal of the digital amplifier 110 for detecting a ripple signal generated by a switching operation of the digital amplifier 110, An amplifier control unit 630 for receiving the ripple signal detected from the amplifier detection unit 620 and determining a failure of the digital amplifier 110 and an amplifier control unit 630 for determining a failure of the digital amplifier 110, And an input / output switching unit 640 for receiving a failure signal from the digital amplifier 110 and switching the connection between the input and output terminals of the failed digital amplifier 110 to a preamplifier. The digital amplifier check unit 600 and the digital amplifier 1 A speaker line inspecting unit 700 connected to a speaker line connecting the speaker 10 and the speaker 200 to detect a ripple signal generated by the switching operation from the digital amplifier 110 to check whether the speaker line is abnormal, . ≪ / RTI > The speaker line inspecting unit 700 includes a line detecting unit 710 connected to the speaker line Ls to detect a ripple signal of the speaker line Ls and a speaker line Ls detected from the line detecting unit 710. [ A line controller 720 receiving a ripple signal of the speaker line Ls and determining an abnormal state of the speaker line Ls and a speaker line Ls receiving an abnormal signal of the speaker line Ls determined by the line controller 720, And a line switching unit 730 for switching the connection state of the speaker amplifier Ls and the speaker line Ls to detect whether the digital amplifier 110 is malfunctioning or not. The amplifier control unit 630 and the line control unit 720 may be integrated into one digital amplifier device 100. In addition, the digital amplifier check unit 600 and the speaker line checking unit 700 may be built in one digital amplifier device 100, And receives signals from the amplifier detection unit 620 and the line detection unit 710 to determine whether there is an abnormality in each of the digital amplifiers 110 and the speaker line Ls.

8, the method for detecting abnormality of the broadcasting system 1000 including the digital amplifier check unit 600 and the speaker line checking unit 700 will be described in more detail. The broadcasting system 1000 includes the first digital It is determined that the ripple signal from the amplifier 110a is detected (S100). If the ripple signal is not detected, it is determined that the first digital amplifier 110a is faulty (S110), and the failed first digital amplifier 110a And switches to the amplifier 110e. Thereafter, the ripple signal of the preamplifier 110e is detected to detect in real time whether or not the preamplifier 110e is operated (S112). On the other hand, when a ripple signal is detected from the first digital amplifier 110a The preamplifier 110e determines the normal operation of the first digital amplifier 110a and confirms the connection between the preamplifier 110e and the input / output switching unit 500. At this time, The digital amplifier 110a is switched to the preliminary amplifier 110e by switching to the first digital amplifier 110a which is normally operated when the input / output stage is connected to the first digital amplifier 110a by the first digital amplifier 110a , A series of operations of the digital amplifier check unit 600 that operates to restore the connection that was switched when the failed digital amplifier 110a operates normally and to use the spare amplifier 110e again in reserve The digital amplifier 110, The speaker line Ls is inspected. That is, it is preferable to confirm whether the speaker line Ls is normal or not when the digital amplifier 110 is normally operated. If the voltage value output from the digital amplifier 110 is not measured, When the voltage value of the digital amplifier 110 is measured, the current value of the output ripple signal is measured. If the current value is not measured, the speaker line Ls is disconnected (S200 to S210) When the current value is measured in the detected speaker line Ls, the ripple voltage Vr is measured using the current value measured by the line detector 710, and at this time, It is determined that the speaker line Ls is short-circuited if the ripple voltage Vr is greater than the set rated voltage Vo and the measured ripple voltage Vr is less than the set rated voltage Vo The speaker line (Ls) The speaker line Ls judged to be short-circuited or disconnection is disconnected by the line switching unit 730 so that the speaker line Ls judged to be short-circuited or short- It is possible to prevent malfunction of other speaker lines operating normally and errors of the digital amplifier device 100.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1000: Automatic switching broadcasting system
100: Digital Amplifier Device
110: Digital amplifier 111:
112:
110a: first digital amplifier 110e: spare amplifier
120: detecting unit 130:
200: Speaker
300: main broadcast control unit 400: preamplifier
500 input / output switching unit 510 input switching unit
520: Output switching section
600: Digital amplifier test section 620: Amplifier detection section
630: Amplifier control unit 640: I /
641: Input switching section 642: Output switching section
700: Speaker line inspecting unit 710: Line detecting unit
720: line control unit 730: line switching unit

Claims (11)

A switching unit for performing a switching operation based on an applied input signal and outputting a switching output signal having a pulse width modulation; and a filtering unit for performing low-pass filtering on the switching output signal of the switching unit to output the amplified output signal A digital amplifier;
A detector connected to an output terminal of the digital amplifier for detecting a ripple signal generated by a switching operation of the digital amplifier; And
A controller receiving a ripple signal detected by the detector and determining a failure of the digital amplifier;
/ RTI >
The digital amplifier performs a switching operation in which the switching unit repeats at a predetermined frequency even though the input signal is not applied,
Wherein:
Wherein a ripple signal remaining in an amplified output signal based on the input signal is detected in an operating state in which an input signal for switching operation of the digital amplifier is input,
A ripple signal remaining in an output signal outputted by a switching operation of the switching unit repeated at a predetermined frequency is detected in a standby state in which an input signal for switching operation of the digital amplifier is not input,
Wherein if the ripple signal is not detected, the controller determines that the digital amplifier is in failure, thereby detecting a real-time abnormality of the digital amplifier regardless of whether the input signal is input or not. A possible digital amplifier device.
delete delete The method according to claim 1,
Wherein the detection unit is serially connected to an output terminal of the filtering unit and detects a ripple signal from a low frequency component that has passed through the filtering unit.
The method according to claim 1,
Wherein the detection unit is connected in parallel to an output terminal of the filtering unit and detects a ripple signal from a high frequency component that has passed through the filtering unit.
The method according to claim 1,
Wherein the detection unit is connected between the switching unit and the filtering unit of the digital amplifier and detects a ripple signal from the switching output signal of the switching unit.
The method according to claim 6,
Wherein the detection unit extracts a ripple component from the output signal by filtering the output signal of the switching unit.
delete A detection unit connected to an output terminal of the digital amplifier for detecting a ripple signal generated by a switching operation of the digital amplifier, and a control unit for applying a ripple signal detected by the detection unit to the digital amplifier, And a control unit for determining a failure of the digital amplifier; And
An input / output switching unit for receiving a failure signal of the digital amplifier judged by the control unit of the digital amplifier device and switching the connection between the input / output stage of the failed digital amplifier to the spare amplifier;
, ≪ / RTI &
The digital amplifier includes at least one digital amplifier including a first digital amplifier,
The control unit determines that the first digital amplifier fails if the ripple signal is not detected from the first digital amplifier,
Wherein the input / output switching unit returns the connection of the input / output terminal connected to the preamplifier to the first digital amplifier in which the ripple signal is detected again when the ripple signal is detected again from the first digital amplifier judged as the failure. Transition broadcasting system.
10. The method of claim 9,
A speaker for outputting an output signal transmitted from the digital amplifier; And
A speaker line inspecting unit connected to a speaker line connecting the digital amplifier and the speaker to extract a ripple signal of a current generated by the switching operation of the digital amplifier and checking whether the speaker line is abnormal;
Wherein the automatic switching broadcast system comprises:
11. The method of claim 10,
Wherein the speaker line checking unit further comprises a line switching unit for receiving an abnormal signal of the tested speaker line and switching a connection state of the speaker line.

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