CCTV site control builds payable Channel HD encoding compression system, using AVS+ coding mode of our country's independent innovation to complete coding and compression of high definition signals. The system mainly includes the encoder, the multiplexer and so on, when input signal fault or equipment failure, it can realize the automatic switchover by unified system control management. The important characteristics of the system are as follows:
One: Device and connection management mode in compression system
Each system is configured with a high definition AVS+ encoder, which can realize the coding and compression of the main signal in the system. The encoder outputs a TS/IP signal and is connected with the multiplexer through a data exchange, and the switch is a Gigabit Ethernet interface. All the main encoders are connected with the main data exchange, and the standby encoder is connected with the standby data exchange.
Side view of the device of system configuration is to see the decoder, the device can decode and view scrambling (NDS) and none scrambled AVS+ coded stream which is the output of the system.
Two: System redundancy protection mechanism
When the input signal fail or the main encoder fault, the encoder without a valid output, at the same time, multiplexer can distinguish input stream lost, thus under the control of unified network management of compression system, in the multiplexer level achieve corresponding program switching prepared by the main stream. At the same time, the encoder can report the fault status to the unified network management of compression system through the SNMP and other common protocols.
Three: Code stream monitoring system
The system contains the loop monitoring decoder of the AVS+ decoding and DVB-S QPSK demodulation and AVS+ open monitoring receiver of DVB-S2/8PSK demodulation, with the daily broadcast of compressed signals to receive monitoring. At the same time, both the decoder and the receiver can be carried out with the scrambling flow (NDS).