Optical transmission in the broadcast of a variety of applications – Optical, radio and television transmission, application – Communications Industry
China Radio and TV Is in the transition from analog to digital stage. Digital brings audiences the greatest feeling is to improve program quality, program more colorful. Today, people are becoming more and more television programs, not just receive the TV signal on it, also called the perfect picture and lifelike sound.
This end, advanced camera, recording, editing, broadcasting and digital devices is important, but if not resolved
Transmission equipment The signal delay of the "bottleneck" problem, all in vain. Generally, municipal
TV station Analog transmission equipment, as components of the aging Ershi equipment greatly increased instability, often caused by transport disruptions seriously affect the normal signal transmission and quality. Therefore, full consideration of advanced equipment, compatibility, based on the overall matching of the signal transmission system to a digital device mainly will have to use analog devices can not match advantage.
Live In the live television broadcast, digital transmission can be separated into two ways.
Figure 1 The first is the front-end recording, transmission and post-
Make All digital equipment (Figure 1). Its composition is: (1) to obtain the signal source, (race
Venues ) Determine the production of television signals to digital equipment (digital
OB Van ) Dominated; (2) signal transmission to digital
Optical fiber Transmission main (with SDI fiber transmission), other secondary (key broadcast), the signal provided to the press center, the broadcast
Television Structure to use, and provide a variety of functions
Service . Our SDI-1000 series digital video transmission system is characterized by: compensation loop circuit
Transmitter ; Two retiming receiver output; single-mode environment can be transmitted 60km; the whole process of signal transmission quality degradation, can satisfy the requirements in this way. This seamless connection, you can ensure maximum video / audio quality.
Figure 2 Second way is the front-end analog recording (Figure 2), intermediate digital transmission to reduce the signal loss during transmission, post-production situation as their own digital or analog form. SDI-2000 Series
Optical Fiber transmission in all the component video (Y-PB-PR, Y-CB-CR, YUV, Y / RY / BY) and two-channel audio; no regulator for the pure digital processing and transmission; audio input output can be requested by the user themselves configured as balanced or unbalanced, in this way, you can ensure the video / audio signal quality, to achieve good results. Its composition is: (1) to obtain the signal source, (venues) to determine the production of television signals to analog devices (analog broadcast vehicles) main; (2) signal transmission to digital transmission optical fiber transmission-based (optical digital transmission end machines), other secondary (emphasis added broadcast satellite transmission); (3) television news center system, through the
Matrix Assigned to transmit routing signals sent to various radio and television news centers, offering services to a variety of functions. Because this way to avoid loss of image signal transmission, can maintain high image quality, and do not replace existing analog devices, appealing to the small television.
News News technology systems should be all-digital program. Video / audio input signal from the transmission system to broadcast the signal all of the main signal for the SDI (embedded audio) or video / audio signals embedded by the solution or A / D conversion, assigned to the video area, video / audio distribution matrix and
Hard disk Network System. The signal switching and scheduling management, from the information center of the digital and analog video matrix matrix is responsible, then according to different requirements, you can directly SDI signal transmission to the transmitter or by
MPEG -2 Compression insert the following sub-
SDH Ring transfer to the provincial units.
Transmission equipment Optical transmission equipment to SDI-based, according to the actual transmission of digitally to choose video / audio Optical. Platform for digital signal transmission through the SDI, and analog signals to synchronize front row as the benchmark different, it is a serial data stream clock cycle as the base is synchronized with the clock PLL lock. In this way, as long as the receiver can lock the input signal, you can restore the signal. For the low frequency jitter, the amplitude is large, still will not affect the separation of data; with increased frequency jitter, receiver jitter values allowed smaller, the received signal will lose lock. If you restore the data using a non-jitter clock, as long as the jitter receiver detection circuit does not exceed the threshold value range, even in the "eyes" in the case of small open heterozygosity may also improve the regenerated data. Moreover, because do not need to send synchronization information can be in the video line, field blanking zone transfer large amounts of data information, such as EAV and SAV synchronization words, EDH and TRS so. Now widely used method is: according to time division multiplexing principle, the digital audio signal by way of multiplexing multiple serial digital video signals into the line blanking area. This not only saves the audio channel to simplify the system to connect and channel structure, but also to ensure the complete video and audio synchronization, elimination of delay effects.
Embedded in the solution side, SDI digital video signals (including embedded audio) serial data stream of auxiliary data, place the embedded audio, its benefits are: In addition to using a
Cable Transfer video / audio network can be simplified, but also to solve the lip problem. First, in the video input board solution containing the video data stream, processed into the compression plate, remove the spatial redundancy through motion estimation, code removal of temporal redundancy, the final sample used to remove redundant Variable Length Coding degree of encoded MPEG-2 Video Elementary Stream format, packaged by the packaging device video PES stream. Similarly, in the video input board solution containing the audio data stream into the audio encoding module, processed, compressed by MPEG-1LayerII format encoded audio Elementary Stream, and then the packaged device packaged into audio PES streams. Package of video / audio PES stream in the transport stream
Multiplexer Riga air bag and insert and reuse the program clock reference information into 34Mb/sG.703 multiplexing transmission stream (TS). 34Mb / s transmission code flows through the
Encoder The G.703 interface output to the SDH ring network.
Microwave transmission Production center Microwave Station studio transmitter, transmission system design and installation of a direct impact on the signal transmission quality. Most of the current transmission system equipment, digital products.
Microwave stations to make signal transmission between the centers of high
Broadband
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