CN100369474C - Automatic switching method for signal source channel of video frequency display equipment - Google Patents
Automatic switching method for signal source channel of video frequency display equipment Download PDFInfo
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- CN100369474C CN100369474C CNB200510104654XA CN200510104654A CN100369474C CN 100369474 C CN100369474 C CN 100369474C CN B200510104654X A CNB200510104654X A CN B200510104654XA CN 200510104654 A CN200510104654 A CN 200510104654A CN 100369474 C CN100369474 C CN 100369474C
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Abstract
The present invention relates to an automatic switching method for a signal source channel of a video displaying device, which comprises a video input circuit of the video display device, a control pin of CPU, control pins for automatic identification and a switch, wherein a video signal monitoring circuit is added at the control pin to separate synchronous video signals to control CPU; the control pins for automatic identification are provided with program modules which define audio-video channels according to the number of audio-video channels and are defined as AVn one to one according to controlling pipe pins provided by CPU; the switch can be automatically switched under the condition of a user menu, the switch can be automatically switched when the switch is in a switching-on state, the channel can be automatically switched according to the program, etc. The present invention provides a simple automatic switching method for the signal source channel of a user, and the device can automatically switched according to the on-off state of a signal source; thereby, the trouble of manual operation is eliminated. Furthermore, the user can control the device in a manual mode which is a traditional mode. Thus, the method of the present invention can be widely used for various video displaying devices (such as televisions, LCD, PDP, etc.).
Description
Technical field
The invention belongs to the video display technology field, more particularly relate to of the design of video display apparatus such as television set, display according to the channel automatic switching method of signal source on off state.
Background technology
Traditional television set and other video display apparatus (comprising LCD, PDP etc.) are manufacturing and designing and user when using, selection to various information source can only be operated by this machine button or the remote controller of complete machine, and this is the most general way in the present field of video displaying.
The shortcoming of aforesaid operations is: when signal source (DVD, set-top box etc.) changed, video display apparatus can not automatically switch thereupon, must switch to corresponding channel by manual operation.Quite trouble does not have hommization.
Summary of the invention
Purpose of the present invention just is to overcome above-mentioned shortcoming and defect, and a kind of automatic switching method for signal source channel of video display apparatus is provided.It can be the user an easier conversion information source method is provided, and makes display device automatically switch to corresponding channel according to the on off state of signal source (DVD, set-top box etc.), thereby exempts manually operated trouble.Simultaneously, the user still can effectively control by manual mode, has hommization.
In order to achieve the above object, the present invention includes the video input circuit of video display apparatus and the control pin Connection Step of CPU, further comprising the steps of:
(1) between the control pin of video input circuit and CPU, increases the vision signal observation circuit, be used for Controlled CPU;
(2) design one program module embeds in the software systems of complete machine, quantity definition audio frequency and video passage according to the audio frequency and video passage, as be defined as AV1, AV2......AVn etc., and the control pin that can provide according to CPU, be defined as the automatic identification control pin of AVn correspondingly, the control pin that can provide as CPU is less than the quantity of audio frequency and video passage, then selects important relatively channel to control automatically;
(3) under custom menu, the control switch of automatic switching function is set, also can be provided with respectively at every path channels, have only this switch to place under the situation of " opening ", automatic switching function is just effective;
(4) realize the automatic switchover of complete machine signal source channel according to program.
Described step (4) comprises following substep:
No matter 1. what channel complete machine just is being operated in, with the AVn incoming video signal, CPU control corresponding pin has high level or synchronizing signal to insert, and the procedure auto-control complete machine switches to the AVn channel, store former channel number simultaneously in register, complete machine returned to former channel when the AVn signal turn-offed;
2. automatically switched to the AVn channel as complete machine, this moment the AVm incoming video signal, then CPU control corresponding pin has high level or synchronizing signal access, the procedure auto-control complete machine switches to the AVm channel, store the AVn channel number simultaneously, turn-off earlier as the AVm signal this moment, and then complete machine enters the AVn channel, turn-off earlier as the AVn signal, then from register, remove the AVn channel number;
As long as 3. use a teleswitch or this machine button channel has been carried out change or complete machine be set enter holding state, then complete machine enters the channel of user's control, or enters holding state, does not store the channel number of automatic switchover in the register;
4. result in blockage for preventing that the above signal of two-way from importing simultaneously, in program, stipulate the priority level of each path channels;
5. AVn incoming video signal under holding state, CPU control corresponding pin has high level or synchronizing signal inserts, start of procedure auto-control complete machine and switching enter the AVn channel, when external signal all disconnects, then complete machine returns holding state automatically, as use a teleswitch or this machine button is changed channel, then complete machine returns holding state no longer automatically;
6. power cutoff switch, the channel number or the holding state of former acquiescence or user's control are remembered, and the state of the control of automaticallying switch will not be stored.
M, n in the All Files of the present invention are positive integer, are the channel numbers that defines for convenience of explanation.
Described step (1) but in when CPU Direct Recognition vision signal, the input of vision signal by coupling capacitance every directly, carry out the control pin that impedance matching is divided to CPU by resistance again, then by judging the operating function that realizes software that has or not of vision signal.
In the described step (1) when CPU can not the Direct Recognition vision signal, after vision signal is handled by synchronizing separator circuit, the video synchronization signal of output certain amplitude, this synchronizing signal is connected to the control pin of CPU as control input signals, and CPU is by judging the operating function that realizes software that has or not of synchronizing signal.
In the described step (1) when CPU only can discern high-low level, need to increase synchronizing separator circuit and dc voltage control circuit, synchronizing signal is converted to the control signal of galvanic current pressure as the CPU control pin, CPU realizes the operating function of software by the high-low level of judging input pin.
The present invention increases the vision signal observation circuit on video input circuit, situation according to CPU, or directly use vision signal or isolate synchronizing signal or synchronizing signal further is converted into DC level, be used for certain pin of Controlled CPU, and realize automatic conversion and other necessary function of signal source channel by software.
The course of work of the present invention is as follows:
Under complete machine was in normal operating conditions, when the control pin of CPU monitors vision signal input (video signal source that is connected with this pin is as connection work such as DVD, set-top box), video display apparatus was transformed into this channel automatically, shows the signal of this channel.Turn-off video signal source in the case as the user, video display apparatus then returns the channel before switching automatically.Under the automatic switchover state, the information source options button of remote controller, this machine button still has control.
Be under the holding state (STAND-BY MODE) at complete machine, when the control pin of CPU monitors the vision signal input, with Auto Power On and be converted into corresponding channel.Under this state, as signal source (as set-top box etc.) shutdown, video display apparatus then returns holding state automatically.Under at open state, use this machine button or remote controller to switch (or switching) channel, then holding state cancellation, during signal source shutdown (or signal cuts off because of other reason), this machine no longer automatically returns to holding state.
The options of this function is set in the display menu of complete machine, and the user can activate or shield this function according to the personal inclination.
Under situation with the input of multi-information source terminal, can select topmost one tunnel information source to control automatically, also can realize control operation one to one by the quantity that increases control circuit.Will adopt stack register to carry out state storage this moment aspect software, by after go into preferential mode and effectively control.At hardware aspect, be the influence of avoiding identification circuit to cause signal, need carry out rational impedance matching to video input circuit, under the strict situation of semaphore request, can additionally increase the amplifying circuit of standard.
The present invention makes complete machine automatically switch to corresponding channel according to the on off state of signal source (DVD, set-top box etc.), thereby exempts manually operated trouble for the user provides an easier conversion information source method.Simultaneously, the user still can effectively control by manual mode, has hommization.It can be widely used in the various video display apparatus (as television set, LCD, PDP etc.).
Description of drawings
Fig. 1 is a software control flow chart of the present invention.
Fig. 2 is the video Input Monitor Connector circuit theory diagrams of embodiment 2.
Fig. 3 is the video Input Monitor Connector circuit theory diagrams of embodiment 3.
Embodiment
Embodiment 1.A kind of automatic switching method for signal source channel of video display apparatus, as shown in Figure 1.It may further comprise the steps:
(1) but the powerful Direct Recognition vision signal of cpu function, vision signal from the input of signal by coupling capacitance every directly, carry out the control pin that impedance matching is divided to CPU by resistance again, be used for realizing the control of CPU;
(2) design one program module embeds in the software systems of complete machine, quantity definition audio frequency and video passage according to the audio frequency and video passage, as be defined as AV1, AV2......AVn etc., and the control pin that can provide according to CPU, be defined as the automatic identification control pin of AVn correspondingly, the control pin that can provide as CPU is less than the quantity of audio frequency and video passage, then selects important relatively channel to control automatically;
(3) under custom menu, the control switch of automatic switching function is set, also can be provided with respectively at every path channels, have only this switch to place under the situation of " opening ", automatic switching function is just effective;
(4) realize the automatic switchover of complete machine signal source channel according to program.
Described step (4) comprises following substep:
No matter 1. what channel complete machine just is being operated in, with the AVn incoming video signal, CPU control corresponding pin has vision signal to insert, and the procedure auto-control complete machine switches to the AVn channel, stores former channel number simultaneously in register, and complete machine returned to former channel when the AVn signal turn-offed;
2. automatically switched to the AVn channel as complete machine, this moment the AVm incoming video signal, then CPU control corresponding pin has the vision signal access, the procedure auto-control complete machine switches to the AVm channel, store the AVn channel number simultaneously, turn-off earlier as the AVm signal this moment, and then complete machine enters the AVn channel, turn-off earlier as the AVn signal, then from register, remove the AVn channel number;
As long as 3. use a teleswitch or this machine button channel has been carried out change or complete machine be set enter holding state, then complete machine enters the channel of user's control, or enters holding state, does not store the channel number of automatic switchover in the register;
4. result in blockage for preventing that the above signal of two-way from importing simultaneously, in program, stipulate the priority level of each path channels;
5. AVn incoming video signal under holding state, CPU control corresponding pin has vision signal and inserts, the start of procedure auto-control complete machine also enters the AVn channel, when external signal all disconnects, then complete machine returns holding state automatically, as use a teleswitch or this machine button is changed channel, then complete machine returns holding state no longer automatically;
6. power cutoff switch, the channel number of former acquiescence or user's control and holding state (needing the user to set) wait to be remembered, and the state of controlling that automaticallyes switch will not be stored.
Program of the present invention is used the C language compilation, and program module will embed in the whole software system of complete machine simultaneously.At first will be according to the quantity of hardware audio frequency and video passage, definition audio frequency and video passage is as being defined as AV1, AV2, YUV or the like respectively.Its less important control pin that can provide according to CPU is defined as the automatic identification control pin of AVn correspondingly.The control pin that can provide as CPU is less than the quantity of AV passage, can select important relatively AV passage to control automatically.
Consider that under some situation, the user does not need the AV automatic switching function, therefore will be under custom menu (MENU), the control switch of automatic switching function is set, also can be provided with respectively at every path channels, have only this switch to place under the situation of " opening ", automatic switching function is just effective.
The various states of possibility various case and the required operation of complete machine are programmed in will using according to the user at last, control respectively:
1. situation 1, normal operating conditions (no matter what channel complete machine just is being operated in), and the AVn incoming video signal, then CPU control corresponding pin has the vision signal access.In view of the above, the procedure auto-control complete machine enters the AVn channel, stores former channel number simultaneously in register, and complete machine can return to former channel when turn-offing in order to the AVn signal.
2. situation 2, and complete machine has automatically switched to the AVn channel.At this moment, the AVm incoming video signal, then CPU control corresponding pin has the vision signal access.In view of the above, procedure auto-control enters the AVm channel, stores the AVn channel number simultaneously.Turn-off earlier as the AVm signal, then complete machine enters the AVn channel, turn-offs earlier as the AVn signal, then removes the AVn channel number from register.
3. situation 3, no matter under situation 1 or situation 2 states, as long as use a teleswitch or this switch is changed channel, or complete machine is set enters holding state, then complete machine enters the channel of user's control, or enters holding state, does not store the channel number of automatic switchover in the status register.At this moment, turn-off connection again or another road signal connection as the AVn signal, operation is as situation 1 or situation 5.
4. situation 4, result in blockage for preventing that the above signal of two-way from importing simultaneously, stipulate the priority level of each path channels in program.
5. situation 5, and complete machine is in holding state (STAND-BY MODE), the AVn incoming video signal, and then CPU control corresponding pin has the vision signal access, and in view of the above, the start of procedure auto-control complete machine also enters the AVn channel.All the other operations are with situation 1, situation 2.Simultaneously, when external signal all disconnects, will return holding state automatically.As use a teleswitch or this machine button is changed channel, then return holding state no longer automatically.
6. situation 6, the switching off AC power switch, and the channel number of former acquiescence or user's control and holding state (needing the user to set) etc. are remembered, and the state of the control of automaticallying switch is not stored.
Embodiment 2.A kind of automatic switching method for signal source channel of video display apparatus is as Fig. 1～shown in Figure 2.Between the control pin of video input circuit and CPU, increase the vision signal observation circuit,
In the described step (1) when CPU can not the Direct Recognition vision signal, vision signal SIGNAL carries out impedance matching by coupling capacitance C1 every straight, resistance R 1, after handling by synchronizing separator circuit (forming) again by triode V1 and peripheral components thereof, the video synchronization signal of output certain amplitude.The amplitude of synchronizing signal must reach certain level, and this mainly contains two reasons: the one, and the effectively action of Controlled CPU, the 2nd, can avoid clutter interference to cause misoperation.This synchronizing signal is connected to the control pin of CPU as control input signals, and CPU is by judging the operating function that realizes software that has or not of synchronizing signal.
That is to say, can not the Direct Recognition vision signal time, just need to increase synchronizing separator circuit as the CPU of video display apparatus.After vision signal is handled by synchronizing separator circuit, the video synchronization signal of output certain amplitude, this synchronizing signal is connected to the control pin of CPU as control input signals, and CPU is by judging the operating function that realizes software that has or not of synchronizing signal then.Its circuit as shown in Figure 2.
All the other steps are with embodiment 1.
Embodiment 3.A kind of automatic switching method for signal source channel of video display apparatus is as Fig. 1, shown in Figure 3.
When CPU only can discern high-low level, need to increase synchronizing separator circuit and dc voltage control circuit, synchronizing signal is converted to the control signal of galvanic current pressure as the CPU control pin in the described step (1).The same with embodiment 2 requirements, this DC level must reach certain amplitude, and CPU realizes the operating function of software by the high-low level of judging input pin.
That is to say, only can discern high-low level, that is only can come Controlled CPU the time, need to increase synchronizing separator circuit and dc voltage control circuit by the height that galvanic current is pressed as the CPU of video display apparatus.In such cases, just synchronizing signal need be converted to the control signal of galvanic current pressure as the CPU control pin.Vision signal SIGNAL after straight, resistance R 1 are carried out impedance matching, synchronizing separator circuit (V1 and peripheral components thereof) processing, exports the direct voltage of certain amplitude by coupling capacitance C1 again by the dc voltage control circuit that is made of VD1, V2, V3 etc.When vision signal was imported, output voltage was that supply voltage is a high level, was low level otherwise input voltage is 0V.CPU realizes the operating function of software by the high-low level of judging input pin.Its circuit as shown in Figure 3.
All the other steps are with embodiment 1.
Embodiment 1～3 makes complete machine automatically switch to corresponding channel according to the on off state of signal source (DVD, set-top box etc.), thereby exempts manually operated trouble for the user provides an easier conversion information source method.Simultaneously, the user still can have hommization by manually being that traditional mode is effectively controlled.It can be widely used in the various video display apparatus (as television set, LCD, PDP etc.).
Claims (5)
1. the automatic switching method for signal source channel of a video display apparatus comprises the video input circuit of video display apparatus and the control pin Connection Step of CPU, it is characterized in that further comprising the steps of:
(1) between the control pin of video input circuit and CPU, increases the vision signal observation circuit, isolate the synchronizing signal of video, be used for the control pin of Controlled CPU;
(2) design one program module embeds in the software systems of complete machine, quantity definition audio frequency and video passage according to the audio frequency and video passage, be defined as AV1, AV2......AVn, and the control pin that can provide according to CPU, be defined as the automatic identification control pin of AVn channel correspondingly, the control pin that can provide as CPU is less than the quantity of audio frequency and video passage, then selects important relatively channel to control automatically;
(3) under custom menu, the control switch of automatic switching function is set, be provided with respectively at every path channels, have only this switch to place under the situation of " opening ", automatic switching function is just effective;
(4) realize the automatic switchover of complete machine signal source channel according to program.
2. according to the automatic switching method for signal source channel of the described video display apparatus of claim 1, it is characterized in that said step (4) comprises following substep:
No matter 1. what channel complete machine just is being operated in, with the AVn incoming video signal, CPU control corresponding pin has high level or synchronizing signal to insert, and the procedure auto-control complete machine switches to the AVn channel, store former channel number simultaneously in register, complete machine returned to former channel when the AVn signal turn-offed;
2. automatically switched to the AVn channel as complete machine, this moment the AVm incoming video signal, then CPU control corresponding pin has high level or synchronizing signal access, the procedure auto-control complete machine switches to the AVm channel, store the AVn channel number simultaneously, turn-off earlier as the AVm signal this moment, and then complete machine enters the AVn channel, turn-off earlier as the AVn signal, then from register, remove the AVn channel number;
As long as 3. use a teleswitch or this machine button channel has been carried out change or complete machine be set enter holding state, then complete machine enters the channel of user's control, or enters holding state, does not store the channel number of automatic switchover in the register;
4. result in blockage for preventing that the above signal of two-way from importing simultaneously, in program, stipulate the priority level of each path channels;
5. AVn incoming video signal under holding state, CPU control corresponding pin has high level or synchronizing signal inserts, start of procedure auto-control complete machine and switching enter the AVn channel, when external signal all disconnects, then complete machine returns holding state automatically, as use a teleswitch or this machine button is changed channel, then complete machine returns holding state no longer automatically;
6. power cutoff switch, the channel number of former acquiescence or user's control and the holding state that the user is provided with are remembered, and the state of the control of automaticallying switch will not be stored.
3. according to the automatic switching method for signal source channel of claim 1 or 2 described video display apparatus, it is characterized in that described step (1) but in when CPU Direct Recognition vision signal, the input of vision signal by coupling capacitance every directly, carry out the control pin that impedance matching is divided to CPU by resistance again, then by judging the operating function that realizes software that has or not of vision signal.
4. according to the automatic switching method for signal source channel of claim 1 or 2 described video display apparatus, it is characterized in that in the described step (1) when CPU can not the Direct Recognition vision signal, after vision signal is handled by synchronizing separator circuit, the video synchronization signal of output certain amplitude, this synchronizing signal is connected to the control pin of CPU as control input signals, and CPU is by judging the operating function that realizes software that has or not of synchronizing signal.
5. according to the automatic switching method for signal source channel of claim 1 or 2 described video display apparatus, CPU it is characterized in that in the described step (1) when only can discern high-low level, need to increase synchronizing separator circuit and dc voltage control circuit, synchronizing signal is converted to the control signal of galvanic current pressure as the CPU control pin, CPU realizes the operating function of software by the high-low level of judging input pin.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102095570B (en) * | 2010-11-25 | 2012-09-05 | 中国地质大学（武汉） | Automatic channel switching device for PDP (plasma display panel) vacuum ultraviolet fluorescent powder testing system |
| CN205249374U (en) * | 2015-12-15 | 2016-05-18 | 乐视致新电子科技（天津）有限公司 | Television signal source automatic switching control equipment |
| CN106254921A (en) * | 2016-08-05 | 2016-12-21 | 青岛海信宽带多媒体技术有限公司 | Signal transmission control unit |
| CN107333180B (en) * | 2017-06-28 | 2020-07-21 | 深圳Tcl新技术有限公司 | Information source switching method of television, television and computer readable storage medium |
| CN107621798B (en) * | 2017-09-30 | 2020-02-21 | 昆明联诚科技股份有限公司 | Traffic area controller display control method based on one-key occupation technology |
| CN112449222B (en) * | 2019-09-03 | 2023-05-02 | 深圳Tcl数字技术有限公司 | Signal source control method, system, display terminal and storage medium |
| CN113094005B (en) * | 2019-12-23 | 2024-04-09 | 普源精电科技股份有限公司 | Method, system, computer equipment and medium for controlling synchronous output of signal sources |
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| CN1218597A (en) * | 1996-03-15 | 1999-06-02 | E盖德公司 | Combination of VCR index and EPG |
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: HISENSE Co.,Ltd. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE Co.,Ltd. Patentee before: HISENSE ELECTRIC Co.,Ltd. |