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Design and application of TV studio HD studio group

Design and application of TV studio HD studio group

Foreword: With the industrialization and group development of radio and television, on the basis of digitalization and informationization of television technology, the design and construction of studios are also moving towards clustering. The following is a brief introduction to the design and application of the HD News Studio Group of Hunan Radio and Television.

I. Design ideas

In order to meet the live broadcast of the news programs of multiple channels of Hunan Radio and Television Station, the recording of emotional interview programs, in order to improve the efficiency of program production, maximize the efficiency of equipment use, share the center equipment, and share the signal source program. Establish a group center computer room, the central computer room and the station master control to establish a high-speed multi-channel, each guiding room can flexibly share the multi-channel resources of the total control, and allocate regular channels according to the actual requirements of each computer room. Once major activities occur, they can be flexible. Concentrate all channel resources, expand the function of the computer room, and provide the best and most powerful technical support for the program.

Second, the system constitutes

Group structure

The HD News Studios consists of four studios: Studio No. 1, Studio No. 2, Studio No. 3, and Studio No. 4. The No. 1 and No. 2 studios are composed of 2 control and 2 studio groups: consisting of two sets of high-definition systems, two guiding rooms, and one equipment room. The two system devices are shared, that is, they can work alone, and they can complement each other and back up. Under normal circumstances, the two guiding rooms can simultaneously broadcast and record programs, and the studio devices 1 and 2 can also be shared. The studio cameras can be flexibly allocated according to the program needs, and the two guiding rooms can flexibly use the 1 and 2 studios; When equipment failure occurs, two levels of backup measures can be implemented. One is backup within the system, the switcher uses matrix emergency net switch backup, mixer, microphone, monitoring system, call system, player, hard disk broadcast, inscription, caption machine Equipment such as cameras, synchronous machines, and peripherals are redundantly backed up. The second is the backup between systems. When the main equipment of a guidance room fails, it can not be solved in a short time. You can use the KVM system to deploy a control room operation terminal (such as mouse, keyboard, display) to another guidance room for operation and output signals. It is deployed to another switching system and monitoring system through matrix, jumper, and the like. The other two studios can also be interconnected to extend the functionality of one pilot room to another to extend and refine the demand for demanding programming (such as seamless multi-level switching between studios, multiple effects, multiple windows, etc.) ).

3, 4 studio composition 1 control 2 studio group: consists of a set of high-definition system (plus a satellite panel and monitoring system), two guidance rooms, a equipment room. Under normal circumstances, the two guiding rooms can simultaneously broadcast and record programs, a set of high-definition system equipment is flexibly allocated to the main and auxiliary two guiding rooms, and a small net switching matrix is used to solve the problem of emergency switching between the main and auxiliary guiding rooms. The 128*128 large matrix of the shared group is used for signal scheduling. The transmission of the audio signal is networked, and the audio signal synchronized with the video is transmitted to the other group of the control room through the network node and the switch. The shared equipment of the group is placed in the central computer room (24-hour uninterrupted power supply rack), and the synchronization and cross-change of all external signals are completed by the intra-group shared cross converter.

2. Video system

The video system uses three SONY MVS-6000 switchers and one Harris 128*128 large matrix as the core of the system. The studio signal source is assigned to the switchboard and the shared matrix. The signal sources are: camera, player, network broadcast server, virtual system, graphic system, HD subtitle, HD online, total control external signal, VGA and other signals. 2 control 2 studio group has two SONY MVS-6000 switchers, respectively, 1 and 2 studio program production, 1 control 2 studio with a SONY MVS-6000 switcher and two 3M/E panels, two The panel shares a host, and the level 3 is assigned to the main and sub-guidance rooms for 3, 4 studio program production. The three x86s of Harris are serialized into a 128*128 large matrix to form a shared signal system, and the signals are uniformly distributed and up-and-down cross-converted. The signal source of the TV wall monitoring system adopts a fixed signal + matrix flexible scheduling mode. The common signal source directly enters the video wall, and other signal displays are provided by the flexible scheduling matrix. After the direct output of the switcher and the net switching output of the matrix pass 2*1, as the main path, the direct output of the switcher is used as the backup path, and the output signal is sent to the recording, broadcast, interface board, etc. after the final stage is allocated.

The video system framework and signal processing are shown in Figure 1:

figure 1

The 2 control 2 studio uses Tektronix two TG700 synchronous signal generators and one ECQ422D automatic synchronous inverter to adopt the automatic switching of the main and standby modes to ensure the reliability of the system. Two synchronous signals are sent to the 1 control 2 studio group. The two synchronous signals are used as the main and standby inputs of the synchronous signal generator, and the standby signal is not connected to the device, but serves as the standby signal. This design scheme mainly considers the characteristics of the synchronous signal generator and the inverter. The main and standby synchronous signal generators of the studio are only used as mutual backup of the devices, and are mutually switched when the synchronous signal generator has a problem. At the same time, due to the technical characteristics of the synchronous signal generator, when the synchronization source is lost, at least the original signal can be retained for a certain period of time without drifting, and an alarm prompt is issued, and there is sufficient time to connect the standby synchronization signal into the system. Keeping the four studios in the group in the same synchronization system to solve the problem that the intra-group signals are freely scheduled and no longer need to be locked synchronously.

The synchronization system framework is shown in Figure 2.

figure 2

3. Audio system

The audio system uses three YAMAHA DM2000 VCMs and three YAMAHA DM1000 VCMs as the core of the audio system. The transmission of the four studio audio signals is centered on the Cisco network switch. The audio signals to be exchanged by each studio are provided by the main and standby consoles. The auxiliary is selectively provided, and then the network node is converted into network data and transmitted to the destination network node. The studios 1 and 2 consist of a YAMAHA DM2000 VCM and a YAMAHA DM1000 VCM, respectively. The main and standby tuning systems, 4 sets of DPA wired microphones, 2 sets of Sennheiser wireless microphones, wired and wireless microphones are used for backup and pick up the host. Live sound. After all the audio sources in the studio have been assigned to the main and standby consoles, the output of the main and standby mixers is distributed to the recorder, network recovery, studio monitoring, etc. after embedding the video SDI signal. It is sent to the broadcast and the total control through the optical channel. Audio signal transmission between studios The audio signals matched by the video are sent by the main and standby mixers, converted into network data by Axia's analog audio interface (Analog Node), and transmitted by Cisco's WS-C3560-24TS-E switch. Go to the aiming studio's Analog Node and send it to the console. For high-security audio transmission (such as broadcast, etc.) or traditional embedded video SDI signal transmission, this can complement each other, which increases the safety factor, increases the transmission flexibility and reduces the system. The cost of integration.

Studio 3 consists of a YAMAHA DM2000 VCM mixer, 2 sets of DPA wired microphones, 1 set of Sennheiser wireless microphones and audio surrounds to form a 1 control 2 pilot control room tuning system; Studio 4 consists of a YAMAHA DM1000 VCM mixer. Two sets of DPA wired microphones, one set of Sennheiser wireless microphones and audio surrounds form a 1 control 2 sub-control room tuning system. The two sets of tuning systems can record programs independently, complement each other and back up. After all the audio sources in the studio are distributed, they enter the main and sub-guidance console mixers. The main and sub-mixer outputs are sent to the recorder, network recovery, studio monitor, etc. after the final stage distribution, embedded in the video SDI. After the signal is sent to the broadcast and the total control through the optical channel. The connection to the studio 1 and 2 tuning systems was also converted to network data by Axia's analog audio interface (Analog Node), which was transmitted to the Analog Studio of the destination studio via Cisco's WS-C3560-24TS-E switch.

The audio system framework and signal processing are shown in Figure 3:

image 3

4. Call system

The call system uses Axia's new network digital call system, based on computer IP technology, consisting of Ethernet platform, network internal call, network hotline, network audio shared transmission, combined with Axia's unique Livewire real-time network transmission technology. It can connect more external calling devices and signal program sources through standard Ethernet, which greatly increases the flexibility of program making calls. We use three Cisco WS-C3560-24TS-E switches, a routing management server software Axia PathfinderPro, a network equipment maintenance software Axia iProbe, and an HP computer as the network platform; network internal calls cover 1, 2 3, 4 studio, guidance room, equipment room, broadcast machine room, total control room, installed 20 10-station intercom intercom control panel (IC.10), 3 20-station intercom Main control panel (IC.20), 4 sets of headphone splitter Fostex PH-100 and wireless headphone monitor mipro mi-808, 4 analog audio interfaces Axia Analog Node, 4 mixing splitters Sonifex RB-DA4x5, 2 sets of control Interface Axia GPIO Node, 2 sets of calling software Axia SoftCom, to meet the guidance, audio, video, lighting, camera, subtitles, virtual, editing, monitoring, broadcast, master control and host's mutual call; by 4 networks The telephone coupler Telos NX-6 Pack and the mixer, telephone and speaker form a network hotline system; the network audio sharing transmission system consists of 4 analog audio interfaces Axia Analog Node, 4 microphone signal interfaces Axia Mic Node, 2 Routing control Axia X-Y Router, a remote monitoring software Axia iPlay, and a network virtual sound card driver Axia IP Drive Win0101 are used to realize the network transmission and remote communication of audio signals between 1, 2, 3 and 4 studios. It changes the traditional routing form, can make more different types of devices easier to connect, and uses only a few cables, easy to install, simple to set up, friendly interface and easy to operate; in addition, their price is usually only Half of the traditional call matrix, because the Ethernet switch eliminates the need for expensive proprietary chassis-like matrices, and installation costs are greatly reduced.

The call system framework and signal processing are shown in Figure 4:

Figure 4

three. Conclusion

With the development of digital video, audio technology, computer technology, network technology and other closely related technologies, studio technology is constantly developing and improving. From the linear structure of the previous traditional analog system, it has gradually evolved into a computer network, using a distributed structure centered on a broadband video server; the studio form has also evolved from a traditional closed structure to an open structure; the studio function is also a single Towards the development of clusters, the functions are becoming more and more powerful and the complexity is getting higher and higher, which will lead to the shortage of high-end technology compound talents in the studio. These are the problems that we need to solve in the future. B&P
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