CN1802809A

CN1802809A - Radio communication device, radio communication system, wireless AV system, radio transmission method, operation control program, and recording medium containing the program

Info

Publication number: CN1802809A
Application number: CN 200480013961
Authority: CN
Inventors: 中田昌志; 地白崇文
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2003-05-21
Filing date: 2004-04-19
Publication date: 2006-07-12
Anticipated expiration: 2024-04-19
Also published as: CN100518036C

Abstract

A radio communication system according to the present invention includes a video/audio transmitter ( 1 ) and a video/audio receiver ( 2 ) for transmission/reception of data including video data and audio data at a predetermined bit rate. The video/audio receiver ( 2 ) has an error information generation section ( 18 ) for detecting a communication state according to a signal from the video/audio transmitter ( 1 ). The video/audio transmitter ( 1 ) has a transmission section ( 6 ) for transmitting data while controlling to change the bit rate according to the communication state detected by the video/audio receiver ( 2 ). Unless the communication state satisfies a predetermined criterion, the transmission section ( 6 ) temporarily lowers the bit rate for transmitting the data to the video/audio receiver ( 2 ). Thus, even when the communication state deteriorates, it is possible to minimize deterioration of the video and audio data and transmit data without lowering the quality of the entire video and audio transmitted.

Description

Radio communication device, wireless communication system, Wireless AV system, wireless transmission method and operation control program and write down this program recording medium

Technical field

The present invention relates to radio communication device, wireless communication system, Wireless AV system, wireless transmission method and operation control program and write down this program recording medium.

Background technology

Along with the fulminant of the Internet popularized, in office, the situation of constructing LAN (local area network (LAN)) in the family constantly increases in recent years.Also because the digital wireless communication development of technology, the trouble of cable wiring, demand with wireless so-called WLAN of constructing LAN is also very surging, but also because the use under the mobile environment of the portable terminal of notebook personal computer representative is possible, expectation has the universal platform number of quite big quantity in the future.

As the representational technology of WLAN, at the existing normalized IEEE802.11 of IEEE.The physical layer of this normalized technical stipulation from osi model is MAC (medium access control) layer to the low level layer of data chainning, replaceable is the Ethernet (registered trade mark) that transmits the road as wired lan, although be wireless, also becoming to provide the standard of roaming function as additional function.

In addition, even in the family, also increase the utilization of wireless transfer equipment, the video signal system of so-called video and sound is digitized, utilizes wirelessly, sends to movably receiver from fixing transmitter and implements audiovisual and increasing.On the other hand, be restricted owing to exempt to demonstrate,prove the frequency band of use, the mutual obstruction between wireless device or electromagnetic wave transmitter also increases, and when making wireless device, how to tackle the wireless device that comes from the outside or the obstruction of electromagnetic wave transmitter, becomes important.

As hindering countermeasure, Patent Document 1 (spy opens flat 7-283757 communique (nineteen ninety-fives 10 labourer hired by the month disclosed on the 27th)) has disclosed, in the compression of the variable bit rate of sound, even the noise in the reception environment increases, the voice data communicator of the discarded probability of the reception data that also can reduction factor cause according to error.

Figure 12 illustrates the pie graph of Patent Document 1 described voice data communicator.

Among Figure 12, among the voice data receiving system 201A of the voice data that reception voice data transmission device 200 sends, utilize CRC (cyclic redundancy check (CRC)) position determinant 201E to detect the error that receives data, error rate according to error rate determinant 201F judgement, send Indication message maker 201G generate to specify the data compression rate of transmitter side again and send the message of number of times again, send to voice data transmission device 200.Receive this data,,, generate compressed data packets, deposit data buffer in by CRC position maker 214 additional CRC positions with the compression ratio compression of encoder 213 indications.On the other hand, send 216 pairs in counter to utilize the number of times of message indication to count again,, be configured in and send to transmitter 219 in 1 frame only with the compressed data packets of this number of times sense data buffer 215.

Yet in such Wireless Telecom Equipment always, as compression method, owing to set variable bit rate, each packet that sends is necessary to change compression ratio and send number of times again according to error rate.Therefore, worsen during there is something special, be difficult to keep certain quality of data at communications status, the result, the video of transmission and sound oeverall quality just descend.

The present invention does in view of the above problems, its purpose is to provide and promptly makes under the situation that communications status worsens, can not reduce the video and the sound oeverall quality of transmission, the radio communication device that carries out data communication with the degradation inhibiting of video and voice data to Min. yet.

Summary of the invention

For solving above-mentioned problem, radio communication device of the present invention, bit rate with regulation transmits the data that comprise video and voice data, comprise: according to communications status detecting unit from the input communications status of transmit leg, and according to the detected communications status of described communications status detecting unit, control described bit rate changeably and transmit the data transfer unit of described data, when described data transfer unit does not satisfy the benchmark of regulation at detected communications status, temporary transient described bit rate, the transmission data of reducing.

Here, so-called communications status does not satisfy the benchmark of regulation, is to say if the words of video data, then most of users are watched communications status for the degree of feeling bad, in addition, if voice data, then most of users are listened to communications status for the degree of feeling bad.

In addition, when reducing bit rate, the quality of video or sound just descends, but as long as such video or the degree of sound when reducing bit rate and not satisfying stipulated standard less than above-mentioned communications status.

Therefore, data transfer unit transmits data by temporary transient reduction bit rate when not satisfying stipulated standard because of the communications status that detects, can suppress the Min. that corrupts to of video and voice data.

So, even the situation that communications status worsens, also with the degradation inhibiting of video and voice data to minimum limit, the result can not reduce the video and the overall quality of sound of transmission, carries out data communication.

In addition, also can be when the reduction bit rate carry out the data transmission, the detected communications status of communications status detecting unit satisfies the benchmark of regulation as described, and the level that then makes bit rate bring up to regulation transmits data.

So, can make deterioration video and voice data during be necessary Min..At this moment, as above-mentioned stipulated standard, can be the benchmark of bringing up to communication bit rate originally, also can be the benchmark of bringing up to the value lower than communication bit rate originally, in addition, also can be the benchmark of bringing up to the value higher than communication bit rate originally.

Can comprise also that also storage makes the set point memory cell of the set point of sending the number of times combination again of a plurality of bit rates and data, described data transfer unit is according to the communications status that detects, selection is stored in the set point in the described set point memory cell, transmits data with the bit rate of the set point correspondence selected with sending number of times again.

At this moment, even the high situation of the sort of data transmission error rate during the communications status very severe, as reducing bit rate, what increase data send number of times again, and data communication also is possible so.That is to say, bit rate that can transmit according to the degree set data of communications status and data send number of times again.Therefore can strengthen the error tolerance.

Also can described video and the voice data utilization transmit according to the mpeg stream of mpeg encoded mode.

Wireless communication system of the present invention is for solving above-mentioned problem, sending the transmitter and the receiver that receive the data that comprise video and voice data by the bit rate with regulation forms, described receiver comprises: judgement is from the error identifying unit of the error of the data of described transmitter reception, be sent to the control information delivery unit of described transmitter as control information with the error of described error identifying unit judgement, described transmitter comprises: according to the control information of described receiver transmission, detect the communications status detecting unit of communications status, when the communications status of described communications status detecting unit detection does not satisfy stipulated standard, temporarily reduce described bit rate transmits data to described receiver data transfer unit.

According to above-mentioned formation, even when communications status worsens, also can realize not reducing the video and the overall quality of sound of transmission, suppress the Min. that corrupts to of video and voice data, can carry out data communications system.

In addition, as above-mentioned radio communication device being applied to the Wireless AV system that connects by a plurality of networks, can realize so the minimal Wireless AV system of the degradation inhibiting of video and voice data.

Other purposes of the present invention, feature, and advantage by the following stated with fully aware of.Interests of the present invention in addition will be understood by the following explanation with reference to accompanying drawing.

Description of drawings

Fig. 1 is the figure of action summary that the radio communication device of the 1st example of the present invention is shown.

Fig. 2 illustrates the block diagram of the radio communication device formation of this example.

The wireless transfer rate that Fig. 3 illustrates the video/sound receivers side of the radio communication device of this example changes the flow chart of action.

The wireless transfer rate that Fig. 4 illustrates the video/sound receivers side of the radio communication device of this example changes the flow chart of action.

The wireless transfer rate that Fig. 5 illustrates the video/acoustic transmitter side of the radio communication device of this example changes the flow chart of action.

The wireless transfer rate that Fig. 6 illustrates the video/acoustic transmitter side of the radio communication device of the 2nd example of the present invention changes the flow chart of action.

Bit rate/the maximum of reference was sent the formation illustration of number of times again when Fig. 7 illustrated the video of the radio communication device of this example/voice data and sends.

The wireless transfer rate that Fig. 8 illustrates the video/acoustic transmitter side of the radio communication device of the 3rd example of the present invention changes the flow chart of action.

Fig. 9 illustrates the formation block diagram of radio communication device, transmitter, receiver and the Wireless AV system of the 4th example of the present invention.

Figure 10 illustrates the formation block diagram of wireless center of radio communication device, transmitter, receiver and the Wireless AV system of this example.

Figure 11 illustrates the formation block diagram of TV body of radio communication device, transmitter, receiver and the Wireless AV system of this example.

Figure 12 illustrates the pie graph of voice data communicator always.

The major part that Figure 13 illustrates the object lesson of the Wireless AV system that utilizes radio communication device of the present invention constitutes block diagram.

Embodiment

[example]

Below, the example of present invention will be described in detail with reference to the accompanying suitable radio communication device.

[example 1]

Illustrate that an example of the present invention is as follows.Fig. 1 illustrates the figure of action summary of the radio communication device of the 1st example of the present invention.

The radio communication device of this example, as shown in Figure 1, constitute by following part: the video/acoustic transmitter 1 that sends video/voice data, reception is from the video/sound receivers 2 of the video/voice data of video/acoustic transmitter, video/the voice data that transmits is supplied with the video source 3 of video/acoustic transmitter 1, show the display monitor central monitoring system 4 of the video/voice data that transmits.

Above-mentioned video/acoustic transmitter 1 is carried out digitlization to the analog video signal of importing in the wireless transmission of video/sound, coding sends the video/voice data after encoding, and receives various control informations by receiver side, specifies bit rate to reach and send number of times again.

Above-mentioned video/sound receivers 2 is in the wireless transmission of video/sound, receive encoded video/voice data, decision errors, error rate, electric field strength are distributed to the level of video/sound from these data, result of determination is sent to sender side, and encoded video/voice data decoded, output to outside display monitor central monitoring system.

Fig. 2 illustrates the schematic block diagram that this radio communication device constitutes.

Among Fig. 2, video/acoustic transmitter 1 is made of following: from the input part 5 of the video/sound of video source 3 input, video/voice data utilization behind the coding is wirelessly transmitted to the sending part 6 (transmitting elements of receiver side, the 2nd transmitting element), the encoding section 7 that the signal that is input to input part 5 is encoded, the control information of sending here according to video/sound receivers 2 sides is set bit rate and the maximum bit rate that send number of times again/send again number of times configuration part 8 (set point memory cell, the transfer rate setup unit), send number of times count section 9 again according to what the control information counting of sending here from video/sound receivers 2 sides sent same data several times again when sending data, and the acceptance division 10 (receiving element, the 2nd receiving element) that receives the control information of sending here from video/sound receivers 2 sides.

Above-mentioned bit rate/send again number of times configuration part 8, store the set point that makes up a plurality of transfer rates and send number of times again with form in advance, the set point of being stored according to the control information selection that sends from video/sound receivers 2 is set transfer rate and is sent number of times again according to the set point of this selection simultaneously.

Above-mentioned encoding section 7, bit rate/send again number of times configuration part 8, and send number of times count section 9 for example to constitute again, utilize software to realize data transport functions by microcomputer.Encoding section 7 for example also can constitute as other electronic unit as mpeg decoder.

On the other hand, video/sound receivers 2 is made of following: the acceptance division 11 (receiving elements that receive encoded video/voice data of sending here from video/acoustic transmitter 1 side, the 1st receiving element), video/voice signal that video/acoustic transmitter 1 side is sent here outputs to outside efferent 12, the lsb decoder 13 of the encoded video that video/acoustic transmitter 1 side is sent here/voice signal decoding, whether video/voice data that judgement video/acoustic transmitter 1 side is sent here has error detection unit 14 (the communications status detecting unit of error, the error identifying unit), judgement sends error rate detection unit 15 (the communications status detecting unit of the error rate of video/voice data that 1 side sends here from video/sound, the error identifying unit), electric field strength detection unit 16 (the communications status detecting unit of the electric field strength of video/voice data that judgement is sent here from video/acoustic transmitter 1 side, the electric field strength identifying unit), and video/voice data to sending here from video/acoustic transmitter 1 side, error detection unit 14, error rate detection unit 15, or sending necessity again and increasing maximum when sending the necessity of number of times again of video/voice data arranged in the electric field strength detection unit 16, these control informations are sent to the sending part 17 (transmitting element, the 12nd transmitting element) of video/acoustic transmitter 1 side.

Above-mentioned lsb decoder 13, error detection unit 14, error rate detection unit 15 and electric field strength detection unit 16 for example are made of microcomputer, realize data transport functions by software.In addition, lsb decoder 13 also can constitute as other electronic unit as mpeg encoder equally with the encoding section 7 of video/acoustic transmitter 1.

The below action of the above-mentioned such radio communication device that constitutes of explanation.

Total body action of this radio communication device at first, is described.

As shown in Figure 1, video/voice signal is input to video/acoustic transmitter 1 from video source 3, utilizes wireless transmission, is sent to video/sound receivers 2, outputs to display monitor central monitoring system 4.

In the transmission of video/sound receivers 2 between video/acoustic transmitter 1 and video/sound receivers 2, in the obstruction that is subjected to from frequency band corresponding on every side, during data generation error, and/or error rate is when giving video/sound influence degree low etc., judge that received electric field strength is low to video/sound influence degree, carry out in this judgement this error being sent to video/sound receivers 2.In video/acoustic transmitter 1,, reduce bit rate, increase and send number of times again, to strengthen the error tolerance by receiving control information from video/sound receivers 2 sides.

Next illustrates the concrete action of this radio communication device.

Be input to the video/voice signal of video/acoustic transmitter 1 from video source 3, as shown in Figure 2, be input to the input part 5 of video/acoustic transmitter 1, be encoded into the compressed digit signals that is suitable for wireless transmission by encoding section 7, be sent to sending part 6, send to video/sound receivers 2 by wireless transmission.Video/the voice signal that is transmitted is received by the acceptance division 11 of receiver 2, after lsb decoder 13 decodings, outputs to display monitor central monitoring system 4 by efferent 12.Here, be input to the encoded video/voice signal of the acceptance division 11 of receiver 2 sides, judge Shan 14, error rate detection unit 15, reach electric field strength detection unit 16 through delivering to error with the different paths of signal of decoding.

In the error detection unit 14, judge the error of the data that receive, when error is judged because of the data of the error that is necessary to send again, so the sending part 17 by video/sound receivers 2 send requirement again to the transmission of video/acoustic transmitter 1 side, video/sound sends 9 pairs of the number of times count section of sending again of 1 side and send number of times to count again, is sent the data of error simultaneously once more again to video/sound receivers 2 sides by sending part 6.When also producing error, repeat this stream with stipulated number by sending again.Send number of times count section 9 to count this again and send number of times again.Even send number of times to send again again with the maximum of setting, in the time of can not round-off error,, increase maximum and send number of times again by bit rate/send the number of times configuration part 8 change bit rates again, make not produce error.

In addition, when 15 pairs of videos of error rate detection unit and sound are judged to be the error of the level that can't bear to watch or can't bear to hear, sending part 17 by video/sound receivers 2 sends to video/acoustic transmitter 1 side with this information, the bit rate of video/acoustic transmitter 1/send number of times configuration part 8 again by the change bit rate, increase maximum and send number of times again, thereby make the raising error rate, error does not take place.The error of the level of watching or can't bear hearing as such can't bear, by with relatively the judging of the error rate level of calculating by experiment in advance.A plurality of this error rate level also can be arranged.Also can indicate the formation of selecting boundary levels according to the user.

In addition, when electric field strength detection unit 16 is judged to be when giving electric field strength level with the error that can't bear to watch or hear level to video and sound, just the sending part 17 by video/sound receivers 2 sends to video/acoustic transmitter 1 side with this information, bit rate/send number of times configuration part 8 again by the change bit rate, increase maximum and send number of times again, make the low state of electric field strength also not produce error.Identical with the situation of error rate, as to can't bear to watch or can't bear to hear as received signal electric field strength, by with relatively the judging of the received electric field strength that obtains by experiment in advance.

Constitute the control information generating unit 18 of generated error information with above-mentioned error detection unit 14, error rate detection unit 15, electric field strength detection unit 16.At least one preferably uses the mode of the full detail generated error information of 2 portions or 3 portions as control information in these 3 portions though can use, and obtains suitable control information.

In addition, sending number of times again by reducing bit rate, increasing, when error not taking place, for whether the generation of confirming to hinder is also continuing, by improving bit rate at regular intervals, increase maximum and send number of times again, confirm respectively to send number of times no longer to cause error again with the maximum of new settings, or error rate is not low, or electric field strength is not low, as no problem, returns original bit rate and the maximum set point of sending number of times again.

By repeating this action, even on every side this radio communication device is existed when hindering, also video/sound generating is not disturbed, by reducing bit rate smoothly, increase and send number of times again, guarantee that it is possible that picture element/sound that ability is seen transmits.

That is to say, as the characteristic of the present application, as when hindering generation, carry out the temporary transient bit rate that reduces, the processing that improves bit rate when not hindering once more then can realize necessary MIN image deterioration, as a result of, it is possible receiving high-quality video and voice data.

Fig. 3～Fig. 5 illustrates the flow chart of the action of this above-mentioned radio communication device.Fig. 3 and Fig. 4 illustrate the wireless transfer rate change action of video/sound receivers 2 sides, and Fig. 5 illustrates the wireless transfer rate change action of video/acoustic transmitter 1 side.S represents each step of flow process among the figure.

In the flow process of video/sound receivers 2 sides of Fig. 3, at first from receive data, detect the communications status (step S1) of 2 of video/acoustic transmitter 1 and video/sound receiverses.

Secondly, according to the communications status generated error information (step S2) that detects

Once more, sending part 17 sends to video/acoustic transmitter 1 with the control information that generates, and process ends (step S3).

Fig. 4 is the subprogram that communications status detects, the processing of the step S1 corresponding to 3.

At first, the error rate (step S11) of error rate detection unit 15 determinating receiving datas.

Secondly, error detection unit 14 is according to the error (step S12) of the data of sending the number of times data judging to receive again.

Once more, electric field strength detection unit 16 is judged the electric field strength (step S13) of received signal, returns the step S1 of Fig. 3.

Above-mentioned 3 step S11～S13 are as carrying out a step at least, so in step S2 shown in Figure 3, by control information generating unit (control information generation unit))) 18 generated error information are possible.

For example, though the error rate of judging just, also can generated error information, even or the error of just judging, also can generated error information, even or the electric field strength of the received signal of just judging, also can generated error information.In addition, as the combination of error rate and error, the combination of the electric field strength of error rate and received signal, the combination of the electric field strength of error and received signal, the combination of the electric field strength of error rate, error and received signal can generated error information.

In addition, the judgement among above-mentioned steps S11～S13 when receiver 2 sides regeneration video and voice data, is judged the error that can't bear to watch or can't bear the level of hearsay.This judgement also can have a plurality of decision levels (for example the 1st decision level, the 2nd decision level) according to error degree.In addition, also can be set as difference respectively, also can set priority judging to each error determinating reference.At this moment, preferably generate control information, send to video/acoustic transmitter 1 side according to decision level.

Fig. 5 illustrates the flow chart of the action of video/acoustic transmitter 1 side.

At first, receive the control information (step S21) that video/sound receivers 2 sides send.

Then, according to the control information that receives, even judgement send number of times to send with maximum more again, also whether error correction impossible (step S22).Here, when be judged to be error correction be possible the time, judge that at step S23 video/sound receivers 2 side joints receive whether low level of electric field strength.

As be judged to be electric field strength at step S23 is not low level, then judges that at step S24 receiver 2 side joints receive whether high level of error rate.

On the other hand, send number of times to send again more also to be to revise the time even be judged to be among the above-mentioned steps S22 with maximum, when being judged to be the received electric field strength low level among the above-mentioned steps S23, perhaps, be judged to be among the above-mentioned steps S24 when receiving the error rate high level, in step S25,, set bit rate and send number of times again according to the control information that receives.

Here, in hindering many environment, error takes place in the transmission by the video of wireless generation and sound etc., even send number of times to send data more again with the maximum of setting, the situation that normal data can not send is in this situation, by by bit rate/send number of times configuration part 8 to reduce bit rates (transfer rate) again, increase and send number of times again, to strengthen the error tolerance.

Therefore, the bit rate among the above-mentioned steps S25 with send number of times again be set at the reduction bit rate, increase the setting of sending number of times again.About according to the bit rate of this control information and the object lesson that send the setting of number of times again, illustrate in the back by the 2nd and the 3rd example.

Be judged to be among the step S24 when receiving error rate and being not high level, return original bit rate and the maximum set point of sending number of times again, transfer to step S27 at step S26.

Utilize the bit rate of setting among the step S27 and send number of times again, data are sent to video/sound receivers 2, process ends.

Like this, in the real-time transmission of video/sound etc., preestablish several modes, at first, under no obstruction state, the bit rate that beautiful image and video can be decoded and send number of times again, and low the bit rate image seen of ability and the level of sound simultaneously, i.e. bit rate and the combinations of sending number of times again etc. are carried out constant bitrate with the highest order rate in the time of usually to transmit, just when hindering generation, temporarily reduce bit rate and increase the control of sending number of times again.

As mentioned above, the radio communication device of this example, video/sound receivers 2 is made of following: the acceptance division 11 that receives video/voice data, judge the error detection unit 14 of the error of video/voice data, judge the error rate detection unit 15 of the error rate of video/voice data, judge the electric field strength detection unit 16 of the electric field strength of video/voice data, and the sending part 17 that sends control information, video/acoustic transmitter 1 is made of following: the sending part 6 that sends video/voice data, set bit rate and the maximum bit rate that send number of times again/send again number of times configuration part 8 according to control information, what counting sent same data several times again send number of times count section 9 again, and the acceptance division 10 that receives control information, therefore be subjected to from around obstruction the time, by predefined several bit rates with send in the combination range of set value of number of times again, automatically reduce bit rate, increase and to send number of times again, thereby can realize that raising is to the tolerance of obstruction, bit rate with send number of times to change function automatically again.

That is to say that in the transmission of video/sound etc., service band is hindered in many environment, owing to hinder, video/sound stops, and becomes problem.In the Patent Document 1, even disclosed the device of the discarded probability of reception data that noise increase in the reception environment also can reduction factor causes according to error.

Therefore, Patent Document 1 described device utilizes error rate change compression ratio and send number of times again each packet transmission, in addition, the error rate of the data of reception is big more, requires compression ratio and send number of times big more again, though error has reduced, video etc. might become and can't bear to watch.Relative therewith, in this example, video/sound transmitted realize that the constant bitrate of always guaranteeing necessary bit rate transmits, and only when hindering, instantaneous judgement hinders the error that causes, eyes can find out bring obstruction to video/sound before, send number of times again by temporary transient reduction bit rate and increase, do not having when obstruction, always reproduce beautiful image/sound, and when hindering generation, also only reduce picture element/tonequality slightly, can be suppressed to Min. with significantly hindering.

[example 2]

Illustrate that another example of the present invention is as follows.In this example, the bit rate of this radio communication device is described and send the number of times variation again.The formation of relevant hardware, because of identical with Fig. 1 and Fig. 2 of illustrating in the example 1, its detailed description of Therefore, omited.

Fig. 6 illustrates the flow chart of wireless transfer rate change action of video/acoustic transmitter 1 side of the radio communication device of this example.Utilize the bit rate of pie graph 2/send number of times configuration part 8 again and send the microcomputer of number of times count section 9 to carry out again.To carrying out the identical number of steps of step mark of same treatment and the explanation of omitting its repeating part with Fig. 5.

Bit rate/maximum of reference sent the configuration example of number of times again when Fig. 7 illustrated video/voice data and sends, and was the example that the MPEG of transmission mpeg stream leads.

Among Fig. 7, MPEG leads and sets MPEG respectively with respect to set point and lead (Mbps) and maximum and send number of times again.Each set point has maximum/minimum transfer rate and MPEG leads (Mbps).The number of times that video/acoustic transmitter 1 was sent again when maximum sent number of times to be the communications status deterioration again.

For example among Fig. 7 shown in a, communications status is preferably the time, and set point is used " 0x21 ", and it is 7.86 (Mbps) that MPEG leads, it is " 1 " that maximum is sent number of times again, when communications status worsened, shown in b among Fig. 7, the MPEG that sets set point " 0x16 " led 7.18 (Mbps) according to its degree, maximum is sent number of times " 2 " again, and for example among Fig. 7 shown in the c, the MPEG that sets set point " 0xOC " leads 5.85 (Mbps), and maximum is sent number of times " 4 " again.Set point and MPEG lead as an example and are not limited to this.Like this, make bit rate variable according to communications status.

Motion flow with reference to the sender side in the radio communication device of this example of flowchart text of Fig. 6.

At first, when the control information that receives according to step S25 is set bit rate and sent number of times again, or step S26 returns original bit rate with maximum when sending the set point of number of times again, judges among the step S31 that video/sound receivers 2 side joints receive error rate and sharply whether increase.

Here, the judgement whether error rate sharply increases, when the difference absolute value of detected value and previous value (past value before comprising certain hour) surpassed prescribed limit, being judged to be error rate sharply increased.As decision method one example, by changing threshold value etc. according to the error level, simulation in advance waits sets suitable value.

Sharply do not increase as error rate among the step S31, judge in step S32 that then whether video/sound receivers 2 side electric field strength sharply reduce.The judgement whether electric field strength sharply reduces, method judgement that can be same with the determination processing of step S31.

When receiving error rate among the above-mentioned steps S31 and sharply increasing, or when video/sound receivers 2 side electric field strength sharply reduce among the step S32, judge why communications status plants the reason rapid deterioration, and S33 is set at lowermost level with bit rate in step, enters step S27.

For example among Fig. 7 shown in the b, set set point " 0x16 " and MPEG lead in the situation of 7.18 (Mbps), when receiving error rate or electric field strength and sharply reducing, shown in d among Fig. 7, bit rate is not step by step but drops into lowermost level once.So, when waiting the communications status rapid deterioration because of the communication obstruction, before the obstruction of watching video/sound significantly, send number of times again by falling bit rate once and increasing, that can seek to communicate by letter guarantees.

Return the flow chart of Fig. 6, do not have rapid reduction as video/sound receivers 2 side electric field strength among the above-mentioned steps S32, judge in step S34 that then whether video/sound receivers 2 side joints receipts error rate slowly increases,

Here, the judgement whether error rate slowly increases, relatively the judging of difference that for example can be by detected value and previous value (comprising the preceding past value of certain hour).Error rate judges that as there not being slow increase whether video/sound receivers 2 side electric field strength slowly reduce in step S35.The judgement whether electric field strength slowly reduces is judged by the method identical with the determination processing of above-mentioned steps S34.

When receiving error rate among the above-mentioned steps S34 and slowly increasing, or when video/sound receivers 2 side electric field strength slowly reduce among the step S35, among the step S36 step by step (for example each level) reduce bit rate, set, enter step S27 then.

For example, the MPEG of the set point shown in a among Fig. 7 is led 7.86 (Mbps) reduce one-level, be set at that the MPEG shown in the e leads 7.81 (Mbps) among Fig. 7.Set point and MPEG lead as an example, are not limited thereto.For example, above-mentioned situation also can be from Fig. 7 the MPEG of the set point shown in a lead MPEG that 7.86 (Mbps) drop into the set point shown in the b among Fig. 7 and lead 7.18 (Mbps) and set.

Video/sound is counted receiver 2 side electric field strength as there not being slow reduction among the above-mentioned steps S35, then enters to former state step S27.Like this, when communications status slowly worsens,, communication is guaranteed and do not reduced picture element/tonequality as far as possible by a level decline bit rate.

[example 3]

The wireless transfer rate that Fig. 8 illustrates video/acoustic transmitter 1 side of this radio communication device changes the flow chart of action.To carrying out identical number of steps of the step mark of same treatment and the explanation of omitting its repeating part with Fig. 5.

In the flow chart shown in Figure 8, when setting bit rate and sending number of times again according to the control information that receives in the step 25, perhaps, when step S26 returns original bit rate and send number of times again, differentiate video/sound receivers 2 side joints at step S41 and suitably whether to receive the error rate level.

Here, error rate is suitable level, is whether to be positioned at the level range that does not have to hinder with detected value to judge.As decision method one example, utilize according to the error rate level to change threshold value etc., simulation in advance waits and sets suitable value.

When error rate was not suitable level among the above-mentioned steps S41, step S42 differentiated video/sound receivers 2 side electric field strength and whether is positioned at suitable level.Expression error rate or electric field strength are positioned at the threshold value of suitable level, wait by simulation in advance and set suitable value.

When receiving error rate among the above-mentioned steps S41 and being positioned at suitable level, perhaps, when video/sound receivers 2 side electric field strength are positioned at suitable level among the step S42, be judged as the level that error rate and/or electric field strength are returned to does not have obstruction, S43 is set at the superlative degree with error rate in step, enters step S27.

For example among Fig. 7 shown in the b, set set point " 0x16 " and MPEG lead under the situation of 7.18 (Mbps), be not step by step but bring up to the superlative degree shown in a among Fig. 7 once.Can improve picture element/tonequality rapidly when like this, communications status recovers.Here among step S41 and the step S42, the judgement that also error rate or electric field strength can be positioned at suitable level is made as multistage.Such control be possible, for example, set the 1st suitable level and 2 grades of the 2nd suitable level that are lower than the 1st suitable level, bring up to the superlative degree once when reaching the 1st suitable level, be decided to be five-star intermediate level when reaching the 2nd suitable level.

Return the flow chart of Fig. 8, video/sound receivers 2 side electric field strength among step S44s judge then that as not being suitable level whether video/sound receivers 2 side joints receipts error rate slowly descends among the step S42.The judgement whether error rate slowly descends, relatively the judging of difference that for example can be by detected value and previous value (comprising the preceding past value of certain hour).Error rate then judges that at step S45 whether video/sound receivers 2 side electric field strength slowly increase as slowly not descending.The judgement whether electric field strength slowly increases, the available and same method of determination processing above-mentioned steps S44.

When the reception error rate slowly descended among the step S44, perhaps, when video/sound receivers 2 side electric field strength slowly increased among the step S45, (for example each level) reduced bit rate step by step in step S46, sets, and enters step S27.

For example, the MPEG of the set point shown in the b among Fig. 7 is led 7.18 (Mbps) improve one-level, the MPEG that is set at the set point shown in the f among Fig. 7 leads 7.26 (Mbps).Set point and MPEG lead as an example, are not limited to this.Slowly do not descend as video/sound receivers 2 side electric field strength among the above-mentioned steps S45, then enter to former state step S27.

So, if turn back to the state that communications status does not have obstruction, then bit rate is brought up to the superlative degree once, reproduce high picture element/high tone quality, when communications status slowly recovered, classification improved bit rate, can guarantee communication, and slowly improve picture element/tonequality.

Here, when taking place to hinder for the moment, owing to be difficult to instantaneous returning, also can not each but every confirming for several times error rate, electric field strength.At this moment, as long as just can every repeatedly carrying out above-mentioned steps S41～step S46.

[example 4]

Illustrate that other example of the present invention is as follows.

Fig. 9 illustrates the formation block diagram of the radio communication device of this example.As the radio communication device of this example, as shown in figure 13, be the example that is applied to the wireless TV receiver of displays separated type.

That is to say that above-mentioned Wireless TV system 101 is made of TV body unit 103 and wireless center 102 as shown in figure 13.

Above-mentioned TV body unit 103 comprises the wireless TV receiver of internal battery, comprises remote controller 130 in addition, can realize being connected in the operation of the video deck group etc. of wireless center unit 102 by this TV body 103.

Among Fig. 9, Wireless AV system 101, by constituting as the wireless center unit (calling wireless center in the following text) 102 of infrastructure device and TV (TV) body 103 as movable termination, wireless center 102 (radio communication devices, transmitter, display unit) and TV body 103 (radio communication device, receiver, display unit) pairing constitutes wireless transmission network.

Wireless center 102 comprises: each antenna end of BS end 111, U/VHF antenna end 112, diversity type end 113, band connects video 1 input 114 of the S end of equipment such as digital VTR, DVD player, decoder input/video 2 inputs 115, display monitor central monitoring system/BS output/video 3 inputs 116, AC power supplies portion 117, and automobile-used DC power supply unit 118.

Above-mentioned TV body 103 comprises TV output/video 4 inputs 121 of equipment such as connecting digital VTR, DVD player, AC power supplies portion 122 and automobile-used DC power supply unit 123.

In addition, TV body 103 be 102 separable with wireless center, utilize internal battery portability or thin-type display device movably, be for example to comprise LCD TV, inorganic EL/ OLED display, the broad concept of various display unit such as plasma scope is not limited by indication mechanism.In addition, in this specification, TV body 103 mainly has Presentation Function and acoustic function etc., and on the other hand, wireless center 102 is mainly accommodated the controlled function of control tuning and TV body 103.As thin-type display device, is that example describe with the LCD TV according to the TV body 103 of this example.

103 SS (SpreadSpectrum: wireless mode transmitting and receiving data spread spectrum) that pass through according to the IEEE802.11b specification of wireless center 102 and TV body.As frequency band, open recently 5GHz band, the pattern of also available 5GHz band replaces 2.4GHz.Transmit from the data of wireless center 102,, transmit DVD video, digital broadcasting with the communication line translatory movement image that surpasses 10Mbps with the video compression format of MPEG (Motion Picture Experts Group) 2 to TV body 103.In addition, the instruction that wireless center 102 and TV body are 103 transmits, and carries out with the SS wireless mode.

Stream behind the coding of MPEG video and mpeg audio (ranking), the stream that also comprises other codings, when being used for practical application, be necessary to comprise synchronously, the stream of multiplexed coding, make to be unified into single line, have the medium and the network of this stream of storage simultaneously, make the data mode that becomes to be suitable for intrinsic physical format and communication procedure.

The same in the MPEG2 system with MPEG1, the program/stream (MPEG2-PS, the PS: program flow) with transmission/stream (MPEG-TS, the TS: transport stream) that can constitute a plurality of programs that constitute a program are arranged.

Mpeg stream, most signs that also have, but be the byte/stream of byte align to the constituent parts of each title etc.As to all common structures of mpeg system, not in the data division of fixed length, the information of expression length places the front, not the time or skip this part, or confirms the title of next data set, becomes the data configuration of the separating treatment that realizes that reliability is high.

Reception is according to the video of MPEG2 coded system compression, the device of voice signal, in the decoding side is to prevent the overflowing of video, voice data, underflow, is necessary to make video, sampled voice frequency or the STC (system clock) of decoding side consistent with video, the sampled voice frequency of the side of encoding.

Therefore, by adopting the PCR (program clock benchmark reference point) or the SCR (system clock reference reference point) of the MPEG2 system specification (ISO/IEC specification 13818-1) regulation, make video, the sampled voice frequency of video, the sampled voice frequency of decoding side and the side of encoding consistent in the decoding device.

Figure 10 illustrates the formation block diagram of the wireless center 102 of above-mentioned Wireless AV system.

Among Figure 10, wireless center 102 is made of following part: be connected BS end 111, utilize the BS tuner 131 of channel selecting signal reception/channel selection BS broadcasting, be connected U/VHF antenna end 112, utilize the U/VHF tuner 132 of channel selecting signal reception/channel selection U/VHF broadcasting, demodulation is by the video/sound demodulation section 133 of video/sound (AV) signal of BS tuner 131 or the 132 reception/channel selections of U/VHF tuner, utilize the sound converter section 134 of the program-associated information of sound that sound switching signal conversion receives and EPG (EPG) etc., to the video/acoustic information that utilizes the source to select signal to receive, program for information about, from video 1 input 114, decoder input/video 2 inputs 115, the 1st selector 135 that the outside input information of display monitor central monitoring system/BS output/video 3 inputs 116 is selected, send and receive the TV instruction, the data conversion that the 1st selector 135 is selected is the video compression format of MPEG2, utilize the SS wireless mode to send to the SS transmitting element 136 (transmitting elements of TV body 103, receiving element, the 2nd transmitting element, the 2nd receiving element), send channel selecting signal 141, sound switching signal 142, when signal 143 grades are selected in the source, send and receive TV instruction 144, carry out the wireless center microcomputer 137 (transfer rate setup unit) of all control of device, the control program of storage wireless center microcomputer 137, communication control data, and then the nonvolatile memory of can electricity rewriting of the various data that lead of the MPEG that each instruction is set be EEPROM (the erasable programming ROM that removes) 138 (set point memory cell).

Wireless center 102 also can comprise a plurality of broadcast receptions with tuner (being 2) here, and at least one is the tuner that can receive received terrestrial digital broadcasting in a plurality of BS tuners 131, the U/VHF tuner.

SS transmitting element 136 comprises: the A/D converter 151 that is become digital signal by the data conversion that the 1st selector 135 is selected, data conversion is become the mpeg 2 encoder 152 of the video compression format of MPEG2, send the SS wireless device of data and the SS wireless transmission engine 153 that radio control section is formed with the SS wireless mode, reach the 1SS-CPU154 (communications status detecting unit) that controls SS each one of transmitting element and detect the electric wave state.

EEPROM138 as shown in Figure 7, the MPEG to each content setting leads with form storage.Write the variable wireless center 102 of program of EEPROM138 and all size in the TV body 103 by change.That is, recently, for avoiding the loss of time to the debugging change mask ROM of each system development, program ROM is made nonvolatile memory, as EPROM, EEPROM seeks the shortening significantly of program development/correction time.As downloading, rewrite the contents of program of EEPROM in addition, can easily carry out the upgrading of function or the change of function so.

SS wireless transmission engine 153 comprises, the SS receiving element 161 (illustrating in Figure 11) of TV body 103 is sent the sending function of MPEG2 stream and instruction etc., and receives the receiving function of instruction etc. from SS receiving element 161.

Particularly 1SS-CPU154 comprises the function as the electric wave state detection unit of the communications status (power of electric wave, the obstruction of communicating route) that requires 103 of detection wireless center 102 and TV bodies according to sending again of the electric field strength that receives electric wave, error rate.The information of representing detected electric wave state is delivered to wireless center microcomputer 137 as TV instruction 144.In this example, the 1SS-CPU154 that shows wireless center microcomputer 137 possesses the formation of above-mentioned electric wave status detection function, but also can be, the 2SS-CPU184 of TV body 103 possesses same function, the information of representing the electric wave state of detection is sent to the pattern of wireless center 102 from TV body 103.Perhaps also can be, 1SS-CPU154 and 2SS-CPU184 both sides possess the formation of electric wave status detection function.In addition, also can be the pattern that TV microcomputer 164 or wireless center microcomputer 137 are carried out above-mentioned electric wave status detection function.

Wireless center microcomputer 137, carry out all control of device, simultaneously as shown in Figure 7 in advance with a plurality of transfer rates of form storage combination and the set point of sending number of times again, and, set based on the transfer rate of selected set point and the control of sending number of times again according to the set point that the control information selection that TV body 103 sends is stored.

Here, the technology as realizing that Wireless AV system is used for example has the standard specification of finishing the standardized HAVi of being called (home audio/video interoperability) structure in January, 2000.This specification connects home-use electrochemical goods or computer as described in the summary of the HAVi V1.0 technical conditions version part (1.1 scopes of 1 summary), realizes that the user uses a certain equipment and providing of interface that another equipment uses is provided.In the HAVi specifications, construct by the network of the home-use electrochemical goods generation of IEEE1394 and TEC (International Electrotechnical Commissio) 61883 standards as an example setting.In addition, as this summary part of these specifications, all the user can freely use the equipment of the network connection that realizes by HAVi.Like this, be positioned at the AV equipment of family, construct the AV network,, also can freely be used in combination even be positioned at the equipment in the room that the user leaves by connection.

In addition, in such family the AV network, also can be the wireless communication terminal that for example carries out the mobile phone/PHS (personal handy phone system) (registered trade mark) of radio communication or carry information terminal (to call PDA (personal digital assistant) in the following text) etc. as the wireless center 102 of transmitter, as the TV body 103 of receiver.

Figure 11 illustrates the formation block diagram of the TV body 103 of above-mentioned Wireless AV system.

Among Figure 11, TV body 103 is made of following: send and receive the TV instruction, receive the MPEG2 stream or the instruction transmission data of SS transmitting element 136 transmissions of wireless center 102, simultaneously the MPEG2 stream that receives being waited decoding (recovery) is the SS receiving element 161 (transmitting element of former data, receiving element, the 1st transmitting element, the 1st receiving element), selection is by 2nd selector 162 of SS receiving element 161 data recovered with the AV signal of importing from the outside through TV output/video 4 inputs 121, the TV display part 163 that the LCD of display video signal and output sound signal etc. constitute, send and receive TV instruction 171 transmission source selection simultaneously signal 172, OSD (showing) 173 etc. at screen, the luggage of going forward side by side is put the TV microcomputer 164 of all control, the control program of storage TV microcomputer 164, communication control data, and the nonvolatile memory of can electricity rewriting of various data such as communication channel change be EEPROM165, reception is from the remote controller light accepting part 166 of the control command of not shown remote control, battery 167, and the battery charge microcomputer 168 that discharges and recharges of control battery 167.

SS receiving element 161 is made of following: by utilizing wireless mode to receive the SS wireless device of the data that send and the wireless receiving engine 181 that radio control section constitutes, the MPEG2 decoder 182 that the MPEG2 stream that receives is decoded, decoded data conversion is become the D/A transformation component 183 of analog signal, and control SS each one of receiving element and detect 2SS-CPU184 (the communications status detecting unit of electric wave state, the error identifying unit, the electric field strength identifying unit).

SS wireless receiving engine 181 possesses, and receives from the receiving function of the MPEG2 stream of the SS transmitting element 136 of wireless center 102 and instruction etc. and sends the sending function of instruction from SS receiving element 161.

TV microcomputer 164 inside have OSD function take place, and the information of channel, time, volume etc. are shown on the picture of TV etc.In the electronic equipment of the video-unit of TV etc., video conference etc., generally be that the information with channel, time, volume etc. is shown on the television image.The data of OSD are not images, keep with the form that is called bitmap, are transformed to the pixel value of the YUV form of representing with Y, Cb, Cr from this bitmap, the pixel after this conversion are overlapped on the original image of television broadcasting etc.In addition as image-reproducing apparatus that will not shown DVD etc. be connected on TV output/video 4 inputs 121, then overlapping onto in the display frame on the reproduced picture, it is possible carrying out the OSD demonstration.

In addition, though omit among the figure, also can be, TV body 103 possesses loud speaker, keyboard input part, inserts and takes off notch that the outside extension record medium of card type use etc., with the outside extension record medium of the card type directly formation of reading of data of packing in this groove.The outside extension record medium of card type for example are, utilize the power supply support to keep SRAM (static RAM (SRAM)) card of writing information, or the compact flash device (CF) (registered trade mark) that constitutes such as the flash memory supported of power supply not, smart media, memory set is with microminiature hard disk drive (HDD) of the onesize PC card type II that maybe can pack into of compact flash etc.

Remote controller light accepting part 166 is to use the optical communications port portion of IR (infrared ray), receives the light signal from the remote control that TV body 103 or wireless center 102 are operated.Specifically, be according to the specification of utilizing infrared ray transmission data to use, IrDA (Infrared Data Association), ASK etc. carry out the I/O mouth that optical communication is used, or utilize the wireless communication port of electric wave.

167 pairs of TV bodies of battery, 103 each one supply with the power supply of regulation.Battery charge microcomputer 168 when having arrived battery 167 chargeable states, when for example TV body 103 detects the signal that is installed on wireless center 102 or other adopted springs, the control that the charging medium of battery 167 is discharged and recharged through electric power supply side (all not shown).Battery charger microcomputer 168, the discharging current of accumulative total battery pack that concrete is is when the residual capacity of judging battery pack reaches setting when following, just begin charging, simultaneously, accumulative total is to the charging current of battery pack in the charging, when judging that battery pack reaches fully charged state, make to stop charging.Battery 167 after the charging becomes the main power source that carries TV, to each supply capability of body when TV body 103 disconnects source power supply.

As mentioned above, the Wireless AV system 101 of this example, leading the wireless center 102 and the TV body 103 that send reception video and voice data by the MPEG with regulation constitutes, wireless center 102 comprises, carry out the wireless center microcomputer 137 of the whole control of device, the EEPROM138 that the MPEG that storage is set leads, and utilize according to the received-signal strength that receives electric wave, the sending again of error rate require to be detected the 1SS-CPU154 of the communications status of 103 of wireless center 102 and TV bodies, wireless center microcomputer 137 is according to the communications status that detects, set the control of the video and the voice data transfer rate of transmission, so when communications status changes (when particularly worsening), the user is with manually reducing bit rate or reducing bit rate regularly unlike in the example always, but pass through the automatic setting bit rate according to the AV data, even communications status also can suppress video when worsening and voice data corrupts to Min., can keep data as far as possible to the data of information such as the news program property passed on requirement and transmit.

In addition, radio communication device of the present invention, transmitter, receiver, wireless communication system, and Wireless AV system are not limited to above-mentioned example, can add various changes certainly in not breaking away from main spiritual scope of the present invention.For example, be pocket TV as wireless AV equipment, but be not limited to the TV receiver, also applicable to have a radio communication function or its Fused device.For example, as AV equipment, except that VTR (video tape recorder), also can be the record regenerator that is recorded in HDD or DVD.In addition, sending the device that receives as implementation data, also can be the device that merges the information equipment function of personal computer representative, applicable to whole systems.In addition, the content of transmitting and receiving data is any all can.

In addition, the TV receiver has been described in this example, but has been not limited thereto, as previously mentioned, also can be applicable to other AV equipment of tuner and personal computer, use tuner.

In addition, constitute above-mentioned radio communication device, transmitter, receiver, and the kind of the various handling parts of Wireless AV system etc., the kind/form of set information etc., be not limited to above-mentioned example.Particularly, be suitable for equipment according to HAVi.

In addition, the AV data utilize the mpeg stream according to the MPEG2 coded system to transmit, and transmit but data transmit the mpeg stream or the data beyond the mpeg stream that also can be equally applicable to be produced by other MPEG modes.It is an example that described content type of Fig. 6 and MPEG lead, but is not limited thereto.

In addition, used the title of so-called radio communication device, wireless communication system, Wireless AV system and wireless transmission method in this example, this is for the convenience that illustrates, also can be wireless transfer equipment, AV data communication equipment, information communicating method etc.

The radio communication device of above-mentioned explanation, transmitter, receiver and Wireless AV system also availablely make this radio communication device, transmitter, receiver and Wireless AV system have the program that function uses to realize.This procedure stores is in the recording medium that available computers reads.Among the present invention, as this recording medium, main storage itself also can be a program medium, also can be that the setting program reading device is as external memory, by inserting the program medium that recording medium can read therein.No matter be which kind of situation, program stored can be the formation that CPU visit is carried out, or read routine and will be stated from not shown program storage area under the program of reading in any situation, and carries out the mode of this program.The program of this download usefulness is stored in the body apparatus in advance.

Here, the said procedure medium are the recording medium that can constitute discretely with body, it also can be the data system of tape or tape, the disc system of the CD of disk such as floppy disk or hard disk, CD-ROM/MO/MD/DVD etc., card system such as IC-card/light-card perhaps is loaded with the medium that comprise by the fixed routine of the semiconductor memory of main ROM, EPROM, EEPROM, flash rom etc.

In addition, though not shown, possess can with cell cases that external communication network is connected in, can be movably program-carried medium also, make by it and communicate to connect the unit from the downloaded program.From this downloaded program the time, its download is stored in the body apparatus in advance with program, perhaps also can be the program that other recording medium is loaded.In addition, the content as being stored in recording medium is not limited to program, also can be data.

As above-mentioned detailed description, according to the present invention, in the transmission of video that the wireless transmission by constant bitrate produces and sound, because obstruction on every side etc., error takes place, and when interference video and the sound, transmits bit rate by temporary transient the reduction automatically, the maximum that increases error information is sent number of times again, can strengthen the tolerance to error.

The present invention is not limited to above-mentioned each example, can do various changes in the scope shown in the claim item, and the example that obtains about the technical unit that discloses respectively in the different examples of appropriate combination is also contained in the technical scope of the present invention.

Each one or the various processes of the radio communication device of above-mentioned example, program stored in the record cell of the calculation unit implementation ROM of CPU etc. or RAM etc., the communication unit of the output unit by input units such as supervisory keyboard, display etc. or interface circuit etc. can be realized.Therefore, have the computer of these unit,, just can realize the various functions and the various processing of the radio communication device of this example as long as the recording medium of reading and recording said procedure is carried out this program.And, can realize above-mentioned various functions and various processing on the computer arbitrarily by said procedure being recorded in movably recording medium.

As recording medium,, also can be for example such memory program medium of ROM of not shown memory for handling with microcomputer, in addition, also can be, as not shown external memory, the setting program reading device is by being inserted in recording medium wherein the program medium that can read.

In addition, which kind of situation no matter, institute's program stored is preferably by constituting that microprocessor access is carried out.And read routine preferably, will be stated from the program storage area of microcomputer under the program of reading, and carry out the mode of this program.The program of this download usefulness is stored in the body apparatus in advance.

In addition, as the said procedure medium is the recording medium that can constitute discretely with body, it also can be the data system of tape or tape, the disc system of the CD of disk such as floppy disk or hard disk, CD/MO/MD/DVD etc., system such as the card of IC-card (comprising storage card) etc. perhaps is loaded with the recording medium that comprises by the fixed routine of the semiconductor memory of mask ROM, EPROM, EEPROM, flash rom etc.

In addition, constitute if can connect the system of the communication network that comprises the Internet, so preferably the program-carried recording medium of Yi Donging makes from the downloaded program.

And during from this downloaded program, preferably the program of this download usefulness is also gone in the body apparatus in advance, perhaps also can be the medium that other recording medium is loaded.

As problem always, just like following, in view of the above, the application's purpose also is as described below.

In the radio communication device always,,, be necessary each packet to be sent the change compression ratio and send number of times again according to error rate owing to set variable bit rate as compression method.In addition, the error rate of the data of reception is big more, requires to improve compression ratio more and send number of times again, like this, the situation that too improves compression ratio is arranged, and sound also might become and can't bear to listen.When being applied to the video transmission, image also might become and can't bear to watch.

The present invention does in view of above-mentioned problem, even if its purpose is to provide under the situation of communications status deterioration, also can be with the degradation inhibiting of video and voice data to Min., strengthen the radio communication device of error tolerance, transmitter, receiver, wireless communication system, Wireless AV system, wireless transmission method and operation control program and write down this program recording medium.

Radio communication device of the present invention also can be a formation described as follows.

Radio communication device, bit rate with regulation transmits the data that comprise video and voice data, comprise: the communications status detecting unit that detects communications status, a plurality of transfer rates of storage combination and the set point memory cell of sending the set point of number of times again, select the set point of storing in the described set point memory cell according to the communications status of described detection, set based on the transfer rate of this selected set point and the transfer rate setup unit that send number of times again.

Described communications status detecting unit also can be according to the electric field strength that receives electric wave, or error rate, or require number of times based on sending again of error rate, detects communications status.

Described communications status detecting unit also can detect the communications status between the radio communication device of establishing communication link.

Described video and voice data also can utilize the mpeg stream according to the mpeg encoded mode to transmit.

Transmitter of the present invention also can be following formation.

Transmitter sends the data that comprise video and voice data with the bit rate of regulation, comprise: receive receiving element from data sender's control information, a plurality of transfer rates of storage combination and the set point memory cell of sending the set point of number of times again, select the set point of storing in the described set point memory cell according to the control information that send to receive, setting is used based on the transfer rate of described set point and is sent the transmitting element of video and voice data with sending number of times again based on the transfer rate of this selected set point and the transfer rate setup unit that send number of times again.

Receiver of the present invention also can be following formation.

Receiver receives video and the voice data with the bit rate transmission of regulation, also can comprise: the receiving element that receives video and voice data, the error identifying unit of the error of determinating receiving data sends to the transmitting element that data send the source with the control information of judging.

The electric field strength of described error identifying unit determinating receiving data, the electric field strength that described transmitting element is judged described error identifying unit sends as control information.

Wireless communication system of the present invention also can be following formation.

Wireless communication system sends the transmitter and the receiver that receive the data that comprise video and voice data by the bit rate with regulation and forms, described receiver comprises: receive the video of described transmitter transmission and the 1st receiving element of voice data, the error identifying unit of the error of determinating receiving data, the control information of judging is sent to the 1st transmitting element of described transmitter, described transmitter comprises: the 2nd receiving element that receives the control information of described receiver transmission, a plurality of transfer rates of storage combination and the set point memory cell of sending the set point of number of times again, control information according to described receiver transmission, select the set point of storing in the described set point memory cell, and set based on the transfer rate of selected set point and give the transfer rate setup unit of number of times again, use based on the transfer rate of described set point and send the 2nd transmitting element of video and voice data with sending number of times again.

Wireless communication system sends the transmitter and the receiver that receive the data that comprise video and voice data by the bit rate with regulation and forms, described receiver comprises: receive the video of described transmitter transmission and the 1st receiving element of voice data, the electric strength identifying unit of the electric field strength of determinating receiving data, the electric field strength of judging is sent to the 1st transmitting element of described transmitter as control information, described transmitter comprises: the 2nd receiving element that receives the control information of described receiver transmission, a plurality of transfer rates of storage combination and the set point memory cell of sending the set point of number of times again, control information according to described receiver transmission, select the set point of storing in the described set point memory cell, and set based on the transfer rate of selected set point and give the transfer rate setup unit of number of times again, use based on the transfer rate of described set point and send the 2nd transmitting element of video and voice data with sending number of times again.

Described transfer rate setup unit also can be sending number of times to send data again with maximum not during round-off error again, reduces transfer rate, and improve and send number of times again.

The electric field strength that described transfer rate setup unit also can detect at receiver side be the specified level of error to take place easily when following, reduce transfer rate, and number of times is sent in raising again.

The error rate of the data that described transfer rate setup unit also can receive at receiver side be during to video and the influential specified level of sound, reduce transfer rate, and number of times is sent in raising again.

When described transfer rate setup unit also can sharply increase at the error rate that receiver side detects, and/or electric field strength reduces transfer rate to lowermost level when sharply reducing.

When described transfer rate setup unit also can slowly increase at the error rate that receiver side detects, and/or electric field strength reduces transfer rate when slowly reducing step by step.

When described transfer rate setup unit also can be in the level that not have to hinder at the error rate that receiver side detects, and/or electric field strength is brought up to the superlative degree with transfer rate when being in the level that does not have obstruction.

When described transfer rate setup unit also can slowly reduce at the error rate that receiver side detects, and/or electric field strength improves transfer rate when slowly increasing step by step.

Described wireless communication system is also applicable to following AV system.

Wireless AV system connects a plurality of radio communication devices by wireless network, and described radio communication device is the wireless communication system of above-mentioned formation.

Described wireless communication system has display unit and broadcast reception tuner, and described display unit also can be the television receiver that constitutes with the center fixture that transmits video and voice data.

Wireless transmission method of the present invention also can be following formation.

Wireless transmission method transmits the data that comprise video and voice data with the bit rate of regulation, it is characterized in that, have: the step that detects communications status, a plurality of transfer rates of storage combination and the step of sending the set point of number of times again, select described set point according to the communications status that detects, set based on the transfer rate of selected set point and the step of sending number of times again.

Control program of the present invention also can be following formation.

Computer is carried out the program of usefulness, transmit in the wireless transmission method of the data that comprise video and voice data at bit rate with regulation, handle each step, promptly detect the step of communications status, a plurality of transfer rates of storage combination and the step of sending the set point of number of times again, select described set point according to the communications status that detects, set based on the transfer rate of selected set point and the step of sending number of times again.

Recording medium of the present invention also can be following formation.

The recording medium of embodied on computer readable, record is carried out the program that following treatment step is used by computer, promptly transmit in the wireless transmission method of the data that comprise video and voice data at bit rate with regulation, handle each step, promptly detect the step of communications status, a plurality of transfer rates of storage combination and the step of sending the set point of number of times are again selected described set point according to the communications status that detects, and set based on the transfer rate of selected set point and the step of sending number of times again.

As above-mentioned detailed description, according to the present invention, in the transmission of video that the wireless transmission according to constant bitrate produces and sound etc., cause is from obstruction on every side, error takes place, and when image and sound generating interference, transmits bit rate by temporary transient the reduction automatically, the maximum that increases error information is sent number of times again, can strengthen the tolerance of error.

In addition, the example or the embodiment that in the optimal morphology item of the usefulness that carries out an invention, propose, all the time be the example of understanding technology contents of the present invention for making, can not only limit to do in such concrete example the explanation of narrow sense, in the scope of spirit of the present invention and claim described below, can do various changes and enforcement.

Industrial practicality

Radio communication device of the present invention be suitable for wireless transmission video and/or voice data, for example display AV network system in the such family of the wireless TV receiver of divergence type, but be not limited thereto, can extensively be suitable for Channel radio in mobile phone/PHS (personal handy phone system), mobile information terminal (PDA (personal digital assistant)) etc. Letter equipment.

Claims

1. a radio communication device transmits the data that comprise video and voice data with the bit rate of stipulating, it is characterized in that, comprising:

According to from the signal of transmit leg, detect the communications status detecting unit of communications status, and

According to the detected communications status of described communications status detecting unit, control described bit rate and transmit the data transfer unit of described data changeably,

When described data transfer unit does not satisfy stipulated standard at detected communications status, temporarily reduce described bit rate and transmit data.

2. radio communication device as claimed in claim 1 is characterized in that,

When described data transfer unit was carried out the data transmission at the reduction bit rate, the detected communications status of communications status detecting unit satisfied stipulated standard as described, just bit rate is brought up to the level of regulation and is transmitted data.

3. radio communication device as claimed in claim 1 is characterized in that,

Comprise that also storage makes the set point memory cell of the set point of sending the number of times combination again of a plurality of bit rates and data,

Described data transfer unit is according to detected communications status, selects to be stored in the set point in the described set point memory cell, with the bit rate of the set point correspondence selected with send number of times again, transmit data.

4. as each described radio communication device in the claim 1 to 3, it is characterized in that,

Utilization transmits described video and voice data according to the mpeg stream of MPEG (Motion Picture Experts Group) coded system.

5. a wireless communication system sends the transmitter and the receiver that receive the data that comprise video and voice data by the bit rate with regulation and forms, it is characterized in that,

Described receiver comprises

The error of the data that judgement receives from described transmitter detects the communications status detecting unit of communications status according to result of determination, and

The communications status that detects with described communications status detecting unit is sent to the control information delivery unit of described transmitter as control information,

Described transmitter comprises

According to the communications status that described communications status detecting unit detects, control described bit rate changeably and transmit the data transfer unit of described data,

Described data transfer unit

When detected communications status does not satisfy stipulated standard, temporarily reduce described bit rate and transmit data.

6. a wireless AV (audio visual) system connects a plurality of radio communication devices by wireless network, it is characterized in that,

Described radio communication device is a radio communication device as claimed in claim 1.

7. a wireless transmission method transmits the data that comprise video and voice data with the bit rate of stipulating, it is characterized in that, comprises following steps:

According to the 1st step from the input communications status of transmit leg, and

According to the communications status that the 1st step detects, control described bit rate changeably and transmit the 2nd step of described data,

When communications status does not satisfy stipulated standard, temporarily reduce bit rate and transmit data in described the 2nd step.

8. a control program is characterized in that,

Making the control program of radio communication device action as claimed in claim 1, is the control program that computer is played a role as above-mentioned each unit.

9. a recording medium is characterized in that,

Be the recording medium of the embodied on computer readable of record control program as claimed in claim 8.