KR100944182B1 - Apparatus and method of auto switching for public address broadcasting system with digital audio packet and recoding medium - Google Patents

Abstract

PURPOSE: An automatic switching apparatus for the failure of a broadcasting system of a digital audio packet, a method thereof and a recording medium are provided to enable a normal local broadcasting in a failure occurrence region. CONSTITUTION: Plural local amplifiers(130,130') receive a digital audio signal of a designated channel among audio packet signals, and converts the digital audio signal into an analog audio signal. After amplifying the converted signal, the amplified signal is outputted to an automatically-switched path. A preliminary local amplifier(140) receives a digital audio signal of the designated channel among the audio packet signals, and convert the digital audio signal into an analog audio signal. In addition, the preliminary local amplifier relays the audio packet signal in a backward direction, and speaker units(160,160') converts the applied audio signal into an audible signal.

Description

FIELD OF METHOD OF AUTO SWITCHING FOR PUBLIC ADDRESS BROADCASTING SYSTEM WITH DIGITAL AUDIO PACKET AND RECODING MEDIUM}

The present invention is to amplify by automatically switching to a preliminary local amplifier when any one of a plurality of local amplifiers constituting a PA (PUBLIC ADDRESS) broadcasting system using digital audio packets amplifies. It is a system and method for automatic failure switching of digital audio packet public address system that corrects the address, receives and amplifies the signal from the spare local amplifier, and outputs it to the speaker connected to the failed local amplifier to ensure normal premises broadcasting in the corresponding area. It is about.

The premises broadcasting system broadcasts the signals of contents including audio and video uniformly to the same contents in separate multiple areas, each designated area of multiple buildings, and the whole of wide areas. to be. The simultaneous broadcasting in a plurality of divided areas is called PA (PUBLIC ADDRESS) broadcasting.

In addition, in the transmission of a broadcast signal, a method of converting and transmitting a digital signal rather than an analog signal has an effect of improving signal-to-noise ratio and broadcasting clean sound quality.

The present invention relates to an premises broadcasting system that publicly broadcasts a digital audio signal, converts and amplifies an analog audio signal in each local amplifier, and outputs the same to a speaker. At this time, the present invention relates to a technology for automatically switching in real time to amplify the signal to be transmitted to the preliminary local amplification unit to be transmitted to the speaker connected to the failed local amplification unit.

In the prior art, when a failure (TROUBLE or FAILURE) occurs in a digital amplifier provided in any one of the areas broadcasted by the digital public address system, there is a problem in that the local broadcast signal cannot be heard.

That is, the prior art can diagnose (DIAGNOSTIC) that a failure occurs in the local amplifier of a particular region, but there is a problem that automatic switching to the spare amplifier is not made in real time.

Accordingly, there is a need to develop a technology for checking a broadcast signal in a corresponding area even when a digital amplifier provided in any one of the plurality of areas constituting the digital public address broadcasting system fails.

The present invention is to solve the problems and necessity of the prior art as described above, digital audio packet for automatically switching the output path to the spare path to output the applied signal through the spare path in the event of a failure of a specific local amplifier It is an object of the present invention to provide a system and method for automatically switching faults of public address broadcasting systems and a recording medium.

In addition, the present invention provides a failure automatic switching device, method and recording medium of a digital audio packet public address system for modifying (changing) a destination address of a digital audio signal to be transmitted to a failed local amplifier and relaying and amplifying and outputting it to a preliminary local amplifier. The purpose is to provide.

Another object of the present invention is to provide an automatic switching device, a method and a recording medium of a failure of a digital audio packet public address system for automatic switching because the switching relay drives the routing relay using the amplified audio signal. .

In order to achieve the above object, the present invention samples and synthesizes 48 KHz and 24 bit analog audio signals input through multiple paths, and configures the MAC layer according to the IEEE 802.3 Ethernet standard. It transmits the audio packet signal composed of TCP / IP protocol in the forward direction and transmits in the reverse direction through the central control unit, the central control unit and the UTP cable, and receives the digital audio signal of the designated channel among the audio packet signals. It converts and amplifies analog audio signals and outputs them through automatically switched paths. Audio packet signals are connected through a number of local amplification units relayed to the network, through a central control unit and a UTP cable. Receive audio signals and convert and amplify them into analog audio signals Automatic switching of the digital audio packet public address system comprising a preliminary local amplification unit for outputting and relaying the audio packet signal in a reverse direction, and a speaker unit for connecting the local amplification unit with a speaker cable and converting the applied audio signal into an audible signal. Present the device.

Preferably, the central control unit synthesizes a plurality of digital converters for inputting analog audio signals, sampling at 48 KHz, 24 bits, and converting them into digital audio signals, and digital audio signals applied from the digital converters by digital signal processing. According to the IEEE 802.3 Ethernet standard, the audio signal is composed of the MAC layer, the control and management signals are composed by the TCP / IP protocol, and the packet synthesizer converts and outputs the audio packet signal. A main control section for recording a preliminary local amplification section for recording a transmission destination address of an audio packet signal to be transmitted to a local amplifier having a failure, a memory section for recording data processed by the packet synthesis section and a program and data of the main control section, And clocks required by main control and systems A clock and packet synthesizer for generating and supplying a call, respectively, and outputs an audio packet signal to a network made of a UTIP cable in a matched state, and the input signal includes a network matcher for applying a matched state to a main control part. The management signal included in the audio packet signal transmitted in the reverse direction from the amplifier is analyzed and monitored, and the audio packet signal transmitted in the reverse direction is discarded after the analysis is completed.

Here, the main control unit is configured to switch the path so that the audio signal amplified by the preliminary local amplifying unit is applied to the speaker unit connected to the output terminal of the failed local amplifying unit.

In addition, the local amplification unit is connected to a network made of a UTP cable, transmits and relays an audio packet signal in a matched state, and receives a local control unit for reading and converting a digital audio signal of a designated channel into an analog audio signal, and receiving and amplifying the analog audio signal. And a switch unit for receiving the amplified analog audio signal and the amplified analog audio signal, and switching the output stage to connect to the normal path. The local controller monitors the switch unit to output the audio signal when the amplified audio signal is not normally output. The central control unit is notified by recording a failure in the allocated management area of the packet signal and notifying the central control unit. The switch unit is configured to connect the output terminal to the spare path when the amplified audio signal is not applied.

The preliminary local amplification unit connects to a network made of a UTP cable, transmits and reverses an audio packet signal in a matched state, and reverses the local packet. An analog amplification unit for receiving and amplifying and outputting the amplified analog audio signal, and a switch unit for receiving the amplified analog audio signal and outputting it through a path set by the control of the local control unit, wherein the local control unit monitors the switch unit and does not output the amplified audio signal normally. In this case, it is configured to record a failure in the assigned management area of the audio packet signal and notify the central control unit.

The preliminary local amplification unit is configured to apply the output audio signal to a plurality of local amplification units through a cascaded speaker cable.

On the other hand, the local amplifier receives the audio packet signal, reads the digital audio signal and the control signal from the designated channel and relays it in the forward direction. It consists of a configuration.

The local amplification unit is configured to record a failure state in a designated channel of the audio packet signal relayed in the reverse direction when the output of the amplified analog audio signal is monitored in real time and detected as a failure state that is not normally output.

In addition, when the audio signal is not normally output due to a failure, the local amplification unit is configured to switch the audio signal amplified by the preliminary local amplification unit to be output to the speaker unit to set a preliminary path.

The preliminary local amplifying unit is configured to output an analog audio signal amplified by a path switched by the control of the central control unit.

The present invention devised in order to achieve the above object, automatic switching operation of the digital audio packet public address system consisting of a central control unit, a UTP cable, a plurality of local amplification unit, a preliminary local amplification unit, a speaker cable, a speaker unit A method of inputting a plurality of analog audio signals, converting them into digital audio signals and synthesizing the selected signals by control and monitoring by a central control unit, the method comprising the steps of: The second step of recording the control and management signals and the destination signal in the designated channel and transmitting and relaying them to the local amplifier and the preliminary local amplifier of the destination and detecting that the analog audio signal amplified by the local amplifier is not output. Is automatically amplified by the preliminary local amplifier. Day and a third step of outputting a log audio signal to the speaker presents the failure automatic transfer operating method of a digital audio system comprising a packet public address.

Preferably, in the second step, when a local amplification unit having a failure is detected by the central control unit, destination information of a channel to be transmitted to the local amplifying unit is recorded as a preliminary local amplifying unit.

On the other hand, in the third step, when the local amplification unit having a failure is detected by the central control unit, the destination information recorded in the channel to be transmitted to the local amplification unit is recorded by the preliminary local amplifying unit.

In addition, the failed information is recorded in the designated channel of the audio packet signal relayed backward by the preliminary local amplifier.

The audio packet signal includes a start packet indicating the start of isochronous cycle data, three audio data packets in which eight channels of digital audio signals are recorded, an asynchronous data packet in which transmission and reception data for control and management are recorded, and a fault condition. It is characterized by an isochronous cycle including a control data packet to be recorded.

In order to achieve the above object, the present invention provides a recording medium which records a failure automatic switching operation method of a digital audio packet public address system which records the operation method according to any one of claims 11 to 15. present.

According to the present invention having the above configuration, when any one of the plurality of local amplifiers constituting the digital all-optical broadcasting system fails, the preliminary local amplifier is amplified and broadcasted in real time to the area where the failure occurred. There is an industrial use effect.

In addition, according to the present invention, the audio signal is divided into digital packet units and the transmission destination is designated using MAC header of the IEEE 802.3 Ethernet standard. It works.

In addition, the present invention having the configuration described above has a convenient effect in using the automatic switching of the output path of the audio signal without a separate power since the relay is driven using the current of the amplified and output audio signal.

The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may properly define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention. In addition, detailed descriptions and drawings of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

UTP (UNSHIELDED TWISTED PAIR) cable is a local area network (LAN) cable, which is made of twisted copper strands of 8 strands, and it is common to use an RJ-45 type jack as a terminal. SPEAKER CABLE is used to transmit AUDIO signal. It shields the outside in order to block the noise signal from the outside while sufficient thickness of the copper stranded wire so that sufficient current is transmitted. It is common to

MAC (MEDIA ACCESS CONTROL) is an operating system (OS) method that was mainly used to operate Apple computers and Macintosh computers.

The relay type switch SWITCH has a different characteristic from that of a contact connected when the operating current is supplied and a contact connected when the operating current is not supplied, and the present invention uses such a characteristic.

The IEEE (Institute of Electrical and Electronics Engineers) has promoted the standardization of LANs and generally applies the IEEE 802.3 Ethernet standard as the basis for organizing such data.

In case of configuring the data by packet method, the area to be recorded including the source, destination, size and type of data, configuration number of data, time, control and request information, etc. is called header area. The area in which the actual data to be recorded is called a payload area.

In the description of the present invention, "transfer" and "relay" are used in the same sense, "relay" is mainly used, and mixed contextually necessary.

1 is a functional configuration diagram of a failure automatic switching device of a digital audio packet public address system according to an example of the present invention.

Hereinafter, with reference to the accompanying drawings, the failure automatic switching device 100 of the digital audio packet public address system 100 is the central control unit 110, UTP cable 120, local amplifiers 130, 130 ' , A preliminary local amplifier 140, a speaker cable 150, and a speaker unit 160.

The central control unit 110 selectively samples analog audio signals input through multiple paths at 48 kHz and 24 bits, and synthesizes them selectively. HEADER) LAYER and control and management signals to transmit and receive audio packet signals composed of TCP / IP protocols, such as a plurality of digital conversion unit (ADC) 111, packet synthesis unit (DSP) 112, A main control unit (CPU) 113, a memory unit 114, a clock unit 115 and a network matching unit 116 is configured to include.

2 is a detailed functional configuration diagram of the central control unit in FIG. 1 according to an example of the present invention.

Hereinafter, with reference to the accompanying drawings, a plurality of digital converter 111 constituting the central control unit 110 inputs an analog audio signal and samples at 48 KHz and 24 bits (BIT). In general, audio signals range from 20 Hz to 20 KHz, sample at more than two multiples of the maximum frequency, and in the present invention sample at 48 KHz. At this time, since each sampled signal is converted into a 24-bit digital signal, the sampled value is recorded as a precise value.

The larger the number of bits, the larger the range of values that can be expressed. For example, 8-bit can be used to express up to 256 values separately, and 16-bit can be used to express up to 65,536 values, and 24-bit. Up to 16,777,216 values can be expressed separately. That is, the larger the number of bits, the more complicated and time-consuming configuration of the arithmetic processing is, but there is an advantage of faithfully improving the sound quality of the audio signal to the original sound. However, some of these allocated bits can be used for other purposes such as error checking.

The packet synthesizing unit 112 selectively combines the digital audio signals applied from the plurality of digital converting units 111 by the control and monitoring of the control unit 113 and converts them into packet signals according to the IEEE 802.3 Ethernet standard. Such a packet signal is called an audio packet signal of an isochronous cycle (ISOCHRONOUS CYCLE) in the present invention.

The audio packet signal includes a start packet indicating the start of data, three audio data packets, an asynchronous data packet in which transmission and reception data for control and management are recorded, and each channel. It includes a CONTROL data packet that records the fault condition. Eight channels of digital audio signals can be recorded in one audio data packet. In each channel information, equipment management information and fault status are recorded and configured by TCP / IP protocol, and digital audio data and daisy chain network information are configured by MAC layer recording, and are generally configured by IEEE 802.3 Ethernet standard. It demonstrates and demonstrates in detail in FIG.

The main controller 113 controls and manages the recording and reading of digital audio signals and data signals for control, management, transmission destination designation, etc. according to the IEEE 802.3 Ethernet standard of the packet synthesis unit 112.

In particular, the network matching unit 116 receives and analyzes the corresponding channel signal of the audio packet signal relayed in the reverse direction from each local amplification unit 130 to determine whether a failure state in which the amplified audio signal is not output.

At this time, if it is determined that a failure has occurred according to the analysis result, the transmission destination information of the digital audio signal recorded on the designated channel to be transmitted to the local amplification unit 130 is modified to be recorded and sent to the address of the preliminary local amplification unit 140. Control and monitor

In addition, the preliminary local amplification unit 140 is controlled to switch the path of the switch unit 136, so that the preliminary local amplification unit 140 self-amplifies the audio signal generated by the local amplification unit (TROUBLE). To the speaker units 160 and 160 'connected to output terminals 130 and 130'. Each speaker unit 160, 160 ′ is connected to an output terminal of each local amplifier 130, 130 ′ and a speaker cable 150.

The preliminary local amplification unit 140 may be provided at a designated location of the site or at a nearby location of the central control unit 110.

The memory unit 114 records the data generated by the packet synthesizing unit 112 and the main control unit 113, programs necessary for operation, and data in the allocated areas, respectively.

The clock unit 115 generates and supplies a clock signal required by the packet combiner 112, the main controller 113, and the system, respectively.

The network matching unit 116 outputs the audio packet signal of the packet synthesizing unit 112 in a matching state to a network consisting of the UTP cable 120, and the input signal is matched to the main control unit 113. Is applied.

It is called forward (FORWARD DIRECTION) relay that the audio packet signal is relayed in the order configured from the central control unit 110 from which the audio packet signal is generated to the preliminary local amplifying unit 140 via the plurality of local amplifying units 130 and 130 '. REVERSE DIRECTION relay is a reverse direction in the reverse direction of the forward direction, in the order configured from the preliminary local amplification unit 140 to the central control unit 110 via the plurality of local amplification units 130 and 130 '. .

In the audio packet signal relayed in the reverse direction, failure state information, a request signal, and the like are recorded in a corresponding region of each channel designated by the local amplifiers 130 and 130 'and the preliminary local amplifier 140, respectively.

At this time, the main control unit 113 is the failure state information that is returned and requested (REQUEST) to each of the local amplifier 130, 130 'and the preliminary local amplifier 140 for each channel from the audio packet signal relayed in the reverse direction, After reading the request signal and the like and taking the corresponding measures, the control is completed so that it can be discarded and disappeared.

1, UTP cable 120 is used in a general LAN (LAN) is composed of twisted copper strands of 8 strands, it is common and necessary to use a terminal for the RJ-45 type terminal Other forms may be used.

The local amplifiers 130 and 130 'are connected through the central control unit 110 and the UTP cable 120, receive digital audio signals recorded in a designated channel among audio packet signals, convert and amplify them into analog audio signals. Outputting and relaying the received audio packet signal to another local amplifying unit 130 or a preliminary local amplifying unit 140 of the network, thereby connecting the local control unit 132, the analog amplifying unit 134, and the switch unit 136. It will be described in detail with reference to Figure 3 below.

The preliminary local amplifier 140 includes a local controller 142, an analog amplifier 144, and a switch 146 in a similar configuration to the local amplifiers 130 and 130 ′. It explains in detail.

3 is a detailed functional configuration diagram of the local amplifier in FIG. 1 according to an example of the present invention.

Hereinafter, with reference to the accompanying drawings, the local control unit 132 constituting the local amplification unit (130, 130 ') is connected to the network consisting of the UTP cable 120 and matching the audio packet signal (MATCHING) It transmits / receives in the state and repeats and reads the digital audio signal of the designated channel and converts it into analog audio signal. At this time, the control and management signals and data are read together from the designated channel to perform the corresponding control and necessary processing.

After reading the digital audio signal, the control and management signal and the data from the designated channel, the audio packet signal is forwarded to the local amplifiers 130 and 130 'or the spare local amplifier 140 configured in the following order by the system (FORWARD DIRECTION). REPEAT FORWARD DIRECTION RELAY AND REVERSE DIRECTION RELAY WILL BE REVERSE IN THE TRANSMISSION DIRECTION AND RELAY WILL RECOMMEND Either of the Two.

The analog amplifier 134 amplifies the analog audio signal applied from the local controller 132 to a predetermined predetermined level and outputs it to the switch unit 136.

The switch unit 136 switches from the analog amplifying unit 134 to a normal path when a signal of a predetermined level or more, which is arbitrarily designated by the design, is applied, and switches a spare path if no signal is applied. PATH) and the speaker unit 160 connected to the speaker cable 150 is connected to the output terminal of each path.

That is, the relay constituting the switch unit 136 is operated by the current of the amplified and output analog audio signal, so when the analog audio signal to be output is normally applied, it is automatically switched to a normal path (AUTO. SWITCHING), If the analog audio signal to be output is abnormally applied or not applied, it is automatically switched to the spare path.

In addition, the preliminary terminals of the switch unit 136 provided in other adjacent local amplifiers 130 and 130 'are connected to each other in a daisy chain or cascade manner. In this connection, since the amplified audio signal is transmitted, the speaker cable 150 is used.

At this time, the local controller 132 monitors the switch unit 136 to confirm (detect) whether the amplified analog audio signal is normally output, and to relay the fault state signal in the reverse direction when it is detected that the amplified analog audio signal is not normally output. Since the packet signal is recorded in the designated channel, the central control unit 110 is notified.

4 is a detailed functional configuration diagram of the preliminary local amplifier in FIG. 1 according to an example of the present invention.

Hereinafter, with reference to the accompanying drawings, the preliminary local amplifier 140 is configured to include a local controller 142, an analog amplifier 144 and the switch unit 146, local amplifiers 130, 130 It has a similar configuration and function as').

In detail, the local controller 142 reads the digital audio signal from the channel specified by the destination address information of the audio packet signal and reads the analog audio signal, similar to the local controller 142 provided in the local amplifier 130. The signal is converted and applied to the analog amplifier 144.

However, there is a difference in directly controlling the switching state of the switch unit 146. This switching is controlled by extracting, analyzing and controlling the control and management signals read from the specified channel of the audio packet signal.

Since the analog amplification unit 144 has the same configuration and function as the analog amplification unit 134, it will not be described repeatedly.

The switch unit 146 switches the path PATH from the OFF state to the ON state under the control of the local control unit 142, and in the state of switching to the ON state, the analog amplification unit 144. ) Outputs the amplified analog audio signal, and the output analog audio signal is a spare path provided in the switch unit 136 of the adjacent local amplifiers 130 and 130 'connected in a daisy chain or cascade manner. SPARE PATH).

As such, the audio signal amplified by the preliminary local amplifier 140 due to the state in which the output terminal of the switch unit 146 and the preliminary path of each switch unit 136 are daisy-chained or cascaded is connected to the local amplifier having a failure ( 130 and 130 'are applied to the output terminal and the corresponding speaker unit 160. This wiring state will be described again with reference to FIG. 5 below.

FIG. 5 shows an example of the present invention, in which each switch unit of the local amplification unit and the preliminary local amplification unit is connected by a speaker cable.

Hereinafter, with reference to the accompanying drawings, the output terminal of the switch unit 146 is connected to the preliminary path of the switch unit 136 ′, and again connected to the preliminary path of the switch unit 136 in a daisy chain or cascade manner. The state is made between all local amplifiers 130 and 130 'and the preliminary local amplifier 140 constituting the system.

For example, referring to the accompanying drawings, the first local amplification unit 130 has a failure state, and the digital device is configured in the IEEE 802.3 Ethernet standard packet unit by the destination address modified by the preliminary local amplification unit 140. Digital audio signals are read from a specified channel of the audio signal, converted to analog, amplified and output.

At this time, the switch unit 146 is switched from the dotted line state to the on state of the solid line state by the switching control of the local control unit 142, and the switch unit provided in the second local amplification unit 130 'in the normal state. 136 ′ is switched to the normal path shown by the solid line, and the switch unit 136 included in the first local amplifier 130 in the fault state is the spare path shown by the solid line. Transfer.

That is, the signal output from the switch unit 146 is applied to the switch unit 136 'but is not transferred to the output terminal because it is switched to the normal path, and the signal applied to the switch unit 136 is transferred to the spare path. Therefore, it is supplied to the speaker 160 connected to the output terminal and is converted into an audible signal and output.

Therefore, the automatic audio switching amplifies the analog audio signal to be output from the local amplification unit 130, 130 'has failed, and outputs the amplified local amplification unit 140 to the corresponding speaker in the area where the failure occurs.

FIG. 6 is a diagram showing the overall configuration of an audio packet signal by an isochronous cycle according to an example of the present invention.

Hereinafter, with reference to the accompanying drawings, the audio packet signal 180 is transmitted in an isochronous cycle (ISOCHRONOUS CYCLE).

The audio packet signal 180 by each isochronous cycle (ISOCHRONOUS CYCLE) is composed of a start packet 181, an audio data packet 182, an asynchronous data packet 183, and a control data packet 184.

The start packet 181 marks the start of isochronous cycle data constituting the audio packet signal. It is common for the start packet 181 to be filled with meaningless arbitrary designations.

The audio data packet 182 is divided into an Ethernet protocol area, a MAC header area, a sync time area, and eight channels, and records digital audio data according to the IEEE 802.3 Ethernet standard. A channel audio data (CH. AUDIO DATA) area, a control data area, and a CRC area for checking a transmission error.

The audio data packet 182 may be configured in three audio packet signals 180 by one isochronous cycle, but may be increased or reduced as necessary. At this time, the transmitting side and the receiving side share the corresponding information.

Each channel audio data (CH. AUDIO DATA) area constitutes a control management signal of the equipment and a signal for checking a fault occurrence state by the TCP / IP protocol as shown below. In addition, the digital audio data to be transmitted and the DAISY CHAIN network information to be supported are configured according to the IEEE 802.3 Ethernet standard.

7 is a flowchart illustrating a method for automatically switching over a failure of a digital audio packet public address system according to an example of the present invention.

Hereinafter, with reference to the accompanying drawings, a plurality of analog audio signals are input and converted into digital audio signals by the control and monitoring of the central control unit 110. In this case, a part or all audio signals selected from the converted plurality of audio signals are synthesized to form a single signal (S210).

The digital audio signal is recorded in a designated channel of the audio packet signal 180 according to the IEEE 802.3 Ethernet standard, and the signal and destination information for control and management are recorded together (S220).

In addition, the central control unit analyzes the information returned from the plurality of local amplification unit (130, 130 ') and checks whether the detection of the local amplification unit having a failure (S230).

In this case, when the local amplification unit having a failure is confirmed by the analysis, the destination address of the channel to be transmitted to the local amplification unit having the failure is modified and recorded as the address of the preliminary local amplification unit 140 (S240).

The audio packet signal 180 thus completed is transmitted and relayed to a plurality of local amplifiers and preliminary local amplifiers by isochronous cycles (ISOCHRONOUS CYCLE) and transmitted to the destination (S250).

Here, each local amplification unit receives the audio packet signal 180 and reads all the signals of the channel designated to itself, and then relays them to the adjacent local amplification unit. Relay is relayed immediately if there is no signal of the designated channel.

On the other hand, the relayed audio packet signal 180 reads the digital audio signal from the channel designated by the corresponding local amplifier, converts it into an analog audio signal, amplifies and outputs it, and detects whether the analog audio signal is output (S260).

In this case, when the amplified analog audio signal is not normally output, a failure state occurs, and the switch unit of the local amplification unit which detects such a failure state is automatically switched to the spare path. That is, the path is automatically switched to output the audio signal amplified and applied from the preliminary local amplifier to the connected speaker (S270).

As described above, the local amplification unit which detects the failure state records the failure state and the required request signal in the designated channel of the audio packet signal 180 which is relayed in the reverse direction and relays it again in the reverse direction (S280).

Since the audio packet signal 180 is transmitted to and analyzed by the central control unit, it recognizes which local amplification unit has failed and takes necessary countermeasures by the central control unit.

The method configuration as described above may be recorded and operated in a memory consisting of RAM or ROM, and may be recorded in a removable memory such as a USB memory, a CD, a diskette, a tape, and the like to be operated in a required system.

Therefore, in a public address system that broadcasts a wide or separated spatial area by a plurality of local amplifiers, if a failure occurs in any one of the local amplifiers, the preliminary local amplifier receives and amplifies the corresponding signal, There is an advantage to output through the speaker unit is located.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made within the technical scope of the present invention, and such modifications and modifications belong to the appended claims.

1 is a functional configuration diagram of a failure automatic switching device of a digital audio packet public address system according to an example of the present invention;

2 is a detailed functional configuration diagram of the central control unit in FIG. 1 according to an example of the present invention;

3 is a detailed functional configuration diagram of the local amplification unit in FIG. 1 according to an example of the present invention;

4 is a detailed functional configuration diagram of the preliminary local amplifier in FIG. 1 according to an example of the present invention;

FIG. 5 is an example of the present invention and shows a state in which each switch unit of the local amplification unit and the preliminary local amplification unit is connected with a speaker cable; FIG.

6 is a diagram showing an overall configuration state of an audio packet signal by an isochronous cycle according to an example of the present invention;

And

7 is a flowchart illustrating a method for automatically switching over a failure of a digital audio packet public address system according to an example of the present invention.

          ** Explanation of symbols on the main parts of the drawing **

100: failure automatic switching device of digital audio packet public address system

110: central control unit 111: digital conversion unit

112: packet synthesis unit 113: main control unit

114: memory section 115: clock section

116: network matching unit 120: UTP cable

130, 130 ': local amplifier 132, 142: local controller

134, 144: analog amplifier 136, 146: switch

140: spare local amplifier 150: speaker cable

160, 160 ': speaker unit 180: audio packet signal

181: start packet 182: audio data packet

183: asynchronous data packet 184: control data packet

Claims (16)

48 KHz, 24 bit are sampled and synthesized by multiple audio paths, and the audio layer is composed of the TCP / IP protocol. Central control unit for discarding the transmitted in the reverse direction; It is connected to the central control unit via a UTIP cable, receives a digital audio signal of a specified channel among the audio packet signals, converts and amplifies an analog audio signal, and outputs it through an automatically switched path. The audio packet signal is relayed to a network. A plurality of local amplifiers; A preliminary local amplification unit connected to the central control unit through the UTP cable, receiving a digital audio signal of a specified channel among audio packet signals, converting and amplifying and outputting an analog audio signal, and relaying the audio packet signal in a reverse direction; And A speaker unit connected to the local amplifier and a speaker cable and converting an applied audio signal into an audible signal; Failure automatic switching device of the digital audio packet public address system comprising a. According to claim 1, wherein the central control unit, A plurality of digital converters for inputting the analog audio signal, sampling the 48 KHz, 24 bit, and converting the analog audio signal into a digital audio signal; The digital audio signal applied from the digital converter is synthesized by digital signal processing, the audio signal is composed of the MAC layer by the IEEE 802.3 Ethernet standard, and the control and management signals are composed by the TCP / IP protocol. A packet synthesis unit; A main controller for recording the transmission destination address of an audio packet signal to be transmitted to the failed local amplifier by connecting to the packet synthesis unit and monitoring the local amplifier for checking that a failure has occurred; A memory unit for recording the data processed by the packet synthesizing unit and the program and data of the main control unit; A clock unit for generating and supplying clock signals required by the packet synthesis unit, the main control unit, and the system, respectively; And A network matching unit for outputting an audio packet signal of the packet synthesizing unit in a matching state to a network made of the UTP cable and applying the input signal in a matching state to the main control unit; Including, Analyze and monitor the management signal contained in the audio packet signal transmitted from the plurality of local amplification unit in the reverse direction, The audio packet signal transmitted in the reverse direction is discarded after the analysis is completed, characterized in that the automatic switching device for a digital audio packet public address system characterized in that the configuration. delete The method of claim 1, wherein the local amplification unit, A local controller for connecting to a network of the UTP cable, transmitting and receiving the audio packet signal in a matched state, and converting the digital audio signal of a designated channel into an analog audio signal; An analog amplifier for receiving and amplifying and outputting the analog audio signal; And A switch unit for receiving the amplified analog audio signal and switching the output terminal to a normal path to output the amplified analog audio signal; Including, If the amplified audio signal is not normally output by monitoring the switch unit, the local controller records a failure in the assigned management area of the audio packet signal and notifies the central control unit. And the switch unit is configured to connect the output terminal to a spare path when the amplified audio signal is not received from the analog amplification unit. The method of claim 1, wherein the preliminary local amplifier, A local controller for connecting to a network of the UTP cable, transmitting and receiving the audio packet signal in a matched state, and relaying the reverse signal, and reading and converting a digital audio signal of a designated channel into an analog audio signal; An analog amplifier for receiving and amplifying and outputting the analog audio signal; And A switch unit receiving the amplified analog audio signal and outputting the changed path through a control path of the local controller; Including, The local control unit is configured to monitor the switch unit and record the failure in the assigned management area of the audio packet signal when the amplified audio signal is not normally output and notify the central control unit. Automatic switching device of audio packet public address system. The method of claim 5, wherein the preliminary local amplifier, And a plurality of local amplifiers configured to apply the output audio signal through a cascaded speaker cable. The method of claim 4, wherein the local amplification unit, Receives the audio packet signal, reads the digital audio signal, control signal from the designated channel and relays in the forward direction. Failure automatic switching device of the digital audio packet public address system, characterized in that. The method of claim 7, wherein the local amplification unit, Digital audio packet public broadcasting system, characterized in that when the output of the amplified analog audio signal is monitored in real time and detected as a failure state that is not normally output, the failure state is recorded in a designated channel of the audio packet signal relayed in the reverse direction. Breakdown automatic switching device. The method of claim 8, wherein the local amplification unit, If the audio signal is not normally output due to the failure, the audio signal amplified by the preliminary local amplifier is switched to be output to the speaker unit, and the preliminary path is set. Switching device. The method of claim 6, wherein the preliminary local amplifier, A failure automatic switching device for a digital audio packet public address system, characterized in that it comprises a configuration for outputting an analog audio signal amplified in a switched path by the control of the central control unit. In the failure automatic switching operation method of the digital audio packet public address system consisting of the central control unit, youtube cable, a plurality of local amplification unit, preliminary local amplification unit, speaker cable, speaker unit, A first step of inputting a plurality of analog audio signals, converting them into digital audio signals, and synthesizing the selected signals by control and monitoring of the central control unit; A second step of recording the digital audio signal including a control and management signal and a destination signal in a designated channel of an audio packet signal according to the IEEE 802.3 Ethernet standard, and transmitting and relaying the local and preliminary local amplification units of a destination; And A third step of automatically switching to a preliminary path and outputting the amplified analog audio signal amplified by the preliminary local amplifying unit to a speaker unit when detecting that the analog audio signal amplified by the local amplifying unit is not outputted; Failure automatic switching operation method of the digital audio packet public address system comprising a. The method of claim 11, wherein the second step, And when the local amplification unit having a failure is detected by the central control unit, recording destination information of a channel to be transmitted to the local amplification unit as a preliminary local amplifying unit. The method of claim 11, wherein the third step, And when the local amplification unit having a failure is detected by the central control unit, destination information recorded in a channel to be transmitted to the local amplifying unit is recorded as a preliminary local amplifying unit. The method of claim 13, wherein the information in which the failure occurs, And the preliminary local amplifying unit records the designated channel of the audio packet signal relayed in the reverse direction. The method of claim 14, wherein the audio packet signal, A start packet indicating the start of isochronous cycle data, three audio data packets in which eight channels of digital audio signals are recorded, an asynchronous data packet in which transmission and reception data is recorded for control and management, and a control data packet recording a fault condition. A failure automatic switching operation method of a digital audio packet public address system, characterized in that it is an isochronous cycle comprising. 16. A recording medium recording a method for automatically operating a malfunction switching system of a digital audio packet public address system, which records the operation method according to any one of claims 11 to 15.

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