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Technical characteristics and advantages of TSC embedded Network Rail Transit Broadcasting system
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1. System overview:
Embedded broadcast system is a special subsystem in subway communication system. It plays an important role in subway transportation organization, passenger transport service, disaster prevention, rescue, and equipment maintenance, etc. It can improve the quality of subway passenger service and the ability to deal with emergencies.
2. System composition:
The broadcasting subsystem is set up in the mode of central level and station level to satisfy the managers at all levels to broadcast the broadcast area.
The central broadcasting equipment includes the audio microphone used in the integrated monitoring system, the central backup broadcasting console, the central broadcasting cabinet (including host, audio expander, power amplifier box, etc.), the system network management terminal, connect cables between loudspeakers and broadcast equipment, etc.
Station level broadcasting subsystem equipment includes audio microphone used in station integrated monitoring system console, station backup broadcasting console, broadcasting cabinet (including main engine, fire alarm unit, audio expander, power amplifier box, etc.), noise sensor, Loudspeakers, cables, etc.
3.Transcend solution’s specialty
1.Embedded computer technology is adopted in the broadcast equipments
Broadcasting system used embedded hardware and software technology, each device is composed of embedded CPU and open OS (similar to the smart phone we used in our daily life), and been “cut out” to optimize the application of the rail industry broadcast, and all the hardware and software that have nothing to do with the broadcast will be "cut off" in order to improve the stability of the system. Each device has a strong computing capacity, according to the different external conditions, they can start the corresponding audio playback properties.
(General manufacturers use "Intel motherboard Windows" design, poor stability, vulnerable to virus infection.)
2. The Transcend broadcast system adopts the network system architecture
The broadcast system adopts network transmission technology (whether audio or control management), standard TCP/IP protocol is used between devices, so the system is easy to expand, which means that the station line of subway / high-speed railway line can become very convenient to expand. (Most of the traditional broadcast systems adopt the communication mode of RS232 or RS485, their amount of data is small, their distance of transmission is limited, and their space of intelligent application is not large).
3. DSP Audio processing Technology
The broadcast equipment adopts professional DSP audio coding and decoding technology, and many audio processing techniques are built in the chip, such as preamplifier, parameter equalization, analog-to-digital coding and digital-analog decoding, etc. The processing capacity of one chip is equivalent to traditional manufacturers 4-5 audio equipment, so it can greatly reduce the cost and reduce the equipment failure rate.
4. ALL-IN-ONE--Integrated structural design
The broadcast equipment is designed in a highly integrated way-- A station requires only 5 units of this devices to realize all intelligent broadcasting functions, unlike other traditional broadcasting systems, more than 20 devices, such as multiple microphones, are required in a single station. Preamplifier, matrix divider, listening equipment, audio matrix, strong power supply, strong cut relay, recording equipment, source storage device, timing power supply, fixed voltage power amplifier, etc. The failure rate is high.
5. Support multiple user interface protocols
The broadcast equipment provides two communication modes. The new station can adopt TCP/IP protocol directly, and the old station can adopt RS422 protocol (or RS485U RS232).
6. Modular Class D Power Amplifier Box
All the class D amplifier power amplifier and high power amplifier module, support electrothermal plug, power failure automatic backup, maintenance personnel to replace power, it will not affect the normal broadcast station. Each power amplifier module maximum output pressure 500W audio power amplifier, the conversion efficiency is as high as 93%, far higher than the traditional manufacturer (class AB amplifier) 50% the conversion efficiency of the power amplifier module; plug box, convenient maintenance and overhaul of power station maintenance personnel; in addition, the network decoder amplifier, built-in speaker line detection function, and the pilot tone on line fault (short circuit, open circuit and grounding) were detected and compared with other general resistance detection manufacturers also, more accurate.
7. Network master function
The station level broadcasting system adopts the main and backup network redundancy design broadcast host, two links work at the same time, when the main network has the communication failure, the backup network communication data is enabled automatically.
8. Digital noise detection technology
The noise detector can realize the equipment that can accurately measure the environmental noise while broadcasting at the station. We adopt the FFT algorithm, we can only extract the noise part from the audio signal collected in the field, and realize the function of automatically controlling the volume according to the noise.
4. Main products:
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Broadcast host
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1. Kernel: embedded system, dual CPU main Frequency 400MHz, additional dual SD Card 8G, High Speed DSP Audio processor
2. Functional features: 8 sets of digital music programs can be downloaded and edited on the remote network, including 8 call prompts and 8 call prompts for 2 × 16 time period timing programs, and 9999 digital music programs), etc.
3. Audio input: 2, microphone and line, distortion less than 0.2, SNR greater than 70 dB, this program has plugging function, sensitivity -60-30dB / -20dB, sampling frequency 44.1KHz
4. Line output: 2, unbalanced, distortion less than 0.2, SNR greater than 90dB, frequency response 20kHz, output level: 0-6dB
5. Control input: 4, passive contact input / no / NC programmable settings
6. Control output: 4, passive relays (withstanding 3A 30V DC / 220V AC / NOP / NC programmable settings)
7. Network / bus: two 10 / 100m RJ45 ports / RS485
8. Display: 2 LED operating status lights and 1 power indicator lamp
9. Environmental conditions: temperature -5 ℃55 ℃, relative humidity 1590%, anti-interference satisfied EN55103-2, proved by CE/CCC
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