Unlock instant, AI-driven research and patent intelligence for your innovation.

Serial generator of pre-biased cable digital TV checksum

A cable digital TV and production device technology, applied in the direction of digital transmission system, electrical components, cable transmission adaptation, etc., can solve the problem of excessive resource consumption, and achieve the effect of reducing hardware cost and logic resource requirements.

Active Publication Date: 2022-01-07
COMMUNICATION UNIVERSITY OF CHINA
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantage of high resource consumption in the J.83B standard checksum generation scheme, the present invention provides a pre-biased checksum serial generation device, which can effectively reduce resource requirements

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Serial generator of pre-biased cable digital TV checksum
  • Serial generator of pre-biased cable digital TV checksum
  • Serial generator of pre-biased cable digital TV checksum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0019] The following introduces a highly efficient J.83B checksum generation device in the manner of moving from simple to complex first, and then from complex to simple.

[0020] Depend on figure 1 The functional block diagram of the checksum generation device given by the J.83B standard can be drawn, such as figure 2 shown. image 3 It is a functional block diagram of a checksum generation device that does not multiplex an I-type divider and an I-type multiplier. exist figure 2 In , the output of the I-type divider is sent to two branches, which is equivalent to sending the output of two I-type dividers with the same input into two branches respectively, such as image 3 shown. exist figure 2 , switch S 2 It forms a cascade circuit with the I-type multiplier, and the modulo 2 additio...

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

No PUM Login to View More

Abstract

The invention relates to a serial generation scheme of a pre-biased cable digital TV checksum, which is suitable for the digital multi-program system B recommended by ITU-T J.83, referred to as J.83B, and is characterized in that the checksum And the serial generating device is mainly composed of an improved divider, an improved multiplier, a switch S 1 and two-input XOR gate M 8 It consists of four parts. The checksum serial generating device provided by the invention can effectively reduce the logic resource requirement while keeping the processing speed constant, and has the advantages of less resource consumption, low cost and the like.

Description

technical field [0001] The invention relates to the field of cable digital television, in particular to the checksum technology of the North American cable digital television standard J.83B. Background technique [0002] The digital multi-program system B (referred to as J.83B) recommended by ITU-T J.83 is the cable digital TV standard in North America. The MPEG-2 transport packet adopts a fixed length of 188 bytes, and is composed of a sync of 1 byte, a header of 3 bytes, and data of 184 bytes. The sync field is the hexadecimal number 0x47. The MPEG-2 data stream is transmitted serially, with the most significant bit (Most Significant Bit, MSB) being transmitted first in each byte, and the least significant bit (Least Significant Bit, LSB) being transmitted last. [0003] ITU-T J.83 recommends four kinds of digital multi-program systems, which are abbreviated as J.83A, J.83B, J.83C and J.83D respectively. The J.83B standard removes the synchronization field 0x47 of the M...

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
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04N7/10
CPCH04L1/0061H04N7/10
Inventor 张鹏刘昌银陈远知杜建和
Owner COMMUNICATION UNIVERSITY OF CHINA