CN1487731A - Portable video signal generator - Google Patents
Portable video signal generator Download PDFInfo
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- CN1487731A CN1487731A CNA031401732A CN03140173A CN1487731A CN 1487731 A CN1487731 A CN 1487731A CN A031401732 A CNA031401732 A CN A031401732A CN 03140173 A CN03140173 A CN 03140173A CN 1487731 A CN1487731 A CN 1487731A
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Abstract
The portable video signal generator includes power supply, microprocessor chip U8, D/A converter circuit and clock circuit connected to the microprocessor chip U8, the microprocessor chip U8 has software curd to produce video signal based on video protocol, the clock circuit provides the microprocessor chip with clock signal, the said clock signal ensures the completion of single period command of the microprocessor chip within 100 ns, and the digital level signal from the microprocessor chip is converted in the A/D converter circuit to generate video signal for maintenance and debugging. The present invention has low cost, small volume and high reliability with over 80% functions being completed via software, and is easy to carry about.
Description
Technical field
The present invention relates to a kind of signal generation apparatus, specifically, relate to a kind of portable video signal generation apparatus.
Background technology
At present, producing, research and development, detect, a lot of fields such as maintenance can be applied to flying-spot video generator, the implementation method of the flying-spot video generator of Chu Shouing is on the market: the IC by multiple function finishes complicated sequential logic control again through D/A conversion output through central cpu, the signal of this flying-spot video generator can arbitrarily be provided with parameter, but combination of circuits complexity, volume is big, its cost is up to thousand yuan even ten thousand yuan, be aimed at research and development more, detection range, maintenance personal or electrophile are hung back, so in current maintenance process, needs are transferred the survey occasion, can only be with nonstandard signal coarse adjustment row vertical linearity or simply take time and look into relevant audio frequency and video circuit firmly with dead method, do greatly reducing repair quality and efficient like this.
Summary of the invention
The objective of the invention is, relatively costliness and function singleness and a kind of technical scheme that propose big at present maintenance of equipment circuit complexity, volume.
For achieving the above object, the portable video signal generation apparatus that the present invention proposes, comprise power pack 1, it is characterized in that also comprising little process chip U8, D/A change-over circuit 2 and the clock circuit 3 that links to each other with little process chip U8, be solidified with the software that produces vision signal according to video protocols in described little process chip U8, described clock circuit 3 provides clock signal for little process chip U8, described clock signal guarantees that little process chip U8 one-cycle instruction finishes in hundred ns, the height digital signal level of described little process chip U8 output is through D/A change-over circuit 2 conversion back generation vision signals.
The software that solidifies in described little process chip (U8) can produce PAL grid signal, PAL cross and add frame signal, PAL black and white field signal, NTSC grid signal, NTSC cross and add frame signal, 6 kinds of video standard signals of NTSC black and white field signal.
Described D/A change-over circuit 2 comprises the 17 resistance R the 017, the 18 resistance R 018 and the 19 resistance R 019, one end of described the 17 resistance R 017 and the 18 resistance R 018 meets little process chip U8 respectively, the other end of the 17 resistance R 017, the 18 resistance R 018 and an end of the 19 resistance R 019 are connected, the other end ground connection of the 19 resistance R 019.
Described clock circuit 3 comprises the 8th capacitor C 008, the 9th capacitor C 009 and the second crystal oscillator X002, described the 8th capacitor C 008 links to each other with the two ends of the second crystal oscillator X002 respectively with the 9th capacitor C 009, the other end ground connection of the 8th capacitor C 008 and the 9th capacitor C 009, clock signal are imported the clock signal pin of little process chip U8 by the two ends of the second crystal oscillator X002.
Described portable video signal generation apparatus also comprises the commutation circuit 5 that links to each other with little process chip U8, and described commutation circuit 5 is used to switch the operating state of portable video signal generation apparatus, also is used for the kind of Switch Video signal.
Described portable video signal generation apparatus also comprises reset circuit 4, and described reset circuit 4 provides power-on reset signal for little process chip U8.
Described portable video signal generation apparatus also comprises emitter follower circuit 6 and the tenth capacitor C 010, and the vision signal that described D/A change-over circuit 2 produces exports the emission terminal to through emitter follower circuit 6, the tenth capacitor C 010.
Described portable video signal generation apparatus also comprises little process chip U1, the reset circuit 9, clock circuit 10 and the data read-write equipment 7 that link to each other with described little process chip U1, is used for data are carried out the programming of separating computer.Described little process chip U1 inside solidification has software, hand-reset when described reset circuit 9 makes little process chip U1 reset or make mistakes when start, described clock circuit 10 provides clock signal for little process chip U1, described data read-write equipment 7 comprises as data to be read the master slice U7 of usefulness and writes the sub-sheet U6 of usefulness as data, the clock signal of described master slice U7 and sub-sheet U6 comes from the clock line SCL1+2 of little process chip U1, the data wire of described master slice U7 links to each other with the pin SDA1 of little process chip U1, the data wire of described sub-sheet U6 links to each other with the pin SDA2 of little process chip U1, described master slice U7 and sub-sheet U6 carry out reading of data by the software-driven that is solidificated among little process chip U1, write and verification, described commutation circuit 5 also links to each other with little process chip U1, is used for the model of switchable memory.
Described portable video signal generation apparatus also comprises data storage device 8, described data storage device 8 is driven by the solidification software that is solidificated among little process chip U1, carrying out the junior unit piecemeal by 7 pairs of Large Volume Datas of data read-write equipment stores repeatedly at random and calls, data can not lost after the power down, described commutation circuit 5 also is used for determining the initial address of memory address number and definite visit data storage device 8, and described data storage device 8 comprises:
1) address latch U2, its 8 position datawire links to each other with the data/address bus data port P0 of little process chip U1, is used to latch the least-significant byte address signal of exporting on the data port of little process chip U1;
2) random asccess memory U4 is used for depositing the data that little process chip U1 reads from the particular home electrical storage temporarily, and the data wire 101-I08 of described random asccess memory U4 links to each other with the data port P0 of little process chip U1;
3) mass storage device U3, its least-significant byte address A0-A7 from address latch U2, most-significant byte address A8-A15 from the data port P2 of little process chip U1, described little process chip U1 will access among the described mass storage device U3 of data write-once of random asccess memory U4 or with the data among the described mass storage device U3 according to the driving of solidification software.
Described portable video signal generation apparatus also comprises infrared receiving terminal M001, the output of described infrared receiving terminal M001 links to each other with little process chip U1 by a current-limiting resistance R002, described infrared receiving terminal M001 with the infrared signal detection that receives after the input little process chip U1, described commutation circuit 5 also is used to select the model of decoding chip, and the high-low level width with the emission agreement regulation of wanting decoding chip that chooses behind the width of described little process chip U1 test input high-low level contrasts.
The invention has the beneficial effects as follows: 1) cooperate to use the little process chip of high speed by software-driven again, the cost that obtains vision signal is reduced greatly, and volume is little, easy to carry, the function owing to 80% is realized by software, makes the signal reliability height.2) have multinomial function to select, integration is good.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Description of drawings
Fig. 1 represents functional-block diagram of the present invention.
Fig. 2 represents the low-cost flow chart that produces vision signal of the present invention.
Fig. 3 represents concrete enforcement circuit diagram of the present invention.
Embodiment
A kind of embodiment of the present invention as shown in Figure 1, the operating principle of power pack 1 is that the 220V alternating current is the 9V alternating current through T001 isolation transformation, after C018, C019 filtering, become direct current 5V again by U5 (7805) voltage stabilizing, after C020, C021 filtering to whole instrument power supply (single 5V power supply).
Described portable video signal generation apparatus also comprises little process chip U8, D/A change-over circuit 2 and the clock circuit 3 that links to each other with little process chip U8, reset circuit 4 and commutation circuit 5, described clock circuit 3 provides clock signal for little process chip U8, described clock signal guarantees that little process chip U8 one-cycle instruction finishes in hundred ns, the height digital signal level of described little process chip U8 output is through D/A change-over circuit 2 conversion back generation vision signals.Little process chip U8 is the AT90S2313 of the cheap high-speed microprocessor AVR of a slice series, be solidified with in it and can produce PAL grid signal, PAL cross and add frame signal, PAL black and white field signal, NTSC grid signal, NTSC cross and add frame signal, 6 kinds of standard signals of NTSC black and white field signal usefulness for maintenance and debugging, signal output impedance: 75 Europe, amplitude: 1+/-0.2V, waveform is accurate, and antijamming capability is strong.D/A change-over circuit 2 comprises the 17 resistance R the 017, the 18 resistance R 018 and the 19 resistance R 019, one end of described the 17 resistance R 017 and the 18 resistance R 018 meets little process chip U8 respectively, the other end of the 17 resistance R 017, the 18 resistance R 018 and an end of the 19 resistance R 019 are connected, the other end ground connection of the 19 resistance R 019.Clock circuit 3 comprises the 8th capacitor C 008, the 9th capacitor C 009 and the second crystal oscillator X002, described the 8th capacitor C 008 links to each other with the two ends of the second crystal oscillator X002 respectively with the 9th capacitor C 009, the other end ground connection of the 4th capacitor C 008 and the 5th capacitor C 009, clock signal is imported the clock signal pin of little process chip U8 by the two ends of the second crystal oscillator X002, work clock is provided for little process chip U8, little process chip U8 is finished in hundred ns (nanosecond) at one-cycle instruction under the 10M crystal oscillator, satisfied the necessary condition of video signal generating.Reset circuit 4 comprises the 15 resistance R 015 and the 7th capacitor C 007 that is cascaded, another termination power of described the 15 resistance R 015, the other end ground connection of described the 7th capacitor C 007, reset signal inserts little process chip U8 by the 15 resistance R 015 and the 7th capacitor C 007 junction, and little process chip U8 automatic low level that powers on is resetted.Commutation circuit 5 comprises the 8th resistance R 008, the 9th resistance R 009 and second switch K002, one termination power of described the 8th resistance R 008, the other end and second switch K002, the 9th resistance R 009 order ground connection afterwards of connect, switching signal inserts little process chip U8 by the junction of the 8th resistance R 008 and second switch K002, commutation circuit 5 is used to switch the operating state of portable video signal generation apparatus, also is used for the kind of Switch Video signal.Emitter follower circuit 6 comprises the 20 resistance R the 020, the 21 resistance R 021 and the second triode Q002, one end of described the 20 resistance R 020 links to each other with the contact place of the 17 resistance R the 017, the 18 resistance R 018 and the 19 resistance R 019, the other end links to each other with the base stage of the second triode Q002, the collector electrode of the second triode Q002 connects power supply, ground connection after the emitter of the second triode Q002 is connected with the 21 resistance R 021, the emitter of described the tenth capacitor C 010 1 terminations second triode Q002, terminal is penetrated in other end sending and receiving.9 pin of little process chip U8,11 pin are by each signal video frequency agreement output height digital level, produce sync level (output of 9,11 bipods is low), blanking level (output of 9 pin is low, the output of 11 pin high) and the white level (output of 9,11 bipods is high) of vision signals through D/A change-over circuit 2, export through emitter follower circuit 6 and through electrochemical capacitor C010 coupling again.
Described portable video signal generation apparatus also comprises little process chip U1, the reset circuit 9, clock circuit 10 and the data read-write equipment 7 that link to each other with described little process chip U1, described commutation circuit 5 also links to each other with little process chip U1, is used for the model of switchable memory.Described little process chip U1 is AT89C52, and inside solidification has software.Described reset circuit 9 comprises the 6th capacitor C 006, the 6th resistance R 006, the 7th resistance R 007 and first K switch 001, described the 7th resistance R 007 1 ends link to each other with power supply, the other end first K switch 001 of connecting, described the 6th capacitor C 006 and the 7th resistance R 007 that is in series, first K switch, 001 back in parallel links to each other with an end of the 6th resistance R 006, the other end ground connection of the 6th resistance R 006, reset signal is by the 6th capacitor C 006, the common joint of first K switch 001 and the 6th resistance R 006 goes out to draw with little process chip U1 and links to each other, hand-reset when making little process chip U1 reset or make mistakes when start.Described clock circuit 10 comprises the 4th capacitor C 004, the 5th capacitor C 005 and the first crystal oscillator X001, described the 4th capacitor C 004 links to each other with the two ends of the first crystal oscillator X001 respectively with the 5th capacitor C 005, the other end ground connection of the 4th capacitor C 004 and the 5th capacitor C 005, clock signal is linked to each other with little process chip U1 respectively by the two ends of the first crystal oscillator X001, for little process chip U1 provides clock signal, making little process chip U1 fill order instruction time is 1ns.Described data read-write equipment 7 comprises as data to be read the master slice U7 of usefulness and writes the sub-sheet U6 of usefulness as data, the clock signal of described master slice U7 and sub-sheet U6 comes from the clock line SCL1+2 of little process chip U1, the data wire of described master slice U7 links to each other with the pin SDA1 of little process chip U1, the data wire of described sub-sheet U6 links to each other with the pin SDA2 of little process chip U1, for saving the IO mouth resource of U1, two I
2C bus common clock line SCL1+2, the bus control protocol also adopts software virtual control, and R011, R012, R013 are the pull-up resistor of bus, and R014 resistance plays protection master slice data and establishes, and promptly the master slice data under any circumstance all do not change; Whether little process chip U1 detects 10 pin during work low level (whether K002 presses), and the time that occurs according to low level processing execution/handoff functionality respectively, when carrying out programming, carries out I by SDA1 and SCL1+2 line and master slice earlier
2Initial data is obtained in the C communication, carries out communication by SDA2 and SCL1+2 and sub-sheet again data are write in the corresponding address unit, finishes up to the programming verification.
Described portable video signal generation apparatus also comprises data storage device 8, described data storage device 8 is driven by the solidification software that is solidificated among little process chip U1, carrying out the junior unit piecemeal by 7 pairs of Large Volume Datas of data read-write equipment stores repeatedly at random and calls, data can not lost after the power down, and described commutation circuit 5 also is used for determining the initial address of memory address number and definite visit data storage device 8.Described data storage device 8 comprises:
1) address latch U2, be 74LS373, its 8 position datawire links to each other with the data/address bus data port P0 of little process chip U1, be used to latch the least-significant byte address signal of exporting on the data port of little process chip U1, when little process chip U1 visits outside parallel storage spare, on the P0 data port, export the least-significant byte reference address earlier, exporting a trailing edge signal at 30 pin simultaneously is used for address latch is exported for 11 pin of address latch U2, little afterwards process chip U1 is again in output of P0 data port or input data, it is time-sharing multiplex P0 mouth, this is owing to the decision of little process chip U1 (AT89C52) self character, and the effect of address latch U2 just is to latch the address signal on the P0 mouth;
2) random asccess memory U4, be the 8KB of HM6 264 RAM at random, effect is that little process chip U1 reads the data in the master slice and deposits usefulness temporarily, little process chip U1 again by visit random asccess memory U4 with the disposable quick storage of data in mass storage device U3, the capacity of random asccess memory U4 determined A0-A12 totally 13 address wires need to connect (2
13=8K), can connect by directly corresponding IO mouth with little process chip U1, data wire (IO0-IO7) is connected to the P0 mouth of little process chip U1, sheet choosing (20) pin is by the 5 foot control systems of little process chip U1, read-write is also directly received 17 (reading) 16 (writing) pin of little process chip U1, this chip also has the effective sheet of a high level to select CS2 (26 pin) but Chang Xuan is connected to VCC by R005;
3) mass storage device U3, be the AT29C040A mass storage device, capacity is that 4Mbit is 512KB, promptly once can store the data in 512 24C08, the A0-A18 pin of mass storage device U3 is that address choice is used, wherein A0-A7 is from address latch U2, the most-significant byte address that A8-A15 provides from the P2 mouth of little process chip U1, because the little process chip U1 of single-chip microcomputer can only directly provide the address signal of 16 pin, the A16 of mass storage device U3, A17, the address wire of A18 can only be by other IO mouth control, for making full use of mcu resource, A16,12 of the multiplexing little process chip U1 of A17 pin, 14 pin, A18 connects 1 pin of little process chip U1, the read-write control signal of mass storage device U3 connects the read-write control of little process chip U1 respectively, and mouthful (17 read, 16 write), the chip selection signal of mass storage device U3 (22 pin) is connected to 4 pin of little process chip U1, and low level is effective.
Described portable video signal generation apparatus also comprises infrared receiving terminal M001, the output of described infrared receiving terminal M001 links to each other with little process chip U1 by a current-limiting resistance R002, described infrared receiving terminal M001 with the infrared signal detection that receives after the input little process chip U1, described commutation circuit 5 also is used to select the model of decoding chip, and the high-low level width with the emission agreement regulation of wanting decoding chip that chooses behind the width of described little process chip U1 test input high-low level contrasts.
Claims (10)
1. portable video signal generation apparatus, comprise power pack (1), it is characterized in that also comprising little process chip (U8), D/A change-over circuit (2) and the clock circuit (3) that links to each other with little process chip (U8), be solidified with the software that produces vision signal according to video protocols in described little process chip (U8), described clock circuit (3) provides clock signal for little process chip (U8), described clock signal guarantees that little process chip (U8) one-cycle instruction finishes in hundred ns, the height digital signal level of described little process chip (U8) output is through D/A change-over circuit (2) conversion back generation vision signal.
2. portable video signal generation apparatus as claimed in claim 1 is characterized in that: the software that solidifies in described little process chip (U8) can produce PAL grid signal, PAL cross and add frame signal, PAL black and white field signal, NTSC grid signal, NTSC cross and add frame signal, 6 kinds of video standard signals of NTSC black and white field signal.
3. portable video signal generation apparatus as claimed in claim 1, it is characterized in that: described D/A change-over circuit (2) comprises the 17 resistance (R017), the 18 resistance (R018) and the 19 resistance (R019), one end of described the 17 resistance (R017) and the 18 resistance (R018) connects little process chip (U8) respectively, the other end of the 17 resistance (R017), the 18 resistance (R018) and an end of the 19 resistance (R019) are connected, the other end ground connection of the 19 resistance (R019).
4. portable video signal generation apparatus as claimed in claim 1, it is characterized in that: described clock circuit (3) comprises the 8th electric capacity (C008), the 9th electric capacity (C009) and second crystal oscillator (X002), described the 8th electric capacity (C008) links to each other with the two ends of second crystal oscillator (X002) respectively with the 9th electric capacity (C009), the other end ground connection of the 8th electric capacity (C008) and the 9th electric capacity (C009), clock signal are imported the clock signal pin of little process chip (U8) by the two ends of second crystal oscillator (X002).
5. portable video signal generation apparatus as claimed in claim 1, it is characterized in that: described vision signal generating means also comprises the commutation circuit (5) that links to each other with little process chip (U8), described commutation circuit (5) is used to switch the operating state of portable video signal generation apparatus, also is used for the kind of Switch Video signal.
6. as claim 1 or 5 described portable video signal generation apparatus, it is characterized in that: also comprise the reset circuit (4) that links to each other with little process chip (U8), described reset circuit (4) provides power-on reset signal for little process chip (U8).
7. as claim 1 or 5 described portable video signal generation apparatus, it is characterized in that: also comprise emitter follower circuit (6) and the tenth electric capacity (C010), the vision signal that described D/A change-over circuit (2) produces exports the emission terminal to through emitter follower circuit (6), the tenth electric capacity (C010).
8. portable video signal generation apparatus as claimed in claim 1, it is characterized in that: also comprise little process chip (U1), the reset circuit (9) that links to each other with described little process chip (U1), clock circuit (10) and data read-write equipment (7), described little process chip (U1) inside solidification has software, hand-reset when described reset circuit (9) makes little process chip (U1) reset or make mistakes when start, described clock circuit (10) provides clock signal for little process chip (U1), described data read-write equipment (7) comprises as data to be read the master slice (U7) of usefulness and writes the sub-sheet (U6) of usefulness as data, the clock signal of described master slice (U7) and sub-sheet (U6) comes from the clock line (SCL1+2) of little process chip (U1), the data wire of described master slice (U7) links to each other with the pin (SDA1) of little process chip (U1), the data wire of described sub-sheet (U6) links to each other with the pin (SDA2) of little process chip (U1), described master slice (U7) and sub-sheet (U6) carry out reading of data by the software-driven that is solidificated in little process chip (U1), write and verification, described commutation circuit (5) also links to each other with little process chip (U1), is used for the model of switchable memory.
9. portable video signal generation apparatus as claimed in claim 8, it is characterized in that: also comprise data storage device (8), described data storage device (8) is by the software-driven that is solidificated in little process chip (U1), by data read-write equipment (7) Large Volume Data being carried out the junior unit piecemeal stores repeatedly at random and calls, data can not lost after the power down, described commutation circuit (5) also is used for determining the initial address of memory address number and definite visit data storage device (8), and described data storage device (8) comprising:
1) address latch (U2), its 8 position datawire links to each other with the data/address bus data port (P0) of little process chip (U1), is used to latch the least-significant byte address signal of exporting on the data port of little process chip (U1);
2) random asccess memory (U4) is used for depositing the data that little process chip (U1) is read from the particular home electrical storage temporarily, and the data wire (I01-I08) of described random asccess memory (U4) links to each other with the data port (P0) of little process chip (U1);
3) mass storage device (U3), its least-significant byte address (A0-A7) from address latch (U2), most-significant byte address (A8-A15) from the data port (P2) of little process chip (U1), described little process chip (U1) will access in the described mass storage device of data write-once (U3) of random asccess memory (U4) or with the data in the described mass storage device (U3) according to the driving of solidification software.
10. portable video signal generation apparatus as claimed in claim 8, it is characterized in that: also comprise infrared receiving terminal (M001), the output of described infrared receiving terminal (M001) links to each other with little process chip (U1) by a current-limiting resistance (R002), described infrared receiving terminal (M001) with the infrared signal detection that receives after the input little process chip (U1), described commutation circuit (5) also is used to select the model of decoding chip, and the high-low level width with the emission agreement regulation of wanting decoding chip that chooses behind the width of described little process chip (U1) test input high-low level contrasts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03140173 CN1229979C (en) | 2003-08-15 | 2003-08-15 | Portable video signal generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03140173 CN1229979C (en) | 2003-08-15 | 2003-08-15 | Portable video signal generator |
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| CN1487731A true CN1487731A (en) | 2004-04-07 |
| CN1229979C CN1229979C (en) | 2005-11-30 |
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| CN 03140173 Expired - Fee Related CN1229979C (en) | 2003-08-15 | 2003-08-15 | Portable video signal generator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418361C (en) * | 2005-06-13 | 2008-09-10 | 深圳创维－Rgb电子有限公司 | Radio video frequency bidirection switching device |
| CN107918443A (en) * | 2016-10-11 | 2018-04-17 | 深圳市中兴微电子技术有限公司 | A kind of signal creating method and device |
-
2003
- 2003-08-15 CN CN 03140173 patent/CN1229979C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418361C (en) * | 2005-06-13 | 2008-09-10 | 深圳创维－Rgb电子有限公司 | Radio video frequency bidirection switching device |
| CN107918443A (en) * | 2016-10-11 | 2018-04-17 | 深圳市中兴微电子技术有限公司 | A kind of signal creating method and device |
| WO2018068510A1 (en) * | 2016-10-11 | 2018-04-19 | 深圳市中兴微电子技术有限公司 | Method, device and storage medium for signal generation |
| CN107918443B (en) * | 2016-10-11 | 2020-04-24 | 深圳市中兴微电子技术有限公司 | Signal generation method and device |
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|---|---|
| CN1229979C (en) | 2005-11-30 |
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Granted publication date: 20051130 Termination date: 20120815 |