CN1286871A - Program signal blocking system - Google Patents
Program signal blocking system Download PDFInfo
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- CN1286871A CN1286871A CN 97182524 CN97182524A CN1286871A CN 1286871 A CN1286871 A CN 1286871A CN 97182524 CN97182524 CN 97182524 CN 97182524 A CN97182524 A CN 97182524A CN 1286871 A CN1286871 A CN 1286871A
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Abstract
An apparatus and a method for preventing a user from bypassing a viewer blocking system using program related information, such as content ratings, included in a program signal. The present invention prevents the user from exploiting the time delay associated with detecting, decoding and comparing the program related information by switching channels to observe portions of objectionable program before the blocking system can react. The present system comprises a processor which controls the output of a selected program signal (VIDEO, VIDEO IN, AUDIO IN) in response to a determination of whether an associated program related information meets a user selected blocking criberial. The processor blocks display of a program signal when a predetermined sequence of signal channel selections is detected and then continues to block the display of the program signal at least until the determination is performed. The predetermined sequence of signal channel selections may comprise continual re-tuning of the same channel and/or switching between two channels. The present method comprises detecting a particular sequence of signal channel selections and blocking the display of the program signal upon detecting the predetermined sequence. If the predetermined sequence of signal channel selections is detected the display blocking is maintained at least until a program related information associ
Description
The present invention relates to handle and the output programme signal, for example the system of TV or program signal relates in particular to the system that handles and export programme signal according to the included supplementary of programme signal.
Except the video and/or audio program part of concrete TV or broadcast program, programme signal can comprise supplementary.This program and supplementary can comprise simulation and/or digital signal.An analog signal, NTSC standard television signal for example, the horizontal line interim in vertical blanking interval (VBI) can comprise auxiliary data.For example, the closed caption data are included in field 1 row 21 of this VBI, and extended data services (XDS) information is included in field 2 row 21 of VBI.In digital system, this vision signal normally sends by the packet of data character code or data set.Each packet comprises identification information, and represents for example information of video, audio frequency or supplementary particular type.An example handling the digital television system of packing digital television signal is DSS (digital satellite system) receiver, is made by Thomson Consumer Electronics Inc. of the Indianapolis of Indiana State.
Technology that the application of supplementary relates to so-called " V-chip ", it allows the user automatically to block to fall bad data from its television receiver.In using the system of this technology, the program-related information that comprises with this programme signal provides the consultation information about each program.This program consultation information may be taked the several forms including, but not limited to program classification, and this classification points out spectators' age of recommending and/or point out representing and/or grade of bad data, and for example the property in the program represents, violence, language or the like.For example, the program grade system of a suggestion is described in the EIA-744 standard of proposing, title is " using the transmission of the content consultation information of extended data services (XDS) ".
The obstruction standard that this V-chip technology contrast user selects, for example the mensuration of a selection is blocked the grade investigation program consultation information relevant with each selected programme signal, if and the information of this program consulting satisfies the obstruction standard that this user selects, then block to fall this programme signal.For example, if this obstruction grade is arranged on " PG ", then have " PG " and more high-grade, for example the program of " R ", " NC-17 " and " X " grade will get clogged.Programme signal blocked be meant by for example the image blackening or distinguish and can not read, make VM and forbid showing that associated closure title program stops the access of user to a bad program.When the program consultation information was represented no longer to receive this bad data, this V-chip system was by showing this image, stop quiet this sound accompaniment and/or realizing that the program of associated closure title shows to come this program channel of unblocking.
A difficulty relevant with above-mentioned V-chip technology is for receiving the decode program-related information needed time of delay for a television receiver.Because program-related information is the information that sends on image, audio frequency and out of Memory property intercycle ground, so may experience the delay of television receiver receiving the decode new program-related information when the user selects a new channel before.For example, the ANSI/EIA-608A technical specification of the transmission that is used for XDS program grade packet of suggestion thinks, except that the packet of closed caption data delay, the program grade packet should be with the certain hour that was not more than for the 3 seconds repetition of being separated by.The selection of closed caption high priority data power is by legal requiremnt.Therefore if 2 title, then the program grade transmitted in packets is can retardation ratio longer 3 seconds.Therefore, when the user selected a new channel, television receiver can use the relevant information of several detections in seconds and this new program of decoding, and selects suitable blocking function.This delay is an obvious periodic, might allow bad program remain on not blocked state therebetween, and can be watched by the spectators that do not expect.
The user can attempt utilizing above-mentioned delay, and by repeatedly be tuned to specific channel so that blocking some part that a bad program was watched or listened to feature before can starting.For example, this user can constantly reselect same channel or constantly switch so that watch or listen some significant part of a bad program between two or more channels.
What therefore, need is one and stops the user that use is included in the system that the obstruction feature of a system of the program-related information in the programme signal is carried out bypass.Specifically, what need is a such system, and it stops the user to utilize with the delay of detection, decoding and check program-related information this is blocked the bypass of feature.
The present invention is by providing one to stop the user to utilize the system of above-mentioned time-delay to overcome above-mentioned difficulty.The present invention be particularly suitable for using can be tuned to one of a plurality of signal channels and providing in the signal output apparatus of image and/or audio signal output.This device comprises (but being not limited to) television receiver, digital satellite receiver, VCR, video disc playback machine and audio signal receiver.
System of the present invention comprises a signal processor, it provides an output signal relevant with the programme signal of signals selected channel, and the control user responds one and whether satisfies determining of obstruction standard that the user selects and insert this programme signal being included in program-related information in this programme signal.User-selected obstruction standard can be taked many forms, include, but are not limited to a concrete grade and block standard, if wherein the program-related information of Jie Shouing equals or exceeds this user-selected grade obstruction standard, this system will stop the user to insert this output signal.Program-related information may include, but are not limited to spectators' character classification by age, programme content classification, program title and the digest portions programs of suggestion.When activating a suitable blocking model, if one new signal channel is selected and a predetermined sequence signal selection is detected, then this processor is automatically controlled with this with a predetermined way and is reselected the relevant output signal of channel, pair reselect the access of the relevant program of channel so that prevent the user, and determining up to this processor whether this obstruction standard satisfies this and continue this control before reselecting channel at least with this.Preferably, this signal processor is at least in the control that is determined and is continued before relatively by the obstruction standard of selecting with user this output signal up to this program-related information.
This output signal is controlled in a predetermined mode, so that stop the user that this is selected the access of programme signal.It should be understood that, this control mode comprises any processing and the modification to this programme signal, make the some parts of this program or this program in vision and/or acoustically can not be understood, include, but are not limited to interrupt this signal path, utilize that an obstruction level substitutes normal programme signal, a screen display (OSD) the signal scrambling output signal that shows with the active information of representing this obstruction feature and/or change this output signal by this user.This control method for example advantageously causes: to video section blanking, quiet and forbid the closed caption relevant with this program to the sound accompaniment part.
The predetermined sequence of this channel selection can comprise reselecting of reselecting of previous selection channel and/or two or more channels.System of the present invention can be designed such that mode that above-mentioned prevention user inserts only has at the channel of reselecting and just occur when satisfying the previous detection program-related information that this user selects to block standard.When a predefined procedure of signal channel selection is detected, by automatically controlling this output signal in the above described manner, the present invention stops user access for bad data during the time of delay of determining to be performed detected when this program-related information and that whether this obstruction standard is satisfied.
System of the present invention may be designed such that also this obstruction feature is only just come into force when the user selects a suitable blocking model.
System of the present invention can also be designed such that the given number of the predefined procedure that has only the signal selection just starts this obstruction feature when appearing on the special time period.
The present invention is described with reference to the accompanying drawings, therein:
Fig. 1 is a block diagram of realizing a television system of the principle of the invention;
Fig. 2 is a flow chart, is illustrated in the step that is used to change a channel in the television system, and it does not provide at the protection of attempting a program-related information of bypass based on choke system; And
Fig. 3-the 4th, flow chart is illustrated in the step that is used to change a channel in the television system, and it is according to the invention provides at the protection of attempting a program-related information of bypass based on choke system.
Exemplary television receiver system 10 shown in Fig. 1 comprises input 100, from for example antenna or cable line received RF (RF) TV signal, and this TV signal is added to tuner parts 105.105 responses of tuner parts come the control signal selection and an amplification concrete RF signal relevant with selected television channel of self-controller 110.Use therein term " controller ", " processor controls ", " microprocessor " (being μ P) and " microcomputer " (being μ C) are equivalent, are meant can or can not occur and device that can executive control operation with the form of integrated circuit (IC).
As shown in Figure 1, controller 110 comprises CPU (CPU) 112, the ROM 114 and the RAM 116 that operate through bus 111 interconnection, in typical microcomputer mode, for example the ST9 integrated circuit of being made by SGS The Thomson Corporation (IC).CPU 112 produces control signal, and response is stored in the software instruction among ROM 114 and the EEPROM 127 and responds the output that the user who receives by keyboard 120 and/or infrared (IR) receiver 122 provides instruction code controlling system 10.The instruction code that controller 110 receives from IR remote control 125 through IR receiver 122.
The control signal that is produced by controller 110 is provided to other parts of system 10, for example is provided to tuner 105 through a control bus of being represented by label CTRL_BUS among Fig. 1.A typical embodiments of the control bus shown in Fig. 1 comprises that mutual integrated circuit (IIC or the I2C) bus protocol that (but being not limited to) supported with Philips is two-wire serial bus of benchmark.
IR remote control 125 and/or keyboard 120 allow the user to select a specific obstruction standard, are used for automatically blocking bad data.This obstruction standard can be taked many forms, comprises (but be not limited to) if a relevant program-related information is when for example programme labeling information equals or exceeds an information-setting by user or classification grade, then program blocking.Select an example of obstruction standard to be, response user designator character code or title in user's designator character code or be included in the detection of the program description in the program-related information, start and block.The obstruction standard that this is user-selected, as noted before can be a classification grade, be stored in the controller 110, and check by CPU 112, so as to resemble further describe below block or do not block a program.This user can make one's options by select specific blocking model and/or obstruction grade from on-screen display menus.
When the user selected a specific television channel by starting keyboard 120 or remote control 125, controller 110 produced a control signal on bus CTRL-BUS, make tuner 105 be tuned to the RF signal of selected channel.Tuner 105 outputs corresponding to an intermediate frequency (IF) signal of this tuning in to channels to IF processor 130.IF processor 130 comprises (but being not limited to) circuit, for example image I F (VIF) amplifying stage, AFT circuit, vision signal detector and sound accompaniment IF (SIF) amplifying stage, be used to handle this IF signal, produce baseband composite video signal VIDEO and audio carrier signal AUDIO.Audio signal processor 135 comprises a sound detector and stereodecoder, and processing signals AUDIO is so that produce the base-band audio signal that is suitable for driving loudspeaker unit 136.Baseband composite video signal 130 from IF processor 130 is added to video switcher 140.Another video signal VIDEO IN can be provided to system of the present invention by an outside source, for example is provided to system of the present invention by a VCR through signal input part 102.The external signal information source also can provide an audio signal AUDIO IN through signal input part 101.Controller 110 response users' signal source is selected each output of control of video switch 140 and audio process 135.It should be understood that to provide a plurality of external signal inputs adapting to a plurality of outside sources, and vision signal change over switch 140 and audio process 135 can revise on demand, so that allow the user to select a concrete outside source.
Select according to this user, 140 signal VIDE01s relevant with one of signal of importing of video switcher are provided to video signal preprocessor 155.Video signal preprocessor 155 is handled vision signal VIDE01, produces red, green and blue (R, G and B) output signal RGB, and it is suitable for being coupled to an image display device.Video signal preprocessor 155 is carried out and is handled, so that autochroma and brilliance control are provided especially, and realizes user's controlling features, for example contrast and brilliance control.
Be coupled to picture tube 158 so that before showing desired image, this rgb signal that is produced by video signal preprocessor 155 is amplified to suitable high voltage level by picture tube driving amplifier 156.Demonstration on the picture tube 158 is controlled respectively by the vertical and horizontal deflection signal VR and the HR of the deflecting coil that is coupled to picture tube 158.Deflection unit 170 is level of response and vertical synchronizing signal HS and VS respectively, promptly from the synchronized component of baseband signaling VIDEO output, produces signal HR and VR.Those parts in Fig. 1 described so far system are known, for example understand in the CTC-197 color TV base plate of making from Thomson Consumer Electronics Inc. (Indianapolis, Indiana State).
Also comprise assistance data processor 115 in the system shown in Fig. 1, be used for detecting and the various supplementarys of decoding, comprise program-related information, for example program classification and/or the content category message that comprises by a vision signal.And the closed caption decoding function can be included in the assistance data processor 115, and itself and screen display (OSD) processor 117 are coupled, so that closed caption information is inserted into the suitable part that video shows.Normally known from the extract data processor of supplementary of vision signal, and generally include data amplitude limiter, timing generator, controlling organization, decoder and a memory.One of any can use in this television system of some kinds of common known assistance data processor.For example, be suitable for disclosing in the United States Patent (USP) 5,561,469 of " utilizing the multi-mode peak detection to determine synchronously and the auxiliary video data amplitude limiter of data division level " from an extract system of supplementary of a vision signal.
Assistance data processor 115 detects and the decoding program-related information, for example be included in the program classification among the signal VIDE01, and this program-related information is provided to CPU 112.CPU 112 to be checked the program-related information of this detection and determines whether to satisfy a user-selected obstruction standard, for example by the program-related information of this detection and a user-selected obstruction grade relatively, and whether the program-related information of definite this detection equals or exceeds this user-selected obstruction grade and determines.
If the obstruction standard that this user selects satisfies, CPU 112 makes this program to insert by controlling this output signal with a predetermined way.Should be appreciated that this control mode comprises any processing and the modification to programme signal, and is as noted before, this processing and modification make the some parts of this program or this program be in vision to this user and/or acoustically can not understand.For example, controller 110 provides the output of control signal to forbid audio process 135, forbids the output of closed caption and utilizes a suitable osd signal to replace this normal programme signal, for example comprises a uniform Blue screen of indicating this obstruction feature activation information.If the program-related information that detects does not satisfy this user-selected obstruction standard, then CPU112 makes video signal preprocessor 155 and audio process 135 that the output signal relevant with this received signal is provided in a conventional manner.
Fig. 2 represents not dispose the flow chart of steps that stops the user to utilize a television system of above-mentioned delay.When the user began a channel change in step 200, television system was carried out a channel blanking step 202, at the channel of the tuning new selection of step 204, and no longer this TV demonstration of blanking in the step 206 then.That is, when tuning in to channels, the new channel of selecting is by temporarily blanking, but just no longer blanking immediately after tuner 105 is with relevant tuning this programme signal of new channel.
This new channel is by tuning and no longer after the blanking, and television system determines that in step 208 this V-chip channel blocks feature and whether is activated.If not, system withdraws from from this program in step 210.If this obstruction feature is activated, it is zero that this system is provided with a V-chip data bag timer, and begins to increase progressively this timer in step 212.This television system monitors the row 21 XDS data that are used for program-related information in step 214 then.
In case detect and the effective XDS program-related information bag of having decoded in step 216, this system then resets this V-chip data bag timer to zero, and increases progressively this timer in a predetermined mode in the beginning step 220.In step 222, system the obstruction grade of the new program-related information that detects and user's selection relatively determines whether this user-selected obstruction standard satisfies subsequently.If should the obstruction standard satisfy, promptly should the new program-related information that detects equal or exceed the obstruction grade that this user selects, then this system by aforesaid output signal control, blocks the access of user to this channel in step 226; And turn back to step 214 so that the detection of repeated program relevant information and comparison process, and block/no longer block this channel as required.If should the obstruction standard not satisfy, the promptly new program-related information that detects is the obstruction grade of selecting less than in the step 222, then this permission user of system inserts and the relevant program of new selection channel, and turns back to step 214, so that repeat supervision as noted above and block processing.
And, if this television system fails to detect a new program-related information in the phase scheduled time definite by increasing progressively of this V-chip data bag timer, then this television system will allow the user to insert this channel, the unblocking that promptly keeps this channel, and turn back to step 214, so that repeat processing as noted above.Therefore, television system constantly attempts detecting new program-related information, and whether the obstruction standard that definite user selects is satisfied, so that the control user is to receiving the access of programme signal.
But, can find out, the user in step 206 to the access of this channel early than the detection of new program-related information and when the user selects a new channel to determining that whether this obstruction standard satisfies.As above discuss, in new program-related information detected and handle before can be through a significant time quantum, thereby may realize to bad data do not expect insert.
Fig. 3-4 illustrates by preventing that according to of the present invention providing the user from attempting utilizing the flow chart of the step that a system of above-mentioned remarkable delay carries out.Feature shown in Fig. 3-4 can be enabled and be controlled by the user, for example by using on-screen display menus to enable and control.The access that realizes and control this obstructions feature can be the access of password protection, promptly needs the user to import a correct password, so that stop the setting of the previous foundation of unauthorized user's modification.Be used for to use these features and the method for the step combination that describes below common known method to be programmed into controller 110.
Equally, when the user begins channel when changing in step 230, system of the present invention carries out a channel change blanking in step 232, and be tuned in the step 234 be tuned to new channel.But, tuning go into this new channel after, and before this TV of not blanking showed, system of the present invention blocked feature based on channel and determines whether this program-related information is enabled in step 236 by this user.If not, this system allows the user to insert this channel in step 264, and withdraws from this program in step 266.
Be activated if channel blocks feature, system then of the present invention determines in step 238 whether this channel of reselecting formerly selects channel identical with step 238.This determines an indication can be provided, and represents that this user constantly retunes to same channel, attempts bypass based on this program-related information of blocking feature.If the channel that should newly select was identical with the previous channel of selecting, then system can experience two additional selection steps, or arrive step 268 immediately, the user is prevented from the access of this new channel therein, and carry out subsequently and handle, determine a program-related information and determine whether the obstruction standard that this user selects satisfies.
Can select in the step 246 first, system determines that whether the channel of the new selection that this had before comprised bad data is by previous detection program-related information indication.Use the previous program-related information that detects to make that the program-related information that needs is determined fast.Step 246 may further include for one that is detected in whether the program-related information of the previous detection of this new selection channel is during a preset time to be determined.This will prevent that decision to the channel of blanking of blanking/no longer is based on no longer relevant program-related information.For this purpose, before selected channel and/or formerly select the program-related information of the channel before the channel in controller 110, to store a preset time phase.
In addition, a counter or a timer can be used to determine in definite programs stored relevant information arranged the time how long in the past.Conventional method can be used to store the relevant information of a previous detection program and determine how long had before this information is detected.If the previous detection program-related information of the new channel of selecting is not indicated the bad data in the phase scheduled time, system then of the present invention allows the user to be linked into this channel by step 242 and 244.Can find out that when this user did not plan to be this program-related information of basic bypass with choke system, selectable step 246 made this user switch fast and gets back to a previous channel of selecting.
If system of the present invention determines that the previous detection program-related information of this new selection channel indicates bad data in optional step 246, then can insert optional step 261, determine whether that this user retunes same channel repeatedly.Constantly retune at least one predetermined times of same channel, represent that further this user is attempting to be characterized as this program-related information of basic bypass with obstruction.Require retuning of a predetermined quantity, can avoid not attempting the user's of this obstruction feature of bypass inconvenience.
Can find out, step 270-284 corresponding to above-mentioned Fig. 2 relevant step 212-226 of system.In fact, system of the present invention tries hard to detect program-related information continuously within a scheduled time amount, subsequently by the program-related information that detects and a user selected program relevant information are compared, determine whether that the obstruction standard that a user selects is satisfied, and the control user is defined as the channel that benchmark is linked into this selection with this.
Further, system of the present invention provides to resist by constantly changing between different channel and has attempted the supplementary protection layer that the bypass program-related information is blocked feature.This protection is provided by step 240-244.In case system determines that in step 238 this new frequency-selecting road is different from the channel of previous selection, then step 240 determines that whether this new frequency-selecting road is with identical near this previous channel selected channel before of selecting.One of step 240 sure response is represented that then this user may be between two channels switches so that utilize above-mentioned time of delay to and fro.In this case, system forwards optional step 246 again to, determine formerly whether to represent bad data in the selected channel channel before, and if then avoid being linked into this channel.Optional step 261 can be inserted into equally, makes the channel switch of doing a pre-determined number in the program-related information that is characterized as the basis with obstruction before being activated.If optional step 246 and 261 does not exist, system of the present invention forwards step 268 to, keeps this new channel by blanking.
Can be found out that modify steps 240 as required, bypass should be based on the program-related information of choke system by the channel of rotating predetermined quantity so that stop this user.
If this channel of reselecting is different from the channel of previous selection or had before selected channel channel before, system then of the present invention this same channel counter in step 242 is set to 0, allow the user in step 244, to be linked into this channel, and indicate as step 270-284, enter the detection program-related information, and determine whether user-selected obstruction standard is satisfied.
Describe from the angle of a most preferred embodiment though it will be apparent to those skilled in the art that the present invention, under the condition that does not deviate from essence of the present invention, can realize modifications and variations disclosed embodiment.
Can see, above-mentioned channel blanking can use the one of any of some common known methods to realize, or the combination of using method realizes, for example be built into machine-processed a realization of normal channel change blanking mechanism another blanking of cooperation in the signal receiver by using, so that be provided at the additional blanking outside this normal channel change blanking cycle, or by in this blanking cycle, using normal channel change blanking mechanism to make this blanking cycle according to the expectation expansion.
And the series of steps shown in Fig. 3-4 can realize that programme signal therein comprises supplementary at analog-and digital-multiple signal format.Said system and method can be fit to one of enough tuning a plurality of signal channels of energy supply and provide any receiving system of an output signal relevant with this tuning signal channel to use.So, TV, the digital television receiver that can be fit to for (but be not limited to) NTSC, PAL or SECAM signal of the present invention uses, for example for digital satellite signal receiver and HDTV receiver, VCR with based on the Internet use of audio system.
And this device can be modified so that compile a record attempting reselecting the channel quantity that comprises bad program often.The record of this compiling can be used for automatically blocking to fall some channel subsequently, or the selection of blocking to fall some channel for pre-this user.
In addition, the quantity of reselecting a specific channel with the trial in a preset time is benchmark, and this device can be modified so that control output signal in a predetermined mode.Equally, such device can be equipped with a recording mechanism and a channel selection record in proper order is provided, and a selection of automatically blocking to fall some channel or blocking to fall some channel for this user.Use this device to combine the selection that this device can automatically block to fall some channel or block to fall some channel for this user in the time period of determining with the record of a timer and channel selection order.
And, this device is fit to sacrificial vessel has a television system of a plurality of signal input parts to use, wherein when the user selects outside source, device automatically blocks and an output signal that outside source is relevant, at least to be detected from the relevant program-related information of this outside source till, and at carry out determining from outside source whether the obstruction standard that this user selects is satisfied.
Therefore, should be appreciated that and the present invention includes all modifications that fall into the present invention spirit scope.
Claims (13)
1. device comprises:
A data receiver (120,122) is used for from the channel selection of user's received signal;
A signal input part (100,105) is used to receive a programme signal relevant with one of a plurality of signal channels, and said signal input part responds said signal channel selection and selects one of described a plurality of signal channels;
A signal output part (RGB OUT) is used to provide an output signal that obtains from said programme signal;
An auxiliary data decoder (115) is used for detecting the program-related information that is included in each said programme signal; With
A processor (112), be operably connected to said data receiver, said signal input part, said signal output part and said auxiliary data decoder, wherein said processor is controlled said output signal in a predetermined mode, when being received in proper order, reduce the access of user to said programme signal with prearranged signal channel selection of box lunch.
2. 1 device as requested, when wherein the predefined procedure of selecting when said signal channel was received, said processor was controlled said output signal with said predetermined way, till being determined at least to said program-related information.
3. 1 device as requested, wherein said programme signal is a TV signal.
4。1 device as requested, wherein said programme signal comprises a plurality of digital signal data bags.
5. 1 device as requested, wherein said prearranged signals channel selection comprises the predetermined quantity of the Continuous Selection of a signal specific channel in proper order.
6. 1 device as requested, wherein said prearranged signals channel selection comprises the predetermined quantity of the Continuous Selection of said signal specific channel, a secondary signal channel and said signal specific channel in proper order.
7. 1 device as requested, wherein the predefined procedure of selecting when said signal channel is received and when having selected first blocking model, said processor is controlled said output signal with said predetermined way.
8. according to the device of claim 7, wherein said processor can provide an on-screen display menus, so that allow the user to select said first blocking model.
9. the on-screen display menus that device according to Claim 8, wherein said processor can provide a restriction to insert is so that allow the user to select said first blocking model.
10. according to the device of claim 9, wherein to the access of said on-screen display menus by password protection.
11. according to the device of claim 1, wherein the predetermined way of said control comprise this vision signal of blanking, with a displaying information on screen substitute this vision signal, to audio signal quiet with forbid one of relevant closed caption.
12. device according to claim 1, wherein when the predefined procedure of said signal channel selection is detected, unless it is that said processor is controlled said output signal with said predetermined way in the acceptable value within the phase scheduled time that said program-related information is determined in advance as.
13. 1 device as requested, also comprise a secondary signal input (101,102), be used for receiving one second programme signal from an outside source, an and change over switch (140), be operably connected to signal input part, said secondary signal input, said signal output part and said signal processor, response is selected from this user's a signal source, said change over switch utilizes said signal to export operationally be coupled one of said programme signal and said second programme signal, wherein when a new signal source is selected to be received, at least till said program-related information has been determined, said signal processor is controlled said output signal with a predetermined way, so that reduce the access of user to said output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB971825246A CN1161993C (en) | 1997-12-18 | 1997-12-18 | Program signal blocking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB971825246A CN1161993C (en) | 1997-12-18 | 1997-12-18 | Program signal blocking system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1286871A true CN1286871A (en) | 2001-03-07 |
| CN1161993C CN1161993C (en) | 2004-08-11 |
Family
ID=5178569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971825246A Expired - Lifetime CN1161993C (en) | 1997-12-18 | 1997-12-18 | Program signal blocking system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1161993C (en) |
-
1997
- 1997-12-18 CN CNB971825246A patent/CN1161993C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1161993C (en) | 2004-08-11 |
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