Channel damage testing method of radio and television transmission distribution network
A technology of broadcasting and testing methods, applied in the field of information, can solve the problems of inaccurate TS stream delay damage, etc., and achieve the effect of improving accuracy
Active Publication Date: 2014-05-14
ACADEMY OF BROADCASTING SCI STATE ADMINISTATION OF PRESS PUBLICATION RADIO FILM & TELEVISION
View PDF6 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The present invention provides a channel damage testing method for radio and television transmission and distribution network, which is used to solve the technical problem in the prior art that the delay damage of TS stream in the transmission and distribution network is inaccurately tested by using a code stream analyzer
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0013] figure 1 It is a flow chart of an embodiment of the channel impairment testing method of the broadcast television transmission and distribution network provided by the present invention. like figure 1 As shown, the method specifically includes:
[0014] S101, add an input timestamp to the first field position of each TS packet of the transmission code TS stream to be tested, and send the TS packet with the input timestamp added to the radio and television transmission and distribution network to be tested; the input timestamp is sent The corresponding local time when the TS packet arrives at the radio and television transmission and distribution network to be tested;
[0015] The present embodiment adopts 27MHz, and the length is the clock of 4 bytes (each clock cycle occupies four bytes) counting represents local time T local .
[0016] Specifically, when calculating the input time stamp T corresponding to sending TS packets to the radio and television transmission...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a channel damage testing method of a radio and television transmission distribution network. According to the channel damage testing method of the radio and television transmission distribution network provided by the invention, an input timestamp adds to a first field position of each TS packet in a to-be-tested transmission code TS flow, and the TS packet with the input timestamp is sent to a to-be-tested radio and television transmission distribution network; the TS packet with the input timestamp is received from an output terminal of the radio and television transmission distribution network; after an output timestamp adds to a second field position of the TS packet, the TS packet is stored in a cache; and a timestamp difference between an input timestamp and an output timestamp which are included in each TS packet stored in the cache is identified as a delay damage of the TS packet in the to-be-tested radio and television transmission distribution network channel. The embodiment of the invention can effectively improve the delay damage accuracy of the testing TS flow in the transmission distribution network.
Description
technical field [0001] The invention relates to information technology, in particular to a channel damage testing method of a radio and television transmission and distribution network. Background technique [0002] At present, the method for testing the channel damage of the existing broadcasting and television transmission and distribution network is to measure and evaluate the transmission quality of the Transmit Stream (TS) stream transmitted in the transmission and distribution network through a bit stream analyzer. The delay and jitter of the TS stream during transmission are tested by monitoring the key field of the Program Clock Reference (PCR) in the TS stream. [0003] PCR can be regarded as an internal time to ensure that encoders and decoders in the transmission distribution network are synchronized in time. The internal time in the encoder can use a 27MHz oscillator as the input of the system clock (System Time Clock, STC). STC is a 42bit counter, counted by a...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/26H04L29/06H04N17/00
Inventor 李培琳白鹤崔竞飞万倩张国庭赵明
Owner ACADEMY OF BROADCASTING SCI STATE ADMINISTATION OF PRESS PUBLICATION RADIO FILM & TELEVISION