KR960007211B1 - Stereo audio broadcasting system for optical catv - Google Patents

Abstract

an audio signal dividing means 2 for dividing analog/digital audio signals of plural channels into two channels; an audio decoding/coding means 4 for decoding/coding the audio signals from the audio signal dividing means 2 and a demultiplexed signal; an audio multiplexing means 8 for outputting DS3 audio multiplexed data to an optical transmitter 13 by a sync clock from a sync clock generator 14; an audio demultiplexing means 9 for demultiplexing the audio multiplexed data into audio coded data of plural channels in order to monitor the transmission state; an alarm collecting means 10; a monitor channel selecting means 11; an audio level displaying means 3 for receiving the multi-channel analog audio signals from the audio coding/decoding means 6 and displaying the level of the audio signal; and a sync clock selecting and dividing means 12.

Description

Stereo Audio Broadcasting System for Optical Cable Television

1 is a block diagram of a stereo audio broadcasting system for optical CATV according to the present invention.

* Explanation of symbols for main parts of the drawings

1: audio program provider 2: audio signal distributor

3: Audio level indicator 4: Audio code / decoder

5: audio encoder 6: audio decoder

7: Audio Multiplexer / Demultiplexer 8: Audio Multiplexer

9: audio demultiplexer 10: alarm collector

11: supervisory channel selector 12: sync clock selector and divider

13: optical transmission device 14: synchronous clock generator

15: Maintenance system for optical CATV 16: Broadcasting monitoring and control device

17: Stereo audio broadcasting system for optical CATV

The present invention relates to a stereo audio broadcasting system for an optical cable television capable of broadcasting an analog or digital audio signal of 14 channels in the form of a digital signal through an optical CATV network.

Prior to the present invention, the "stereo audio transmission device for CATV" (1992 Patent Application No. 13306) is designed to multiplex 14-channel analog or digital audio signals to DS3, a North American transmission rate layer. It is capable of transmitting and demultiplexing and decoding DS3 level data output to monitor the audio transmission status, but there is no automatic replacement function in case of an error that might affect the service during broadcasting, so it can cause service interruption in case of an error. In addition, since the channel for monitoring the audio transmission status or the fault condition is not provided in the broadcasting operation room, it cannot be actually used as a broadcasting system.

Accordingly, the present invention devised to solve all the problems of the prior art has the function of transmitting 14-channel audio signal to DS3 level in the stereo audio broadcasting for optical CATV, while preventing the interruption of service in the event of a failure during the broadcast operator The purpose of the present invention is to provide a stereo audio broadcasting system for optical CATV that can monitor an alarm about a fault occurring in a transmission system or monitor the transmission status of a selected audio channel.

In order to achieve the above object, the present invention provides an audio program providing means for generating an analog or digital audio signal of a plurality of channels, an optical transmission device having an output of a stereo audio broadcasting system for optical CATV, and a clock required for audio multiplexing. Provides a synchronous clock generating device, a maintenance system for optical CATV that inputs an alarm signal for a fault occurrence in a stereo broadcast system for an optical CATV, and an alarm signal and monitoring for a fault occurrence for a stereo broadcast system. A broadcast monitoring and control device for receiving an analog stereo audio signal is provided.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a block diagram of a stereo audio broadcasting system for optical CATV according to the present invention, in which 1 is an audio program provider, 2 is an audio signal divider, 3 is an audio level indicator, 4 is an audio code / decoder, and 5 is an audio encoder. , 6 is an audio decoder, 7 is an audio multiplexer / demultiplexer, 8 is an audio multiplexer, 9 is an audio demultiplexer, 10 is an alarm collector, 11 is a monitoring channel selector, 12 is a synchronous clock selector and splitter, 13 is an optical transmitter, 14 denotes a synchronous clock generator, 15 denotes a maintenance system for optical CATV, 16 denotes a broadcast monitoring and control device, and 17 denotes a stereo audio broadcasting system for optical CATV.

As shown in the figure, the stereo audio broadcasting system includes an audio program provider 1 for outputting 14-channel analog or digital audio signals to a stereo audio broadcasting system for optical CATV, and the audio program provider 1 as described above. An optical CATV stereo audio broadcasting system 17 for receiving an analog / digital audio signal from and receiving a synchronous clock and a monitoring channel selection signal and outputting DS3 audio multiplexed data, an alarm signal and a monitoring audio signal; An optical transmission device 13 having an output of the CATV stereo audio broadcasting system 17 as an input, a synchronization clock generator 14 outputting a clock for audio multiplexing to the optical CATV stereo audio broadcasting system 17, A synchronization clock generator 14 for outputting an audio multiplexed clock to the optical CATV stereo audio broadcasting system 17; The optical CATV maintenance system 15 which inputs an alarm signal regarding the occurrence of a failure generated in the optical CATV stereo audio broadcasting system 17, and the failure generated in the optical CATV stereo audio broadcasting system 17. It consists of a broadcast monitoring and control device (16) which receives an alarm signal and a monitoring analog stereo audio signal for generation, wherein the optical CATV stereo audio broadcasting system (17) is an analog / digital audio signal of 14 channels. An audio signal divider (2) used for distributing the signal into two channels, an audio encoder (5) for receiving and encoding audio signals from the audio signal divider (2), and the audio encoder (14) of fourteen channels. Multiplex audio data (44.736Mb) by receiving the audio data (3.072 Mbps) from the system and multiplexing it by the 44.736MHz synchronization clock from the sync clock generator l (14). a multiplexer 8 for outputting ps) to the optical transmission device 13, and demultiplexing the audio multiplexed data output to the optical transmission device 13 into 14 audio coded data for monitoring the transmission status An audio decoder (6), an audio decoder (5) and an audio decoder (6) which input encoded audio data from the audio demultiplexer (9), and output the decoded analog audio signal. An audio coder / decoder (4) provided, an audio multiplexer / demultiplexer (7) comprising the audio multiplexer (8) and an audio demultiplexer (9), and an alarm generated by the synchronization clock selection and divider (12). From the audio decoder 6 in the audio coder / decoder 4 of the 14-channel audio collector / decoder 4 to collect and output to the maintenance system 15 for optical CATV and the broadcast monitoring and control device 16. 14 channels Surveillance channel selector 11 for outputting one channel selected by the broadcast monitoring and control device 16 from the analog audio signal to the broadcast monitoring and control device 16, and 14 channels from the audio decoder 6; An audio level indicator (3) for receiving a log audio signal as an input and indicating a level of the audio signal, and receiving a synchronization clock for audio multiplexing from the synchronization clock generator (14) in the audio multiplexer / demultiplexer (7). It consists of a synchronous clock selection and divider 12 which provides a synchronous clock to the multiplexer 8.

Referring to the operation process composed of the above configuration, the audio signal distributor 2 distributes the stereo analog signal or the digital audio signal from the audio program provider 1 into two signals, each of which is divided into two signals per channel. After the audio coder / decoder has been inputted and encoded by the audio coder 5 in the audio coder / decoder 4 which is operating simultaneously, the output from one of the two encoders is selected and two audio multiplexer / demultiplexers are selected. It is input to the audio multiplexer 8 in the audio multiplexer / demultiplexer 7 which is operating simultaneously. The audio multiplexer 7 receives the encoded audio data of 14 panels as input and multiplexes to DS3 level by selecting the synchronous clock and synchronous clock from the divider 12, and then outputs one of the two outputs to the optical transmission device ( 13). The multiplexed audio data multiplexed and output by the audio multiplexer 8 is inputted to the audio demultiplexer 9 in the audio multiplexer / demultiplexer 7, and is inputted by the audio demultiplexer 9. It is demultiplexed into audio data of the channel and then input to the audio decoder 6 in the code / decoder 4. After decoding by the audio decoder 6, the decoded analog audio signal is again input to the audio level indicator 3 and the audio signal is again input to the audio level indicator 3 to indicate the level of the audio signal. In addition, the monitoring channel selector 11 is also output to the broadcast monitoring and control device 16 of one of the 14 monitoring audio signals selected by the broadcast monitoring and control device 16 is output. The audio encoder 5 and the audio multiplexer 8, which are duplicated in a structure of a hot stand-by during operation, are outputted from one of the two audio encoders 5 and When a failure occurs in the audio multiplexer 8, an alarm signal is generated, output is interrupted, and data is output from the audio encoder 5 and the audio multiplexer 8, which are waiting for operation. The alarm signal for the fault generated from the audio coder / decoder 4, the audio multiplexer / demultiplexer 7, the synchronous clock selection and divider 12, etc. is output to the alarm collector 10, and then maintained for optical CATV. Outputted to system 15 and broadcast monitoring and control device 16.

Next, an audio signal divider (2), an audio level indicator (3), an audio code / decoder (4), an audio multiplexer / demultiplexer (7), and a synchronous clock which constitute a stereo audio broadcasting system 17 for an optical CATV are selected. And the distributor 12, the alarm collector 10, and the monitoring channel selector 11. FIG.

The audio signal divider 2 is configured to simultaneously provide an analog stereo audio signal and a digital audio signal from an audio program provider 1 to the audio code / decoder 4, in which two code / decoders are operated simultaneously. It has a function of distributing each analog audio signal and digital audio signal into two.

The audio level indicator 3 has a function of receiving an analog audio signal from the audio decoder 6 in the 14 pairs of the audio code / decoder 4 as an input and displaying the level of the audio signal.

The audio coder / decoder 4 encodes an audio signal from the audio signal splitter 2 while two channels are operated simultaneously with each other, and then one audio coder / decoder of the outputs from the two coders / decoders. Data from is output to the audio multiplexer / demultiplexer 7. If an error occurs due to a failure of the code / decoder outputted to the multiplex / demultiplexer 7, the output audio code / decoder generates an alarm and stops output of the audio data. By this alarm generation, audio data from the audio coder / decoder on the other hand is output to the audio multiplexer / demultiplexer 7. The audio coder / decoder, which was waiting, was operating and waiting and cannot be switched without interrupting service. For audio service of 14 channels, 14 pairs or 28 audio encoders 5 and audio decoders 6 are required. The audio level indicator 3 and the monitoring channel selector 11 are outputted for broadcast monitoring.

The audio multiplexer / demultiplexer 7 simultaneously selects and outputs DS3 audio multiplexed data from one of the two while operating simultaneously. If the selected audio multiplexer / demultiplexer fails, the output audio multiplexer / demultiplexer generates an alarm and stops output of DS3-class audio multiplexed data. By this alarm generation, DS3 class audio multiplexed data from the audio multiplexer / demultiplexer which was waiting on the other side is selected and outputted to the optical transmission device. The audio multiplexer / demultiplexer, which was in standby, was in standby while operating normally and can be switched without interruption of service. The 14-channel code and audio data are multiplexed to DS3 level, and then DS3 line coded (BSZS) and outputted to the optical transmission device 13. The output DS3-class audio multiplexed data is demultiplexed again for monitoring and outputs 14 channel audio data and a clock to the 14 pairs of audio coder / decoder 4.

The sync clock selector divider 12 receives two 44.736 MHz sync clocks from the sync clock generator 14 and selects one of two clocks to distribute from the audio multiplexer / demultiplexer 7. Has the function to

The alarm collector 10 is provided with an alarm from 14 pairs of the audio code / decoder 4, an alarm from one pair of the audio multiplexer / demultiplexer 7, from the synchronous clock selector and divider 12. And collects the alarms and outputs them to the maintenance system 15 for optical CATV and the broadcast monitoring and control device 16.

The monitoring channel selector 11 monitors and monitors one channel of the audio signal selected by the broadcast monitoring and control device 16 among the 14 channels of analog audio signals from the 14 pairs of the audio code / decoder 4. Output to the control device 16.

Therefore, the present invention has the effect of enabling the broadcasting of 14-channel audio programs in an optical CATV network or the like.

Claims (1)

Audio program providing means (1) for outputting multiple channels of analog or digital audio signals to a stereo audio broadcasting system for optical CATV; Stereo audio for optical CATV which receives the analog / digital audio signal from the audio program providing means 1 and receives the synchronization clock and the monitoring channel selection signal and outputs DS3 audio multiplexed data, an alarm signal and a monitoring audio signal. A broadcasting system 17; An optical transmission device (13) for inputting the output of the optical CATV stereo audio broadcasting system (17); A synchronization clock generator (14) for outputting an audio multiplexed clock to the optical CATV stereo audio broadcasting system (17); An optical CATV maintenance system 15 for inputting an alarm signal for occurrence of a failure generated in the stereo audio broadcasting system 17 for the optical CATV; And a broadcast monitoring and control device (16) for inputting an alarm signal for occurrence of a disturbance occurring in the optical CATV stereo audio broadcasting system (17) and an analog stereo audio signal for monitoring. The broadcasting system 17 includes: audio signal distribution means 2, which is used to distribute multiple channels of analog / digital audio signals to two channels, respectively; Audio decoding / coding means (4) for receiving an audio signal from said audio signal distribution means (2) and inputting a demultiplex signal to decode / encode; Audio multiplexing means for receiving audio data from the audio decoding / coding means 4 as an input and outputting DS3 audio multiplexed data to the optical transmission device 13 by a synchronous clock from the synchronous clock generator 14; (8); Audio demultiplexing means (9) for demultiplexing the audio multiplexed data output to the optical transmission device (13) to the multiplexed audio coded data for monitoring the transmission state; An alarm collecting means (10) which collects the alarms generated by the synchronous clock selection and distribution means (12) and outputs them to the maintenance system (15) for the optical CATV and the broadcast monitoring and control device (16); Broadcast monitoring and control device for selecting one channel selected by the broadcasting monitoring and control device 16 from the analog audio signals of the multiple channels from the audio decoder 6 in the audio code / decoding means 4 of the multiple channels ( Supervisory channel selecting means (11) for outputting to 16; Audio level display means (3) for receiving a multi-channel analog audio signal from said audio code / decoding means (6) as an input and displaying the level of the audio signal; And a synchronous clock selection and distribution means (12) for receiving a synchronous clock for audio multiplexing from the synchronous clock generator (14) and providing a synchronous clock to the audio multiplexing means (8). Stereo audio broadcasting system for television.