CN101047775A

CN101047775A - IPTV top-set box of implementing seamless switchover watching analog TV.

Info

Publication number: CN101047775A
Application number: CNA2007100400150A
Authority: CN
Inventors: 颜昌林; 肖雄
Original assignee: DAYA SCIENCE AND TECHNOLOGY Co Ltd SHANGHAI
Current assignee: DAYA SCIENCE AND TECHNOLOGY Co Ltd SHANGHAI
Priority date: 2007-04-26
Filing date: 2007-04-26
Publication date: 2007-10-03

Abstract

This invention relates to an IPTV set-top box realizing seamless switch for watching analog TV, in which, the hardware system is composed of an anolog radio-frequency head, a RJ45 network interface, a D/A converter, a MAC controller and a PHY, a main system chip, a FLSH storage, a DDR storage and an audio/ video output port, and the main chip exchanges data with the RJ 45 network interface by the MAC controller and PHY to realize the ordinary function of IPTV set-top box, one end of the analog radio-frequency head is connected with an analog wire TV socket, the output of which is converted into digital signals by audio/video A/D to be input into the main chip, which carries out video process to the digital signal then to be output on a TV display terminal via the audio/video output port to realize seamless switch of analog TV since network input, local storage and analog TV input are output via the audio/video output port.

Description

The IPTV set-top box of simulated television seamless switching is watched in realization

Technical field

The invention belongs to television set auxiliary equipment technical field, be specifically related to a kind of TV signal source of need not switching and directly see common wired analog television program, the IPTV set-top box of the seamless combination of realization and Web TV.

Background technology

Generally, the IPTV set-top box can only be watched Web TV, or Web TV adds digital cable TV.Domestic and most of undeveloped country Digital Television is not very universal at present, and simulated television also occupies quite great proportion.On existing IPTV set-top box, want to see that analog catv need switch the complex operation complexity to the television signal input.The present invention is integrated in the simulation tuner in the IPTV set-top box, and by software control, the user can the direct control set-top box realize wired simulated television and Web TV seamless switching, has simplified user's operation greatly.

Summary of the invention

The object of the present invention is to provide a kind of wired simulated television and Web TV seamless switching, easy to operate IPTV set-top box of realizing.

IPTV set-top-box system framework proposed by the invention as shown in Figure 1.

Hardware construction system of the present invention by: the simulation tuner 1, RJ45 network interface 2, audio-video converter 3, mac controller and PHY4, system's master chip 5, FLSH memory 6, compositions such as DDR memory 7 and audio frequency and video output port 8.

Wherein master chip 5 carries out exchanges data by mac controller and PHY4 and RJ45 network interface, realizes common IPTV set-top box functionality; Simulation tuner 1 (TV-TUNER) termination analog catv signal plug, output is converted to digital signal by audio frequency and video A/D (analog to digital converter) 3, input master chip 5; 5 pairs of digital signals of master chip are carried out audio frequency and video and are handled, and output to by audio frequency and video output port 8 (Audio/Video out) then on the display terminal such as television set.Because of network input, local storage and simulated television input etc. all are through Audio/Video out output, watch the simulated television function so can reach seamless switching.

Common IPTV set-top box need directly link to each other television set with the cable TV signal line, as shown in Figure 2 if see analog catv.Except that other cable, also need a line Cable 2 who links to each other with cable TV signal.Television set back plug wire is many more, and the bad probability of cable contact also increases.Because of the television set volume is bigger, above cable go wrong and will go to adjust, be comparison difficulty trouble.Also need in the time of need seeing simulated television television signal is switched and uses the TV remote controller channel selection, the user operates loaded down with trivial details.

IPTV set-top box of the present invention is provided with and television set 9, RF10 and network interface 11 direct-connected interfaces.Use IPTV set-top box of the present invention will see simulated television, connect as shown in Figure 3.Need not cable between television set and analog catv signal and link to each other, cable TV is as long as be connected with the IPTV set-top box, if contact badly, can plug the cable on the machine IPTV top box very easily again.Because of cable TV signal is as IPTV set-top box input signal source,, simplified user's operation greatly so can directly use the IPTV set-top box to carry out the seamless switching of analog television program and network TV program etc.In actual application, after simulated television platform signal can being searched for automatically, do TV station's numbered list in this locality; Can also simulated television electronic program guide (EPG) (Electronic Program Guide) be sent by head end with operator's cooperation, real-time update makes things convenient for user's channel selection and watches program.

Description of drawings

Fig. 1: the present invention watches the IPTV set-top-box system block diagram of simulated television seamless switching.

Fig. 2: conventional IPTV set-top box and TV are seen simulated television line diagram.

Fig. 3: use IPTV set-top box of the present invention to see the line diagram of simulated television.

Fig. 4: the simulation tuner links with the audio frequency and video A/D converter.

Fig. 5: tuner peripheral circuit schematic diagram.

Fig. 6: IPTV set-top-box system software flow of the present invention.

Number in the figure: 1 is that simulation tuner 2 is that RJ45 network interface 3 is that mac controller and PHY 5 are that FLSH memory 7 is that television set 10 is that network interface 12 is audio A/D transducer for IPTV set-top box 31 for video a/d converter 32 for analog catv signal (RF) 11 for DDR memory 8 for audio frequency and video output port 9 for master chip 6 for audio-video converter 4.

Embodiment

Below further specifically describe the IPTV set-top box that realizes that seamless switching is watched simulated television.

One, chooses IPTV scheme master chip, each circuit unit schematic diagram of needs is finished.Simulation tuner 1 is connected with master chip 5 by A/D converter 3, and simulation tuner 1 is connected as shown in Figure 4 with A/D converter 3:

(1) output of simulation tuner 1 analog video adds resistance with video a/d converter 31 intermediate demands and carries out impedance matching.

(2) output of simulation tuner 1 analogue audio frequency and audio A/32 need of D transducer add electric capacity C, remove DC component.

(3) simulation tuner 1 may not have special pin output ground connection, need be the pin ground connection of playing fixation on the metal shell.

Two, the peripheral circuit of simulation tuner 1 is as shown in Figure 5:

(1) VCC3 is to different circuit supplies with VCC2 on the simulation tuner, preferably with magnetic bead or inductance the two-way isolated from power, as L1A among Fig. 5.

(2) resistance R 2A, R3A can remove or uses different value instead according to different high frequencies.

(3) simulation tuner 1 earthing of casing (not drawing among the figure).

Three, software is realized, the software flow of native system such as Fig. 6.

(1) control of simulation tuner and TV station's numbering.

Master chip 5 is by I2C (Inter-Integrated Circuit) bus gated sweep tuner.Realize the automatic channel search function of simulated television: the low-limit frequency that the simulation tuner can receive is set, increase progressively with fixing bandwidth and to scan the input of RF signal, when TV station's signal occurs, note this frequency, when all energy receive frequencies have been scanned, just can obtain a frequency meter that TV station is arranged.This frequency meter is deposited among the EEPROM (Electrically Erasable Programmable Read-Only Memory), before doing automatic channel search next time, with the corresponding platform of each frequency and add numbering.When the user enters the cable TV pattern, can directly import numbering from remote-controled digital, corresponding TV station accesses automatically.

(2) EPG realizes.

When the IPTV set-top box specifically is applied to somewhere, can cooperate with local operator, local cable TV EPG is sent on the IPTV set-top box by network.After set-top box receives EPG information, can change platform under the simulated television pattern seeing at every turn, the EPG of corresponding channel is shown several seconds on screen.Also can on remote controller, do an information button, under seeing the simulated television pattern, during by this key, in progress channel EPG is shown on the screen.

Claims

1. the IPTV set-top box that the simulated television seamless switching is watched in realization is characterized in that being made up of simulation tuner (1), RJ45 network interface (2), audio-video converter (3), mac controller and PHY (4), system's master chip (5), FLSH memory (6), DDR memory (7) and audio frequency and video output port (8); Wherein master chip (5) carries out exchanges data by mac controller and PHY (4) with RJ45 network interface (2), realizes common IPTV set-top box functionality; Simulation tuner (1) one termination analog catv signal plug, output is converted to digital signal by audio-video converter (3), input master chip (5); Master chip (5) carries out audio frequency and video to digital signal to be handled, and outputs on the display terminal by audio frequency and video output port (8) then.

2. IPTV set-top box according to claim 1 is characterized in that described IPTV set-top box is provided with and television set (9), analog catv signal (10), the direct-connected interface of network interface (11).

3. IPTV set-top box according to claim 1 is characterized in that

(1) output of simulation tuner (1) analog video is added with resistance with video a/d converter (31) is middle, carries out impedance matching;

(2) output of simulation tuner (1) analogue audio frequency and audio A/D transducer are added with capacitor C between (32), are used to remove DC component;

(3) the pin ground connection of playing fixation on simulation tuner (1) metal shell.