CN107959867B - Signal generator and set top box with same - Google Patents
Signal generator and set top box with same Download PDFInfo
- Publication number
- CN107959867B CN107959867B CN201610895768.9A CN201610895768A CN107959867B CN 107959867 B CN107959867 B CN 107959867B CN 201610895768 A CN201610895768 A CN 201610895768A CN 107959867 B CN107959867 B CN 107959867B
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- switch
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- signal generator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
- Electronic Switches (AREA)
Abstract
The present invention provides a signal generator comprising: the first signal generator is used for generating slow blanking signals and comprises a first switch, a second switch and a first resistance network, wherein the first switch and the second switch are respectively controlled by the outside world to generate at least one slow blanking signal; and the second signal generator is used for generating a fast blanking signal and comprises a third switch, a fourth switch and a second resistor network, wherein the third switch and the fourth switch are controlled by the outside world to generate at least one fast blanking signal. The signal generator has small occupied area, achieves the aims of simple structure, low cost, wide output load impedance and high reliability, and is very suitable for communication products.
Description
Technical Field
The present invention relates to a signal generating apparatus, and more particularly, to a signal generator for generating a fast blanking signal and a slow blanking signal and a set-top box having the same.
Background
The SCART (synchronized structures 'radios devices' devices et T devices) interface is a special audio-video interface, which is an audio-video equipment interconnection industry standard developed by the company perotel of france, and is also an interconnection and intercommunication interface that europe mandates for satellite television receivers, televisions, video recorders and other audio-video equipment. In fact, SCART includes not only audio and video signals, but also fast blanking signals and slow blanking signals, which function to indicate the tv screen ratio and the video format category. A professional chip is adopted on a traditional set top box to generate a fast blanking signal and a slow blanking signal, but the professional chip is high in cost and complex in structure, and various problems exist in application. Therefore, in order to save cost and simplify design, it is urgently needed to provide a signal generator with simple structure, low cost, wide output load impedance and high reliability to generate the fast blanking signal and the slow blanking signal.
Disclosure of Invention
In view of the above, there is a need to provide a signal generator and a set-top box having the same, so as to satisfy the requirements of simple structure, low cost, wide output load impedance and high reliability, thereby optimizing the design of the product.
An embodiment of the present invention provides a signal generator, including:
the first signal generator is used for generating slow blanking signals and comprises a first switch, a second switch and a first resistance network, wherein the first switch and the second switch are respectively controlled by the outside world to generate at least one slow blanking signal; and
and the second signal generator is used for generating a fast blanking signal and comprises a third switch, a fourth switch and a second resistor network, wherein the third switch and the fourth switch are controlled by the outside world to generate at least one fast blanking signal.
Preferably, the first switch, the second switch, the third switch and the fourth switch are triodes, wherein the first switch, the second switch and the fourth switch are NPN triodes, and the third switch is a PNP triode.
Preferably, the first resistor network comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, wherein one end of the first resistor is electrically connected with an external first control port, and the other end of the first resistor is electrically connected with the first switch base; one end of the second resistor is electrically connected with an external second control port, and the other end of the second resistor is electrically connected with the second switch base electrode; the collector of the first switch is electrically connected to the third resistor, the fourth resistor, the fifth resistor and the sixth resistor, the other end of the third resistor is connected to a first direct-current voltage source, the other end of the fourth resistor is electrically connected to the collector of the second switch, the fifth resistor is grounded, and the other end of the sixth resistor is electrically connected to a load; the emitters of the first switch and the second switch are respectively grounded.
Preferably, the second resistor network includes a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, wherein one end of the seventh resistor is electrically connected to the base of the third switch, and the other end of the seventh resistor is electrically connected to an external third control port; one end of the ninth resistor is electrically connected to the base of the fourth switch, and the other end of the ninth resistor is electrically connected to the external third control port; the emitter of the third switch is electrically connected to a second direct current voltage source, and the collector of the third switch is electrically connected to the eighth resistor; the other end of the eighth resistor is electrically connected to the tenth resistor, the fourth switch collector and the load respectively; the other end of the tenth resistor is electrically connected to the second direct-current voltage source; the fourth switch emitter is grounded.
The set top box comprises a signal generator, wherein the signal generator comprises a first switch, a second switch, a third switch, a fourth switch, a first resistor network and a second resistor network, the signal generator is controlled by a chip in the set top box to generate at least one slow blanking signal, and the slow blanking signal is input into a television to control the video playing size of the television; the signal generator is further used for generating at least one fast blanking signal, and the fast blanking signal is used for controlling the video signal format of the television for playing video.
Preferably, the first switch, the second switch, the third switch and the fourth switch are triodes, wherein the first switch, the second switch and the fourth switch are NPN triodes, and the third switch is a PNP triode.
Preferably, the first resistor network comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, wherein one end of the first resistor is electrically connected with an external first control port, and the other end of the first resistor is electrically connected with the first switch base; one end of the second resistor is electrically connected with an external second control port, and the other end of the second resistor is electrically connected with the second switch base electrode; the collector of the first switch is electrically connected to the third resistor, the fourth resistor, the fifth resistor and the sixth resistor, the other end of the third resistor is connected to a first direct-current voltage source, the other end of the fourth resistor is electrically connected to the collector of the second switch, the fifth resistor is grounded, and the other end of the sixth resistor is electrically connected to a load; the emitters of the first switch and the second switch are respectively grounded.
Preferably, the second resistor network includes a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, wherein one end of the seventh resistor is electrically connected to the base of the third switch, and the other end of the seventh resistor is electrically connected to an external third control port; one end of the ninth resistor is electrically connected to the base of the fourth switch, and the other end of the ninth resistor is electrically connected to the external third control port; the emitter of the third switch is electrically connected to a second direct current voltage source, and the collector of the third switch is electrically connected to the eighth resistor; the other end of the eighth resistor is electrically connected to the tenth resistor, the fourth switch collector and the load respectively; the other end of the tenth resistor is electrically connected to the second direct-current voltage source; the fourth switch emitter is grounded.
The signal generator has the advantages of simple structure, low cost, wide output load impedance and high reliability, and is very suitable for being applied to communication products.
Drawings
Fig. 1 is a block diagram of a signal generator according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of a first signal generator in the signal generator of the present invention.
Fig. 3 is a schematic structural diagram of an embodiment of a second signal generator in the signal generator of the present invention.
Fig. 4 is a block diagram of an embodiment of a set-top box to which the signal generator of the present invention is applied.
Description of the main elements
Set-top box 10
First control port A
Second control port B
Third control port D
First to tenth resistors R1 to R10
First switch Q1
Second switch Q2
Third switch Q3
Fourth switch Q4
First direct voltage source VCC0
Second DC voltage source VCC1
First output port C
Second output port E
Detailed Description
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
The specific parameters of the following embodiments are only for better illustrating the present invention, but the scope of the claims of the present invention should not be limited by specific numerical values.
Referring to fig. 1, fig. 1 is a block diagram of a signal generator 110 according to an embodiment of the invention.
It can be seen from fig. 1 that the signal generator 110 comprises two parts, a first signal generator 1111 and a second signal generator 1112. Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of the first signal generator 1111.
As shown in fig. 2, the first signal generator 1111, configured to generate a slow blanking signal, includes a first switch Q1, a second switch Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. In this embodiment, the first switch Q1 and the second switch Q2 may be a triac, a photocoupler, an optocoupler triac, a triode, a relay and/or a MOS transistor, as shown in fig. 2, in the first signal generator 1111 of the present invention, the first switch Q1 and the second switch Q2 are exemplified by an NPN triode, and those skilled in the art may select different switches to replace or modify the switches according to requirements. One end of the first resistor R1 is electrically connected with a first control port A, and the other end is electrically connected with the base of the first switch Q1; one end of the second resistor R2 is electrically connected with a second control port B, and the other end is electrically connected with the base of the second switch Q2; a collector of the first switch Q1 is electrically connected to the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6, another end of the third resistor R3 is connected to a first direct current voltage source VCC0, another end of the fourth resistor R4 is electrically connected to a collector of the second switch Q2, the fifth resistor R5 is grounded, and another end of the sixth resistor R6 is electrically connected to the first output port C; the emitters of the first switch Q1 and the second switch Q2 are grounded, respectively. The first control port a and the second control port B are controlled by the outside world, and may be electrically connected to an external control chip, and receive a control signal of the external control chip to control the on/off of the first switch Q1 and the second switch Q2 so as to output different signals. For example, the first dc voltage source VCC0 may be 12V, the external control chip sends a high level to the first control port a to turn on the first switch Q1, and sends a low level to the second control port B to turn off the second switch Q2, and when impedances of a load connected to the first output port C are 0.5K Ω and 500M Ω, respectively, it may be obtained that output voltages of the first output port C are both low voltages, which are less than 0.2V. For another example, the first dc voltage source VCC0 may be 12V, the external control chip sends a low level to the first control port a to turn off the first switch Q1, and sends a high level to the second control port B to turn on the second switch Q2, and when impedances of a load connected to the first output port C are 0.5K Ω and 500M Ω, output voltages of the first output port C are both 5.04V and 6.1V, respectively. For another example, the first dc voltage source VCC0 may be 12V, the external control chip sends a low level to the first control port a to turn off the first switch Q1, and sends a low level to the second control port B to turn off the second switch Q2, and when the impedances of the load connected to the first output port C are 0.5K Ω and 500M Ω, the output voltages of the first output port C are 10V and 12V, respectively. The load may be a tv set, and as can be seen from the above description, the load connected to the first signal generator 1111 has good performance under different conditions from 0.5K Ω -500M Ω, so the first signal generator 1111 has a very wide output load impedance.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of the second signal generator 1112.
As shown in fig. 3, the second signal generator 1112 includes a third switch Q3, a fourth switch Q4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10, wherein one end of the seventh resistor R7 is electrically connected to the base of the third switch Q3, and the other end is electrically connected to the third control port D; one end of the ninth resistor R9 is electrically connected to the base of the fourth switch Q4, and the other end is electrically connected to the third control port D; the emitter of the third switch Q3 is electrically connected to the second dc voltage source VCC1, and the collector is electrically connected to the eighth resistor R8; the other end of the eighth resistor R8 is electrically connected to the tenth resistor R10, the collector of the fourth switch Q4 and the second output port E, respectively; the other end of the tenth resistor R10 is electrically connected to the second dc voltage source VCC 1; the emitter of the fourth switch Q4 is grounded. In this embodiment, the third switch Q3 and the fourth switch Q4 may be a triac, a photocoupler, an optically coupled triac, a triode, a relay and/or a MOS transistor, as shown in fig. 3, the third switch Q3 in the second signal generator 1112 of the present invention is illustrated by a PNP triode, and the fourth switch Q4 is illustrated by an NPN triode, which, of course, can be replaced and modified by those skilled in the art. Wherein, the external control chip controls the second signal generator 1112 to output different signals by sending different potential signals to the third control port D. For example, the second dc voltage source may be 3.3V, when the external control chip sends a high level to the third control port D, the third switch Q3 is turned off, and the fourth switch Q4 is turned on, when the second output port E is connected to a load with impedances of 500 Ω and 500M Ω, respectively, a low voltage close to 0V may be obtained as the output voltage of the second output port E. For another example, the second dc voltage source may be 3.3V, when the external control chip sends a low level to the third control port D, the third switch Q3 is turned on, the fourth switch Q4 is turned off, and when the second output port E is connected to a load with impedances of 500 Ω and 500M Ω, the output voltages of the second output port E may be 3.65V and 3V, respectively. The load may be a tv set, and as can be seen from the above description, the load connected to the second signal generator 1112 has good performance under different conditions from 500 Ω -500M Ω, so the second signal generator 1112 has a very wide output load impedance.
Fig. 4 is a block diagram of an embodiment of a set-top box 10 to which the signal generator 110 of the present invention is applied.
As shown, the set-top box 10 comprises a signal generator 110, the signal generator 110 comprises a first signal generator 1111 and a second signal generator 1112, wherein the first signal generator 1111 is controlled by the chip 120 in the set-top box 10 to generate at least one slow blanking signal, and the slow blanking signal is input to the television to control the video playing size of the television; the second signal generator 1112 is configured to generate at least one fast blanking signal for controlling a video signal format of the television for playing video. The first control port a, the second control port B and the third control port D may be electrically connected to a general control port of the set-top box 10. In conjunction with the previous description of the first signal generator 1111 and the second signal generator 1112, the signal generated by the first signal generator 1111 includes three signals, and when the signal generator 110 is applied to the set-top box 10, the signal generator 110 can be used to generate the slow blanking signal and the fast blanking signal, that is, the three signals generated by the first signal generator 1111 can be respectively used to control the screen of the tv to display different sizes, for example, when the first signal generator 1111 outputs a low voltage with an amplitude of 0-2V, the screen of the tv displays no signal input; when the first signal generator 1111 outputs an amplitude of 4.5-7V, the tv screen displays 16: 9, broadband size; when the first signal generator 1111 outputs the amplitude of 9.5-12V, the TV screen displays the normal size of 4: 3. The second signal generator 1112 generates two signals, that is, the fast blanking signal includes two signals, to control the tv to display two different formats of Video signals, for example, when the amplitude value output by the second signal generator 1112 is 0-0.4V, the tv displays a Video format of cvbs (composite Video Broadcast signal); when the output amplitude of the second signal generator 1112 is 1-3V, the TV displays video in RGB format. Of course, it should be understood that the set-top box 10 may include only the first signal generator 1111 or the second signal generator 1112, and may be any combination of the number of the first signal generator 1111 and the second signal generator 1112, and the invention is not limited thereto.
Due to the selection of the technical scheme, the invention has the following beneficial effects:
the signal generator of the invention adopts a plurality of switches and resistors to achieve the aim of outputting the slow blanking signal and the fast blanking signal, and the signal generator of the invention is applied to the set-top box, thereby reducing the use of professional ICs, and achieving the purposes of simple structure, low cost, wide output load impedance and high reliability.
It is understood that various other changes and modifications may be made by those skilled in the art based on the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the claims of the present invention.
Claims (2)
1. A signal generator, characterized in that the signal generator comprises:
the first signal generator is used for generating slow blanking signals and comprises a first switch, a second switch and a first resistance network, wherein the first switch and the second switch are respectively controlled by the outside world to generate at least one slow blanking signal; and
a second signal generator for generating fast blanking signals, comprising a third switch, a fourth switch and a second resistor network, said third switch and fourth switch being controlled by the outside world to generate at least one of said fast blanking signals
The first switch, the second switch, the third switch and the fourth switch are triodes, the first switch, the second switch and the fourth switch are NPN triodes, and the third switch is a PNP triode;
the first resistor network comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, wherein one end of the first resistor is electrically connected with an external first control port, and the other end of the first resistor is electrically connected with the first switch base electrode; one end of the second resistor is electrically connected with an external second control port, and the other end of the second resistor is electrically connected with the second switch base electrode; the collector of the first switch is electrically connected to the third resistor, the fourth resistor, the fifth resistor and the sixth resistor, the other end of the third resistor is connected to a first direct-current voltage source, the other end of the fourth resistor is electrically connected to the collector of the second switch, the fifth resistor is grounded, and the other end of the sixth resistor is electrically connected to a load; the emitters of the first switch and the second switch are respectively grounded; and
the second resistor network comprises a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, wherein one end of the seventh resistor is electrically connected to the base of the third switch, and the other end of the seventh resistor is electrically connected to an external third control port; one end of the ninth resistor is electrically connected to the base of the fourth switch, and the other end of the ninth resistor is electrically connected to the external third control port; the emitter of the third switch is electrically connected to a second direct current voltage source, and the collector of the third switch is electrically connected to the eighth resistor; the other end of the eighth resistor is electrically connected to the tenth resistor, the fourth switch collector and the load respectively; the other end of the tenth resistor is electrically connected to the second direct-current voltage source; the fourth switch emitter is grounded.
2. A set-top box comprising the signal generator of claim 1, wherein the signal generator is controlled by a chip in the set-top box to generate at least one of the slow blanking signals, the slow blanking signal being input to a television to control a video playback size of the television; the signal generator is further configured to generate at least one of the fast blanking signals, and the fast blanking signal is used to control a video signal format of the television for playing video.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610895768.9A CN107959867B (en) | 2016-10-14 | 2016-10-14 | Signal generator and set top box with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610895768.9A CN107959867B (en) | 2016-10-14 | 2016-10-14 | Signal generator and set top box with same |
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| CN107959867A CN107959867A (en) | 2018-04-24 |
| CN107959867B true CN107959867B (en) | 2020-04-03 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5343249A (en) * | 1991-08-23 | 1994-08-30 | Samsung Electronics Co., Ltd. | Apparatus for preventing the simultaneous and overlapping display of characters on a television receiver monitor |
| CN1345163A (en) * | 2000-09-15 | 2002-04-17 | 汤姆森特许公司 | Video-unit for transmission of video signal |
| CN1452838A (en) * | 2000-09-08 | 2003-10-29 | 汤姆森特许公司 | Video apparatus using several video signal sources and process for controling such video apparatus |
| CN1813472A (en) * | 2003-06-27 | 2006-08-02 | 皇家飞利浦电子股份有限公司 | Receiver and method for reducing power consumption in low-power mode |
| KR20070118433A (en) * | 2006-06-12 | 2007-12-17 | 엘지전자 주식회사 | Apparatus and method for outputting an image signal by scart fb signal |
| JP2009141689A (en) * | 2007-12-06 | 2009-06-25 | Toshiba Corp | Analog/digital conversion system and scart-adapted system |
| CN201298882Y (en) * | 2008-12-11 | 2009-08-26 | 青岛海信电器股份有限公司 | Control circuit of fast blanking signal and TV with same |
| CN202009467U (en) * | 2011-03-24 | 2011-10-12 | 深圳创维数字技术股份有限公司 | Detector and set top box |
| CN202183541U (en) * | 2011-05-27 | 2012-04-04 | 康佳集团股份有限公司 | SCART (syndicat des constructeursd' appareils radiorecepteurset televiseyrs) conversion line |
-
2016
- 2016-10-14 CN CN201610895768.9A patent/CN107959867B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5343249A (en) * | 1991-08-23 | 1994-08-30 | Samsung Electronics Co., Ltd. | Apparatus for preventing the simultaneous and overlapping display of characters on a television receiver monitor |
| CN1452838A (en) * | 2000-09-08 | 2003-10-29 | 汤姆森特许公司 | Video apparatus using several video signal sources and process for controling such video apparatus |
| CN1345163A (en) * | 2000-09-15 | 2002-04-17 | 汤姆森特许公司 | Video-unit for transmission of video signal |
| CN1813472A (en) * | 2003-06-27 | 2006-08-02 | 皇家飞利浦电子股份有限公司 | Receiver and method for reducing power consumption in low-power mode |
| KR20070118433A (en) * | 2006-06-12 | 2007-12-17 | 엘지전자 주식회사 | Apparatus and method for outputting an image signal by scart fb signal |
| JP2009141689A (en) * | 2007-12-06 | 2009-06-25 | Toshiba Corp | Analog/digital conversion system and scart-adapted system |
| CN201298882Y (en) * | 2008-12-11 | 2009-08-26 | 青岛海信电器股份有限公司 | Control circuit of fast blanking signal and TV with same |
| CN202009467U (en) * | 2011-03-24 | 2011-10-12 | 深圳创维数字技术股份有限公司 | Detector and set top box |
| CN202183541U (en) * | 2011-05-27 | 2012-04-04 | 康佳集团股份有限公司 | SCART (syndicat des constructeursd' appareils radiorecepteurset televiseyrs) conversion line |
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