CN101959003A - SCART function selection switching control signal processing circuit and method - Google Patents
SCART function selection switching control signal processing circuit and method Download PDFInfo
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- CN101959003A CN101959003A CN2009101087675A CN200910108767A CN101959003A CN 101959003 A CN101959003 A CN 101959003A CN 2009101087675 A CN2009101087675 A CN 2009101087675A CN 200910108767 A CN200910108767 A CN 200910108767A CN 101959003 A CN101959003 A CN 101959003A
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Abstract
The invention relates to an SCART function selection switching control signal processing circuit and an SCART function selection switching control signal processing method. The circuit comprises a voltage monitoring unit, a level conversion unit and a control signal output unit, wherein a first output end of the voltage monitoring unit is connected with a first input end of the level conversion unit, and a second output end of the voltage monitoring unit is connected with a second input end of the level conversion unit; an output end of the level conversion unit is connected with a first input end of the control signal output unit; a second input end of the control signal output unit is connected with an input end of the voltage monitoring unit and a VCR SCART interface and is used as the input end of the circuit; and an output end of the control signal output unit is connected with a TV SCART interface and is used as the output end of the circuit. The circuit provided by the invention still can realize automatic control of an SCART under the condition of power failure of a main CPU, so that the standby power consumption of a set-top box is reduced below 1W.
Description
Technical field
The present invention relates to set-top box SCART (Syndicat des Constructeursd ' AppareilsRadior é cepteurs et T é l é viseurs) interface signal switching controls technology, particularly a kind of SCART function selecting switch-over control signal treatment circuit and method.
Background technology
The existing set-top box SCART function selecting switch-over control signal treatment circuit of being made up of discrete component, the function selecting control signal of TV SCART interface is by the circuit output of triode design.Function selecting control signal by the VCRSCART input has the design of two classes to TV SCART output: it is the control pin that directly is connected to TV SCART interface by diode that first kind of VCRSCART interface function selected control signal; After second kind of VCR SCART function selecting control signal monitored by the set-top box host CPU, realize control by the function selecting control signal circuit of TV SCART interface.
VCR SCART function selecting control signal directly is connected to the function selecting control signal control pin of TV SCART interface by diode, technological deficiency is: when the lower limit of function selecting control signal at claimed range of input, the function selecting control signal of TV SCART output causes the output error of TVSCART audio frequency and video with incorrect.
After VCR SCART function selecting control signal is monitored by the set-top box host CPU, function selecting control signal circuit by the TVSCART interface is realized control, and technological deficiency is: VCR SCART function selecting control signal can not be input to the function selecting control signal control pin of TV SCART interface after the host CPU power down.
Summary of the invention
The technical problem to be solved in the present invention is, at the above-mentioned defective of prior art, provides a kind of SCART function selecting switch-over control signal treatment circuit and method, and SCART still can realize automatic control under the situation of host CPU power down.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of SCART function selecting switch-over control signal treatment circuit, comprise voltage monitoring unit, level conversion unit, control signal output unit.
First output of voltage monitoring unit is connected with the first input end of level conversion unit, and second output of voltage monitoring unit is connected with second input of level conversion unit; The output of level conversion unit is connected with the first input end of control signal output unit; Second input of control signal output unit is connected with the input of voltage monitoring unit and VCR SCART interface and as the input of described circuit, and the output of control signal output unit is connected with TV SCART interface and as the output of described circuit.
In SCART function selecting switch-over control signal treatment circuit of the present invention, described control signal output unit comprises the VCR signal output unit.
In SCART function selecting switch-over control signal treatment circuit of the present invention, described control signal output unit comprises the 3rd input that is used for external host CPU.
In SCART function selecting switch-over control signal treatment circuit of the present invention, when described host CPU monitors described VCR SCART interface signal, VCR signal output unit unlatching work.
In SCART function selecting switch-over control signal treatment circuit of the present invention, the VCR SCART function selecting control signal that inputs to the voltage monitoring unit input is not controlled by host CPU, and this signal is handled the back via voltage detection unit and level conversion unit and exported by the VCR signal output unit.
The present invention also provides a kind of SCART function selecting switch-over control signal processing method, comprises step:
S1) level of the VCR SCART function selecting control signal of monitoring VCR SCART interface input produces the level monitoring signal;
S2) the level monitoring signal that step S1 is produced carries out level conversion, produces function selecting control signal level;
S3) export the function selecting control signal level that step S2 is produced.
In SCART function selecting switch-over control signal processing method of the present invention, among the step S1:
When the level of VCR SCART function selecting control signal is 0～2V, produce the first level monitoring signal of 3.3V and the second level monitoring signal of 3.3V;
When the level of VCR SCART function selecting control signal is 4.5～7V, produce the first level monitoring signal of 0V and the second level monitoring signal of 3.3V;
When the level of VCR SCART function selecting control signal is 9.5～12V, produce the first level monitoring signal of 0V and the second level monitoring signal of 0V.
In SCART function selecting switch-over control signal processing method of the present invention, among the step S2,
When the first level monitoring signal and the second level monitoring signal are 3.3V, produce the function selecting control signal level of 0V;
When the first level monitoring signal is 0V, when the second level monitoring signal is 3.3V, produce the function selecting control signal level of 7V;
When the first level monitoring signal and the second level monitoring signal are 0V, produce the function selecting control signal level of 12V.
In SCART function selecting switch-over control signal processing method of the present invention, also comprise step:
S4) whether host CPU is monitored VCR SCART function selecting control signal automatically and is existed, and according to the output of monitoring result control TV signal.
In SCART function selecting switch-over control signal processing method of the present invention, when host CPU monitored VCR SCART function selecting control signal, host CPU stopped the output of TV signal; When host CPU did not monitor VCR SCART function selecting control signal, host CPU kept the TV signal to export TV SCART interface to.
Implement technical scheme of the present invention, have following beneficial effect: SCART function selecting switch-over control signal treatment circuit provided by the invention and method still can realize the automatic control of SCART under the situation of host CPU power down, VCR SCART function selecting control signal still can input to the function selecting control signal control pin of TV SCART interface by circuit of the present invention, makes the power consumption of set-top box to be reduced to below the 1W.And when host CPU had powered on the input of VCR SCART function selecting control signal, the control of host CPU was with inoperative.Level conversion by level conversion unit has guaranteed that TV SCART function selecting control signal level meets the demands.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the SCART function selecting switch-over control signal treatment circuit logic diagram of the preferred embodiment of the present invention;
Fig. 2 is the voltage monitoring unit circuit diagram of the SCART function selecting switch-over control signal treatment circuit of the preferred embodiment of the present invention;
Fig. 3 is the level conversion unit circuit diagram of the SCART function selecting switch-over control signal treatment circuit of the preferred embodiment of the present invention;
Fig. 4 is the control signal output unit circuit diagram of the SCART function selecting switch-over control signal treatment circuit of the preferred embodiment of the present invention;
Fig. 5 is the flow chart of the SCART function selecting switch-over control signal processing method of the preferred embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The function selecting control signal of SCART is that the aspect ration and the television signal input TV/AV of control SCART television set receiver, video switches.Function selecting control signal level is 0-2V, television signal input TV; Function selecting control signal level is 4.5-7V, and the aspect ration of television signal input AV and video is 16: 9; Function selecting control signal level is 9.5-12V, and the aspect ration of television signal input AV and video is 4: 3.
The invention provides a kind of SCART function selecting switch-over control signal treatment circuit, Fig. 1 shows the SCART function selecting switch-over control signal treatment circuit logic diagram of the preferred embodiment of the present invention, comprises voltage monitoring unit 100, level conversion unit 200, control signal output unit 300.
Fig. 2 shows the voltage monitoring unit circuit diagram of the SCART function selecting switch-over control signal treatment circuit of the preferred embodiment of the present invention.Voltage monitoring unit 100 comprises the first triode Q1, the second triode Q2, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, first capacitor C 1.
One end of first capacitor C 1 is connected with an end of first resistance R 1 and an end and first power supply of second resistance R 2, the other end ground connection of first capacitor C 1, the other end of first resistance R 1 is connected with the collector electrode of the second triode Q2, the other end of second resistance R 2 is connected with the collector electrode of the first triode Q1,4 cross-over connections of the 4th resistance R are between the base stage and emitting stage of the second triode Q2,6 cross-over connections of the 6th resistance R are between the base stage and emitting stage of the first triode Q1, the emitting stage ground connection of the first triode Q1 and the second triode Q2, one end of one end of the 3rd resistance R 3 and the 5th resistance R 5 all is connected with the input of described voltage monitoring unit 100, the other end of the 3rd resistance R 3 is connected with the base stage of the second triode Q2, and the other end of the 5th resistance R 5 is connected with the base stage of the first triode Q1.
The voltage of two output FNC_IN1 and FNC_IN2 all was 3.3V when the function selecting control signal level of the input VCR_SENCE of voltage monitoring unit 100 input was 0-2V; When function selecting control signal level was 4.5-7V, the voltage of the first output FNC_IN1 was 0V, and the voltage of the second output FNC_IN2 is 3.3V; When function selecting control signal level was 9.5-12V, the voltage of the first output FNC_IN1 and the second output FNC_IN2 all was 0V.
FNC_IN1 that voltage monitoring unit 100 produces and FNC_IN2 signal produce different function selecting control signal level by the level conversion unit 200 of the SCART function selecting switch-over control signal treatment circuit of the preferred embodiment of the present invention shown in Figure 3.When the voltage of the level conversion unit 200 first input end FNC_IN1 and the second input FNC_IN2 all was 3.3V, the output voltage of level conversion unit 200 output VCR_SENSE1 was 0V; The voltage of level conversion unit 200 first input end FNC_IN1 is the voltage of the 0V and the second input FNC_IN2 when being 3.3V, and the output voltage of level conversion unit 200 output VCR_SENSE1 is 7.0V; When the voltage of the level conversion unit 200 first input end FNC_IN1 and the second input FNC_IN2 all was 0V, the output voltage of level conversion unit 200 output VCR_SENSE1 was 12V.
The 11 resistance R 11 1 ends are connected with the output of the 14 resistance R 14 1 ends and described level conversion unit 200, the 11 resistance R 11 other ends are connected with the 12 resistance R 12 1 ends and second source, the 12 resistance R 12 other ends are connected with the output of the 13 resistance R 13 1 ends and described level conversion unit 200, the 13 resistance R 13 other ends are connected with the collector electrode of the 4th triode Q4, and the 14 resistance R 14 other ends are connected with the collector electrode of the 5th triode Q5; The 15 resistance R 15 1 ends are connected with the base stage of the 5th triode Q5, and the other end is connected with second input of described level conversion unit 200; The 16 resistance R 16 1 ends are connected with the base stage of the 4th triode Q4, and the other end is connected with the first input end of described level conversion unit 200; The equal ground connection of emitter of the 4th triode Q4 and the 5th triode Q5; Second capacitor C, 191 1 end ground connection, another termination second source.
Fig. 4 shows the control signal output unit circuit diagram of the SCART function selecting switch-over control signal treatment circuit of the preferred embodiment of the present invention.The VCR_SENSE1 output voltage produces the TV-FUNCTION signal through control signal output unit 300, and the TV-FUNCTION signal is connected to TV-SCART the 8th pin, has just realized the control of VCR SCART function selecting control signal to TV SCART.
Control signal output unit 300 comprises VCR signal output unit (mainly comprising Q8, Q9, Q3, D2 etc.).
The external host CPU (not shown) that is used for bypass monitoring VCR SCART interface signal and controls the output of TV signal of the 3rd input VCR_DETEC of control signal output unit 300.The VCR_DETEC monitor signal is given host CPU, when host CPU monitors VCR SCART interface control signal when input is arranged, and host CPU is closed the output (not shown) of TV signal, VCR signal output unit unlatching work.This moment, the output of TV-FUNCTION signal was controlled by the VCR interface fully.When host CPU monitors VCR SCART interface in control signal when input, TV-FUNCTION output TV signal, do not arranged.
The present invention is under the situation of host CPU power down, and SCART also can control automatically.When the host CPU power supply was turned off, the control of host CPU was with inoperative.The Q3 triode B utmost point is connected to VCR_SENSE, when VCR_SENSE voltage is 4.5-7V and 9.5-12V, and the Q3 conducting, Q9 triode B pole tension is 0V, the voltage of VCR_SENSE1 can be through Q8, D2 to TV-FUNCTION.Thereby the reduction power consumption is saved electricity consumption, makes the power consumption of set-top box to reduce to below the 1W.
In the preferred embodiments of the present invention, the first output FNC_IN1 of voltage monitoring unit 100 is connected with the first input end FNC_IN1 of level conversion unit 200, and the second output FNC_IN2 of voltage monitoring unit 100 is connected with the second input FNC_IN2 of level conversion unit 200; The output VCR_SENCE1 of level conversion unit 200 is connected with the first input end VCR_SENCE1 of control signal output unit 300; The second input VCR_SENCE of control signal output unit 300 and the input VCR_SENCE of voltage monitoring unit 100 and VCR SCART interface is connected and as the input of described circuit, the output TV-FUNCTION of control signal output unit 300 are connected with TV SCART interface and as the output of described circuit.
Fig. 5 shows the flow chart of the SCART function selecting switch-over control signal processing method of the preferred embodiment of the present invention.This method may further comprise the steps:
S1) level of the VCR SCART function selecting control signal of monitoring VCR SCART interface input produces the level monitoring signal;
When the level of VCR SCART function selecting control signal is 0～2V, produce the first level monitoring signal of 3.3V and the second level monitoring signal of 3.3V;
When the level of VCR SCART function selecting control signal is 4.5～7V, produce the first level monitoring signal of 0V and the second level monitoring signal of 3.3V;
When the level of VCR SCART function selecting control signal is 9.5～12V, produce the first level monitoring signal of 0V and the second level monitoring signal of 0V.
S2) the level monitoring signal that step S1 is produced carries out level conversion, produces function selecting control signal level;
When the first level monitoring signal and the second level monitoring signal are 3.3V, produce the function selecting control signal level of 0V;
When the first level monitoring signal is 0V, when the second level monitoring signal is 3.3V, produce the function selecting control signal level of 7V;
When the first level monitoring signal and the second level monitoring signal are 0V, produce the function selecting control signal level of 12V.
S3) the function selecting control signal level that produced of output step S2 is to TV SCART interface.
S4) whether host CPU is monitored VCR SCART function selecting control signal automatically and is existed, and according to the output of monitoring result control TV signal.
When host CPU monitored VCR SCART function selecting control signal, host CPU stopped the output of TV signal.
When host CPU did not monitor VCR SCART function selecting control signal, host CPU kept the TV signal to export TV SCART interface to.
SCART function selecting switch-over control signal treatment circuit provided by the invention and method still can realize the automatic control of SCART under the situation of host CPU power down, VCR SCART function selecting control signal still can input to the function selecting control signal control pin of TV SCART interface by circuit of the present invention.Make the power consumption of set-top box to be reduced to below the 1W.Level conversion by level conversion unit has guaranteed that TV SCART function selecting control signal level meets the demands.And power-down state has VCR SCART function selecting control signal when input on host CPU, and the control of host CPU is with inoperative.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a SCART function selecting switch-over control signal treatment circuit is characterized in that, comprises voltage monitoring unit (100), level conversion unit (200), control signal output unit (300);
First output of voltage monitoring unit (100) is connected with the first input end of level conversion unit (200), and second output of voltage monitoring unit (100) is connected with second input of level conversion unit (200); The output of level conversion unit (200) is connected with the first input end of control signal output unit (300); The input of second input of control signal output unit (300) and voltage monitoring unit (100) and VCR SCART interface is connected and as the input of described circuit, the output of control signal output unit (300) are connected with TV SCART interface and as the output of described circuit.
2. SCART function selecting switch-over control signal treatment circuit according to claim 1 is characterized in that described control signal output unit (300) comprises the VCR signal output unit.
3. SCART function selecting switch-over control signal treatment circuit according to claim 2 is characterized in that described control signal output unit (300) comprises the 3rd input that is used for external host CPU.
4. SCART function selecting switch-over control signal treatment circuit according to claim 3 is characterized in that, when described host CPU monitors described VCR SCART interface signal, and VCR signal output unit unlatching work.
5. SCART function selecting switch-over control signal treatment circuit according to claim 1, it is characterized in that, the VCR SCART function selecting control signal that inputs to voltage monitoring unit (100) input is not controlled by host CPU, and this signal is handled the back via voltage detection unit (100) and level conversion unit (200) and exported by the VCR signal output unit.
6. a SCART function selecting switch-over control signal processing method is characterized in that, comprises step:
S1) level of the VCR SCART function selecting control signal of monitoring VCR SCART interface input produces the level monitoring signal;
S2) the level monitoring signal that step S1 is produced carries out level conversion, produces function selecting control signal level;
S3) the function selecting control signal level that produced of output step S2 is to TV SCART interface.
7. SCART function selecting switch-over control signal processing method according to claim 6 is characterized in that, among the step S1:
When the level of VCR SCART function selecting control signal is 0～2V, produce the first level monitoring signal of 3.3V and the second level monitoring signal of 3.3V;
When the level of VCR SCART function selecting control signal is 4.5～7V, produce the first level monitoring signal of 0V and the second level monitoring signal of 3.3V;
When the level of VCR SCART function selecting control signal is 9.5～12V, produce the first level monitoring signal of 0V and the second level monitoring signal of 0V.
8. SCART function selecting switch-over control signal processing method according to claim 6 is characterized in that, among the step S2,
When the first level monitoring signal and the second level monitoring signal are 3.3V, produce the function selecting control signal level of 0V;
When the first level monitoring signal is 0V, when the second level monitoring signal is 3.3V, produce the function selecting control signal level of 7V;
When the first level monitoring signal and the second level monitoring signal are 0V, produce the function selecting control signal level of 12V.
9. SCART function selecting switch-over control signal processing method according to claim 6 is characterized in that, also comprises step:
S4) whether host CPU is monitored VCR SCART function selecting control signal automatically and is existed, and according to the output of monitoring result control TV signal.
10. SCART function selecting switch-over control signal processing method according to claim 9 is characterized in that,
When host CPU monitored VCR SCART function selecting control signal, host CPU stopped the output of TV signal;
When host CPU did not monitor VCR SCART function selecting control signal, host CPU kept the TV signal to export TV SCART interface to.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101087675A CN101959003B (en) | 2009-07-16 | 2009-07-16 | SCART function selection switching control signal processing circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101087675A CN101959003B (en) | 2009-07-16 | 2009-07-16 | SCART function selection switching control signal processing circuit and method |
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| CN101959003A true CN101959003A (en) | 2011-01-26 |
| CN101959003B CN101959003B (en) | 2012-08-22 |
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| CN2009101087675A Expired - Fee Related CN101959003B (en) | 2009-07-16 | 2009-07-16 | SCART function selection switching control signal processing circuit and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098420A (en) * | 2011-02-24 | 2011-06-15 | 广州视源电子科技有限公司 | Video signal output circuit |
| CN104539990A (en) * | 2014-12-29 | 2015-04-22 | 深圳市九洲电器有限公司 | Set top box signal output control circuit and set top box |
| CN114706799A (en) * | 2022-03-30 | 2022-07-05 | 江苏肯立科技股份有限公司 | Low-delay monitoring device and method for 256 multiplied by 256 switching matrix |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2824466Y (en) * | 2005-10-19 | 2006-10-04 | 海信集团有限公司 | Level converting matching circuit and TV set with same |
| CN200962633Y (en) * | 2006-10-22 | 2007-10-17 | 青岛海信电器股份有限公司 | TV set with the SCART interface level recognition circuit |
-
2009
- 2009-07-16 CN CN2009101087675A patent/CN101959003B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098420A (en) * | 2011-02-24 | 2011-06-15 | 广州视源电子科技有限公司 | Video signal output circuit |
| CN104539990A (en) * | 2014-12-29 | 2015-04-22 | 深圳市九洲电器有限公司 | Set top box signal output control circuit and set top box |
| CN104539990B (en) * | 2014-12-29 | 2017-12-29 | 深圳市九洲电器有限公司 | Set-top box signal output control circuit and set top box |
| CN114706799A (en) * | 2022-03-30 | 2022-07-05 | 江苏肯立科技股份有限公司 | Low-delay monitoring device and method for 256 multiplied by 256 switching matrix |
| CN114706799B (en) * | 2022-03-30 | 2024-06-04 | 江苏肯立科技股份有限公司 | Low-delay monitoring device and method for 256×256 switching matrix |
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| CN101959003B (en) | 2012-08-22 |
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