CN104469352A - Input signal state detecting circuit, signal converting system and playing device - Google Patents
Input signal state detecting circuit, signal converting system and playing device Download PDFInfo
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- CN104469352A CN104469352A CN201410764219.9A CN201410764219A CN104469352A CN 104469352 A CN104469352 A CN 104469352A CN 201410764219 A CN201410764219 A CN 201410764219A CN 104469352 A CN104469352 A CN 104469352A
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Abstract
The invention discloses an input signal state detecting circuit. The input signal state detecting circuit comprises a first capacitor, a first power supply circuit and an RC discharging circuit, wherein the first capacitor is connected with a signal converting system, the control end of the first power supply circuit is connected with a second end of the first capacitor, the input end of the first power supply circuit is connected with an input power source, the RC discharging circuit is connected with the output end of the power supply circuit, and the common end of the RC discharging circuit and the power supply circuit serves as the output end of the input signal state detecting circuit. When an input signal of the signal converting system keeps normal jumping, the first power supply circuit is connected according to the normal frequency, the voltage level of the common end of the RC discharging circuit and the first power supply circuit is kept as the first voltage level; when the input signal of the signal converting system jumps abnormally, the voltage level of the common end of the RC discharging circuit and the first power supply circuit produces a falling edge used for controlling outputting stopping of the signal converting system, and therefore it can be guaranteed that when a signal line is pulled and inserted, a device is turned on or off or is in a standby state, the signal converting system is stopped from outputting signals in time.
Description
Technical field
The application relates to signal detection technique field, more particularly, relates to a kind of status input signal testing circuit, signal translating system and playback equipment.
Background technology
When transmission video signal; line synchronizing signal, field sync signal, clock signal etc. can be there are, these signals in the process of Signal transmissions, always with video signal transmission; if input signal is lost or when occurring abnormal, synchronous and clock signal can disappear or slack-off usually.
Change in VGA system at HDMI/MHL, input signal HDMI/MHL carry out holding wire plug, facility switching machine or standby in, the VGA signal of converting system exports, can not detect that input signal disappears and closes output immediately, and cause display screen occurring the picture signal of the unrest not wishing to see and/or the noise of sound, make troubles to user.
Summary of the invention
In view of this, the application provides a kind of status input signal testing circuit, signal translating system and playback equipment to disappear to solve the input signal that signal translating system cannot be detected in prior art in time, and stops the problem of output in time.
To achieve these goals, the existing scheme proposed is as follows:
A kind of status input signal testing circuit, is applied in signal translating system, comprises:
The first electric capacity that first end is connected for obtaining line synchronizing signal, clock signal or field sync signal that described converting system exports with described signal translating system output;
The first power supply circuits that control end is connected with the second end of described first electric capacity, input is connected with input power;
The RC discharge circuit be connected with described power supply circuits output;
The common port of described RC discharge circuit and described power supply circuits is as the output of status input signal testing circuit;
Described first power supply circuits are used for when the line synchronizing signal got, clock signal or field sync signal are normal saltus step, described RC discharge circuit is charged normal, when the improper saltus step of line synchronizing signal, clock signal or field sync signal, to the improper charging of described RC discharge circuit, now the common port voltage position of described first power supply circuits and described RC discharge circuit declines, and status input signal testing circuit exports the trailing edge being used for control signal converting system and stopping exporting;
The charge normal speed of wherein said first power supply circuits to described RC discharge circuit is greater than the velocity of discharge of described RC discharge circuit, and abnormal electrical power speed is less than the velocity of discharge of described RC discharge circuit.
Preferably, in above-mentioned status input signal testing circuit, described first power supply circuits comprise:
The first diode that anode is connected with described first electric capacity second end, the negative electrode of described first diode is connected with input power;
The first switching tube that control end is connected with described first diode anode, input is connected with described first diode cathode;
The anode of described first diode is as the control end of described first power supply circuits, negative electrode as the input of described first power supply circuits, and the output of described first switching tube is as the output of described first power supply circuits.
Preferably, in above-mentioned status input signal testing circuit, described RC discharge circuit comprises:
One end is connected with described first power supply circuits output, the first resistance of one end ground connection;
With the second electric capacity of described first resistor coupled in parallel.
Preferably, in above-mentioned status input signal testing circuit, described RC discharge circuit comprises:
First end is connected with described first power supply circuits output, the second end is by the second resistance of the 3rd capacity earth;
The second diode that anode is connected with the common port of the 3rd resistance with described second resistance, negative electrode is connected with the first end of described second resistance.
Preferably, in above-mentioned status input signal testing circuit, comprising:
Described first switching tube is triode or metal-oxide-semiconductor.
A kind of status input signal testing circuit, is applied in signal translating system, comprises:
First end is connected with described signal translating system output the 4th electric capacity for obtaining line synchronizing signal, clock signal or field sync signal that described converting system exports;
Control end is connected with the second end of described ac coupling capacitor, the charge/discharge control circuit of output head grounding;
The RC circuit that first end is connected with input power, the second end is connected with the input of described charge/discharge control circuit;
The common port of described RC circuit and described charge/discharge control circuit is as the output of status input signal testing circuit;
Described charge/discharge control circuit be used for when the line synchronizing signal got, when clock signal or field sync signal normal saltus step time, control the regular picture of described RC circuit, when clock signal or the improper saltus step of field sync signal, control described RC circuit abnormal discharge, now, rise in the voltage position of the common port of described charge/discharge control circuit and described RC circuit, status input signal testing circuit exports the rising edge being used for control signal converting system and stopping exporting.
Preferably, in above-mentioned status input signal testing circuit, described charge/discharge control circuit comprises:
Control end is connected with the second end of described 4th electric capacity, the second switch pipe of output head grounding;
The 3rd diode that anode is connected with described second switch pipe output, negative electrode is connected with described second switch pipe control end.
Preferably, in above-mentioned status input signal testing circuit, described RC circuit comprises:
3rd resistance in parallel and the 5th electric capacity.
A kind of signal translating system, comprises signal converter, also comprises:
The processor that one end is connected with the serial communication interface of described signal converter, the other end is connected with the output of status input signal testing circuit disclosed in above-mentioned any one, described processor is for generating and exporting the control signal matched with the output signal of described status input signal testing circuit to described signal converter.
A kind of player, comprising:
An above-mentioned arbitrary disclosed signal translating system.
As can be seen from above-mentioned technical scheme, status input signal testing circuit disclosed in the present application, by when the input signal of described signal translating system keeps normal saltus step, described first power supply circuits are according to normal frequency conducting, described RC discharge circuit is charged normal, make the voltage position of described RC discharge circuit and described first power supply circuits common port remain on the first voltage position A always, when the improper saltus step of the input signal of described signal translating system, the discharge capacity of described RC discharge circuit is greater than charge volume, there is being used for the trailing edge that control signal converting system stops exporting in the voltage position of described RC discharge circuit and described first power supply circuits common port, thus can ensure when occurring holding wire plug, facility switching machine, or during the operation such as standby, timely stop signal converting system output signal.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The structure chart of Fig. 1 a kind of status input signal testing circuit disclosed in the embodiment of the present application;
The structure chart of Fig. 2 status input signal testing circuit disclosed in another embodiment of the application;
The structure chart of Fig. 3 status input signal testing circuit disclosed in the another embodiment of the application;
Fig. 4 is the structure chart of the application's status input signal testing circuit disclosed in an embodiment again;
Fig. 5 is the structure chart of the application's a kind of status input signal testing circuit disclosed in an embodiment again.
Embodiment
In order to solve in prior art carry out holding wire plug, facility switching machine or standby in, converting system can not detect that input signal disappears immediately, and cause display screen occurring the picture signal of the unrest not wishing to see and the problem of noise, this application discloses a kind of status input signal testing circuit, signal translating system and playback equipment.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The structure chart of Fig. 1 a kind of status input signal testing circuit disclosed in the embodiment of the present application.
See Fig. 1, disclosed in the embodiment of the present application, status input signal testing circuit comprises:
First end is connected with the output of described signal translating system 0 the first electric capacity C1 for obtaining line synchronizing signal, clock signal or field sync signal that described converting system 0 exports;
First power supply circuits 1 that second end is connected, input is connected with input power of control end and described first electric capacity C1;
The RC discharge circuit 2 be connected with described power supply circuits output;
The common port of described RC discharge circuit and described power supply circuits is as the output of status input signal testing circuit.
The normal saltus step of input signal (line synchronizing signal, field sync signal, clock signal or other signals) when working properly, control the first power supply circuits 1 pair of RC discharge circuit 2 by the first electric capacity C1 to charge normal (now charge frequency can be considered soon and charges always), make the voltage position of described RC discharge circuit 2 and the first power supply circuits 1 common port remain on the first voltage position A.When system occur holding wire plug, facility switching machine or the operation such as standby time, the improper saltus step of input signal of described signal translating system (stop saltus step or saltus step slack-off), make described power supply circuits be in improper conducting state (improper conducting state comprises the slack-off state of turn-on frequency and cut-off state), stop powering to RC discharge circuit or slack-off to RC discharge circuit charging rate.
In Fig. 1, described RC discharge circuit 2 keeps discharge condition always, and when the discharge capacity electricity in RC discharge circuit 2 is sufficient, the voltage position of described RC discharge circuit 2 and the first power supply circuits 1 common port remains on the first voltage position A.If do not charged in time, electric charge in discharge capacity is put into by discharge resistance and to a certain degree will makes, declining appears in the voltage position of described RC discharge circuit 2 and the first power supply circuits 1 common port, and the trailing edge now occurred is the control signal controlling described signal translating system and stop exporting.
In a particular application, by arranging the value of discharge capacity in described RC discharge circuit and discharge resistance, can make when described first power supply circuits are to described RC discharge circuit normal power supply, the charging rate of described RC discharge circuit is greater than the velocity of discharge of RC discharge circuit.
It is visible when disclosed in employing the above embodiments of the present application, status input signal testing circuit controls described signal translating system, when the input signal of described signal translating system keeps normal saltus step, described first power supply circuits are according to normal frequency conducting, described RC discharge circuit is charged normal, the velocity of discharge due to described RC discharge circuit is less than the charging rate of the first power supply circuits, therefore, the voltage position of described RC discharge circuit and described first power supply circuits common port remains on the first voltage position A always, when the improper saltus step of the input signal of described signal translating system, the discharge capacity of described RC discharge circuit is greater than charge volume, there is being used for the trailing edge that control signal converting system stops exporting in the voltage position of described RC discharge circuit and described first power supply circuits common port, thus can ensure when occurring holding wire plug, facility switching machine, or during the operation such as standby, timely stop signal converting system output signal.
The structure chart of Fig. 2 a kind of status input signal testing circuit disclosed in another embodiment of the application.
Be understandable that, the application is on the basis of above-described embodiment, and also disclose a kind of concrete structure of described first power supply circuits, see Fig. 2, disclosed in the above embodiments of the present application, the first power supply circuits specifically can comprise:
The first diode D1 that anode is connected with described first electric capacity C1 second end, the negative electrode of described first diode is connected with input power VCC;
The first switching tube Q1 that control end is connected with described first diode D1 anode, input is connected with described first diode D1 negative electrode;
The anode of described first diode D1 is as the control end of described first power supply circuits 1, negative electrode as the input of described first power supply circuits 1, and the output of described first switching tube Q1 is as the output of described first power supply circuits 1.
During the normal saltus step of input signal, described first switching tube Q1 is by described first electric capacity C1 voltage control, with certain frequency normally, control described input power to charge normal described RC discharge circuit, when the improper saltus step of described input signal, the turn-on frequency of described switching tube Q1 is slack-off or stop conducting, and RC discharge circuit only discharges and do not charge, the voltage position of described first charging circuit and described RC discharge circuit common port declines, and occurs trailing edge.
The structure chart of Fig. 3 a kind of status input signal testing circuit disclosed in another embodiment of the application.
Be understandable that, the application, on the basis of above-described embodiment, also discloses a kind of concrete structure of described RC discharge circuit, see Fig. 3,
Described RC discharge circuit 2 can comprise:
One end is connected with the output of described first power supply circuits 1, the first resistance R1 of one end ground connection;
The second electric capacity C2 in parallel with described first resistance R1.
During electric discharge, store in described second electric capacity C2 energy be discharged into ground by described first resistance R1.
Be understandable that, disclosed herein as well is the mechanism map of another kind of RC discharge circuit, see Fig. 4, comprising of described RC discharge circuit:
First end is connected with described first power supply circuits 1 output, the second end is by the second resistance R2 of the 3rd electric capacity C3 ground connection;
The second diode D2 that anode is connected with the common port of the 3rd electric capacity C3 with described second resistance R2, negative electrode is connected with the first end of described second resistance R2;
The pull down resistor R4 in parallel with described 3rd electric capacity C3.
When described 3rd electric capacity C3 discharges, discharging current flow into described signal translating system by the second diode D2, discharge into ground by pull down resistor R4 simultaneously, when described first power supply circuits abnormal electrical power, along with the electric discharge of described 3rd electric capacity C3,, there is trailing edge in the voltage position of described first power supply circuits and described RC discharge circuit common port.
Be understandable that, disclosed in the above embodiments of the present application, described first switching tube Q1 can be triode or metal-oxide-semiconductor, when described first switching tube is triode, the input of described first switching tube is emitter, control end is base stage, output is collector electrode, when described first switching tube is metal-oxide-semiconductor, described control end is grid, output is drain electrode, input is source electrode.
In addition, apply the principle similar to status input signal observation circuit disclosed in above-described embodiment, see Fig. 5, the application again discloses a kind of status input signal testing circuit, is applied in signal translating system, comprises:
The 4th electric capacity C4 that first end is connected for obtaining line synchronizing signal, clock signal or field sync signal that described converting system 0 exports with described signal translating system 0 output;
Control end is connected with second end of described 4th electric capacity C4, the charge/discharge control circuit 3 of output head grounding;
The RC circuit 4 that first end is connected with input power VCC, the second end is connected with the input of described charge/discharge control circuit 3;
The common port of described RC circuit 4 and described charge/discharge control circuit 3 is as the output of status input signal testing circuit;
Described charge/discharge control circuit 3 is for working as the line synchronizing signal got, when clock signal or the normal saltus step of field sync signal, described charge/discharge control circuit 3 is with the frequency conducting identical with the frequency of described saltus step, control the regular picture of described RC circuit 4, now described RC circuit 4 and the voltage position of described charge/discharge control circuit 3 common port can be considered ground terminal voltage, when clock signal or the improper saltus step of field sync signal, elongated or even the not conducting of described charge/discharge control circuit 3 turn-on cycle, make described RC circuit 3 abnormal discharge, now, along with the turn-on cycle of described charge/discharge control circuit 3 is elongated, constantly rise in the voltage position of the common port of described charge/discharge control circuit 3 and described RC circuit 4, status input signal testing circuit exports the rising edge being used for control signal converting system and stopping exporting.
See Fig. 5, disclosed in the above embodiments of the present application, described charge/discharge control circuit 3 can comprise:
Control end is connected with second end of described 4th electric capacity C4, the second switch pipe Q2 of output head grounding, and described second switch pipe Q2 can be metal-oxide-semiconductor or triode;
The 3rd diode D3 that anode is connected with described second switch pipe Q2 output, negative electrode is connected with described second switch pipe Q2 control end.
Described RC circuit comprises:
3rd resistance R3 in parallel and the 5th electric capacity C5.
Be understandable that, corresponding with the observation circuit of status input signal disclosed in above-described embodiment, disclosed herein as well is a kind of signal translating system, comprise signal converter, also comprise:
One end is connected with the serial communication interface of described signal converter, the processor that the other end is connected with the output of the above-mentioned arbitrary disclosed status input signal testing circuit of the application, described processor is for generating and exporting the control signal matched with the output signal of described status input signal testing circuit to described signal converter, for controlling the break-make of described signal processor, when described status input signal observation circuit is the arbitrary disclosed status input signal observation circuit of Fig. 1-4, when detecting that trailing edge appears in the voltage position of described first power supply circuits and described RC discharge circuit common port, export the control signal stopping exporting for controlling described signal converter, when described status input signal observation circuit is for status input signal observation circuit shown in Fig. 5, when there is rising edge in the voltage position of the common port described RC circuit and described charge/discharge control circuit being detected, export the control signal stopping exporting for controlling described signal converter.
Be understandable that, corresponding to signal translating system disclosed in the above embodiments of the present application, disclosed herein as well is a kind of player applying the application's any signal converter above-mentioned, described player can be the playback equipment that the section such as mobile phone, TV plays voice and/or video.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a status input signal testing circuit, is characterized in that, is applied in signal translating system, comprises:
The first electric capacity that first end is connected for obtaining line synchronizing signal, clock signal or field sync signal that described converting system exports with described signal translating system output;
The first power supply circuits that control end is connected with the second end of described first electric capacity, input is connected with input power;
The RC discharge circuit be connected with described power supply circuits output;
The common port of described RC discharge circuit and described power supply circuits is as the output of status input signal testing circuit;
Described first power supply circuits are used for when the line synchronizing signal got, clock signal or field sync signal are normal saltus step, described RC discharge circuit is charged normal, when the improper saltus step of line synchronizing signal, clock signal or field sync signal, to the improper charging of described RC discharge circuit, now the common port voltage position of described first power supply circuits and described RC discharge circuit declines, and status input signal testing circuit exports the trailing edge being used for control signal converting system and stopping exporting;
The charge normal speed of wherein said first power supply circuits to described RC discharge circuit is greater than the velocity of discharge of described RC discharge circuit, and abnormal electrical power speed is less than the velocity of discharge of described RC discharge circuit.
2. status input signal testing circuit according to claim 1, is characterized in that, described first power supply circuits comprise:
The first diode that anode is connected with described first electric capacity second end, the negative electrode of described first diode is connected with input power;
The first switching tube that control end is connected with described first diode anode, input is connected with described first diode cathode;
The anode of described first diode is as the control end of described first power supply circuits, negative electrode as the input of described first power supply circuits, and the output of described first switching tube is as the output of described first power supply circuits.
3. status input signal testing circuit according to claim 1, is characterized in that, described RC discharge circuit comprises:
One end is connected with described first power supply circuits output, the first resistance of one end ground connection;
With the second electric capacity of described first resistor coupled in parallel.
4. status input signal testing circuit according to claim 1, is characterized in that, described RC discharge circuit comprises:
First end is connected with described first power supply circuits output, the second end is by the second resistance of the 3rd capacity earth;
The second diode that anode is connected with the common port of the 3rd resistance with described second resistance, negative electrode is connected with the first end of described second resistance.
5. status input signal testing circuit according to claim 2, is characterized in that, comprising:
Described first switching tube is triode or metal-oxide-semiconductor.
6. a status input signal testing circuit, is characterized in that, is applied in signal translating system, comprises:
First end is connected with described signal translating system output the 4th electric capacity for obtaining line synchronizing signal, clock signal or field sync signal that described converting system exports;
Control end is connected with the second end of described ac coupling capacitor, the charge/discharge control circuit of output head grounding;
The RC circuit that first end is connected with input power, the second end is connected with the input of described charge/discharge control circuit;
The common port of described RC circuit and described charge/discharge control circuit is as the output of status input signal testing circuit;
Described charge/discharge control circuit be used for when the line synchronizing signal got, when clock signal or field sync signal normal saltus step time, control the regular picture of described RC circuit, when clock signal or the improper saltus step of field sync signal, control described RC circuit abnormal discharge, now, rise in the voltage position of the common port of described charge/discharge control circuit and described RC circuit, status input signal testing circuit exports the rising edge being used for control signal converting system and stopping exporting.
7. status input signal testing circuit according to claim 6, is characterized in that, described charge/discharge control circuit comprises:
Control end is connected with the second end of described 4th electric capacity, the second switch pipe of output head grounding;
The 3rd diode that anode is connected with described second switch pipe output, negative electrode is connected with described second switch pipe control end.
8. status input signal testing circuit according to claim 6, is characterized in that, described RC circuit comprises:
3rd resistance in parallel and the 5th electric capacity.
9. a signal translating system, comprises signal converter, it is characterized in that, also comprises:
The processor that one end is connected with the serial communication interface of described signal converter, the other end is connected with the output of status input signal testing circuit disclosed in claim 1-8 any one, described processor is for generating and exporting the control signal matched with the output signal of described status input signal testing circuit to described signal converter.
10. a player, is characterized in that, comprising:
Signal translating system according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410764219.9A CN104469352B (en) | 2014-12-12 | 2014-12-12 | A kind of status input signal detection circuit, signal translating system and playback equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410764219.9A CN104469352B (en) | 2014-12-12 | 2014-12-12 | A kind of status input signal detection circuit, signal translating system and playback equipment |
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| CN104469352A true CN104469352A (en) | 2015-03-25 |
| CN104469352B CN104469352B (en) | 2017-08-11 |
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| US5818538A (en) * | 1995-07-27 | 1998-10-06 | Lg Semicon Co., Ltd. | Sync on green signal separating circuit of an image output apparatus |
| CN200973134Y (en) * | 2006-11-21 | 2007-11-07 | 青岛海信电器股份有限公司 | Line failure protection circuit |
| CN101583048A (en) * | 2009-06-12 | 2009-11-18 | 深圳创维－Rgb电子有限公司 | Signal detection device of VGA channel |
| CN201440611U (en) * | 2009-07-20 | 2010-04-21 | 惠州市蓝微电子有限公司 | Driving circuit for charge switch of battery charger |
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2014
- 2014-12-12 CN CN201410764219.9A patent/CN104469352B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5818538A (en) * | 1995-07-27 | 1998-10-06 | Lg Semicon Co., Ltd. | Sync on green signal separating circuit of an image output apparatus |
| CN200973134Y (en) * | 2006-11-21 | 2007-11-07 | 青岛海信电器股份有限公司 | Line failure protection circuit |
| CN101583048A (en) * | 2009-06-12 | 2009-11-18 | 深圳创维－Rgb电子有限公司 | Signal detection device of VGA channel |
| CN201440611U (en) * | 2009-07-20 | 2010-04-21 | 惠州市蓝微电子有限公司 | Driving circuit for charge switch of battery charger |
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