CN100592281C

CN100592281C - Method and system for wireless transmission

Info

Publication number: CN100592281C
Application number: CN200580038163.8A
Authority: CN
Inventors: R·A·昂格尔
Original assignee: Sony Electronics Inc
Current assignee: Sony Electronics Inc
Priority date: 2004-11-03
Filing date: 2005-10-13
Publication date: 2010-02-24
Anticipated expiration: 2025-10-13
Also published as: CN100511414C; CN101133406A; CN101053011A

Abstract

Multimedia from a source can be wirelessly transmitted in an infrared system to a display. To support rapid reads of data written into a slave at the display by a master at the source in accordance with I<SUP>2</SUP>C protocol, a master simulator on the display side continually polls the slave for changes, and maintains a shadow memory in a slave simulator at the source side current, so that readsfrom the master may be immediately executed from the shadow memory in the slave simulator without transitting the wireless link.

Description

The method and system of wireless transmission

I. invention field

The present invention relates generally to wireless multimedia transmission system.

II. background of invention

Digital video can be called the agreement of digital visual interface (DVI) from being sent to such as displays such as dull and stereotyped video monitors such as sources such as DVD player, video receiver, ATSC tuner or other computing machines by use.DVI mainly develops and is used for computing machine, unexpected processing audio data.

Therefore, for example play digital movie and like that with realization, developed the agreement that is called HDMI (High Definition Multimedia Interface) (HDMI) for communication protocol being expanded to the digital multimedia that comprises audio frequency.HDMI is similar to DVI, but it has estimated use audio frequency and video data, and it has increased and TV-related resolution.DVI and HDMI all are intended to be used for wire transmission, and HDMI also allows to use the encryption method that is called HDCP (HDCP) that digital multimedia is encrypted.DVI also supports the HDCP as optional feature.

The same just as used herein appreciated, for saving table space and increasing the movability of indoor occupant and watch circuit, may wish to use minimum being routed in to watch multimedia on the display.For example, because as this paper understands, among others, in ceiling or wall, often there is not data transmission link, therefore, may wish on ceiling, to install projector, plasma scope or liquid crystal high definition (HD) television indicator perhaps is installed on the wall, can not hinder action also can be used for showing and need not cable by receiving multimedia data.

Yet the present invention also understands, and is not the so operation of arbitrary wireless transmitting system.Particularly, if use such as IEEE 802.11 (b) equiband and be not enough to carrying compression or unpressed multimedia Radio Link, such as unpressed high definition (HD) video, then must transmit multimedia standardization sharpness (SD) video of compression, this requires to install relatively more expensive decompression module on projector.The sufficiently high bandwidth of the HD video that waits some links to have really can to carry compression such as IEEE 802.11 (a), but can't carry unpressed SD or HD video.In addition, under the situation of using 802.11 (a), may involve copyright protection, this is the range long enough (from its indoor outside that extends to of starting) because of link, thereby can detect it outside the close position of emission laptop computer.In view of this, the present invention recognizes needs extremely short, the directed high bandwidth wireless link preferably of a kind of range, and this link is specially adapted to unpressed multimedia short-distance radio transmission, particularly is called this quite huge multimedia of HD video.

This assignee provides a kind of wireless system in operation in the frequency spectrum (hereinafter referred to as " 60GHz frequency band ") of 57GHz and 64GHz.The feature of 60GHz frequency spectrum comprises short range, high directionality (and the inherent safety that therefore brings) and big data bandwidth.The U.S. Patent application 10/666724,10/744903 (system), 10/893819,11/136199 (invention relevant with PLL) of this assignee's common pending trial and 11/035845 (many antennas) disclose the 60GHz link that uses high bandwidth high definition (HD) video of HDMI (High Definition Multimedia Interface) (HDMI) form has been sent to the various system and methods of indoor receiver from indoor sources, and all these patented claims are all incorporated herein by reference.In this frequency, signal has extremely short range and can be directed so that video can transmit with unpressed form, and like this, per second transmits so many data, thereby does not support bootlegging (bootleg) content in fact.

Regardless of special application, the present invention has drawn following significant observation.As herein understood, essential sometimes is that the master component in the data source (as microcontroller) is used such as being called " I ²C " appropriate protocol such as agreement reads information and is written into subordinate assembly (as register) in the display to realize the control purpose.Generally speaking, master control writes register position and reading of data therefrom in the subordinate with data, and can use several subordinates, has its oneself address separately.For example, may be essential be that the master control in the source is with the one or more subordinates that may the security information relevant with above-mentioned HDCP write in the display.

As further understood herein, wish that reading and writing between master control and the subordinate is close to generation in real time, particularly under the situation of the necessary encrypted key exchange of supporting just playing of decryption of video.The present invention importantly recognizes, in wireless application, and particularly when in wireless application, realizing reading, this is a difficult problem, this is because the request of reading must be through the Radio Link transmission of master control to subordinate of associating, work, Qing Qiu data are returned master control by link from subordinate then, and this may bring unnecessary waiting time.

Summary of the invention

A kind of multi-media display system comprises multi-medium data origin system and multi-medium data display system.Display system comprises display, and origin system uses optical communication system to intercom mutually with wireless mode with display system.Origin system has the master control that data is write the subordinate in the display system.The subordinate emulator is in origin system, and the subordinate that write by master control of reflection, so that can be met from the subordinate emulator from the read command of master control.

Master simulator can provide in display system, communicates by letter with subordinate to use the change in the subordinate to upgrade the subordinate emulator.For this reason, first shadow memory can provide in the subordinate emulator, and second shadow memory can provide in master simulator, master simulator is operated in automatic loop circuit so that the data in the data in the subordinate and second shadow memory are compared, and upgrades first shadow memory based on the comparison.

In non-limiting enforcement, multimedia can be digital visual interface (DVI) multimedia and/or HDMI (High Definition Multimedia Interface) (HDMI) multimedia.Radio Link can be in infrared band.Can between master control and subordinate, use I ²The C agreement transmits data.

On the other hand, a kind of being used for using Radio Link and origin system to carry out that demonstration comprises being used for and will helping to show the parts that write the subordinate on the display system from the multimedia information of the master control on the origin system from the multimedia system of origin system on the display system of Infrared Wireless Communication.System also comprises the parts that are used for satisfying subsequently from the read command of master control, the subordinate emulator reading of data from the origin system and do not send read command by Radio Link.

Still having on the other hand, a kind of multimedia method that on display, shows from the source, comprise and use the infrared radio link multimedia to be sent to display from the source, and use Radio Link that data are write subordinate on the display from the master control on the source with wireless mode.Method comprises also whether the periodic polling subordinate has change.All changes are sent at least one shadow memory on the source by Radio Link, thus the content of shadow memory reflection subordinate.Directly carry out from master control, the read command that is addressed to subordinate from shadow memory.

With reference to accompanying drawing, can understand details of the present invention in structure of the present invention and operating aspect best, similar label is represented similar parts in the accompanying drawing, and wherein:

The accompanying drawing summary

Fig. 1 is the block scheme that the non-restrictive illustrative enforcement of native system is shown;

Fig. 2 is the block scheme of master component and subordinate assembly;

Fig. 3 is a process flow diagram of writing logic;

Fig. 4 is a process flow diagram of reading ready logic; And

Fig. 5-7 is to use the block scheme of transmitter and receiver of the alternative transmitter of light transmission.

Preferred embodiment describes in detail

With reference to Fig. 1, it shows 10 the system that is typically expressed as earlier, and this system comprises base band multi-medium data source 12, and particularly, this base band multi-medium data is high definition (HD) digital video that has audio frequency.Source 12 can be laptop computer or other multimedia computer or server.Perhaps, it can be satellite, broadcasting or wire receiver, and perhaps it can be DVD player or other multimedia sources, as video receiver, ATSC tuner or other computing machine.

Source 12 sends to medium receiver 16 by circuit 14 with multiplexing multi-medium data.Medium receiver 16 can be for comprising the set-top box of HDMI (High Definition Multimedia Interface) (HDMI) transmitter 18.HDMI transmitter 18 adopts the HDMI agreement by use HDCP (HDCP) data encryption and support are handled multi-medium data such as the TV resolution of multi-medium datas such as 16 * 9 displaying ratios except that other operation.

HDMI transmitter 18 can send to digital visual interface (DVI) receiver 20 with the multi-medium data that HDCP encrypts by cable or other cable 19.According to the present invention, DVI receiver 20 uses DVI protocol processes data accepted.As a part of handling, HDMI transmitter 18 multiplexing videos, and the audio frequency in the multiplexing video data stream.This can be by finishing audio-frequency multiplex in the vertical blanking interval (VBI) of video, perhaps it can be finished by the back edge of use clock signal or by alternate manner.DVI receiver 20 is with the video demultiplexing, simultaneously by multiplexing audio frequency in the data stream.Under arbitrary situation, DVI receiver 20 never needs the stream deciphering or encrypts.

To send to processor 22 from the multi-medium data of the encryption of VBI receiver 20, as special IC (ASIC) or field programmable gate array (FPGA).Processor 22 deal with data are to carry out wireless transmission by transmitting set 24 by emitting antenna 26.Except that other operation, processor 22 can be multiplexed with the video and the control signal of 24 circuits that may exist such as two signals supporting that QPSK modulates may be needed again on 24 multiplexing lines 28.The additional control signal that is used for display also can be multiplexing in video data stream.In addition, according to the known wireless transmission principles of technical field, can implement the error correction suitable to wireless transmission.In the above-mentioned provisional application of quoting incorporated herein by reference, can find the details of non-limiting processor.

Under arbitrary situation, by Radio Link 30 multi-medium data of encrypting is sent to receiver antenna 32 with wireless mode, and this antenna sends to wireless receiver 34 with data.According to existing principle, the frequency of link 30 carryings is enough high, and therefore, in fact the signal on the link can't receive outdoor.In addition, can transmit multimedia with unpressed form on link 30, like this, per second transmits so many data, thereby does not support the bootlegging content in fact, although may not too preferably implement certain data compression.Data also can transmit with the form of compression when needing.Therefore transmitter 24 and receiver 34 (and also have link 30) are preferably in about 60 kilo-mega cycles per seconds (60GHz) and more preferably be (not change at the fixing of 59GHz-64GHz scope, only single) operate on the frequency, and link 30 has and is preferably data transfer rates fixing, per second at least two gigabits (2.0Gbps).When using DQPSK, data transfer rate can be 2.2Gbps, and link can have the data transfer rate of about 2.5Gbps.Link can have the fixed-bandwidth of 2.5 kilo-mega cycles per seconds (2.5GHz).

In view of this, can understand transmitting set 24 now and preferably include the scrambler of encoding according to the technical field known principle.Coded data by upconverter modulation and up-conversion with by in approximately link 30 transmission of 60GHz.Use above-mentioned wide channels and, can realize the data transfer rate height but simple system such as, but not limited to simpler modulation schemes such as DQPSK, QPSK, BPSK or 8-PSK.For example, when using DQPSK, can realize doubling the data transfer rate of symbol rate.For 8-PSK, can realize the data transfer rate of 3.3Gbps.

It can also be appreciated that wireless receiver 34 comprises the circuit with transmitting set 24 complementations, that is, and low-converter, detuner and demoder.Under arbitrary situation, will send to processor 36 from the data of wireless receiver 34 carrying out error correction and multiplexing again, thereby be suitable for using by DVI transmitter 38.Processor 36 can also be in the time may needing will be used for all control signal demultiplexings of display in the video data.The details of non-limiting processor have statement in the above-mentioned provisional application of quoting.

DVI transmitter 38 is according to the known DVI operate of technical field, never it is deciphered to handle the multimedia of encrypting, and multi-medium data being sent to HDMI receiver 40 by cable or other cable 39, this receiver can be the part such as media players 42 such as DVD player or TV or other players.HDMI receiver 40 is deciphered multi-medium data according to the HDCP principle, and from video data with the voice data demultiplexing.Content of multimedia subsequently can be such as cathode ray tube (CRT), LCD (LCD), plasma display panel (PDP) or TFT or have on the displays such as projector 44 of screen and show.

According to the present invention, DVI receiver 20, processor 22 and transmitting set 24 can be included on single chip or the different substrate.In fact, DVI receiver 20, processor 22 and transmitting set 24 can be integrated in the medium receiver 16.Similarly, wireless receiver 34, processor 36 and DVI transmitter 38 may be implemented on the single chip, and can be integrated in the media player 42 when needed.Under arbitrary situation, owing to can't penetrate the wireless transmission frequency of the preferred 60GHz of body of wall, medium receiver 16 and media player 42 and corresponding assembly are preferably the coexistence the same space.

Since shown in the non-limiting example, the DVI assembly uses in the wireless portion of the communication path between medium receiver 16 (for example, set-top box) and the media player 42 (for example, TV or DVD player), therefore, this part be need not encryption key (or licence of following).In addition since in the wireless portion of between DVI assembly 20,38, setting up from non-decrypting multimedia, therefore, involve include, a small amount of or do not have control and pay close attention to (regulatoryconcern).

Fig. 2 illustrates source component of the present invention and subordinate assembly.It being understood that source component can be implemented by source processor for example 22, and the subordinate assembly can be that the processor 36 of receiver is implemented by for example place.

Source component comprises can be by the master control 46 of suitable microcontroller enforcement.Master control 48 is communicated by letter with the subordinate emulator 48 that comprises master-side shadow memory 50 by cable, and this storer can be implemented by for example two-port RAM.Subordinate emulator 48 is communicated by letter with master simulator 54 by Radio Link 52 (as above-mentioned Radio Link) again, and master simulator 54 has subordinate end shadow memory 56 and the logic 58 of carrying out following method.Master simulator 54 is communicated by letter with subordinate 60 by cable, will be understood that master simulator 54 is identical with master control 46 in logic basically, and subordinate emulator 48 is identical with subordinate 60 in logic basically.Master simulator 54 can be implemented by microcontroller, and subordinate emulator 48 and subordinate 60 can be accepted the read and write order in the register position.For example, security information such as, but not limited to encryption key can use following logic to write subordinate 60 by master control, and can read from subordinate 60 by master control 46, the information in the subordinate 60 can be used for the multimedia of oblatio from source 12 by above-mentioned receiver (subordinate end) assembly.Correspondingly, the content in the register of shadow memory 50,56 reflection subordinates 60.

Fig. 3 illustrates the logic of writing of the present invention.At square frame 62, a string bit is concluded in master control 46, and this string bit provides address, subaddressing (for example, the subaddressing of the register that will use in the subordinate 60) and the data byte of the subordinate 60 that will use.This information is hunted down, wraps in the wireless protocols by appropriate signals exchange and by subordinate emulator 48, send to subordinate end master simulator 54 by Radio Link 52.At square frame 66, write order is received by master simulator 54, and at square frame 68, write order is carried out by data being write subordinate 60.The data that write at first can reading in master simulator 54 execution graphs 4 be stored in the shadow memory 50,56 before the ready logic when needed.Under arbitrary situation, after being accomplished to the writing of subordinate 60, receiver end (place) assembly is according to for example above-mentioned I ²The C agreement write principle, confirm to write to finish to source transmitter (source) end.

The same just as used herein appreciated, master control 46 expections are in fact directly made response to read command, and the time may be not enough to by Radio Link transmission read request and receive reply.This is the problem that shadow memory described herein and emulator solve.More specifically, referring now to Fig. 4, owing to the information in the subordinate 60 may be changed because of a variety of causes, therefore, it is current that master simulator 54 remains shadow memory 50,56 by regular execution in the logic of square frame 70, wherein, judge diamond 72 read in the subordinate 60 register and with its with the shadow memory 56 of master simulator 54 in the corresponding data that reflects compare.If data are identical, then logic box is got back to square frame 70 next register with test subordinate 60.

Yet when detecting change in subordinate 60, logic at this square frame, is upgraded the shadow memory 56 of master simulator 54 from judging that diamond 72 moves on to square frame 74.Proceed to square frame 76, master simulator 54 sends to subordinate emulator 48 with renewal, thereby upgrades shadow memory 50.With easy to understand, if read command is sent in master control 46 subsequently, then directly carry out it from subordinate emulator 48, this subordinate emulator returns response to master control 46, and order and response needn't be passed through Radio Link 52.Between master control 46 and subordinate emulator 48, kept the institute protocols having regularly, therefore, In the view of master control 46 it as if in visit subordinate 60.

The poll logic of Fig. 4 can by poll travel through all possible subaddressing of subordinate 60 or only the poll subaddressing or its a certain combination that are known as easy mistake implement.Therefore, in some implementations, can recognize position in the subordinate 60 that master control 46 pays close attention in the address of reading which subordinate 60 by observing master control 46 by master simulator 54, but and specific polling or just than these positions of poll more continually, other position.In addition, above-mentioned logic can expand to a more than data type and/or device, for example, expanded display recognition data in the DVI display (EDID) and HDCP key change and other data can use above-mentioned logic to write and read, and all these all can be supported.

Above-mentioned logic can be carried out by one or more processors herein, and all these are the non-limitative example of the various parts that satisfy the read-write requests from the master control to the subordinate.

Can use transmitter 24 shown in the optical transmission principles alternate figures 1 and receiver 34 and not use 60GHz.Fig. 5-7 illustrates this type of alternate embodiment, wherein, has in the enforcement of infrared energy of the data of seeking to transmit at launching code, and transmitting set is an optical sender.

As shown in Figure 5, transmitter 200 is from data source 110 receiving video signals.Transmitter 200 can comprise DVI/HDMI receiver 210, transmitter circuitry 220, system clock 230 and transmitter electro-optical interface 240.Though in one embodiment, data source 110 is HDMI or DVI video source (for example, ATSC tuner, DVD player etc.), and it can be the data source of another type similarly, source 12 as shown in Figure 1.

As shown in Figure 5, data source 110 is provided to DVI/HDMI receiver 210 with digital signal.DVI/HDMI receiver 210 can be used for the DVI/HDMI digital signal from data source 110 is converted to digital video signal, as the RGB of 24 bits.In another embodiment, DVI/HDMI receiver 210 and transmitter circuitry 220 are capable of being combined in single logical circuit.Though in one embodiment, transmitter circuitry 220 can be field programmable gate array (FPGA) or special IC (ASIC), and it can have other enforcement similarly.These elements are can be in fact identical with counter element among top Fig. 1-4, but what use is the transmission of light transmission rather than 60GHz.

Another input of transmitter circuitry 220 derives from the system clock 230 that clock signal is provided.In one embodiment, this clock signal signal that is 110MHz.The output of transmitter circuitry 220 is to transmitter electro-optical interface 240.

Fig. 6 illustrates from the photoreceiver 250 of optical sender 200 receiving optical signals.Receiver 250 can comprise receiver electro optical interface 260, receiving circuit 270, phaselocked loop (PLL) 280, DVI/HDMI transmitter 290 and system clock 300.Photoreceiver 250 also is shown video data is outputed to display device 150.Though in one embodiment, the digital of digital video data that outputs to display device 150 is one of HDMI and DVI data, and it can be the data of another type similarly.Except that using light-receiving, receiver 250 can be identical with the receiver shown in Fig. 1-4 in fact.

Correspondingly, as shown in Figure 6, photoreceiver 250 can comprise DVI/HDMI transmitter 290.In another embodiment, DVI/HDMI transmitter 290 and receiver circuit 270 are capable of being combined in single logical circuit.As mentioned above, another input of receiver circuit 270 derives from the system clock 300 that clock signal is provided.In one embodiment, this clock signal signal that is 110MHz.Transmitter circuitry 270 also is shown with PLL 280 and communicates by letter, and this can be used for helping to regenerate the video clock of DVI/HDMI transmitter 290.

Referring now to Fig. 7, it shows the block scheme of an embodiment of electric lighting system 500, and this system comprises the emission electro optical interface 240 of the Fig. 5 that communicates by letter with the reception electro optical interface 260 of Fig. 6.In this embodiment, emission electro optical interface 240 provides by receiving the light signal 550 that electro optical interface 260 receives.In this embodiment, radiating circuit 220 is provided to laser driver 510 with the vision signal of digital electric signal form, and this driver is generated to a series of electromotive forces of laser diode 520 again.This electromotive force sequence is used for conversion of signals is become light signal 550 by laser diode 520.In addition, collimation lens 530 can be used for light signal 550 is focused on, and it can correctly receive by receiving electro optical interface 260 like this.

Condenser lens 540 can be used for catching light signal 550 and it is focused on the photodiode 560.Photodiode 560 receiving optical signals 550 also convert thereof into digital electric signal, and this digital electric signal can be delivered to transimpedance amplifier 570 subsequently, is delivered to limiting amplifier 580 subsequently again.

Though as shown here and special " method and system of wireless transmission " that describe in detail can realize above-mentioned purpose of the present invention fully, but be appreciated that, it is the theme of introducing the present preferred embodiment of the present invention and therefore representing the present invention broadly to consider, scope of the present invention contains other embodiment that those skilled in the art can understand fully, and the scope of the present invention claims of correspondingly only being enclosed limit, wherein, unless offer some clarification on, otherwise quoting of the key element of singulative is not intended to expression " and have only ", but " one or more ".Device or method needn't be devoted to seek each problem of being solved by the present invention, because it will be contained by these claims.In addition, no matter whether clearly mention key element, assembly or method step in claims, the key element in the present disclosure, assembly or method step are not intended to be exclusively used in the public.Unless use phrase " be used for ... parts " key element of clear and definite described article claim, perhaps under the situation of claim to a method, key element is expressed as " step " rather than " action ", otherwise the key element of this paper claim should not explained according to the regulation of the 6th section of 35U.S.C.112.Though do not have clearly definition herein, the claim item should be endowed and this instructions and reconcilable all the common and general implications of file history.

Claims

1. multi-media display system comprises:

The multi-medium data origin system;

Multi-medium data display system, described display system comprise display (44,150), and described origin system uses optical communication system (200,250) to intercom mutually with wireless mode with display system;

Described origin system has at least one master control (46) that data is write at least one subordinate (60) in the described display system;

At least one subordinate emulator (48), it is in the described origin system, utilizes the change in the described subordinate to upgrade by Radio Link, to reflect at least a portion content of the described subordinate (60) that is write by described master control (46); Carry out read command by described subordinate emulator (48) from described master control (46).

2. the system as claimed in claim 1 is included in the described display system and communicates by letter with described subordinate (60) to utilize change in the described subordinate (60) to upgrade at least one master simulator (54) of described subordinate emulator (48).

3. system as claimed in claim 2, be included in first shadow memory (50) in the described subordinate emulator (48) and second shadow memory (56) in described master simulator (54), described master simulator (54) is operated in automatic loop circuit so that the data in data in the described subordinate (60) and described second shadow memory (56) are compared, and based on described described first shadow memory (50) that relatively upgrades.

4. the system as claimed in claim 1, wherein, described multimedia is for one of following at least: digital visual interface multimedia and HDMI (High Definition Multimedia Interface) multimedia.

5. system as claimed in claim 4, wherein, described optical communication system (200,250) is operated in infrared band.

6. the system as claimed in claim 1 wherein, is used I to small part between described master control (46) and described subordinate (60) ²The C agreement transmits data.

7. one kind shows the multimedia method from source (12,110) on display (44,150), comprising:

(12,110) are sent to described display (44,150) from described source with described multimedia with wireless mode to use the infrared radio link;

Use Radio Link (52) that data are write subordinate (60) on the described display (44,150) from the master control (46) on the described source;

Whether the described subordinate of periodic polling (60) has change;

By described Radio Link (52) described change is sent at least one shadow memory (50) on the described source, thereby described shadow memory (50) reflects the content of described subordinate (60); And

Directly carry out from described master control (46), be addressed to the read command of described subordinate (60) by the subordinate emulator (48) in described source (12,110).