CN100418361C - Radio video frequency bidirection switching device - Google Patents
Radio video frequency bidirection switching device Download PDFInfo
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- CN100418361C CN100418361C CNB2005100211037A CN200510021103A CN100418361C CN 100418361 C CN100418361 C CN 100418361C CN B2005100211037 A CNB2005100211037 A CN B2005100211037A CN 200510021103 A CN200510021103 A CN 200510021103A CN 100418361 C CN100418361 C CN 100418361C
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Abstract
The present invention discloses a radio and audio frequency conversion device which comprises a radio frequency reception circuit, a central processing unit, a radio and audio frequency conversion circuit and an audio frequency output circuit, wherein after the radio frequency reception circuit receives a radio frequency signal, the radio frequency signal is output to the central processing unit which outputs a processing instruction to the radio and audio frequency conversion circuit, the radio and audio frequency conversion circuit processes and outputs the received signal to the audio frequency output circuit, and the audio frequency circuit outputs an audio frequency signal to a user. The present invention also discloses a radio and audio frequency conversion device and has the advantages that an expensive signal generator in the production and debugging of a television can be replaced by conversing the radio frequency signal to the audio frequency signal, and a central signal system used in the production of the television can be replaced by conversing the audio frequency signal to the radio frequency signal. The present invention can also be widely used in the after-sale service of the television, and the failure of the class of audio frequency and radio frequency is quickly looked up. The present invention both reduces the production cost of the television and lowers the maintenance and service cost of the television.
Description
Technical field
The present invention relates to conversion equipment, relate in particular to the radio frequency of television set and the radio video frequency bidirection switching device of video field.
Background technology
Television set has entered thousands upon thousands average families, becomes product the most general in the consumer electronics.The TV RF signals national standard standard of China adopts PAL D/K standard, and the employing NTSC-M standard that the employing PALD/K standard that video signal sources such as VCD, DVD have has, this has brought great inconvenience for the debugging and the check of television set manufacturing enterprise:
Can't enter factory's debugging mode when 1. being in the AV state, must use signal generator (PM5518) to send the NTSC-M standard signal, increase the input of company's fixed assets greatly so adjust the station of NTSC-M standard row vertical linearity because of television set;
2. a plurality of AV debugging on the production line all need to use signal generator (PM5518) or DVD player to convert radiofrequency signal to vision signal with testing station, to debug or to check;
3. medium-sized and small enterprises even subplate process unit also must drop into millions of funds and be used for buying the central signal system, convert vision signal to radiofrequency signal, with convenient test.
In sum, present TV manufacturing enterprise all needs to drop into a large amount of funds and is used to purchase debugging and testing instruments, has increased the production cost of television set greatly.
Summary of the invention
Main purpose of the present invention is to provide a kind of radio video frequency bidirection switching device, and it has solved can't enter the problem that factory's debugging mode is modulated in the prior art when television set is in the AV state.
In order to solve the problems of the technologies described above, the technical solution used in the present invention comprises a kind of radio video frequency bidirection switching device that is used for television set production debugging, and described radio video frequency bidirection switching device comprises radio-frequency (RF) receiving circuit (11), CPU (12), penetrates video conversion circuit (13) and video output circuit (14); Also comprise video reception circuit (21), look radio frequency change-over circuit (23) and rf output circuit (24); Radio-frequency (RF) receiving circuit (11) receives after the radiofrequency signal to export to through CPU (12) penetrates video conversion circuit (13), described CPU (12) is according to tuned frequency and the band information set, control is penetrated video conversion circuit (13) and is demodulated and the tuned frequency of this setting and the vision signal of corresponding pal mode of band information or TSC-system formula, and exports to described video reception circuit (21) by described video output circuit (14); Described video reception circuit (21) receives described vision signal and exports the described radio frequency change-over circuit (23) of looking to through CPU (12), described CPU (12) is according to image and the sound accompaniment modulated carrier data set, control the described radio frequency change-over circuit (23) of looking described vision signal is modulated to image and sound accompaniment modulated carrier data corresponding radio frequency signal with this setting, and export to debugged television set by described rf output circuit (24).
Radio video frequency bidirection switching device of the present invention, also comprise video generation circuit (25) and select circuit (26), the vision signal of described video reception circuit (21) and described video generation circuit (25) output exports the described radio frequency change-over circuit (23) of looking to by described selection circuit (26) and through described CPU (12), and described video reception circuit (21) can be set described selection circuit (26) or video generation circuit (25) enjoys priority.
Adopt technique scheme, in conjunction with the following embodiment that will describe in detail, beneficial effect of the present invention is: the present invention is by converting the NTSC radiofrequency signal to vision signal, and then be transformed on the PAL RF spot, the signal generator that can replace the costliness in the TV production debugging has been saved the production cost of television set; Can replace the central signal system that uses in the TV production by vision signal being converted to radiofrequency signal, also can be widely used in the television set after-sale service, search audio frequency and video, radio frequency class fault fast, make things convenient for after-sales-service engineer; Both reduce the production cost of television set, reduced the television maintenance cost of serving again.
The present invention also comprises following improvement:
Described CPU comprises single-chip microcomputer and memory, and single-chip microcomputer is connected with memory, and described circuit structure is simple, reliability is high, is easy to realize.
The described video conversion circuit of penetrating is the frequency integral high frequency head, and the frequency integral high frequency head connects CPU and video output circuit, and the frequency integral high frequency head can convert radiofrequency signal to vision signal easily.
Described selection circuit is the RCA terminal of band mechanical switch, and it is simple in structure, can conveniently select to send the circuit of signal.
Described selection circuit is an electronic switch, and it is simple in structure, can conveniently select to send the circuit of signal.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 represents that the present invention penetrates the structured flowchart of video change-over device;
Fig. 2 represents that the present invention looks the structured flowchart of radio frequency conversion equipment;
Fig. 3 represents that the present invention looks the structured flowchart of the another kind of execution mode of radio frequency conversion equipment;
Fig. 4 represents that the present invention looks the structured flowchart of another execution mode of radio frequency conversion equipment.
Fig. 5 represents the physical circuit figure of radio video frequency bidirection switching device of the present invention.
[embodiment]
Be illustrated in figure 1 as the structured flowchart that the present invention penetrates video change-over device, radio-frequency (RF) receiving circuit 11 is exported to CPU 12 after receiving radiofrequency signal, CPU 12 output processing instructions are given and are penetrated video conversion circuit 13, video output circuit 14 is handled and exported to the described video conversion circuit 13 of penetrating to the received signal, and described video output circuit 14 outputting video signals are given the user.Be illustrated in figure 5 as the concrete enforcement circuit diagram of radio video frequency bidirection switching device of the present invention, wherein 51 is power unit: the 220V AC power is through the two 15V alternating currents of isolating transformer T1 output, one the tunnel through rectifier bridge heap RB1 bridge rectifier, capacitor C 1, capacitor C 2 filtering, by diode D2 (figure do not show) voltage stabilizing to 33V, to offer frequency integral high frequency head U6 and integrated rf modulations module U8; Another road is through diode D1, capacitor C 3 rectifying and wave-filterings, and regulator block U1, regulator block U2 voltage stabilizing go out 9V, 5V direct current, and power unit 51 is exported 3 groups of voltages altogether.52 is CPU, and it comprises single-chip microcomputer U4 and memory U5.53 for penetrating video conversion circuit and video output circuit.Single-chip microcomputer U4 provides clock by oscillator X1, capacitor C 17, capacitor C 18, provides reset signal by capacitor C 16, resistance R 28.After the start, single-chip microcomputer U4 is with the internal memory that data are read in single-chip microcomputer U4 that is provided with before shutting down last time among the memory U5, data such as tuned frequency, band information, sound accompaniment standard are inputed to frequency integral high frequency head U6 by iic bus, whether 3 pin that detect vision signal row field synchronization separating chips U7 simultaneously have field sync signal, as do not have synchronizing signal, the output of frequency integral high frequency head U6 no signal is described; If any synchronizing signal, single-chip microcomputer U4 its frequency of test earlier is 50HZ or 60HZ, with the 12-14 pin video standard (PAL or NTSC) of decision control frequency integral high frequency head U6, detects the AFT pin of U6 simultaneously, to prevent frequency drift.Work as A, B point high-low level signal is input to the P2.2 of single-chip microcomputer U4, P2.3, single-chip microcomputer U4 judges that A is high, B is qualified when being low, the AFT pin voltage that is U6 is about 2.4V, as AB is other state, then single-chip microcomputer U4 makes it be in best audio-visual output state by the adjust frequency Frequency point of integral high frequency head U6 of IIC, the vision signal that frequency integral high frequency head U6 demodulates is isolated coupling output by triode Q2, audio signal is isolated coupling output by triode Q3, the LCD screen of U3 shows the frequency, demodulation frequency point of this moment, image and sound accompaniment standard, as the need adjustment, can realize operations such as automatic channel search and the change of sound accompaniment standard by K2, process and principle and last same are when no signal or swinging of signal timing, the flicker of LED1 indicator light, LED1 Chang Liang during signal stabilization.
Be illustrated in figure 2 as the structured flowchart that the present invention looks the radio frequency conversion equipment, video reception circuit 21 is exported to CPU 12 after receiving vision signal, CPU 12 output processing instructions are given and are looked radio frequency change-over circuit 23, rf output circuit 24 is handled and exported to the described radio frequency change-over circuit 23 of looking to the received signal, and described rf output circuit 24 output radiofrequency signals are given the user.Be illustrated in figure 5 as its concrete circuit diagram of implementing, wherein 51 is power unit: the 220V AC power is through the two 15V alternating currents of isolating transformer T1 output, one the tunnel through rectifier bridge heap RB1 bridge rectifier, capacitor C 1, capacitor C 2 filtering, by diode D2 voltage stabilizing to 33V, so that frequency integral high frequency head U6 and integrated rf modulations module U8 power supply to be provided; Another road is through diode D1, capacitor C 3 rectifying and wave-filterings, and regulator block U1, regulator block U2 voltage stabilizing go out 9V, 5V direct current, and power unit 51 is exported 3 groups of voltages altogether.52 is CPU, and it comprises single-chip microcomputer U4 and memory U5.54 for looking radio frequency change-over circuit and rf output circuit.After the start, image and sound accompaniment modulated carrier data that single-chip microcomputer U4 will be stored in memory U5 input to integrated rf modulations module U8 by iic bus with data, if this moment, 6,5 bipods of integrated rf modulations module U8 had the picture-and-sound signal, then can export the radiofrequency signal of the carrier frequency of single-chip microcomputer U4 control.Wherein 6,5 bipod signals source is: the RCA terminal as the outside input does not connect signal, then the terminal switch is received video, the audio signal of frequency integral high frequency head U6 demodulation output automatically, connected the then preferential modulated external signal of external video, audio signal as terminal, and the video/audio signal of automatic disconnection frequency integral high frequency head U6 output; Also can send vision signal by single-chip microcomputer U4 inside.Modulating frequency point, image and sound accompaniment standard that the U3LCD screen shows this moment as the need adjustment, can realize the operations such as change of vision carrier frequency point and sound accompaniment modulation system by K1.
Be illustrated in figure 3 as the structured flowchart that the present invention looks another execution mode of radio frequency conversion equipment, video generation circuit 25 is exported to CPU 12 after sending vision signal, CPU 12 output processing instructions are given and are looked radio frequency change-over circuit 23, rf output circuit 24 is handled and exported to the described radio frequency change-over circuit 23 of looking to the received signal, and described rf output circuit 24 output radiofrequency signals are given the user; This is looked, and vision signal is produced by CPU 12 inside in the radio frequency conversion equipment.Be illustrated in figure 5 as its concrete circuit diagram of implementing, wherein 51 is power unit: the 220V AC power is through the two 15V alternating currents of isolating transformer T1 output, one the tunnel through rectifier bridge heap RB1 bridge rectifier, capacitor C 1, capacitor C 2 filtering, by diode D2 voltage stabilizing to 33V, so that frequency integral high frequency head U6, integrated rf modulations module U8 power supply to be provided; Another road is through diode D1, capacitor C 3 rectifying and wave-filterings, and regulator block U1, regulator block U2 voltage stabilizing go out 9V, 5V direct current, and power unit 51 is exported 3 groups of voltages altogether.52 is CPU, and it comprises single-chip microcomputer U4 and memory U5.54 for looking radio frequency change-over circuit and rf output circuit.After the start, image and sound accompaniment modulated carrier data that single-chip microcomputer U4 will be stored in memory U5 input to integrated rf modulations module U8 by IIC with data, 6,5 bipods of this moment as integrated rf modulations module U8 have the picture-and-sound signal, then can export the radiofrequency signal of monolithic processor controlled carrier frequency, 6, the 5 bipod signals are here sent by single-chip microcomputer U4 in house software; Modulating frequency point, image and sound accompaniment standard that the U3LCD screen shows this moment as the need adjustment, can realize the operations such as change of vision carrier frequency point and sound accompaniment modulation system by K1.
Be illustrated in figure 4 as the structured flowchart that the present invention looks the another execution mode of radio frequency conversion equipment.Video generation circuit 25 or video reception circuit 21 output signal to selects circuit 26, CPU 12 is selected video generation circuit 25 or video reception circuit 21 by selecting circuit 26, CPU 12 output processing instructions are given and are looked radio frequency change-over circuit 23, rf output circuit 24 is handled and exported to the described radio frequency change-over circuit 23 of looking to the received signal, and described rf output circuit 24 output radiofrequency signals are given the user; Vision signal can also can be imported by the outside by inner generation of circuit in this device.Selecting circuit 26 can be the RCA terminal of band mechanical switch, when promptly the insertion of audio frequency terminal line will be looked as DVD in the outside, a shell fragment of terminal just disconnects with the video/audio signal that internal frequency integral high frequency head U6 demodulates, and connect with the outside, if there are 3 road video/audio signals to need modulation, just switch to realize with electronic switch.Be illustrated in figure 5 as its concrete circuit diagram of implementing, wherein 51 is power unit: the 220V AC power is through the two 15V alternating currents of isolating transformer T1 output, one the tunnel through the RB1 bridge rectifier, capacitor C 1, capacitor C 2 filtering, by diode D2 voltage stabilizing to 33V, so that frequency integral high frequency head U6, integrated rf modulations module U8 power supply to be provided; Another road is through diode D1, capacitor C 3 rectifying and wave-filterings, and regulator block U1, regulator block U2 voltage stabilizing go out 9V, 5V ' direct current, and power unit 51 is exported 3 groups of voltages altogether.52 is CPU, and it comprises single-chip microcomputer U4 and memory U5.54 for looking radio frequency change-over circuit and rf output circuit.After the start, image and sound accompaniment modulated carrier data that single-chip microcomputer U4 will be stored in memory U5 input to integrated rf modulations module U8 by IIC with data, 6,5 bipods of this moment as integrated rf modulations module U8 have the picture-and-sound signal, then can export the radiofrequency signal of the carrier frequency of single-chip microcomputer U4 control, 6, the 5 bipod signals source here has 3 kinds: the video/audio signal of the RCA terminal of outside input, frequency integral high frequency head U6 demodulation output and the video/audio signal that single-chip microcomputer U4 in house software sends; Modulating frequency point, image and sound accompaniment standard that the U3LCD screen shows this moment as the need adjustment, can realize the operations such as change of vision carrier frequency point and sound accompaniment modulation system by K1.
Claims (6)
1. one kind is used for the radio video frequency bidirection switching device that television set production is debugged, and it is characterized in that: described radio video frequency bidirection switching device comprises radio-frequency (RF) receiving circuit (11), CPU (12), penetrates video conversion circuit (13) and video output circuit (14); Also comprise video reception circuit (21), look radio frequency change-over circuit (23) and rf output circuit (24); Radio-frequency (RF) receiving circuit (11) receives after the radiofrequency signal to export to through CPU (12) penetrates video conversion circuit (13), described CPU (12) is according to tuned frequency and the band information set, control is penetrated video conversion circuit (13) and is demodulated and the tuned frequency of this setting and the vision signal of corresponding pal mode of band information or TSC-system formula, and exports to described video reception circuit (21) by described video output circuit (14); Described video reception circuit (21) receives described vision signal and exports the described radio frequency change-over circuit (23) of looking to through CPU (12), described CPU (12) is according to image and the sound accompaniment modulated carrier data set, control the described radio frequency change-over circuit (23) of looking described vision signal is modulated to image and sound accompaniment modulated carrier data corresponding radio frequency signal with this setting, and export to debugged television set by described rf output circuit (24); Also comprise video generation circuit (25) and select circuit (26), the vision signal of described video reception circuit (21) and described video generation circuit (25) output exports the described radio frequency change-over circuit (23) of looking to by described selection circuit (26) and through described CPU (12), and described video reception circuit (21) can be set described selection circuit (26) or video generation circuit (25) enjoys priority.
2. radio video frequency bidirection switching device according to claim 1 is characterized in that: described CPU (12) comprises single-chip microcomputer (U4) and memory (U5), and single-chip microcomputer (U4) is connected with memory (U5).
3. radio video frequency bidirection switching device according to claim 1, it is characterized in that: the described video conversion circuit (13) of penetrating is a frequency integral high frequency head (U6), and frequency integral high frequency head (U6) connects CPU (12) and video output circuit (14).
4. radio video frequency bidirection switching device according to claim 1, it is characterized in that: the described integrated rf modulations module of radio frequency change-over circuit (23) (U8) of looking, integrated rf modulations module (U8) connects CPU (12) and rf output circuit (24).
5. radio video frequency bidirection switching device according to claim 1 is characterized in that: described selection circuit (26) is the RCA terminal of band mechanical switch.
6. radio video frequency bidirection switching device according to claim 1 is characterized in that: described selection circuit (26) is an electronic switch.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100211037A CN100418361C (en) | 2005-06-13 | 2005-06-13 | Radio video frequency bidirection switching device |
| HK06108748.2A HK1086700A1 (en) | 2005-06-13 | 2006-08-07 | A fm-video and video-fm transforming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100211037A CN100418361C (en) | 2005-06-13 | 2005-06-13 | Radio video frequency bidirection switching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1753468A CN1753468A (en) | 2006-03-29 |
| CN100418361C true CN100418361C (en) | 2008-09-10 |
Family
ID=36680128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100211037A Expired - Fee Related CN100418361C (en) | 2005-06-13 | 2005-06-13 | Radio video frequency bidirection switching device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100418361C (en) |
| HK (1) | HK1086700A1 (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85200982U (en) * | 1985-04-22 | 1986-06-04 | 任翼龙 | Simple pal (or ntsc) rainbow signal generator |
| CN88200764U (en) * | 1988-01-22 | 1988-09-21 | 刘健敏 | Vidio / radio frequency converter |
| CN1039165A (en) * | 1988-07-02 | 1990-01-24 | 德国Itt工业股份有限公司 | Frequency conversion circuit for color tv channel |
| CN2181029Y (en) * | 1994-03-22 | 1994-10-26 | 王宇鹏 | TV/computer two-purpose display disc |
| CN1131855A (en) * | 1994-11-30 | 1996-09-25 | 三星电子株式会社 | Multi-broadcast channel selection apparatus |
| CN1135137A (en) * | 1995-01-04 | 1996-11-06 | 船井电机株式会社 | Circuit device including RF converter, Tuner and IF amplifier |
| CN1487731A (en) * | 2003-08-15 | 2004-04-07 | 深圳创维－Rgb电子有限公司 | Portable video signal generator |
| CN2737103Y (en) * | 2004-10-27 | 2005-10-26 | 上海富邦信息技术有限公司 | Micro-power audio/video transmitter |
-
2005
- 2005-06-13 CN CNB2005100211037A patent/CN100418361C/en not_active Expired - Fee Related
-
2006
- 2006-08-07 HK HK06108748.2A patent/HK1086700A1/en not_active IP Right Cessation
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85200982U (en) * | 1985-04-22 | 1986-06-04 | 任翼龙 | Simple pal (or ntsc) rainbow signal generator |
| CN88200764U (en) * | 1988-01-22 | 1988-09-21 | 刘健敏 | Vidio / radio frequency converter |
| CN1039165A (en) * | 1988-07-02 | 1990-01-24 | 德国Itt工业股份有限公司 | Frequency conversion circuit for color tv channel |
| CN2181029Y (en) * | 1994-03-22 | 1994-10-26 | 王宇鹏 | TV/computer two-purpose display disc |
| CN1131855A (en) * | 1994-11-30 | 1996-09-25 | 三星电子株式会社 | Multi-broadcast channel selection apparatus |
| CN1135137A (en) * | 1995-01-04 | 1996-11-06 | 船井电机株式会社 | Circuit device including RF converter, Tuner and IF amplifier |
| CN1487731A (en) * | 2003-08-15 | 2004-04-07 | 深圳创维－Rgb电子有限公司 | Portable video signal generator |
| CN2737103Y (en) * | 2004-10-27 | 2005-10-26 | 上海富邦信息技术有限公司 | Micro-power audio/video transmitter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1753468A (en) | 2006-03-29 |
| HK1086700A1 (en) | 2006-09-22 |
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