On The Use Of Voip In The Transmission Of Technical Description-voip, Packet Switching,

Abstract: The so-called VoIP network based on IP packet switching platform for the

transmission of analog voice signal is compressed, packaged and a series of special treatment, so that you can not connect using UDP protocol for transport.

So-called VoIP network based on IP packet switching platform for the transmission of analog voice signal is compressed, packaged and a series of special treatment, so that you can not connect using UDP protocol for transport.

Voice communication via the Internet is a very complex system engineering, its application area is very wide and therefore the technology involved particularly large, the most fundamental technology is VoIP (VoiceoverIP) technology, can be said that Internet telephony is VoIP technology, one of the most typical and the most promising fields of application. In this paper, the basic transmission VOIP.

Traditional circuit-switched telephone network by way of voice, the required transmission bandwidth to 64kbit / s. The so-called VoIP based IP packet switched network transmission platform, the analog voice signal is compressed, packaged and so a series of special treatment, so no connection can be used to transmit UDP protocols.

An IP network to transmit voice signals require several elements and functions. The simplest form of network consists of two or more VoIP-enabled device with the composition of the device through an IP network connection. VoIP devices may be found in how the voice signal is converted to IP data flow, and to the data flow sent to the IP destination, IP destination, they are converted back to voice signal again. Both the tone of the network must support IP transmission and IP router and can be any combination of network links. VoIP so you can simply transfer process is divided into the following stages.

1, Voice - Data Conversion Analog voice signal is the waveform, by means of IP voice, whether business or non-real time applications real-time application business, Daomao shore first analog voice signal data conversion, that is, the analog voice signal to 8-bit or 6 quantified, and then sent to the buffer storage areas, the buffer size can be encoded according to the requirements of delay and choice. Many low bit rate encoder is taken to encode the frame as a unit. Typical frame length is 10 ~ 30ms. To consider the cost of the transmission process, inter-language package usually 60,120 or 240ms the voice data component. Can use a variety of digital voice encoding scheme to achieve the current speech coding standards used mainly ITU-TG.711. The source and destination of the voice encoder to achieve the same algorithm, this destination can help restore the analog voice devices Voice signal.

2, the original data to the IP conversion

Once the voice signal to digital code, the next step is on the voice packets to a specific frame size for compression. Most of the encoder has a specific frame length, if the encoder uses a 15ms frame, put the past from the first 60ms of the package is divided into four, according to the order of coding. Each frame of 120 speech samples combined (sampling rate of 8kHz). Encoded, compressed to 4 frames into one compressed voice packets into the network processor. Add a header for the voice network processor, after the time scale and other information transmitted through the network to another endpoint. Voice network simply to establish the physical connection between the communication endpoints (one line), and encoded signals transmitted between endpoints. Unlike circuit-switched network IP network, it does not form a connection, it requires the data on the variable-length packet or packet, and then attached to each packet addressing and control information, and sent over the network, a station a station to transmit to the destination.

3, transmission

In this channel, all network is seen as a voice packet received from the input side, and then in a certain time (t) will be sent to the network of its output. t be in a whole range of changes, reflecting the network transmission jitter. Network with the data between the nodes check each IP address with the information and use this information to forward the datagram to the destination path on the next stop.

by: gaga

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