CN1652567A

CN1652567A - Method for selecting video apparatus signals

Info

Publication number: CN1652567A
Application number: CN 200510020271
Authority: CN
Inventors: 余杰; 邓新群; 朱晓东
Original assignee: Sichuan Changhong Electric Co Ltd
Current assignee: Sichuan Changhong Electric Co Ltd
Priority date: 2005-01-28
Filing date: 2005-01-28
Publication date: 2005-08-10
Anticipated expiration: 2025-01-28
Also published as: CN100342714C

Abstract

The method includes following steps: (1) when turning TV set on, the method tests each signal channel; (2) based on priority list setup in advance, the method determines image signal to be displayed after turning on TV set. Comparing with prior art, the disclosed method meets requires of different users, provides an easy way to select video signal so as to raise market competition force of product.

Description

Method for selecting video apparatus signals

Technical field

The present invention relates to electronic technology, particularly video equipment such as television set.

Background technology

Along with the continuous progress of electronic technology, TV particularly rear-projection TV can receive and the video signal displayed type more and more abundanter, as various video signals such as AV, S-VIDEO, YPbPr, PC, DVI, SCART.

From the existing market operating position, in different occasions, the function port of rear-projection TV has different application: 1, most of domestic consumer uses rear-projection to watch the TV programme of each TV station, watch vision signal (signal types such as AV, SVIDEO, YPbPr), wherein to watch TV from VCD, DVD; 2, in the public place of entertainment as the OK Room, be mainly used to play the AV signal of outputs such as external equipment such as VCD, DVD, amusement PC, the TV receiving function is almost useless; 3, departments such as administrative organs, enterprises and institutions, educational system, rear-projection mainly is used as the display terminal of PC; 4 and in the family in future, rear-projection is mainly as the reception and the display terminal of HDTV (High-Definition Television) signal.

Nearly all television receiver all is that start is defaulted as the TV state at present, if switch under other display modes, need repeatedly to select to want display mode by teleswitch, be not easy to user's operation, adopt rear-projection as its display platform as certain airport, use the AV input pattern signal, be used for the display machines field information, every day, the staff need be with remote controller before rear-projection machine to be opened, and by remote controller or this machine button the picture display mode was switched to the AV state then; For another example, school is a display terminal as PC with rear-projection basically, and the teacher at first will couple together PC and rear-projection by the VGA line, open PC and rear-projection then, rear-projection is normal start after, needing that also signal mode is switched to the PC pattern can normally show.

Present more employing be to detect by the mode that increases identification circuit whether to have ancillary equipment to insert, then signalling channel is switched to corresponding display mode, yet do two shortcomings like this: 1, the extra GPIO pin of the CPU that need take is used for signal identification; 2, because the method is to judge by the difference of high-low level whether signal source exists, when ancillary equipment inserts, CPU may detect the access of peripheral hardware, but self can not determine whether peripheral hardware has the signal of signal output, output whether normal, can rear-projection TV normally receive this moment, and only can be as the foundation of determining whether peripheral hardware exists.Many producers have also adopted the mode of software mnemonics to handle this type of problem, be that what pattern shutdown was after this used, then next time start just shows any pattern, because numerous consumer groups have only a kind of signal source, still can not solve the problem in the application since so at all.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of method for selecting video apparatus signals, to solve the problem that prior art exists, so that the client uses.

The technical scheme that the present invention solve the technical problem employing is, a kind of method for selecting video apparatus signals is provided, and may further comprise the steps: detect each signalling channel during a. start; B. according to default priority list, determine the picture signal that play the start back.

Among the described step b,,, play the signal of other signalling channels then according to priority list if priority signalling channel no signal formerly imports or signal can not normally show; If each passage does not have any signal input, perhaps Shu Ru signal all can not normally show or handle, and then gives tacit consent to the PC pattern as power on mode, display screen protection picture, and continue each signalling channel of scanning.Described video equipment is a television set, comprises rear-projection TV, LCD TV, plasm TV, CRT TV or other multimedia display terminals.Described signalling channel comprises any at least two kinds in AV, S-Video, TV, YPbPr, PC, DVI, the SCART signal.

The invention has the beneficial effects as follows, adopt the video product of the technology of the present invention to satisfy dissimilar requirement of client, improved the competitiveness of product in market.

The present invention is further illustrated below in conjunction with specification drawings and specific embodiments.

Description of drawings

Fig. 1 is a flow chart of the present invention.

Fig. 2 is an embodiment of the invention block diagram.

Embodiment

The present invention is at application such as Fig. 1 that start detects, power on and initialization after, system detects each signalling channel successively according to priority list, what priority was the highest is first signalling channel, next be the secondary signal passage, other are by that analogy.When detecting a certain signalling channel there be signal when input that can handle, promptly lock this signalling channel, the shows signal with this channel signal during as start.For example, priority list is as follows:

1 TV

2 AV

3 S-Video

4 YpbPr

5 PC

During start, system at first scans the TV passage as first priority, if the TV channel signal can be handled, then locks the TV signal, with the signal of TV signal as the start broadcast.If scanning discovery TV signal is unavailable, then scan AV passage as second priority, if the available AV signal that then locks, with the signal of AV signal as the start broadcast; If scanning discovery AV signal is unavailable, then scanning is positioned at the S-Video signal of the 3rd priority, by that analogy, and up to the minimum PC signal of scan priority.If all signal is all unavailable, display screen guard signal after start then, described screen protection signal can be static pattern, also can be movable animation etc.

As an embodiment more specifically, be example with the rear-projection TV, referring to Fig. 2.Rear-projection has multiple external signal receiving function terminals such as TV, AV, S-Video, YPbPr, PC, DVI, SCART.Strong functions interface like this, the general user only can use a wherein part; Simultaneously rear-projection TV needs 8～12S from starting power supply to normal demonstration, and CPU is in idle condition the most of the time therebetween, and during start, system handles as follows:

1, powers on system initialization;

2, operational system start-up routine;

3, by predefined procedure each signalling channel is carried out synchronization signal detection.Wherein TV, AV signal are isolated line synchronizing signal Hs by synchronizing separator circuit and are sent into CPU, carry out frequency counting by CPU, and identification is handled; S-VIDEO, YPbPr, PC signal are sent to CPU by the I2C bus with information by frequency counting and synchronous processing device identification back, call corresponding processing program by CPU and handle; The signal of DVI interface input then directly by the digital frequency conversion processor to discerning through the digital signal behind the DVI signal processor, by parallel bus information is sent to CPU then, call corresponding program by CPU and handle.

(1) when detecting a certain signalling channel there be signal when input that can handle, promptly lock this signalling channel, show this channel signal during start;

(2) when the code book machine of no any signal input or input can not be handled and show; system default PC pattern is as power on mode, and display screen is protected picture simultaneously, and continues each signal port of scanning on the backstage; when no proper signal was imported in one hour, system shut down automatically.

(3) when multiple signal inserted simultaneously, system determined start-up picture according to priority.

In addition, in normal procedure for displaying, when input signal disappears; system display screen protection picture; and continue each signal port of scanning on the backstage according to each step of the present invention, if when still not having the external signal input in a default time, system just enters power save mode.The rear-projection normal operation period still can carry out the switching of this machine display mode by the external control source.

Claims

1, method for selecting video apparatus signals is characterized in that, may further comprise the steps:

A. when start or the normal signal interruption that shows, detect each signalling channel;

B. according to default priority list, determine the picture signal that play the start back.

2, method for selecting video apparatus signals as claimed in claim 1 is characterized in that, among the described step b,

If priority input of signalling channel no signal or signal formerly can not normally show,, play the signal of other signalling channels then according to priority list;

If each passage does not have any signal input, perhaps Shu Ru signal all can not normally show or handle, then display screen protection picture.

3, method for selecting video apparatus signals as claimed in claim 2 is characterized in that, among the described step b; if each passage does not have any signal input; perhaps Shu Ru signal all can not normally show or handle, each signalling channel of then display screen protection picture, and continuation scanning.

4, method for selecting video apparatus signals as claimed in claim 2; it is characterized in that; among the described step b; if each passage does not have any signal input; perhaps Shu Ru signal all can not normally show or handle; then give tacit consent to the PC pattern as power on mode, display screen protection picture, and continue each signalling channel of scanning.

As the described method for selecting video apparatus signals of above arbitrary claim, it is characterized in that 5, described video equipment is a television set.

6, method for selecting video apparatus signals as claimed in claim 5 is characterized in that, described television set is rear-projection TV, LCD TV, plasm TV or CRT TV.

7, method for selecting video apparatus signals as claimed in claim 5 is characterized in that, described signalling channel comprises any at least two kinds in TV, AV, S-Video, YPbPr, PC, DVI, the SCART signal.