CN2669527Y - Children-locking circuit for liquid crystal television receiver - Google Patents
Children-locking circuit for liquid crystal television receiver Download PDFInfo
- Publication number
- CN2669527Y CN2669527Y CNU2003201215510U CN200320121551U CN2669527Y CN 2669527 Y CN2669527 Y CN 2669527Y CN U2003201215510 U CNU2003201215510 U CN U2003201215510U CN 200320121551 U CN200320121551 U CN 200320121551U CN 2669527 Y CN2669527 Y CN 2669527Y
- Authority
- CN
- China
- Prior art keywords
- children
- signal
- circuit
- liquid crystal
- virgin lock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a children-lock circuit for a liquid crystal television, which comprises a CPU, a video decoding chip and a children-lock signal processing circuit. The decoding and the contrasting of composite video signal data can be realized through adding the children-lock signal processing circuit to the input end of an original video decoding chip, Television signals which are not suitable for children to watch are locked by controlling a bus wire by the CPU, and accordingly, the utility model really plays a role in protecting the physical-mental health of children. The circuit has simple and reliable design, and high accuracy, and resolves the problems of slow decoding speed of software, poor decoding accuracy and the easy occurrence of disordered codes. The utility model realizes modularized design to a certain degree, and improves the work efficiency.
Description
Technical field
The utility model relates to a kind of TV set circuit, specifically, makes to relate to a kind of virgin lock signal treatment circuit that is used for liquid crystal TV set.
Background technology
More and more complete along with the liquid crystal TV set function, more user wishes and can effectively control being not suitable for the TV signal that children watch, this just need on the circuit to the signal that contains undesirable constituents can effectively decode, contrast, multinomial processing such as locking.At present, above function is carried out a series of processing to sort signal by software usually in working procedure, has so just produced processing speed and has not caught up with, and the poor accuracy that causes decoding, is prone to phenomenons such as mess code.
Summary of the invention
For overcome in the prior art by software carry out the speed that occurs when virgin lock is handled slowly, the problem of easily makeing mistakes, the utility model provides a kind of simple in structure, hardware handles circuit that accuracy is high, by building of electronic devices and components, realized effective control to TV signal.
For solving the problems of the technologies described above, the utility model is achieved by the following technical programs:
A kind of children-locking circuit of liquid crystal TV set, comprise CPU and video decoding chip, input at described video decoding chip is connected with virgin lock signal treatment circuit, its video signal input terminal receives composite video signal, it is carried out data decode, the flag bit of decoding generation and the table of grading among the CPU are made comparisons, and the output field blanking signal is controlled described video decoding chip locking or is shown.
Composite video signal links to each other with the video signal input terminal of filter capacitor with described virgin lock signal treatment circuit through emitter follower; In described virgin lock signal treatment circuit, also include line synchronizing signal input and field sync signal input, receive outside directly row, the field sync signal of input respectively.
In addition, described virgin lock signal treatment circuit also includes R, G, B signal output part and field blanking signal output part, on the one hand by rc filter circuit ground connection; Link to each other with described video decoding chip on the other hand.
Above-mentioned virgin lock signal treatment circuit adopts a slice Z86129 chip to realize.
Compared with prior art; advantage of the present utility model and good effect are: add virgin lock signal treatment circuit by the input at original video decoding chip; decoding, contrast have been realized to the composite video signal data; and by bus under the control of CPU; lock being unsuitable for the TV signal that children watch, really played the able-bodied effect of protection children.This circuit design is simple and reliable, accuracy is high, remedied that software decode speed is slow, poor accuracy, be prone to the problem of mess code, has realized modularized design to a certain extent, has improved operating efficiency.
Description of drawings
Fig. 1 is the physical circuit figure of the utility model children-locking circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
The video decoding chip model that the utility model adopts is OM8838, can decode to the composite video signal of input, generates simulation R, G, the output of B signal.Be connected with virgin lock signal treatment circuit at its input, can decode, contrast composite video signal and multinomial processing such as locking, realized the functions of child lock of liquid crystal TV set.Wherein, described virgin lock signal treatment circuit adopts one 21 line decoding chip Z86129 to realize that its concrete annexation is referring to shown in Figure 1.
Composite video signal enters chip internal by the video signal input terminal of 21 line decoding chip Z86129 after emitter follower and filter capacitor C332 filtering, carry out data cutting and synchronous cutting.Wherein, the data cutting is extracted the redundant information composition and is obtained a normal data-signal, and synchronous cutting is isolated composite synchronizing signal, is used for showing the vision signal under the lock-out state.As maximum characteristics of the present utility model is to introduce inside and outside synchronous two kinds of selections simultaneously, be made up of through the inter-sync of inner synchronous cutting generation with by the row of chip Z86129, outer row, the field sync signal that field synchronization input HIN, VIN receive composite video signal respectively, these two kinds of selections are decided by bus according to actual conditions by the user fully.
Inside at 21 line decoding chip Z86129 includes status register, and it is communicated by letter by bus (linking to each other with bus control end SCL, SDA) realization and CPU's.Under the control of CPU, the information that comprises in the 21 line data bags of Z86129 chip to field blanking interval is decoded, taking out these information also writes a decoding flag bit in the corresponding status register, by CPU by bus reading of data from register, make comparisons with the grade of setting locking then, will lock this partial information if exceed requirement, control chip Z86129 sends the field blanking signal from the BOX end to video decoding chip OM8838, make picture not show this information, to reach the effect of virgin lock.
In addition, in 21 line decoding chip Z86129, also include address choice end 12CSEL, select the CPU read/write address by putting high-low level; Mode of operation selecting side SMS selects CPU to be operated in mode bus or SPI (Serial Peripheral Interface) pattern by putting high-low level, and the utility model is set to low level to select mode bus with this end ground connection; The LPF end is formed filter network with peripheral RC circuit and is offered inner composite sync clipper circuit work; The CSYNC end is connected with capacitor C 333, storage synchronous cutting level voltage; RED, GREEN, BLUE end are exported to video decoding chip OM8838 with decoded simulation R, G, B signal respectively, video decoding chip OM8838 carries out R, G, B signal and the R that itself decodes, G, the B signal that receives compound, finishes the locking or the demonstration of picture under the control of the field blanking signal that chip Z86129 exports.
In addition, between RED, GREEN, BLUE end and field blanking signal output part BOX and the ground of chip Z86129, be connected with the RC circuit and form filter network, realize filter shape output signal.
The utility model has been realized the functions of child lock of LCD TV by said structure, has successfully solved the problem that picture shows mess code.Certainly, above-mentioned is not to be to restriction of the present utility model for example, and some variations, improvement, interpolation or replacement that those of ordinary skill is made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (6)
1. the children-locking circuit of a liquid crystal TV set, comprise CPU and video decoding chip, it is characterized in that: the input at described video decoding chip is connected with virgin lock signal treatment circuit, its video signal input terminal receives composite video signal, it is carried out data decode, the flag bit of decoding generation and the table of grading among the CPU are made comparisons, and the output field blanking signal is controlled described video decoding chip locking or is shown.
2. the children-locking circuit of liquid crystal TV set according to claim 1, it is characterized in that: described virgin lock signal treatment circuit includes line synchronizing signal input and field sync signal input, receives outside row, the field sync signal of directly importing respectively.
3. the children-locking circuit of liquid crystal TV set according to claim 2, it is characterized in that: composite video signal links to each other with the video signal input terminal of filter capacitor with described virgin lock signal treatment circuit through emitter follower.
4. the children-locking circuit of liquid crystal TV set according to claim 3, it is characterized in that: described virgin lock signal treatment circuit includes R, G, B signal output part and field blanking signal output part, all links to each other with described video decoding chip.
5. the children-locking circuit of liquid crystal TV set according to claim 4 is characterized in that: all be connected with rc filter circuit between the R of described virgin lock signal treatment circuit, G, B signal output part and field blanking signal output part and the ground.
6. the children-locking circuit of liquid crystal TV set according to claim 5 is characterized in that: the realization of described virgin lock signal treatment circuit employing a slice Z86129 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201215510U CN2669527Y (en) | 2003-12-29 | 2003-12-29 | Children-locking circuit for liquid crystal television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201215510U CN2669527Y (en) | 2003-12-29 | 2003-12-29 | Children-locking circuit for liquid crystal television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2669527Y true CN2669527Y (en) | 2005-01-05 |
Family
ID=34439166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2003201215510U Expired - Fee Related CN2669527Y (en) | 2003-12-29 | 2003-12-29 | Children-locking circuit for liquid crystal television receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2669527Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100456830C (en) * | 2006-06-28 | 2009-01-28 | 华为技术有限公司 | User terminal equipment for stream media content checking and checking method |
| WO2011029379A1 (en) * | 2009-09-08 | 2011-03-17 | 中兴通讯股份有限公司 | Method and electronic program guide server for interactive internet protocol television child lock control |
| CN101442638B (en) * | 2008-12-16 | 2013-03-27 | 康佳集团股份有限公司 | Protection method and circuit for television airdrome |
-
2003
- 2003-12-29 CN CNU2003201215510U patent/CN2669527Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100456830C (en) * | 2006-06-28 | 2009-01-28 | 华为技术有限公司 | User terminal equipment for stream media content checking and checking method |
| CN101442638B (en) * | 2008-12-16 | 2013-03-27 | 康佳集团股份有限公司 | Protection method and circuit for television airdrome |
| WO2011029379A1 (en) * | 2009-09-08 | 2011-03-17 | 中兴通讯股份有限公司 | Method and electronic program guide server for interactive internet protocol television child lock control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |