CN101599259B - System and method for combining composite signal and digital signal - Google Patents
System and method for combining composite signal and digital signal Download PDFInfo
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- CN101599259B CN101599259B CN2008100285833A CN200810028583A CN101599259B CN 101599259 B CN101599259 B CN 101599259B CN 2008100285833 A CN2008100285833 A CN 2008100285833A CN 200810028583 A CN200810028583 A CN 200810028583A CN 101599259 B CN101599259 B CN 101599259B
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Abstract
The invention discloses a system and a method for combining a composite signal and a digital signal, which are suitable for a display device. The method comprises the following steps: firstly, receiving a composite signal and a digital signal; converting the digital signal into serial bit data and strengthening the signal strength of the serial bit data, wherein when a synchronous signal of the composite signal is detected, the strengthened serial bit data and the composite signal are modulated one by one so as to output a modulated composite signal; then receiving the modulated composite signal, separating the serial bit data from the modulated composite signal and stacking the serial bit data, wherein when the number of the stacked serial bit data is beyond a threshold value, the stacked serial bit data is converted into parallel bit data; and finally transmitting the parallel bit data to the display device.
Description
[technical field]
The invention provides a kind of system and method,, and do not influence the technical field of the image data in the composite signal particularly relevant for a digital signal can being added in the composite signal in order to combining composite signal and digital signal.
[background technology]
The modern is more and more high for the requirement of display device (as LCD TV or plasma-screen television), thereupon, also make its colour vividness or image resolution be made better and better, even can also directly on display device, carry out image control or data presentation.But traditional compound (Composite) signal only can the transportation simulator image information, and can't transmission of digital signals, and therefore how combining composite signal and digital signal are so that the better effect of display device performance has become and needed improved important topic badly.
In the prior art, a kind of system in order to combining composite signal and digital signal has been proposed at present.This system comprises a composite signal, a digital signal, a signal shifter, a multiple show image process chip and an output interface at least.At first, elder generation's input composite signal and digital signal be system so far, switches the signal that desire shows by signal shifter again, and this signal is after multiple show image process chip is handled, export in the display device by output interface, and demonstrate an analog image picture or a digitized video picture.
The shortcoming of above-mentioned prior art is that composite signal and digital signal utilize different circuits to be exported respectively, that is must use transmission lines come transmission of digital signals more, the image data minimizing that causes composite signal can transmit.Moreover this system only can export the digitized video picture, does not but possess functions such as image control is arranged, but also must additionally increase many hardware costs.
[summary of the invention]
Because above-mentioned problem, purpose of the present invention provides a kind of system and method in order to combining composite signal and digital signal, particularly relevant for the technical field that a digital signal is added in the composite signal, to satisfy the user for demand in order to the system of combining composite signal and digital signal, and the shortcoming of solution prior art, only needing to use the synchronizing signal of former composite signal is exportable digital signal, and has an image control function, and only need change a little circuit, save many hardware costs.
Therefore, for reaching above-mentioned purpose,, comprise a signal input unit, a modulation unit and a demodulation unit at least according to the system of the present invention in order to combining composite signal and digital signal.Wherein, signal input unit receives a composite signal and a digital signal.In addition, the modulation unit has a bit pad, an accentuator (Emphasis), a synchronous signal detection device (Synchronous Signal Detector) and a modulator (Modulator).This bit pad is converted to a serial bit data with digital signal and is sent in the accentuator, and accentuator is in order to strengthen the serial bit data.When the synchronous signal detection device detects a synchronous signal of composite signal, make modulator that the serial bit data and the composite signal that have strengthened are carried out modulation then, to export the composite signal of modulation.Also have, demodulation unit has a digital analysis (Digital Analyzer), a string windrow stack buffer and a parallel buffer device.This digital analysis receives the composite signal of modulation, and isolates the serial bit data from the composite signal of modulation, and is sent to serial stack buffer device.When serial stack buffer device was piled with, then the parallel buffer device was converted to a parallel bit data with the serial bit data in the serial stack buffer device, and is sent to a display device.
For reaching above-mentioned purpose,, comprise step at least as back according to the method for the present invention in order to combining composite signal and digital signal:
(a) receive a composite signal and a digital signal.
(b) digital signal is converted to a serial bit data, and strengthens the serial bit data.
(c) when the synchronous signal that detects composite signal, then the serial bit data and the composite signal that have strengthened are advanced
Row one modulation action is to export the composite signal of modulation.
(d) receive the composite signal of modulation, and from the composite signal of modulation, isolate the serial bit data.
(e) storehouse serial bit data.
(f) when the serial bit data of storehouse outnumber a threshold value, then the serial bit data of storehouse are converted to a parallel bit data.And,
(g) transmit parallel bit data to a display device.
Compared to prior art, utilize the system and method in order to combining composite signal and digital signal of the present invention, satisfied the user for demand in order to the system of combining composite signal and digital signal, and the shortcoming of solution prior art, only needing to use the synchronizing signal of former composite signal is exportable digital signal, and have the image control function, and only need change a little circuit, save many hardware costs.
For purpose of the present invention, structural attitude and function thereof are had further understanding, conjunction with figs. is described in detail as follows now:
[description of drawings]
Fig. 1 shows the block schematic diagram of the system in order to combining composite signal and digital signal of the present invention.
Fig. 2 shows the oscillogram of a composite signal.
Fig. 3 shows the relevant oscillogram of the composite signal of modulation among the present invention.
Fig. 4 shows the circuit diagram of relevant demodulation unit among the present invention.
Fig. 5 shows the process flow diagram of the method in order to combining composite signal and digital signal of the present invention.
[embodiment]
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, hereinafter according to the system and method for the present invention in order to combining composite signal and digital signal, especially exemplified by preferred embodiment, and cooperate appended correlative type, be described in detail below, wherein identical assembly will be illustrated with identical element numbers.
See also Fig. 1, show the block schematic diagram of the present invention in order to the system of combining composite signal and digital signal.This system is generally used for the image control or a data presentation of a display device (as LCD TV, plasma-screen television or cathode-ray tube TV).In Fig. 1, this system comprises a signal input unit 11, a modulation unit 12 and a demodulation unit 13 at least.Wherein, signal input unit 11 receives a composite signal 111 and a digital signal 112.This composite signal 111 can be the signal of mixing one chroma (Chrominance) signal, a brightness (Luminance) signal and a synchronous signal 1111, and digital signal 112 then is a control signal, an image data or a lteral data.
In addition, modulation unit 12 has a bit pad 121, an accentuator 122, one a synchronous signal detection device 124 and a modulator 123.This bit pad 121 is a parallel converter that changes serial (Parallel to Serial), digital signal 112 is converted to a serial bit data 1211 and is sent in the accentuator 122, and accentuator 122 is then in order to strengthen the signal intensity of serial bit data 1211.When synchronous signal detection device 124 detects the synchronizing signal 1111 of composite signal 111, make the serial bit data 1221 that 123 pairs of modulators have strengthened carry out modulation then, to export the composite signal 1231 of modulation with composite signal 111.Generally speaking, modulator 123 is adjusted a voltage quasi position of synchronizing signal 1111 according to serial bit data 1211, and serial bit data 1211 are the binary data of digital signal 112, and the bit data 1 pairing voltage quasi position of serial bit data 1211 is lower than the bit data 0 pairing voltage quasi position of serial bit data 1211.Modulation unit 12 1 wired modes or a wireless mode composite signal 1231 of modulation are sent to demodulation unit 13.
See also Fig. 2, show the oscillogram of a composite signal.Among the figure, the user can utilize an oscillograph to watch the waveform of a composite signal, and it includes a signal of video signal 211 and a synchronous signal 212.When adding one digital signal was in composite signal, the present invention can carry out modulation to composite signal in order to the system of combining composite signal and digital signal, and modulating method is included as the voltage quasi position of adjusting synchronizing signal 212.
Please continue and consult Fig. 3, and, show the relevant oscillogram of the composite signal of modulation among the present invention with reference to Fig. 2.Among the figure, add when a digital signal is incorporated in the composite signal, image chrominance signal 211 remains unchanged, but the serial bit data of synchronizing signal after can being converted according to digital signal are adjusted.That is to say, when the serial bit data are 1, the present invention can strengthen the voltage quasi position of synchronizing signal 212 in order to the system of combining composite signal and digital signal, and become the voltage quasi position of synchronizing signal 221, promptly voltage quasi position becomes after the reinforcement in strengthening voltage quasi position district 224 (below 0.6 volts) in general voltage quasi position district 222 (0.3 volt～-0.3 volt) originally.And when the serial bit data were 0, the voltage quasi position of synchronizing signal 212 then remained unchanged, and equally was positioned at general voltage quasi position district 222.In addition, being provided with a buffer zone 223 (0.3 volt～-0.6 volt) between general voltage quasi position district 222 and the reinforcement voltage quasi position district 224, is not 1 or 0 in giving differentiation serial bit data in buffer zone 223.
See also Fig. 4, show the circuit diagram of relevant demodulation unit among the present invention.Among the figure, before separating modulation, prior to adding a digital signal in the composite signal, and modulation becomes the composite signal 311 of modulation, begins to separate modulation again.When composite signal 311 input voltages of modulation during greater than 0 volt, diode 312 can't be switched on, 0 volt of accurate position of operational amplifier 313 outputs, and numerical analysis and coding circuit 316 receive 0 accurate, do not operate.At this moment, if synchronous signal detection circuit 319 does not detect synchronizing signal, represent the general signal of video signal of composite signal 311 transmission of modulation, directly via composite signal code translator 320, transmission video streaming 321 is to TV 318.When the composite signal 311 of modulation begins synchronous signal transmissions, synchronous signal detection circuit 319 can be sent data useful signal (Data Valid Signal), and numerical analysis and coding circuit 316 begin to receive the serial bit signal and encode, in receive the serial bit signal and the coding finish after, it is exported in the TV 318 via control/data bus 317.
See also Fig. 5, show the process flow diagram of the present invention in order to the method for combining composite signal and digital signal.Among the figure, the block schematic diagram of the corresponding system in order to combining composite signal and digital signal shown in Figure 1 of the method, and be generally used for the image control or a data presentation of a display device (as LCD TV, plasma-screen television or cathode-ray tube TV), it comprises step at least as back:
Step S41: receive a composite signal 111 and a digital signal 112.This composite signal 111 is generally the signal of mixing one chroma signals, a luminance signal and a synchronous signal 1111, and digital signal 112 then is a control signal, an image data or a lteral data.
Step S42: digital signal 112 is converted to a serial bit data 1211 and strengthens serial bit data 1211.
Step S43: when the synchronous signal 1111 that detects composite signal 111, satisfy the serial bit data 1221 that strengthened are carried out modulation action with composite signal 111, to export the composite signal 1231 of modulation.A voltage quasi position of synchronizing signal 1111 is adjusted in this modulation action according to serial bit data 1211, and serial bit data 1211 are the binary data of digital signal 112, and the bit data 1 pairing voltage quasi position of serial bit data 1211 is lower than the bit data 0 pairing voltage quasi position of serial bit data 1211.
Step S44: receive the composite signal 1231 of modulation, and from the composite signal 1231 of modulation, isolate serial bit data 1211.
Step S45: storehouse serial bit data 1211.
Step S46: when the serial bit data of storehouse outnumbered a threshold value, then the serial bit data of storehouse were converted to a parallel bit data 1331.
Step S47: transmit parallel bit data 1331 to display device 14.
Claims (15)
1. the system in order to combining composite signal and digital signal is applicable to a display device, it is characterized in that, this system comprises:
One signal input unit receives a composite signal and a digital signal;
One modulation unit, have a bit pad, an accentuator, a synchronous signal detection device and a modulator, wherein this bit pad is converted to a serial bit data with this digital signal and is sent in this accentuator, and this accentuator strengthens this serial bit data, when this synchronous signal detection device detects a synchronous signal of this composite signal, then make this modulator that these serial bit data that strengthened and this composite signal are carried out modulation, this modulator is adjusted a voltage quasi position of this synchronizing signal according to these serial bit data, to export the composite signal of modulation; And
One demodulation unit, have a digital analysis, a string windrow stack buffer and a parallel buffer device, wherein this digital analysis receives this composite signal of modulation, and isolate this serial bit data the composite signal of modulation from this, and be sent to this serial stack buffer device, when this serial stack buffer device was piled with, then this parallel buffer device was converted to a parallel bit data with these serial bit data in this serial stack buffer device, and is sent to this display device.
2. the system in order to combining composite signal and digital signal as claimed in claim 1 is characterized in that, this display device is included as a LCD TV, a plasma-screen television or a cathode-ray tube TV.
3. the system in order to combining composite signal and digital signal as claimed in claim 1 is characterized in that, this composite signal is the signal of mixing one chroma signals, a luminance signal and this synchronizing signal.
4. the system in order to combining composite signal and digital signal as claimed in claim 1 is characterized in that, this digital signal is included as a control signal, an image data or a lteral data.
5. the system in order to combining composite signal and digital signal as claimed in claim 1 is characterized in that, this bit pad is included as a parallel converter that changes serial.
6. the system in order to combining composite signal and digital signal as claimed in claim 1 is characterized in that, these serial bit data are the binary data of this digital signal.
7. the system in order to combining composite signal and digital signal as claimed in claim 6 is characterized in that, the bit data 1 pairing voltage quasi position of these serial bit data is lower than the bit data 0 pairing voltage quasi position of these serial bit data.
8. the system in order to combining composite signal and digital signal as claimed in claim 1 is characterized in that, this composite signal of modulation be sent to this demodulation unit with a wired mode or a wireless mode.
9. the system in order to combining composite signal and digital signal as claimed in claim 1 is characterized in that, utilizes a parallel control bus to be connected between this parallel buffer device and this display device.
10. the method in order to combining composite signal and digital signal is applicable to a display device, it is characterized in that, this method comprises:
Receive a composite signal and a digital signal;
This digital signal is converted to a serial bit data, and strengthens this serial bit data;
When the synchronous signal that detects this composite signal, satisfy these serial bit data that strengthened and this composite signal are carried out modulation action, this modulator is adjusted a voltage quasi position of this synchronizing signal according to these serial bit data, to export the composite signal of modulation;
Receive this composite signal of modulation, and isolate this serial bit data the composite signal of modulation from this;
These serial bit data of storehouse;
When the serial bit data of storehouse outnumber a threshold value, then with this serial bit data of storehouse be converted to a parallel bit data; And
Transmit this parallel bit data to this display device.
11. the method in order to combining composite signal and digital signal as claimed in claim 10 is characterized in that, this display device is included as a LCD TV, a plasma-screen television or a cathode-ray tube TV.
12. the method in order to combining composite signal and digital signal as claimed in claim 10 is characterized in that, this composite signal is the signal of mixing one chroma signals, a luminance signal and this synchronizing signal.
13. the method in order to combining composite signal and digital signal as claimed in claim 10 is characterized in that, this digital signal is included as a control signal, an image data or a lteral data.
14. the method in order to combining composite signal and digital signal as claimed in claim 10 is characterized in that, these serial bit data are the binary data of this digital signal.
15. the method in order to combining composite signal and digital signal as claimed in claim 10 is characterized in that, the bit data 1 pairing voltage quasi position of these serial bit data is lower than the bit data 0 pairing voltage quasi position of these serial bit data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100285833A CN101599259B (en) | 2008-06-06 | 2008-06-06 | System and method for combining composite signal and digital signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100285833A CN101599259B (en) | 2008-06-06 | 2008-06-06 | System and method for combining composite signal and digital signal |
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| CN101599259B true CN101599259B (en) | 2011-06-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639777A (en) * | 1983-12-16 | 1987-01-27 | Matsushita Electric Industrial Co., Ltd. | Apparatus for scrambling and descrambling communication signals |
| CN1116388A (en) * | 1993-12-29 | 1996-02-07 | 大宇电子株式会社 | Character and pattern mixing apparatus for use in a video equipment |
| CN1134081A (en) * | 1994-12-19 | 1996-10-23 | 三星电子株式会社 | Image superimposing apparatus |
| CN1270472A (en) * | 1999-02-26 | 2000-10-18 | 佳能株式会社 | System and method for controlling image display |
| CN2507208Y (en) * | 2001-12-17 | 2002-08-21 | 中国科学院国家授时中心 | Television standard time code demodulator |
-
2008
- 2008-06-06 CN CN2008100285833A patent/CN101599259B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639777A (en) * | 1983-12-16 | 1987-01-27 | Matsushita Electric Industrial Co., Ltd. | Apparatus for scrambling and descrambling communication signals |
| CN1116388A (en) * | 1993-12-29 | 1996-02-07 | 大宇电子株式会社 | Character and pattern mixing apparatus for use in a video equipment |
| CN1134081A (en) * | 1994-12-19 | 1996-10-23 | 三星电子株式会社 | Image superimposing apparatus |
| CN1270472A (en) * | 1999-02-26 | 2000-10-18 | 佳能株式会社 | System and method for controlling image display |
| CN2507208Y (en) * | 2001-12-17 | 2002-08-21 | 中国科学院国家授时中心 | Television standard time code demodulator |
Non-Patent Citations (1)
| Title |
|---|
| JP昭62-279784A 1987.12.04 |
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