CN102053659B - Wireless transmission interface for transmitting video signals and power control method thereof - Google Patents
Wireless transmission interface for transmitting video signals and power control method thereof Download PDFInfo
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- CN102053659B CN102053659B CN 200910220806 CN200910220806A CN102053659B CN 102053659 B CN102053659 B CN 102053659B CN 200910220806 CN200910220806 CN 200910220806 CN 200910220806 A CN200910220806 A CN 200910220806A CN 102053659 B CN102053659 B CN 102053659B
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Abstract
The invention provides a wireless transmission interface for transmitting video signals and a power control method thereof, wherein a plurality of antennas are used for transmitting video signals. The wireless transmission interface is used for processing video signals to generate y modulation signals according to signal formats, modulation types, video picture resolution, power supply condition of a local device, channel transmission quality parameters, user control signals or feedback control signals, corresponding to the video signals, and y antennas are used for carrying and transmitting the y modulation signals to a wireless channel. The wireless transmission interface can also control switches and gains of y amplifier circuits connected with the y antennas according to at least one of the illustrated parameters.
Description
Technical field
The present invention relates to a kind of wireless transmission interface, relate in particular to a kind of wireless transmission interface and power control method thereof in order to transmit video signal, and the local side device with computing power and ability to communicate that uses this wireless transmission interface.
Background technology
Along with the progress of science and technology, conventional weight is heavy little by little to be replaced by compact notebook computer replacement or other mobile devices with bulky desktop computer.Because notebook computer has portability, therefore external display device can't with fixing connecting line therewith notebook computer as the medium of linking up.In other words, how external exactly display device can together not move with notebook computer, so notebook computer can be because the problem of connecting line length links and can't continue external therewith display device.
Present stage computer and display device between can pass through Video Graphics Array (Video Graphic Array, VGA) cable, digital visual interface (Digital Visual Interface, DVI) cable or high-definition multimedia interface (High Definition Multimedia Interface) cable link.In general, display device all has VGA cable interface and HDMI cable interface at present.The signal that the VGA form uses is simulating signal, and therefore along with the increase of distance, in the VGA cable, the distortion of signal also can be larger, and cause serious Missing data (data loss).HDMI 1.3 is present up-to-date HDMI form, it can transmit video signal and the sound without compression with the transfer rate of per second 10,200,000,000 bits (10.2Gbit/sec), but because of the expensive of the HDMI cable that uses HDMI 1.3 forms and the reason that can not fold, and make equally the distance between computer and display device can't be long.
Summary of the invention
The invention provides a kind ofly in order to transmit the wireless transmission interface of video signal, it comprises input end interface, transceiving chip group, an x amplifier circuit, an x antenna and control circuit.Input end interface is given the video signal data of meter displaying device in order to receive the tendency to develop of local side device institute, and exports accordingly video signal.The transceiving chip group has input end in order to the receiving video signal, and has x modulating signal output terminal.Each amplifier circuit has input end and output terminal, and the input end of each amplifier circuit is coupled to one of them of x modulating signal output terminal.Each antenna is coupled to one of them of x output terminal of x amplifier circuit.control circuit signal format corresponding according to video signal, the modulation mode, video pictures resolution, the power status of local side device, the channel transfer Q factor, user's control signal or back coupling control signal are controlled the transceiving chip group video signal are carried out the signal processing, to produce y modulating signal to y modulating signal output terminal, and control circuit signal format corresponding according to video signal, the modulation mode, video pictures resolution, the power status of local side device, the channel transfer Q factor, user's control signal or back coupling control signal are controlled the switch of y corresponding this y amplifier circuit of modulating signal output terminal, and use antenna transmission y modulating signal corresponding to y amplifier circuit to radio channel, wherein y is less than or equal to x, and greater than 0.
In addition, the present invention also provides a kind of local side device with computing power and ability to communicate, and in order to sending video signal data to meter displaying device, and this local side device has above-mentioned wireless transmission interface.
The invention provides a kind of power control method for wireless transmission interface, wireless transmission interface is sent to meter displaying device in order to the video signal data with the local side device, wherein the local side device has x transmission path, and each transmission path has an antenna and an amplifier circuit.At first, convert video signal data to video signal.Then, signal format, video pictures resolution and the modulation mode according to video signal determines that minimum antenna uses number s.Afterwards, according to power status, channel transfer Q factor, user's control signal or the back coupling control signal decision antenna use number y of local side device, and video signal is carried out signal process, to produce y modulating signal to y antenna.Afterwards, the power status of signal format corresponding according to video signal, modulation mode, video pictures resolution, local side device, channel transfer Q factor, user's control signal maybe are somebody's turn to do switch or the gain that the back coupling control signal is controlled y the corresponding y of an antenna amplifier circuit.At last, use y the antenna signal that it is received to be carried to radio channel, wherein more than or equal to s, and y is less than or equal to x greater than 0, y for s.
based on above-mentioned, the wireless transmission interface that the embodiment of the present invention provides and power control method thereof can allow the computer or the mobile device that adopt the method and wireless transmission interface video signal data can be transmitted the meter displaying device broadcast, simultaneously, the number of antennas that this wireless transmission interface uses, amplifier gain can be controlled by multiple different parameter from the switch of amplifier, make computer or mobile device save the electric power that consumes and can reach, can allow again the user view and admire by meter displaying device the video signal that computer or mobile device are play, to enjoy the high image quality video signal.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and coordinate appended graphic being described in detail below.
Description of drawings
Fig. 1 is the schematic diagram of the video transmission system that provides according to the embodiment of the present invention.
Fig. 2 is the circuit diagram in order to the wireless transmission interface that transmits video signal that provides according to the embodiment of the present invention.
Fig. 3 is the circuit diagram of a kind of wireless transmission interface of providing according to the embodiment of the present invention.
Fig. 4 is the circuit diagram of a kind of wireless transmission interface of providing according to the embodiment of the present invention.
Fig. 5 is the process flow diagram of the power control method that is used for wireless transmission interface that provides of the embodiment of the present invention.
Fig. 6 is the process flow diagram of the power control method that is used for wireless transmission interface that provides of another embodiment of the present invention.
Fig. 7 is the process flow diagram of the power control method that is used for wireless transmission interface that provides of another embodiment of the present invention.
Fig. 8 is the process flow diagram of the power control method that is used for wireless transmission interface that provides of another embodiment of the present invention.
Main description of reference numerals:
10: the video transmission system; 100: notebook computer;
120: TV; 102,122: multi-antenna transceiving device;
20: wireless transmission interface; 200,202: input end interface;
220: the transceiving chip group;
240,242,244,246,248: amplifier circuit;
260,262,264,266: antenna; 270: control circuit;
30: wireless transmission interface; 300,302: input end interface;
320: the transceiving chip group;
340,342,344,346,348: amplifier circuit;
360,362,364,366: antenna; 370: control circuit;
380,382,384,386: switch; 40: wireless transmission interface;
400,402: input end interface; 420: the transceiving chip group;
440,442,444,446,448: amplifier circuit;
460,462,464,466: antenna; 470: control circuit;
480,482,484,486: variable resistor; IN1～IN3: the input end of transceiving chip group;
OUT1～OUT4: the output terminal of transceiving chip group;
S510～S550: steps flow chart; S610～S640: steps flow chart;
S710～S880: steps flow chart; S810～S880: steps flow chart.
Embodiment
It is a kind of in order to transmit the wireless transmission interface of video signal that the embodiment of the present invention provides.This kind wireless transmission interface is applicable to various types of computers and mobile device, and can support various different video signal forms.Below will coordinate with word and graphic above-mentioned wireless transmission interface be done further introduction, but need to prove, following explanation is only embodiments of the invention, is not to limit the present invention.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of the video transmission system that provides according to the embodiment of the present invention.In this video transmission system 10, notebook computer 100 is the local side device, and external TV 120 is meter displaying device.Notebook computer 100 links mutually with the mode of TV 120 by wireless telecommunications, and carries out the transmission of video signal data.The wireless transmission interface of notebook computer 100 has multi-antenna transceiving device 102, and this multi-antenna transceiving device 102 has many strip antennas and signal processing apparatus.The signal processing apparatus of multi-antenna transceiving device 102 is in order to video signal data is carried out modulation (also may comprise coding or filtering), to produce more than one modulating signal to the antenna of multi-antenna transceiving device 102.Then, the antenna of multi-antenna transceiving device 102 is carried to radio channel in order to the modulating signal that it is received.The wireless transmission interface of TV 120 has multi-antenna transceiving device 122, and this multi-antenna transceiving device 122 has many strip antennas and signal processing apparatus.In this multi-antenna transceiving device 122 at least one antenna is in order to receiving above-mentioned modulating signal from radio channel, and the signal processing apparatus that the modulating signal that receives is given multi-antenna transceiving device 122 is carried out the video signal data that demodulation (even may comprise decoding, filtering with etc. change) is transmitted with acquisition notebook computer 100.In addition, although be noted that the multi-antenna transceiving device 102 and 122 in Fig. 1 is positioned at the outside of notebook computer 100 and TV 120, but in fact also can use VLSI (very large scale integrated circuit) (Vary Large Scale Integrated circuit, VLSI) technology to be implemented in the inside chip of notebook computer 100 and TV 120.
the not special restriction of the modulation mode that above-mentioned multi-antenna transceiving device 102 and 122 uses, but under the requirement of high transfer rate, it can adopt orthogonal frequency division multi-task (Orthogonal FrequencyDivision Modulation, OFDM) high order modulation, quadrature amplitude modulation (the Quadrature Amplitude Modulation of 256 points (can be even 512 or 1024 points) for example, QAM), so every antenna can reach the approximately transfer rate of 320 megabits (320Mbit/sec) (that is have 40 megahertzes (40MHz) frequency range) of per second.In addition, it is also unrestricted that multi-antenna transceiving device 102 and 122 carries out the frequency range that video signal data transmission uses, its can use 2,400,000,000 to 2,500,000,000 hertz (2.4GHz～2.5GHz) for industry, science and medical open frequency range (Industrial, Science, Medical Band, ISM Band) or use the frequency range of 5,000,000,000 hertz (5GHz).
When the modulation mode of using when multi-antenna transceiving device 102 and 122 adopts 256 QAM of above-mentioned OFDM, when transmitting if necessary the video signal of 30 720 * 720 pixel pictures of per second (720P@30fps), approximately need the frequency range of 720Mbit/sec, therefore need at least two antennas to transmit.When transmitting if necessary the video signal of 30 1080 * 1080 pixel pictures of per second (1080P@30fps), approximately need the frequency range of 1.5Gbit/sec, therefore need at least four antennas to transmit.
Above-mentioned multi-antenna transceiving device 102 can according to the resolution of video signal form, video pictures, modulation mode, power status, measurement to the channel transfer Q factor, feedback control signal or user's control signal and decide the antenna of multi-antenna transceiving device 102 to use number or the yield value of the amplifier that uses, gain or shutdown amplifier to close accordingly antenna, the step-down amplifier that need not use, and then save the electric power that notebook computer 100 consumes.
Multi-antenna transceiving device 122 can be estimated the bit error rate or the package Loss Rate that, and produces according to bit error rate or package Loss Rate and feedback control signal to multi-antenna transceiving device 102.Then multi-antenna transceiving device 102 just can antenna that control signal determines multi-antenna transceiving device 102 uses number or the yield value of the amplifier that uses according to feedbacking.as the user when watching video signal, if want to switch video signal form (for example switching to HDMI from VGA), the resolution (for example switching to 1080P@30fps from 720P@30fps) of modulation mode (for example switching to 64 QAM from 256 QAM) or video pictures, the user can use a teleswitch and produce user's control signal, and directly send this user's control signal to multi-antenna transceiving device 102, or first send multi-antenna transceiving device 122 to, send this user's control signal to multi-antenna transceiving device 102 by multi-antenna transceiving device 122 again.After multi-antenna transceiving device 102 was received user's control signal, multi-antenna transceiving device 102 can determine that the antenna of multi-antenna transceiving device 102 uses number or the yield value of the amplifier that uses according to user's control signal.
In addition, multi-antenna transceiving device 102 itself also can measure the channel transfer Q factor, use number or the yield value of the amplifier that used with the antenna that determines multi-antenna transceiving device 102, wherein above-mentioned channel transfer quality comprises the bit error rate estimated or package Loss Rate etc.The power supply that notebook computer 100 uses may be internal cell or (for example use the externally fed device, be connected to the transformer of socket), if notebook computer 100 adopts the internal cell power supply, multi-antenna transceiving device 102 may reduce antenna use number, step-down amplifier gain or close the part amplifier, if notebook computer 100 adopts the power supply of externally fed devices, multi-antenna transceiving device 102 antenna that may increase uses number, improves amplifier gain or opening section or whole amplifiers.It is worth mentioning that, if when notebook computer 100 adopts internal cell power supply and power shortage, multi-antenna transceiving device 102 even may reduce antenna and use number, step-down amplifier gain or closed portion amplifier.
The resolution of video signal form, video pictures and modulation mode can determine the minimum number of antennas of required use, in addition, the resolution of video signal form, video pictures and modulation mode can be also the foundations that adjustment amplifier gain or control amplifier are closed unlatching.According to Principle of Communication, the antenna technology of (antennadiversity) of gathering together can be so that the error rate during data transmission descends, therefore multi-antenna transceiving device 102 is except the minimum number of antennas that resolution and the modulation mode of foundation video signal form, video pictures decides use, the correctness that the number of antennas of its use can be transmitted to increase video signal data greater than minimum number of antennas.
Although above-mentioned illustrated multi-antenna transceiving device 102 how according to the resolution of video signal form, video pictures, modulation mode, power status, measurement to the channel transfer Q factor, feedback control signal or user's control signal and decide the antenna of multi-antenna transceiving device 102 to use number or the individual cases of the yield value of the amplifier that uses, the present invention is not limited to this.Above-mentioned use decides the antenna of multi-antenna transceiving device 102 to use number or the parameter of the yield value of the amplifier that uses can have right of priority, for example, after the minimum number of antennas that resolution and the modulation mode of video signal form, video pictures can determine required use, back coupling control signal, the channel transfer Q factor that measures, back coupling control signal or user's control signal etc. only can be used number in order to increase antenna, use number and can't reduce accordingly antenna.
In addition, the form of above-mentioned video signal can VGA, HDMI or DVI form, and in other words, the signal of above-mentioned video signal can be low voltage difference signal (LVDS) or HDMI signal.In brief, the form of video signal and signal type are not to limit the present invention.In addition, although above-mentioned local side device take notebook computer 100 as example, it is not to limit the present invention.In other words, above-mentioned local side device can be also that general desktop computer, intelligent mobile phone, personal digital assistant (Personal DigitalAssistant, PDA) installed or it has the electronic installation of communication and computing function.Similarly, although above-mentioned meter displaying device take TV 120 as example, it is also non-in order to limiting the present invention, above-mentioned meter displaying device can be also that screen, projection arrangement or other have the electronic installation of Presentation Function.
Then, please refer to Fig. 2, Fig. 2 is the circuit diagram in order to the wireless transmission interface that transmits video signal that provides according to the embodiment of the present invention.Wireless transmission interface 20 is implemented on the above-mentioned any electronic installation with communication and computing function, for example notebook computer.Wireless transmission interface 20 comprises input end interface 200,202, transceiving chip group 220, amplifier circuit 240,242,244,246,248, a plurality of antenna 260,262,264,266 and control circuit 270.Input end interface 200 and 202 output terminal are respectively coupled to two input end IN1, IN2 of transceiving chip group 220, output terminal OUT1～the OUT4 of transceiving chip group 220 is coupled to amplifier circuit 240,242,244,246 input end, the output terminal of amplifier circuit 248 is coupled to the input end IN3 of transceiving chip group 220, and antenna 260,262,264,266 is respectively coupled to amplifier circuit 240,242,244,246 output terminal, and wherein at least one antenna 262 also is coupled to the input end of amplifier circuit 248.
Although be noted that the embodiment of Fig. 2 only uses as receiving with an amplifier circuit 248 and antenna 262, for example receive aforesaid back coupling control signal or user's control signal, the present invention is not limited to this.According to Principle of Communication, the technology that antenna is gathered together can be so that the error rate during data transmission descends, therefore if will increase the correctness of transceiving chip group 220 received signals, can increase in order to amplify receive signal amplifier circuit in other antenna-path, and use other antennas to receive.In brief, the embodiment of Fig. 2 is only in order to convenient explanation, and is non-in order to limit the present invention.
Above-mentioned amplifier circuit 240,242,244 and 246 close and open all and can be controlled by wireless transmission interface 20, even amplifier circuit 240,242,244,246 and 248 yield value also can be controlled by wireless transmission interface 20.In addition, above-mentioned control can be completed by control circuit 270, and this control circuit 270 can be implemented in transceiving chip group 220, is perhaps an independent circuits in wireless transmission interface 20.Input end interface 200 is converted in order to the video signal data that will receive the signal format that corresponding video signal form uses with 202, transceiving chip group 220 comprises modulation/detuner, multiplexer and coder/decoder etc., transceiving chip module 220 carries out modulation (even may comprise coding or filtering) in order to the signal that input end interface 200 or 202 is exported, amplify to produce the amplifier circuit that one or more modulating signals give to open, and allow the corresponding antenna of amplifier circuit opened carry modulating signal after amplification.
In the embodiment of Fig. 2, the video signal data that the local side device can will transmit is according to one of them to input end interface 200 and 202 of the video signal form transmission video signal data that will use at present, for example, input end interface 200 can coordinate the VGA form and video signal data is converted to the LVDS signal, and input end interface 202 can coordinate the HDMI form and video signal data is converted to the HDMI signal.The minimum number of antennas that control circuit 270 meetings of wireless transmission interface 20 will be used according to the resolution decision of modulation mode, video signal form and video pictures.
For example suppose that the modulation mode is to use the resolution of OFDM and 256-QAM and video pictures to fix, when the video signal form is the VGA form, transceiving chip group 220 can be carried out the LVDS signal modulation (even may comprise coding or filtering), amplify for 2 amplifier circuits (for example 240 and 242) to produce 2 modulating signals, and allow two antennas (for example 260 and 262) that the output of amplifier circuit (for example 240 and 242) is carried to radio channel.For example suppose that the modulation mode is to use the resolution of OFDM and 256-QAM and video pictures to fix, when the video signal form is the HDMI form, transceiving chip group 220 can be carried out modulation (even may comprise coding or filtering) with the HDMI signal according to the control of control circuit 270, amplify for 4 amplifier circuits 240,242,244 and 246 to produce 4 modulating signals, and allow 4 antennas 260,262,264 and 266 that amplifier circuit 240,242,244 and 246 output are carried to radio channel.
In addition, in the embodiment of Fig. 2, the control circuit 270 of wireless transmission interface 20 also can be according to local side installation's power source situation, the channel transfer Q factor that measures, feedback control signal or user's control signal decides amplifier circuit 240,242,244,246 and 248 gain.Simultaneously, if in the situation that the local side installation's power source is enough, and when the channel transfer Q factor display channel transmission quality that measurement is arrived is not good, can use greater than minimum antenna and use the antenna of number to carry out the transmission of video signal data, to improve the correctness of the video signal data that meter displaying device receives.Similarly, if in the situation that the local side installation's power source is enough, and awarding control signal or user's control signal indicates in the time of will using more number of antennas, also can use greater than minimum antenna and use the antenna of number to carry out the transmission of video signal data, to improve the correctness of the video signal data that meter displaying device receives.
In the embodiment of Fig. 2, if amplifier circuit is closed, the antenna of respective path also can wholely be closed.In other words, in Fig. 2, use if antenna is selected, corresponding amplifier circuit also can be unlocked.Yet, sometimes to give the amplification that modulating signal that antenna carries may not need amplifier circuit, therefore, the embodiment of Fig. 3 provides comparatively flexible wireless transmission interface.Below will at length introduce another embodiment of wireless transmission interface.
Please refer to Fig. 3, Fig. 3 is the circuit diagram of a kind of wireless transmission interface of providing according to the embodiment of the present invention.Wireless transmission interface 30 comprises input end interface 300,302, transceiving chip group 320, amplifier circuit 340,342,344,346,348, a plurality of antenna 360,362,364,366, a plurality of switch 380,382,384,386 and control circuit 370. Input end interface 300 and 302 output terminal are respectively coupled to two input end IN1, IN2 of transceiving chip group 320, output terminal OUT1～the OUT4 of transceiving chip group 320 is coupled to amplifier circuit 340,342,344,346 input end, the output terminal of amplifier circuit 348 is coupled to the input end IN3 of transceiving chip group 320, and antenna 360,362,364,366 is respectively coupled to amplifier circuit 340,342,344,346 output terminal, and wherein at least one antenna 362 also is coupled to the input end of amplifier circuit 348.
In addition, switch 380,382,384,386 short circuit are all controlled by the control circuit 370 of wireless transmission interface 30 with open circuit, wherein the two ends of switch 380 are coupled to input end and the output terminal of amplifier circuit 342, the two ends of switch 382 are coupled to input end and the output terminal of amplifier circuit 340, the two ends of switch 384 are coupled to input end and the output terminal of amplifier circuit 346, and the two ends of switch 386 are coupled to input end and the output terminal of amplifier circuit 344.
Above-mentioned amplifier circuit 340,342,344 and 346 close and open all and can be controlled by the control circuit 370 of wireless transmission interface 30, even amplifier circuit 340,342,344,346 and 348 yield value also can be controlled by the control circuit 370 of wireless transmission interface 30.Input end interface 300 is converted in order to the video signal data that will receive the signal format that corresponding video signal form uses with 302, transceiving chip group 320 comprises modulation/detuner, multiplexer and coder/decoder etc., the signal that transceiving chip module 320 is exported input end interface 300 or 302 according to the control of control circuit 370 carries out modulation (even may comprise coding or filtering), amplify to produce the amplifier circuit that one or more modulating signals give to open, and allow the corresponding antenna of amplifier circuit opened carry modulating signal after amplification.
With the embodiment of Fig. 2 to some extent difference be, when the power supply that the embodiment of Fig. 3 adopts at the local side device is its internal cell or battery electric power deficiency, or when not needing to amplify modulating signal, the control circuit 370 of wireless transmission interface 30 switch that can control the antenna corresponding path that is unlocked becomes short-circuit condition, and corresponding amplifier circuit is closed the electric power that is consumed to save thus the local side device.Yet, the power supply that adopts at the local side device is that externally fed device or battery electric power are when enough, or do not need modulating signal when guaranteeing the reception quality, the control circuit 370 of wireless transmission interface 30 switch that can control the antenna corresponding path that is unlocked becomes open-circuit condition, and corresponding amplifier circuit is opened.
for instance, suppose that the modulation mode is for using OFDM and 256-QAM, the resolution of video pictures is fixed, and when the local side device uses its internal cell power supply, when the video signal form is the VGA form, transceiving chip group 320 can be carried out the LVDS signal modulation (even may comprise coding or filtering), allow two antennas (for example 360 and 362) that this modulating signal is carried to radio channel to produce the switch of 2 modulating signals by short circuit (for example 380 and 382), wherein amplifier circuit 340, 342, 344 and 346 are all closed by the control circuit 370 of wireless transmission interface 30, to save the electric power that is consumed of battery.again for example, suppose that the modulation mode is to use the resolution of OFDM and 256-QAM and video pictures to fix, and when the local side device uses the power supply of externally fed device, when the video signal form is the HDMI form, transceiving chip group 320 can be carried out the HDMI signal modulation (even may comprise coding or filtering), to produce 4 modulating signals to 4 amplifier circuits 340, 342, 344 and 346 amplify, and allow 4 antennas 360, 362, 364 and 366 with amplifier circuit 340, 342, 344 and 346 output is carried to radio channel, this moment, the control circuit 370 of wireless transmission interface 30 was understood gauge tap 380, 382, 384 and 386 present open-circuit condition.
Then, please refer to Fig. 4, Fig. 4 is the circuit diagram of a kind of wireless transmission interface of providing according to the embodiment of the present invention.But wireless transmission interface 40 comprises input end interface 400,402, transceiving chip group 420, amplifier circuit 440,442,444,446,448, a plurality of antenna 460,462,464,466 power transformation groups 480,482,484,486 and control circuit 470. Input end interface 400 and 402 output terminal are respectively coupled to two input end IN1, IN2 of transceiving chip group 420, output terminal OUT1～the OUT4 of transceiving chip group 420 is coupled to amplifier circuit 440,442,444,446 input end, the output terminal of amplifier circuit 448 is coupled to the input end IN3 of transceiving chip group 420, and antenna 460,462,464,466 is respectively coupled to amplifier circuit 440,442,444,446 output terminal, and wherein at least one antenna 462 also is coupled to the input end of amplifier circuit 448.
In addition, variable resistor 480,482,484,486 resistance value are all controlled by the control circuit 470 of wireless transmission interface 40, wherein the two ends of variable resistor 480 are coupled to input end and the output terminal of amplifier circuit 442, the two ends of variable resistor 482 are coupled to input end and the output terminal of amplifier circuit 440, the two ends of variable resistor 484 are coupled to input end and the output terminal of amplifier circuit 446, and the two ends of variable resistor 486 are coupled to input end and the output terminal of amplifier circuit 444.
Different from Fig. 2 is, the embodiment of Fig. 4 adds a negative feedback resistance (that is above-mentioned variable resistor) between the output of each amplifier circuit and input end, the gain of each amplifier circuit except can the control circuit 470 by wireless transmission interface 40 directly controlling, but can also adjust by control circuit 470 adjustment power transformation resistance the gain of each amplifier circuit.If the gain of each above-mentioned amplifier circuit is fixed gain, can utilize the variable resistor of Fig. 4 embodiment.By adjusting variable resistor, change the gain of each amplifier circuit.In other words, each amplifier circuit of Fig. 4 can be the amplifier circuit of gain adjustable or the amplifier circuit of fixed gain, yet if will adjust the gain of each amplifier circuit of Fig. 2 and Fig. 3, each amplifier circuit of Fig. 2 and Fig. 3 is necessary for the amplifier circuit of gain adjustable.
After having introduced the wireless transmission interface that the embodiment of the present invention provides, then, the embodiment of the above-mentioned power control method that wireless transmission interface was used is described with Fig. 5.Please refer to Fig. 5, Fig. 5 is the process flow diagram of the power control method that is used for wireless transmission interface that provides of the embodiment of the present invention.At first, at step S510, input end interface converts video signal data to video signal, the signal format of this video signal is the corresponding signal format of video signal form of input end interface standard, wherein this video signal data is the video signal that the local side device will send meter displaying device to, and the signal format of input end interface institute standard can be HDMI or LVDS signal format.
At step S520, the control circuit of wireless transmission interface determines that according to the resolution of video signal form, video pictures and modulation mode minimum antenna uses number s, and wherein s is less than or equal to operational number of antennas x, and greater than 0.Then, at step S530, the control circuit of wireless transmission interface determines that according to power status, channel transfer Q factor, user's control signal or the back coupling control signal of local side device antenna uses number y, and video signal is carried out signal process, to y antenna, this y modulating signal is carried to radio channel to produce y modulating signal, wherein y is more than or equal to s, and less than or equal to x.In step S530, relevant how to determine that mode that antenna uses number y as described earlier, just repeats no more at this.
At step S540, the resolution of the control circuit of wireless transmission interface signal format corresponding according to video signal, modulation mode, video pictures, the power status of local side device, channel transfer Q factor, user's control signal or back coupling control signal are controlled switch or the gain of y the amplifier circuit that is connected with y antenna.In addition, be noted that, at step S540, (x-y) individual amplifier circuit is not because (x-y) individual antenna of its correspondence needs to carry signal to radio channel in addition, therefore (x-y) individual amplifier circuit can be closed, that is closes and the corresponding transmission path of (x-y) individual antenna.Gain corresponding to y amplifier circuit of the y that will carry a modulating signal antenna can be adjusted according to above-mentioned parameter, the mode of its adjustment is as the explanation of prior figures 2 or Fig. 4, the control circuit of wireless transmission interface directly the control amplifier circuit gain or utilize the variable resistor of feedbacking to adjust gain.In addition, wireless transmission interface can also design the described mode as Fig. 3, y amplifier circuit corresponding to the y that will carry a modulating signal antenna like this all has switch and is coupled between input and output terminal, and the control circuit of wireless transmission interface can be controlled according to above-mentioned parameter switch and the short circuit at beginning and the open circuit of y amplifier circuit, when the switch short circuit, corresponding amplifier circuit is just closed, and vice versa.At last, at step S550, wireless transmission interface uses y the antenna signal that it is received to be carried to radio channel.
Then, please refer to Fig. 6, Fig. 6 is the process flow diagram of the power control method that is used for wireless transmission interface that provides of another embodiment of the present invention.Compared to the method for Fig. 5, the power control method of Fig. 6 is just comparatively simple, and it only utilizes switch or the gain that decides amplifier circuit than the power status of local side device.At first, at step S610, input end interface converts video signal data to video signal, and the signal format of this video signal is the corresponding signal format of video signal form of input end interface standard.Then, at step S620, the control circuit of wireless transmission interface determines that according to resolution and the modulation mode of video signal form, video pictures minimum antenna uses number s, and video signal is carried out signal process, to s antenna, this s modulating signal is carried to radio channel to produce s modulating signal.
Then, in step S630, the control circuit of wireless transmission interface is controlled switch or the gain of s the amplifier circuit that is connected with s antenna according to the power status of local side device.Be noted that, at step S630, (x-s) individual amplifier circuit is not because (x-s) individual antenna of its correspondence needs to carry signal to radio channel in addition, therefore (x-s) individual amplifier circuit can be closed, that is closes and the corresponding transmission path of (x-s) individual antenna.Gain corresponding to s amplifier circuit of the s that will carry a modulating signal antenna can be adjusted according to power status, the mode of its adjustment is as the explanation of prior figures 2 or Fig. 4, the control circuit of wireless transmission interface directly the control amplifier circuit gain or utilize the variable resistor of feedbacking to adjust gain.In addition, wireless transmission interface can also design the described mode as Fig. 3, s amplifier circuit corresponding to the s that will carry a modulating signal antenna like this all has switch and is coupled between input and output terminal, and the control circuit of wireless transmission interface can be controlled the switch of s amplifier circuit and short circuit and the open circuit of switch according to above-mentioned parameter, when the switch short circuit, corresponding amplifier circuit is just closed, and vice versa.At last, at step S640, wireless transmission interface uses s the antenna signal that it is received to be carried to radio channel.
Fig. 7 is the process flow diagram of the power control method that is used for wireless transmission interface that provides of another embodiment of the present invention.The method that Fig. 7 provides is only one of them embodiment of said method, is not to limit the present invention.In Fig. 7, suppose that the modulation mode adopts 256 QAM of OFDM, and the video signal form may be VGA or HDMI.Wherein when the video signal form was VGA, the video signal data that has 30 720 of per seconds * 720 pixel pictures (720P@30fps) was transmitted; When the video signal form was HDMI, the video signal data that has 30 1080 of per seconds * 1080 pixel pictures (1080P@30fps) was transmitted.In addition, the method that the embodiment of Fig. 7 provides is the wireless transmission interface 30 for Fig. 3, but the present invention is not limited to this.
At first, in step S710, input end interface converts video signal data to video signal, and the signal format of this video signal is the corresponding signal format of video signal form of input end interface standard.Then, judgement video signal form is VGA or HDMI in step S720.If the video signal form is VGA, execution in step S730, wireless transmission interface 30 determines to transmit video signal data with two antennas 360 and 364; If the video signal form is HDMI, execution in step S740, wireless transmission interface 30 determines to transmit video signal data with whole antenna 360,362,364,366.
Then, in step S750, check that the local side device is to adopt internal cell or external electric supply installation to power at present.If the local side device is to adopt external electric supply installation to power at present, in execution in step S760, the corresponding amplifier circuit of the antenna that uses is opened, and controlled corresponding switch and present open-circuit condition.For example, suppose that the video signal form is HDMI, in step S760, amplifier circuit 340,342,344 and 346 can be unlocked, and switch 380,382,384 and 386 is understood controlled signals control and present open-circuit condition.If the local side device is to adopt internal cell to power at present, in execution in step S770, will determines that the corresponding amplifier circuit of antenna that uses closes, and control corresponding switch and present open-circuit condition.For example, suppose that the video signal form is HDMI, in step S770, amplifier circuit 340,342,344 and 346 can be closed, and switch 380,382,384 and 386 is understood controlled signals control and present short-circuit condition.At last, in step S780, the antenna that the uses signal that it is received is carried to radio channel.
Then, please refer to Fig. 8, Fig. 8 is the process flow diagram of the power control method that is used for wireless transmission interface that provides of another embodiment of the present invention.The method that Fig. 8 provides is only one of them embodiment of said method, is not to limit the present invention.In Fig. 8, suppose that the modulation mode adopts 256 QAM of OFDM, and the video signal form may be VGA or HDMI.Wherein when the video signal form was VGA, the video signal data that has 30 720 of per seconds * 720 pixel pictures (720P@30fps) was transmitted; When the video signal form was HDMI, the video signal data that has 30 1080 of per seconds * 1080 pixel pictures (1080P@30fps) was transmitted.In addition, the method that the embodiment of Fig. 8 provides is the wireless transmission interface 40 for Fig. 4, but the present invention is not limited to this.
At first, in step S810, input end interface converts video signal data to video signal, and the signal format of this video signal is the corresponding signal format of video signal form of input end interface standard.Then, judgement video signal form is VGA or HDMI in step S820.If the video signal form is VGA, execution in step S830, wireless transmission interface 30 determines to transmit video signal data with two antennas 460 and 464; If the video signal form is HDMI, execution in step S840, wireless transmission interface 40 determines to transmit video signal data with whole antenna 460,462,464,466.
Then, in step S850, check that the local side device is to adopt internal cell or external electric supply installation to power at present.If the local side device is to adopt external electric supply installation to power at present, in execution in step S860, the corresponding amplifier circuit of the antenna that uses is opened, and increased the gain of the corresponding amplifier circuit of antenna that uses by adjusting its corresponding variable resistor.For example, suppose that the video signal form is VGA, in step S860, amplifier circuit 440 and 444 can be unlocked, and variable resistor 480 and 484 can be adjusted, to increase the gain of amplifier circuit 440 and 444.If the local side device is to adopt internal cell to power at present, in execution in step S870, the corresponding amplifier circuit of the antenna that uses is opened, and reduced the gain of the corresponding amplifier circuit of antenna that uses by adjusting its corresponding variable resistor.For example, suppose that the video signal form is VGA, in step S870, amplifier circuit 440 and 444 can be unlocked, and variable resistor 480 and 484 can be adjusted, with the gain of step-down amplifier circuit 440 and 444.At last, in step S880, the antenna that the uses signal that it is received is carried to radio channel.
The wireless transmission interface that the embodiment of the present invention provides and power control method thereof can allow the computer or the mobile device that adopt the method and wireless transmission interface video signal data can be transmitted the meter displaying device broadcast, simultaneously, the number of antennas that this wireless transmission interface uses, amplifier gain all can be controlled by multiple different parameter from the switch of amplifier, make computer or mobile device save the electric power that consumes and can reach, can allow again the user view and admire by meter displaying device the video signal that computer or mobile device are play, to enjoy the high image quality video signal.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. one kind in order to transmit the wireless transmission interface of video signal, comprising:
One input end interface is given a video signal data of a meter displaying device in order to receive local side device institute tendency to develop, and is exported accordingly a video signal;
One transceiving chip group has an input end in order to receive this video signal, has x modulating signal output terminal;
X amplifier circuit, each amplifier circuit have an input end and an output terminal, and this input end of each amplifier circuit is coupled to one of them of this x modulating signal output terminal;
X antenna, each antenna are coupled to one of them of this x output terminal of this x amplifier circuit; And
one control circuit, a signal format corresponding according to this video signal, one modulation mode, one video pictures resolution, one power status of this local side device, one channel transfer Q factor, one user's control signal or a back coupling control signal are controlled this transceiving chip group this video signal are carried out a signal processing, to produce y modulating signal to y modulating signal output terminal, and this control circuit this signal format corresponding according to this video signal, this modulation mode, this video pictures resolution, this power status of this local side device, this channel transfer Q factor, this user's control signal maybe is somebody's turn to do the switch that the back coupling control signal is controlled y corresponding this y amplifier circuit of modulating signal output terminal, and use this y of antenna transmission modulating signal to a radio channel corresponding to this y amplifier circuit, wherein y is less than or equal to x, and greater than 0.
2. wireless transmission interface according to claim 1, wherein this control circuit also signal format corresponding according to this video signal, this modulation mode, this video pictures resolution, this local side device this power status, this channel transfer Q factor, this user's control signal maybe this back coupling control signal control the gain of the more than one amplifier circuit of opening in this y amplifier circuit.
3. wireless transmission interface according to claim 1, also comprise x switch, wherein the two ends of each switch are coupled to output terminal and the input end of corresponding amplifier circuit, controlled by this control circuit when this switch and during short circuit, its corresponding amplifier circuit that connects controlled and close by this control circuit.
4. wireless transmission interface according to claim 1, also comprise x variable resistor, wherein each variable-resistance two ends is coupled to output terminal and the input end of corresponding amplifier circuit, this control circuit also signal format corresponding according to video signal, this modulation mode, this video pictures resolution, this local side device this power status, this channel transfer Q factor, this user's control signal maybe this back coupling control signal control each variable-resistance resistance value.
5. wireless transmission interface according to claim 1, wherein this wireless transmission interface is estimated this channel transfer Q factor, this control circuit is adjusted the gain of this y amplifier circuit according to this channel transfer Q factor, perhaps control the switch of this y corresponding this y amplifier circuit of modulating signal output terminal, and use this y of antenna transmission modulating signal corresponding to this y amplifier circuit to this radio channel, wherein this channel transfer Q factor comprises a bit error rate or a package Loss Rate.
6. the local side device with computing power and ability to communicate, in order to send a video signal data to a meter displaying device, have a wireless transmission interface, and this wireless transmission interface comprises:
One input end interface is given a video signal data of a meter displaying device in order to receive local side device institute tendency to develop, and is exported accordingly a video signal;
One transceiving chip group has an input end in order to receive this video signal, has x modulating signal output terminal;
X amplifier circuit, each amplifier circuit have an input end and an output terminal, and this input end of each amplifier circuit is coupled to one of them of this x modulating signal output terminal;
X antenna, each antenna are coupled to one of them of this x output terminal of this x amplifier circuit; And
one control circuit, a signal format corresponding according to this video signal, one modulation mode, one video pictures resolution, one power status of this local side device, one channel transfer Q factor, one user's control signal or a back coupling control signal are controlled this transceiving chip group this video signal are carried out a signal processing, to produce y modulating signal to y modulating signal output terminal, and this control circuit this signal format corresponding according to this video signal, this modulation mode, this video pictures resolution, this power status of this local side device, this channel transfer Q factor, this user's control signal maybe is somebody's turn to do the switch that the back coupling control signal is controlled y corresponding this y amplifier circuit of modulating signal output terminal, and use this y of antenna transmission modulating signal to a radio channel corresponding to this y amplifier circuit, wherein y is less than or equal to x, and greater than 0.
7. local side device according to claim 6, wherein this control circuit signal format corresponding according to this video signal, this modulation mode and video pictures resolution determine that minimum antenna uses number s, wherein s is greater than 0, and s is less than or equal to y.
8. local side device according to claim 6, wherein this wireless transmission interface also comprises x variable resistor, wherein each variable-resistance two ends is coupled to output terminal and the input end of corresponding amplifier circuit, and this power status of this control circuit signal format corresponding according to this video signal, this modulation mode, this video pictures resolution, this local side device, this channel transfer Q factor, this user's control signal maybe this back coupling control signal are controlled each variable-resistance resistance value.
9. local side device according to claim 6, wherein this wireless transmission interface is estimated this channel transfer Q factor, this control circuit is adjusted the gain of this y amplifier circuit according to this channel transfer Q factor, perhaps control the switch of this y corresponding this y amplifier circuit of modulating signal output terminal, and use this y of antenna transmission modulating signal corresponding to this y amplifier circuit to this radio channel, wherein this channel transfer Q factor comprises a bit error rate or a package Loss Rate.
10. power control method that is used for wireless transmission interface, this wireless transmission interface is sent to a meter displaying device in order to the video signal data with a local side device, wherein this local side device has x transmission path, each transmission path has an antenna and an amplifier circuit, and this power control method comprises:
Convert this video signal data to a video signal;
Determine that according to a signal format, a video pictures resolution and a modulation mode of this video signal minimum antenna uses number s;
Determine that according to a power status, a channel transfer Q factor, user's control signal or a back coupling control signal of this local side device antenna uses number y, and this video signal is carried out signal process, to produce y modulating signal to y antenna;
The resolution of this signal format corresponding according to this video signal, this modulation mode, this video pictures, this power status of this local side device, this channel transfer Q factor, this user's control signal maybe this back coupling control signal are controlled switch or the gain of corresponding this y amplifier circuit of this y antenna; And
Use this y antenna signal that it is received to be carried to a radio channel, wherein more than or equal to s, and y is less than or equal to x greater than 0, y for s.
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| CN 200910220806 CN102053659B (en) | 2009-11-06 | 2009-11-06 | Wireless transmission interface for transmitting video signals and power control method thereof |
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| CN 200910220806 CN102053659B (en) | 2009-11-06 | 2009-11-06 | Wireless transmission interface for transmitting video signals and power control method thereof |
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| CN102053659B true CN102053659B (en) | 2013-05-22 |
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Citations (3)
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| WO1994018718A1 (en) * | 1993-02-05 | 1994-08-18 | Grumman Aerospace Corporation | Portable antenna test apparatus |
| CN101159465A (en) * | 2006-09-27 | 2008-04-09 | 美国博通公司 | RF emitter, RF transceiver and rf front-end |
| CN201114507Y (en) * | 2007-09-20 | 2008-09-10 | 厦门华侨电子股份有限公司 | A wireless digital high-definition interface device without compression |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994018718A1 (en) * | 1993-02-05 | 1994-08-18 | Grumman Aerospace Corporation | Portable antenna test apparatus |
| CN101159465A (en) * | 2006-09-27 | 2008-04-09 | 美国博通公司 | RF emitter, RF transceiver and rf front-end |
| CN201114507Y (en) * | 2007-09-20 | 2008-09-10 | 厦门华侨电子股份有限公司 | A wireless digital high-definition interface device without compression |
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