1. What is digital network broadcasting?
Answer: As the name implies, digital network broadcasting is a broadcasting system that digitizes broadcasting signals (A / D conversion) and transmits them on Ethernet (TCP / IP) or the Internet (Internet). After the analog audio signals are collected, quantized, and encoded Broadcast method for transmission on the network according to the network protocol.
2. What is the principle of digital network broadcasting and how reliable is it?
Answer: Digital network broadcasting is to collect the compressed digital audio files (such as MP3) or digital audio files stored in the memory in real time according to a certain algorithm, and transmit the audio files to the network broadcast in the form of data packets through the network according to the transmission protocol. At the receiving end, the D / A conversion is performed through the network broadcasting terminal, and then the audio signal is restored, and the speaker is driven to work after being amplified. Each network broadcast terminal is an embedded computer with audio codec and network communication functions, and has its own independent IP address. Like PC networking in a local area network, it communicates according to the TCP / IP protocol.
3. What are the components of digital network broadcasting? Network audio broadcasting is structurally speaking, a master computer (audio server), a set of broadcast software or server software, sends audio files to remote network terminals in the form of IP streams Each terminal should have a fixed IP address and network module, a professional digital audio decoding device (software or hardware), and power amplifier control unit.
4. What is the sound quality of digital network broadcasting, will there be delay?
Answer: The digital network broadcast adopts the MP3 audio compression format, with a sampling frequency of 44.1KHz and a high-quality audio compression format of 16Bit, and adopts a pure digital transmission method, which will not cause noise accumulation during the production, processing and transmission process, which will Decreasing the noise ratio leads to signal degradation.
In theory, digital network broadcasting has a long transmission delay, and transmission-buffering-decoding takes a certain amount of time. However, in actual transmission, as long as the network downlink bandwidth is 128K, a stereo audio signal can be transmitted very smoothly. The time can be controlled within 0.3 to 0.5 seconds, which has no effect from the perspective of use.
5. What are the technical advantages of digital network broadcasting compared with traditional broadcasting?
Answer: Digital network broadcasting is a completely digital broadcasting system in the true sense. It uses the digital format for the production, storage and transmission of program sources. Traditional broadcasting (constant pressure broadcasting, FM broadcasting) is generally only digitalized during recording and broadcasting, but analog signals are still used in the transmission process, so the sound quality of digital broadcasting should be better than traditional broadcasting.
6. How many broadcast signals can be transmitted by digital network broadcasting at the same time?
Answer: Because it is purely digital signal transmission, digital network broadcasting is not limited by the number of programs. It can broadcast different programs for each network broadcast terminal. In actual use, it transmits dozens or even hundreds of signals simultaneously. No problem, fully meet the requirements of conventional broadcasting.
7. What is the wiring structure of digital network broadcasting and how far can it be transmitted?
Answer: The digital network broadcasting is designed according to the technical standards of the most common Ethernet transmission architecture. As long as there is a network interface, a network broadcasting terminal can be installed without special wiring, whether it is fiber optic, Cat5e cable, digital microwave or Wireless bridges can transmit network audio broadcasts as long as the network is connected.
7. Can digital network broadcasting realize AOD on demand?
Answer: Yes, because the network broadcast itself works under the TCP / IP protocol based on two-way communication. The two-way broadcast terminal of Stellar Ketong and the network power amplifier with on-demand function can query the server for remote on-demand or scheduled playback through the remote control.
8. Can digital network broadcasting realize two-way intercom function?
Answer: Yes, as mentioned above, the network broadcast is a two-way communication. The stellar Ketong HX network broadcast terminal has built-in microphone and voice acquisition and transmission module, which can fully realize the intercom function with the broadcast center.
9. Should the digital network broadcast be transmitted on the wide area network (Internet)?
Answer: Yes, each terminal of the digital network broadcast has its own fixed independent IP and server to communicate, but in the wide area network, the telecommunications operator assigns each user a dynamic IP, so that the network broadcast terminal on the wide area network Unable to communicate directly with the server, Stellar Cocom uses IP parsing technology, and a VNN server can be set up specifically as a relay in communication, that is to say, when the network broadcast terminal and broadcast server work on the Internet, they are first Access the VNN server, and report its IP address and ID to the VNN server, and then the VNN server directs the IP of each terminal to the broadcast server to establish two-way communication to complete the network broadcast on the wide area network.
11. Can digital network broadcasting achieve live broadcasting?
Answer: Yes, the network broadcast can be collected, quantized, and encoded in real time through the LINEIN port of the sound card, and the real-time broadcast can be fully realized.
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