Bi-directional digital TV video on demand realizing device with PON (Passive Optical Network) and IPQAM (Internet Protocol Quadrature Amplitude Modulator) structure

A technology for digital TV and radio and television, applied in the field of two-way digital TV on-demand implementation devices, can solve the problems of wasting analog bandwidth and occupying coaxial cable frequency bandwidth resources, etc., and achieves the effect of less investment equipment and low cost

Inactive Publication Date: 2011-05-11
顾海涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved: the existing IPQAM products, placed in the central computer room or the front-end computer roo

Method used

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  • Bi-directional digital TV video on demand realizing device with PON (Passive Optical Network) and IPQAM (Internet Protocol Quadrature Amplitude Modulator) structure
  • Bi-directional digital TV video on demand realizing device with PON (Passive Optical Network) and IPQAM (Internet Protocol Quadrature Amplitude Modulator) structure
  • Bi-directional digital TV video on demand realizing device with PON (Passive Optical Network) and IPQAM (Internet Protocol Quadrature Amplitude Modulator) structure

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] Preferred Example 1: System Networking

[0038] This application example is a block diagram of the entire system, such as figure 1 As shown, 101 is the radio and television central computer room, 102 is the radio and television front-end computer room, 103 is the HFC optical fiber network, 104 is the HFC optical station, 105 is the ONU of EPON or GPON, 106 is the IPQAM equipment, and 108 is the coaxial cable network in the HFC network ; 107 is a set-top box terminal user; 109 is a set-top box terminal user;

[0039] 101 is the computer room of the radio and television center, which has a broadcast control system; the broadcast control system includes: (1) audio and video program source storage system, (2) on-demand control equipment, (3) live TV signal; connected together by the broadcast control equipment, Realize live TV and two-way TV on demand; the central computer room has another line connected to the Internet, and the Internet in the central computer room of the...

example 2

[0051] System expansion implementation plan:

[0052] Solution 1: With the increase of the number of users under IPQAM, when the bandwidth resources are insufficient, the IPQAM equipment is moved down to realize the space reuse of frequency resources, so as to make full use of its frequency resources.

[0053] Solution 2: As the number of users under IPQAM increases, when the bandwidth resources are insufficient, add an IPQAM device and set it at a different frequency point, so as to realize the multiplexing of IPQAM devices; when the frequency resources are insufficient, use the first solution , move the IPQAM device down. This can completely solve the problem of insufficient coaxial cable frequency resources.

example 3

[0054] Preferred Example 3: The Realization Method of IPQAM and HFC Optical Station Space Separation

[0055] In the coaxial cable of the HFC cable TV network with DOCSIS system, the optical station is used as the return signal of DOCSIS for the signal of 5-65MHz, and the downlink signal of 87MHz-862MHz is used for broadcasting and TV.

[0056] Since the radio and television network HFC is a tree-shaped or star-shaped coaxial cable network, an optical splitter is used in the optical fiber part to realize the distribution of broadcast and TV signals in a star-shaped network, and the IPQAM equipment can be moved down to achieve spatial multiplexing, so that the same frequency can be used in different Down application of coaxial cable.

[0057] Such as figure 2 As shown, 201 is the broadcast control center, 202 is the optical splitter of the broadcast control center, 203 is the optical amplifier, 204 is the front-end optical splitter, 205 is the optical amplifier, 206 is the op...

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Abstract

The invention relates to a Bi-directional digital TV video on demand realizing device with a PON (Passive Optical Network) and IPQAM (Internet Protocol Quadrature Amplitude Modulator) structure, in particular to a device which realizes space division multiplexing by extending the PON and downwards moving the IPQAM. The traditional IPQAM product arranged in a centre machine room or front machine room occupies more frequency bandwidth resources of a coaxial cable to cause a great waste of analog bandwidth. The IPQAM is moved from the centre machine room or the front machine room to a cell or light station, thereby multiplexing the frequency bandwidth resources of the coaxial cable and completely solving the problem of insufficient frequency resources of a coaxial cable network. With the technical scheme, space division multiplexing can be realized by downwards moving IPQAM equipment, the frequency utilization ratio of an HFC (Hybrid Fiber and Coax) network is greatly increased, and an optimal video transmission scheme is provided for the integration of three networks. The Bi-directional digital TV video on demand realizing device can be widely applied to occasions such as video on-demand, bi-direction interactive TV and the like.

Description

1. Technical field [0001] The patent of the present invention relates to a two-way digital TV-on-demand realization device with PON and IPQAM structure, in particular to a device for realizing space division multiplexing by using PON to extend IPQAM and shift down. 2. Background technology [0002] In the prior art, the IPQAM equipment is placed in the central computer room or the front-end computer room, which occupies a large amount of analog bandwidth of the coaxial cable. 3. Contents of the invention [0003] The problem to be solved: the existing IPQAM products, placed in the central computer room or the front-end computer room, will occupy a considerable frequency bandwidth resource of the coaxial cable, resulting in a lot of waste of analog bandwidth. [0004] Technical solutions: such as figure 1 As shown, 101 is the radio and television central computer room, 102 is the radio and television front-end computer room, 103 is the HFC optical fiber network, 104 is the...

Claims

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Application Information

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IPC IPC(8): H04N21/238H04N21/239H04N7/10H04Q11/00H04L12/28H04H20/04
Inventor 顾海涛
Owner 顾海涛
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