CN1774913A - Radio terminal, base device, wireless system, radio terminal control method, radio terminal control program, and computer-readable recording medium in which that program has been recorded - Google Patents

Abstract

A wireless A/V system comprises a wireless center, which serves as a base device, and a TV body. The TV body includes an SS transmitter/receiver unit that receives MPEG2 streams and command transmission data transmitted from an SS transmitter/receiver unit of the wireless center and that decodes the received MPEG2 streams and others; a TV part that displays video signals and outputs audio signals; a TV microcomputer that controls the whole apparatus; and a second SS-CPU that determines the status of communication between the wireless center and the TV body from the field intensity of a received radio wave and from a re-transmission request based on an error ratio. The TV microcomputer OSD-displays, based on the determined communication status, on the TV part, messages of reception sensitivity information including such indications that the video and audio data have been interrupted, the transmission channels are being changed, the connection is being made and that the communication is impossible due to a blind spot. In this way, even if the video displaying is interrupted due to a change of transmission channels or the like, it would give no unnatural feeling to the user, so that the usability can be improved.

Description

The control method of wireless terminal, base station apparatus, wireless system, wireless terminal, the control program of wireless terminal and write down the computer-readable recording medium of this program

Technical field

The present invention relates to wireless terminal, base station apparatus, wireless system, wireless terminal control method, wireless terminal control program and write down the computer-readable recording medium of this program.

Background technology

In recent years, along with popularizing of internet explosion type, the situation that makes up LAN (local area network (LAN)) in office, family etc. is increasing.Because the trouble of digital wireless communication technological progress and cable distribution, make up LAN, be that the needs of so-called WLAN also become very high with wireless mode, and, because its use also is possible under the mobile environment of portable terminal that with the node type personal computer is representative, therefore just expecting universal platform number at a great deal of in future.As the technology of WLAN representative, have in IEEE (Institute of Electrical and Electric Engineers) by standardized IEEE802.11.This standardized technology has become a standard, it has predesignated the low layer from the physical layer to the data link in osi model be MAC (media interviews control) layer, can be Ethernet (login trade mark) displacement with the wired lan transmission line, and, can also provide roaming (roaming) as wireless additional function.

At present, advancing the preparation of the new received terrestrial digital broadcasting that is substituted in the analogue terrestrial broadcast of watching in the Japanese whole nation.This received terrestrial digital broadcasting plan began in the Northeast, closely fine, 3 metropolitan regions in the East Sea in 2003, expanded the whole nation in 2006.Present thereupon analog broadcasting also is predefined in 2011 and abrogates.

ISDB (Integrated Services Digital Broadcasting: the integrated service digital broadcasting) be the design that the integrated digital of future generation that all information such as video, sound, data are handled as numerical data is broadcasted.As the concrete business of ISDB, studying digital television broadcasting, digital audio broadcasting, faxcasting, multimedia broadcasting etc.As the transmission path of ISDB, considering to utilize satellite broadcasting ripple, terrestrial broadcasting ripple, coaxial cable and optical fiber wire transmission circuit.

At the technical specification ISDB-T of received terrestrial digital broadcasting (Terrestrial: ground), the OFDM of a plurality of carrier waves is used in employing on modulation system (Orthogonal Frequency DivisionMultiplexing: OFDM), it can also suppress to disturb because of mansion reflection etc. causes the ghost image that is caused by a plurality of propagation paths.In ISDB-T, separate provision the set time-axis direction of modulation system, each effective code element length of a plurality of transmission modes that are used for the regulation carrier spacing and each carrier wave protection at interval, in specification, allow very many signal forms.In fact, among them, select only form according to business such as fixing reception and mobile receptions.

At ISDB-T, a transmission channel (communication channel) (the about 5.6MHz of frequency band) is divided into 13 sections (1 section=about 430kHz), become as unit thus and change modulation system.By this, broadcasting office can determine arbitrarily that signal constitutes, so that carry out sound radio and television broadcasting, standard fixed broadcasting and moving body broadcasting on a transmission channel.

And, adopt the electric wave that interweaves (interleave) and utilize of time-axis direction also to be applicable to transmission from ISDB-T to moving body, one of its feature is: even such as moving body receivers such as in-car TV, PDA (personal digital assistant) with such as the portable terminal device of portable phone, also can carry out stable reception.From now on, the business of estimating this mobile reception will greatly be expected.

Yet, in wireless network, under the situation that transmitter, the receiver frequency (transmission channel) specific with certain communicates, at other receiver, transmitter when having used identical transmission channel, because the frequency band of transfer of data reduces, after this use the equipment of transmission channel need automatically be altered on the idle transmission channel.

Wireless Telecom Equipment as the change transmission channel, for example in patent documentation 1, wireless communication part is made corresponding with 2.4GHz frequency band and 2 frequency bands of 5GHz frequency band by front end (front end) circuit that the 2.4GHz frequency band is set with the front-end circuit of 5GHz frequency band, make to increase considerably the transmission band number that in the same area, can set simultaneously, and reduce by disturbing electric wave to cause the danger of interrupted communication link at Wireless LAN system.

Patent documentation 1: Japan openly speciallys permit communique " spy open 2002-33676 communique (open day: on January 31st, 2002) " (Fig. 1).

But, in this prior art Wireless Telecom Equipment, when switching transmission channel, because Communications status interrupts, therefore display video not, and existing the user not distinguish is the situation that image interrupts Or the problem of situation of communication terminal change transmission channel and so on.

Summary of the invention

The present invention is used to address the above problem and proposes, its purpose be to provide a kind of wireless terminal, base station equipment, wireless system, wireless terminal control method, wireless terminal control program and write down the computer-readable medium storing of this program, even the demonstration of video because of interrupted situations such as transmission channel changes under, also can not make user's unhappiness, thereby improve user's ease of use.

The object of the present invention is to provide a kind of wireless terminal, base station equipment, wireless system, wireless terminal control method, wireless terminal control program and write down the computer-readable medium storing of this program, it can keep only communications status as much as possible on whole network.

In order to solve above-mentioned problem, wireless terminal of the present invention is characterised in that and comprises: SS sends receiving element (communicator), and the transmission of carrying out video and/or voice data with base station equipment or having comprised the control command of transmission channel modification information receives; SS-CPU (communications status checkout gear) detects communications status; And TV portion (device for informing), based on the communications status that described SS-CPU (communications status checkout gear) detects, report the status transmission of described control command at least.

The control method of wireless terminal of the present invention, be used for the wireless system that wireless terminal and base station equipment are connected by wireless network, it is characterized in that: the transmission of carrying out video and/or voice data with base station equipment or comprising the control command of transmission channel modification information receives, detect communications status, based on the described communications status that detects, report the status transmission of described control command at least.

According to said structure, can report the status transmission that sends the control command that receives in wireless terminal and the base station equipment.As this control command, for example, can utilize base station equipment to exist and ' ack signal ' that ' confirmation signal ' that send and the wireless terminal that receives the confirmation signal send etc. as the wireless terminal of communication counterpart in order to confirm.And when the transmission state of control command worsened, wireless terminal showed to the user as reporting message etc.As reporting message, for example also can when electric wave is difficult to receive, show ' circle outer ', when the electric wave state difference, show ' electric wave is difficult to receive ', when the change transmission channel is searched for the transmitter that will communicate by letter, show ' searching for transmitter ', find the transmitter that to communicate by letter and connecting when setting demonstration ' in the connection ' etc.

Therefore, according to above-mentioned wireless terminal,, can improve user's ease of use even under the situation that the demonstration of video is interrupted because of transmission channel change etc., also can make the user not produce unhappiness.

And wireless terminal of the present invention has following feature: comprise the TV microcomputer, and the time of this computer measurement communication disruption, and till this communication disruption is extremely passed through official hour, keep channel.

According to said structure, also can prevent the frequent switching of transmission channel, thereby keep the only communications status of network integral body as far as possible.

Other purposes of the present invention, feature and advantage are clearer and more definite by record shown below.In addition, of the present invention being in well with reference to can be clearer in the following explanation of accompanying drawing.

Description of drawings

Fig. 1 is the block diagram of the Wireless AV system structure of expression embodiment of the present invention.

Fig. 2 is the block diagram of the wireless center structure of expression Wireless AV system shown in Figure 1.

Fig. 3 is the block diagram of the TV body construction of expression Wireless AV system shown in Figure 1.

Fig. 4 is the state transition graph that is used for illustrating Wireless AV system transmission channel variation shown in Figure 1.

Fig. 5 is the state transition graph that is used for illustrating Wireless AV system transmission channel variation shown in Figure 1.

Fig. 6 is the state transition graph that is used for illustrating Wireless AV system transmission channel variation shown in Figure 1.

Fig. 7 is the state transition graph that is used for illustrating Wireless AV system transmission channel variation shown in Figure 1.

Fig. 8 is a plurality of transmitter-receiver A of expression Wireless AV system shown in Figure 1, B, and the data of C send the schematic diagram that receives.

Fig. 9 is that a plurality of transmitter-receiver A of explanation Wireless AV system shown in Figure 1, the transmission channel of B, C use the schematic diagram of example.

Figure 10 is the key diagram of summarizing the summary of expression Wireless AV system shown in Figure 1.

Figure 11 is the key diagram that sends the control command that receives between expression wireless center of Wireless AV system shown in Figure 1 and the TV body.

Figure 12 is the flow chart that is illustrated in the TV body of Wireless AV system shown in Figure 1 the processing of judging " circle is outer ".

Figure 13 is the flow chart that is illustrated in the TV body of Wireless AV system shown in Figure 1 the processing of judging " circle is outer ".

Figure 14 is the flow chart that is illustrated in the wireless center of Wireless AV system shown in Figure 1 the processing of judging " circle is outer ".

Figure 15 is the flow chart that is illustrated in the wireless center of Wireless AV system shown in Figure 1 the processing of judging " circle is outer ".

Figure 16 is the flow chart that is illustrated in the determination processing of communications status in the TV body of Wireless AV system shown in Figure 1.

Figure 17 is illustrated in the flow chart that the transmission channel change is handled in the wireless center of Wireless AV system shown in Figure 1 and the TV body.

Figure 18 is the key diagram of an example of the transmission channel change of expression wireless center of Wireless AV system shown in Figure 1 and TV body.

Embodiment

Below, describe embodiments of the invention in detail with reference to accompanying drawing.

The invention is not restricted to the foregoing description, without departing from the present invention, can carry out various changes and modifications.

Fig. 1 is the block diagram of expression embodiment of the present invention Wireless AV system 1 structure.As the Wireless AV system 1 of present embodiment, be the example that is applicable to the wireless TV receiver of displays separated type.Figure 10 is a key diagram of having represented that the wireless TV receiver of displays separated type is the summary of Wireless AV system 1.

As Fig. 1 and shown in Figure 10, Wireless AV system 1 is by constituting as the wireless center unit (hereinafter referred to as wireless center) 2 of base station equipment with as TV (TV) body unit (hereinafter referred to as the TV body) 3 of portable terminal (wireless terminal).Wireless center 2 (radio communication device, center fixture) and TV body 3 (radio communication device, display unit) form to and constitute wireless-transmission network.

As shown in figure 10, TV body 3 is that battery is built-in and be wireless.By remote controller is installed, can carry out the straighforward operation of video mechanism (video deck) etc.Wireless center 2 is connected on the AV equipment etc. of antenna, DVD player and video mechanism etc. of BS and U/V etc.Like this, video and/or voice data are transmitted wirelessly to TV body 3 from wireless center 2.

As shown in Figure 1, wireless center 2 comprises each antenna terminal of BS terminal 11, U/VHF antenna terminal 12, diversity terminal 13 and video 1 input terminal (having the S terminal) 14, video 2 input terminals (decoder input) 15, video 3 input terminals (monitor/BS exports dual-purpose) 16, AC power supplies portion 17 and the Car-DC power supply unit 18 that connects equipment such as digital VTR, DVD player.

TV body 3 comprises video 4 input terminals (TV exports dual-purpose) 21, AC power supplies portion 22 and the Car-DC power supply unit 23 that connects equipment such as digital VTR, DVD (digital universal disc) player.

TV body 3 be comprise can separate with wireless center 2 by battery built-in cause can be portable or mobile thin-type display device notion widely such as various display unit such as liquid crystal TV set (hereinafter referred to as LCD TV), inorganic EL/ OLED display, plasma scope for example, not limited by indication mechanism.In this manual, TV body 3 has Presentation Function and audio function etc. as main body, and on the other hand, wireless center 2 has mainly been accommodated and has been used to controlled function of controlling tuner portion and TV body 3 etc.The TV main body 3 of present embodiment describes the LCD TV of thin-type display device as an example.

Between wireless center 2 and TV body 3, pass through SS (Spread Spectrum: wireless mode transmitting and receiving data (video and/or voice data) spread spectrum) according to the IEEE802.11 specification.Recently, can make 5GHz open, use 5GHz to replace the form of 2.4GHz as frequency band.From wireless center 2 to the transfer of data of TV body 3 use MPEG (Moving Picture ExpertGroup: mobile motion picture expert group version) 2 video compression format, transmit moving image transmitting defeated and DVD video and digital broadcasting with the communication line that surpasses 10Mbps.Instruction between wireless center 2 and the TV body 3 (control command that comprises the transmission channel modification information) transmission is undertaken by the SS wireless mode.

At the stream (bit string) of the coding that comprises MPEG video or mpeg audio, also have other encoding stream and be applied under the situation in the actual application, need comprise synchronously and with encoding stream multiplexing and concentrated be one, this stream is made as is suitable for the intrinsic physical format that storage medium or network etc. have or the data format of agreement simultaneously.

In the MPEG2 system, have program flow (MPEG2-PS, PS:Program Stream) that constitutes a program and the transport stream (MPEG2-TS, TS:Transport Stream) that can constitute a plurality of programs equally with MPEG1.

Mpeg stream is most marks (flag) that 1 bit all arranged but carries out the byte stream of byte align with the constituent parts of each head etc.In mpeg system integral body, has following data structure: do not having the data division of regular length as sharing structure, the information of expression length is placed earlier, under discarded situation, skip this part, confirm the beginning of next data set, thereby can carry out the high separating treatment of reliability.

Meet the MPEG2 coded system, and receive the device of compressed video, voice signal, for prevent the decoding side-looking frequently, the overflowing of voice data, need make video, sampled voice frequency or the STC (System Time Clock) of video, sampled voice frequency and decoding side of coding side consistent.

Therefore, in decoding device, pass through to use the PCR (Program Clock Reference: program is the benchmark reference point constantly) or SCR (the SystemClock Reference: system time benchmark reference point), make video, the sampled voice frequency of video, the sampled voice frequency of coding side and the side of decoding consistent that press MPEG2 standard (ISO/IEC standard 13818-1) regulation.

Fig. 2 is the block diagram of structure of the wireless center 2 of the above-mentioned Wireless AV system 1 of expression.

In Fig. 2, wireless center 2 comprises with lower device and constituting: BS tuner 31, by the 41 pairs of BS broadcasting of channel selecting signal that are connected to BS terminal 11 receive, channel selection; U/VHF tuner 32,41 pairs of U/VH broadcasting of the channel selecting signal by being connected to U/VHF antenna terminal 12 receive, channel selection; Image/sound demodulation section 33 is to carrying out demodulation by BS tuner 31 or 32 receptions of U/VHF tuner, the image of channel selection, sound (AV) signal; Sound switching part 34, the sound that will receive by audio switching signal 42 and about EPG (Electrical Program Guide: electronic program guides) constant pitch purpose information is switched; First selector 35, image, acoustic information that selection and source select signal 43 to receive, about the information of program, from the outside input information of video 1 input terminal (outside input 1) 14, video 2 input terminals (decoder input) (outside input 2) 15, video 3 input terminals (dual-purpose monitor/BS output) (outside input 3) 16; Send receiving element 36 (communicator), send and receive television set command signal 44, the data conversion that will be selected by first selector 35 is the image compression format of MPEG2, sends to television set body 3 by the SS wireless mode; Wireless center microcomputer (hereinafter referred to as microcomputer) 37 (control device) sends channel selecting signal 41, audio switching signal 42, source selection signal 43 etc., sends simultaneously and receives television set command signal 44, thereby carry out the control of device integral body; And as EEPROM (the electrically erasableprogrammable ROM of the nonvolatile memory of electrically rewritable, electricallyerasable ROM (EEROM)) 38, the control program of storage wireless center microcomputer 37, communication control data, the various data that also have transmission channel to alter the procedure etc.

Wireless center 2 possesses a plurality of (being 2 here) send to receive and use tuner, and at least one is that can to carry out the tuner of received terrestrial digital broadcasting reception just passable in a plurality of BS tuners 31, the U/VHF tuner.

SS sends receiving element 36 and comprises with lower device and constituting: A/D transformation component 51, and the data conversion that will be selected by first selector 35 be a digital signal; MPEG2 decoder 52 is the image compression format of MPEG2 with data conversion; The SS wireless transmission receives engine (engine) 53, constitutes by wireless machine of SS and the radio control section that the SS wireless mode sends by sending data; And a SS-CPU54, control SS sends the each several part of receiving element 36, detects the electric wave state simultaneously.

The SS wireless transmission receives engine 53 and comprises that the SS to television set body 3 sends the sending function that receiving element 61 (back is narrated) sends MPEG2 stream or instruction etc. in Fig. 3, and and SS send the receiving function that receives instruction etc. between the receiving element 61.

Be written into program among the EEPROM38 by change, can change all size in wireless center 2 and the television set body 3.That is,, and program (program) ROM is made as nonvolatile memory, for example EPROM, EEPROM, realizes program development, the reduction significantly of correction time recently for fear of the loss of time to the debugging change mask rom of each system development.In addition, if download and rewrite the contents of program of EEPROM, then can easily carry out the upgrading of function or the change of function.

Fig. 3 is the block diagram of structure of the television set body 3 of the above-mentioned Wireless AV system 1 of expression.

In Fig. 3, television set body 3 comprises: SS sends receiving element 61 (communicator), send and receive television set command signal 71, and receive MPEG2 stream or the instruction transmission data that send from the SS transmission receiving element 36 of wireless center 2, the MPEG2 that receives is flowed wait decoding (recovery) to be former data simultaneously; Second selector 62 selects signal 72 to select by the data of SS transmission receiving element 61 recoveries with via video 4 input terminals (output of dual-purpose television set) (outside input 4) the 21 AV signals from the outside input by the source; Television set portion 63 (part of device for informing) is made of the LCD of display image signals and output sound signal, loud speaker etc.; OSD synthesizes portion 69, carries out original image and OSD (On Screen Display shows on the screen) demonstration and doubling of the image processing such as television broadcasting by OSD output signal 73; Television set microcomputer 64 (part of device for informing, control device) sends and receives television set command signal 71, sends unit simultaneously and selects signal 72, OSD output signal 73 etc., thereby carry out the control of device integral body; As the EEPROM65 of the nonvolatile memory of electrically rewritable, control program, the communication control data of storage television set microcomputer 64, the various data that also have transmission channel to alter the procedure etc.; Remote controller light receiver 66 (remote operation signal receiving device), never illustrated remotely controlled plant (hereinafter referred to as remote control) receives control command; Battery 67; And battery charge microcomputer 68, control discharging and recharging of battery 67.

SS sends receiving element 61 and comprises with lower device and constituting: the SS wireless transmission receives engine 81, is made of the wireless machine of SS and the radio control section that receive the data that send by the SS wireless mode; MPEG2 decoder 82 is decoded to the MPEG2 stream that receives; D/A transformation component 83 is an analog signal with decoded data conversion; And the 2nd SS-CPU84 (communications status checkout gear), control SS sends the each several part of receiving element 61, detects the electric wave state simultaneously.

The SS wireless transmission receives engine 81 and comprises: receive the receiving function that SS from wireless center 2 sends the MPEG2 stream of receiving element 36 or instruction etc.; And send the sending function that receiving element 61 sends instruction etc. from SS.

Particularly, the 2nd SS-CPU84 comprises the function as the electric wave condition checkout gear, the electric field strength by receiving electric wave, error rate, detects communications status (power of electric wave, the interference of communication path) between wireless center 2 and the television set body 3 based on the request that sends again of error rate.The information of representing detected electric wave state is sent to television set microcomputer 64 as television set command signal 71.In addition, also can send receiving element 36 and instruct transmission the SS of wireless center 2.In the present embodiment, represented that the 2nd SS-CPU84 of television set body 3 possesses the structure of above-mentioned electric wave measuring ability, but a SS-CPU54 that also can be wireless center 2 comprises same function, and the information that will represent detected electric wave state from wireless center 2 is instructed transmission manner to television set body 3.Perhaps, also can be the structure that a SS-CPU54 and the 2nd SS-CPU84 both sides possess the electric wave status detection function.And then, also can be the mode that television set microcomputer 64 or wireless center microcomputer 37 carry out above-mentioned electric wave status detection function.

Television set microcomputer 64 carries out the control of device integral body, has function simultaneously as device for informing, based on detected communications status, notice image and voice data can interrupt, be in the transmission channel change, are in the connection, comprise to communicate by letter and enclose each message of outer receiving sensitivity information.

In addition, the time that television set microcomputer 64 is measured communication disruption, the transmission channel change control of carrying out till the setting-up time of this communication disruption process regulation, keeping transmission channel.In addition, television set microcomputer 64 has OSD function portion takes place in inside, and be controlled at the channel of display program on the picture of television set etc., constantly, information such as volume.In electronic equipments such as image devices such as television set, video conference system, general on TV set image display program channel, constantly, information such as volume.The data of OSD are not images, but keep with the form that is called bitmap, are transformed to the pixel value of the YUV form of being represented by Y, Cb, Cr from this bitmap, and the pixel of this conversion is superimposed on the original image of television broadcasting etc.In addition, video 4 input terminals (output of dual-purpose TV) are if connect not shown image playback apparatus such as DVD on 21, thus then in display frame overlapping reproduced picture can carry out OSD and show.In addition, the synthetic portion 69 (Fig. 4) of OSD carries out the doubling of the image that original image such as television broadcasting and OSD show and handles.

As mentioned above, the channel of TV microcomputer 64 display programs.Here, based on by and wireless center 2 between send to receive the channel that information that control command obtained is come display program.That is, TV microcomputer 64 can show the information of the wireless center 2 that has been established communication link based on the control command that is received.

In addition, though omitted diagram, but television set body 3 can be following structure also: comprise loud speaker, key input part, be used to plug the slot of the outside expansion storage medium of cassette etc., thereby the outside expansion storage medium of cassette is installed in this slot directly reading of data.The outside expansion storage medium of cassette for example be by SRAM (Static RAM, the static random access memory) card of the information that keeps writing by power supply support (backup) or the pocket flash memory (Compact Flash) that do not need flash memory (flash memory) formations of etc.ing that power supply supports (CF) (registered trade mark), micro medium (Smart Media) (trade mark), memory stick (trade mark), also have and big or small on an equal basis the microminiature hard disk drive (HDD) among the PC card TypeII etc. that maybe can be installed in of pocket flash memory (registered trade mark).

Remote controller light receiver 66 is to use IR, and (Infrared Rays: optical communications port portion infrared ray) receives from the light signal that television set body 3 or wireless center 2 is carried out the remote control of various operations.Specifically, be used to meet as IrDA (Infrared DataAssociation), the ASK (Amplitude Shift Keying) that utilize the standard of infrared transmission data thus etc. carry out the I/O port of optical communication, or the wireless communication port by electric wave.

67 pairs of television set body 3 each several parts of battery are supplied with the power supply of regulation.When battery charge microcomputer 68 becomes chargeable state at battery 67, for example detect the situation that television set body 3 is installed to wireless center 2 or other carriage (cradle), the control that discharges and recharges by electric power feeding terminal (all not shown) for the charging medium of battery 67.Battery charge microcomputer 68 adds up the discharging current of battery pack particularly, begin charging during smaller or equal to setting in the residual capacity that is judged as battery pack, when charging, accumulative total is to the charging current of battery pack simultaneously, and be judged as battery pack when being fully charged state, stop charging.The battery 67 that is recharged becomes the main power source that carries television set under the situation that television set body 3 separates from source power supply, and to the body supply capability.

Below, the action of Wireless AV system 1 as constituted above is described.

Fig. 4 to Fig. 7 is the schematic diagram of expression status transition, is used to illustrate the transmission channel variation of Wireless AV system 1.Transition when Fig. 4 represents (1) starting, Fig. 5 represents (2) transition from (receiving sensitivity is good) in normally watching, and Fig. 6 represents (3) transition from the receiving sensitivity deterioration, and Fig. 7 represents that (4) are from the outer transition of circle.This transmission channel change control realizes by the TV microcomputer 64 of TV body 3.Among the figure, label is represented the reference number (step number) that is used to illustrate.

Transition when (1) starting

When connecting the power supply of TV body 3 (S101), by OSD output 73 " in the connection " is presented at (S102) in the TV portion 63, and becomes bootwait (S103).Show and " in the connection " only when RC " turn-on time ", " opening time " input, to be shown." do not set clock and watch " and be presented at when starting and do not show.

When 3 startings of TV body, carry out channel selection (S104) from the control command of remote control by light-receiving.In order to describe this channel selection action in detail, as shown in Figure 3, instruct transmission received signal 71 to send to SS as TV the control command of relevant this channel selection to the TV microcomputer 64 that carries out light-receiving from the control command of remote control and send receiving element 61, the SS of TV body 3 sends receiving element 61 and sends receiving element 36 by the SS that the SS wireless mode sends it to wireless center 2 shown in Figure 2.The control command that relates to channel selection that SS transmission receiving element 36 will receive sends to wireless center microcomputer 37 as TV control transmission received signal 44.Wireless center microcomputer 37 is accepted this control command and channel selecting signal 41 is sent to BS tuner 31 or U/VHF tuner 32, finishes channel selection by this tuner 31,32.Like this, between wireless center 2 and TV body 3,,, send the reception director data by wireless center 2 and TV body 3 for the instruction transmission although data are sent to TV body 3 as MPEG2 stream from wireless center 2 by the SS wireless mode basically.Although above-mentioned is the example of the instruction transmission of relevant channel selection,, also carry out same instruction transmission even select for sound and information source.

Turn back to the explanation of Fig. 4 (1) when starting transition, TV microcomputer 64 serve as that receiving sensitivity (S105) is differentiated in the basis whether well with the wireless center 2 that detected by the 2nd SS-CPU84 and the information of the communications status between the TV body 3 (power of electric wave, the interference of communication line).If receiving sensitivity is good, just remove quiet (mute) (S106), cancellation " in the connection " (S107), and carry out the transition to Fig. 5 (2) normally watch in the transition state (S108) of (receiving sensitivity is good).This is quiet to be that signal connects the no video/tone-off processing that is used to eliminate video/sound noise when switching.

Thus, behind the power connection of TV body 3, before channel selection finishes, by OSD output 73 " in the connection " is presented in the TV portion 63, still, because receiving sensitivity is good, therefore directly eliminate the demonstration of " in the connection ", and during (2) that carry out the transition to Fig. 5 normally watch.

If receiving sensitivity is bad in the judgement of above-mentioned steps S105, then differentiate whether deterioration (S109) of receiving sensitivity.When the receiving sensitivity deterioration, remove quiet (S110), will " electric wave is difficult to receive " be presented at (S111) in the TV portion 63 by OSD output 73, and carry out the transition to the transition state (S112) of Fig. 6 (3) from the receiving sensitivity deterioration.

If receiving sensitivity does not have deterioration in the judgement of above-mentioned steps S109, judge that then receiving sensitivity worsens (S113), when receiving sensitivity worsens, do not remove quiet, by OSD output 73 " circle is outer " is presented at (S114) in the TV portion 63, and carries out the transition to Fig. 7 (4) from the outer transition state (S115) of circle.

Like this, behind the power connection of TV body 3, show " in the connection ", if the good just elimination " in the connection " of receiving sensitivity if receiving sensitivity is bad, just shows that in " in the connection " back shows " electric wave is difficult to receive " or " outside enclosing ".Therefore, when the user is switched transmission channel, can easily know be in the connection, accepting state worsens makes video breaks or communication terminal change transmission channel.

(2) from the transition of (receiving sensitivity is good) in normally watching

When being in (S201) when normally watching state,, then differentiate the deterioration (S202) of receiving sensitivity if make the information input of communications status (power of electric wave, the interference of communication line) by the 2nd SS-CPU84.When the receiving sensitivity deterioration, will " electric wave is difficult to receive " be presented at (S203) in the TV portion 63 by OSD output 73, and carry out the transition to the transition state (S204) of Fig. 6 (3) from the receiving sensitivity deterioration.

Whether if receiving sensitivity is not a deterioration in the judgement of above-mentioned steps S202, then differentiating receiving sensitivity is to worsen (S205).When receiving sensitivity worsens, carry out quiet (S206), by OSD output 73 " circle is outer " is presented at (S207) in the TV portion 63, and carries out the transition to Fig. 7 (4) from the outer transition state (S208) of circle.When receiving sensitivity does not worsen in the judgement of above-mentioned steps S205, suppose not carry out transition (S209) less than variation.

(3) from the transition of " electric wave be difficult to receive " (receiving sensitivity deterioration)

When being in the receiving sensitivity degradation mode (S301), serve as whether basis differentiation receiving sensitivity improves (S302) with communicate status information from the 2nd SS-CPU84.If receiving sensitivity is improved, then cancellation " electric wave is difficult to receive " shows (S303), and carries out the transition to the transition state (S304) of Fig. 5 (2) from (receiving sensitivity is good) in normally watching.

If receiving sensitivity is not improved in the judgement of above-mentioned steps S302, then differentiate receiving sensitivity and whether worsen (S305).When receiving sensitivity worsens, carry out quiet (S306), the OSD output 73 that worked of going forward side by side will switch to " circle is outer " from " electric wave is difficult to receive " and be presented at (S307) in the TV portion 63, and carry out the transition to Fig. 7 (4) from the transition state (S308) outside the circle.When receiving sensitivity does not worsen in the judgement of above-mentioned steps S305, differentiate the stipulated time (being 10 seconds) here and whether pass by (S309).When 10 seconds past tenses, the demonstration (S310) of cancellation " electric wave is difficult to receive ".When except 10 seconds in the past the time, differentiate the receiving sensitivity deterioration state and whether passed through the stipulated time (being 15 minutes) here (S311), when 15 minutes past tenses, judgement communication disruption and stipulated time go over, and will " electric wave is difficult to receive " be presented at (S312) in the TV portion 63 again by OSD output 73.When in the judgement of above-mentioned steps S311, during not through 15 minutes, not handling (S313).

(4) from the outer transition of circle

When being in the receiving sensitivity deterioration state (S401), serving as whether basis differentiation receiving sensitivity improves (S402) with communicate status information from the 2nd SS-CPU84 at " circle outer ".If receiving sensitivity is improved, then carry out being shown to the switching (S403) of " the connection ", and carry out channel selection (S404) from " electric wave is difficult to receive ".The concrete operations of channel selection have been described.Then, remove quiet (S405), cancellation " in the connection " (S406), and carry out the transition to Fig. 5 (2) normally watch in the transition state (S407) of (receiving sensitivity is good).

When receiving sensitivity in the judgement of above-mentioned steps S402 is not improved or is in deterioration state, do not handle (S408)." circle is outer " shows continuation at this moment.

Describe above-mentioned status transition as an example in detail with the situation that has a plurality of transmitter-receivers.

Fig. 8 is that the data of a plurality of transmitter-receiver A of expression, B, C send the schematic diagram that receives, and Fig. 9 is the schematic diagram that the transmission channel of a plurality of transmitter-receiver A of explanation, B, C uses example.

In Fig. 8 and Fig. 9, transmitter A is the wireless center 2 of for example above-mentioned liquid crystal TV, and receiver A is a TV body 3.Transmitter B, C be Wireless AV system remove the wireless center of above-mentioned liquid crystal TV with external equipment, receiver B, C are its portable terminal devices etc.

As the technology that is used to realize Wireless AV system, for example have and finish the standardized HAVi of being called as (Home Audio/Video Interoperability: the home audio/video interoperability) specification standards of structure in January, 2000.As recording and narrating in the summary part (1.1 parts of general provisions 1) of HAVi V1.0 specification version, this standard realizes providing a kind of interface, and it makes the user operate other equipment by using existing device by the Household Electrical goods are connected with computer.In HAVi standard book, as an example, by (InternationalElectrotechnical Commission: International Electrotechnical Commissio) 61883 Household Electrical goods come the structure of hypothetical network according to IEEE1394 and IEC.Partly have as standard book summary, all users can freely use the equipment of being realized by HAVi that network connected.Like this, make up the AV network by connecting the AV equipment that has in the family, even the equipment that has in the room that the user leaves also can use by independent assortment.

In this family the AV network, transmitter-receiver A, B, C can be that (Personal Handy-Phone System: personal handyphone system) (login trade mark) and portable information terminal (are called PDA wireless communication terminals such as (PersonalDigital Assistants: the personal digital assistant)) later on to the pocket telephone/PHS that for example carries out radio communication.

On the other hand, as Wireless AV system, use WLAN, bluetooth and UWB (UltraWide Band: ultra broadband).WLAN is widely used in portable data assistances such as the portable node type personal computer with WLAN function, PDA.In the portable telephone that requires more low power consumption, pay close attention to closely twocouese communication of little electric power such as bluetooth, UWB.Bluetooth is to carry out the closely system of twocouese radio communication between main frame (server) and slave (client), and in order also can to carry out the communication of equipment room Anywhere on earth, so it uses in the whole world employed 2.4GHz frequency band.Now the communication speed under the specification is 1Mbps, future plan modification to 2Mbps.The speed of actual transmissions channel can be carried out communication in synchronous audio communication under 3 transmission channels or the voice and data under a transmission channel.At asynchronous channel, support the 721Kbps twocouese to connect and be connected or the link of the symmetry in 432.6Kbps with the 57.6Kbps Return-ing direction.

Fig. 9 is the schematic diagram of the transmission channel variation of this Wireless AV system of explanation.This Wireless AV system is under the situation according to the IEEE802.11 specification, although the frequency of 14 transmission channels from transmission channel ch1 to transmission channel ch14 is assigned in the frequency band of 2.4GHz of 2.400～2.483GHz, but in areal, set simultaneously under the situation of a plurality of transmission bands, determine to make the frequency interval of adjacent transmission band as more than the 25MHz.This be because, because the high-frequency signal that is sent out reception has modulated constant frequency band, therefore when the frequency of adjacent transmission channel near the time, the signal of each transmission channel becomes the electric wave of phase mutual interference for the other side.Therefore, the transmission channel number that can set simultaneously in areal is as shown in Figure 9 as transmission channel A, B, shown in the C (diagram is omitted transmission channel C) like that maximum be limited to 3 transmission channels.As above-mentioned, in the intensive region of dwelling house and in the close building in room, if do when each dwelling house and room make up Wireless LAN system in pairs, it is not enough to produce transmission channel.

Therefore, in wireless network, under the situation that transmitter and receiver communicate with certain characteristic frequency (transmission channel), other transmitter and receiver to the situation of using the identical traffic frequency band under, after this use the machinery requirement of transmission channel to be altered to idle transmission channel.

At the example of Fig. 9, by using transmission channel A, transmitter A carries out packet communication to receiver A.At this moment, under the situation that transmitter B communicates, because transmitter A uses transmission channel A, transmitter B is that transmission channel B comes to carry out packet communication with receiver B with regard to becoming use transmission channel A transmission channel in addition.Here, under the situation that transmitter C also communicates,, therefore use transmission channel A, B transmission channel C in addition to communicate because transmitter A uses transmission channel A, transmitter B to use transmission channel B.

Yet,, have and can not judge easily whether other transmitters (for example transmitter A) carry out the situation of packet communication from transmitter C.Promptly, when in transmitter A under any reason not during transport stream when video is stopped (for example press stop button), if transmitter C begins at random to use after the transmission channel A by it being judged as the idle transmitter C that makes of transmission channel A, when transmitter A communicates again, transmission channel A is owing to used by transmitter C, so transmitter A must sound out new transmission channel.In the switching of transmission channel,, therefore need about 3 seconds owing to go back processing such as input initialization.

Also be the state that stream interrupts originally in the transmission channel change.Therefore, in the present embodiment, describe in detail in Fig. 7 as Fig. 4, when switching transmission channel, when communications status interrupts, by the user by message such as " in the connection ", " exploration transmission channel ", " electric wave be difficult to receive ", " circle is outer " (can for display message, voice message with and any one of combination) know to be which of video breaks, transmitter-receiver change transmission channel, make the user can not produce sticky feeling.

And, in present embodiment, measure the time of communication disruption in certain transmission channel, and when time of communication disruption for the setting time-out time of regulation within the time judge that this transmission channel is control just in use.This control is the control that the control part of transmitter-receiver carries out, and for example, arrives under the situation of Wireless AV system shown in Figure 3 for Fig. 1, and it is realized by wireless center microcomputer 37 and/or TV microcomputer 64.And, measure processing and the judgement processing in use of the time of communication disruption and undertaken by the control part that hypothesis has been inserted into the equipment of transmission channel.

Example at Fig. 9, when making transmitter A when receiver A carries out packet communication by use transmission channel A, under the situation that transmitter B communicates, because transmitter A uses transmission channel A, so the transmission channel that transmitter B becomes outside the use transmission channel A is that transmission channel B comes to carry out packet communication with receiver B.Here, in the moment shown in Figure 9, when transmitter C also communicates, though the packet communication of the grouping of transmitter A and transmitter B interrupts, but owing to all be to set in the time-out time, therefore transmission channel A and transmission channel B are judged as in use, and transmission channel A or transmission channel B are not sent out machine C and use.Thus, can prevent possibly that transmission channel from being switched continually, can in whole network, keep only communications status.

Below, use Figure 11 to Figure 15, the detection method that is in " circle is outer " is described.And, although detecting to handle in wireless center 2, this carries out by a SS-CPU, in TV body 3, handle by the 2nd SS-CPU, also can carry out by wireless center microcomputer 37 and/or TV microcomputer 64 respectively.

Figure 11 is illustrated between transmitter suitable with wireless center 2 and the receiver suitable with TV body 3 and sends the signal that receives.Here, confirmation signal is to be used to confirm that the other side exists and the signal that sends.Ack signal is a signal of representing to receive the confirmation the meaning of signal, is to receive the confirmation the signal that signal side sends.Confirmation signal also can be the instruction signal.And, owing to be this twocouese communication, therefore by finding the state of data, even also can hold accepting state at transmitter side.

And, example at Figure 11, although each confirmation signal is sent ack signal, but after receiver receives confirmation signal, even not confirmation of receipt signal also can send ack signal termly, by omitting confirmation signal fully, even not confirmation of receipt signal also can send ack signal termly.

Figure 12 is illustrated in the processing of confirmation of receipt data side (being receiver under this situation).At first, counter is set to 0 (S1201), and waits for certain hour (T second) (S1202).Judge whether receive the confirmation signal (S1203) at the certain hour waiting time.When receiving the confirmation signal (being among the S1203), send ack signal (S1204).On the other hand, when not receiving the confirmation signal, (be "No" among the S1203), make counter increase by 1 (S1205).Then, the value and the predetermined setting of counter compared (S1206), when count value than setting hour ("No"), turn back to pending (S1202) such as certain hours.On the other hand, when count value surpasses setting (being among the S1206), then be judged as circle outer (S1207).

Here, setting is the value that is associated with pending time T such as certain hour, and T second * setting became about 5 seconds.And the value of setting is not limited to this, can select only value according to situation.

Figure 13 represents with the example under other device realization and the equal disposition of Figure 12.At first, record current time (T0) is waited for certain hour (T second) (S1302).Judge whether receive the confirmation signal (S1303) at the certain hour waiting time.When receiving the confirmation signal (being among the S1303), send ack signal (S1304).On the other hand, when not receiving the confirmation signal (among the S1303 not), record current time (T1) (S1305).Then, difference value and the predetermined setting of T1 and T0 compared (S1306), when difference value than setting hour ("No"), turn back to pending (S1302) such as certain hours.On the other hand, when difference value surpasses setting (being "Yes" among the S1306), then be judged as circle outer (S1307).

Above-mentioned handling procedure is the processing at the confirmation of receipt data side.Below, illustrate in the processing that receives the ack signal side.

As shown in figure 14, at first, counter is set to 0 (S1401), and waits for certain hour (T second) (S1402).Then, send confirmation signal (S1403).Then, judge whether receive ack signal (S1404).When receiving ack signal, (be "Yes" among the S1404), turn back to the processing of step S1401.On the other hand, when not receiving ack signal (among the S1404 not), make counter increase by 1 (S1405).Then, the value and the predetermined setting of counter compared (S1406), when count value than setting hour (denying), wait for that certain hour turns back to processing (S1402).On the other hand, when count value surpasses setting (being "Yes" among the S1406), then be judged as circle outer (S1407).

Figure 15 represents with the example under other program realization and the equal disposition of Figure 14.At first, record current time (T0) is waited for certain hour (T second) (S1502).Then, send confirmation signal (S1503).Then, judge whether receive ack signal (S1504).When receiving ack signal, (be "Yes" among the S1504), turn back to the processing of step S1501.On the other hand, (be not "No" among the S1504) when receiving ack signal, record current time (T1) (S1505).Then, difference value and the predetermined setting of T1 and T0 compared (S1506), when difference value than setting hour ("No"), wait for that certain hour turns back to processing (S1502).On the other hand, when difference value surpasses setting (being "Yes" among the S1506), then be judged as circle outer (S1507).

Like this, at Wireless AV system 1, transmitter and receiver detect the ack signal/confirmation signal from the other side respectively, when not beaming back ack signal/confirmation signal, are judged as outside the circle.

Below, use Figure 16, an example that communications status is categorized as the program of " well ", " deterioration ", " deterioration ", " enclosing outward " based on error rate etc. be described.And, to carry out although should detect the 2nd SS-CPU84 that handles by TV body 3, it also can be carried out by TV microcomputer 64.

At first, packet error rate and predetermined threshold value (first threshold) Th1 are compared (S1601).Packet error rate is the error rate that grouping comprised that receives.When packet error rate than threshold value Th1 hour (being "Yes" among the S1601), communications status is judged to be " well " (S1602).And threshold value Th1 for example can be set at 0.001.But, be not limited to this, can be according to the selected only value of situation.

Then, when packet error rate is bigger than threshold value Th1 (being "No" among the S1601), then will sends out number of times and predetermined threshold value (second threshold value) Th2 again and compare (S1603).Send out number of times again and be reparation in packet error rate height, grouping become can not the time, the number of times that divides into groups to resend.When sending out number of times again, communications status is judged to be " deterioration " (S1604) than threshold value Th2 hour (being among the S1603).Here, threshold value Th2 is preferably the not disorderly higher limit of video.In this case, the state of " deterioration " of communications status expression video disorder.And threshold value Th2 for example can be set at 3.But, be not limited to this, can be according to the selected only value of situation.

Whether connect and see, when sending number of times than threshold value Th2 hour (among the S1603 not), be the outer judgement (S1605) of circle.The outer judgement of circle can be carried out with Figure 12, program shown in Figure 13 as above-mentioned.Promptly, can be by monitoring at the appointed time whether receiver side can receive " confirmation signal " and " ack signal " carries out, confirmation signal is a wireless center 2 for confirming that communication counterpart is the signal that the existence of TV body 3 sends, and ack signal is to receive the confirmation the signal that the TV body 3 of signal is sent.Like this as result of determination,, then communications status is judged to be " deterioration " (S1606) if not circle outer (denying among the S1605).On the other hand, if outside the circle, then be with the communications status final decision " circle outward " (S1607).

And, at Figure 16,, also can judge communications status by only using packet error rate and it and secondary threshold value being compared although use packet error rate and send out number of times again and judge (S1601, S1603).Equally, also can judge communications status by only using to send out number of times again and it and 2 grades of threshold values are compared.And, be not limited to secondary, if compare, need not say that more detailed judgement becomes possibility with a lot of threshold value.Therefore, also can for example will use the secondary judgement of packet error rate and use the secondary of sending out number of times again to judge and make up.

Although the situation that detects the accepting state of electric wave by " error rate ", " based on error rate send out request number of times again " has been described, but in addition, for example " electric field strength ", " variation of error rate time ", " variation of electric field strength time ", " sending out the variation of request number of times time again " etc. can be as the parameter utilizations.Especially, at the battery saving mode that is used for suppressing power consumption, under the state that does not send receiver, video and/or voice data, preferably judge the electric wave state by electric field strength.

Below, use Figure 17 and Figure 18, illustrate that the transmission channel change is handled and the transmission channel change is judged.Have, these are handled in wireless center 2 and are carried out by a SS-CPU again, are carried out by the 2nd SS-CPU in TV body 3, but also can be carried out by wireless center microcomputer 37 and/or TV microcomputer 64 respectively.

As shown in figure 17, in transmitter (wireless center 2), at first, carry out the transmission channel change and judge (S1701).The transmission channel change judges that state is to be determined under the condition that waits continuously more than the certain hour outside circle.The result who judges when transmission channel change (being "Yes" among the S1701) when being, communications status becomes " just at channel searching ", carries out transmission channel and changes (S1702).

Here, as the employed channel of wireless transmission, suppose to have " transmission channel A ", " transmission channel B ", " transmission channel C " 3 transmission channels.The order of transmission channel change with transmission channel A → transmission channel B → transmission channel C → transmission channel A → ... and so on completeness change in proper order.For example, when present transmission channel is transmission channel B, mean that the processing by step S1702 is altered to transmission channel C.

Then, send confirmation signal (S1703).Then, judge whether to receive ack signal (S1704).When (being "Yes" the S1704) when receiver receives ack signal, be fixed on this transmission channel, carry out later communication.At this moment, communications status becomes " well " from " exploration transmission channel ".

On the other hand, if can not receive ack signal (being "No" the S1704), then transmission channel elapsed time and stipulated time TS is after changing compared (S1705) from receiver.When the elapsed time than stipulated time TS hour (being "No" among the S1705), then turn back to the processing (1703) that sends confirmation signal.On the other hand, when the elapsed time, TS was big than the stipulated time (being "Yes" among the S1705), then turn back to the processing (1702) of change transmission channel.

Below, the processing in the receiver (TV body 3) is illustrated equally.

At first, carry out the transmission channel change and judge (S1711).The result who judges when channel alteration (being "Yes" among the S1711) when being, communications status becomes " searching for transmission channel ", and transmission channel is changed (S1712).

Then, judge whether receive the confirmation signal (S1713) from transmitter.When (being "Yes" the S1713) when transmitter receives the confirmation signal, then be fixed on this channel, ack signal is sent to transmitter (S1714), and carry out later communication.At this moment, communications status becomes " well " from " searching for transmission channel ".

On the other hand, if do not have to receive the confirmation signal (being "No" the S1713), then transmission channel elapsed time and stipulated time TJ is after changing compared (S1715) from transmitter.When the elapsed time than stipulated time TJ hour (being "No" among the S1715), then turn back to the processing (1713) of judging that confirmation signal receives.On the other hand, when the elapsed time, TJ was big than the stipulated time (being "Yes" among the S1715), then turn back to the processing (S1712) of change transmission channel.

Here, bigger by the stipulated time TJ that makes receiver than the stipulated time TS of transmitter, even transmitter and receiver change the processing of transmission channel simultaneously, also can access chance with same channel communication.For example, change under the situation of three transmission channel A, B, C, wish hypothesis stipulated time TJ＞stipulated time TS * 3 in order.

Figure 18 is illustrated in to have three transmission channel A, B, the key diagram of an example of the sequential under the situation of C when transmitter and receiver change transmission channel simultaneously.As shown in the drawing, transmitter changes transmission channel A → transmission channel B → transmission channel C and transmission channel at each stipulated time TS, and receiver changes transmission channel C → transmission channel A → transmission channel B and transmission channel at each stipulated time TS.Here, stipulated time TJ＞stipulated time TS * 3.

When transmitter sent confirmation signal with transmission channel A, B, receiver was selected transmission channel C.Therefore, because the transmission channel difference does not apply confirmation signal at receiver.After this, when transmitter sent confirmation signal with transmission channel C, transmitter was still selected transmission channel C.Therefore, since the transmission channel unanimity, receiver confirmation of receipt signal, and to transmitter transmission ack signal.By this, transmitter is established with transmission channel C with receiver and is communicated by letter.

Have, the wireless center 2 of Wireless AV system 1 and TV body 3 can also communicate status detection and report based on video and/or voice data, also can carry out based on the control command that comprises the transmission channel modification information again.Even video and/or voice data are even control command (that is, " confirmation signal " of Figure 11, " ack signal " etc.) when reporting transmission state, is also used same message.When any one transmission state of video data, voice data, control command degenerates, show and report message.As the example of reporting message, when becoming bad, electric wave shows " outside the circle ", when the electric wave state deteriorating, show " electric wave is difficult to receive ", when souning out the transmitter that communicates by the change transmission channel, show " searching for transmitter ", when the transmitter of finding to communicate by letter, connect and show " in the connection " etc. when setting.

Here, for the change transmission channel, situation that the control command of with good grounds comprising " transmission channel modification information " changes and situation about changing as above-mentioned communications status (communication disruption) according to confirmation signal and ack signal.

The former is suitable with the situation that operation by the user is set to certain specific transmission channel.In this transmission channel modification information, comprise the information that is altered to which transmission channel.On the other hand, the latter is suitable with the situation that the setting that makes the user in advance for example becomes " automatically " and the idle transmission channel of exploration.

As described above, present embodiment Wireless AV system 1 is by constituting as the wireless center 2 of base station equipment with as the TV body 3 of wireless terminal, TV body 3 comprises: SS sends receiving element 61, its MPEG2 stream of being received of decoding again when the SS that receives wireless center 2 sends MPEG2 stream that receiving element 36 sent and instruction transmission data etc.; TV portion 63, its display video signal and output sound signal; TV microcomputer 64, it carries out the control of whole device; The 2nd SS-CPU84, it detects communications status between wireless center 2 and the TV body 3 by the request of sending out again based on the electric field strength of reception electric wave and error rate.TV microcomputer 64 is owing to interrupt video and voice data based on the communications status that is detected, transmission channel is in change, in connection and each message OSD that comprises the receiving sensitivity information outside the communication circle be presented in the TV portion 63, even therefore when switching transmission channel and because of electric wave, make out of order under the situation of communications status interruption, inform the suitable message of status transmission by demonstration, the user can know easily that video breaks still is a communication terminal change transmission channel, or electronics wave band use etc. causes communications status to worsen because of disturbing electric wave, can eliminate user's discomfort.For example, even display video not, owing to show message such as " in the connections " by OSD, therefore the user can be by understanding intuitively that reason that video is not shown waits by the time display video, can possibly prevent to be used to avoid the useless transmission channel of the state that image is not shown to operate.By avoiding the useless transmission channel operation of user, can shorten the time before video shows.

In the present embodiment, as at Fig. 7 (4) from described in the outer transition of circle, owing to the content that changes message according to communications status, so the user can know the passing of communications status definitely.These message are examples, can know the content of any kind of in any one step.For example, under the situation of the deterioration of estimating communications status or recovery,, know then easilier if indicate with the general time that shows until video and the characteristics of image (image character) of this time of expression.

When accepting state worsens, take action next time that (for example, " accepting state worsens pointer if make to broadcast to the user by demonstration/sound.Please move to the place that is easy to receive electric wave " or " the accepting state rapid deterioration please leave the barrier of electronics wave band etc. " etc.), warmer system then become.

In the present embodiment, be presented in the TV portion 63 by the message OSD that will inform status transmissions such as video and voice data, can know the message of status transmissions such as video and voice data, still, can report by the sound that uses the synthetic LSI of sound, perhaps also can report by combination.And, be not limited to OSD and show, can be the display packing of any kind.

In present embodiment, measure the time of communication disruption, owing to begin to have kept transmission channel in the past from this communication disruption, therefore can prevent to switch continually transmission channel, and can on whole network, keep only communications status to the setting-up time of regulation.

Have, Wireless AV system of the present invention is not limited to above-mentioned execution mode again, obviously, in the scope that does not break away from main points of the present invention, can obtain various changes.For example, although suppose that portable TV as wireless AV equipment, is not limited to the TV receiver, it can be applicable to the device with radio communication function or its fusion.For example, as AV equipment, except VTR (Video TapeRecorder: video tape recorder), can also be the record reproducing device that on HDD and DVD, writes down.As device that can transmitting and receiving data, can be with the computer be representative fusion the device of information equipment function, it can be applicable to whole systems.The content of transmitting and receiving data can be any content.

In the present embodiment, although be illustrated with the TV receiver, be not limited thereto, as described, this execution mode also can be applied to tuner and master computer and use in other AV equipment of tuner.

Constitute the kind of each handling part of above-mentioned Wireless AV system, the kind/form of set information etc. and be not limited to described execution mode.

As tuner, be example although 2 broadcasting of BS tuner and U/V tuner are enumerated, the kind and the number of broadcasting such as CS tuner are not limited to this.

In the present embodiment, although use the title of radio communication device and Wireless AV system and so on, this is for the convenience that illustrates, it also can be Wireless Telecom Equipment, AV equipment, broadcasting station channel selecting device etc.

In the present embodiment, although illustrated " device for informing " is arranged on formation on the receiver side (TV body 3), also can be arranged on the transmitter side (wireless center 2) by display panel and LED etc.That is, Wireless AV system of the present invention can be to make at the device for informing that receiver side is reported the reception situation to be installed in formation on any one of transmitter side or receiver side.But, wish that the detection of communications status is carried out in receiver side (TV body 3).

Above Shuo Ming Wireless AV system is even be used to make the program that constitutes this each apparatus functionization of Wireless AV system also can realize.This program is stored in the recording medium of embodied on computer readable.According to the present invention, as this recording medium, main storage itself can be a program medium, perhaps as external memory, can be provided with the program reading device pass through recording medium is inserted wherein and the program medium that can read.Even under any one situation, institute's program stored can be constituting of carrying out by the CPU access, perhaps can be under any one situation also read routine and the program of being read by being downloaded to the mode of carrying out this program in the not shown program storage area.The program that is used for downloading is stored in body apparatus in advance.

Here, the said procedure medium are to be constituted as the recording medium that can separate with body, and it can be that the cards such as dish system, IC-card/light-card of CDs such as disk such as bands systems such as tape and cassette tape, soft (login trade marks) dish and hard disk and CD-ROM/MO/MD/DVD are or comprise the medium that the semiconductor memory that is made of mask ROM, EPROM, EEPROM, flicker ROM etc. is also fixedly taken on program.

And although do not illustrate, when comprising the device that can be connected with external communication network, it can be fluidly but hold the medium of program, makes can download from communication network by getting involved this communication link.And when downloading from this communication network, the program that is used for downloading is stored in body apparatus in advance, perhaps can install from other recording medium.And as the content that recording medium is stored, it is not limited to program, also can be data.

And present embodiment does not limit the scope of the invention, can carry out various changes within the scope of the present invention.For example, can followingly constitute.

Radio communication device of the present invention also can comprise: communicator, the control command that it sends receiver, video and voice data or comprises the transmission channel modification information; The communications status checkout gear, it detects communications status; Device for informing, it reports the status transmission of described video and voice data at least based on the communications status that is detected by described communications status checkout gear.

And, the time that also can measure communication disruption, and from this communication disruption begin to through the regulation setting-up time till keep transmission channel.

Described communicator can be to transmit the device of described video and voice data or described control command by SS (diffusion spectrum) wireless mode.

Described communicator can be the device that transmits described video and voice data by the mpeg stream according to the MPEG2 coded system.

Described communicator can be a closely twocouese radio communication of small-power.

As preferred concrete form, described communicator is bluetooth, UWB or WLAN.

Described communications status checkout gear is preferably by the electric field strength that receives electric wave or error rate or based on the request number of times of sending out again of error rate and detects communications status.

Described communications status checkout gear is preferably the communications status of detection between the radio communication device of having established communication link.

Described device for informing can be interrupt at described video and voice data, in the transmission channel change, in being connected, comprise and report at least any one or above device in the middle of the receiving sensitivity information of communicating by letter outside enclosing.

Described device for informing can be the message pronunciation that shows or pass through voice output by the message of display unit.

Wireless AV system of the present invention is the Wireless AV system that connects a plurality of radio communication devices by wireless network, and described radio communication device can be described radio communication device.

As preferred concrete form, described radio communication device is by display unit and has the tuner that is used for broadcast reception and video and voice data are transferred to the television receiver that center fixture constituted on the described display unit.

Operation control program of the present invention is to be used for the program that computer is carried out control and treatment, they are in a plurality of radio communication devices that constitute wireless network, send receiver, video and voice data or comprise the control command of transmission channel modification information, detect communications status, and report the status transmission of described video and voice data based on the described communications status that detects at least.

The recording medium of minute book invention operation control program is that record is used for the medium that computer is carried out the program of control and treatment, this program is in a plurality of radio communication devices that constitute wireless network, send receiver, video and voice data or comprise the control command of transmission channel modification information, detect communications status, and report the status transmission of described video and voice data based on the described communications status that detects at least.

Wireless terminal of the present invention is constituted as and comprises: communicator is used for sending receiver, video and/or voice data with base station equipment or comprises the control command of transmission channel modification information; The communications status checkout gear is used to detect communications status; Device for informing, it reports receiving sensitivity information based on the communications status that is detected by described communications status checkout gear.

Wireless terminal of the present invention can be constituted as and comprise: communicator is used for sending receiver, video and/or voice data with base station equipment or comprises the control command of transmission channel modification information; The communications status checkout gear is used to detect communications status; Device for informing, it reports the status transmission of described video and/or voice data at least based on the communications status that is detected by described communications status checkout gear.

Wireless terminal of the present invention can comprise the transmission channel holding device, the time of this measurement device communication disruption, and begin to through keeping transmission channel till the official hour from this communication disruption.

Wireless terminal of the present invention, described communications status checkout gear can based on the electric field strength that receives electric wave, error rate, based on error rate send out request number of times again any one detect communications status.

Wireless terminal of the present invention, described communications status checkout gear can detect and establish the communications status between the base station equipment of communication link.

Wireless terminal of the present invention, described device for informing can interrupt, be in the transmission channel change, is in the connection, reports more than one of them in the middle of being in the receiving sensitivity information outside the communication circle comprising described video and/or voice data.

Wireless terminal of the present invention comprises communicator, it is used for the control command that sends receiver, video and/or voice data or comprise the transmission channel modification information with base station equipment, simultaneously, described communicator is the device that receives the information that is illustrated in the communications status that is detected in the described base station equipment from base station equipment, and it comprises the device for informing of reporting receiving sensitivity information based on the information of the described communications status of expression of described communicator reception.

Wireless terminal of the present invention, described device for informing can be the message pronunciations that shows or pass through voice output by the message of display unit.

Wireless terminal of the present invention can comprise communicator, it is used for the control command that sends receiver, video and/or voice data or comprise the transmission channel modification information with base station equipment, comprise the transmission channel holding device simultaneously, it is measured the time of communication disruption and is beginning from this communication disruption to keeping transmission channel through till the official hour.

Wireless terminal of the present invention, its described communicator can be to transmit described video and/or voice data or described control command by the spread spectrum radio mode.

Wireless terminal of the present invention, described communicator can be WLAN or bluetooth and UWB (Ultra Wide Band: ultra broadband) wait and carry out closely twocouese radio communication of small-power.

Wireless terminal of the present invention, described communicator can be the devices that transmits described video and/or voice data by the mpeg stream according to the MPEG2 coded system.

Wireless terminal of the present invention can comprise display unit at least, and it comes display video signal based on the video data that is received, and/or shows the information of the base station equipment of having established communication link based on the control command that is received.

Base station equipment of the present invention can be the equipment that sends receiver, video and/or voice data with described wireless terminal or comprise the control command of transmission channel modification information.

Base station equipment of the present invention can be to comprise the communications status checkout gear that detects communications status, and will represent that the information of the communications status that detected by described communications status checkout gear sends to the equipment of above-mentioned wireless terminal.

Base station equipment of the present invention, the video of its input and/or voice data can be the data from the outside.

Base station equipment of the present invention, the video of its input and/or voice data can be the data from the tuner that is used for broadcast reception.

Wireless system of the present invention can be to comprise described wireless terminal and send receiver, video and/or voice data with described wireless terminal or comprise the structure of base station equipment of the control command of transmission channel modification information.

The control method of wireless terminal of the present invention is the control method that constitutes the wireless terminal make the wireless system that wireless terminal and base station equipment be connected by wireless network, is to send receiver, video and/or voice data with base station equipment or comprise control command, the detection communications status of transmission channel modification information and the method for reporting receiving sensitivity information based on the described communications status that detects.

The control method of wireless terminal of the present invention is the control method that constitutes the wireless terminal make the wireless system that wireless terminal and base station equipment be connected by wireless network, is to send receiver, video and/or voice data with base station equipment or comprise control command, the detection communications status of transmission channel modification information and the method for reporting the status transmission of described video and/or voice data based on the described communications status that detects at least.

The control method of wireless terminal of the present invention is the control method that constitutes the wireless terminal make the wireless system that wireless terminal and base station equipment be connected by wireless network, be send receiver, video and/or voice data with base station equipment or comprise the control command of transmission channel modification information, by receive information that is illustrated in the communications status that is detected the described base station equipment and the method for reporting receiving sensitivity information based on the information of representing this communications status from base station equipment.

The control method of wireless terminal of the present invention is the control method that constitutes the wireless terminal make the wireless system that wireless terminal and base station equipment be connected by wireless network, be send receiver, video and/or voice data with base station equipment or comprise the transmission channel modification information control command, measure communication disruption time and begin from this communication disruption to the stipulated time in the past till the method for maintenance transmission channel.

The control program of wireless terminal of the present invention is the control program that makes described wireless terminal action, can be to make the functional programs of computer as above-mentioned each device.

The recording medium of embodied on computer readable of the present invention is the medium of the described wireless terminal control program of record.

Can be constituted as according to wireless terminal of the present invention and to comprise: communicator is used for sending receiver, video and/or voice data with base station equipment or comprises the control command of transmission channel modification information; The communications status checkout gear is used to detect communications status; Device for informing, it reports the status transmission of described control command at least based on the communications status that is detected by described communications status checkout gear.

According to the control method of wireless terminal of the present invention is the control method that constitutes the wireless terminal that makes the wireless system that wireless terminal and base station equipment be connected by wireless network, is to send receiver, video and/or voice data with base station equipment or comprise control command, the detection communications status of transmission channel modification information and the method for reporting the status transmission of described control command based on the described communications status that detects at least.

According to above-mentioned formation, can report status transmission by the control command of wireless terminal and reception that base station equipment sends.As this control command, can utilize base station equipment for example for confirming that communication counterpart is existence of wireless terminal " confirmation signal " that send and " ack signal " that wireless terminal sent that receives the confirmation signal etc.Wireless terminal shows when the transmission state of control command degenerates to be reported message and reports the user.As reporting message, for example, in the time that electric wave can not be received, show " outside the circle ", when the electric wave state deteriorating, show " electric wave is difficult to receive ", when souning out the transmitter of communication by the change transmission channel, show " searching for transmitter ", when finding the transmitter of communicating by letter and connecting setting, demonstration " in the connection " etc.

Therefore, according to above-mentioned wireless terminal,, can improve the convenience that the user uses even under the situation that the demonstration that makes video by transmission channel change etc. is interrupted, also can make the user not produce discomfort.

According to wireless terminal of the present invention, can also comprise the transmission channel holding device, it is measured the time of communication disruption and is beginning to keep transmission channel to official hour in the past from this communication disruption.

According to above-mentioned formation, can prevent the frequent switching of transmission channel and on whole network, keep only communications status as far as possible.

According to wireless terminal of the present invention, can for its described communications status checkout gear based on the electric field strength that receives electric wave, error rate, based on error rate send out request number of times again any one detect communications status.

According to above-mentioned wireless terminal,, can preferably use the electric field strength that receives electric wave, error rate, send out request number of times again based on error rate as the parameter that detects communications status.By making up multiple parameter, also can more effectively detect communications status.

According to wireless terminal of the present invention, can detect and establish communications status between the base station equipment of communication link for its described communications status checkout gear.

According to above-mentioned formation, can detect and establish the communications status between the base station equipment of communication link.

According to wireless terminal of the present invention, can for described device for informing comprise described video and/or voice data interrupt, for the transmission channel change in, report any one or above terminal in the middle of for the receiving sensitivity information outside enclosing in connecting, for communication.

According to above-mentioned formation, can report comprise described video and/or voice data interrupt, for the transmission channel change in, in the middle of the receiving sensitivity information outside enclosing in connecting, for communication any one or more than.

According to wireless terminal of the present invention, can carry out the message demonstration or carry out the message pronunciation by display unit for described device for informing by voice output.

According to above-mentioned formation, show or the message pronunciation by message, can give the user with the information indicating of representing the various contents of communications status suitably.

According to wireless terminal of the present invention, in change during transmission channel, make cycle or wireless terminal more than time of whole transmission channel circulation primary keep making any one sequential in the cycle of whole transmission channel circulation primary switch transmission channel during a transmission channel with base station equipment.

According to above-mentioned formation,,, therefore can establish communication by the change transmission channel owing to can find inevitable consistent transmission channel when for wireless terminal and base station equipment change under the situation of transmission channel simultaneously.

According to wireless terminal of the present invention, can transmit described video and/or voice data or described control command by the spread spectrum radio mode for described communicator.

Above-mentioned wireless terminal is suitable for the radio communication device of spread spectrum radio mode.

According to wireless terminal of the present invention, the small-power that can carry out WLAN or bluetooth and UWB (ultra broadband) etc. for described communicator is the twocouese radio communication closely.

The small-power that above-mentioned wireless terminal is suitable for carrying out WLAN or bluetooth and UWB (ultra broadband) etc. is the radio communication device of twocouese radio communication closely.

According to wireless terminal of the present invention, can transmit described video and/or voice data by mpeg stream for described communicator according to the MPEG2 coded system.

Above-mentioned wireless terminal is suitable for transmitting by the mpeg stream according to the MPEG2 coded system radio communication device of described video and/or voice data.

And wireless terminal of the present invention can also comprise the display unit of coming display video signal based on the video data that is received.

Above-mentioned wireless terminal also is suitable for the wireless TV receiver that comprises display unit, come for example displays separated type of display video signal based on institute's receiving video data.

And whether wireless terminal of the present invention can disorderly for the shown video of described communications status checkout gear judging/displaying device.

According to said structure, after the situation that has detected the video disorder shown, warning can be reported the user by display unit.

In addition, base station equipment of the present invention can be for sending receiver, video and/or voice data with described wireless terminal or comprising the control command of transmission channel modification information.

According to above-mentioned formation, can realize sending receiver, video and/or voice data or comprise the base station equipment of the control command of transmission channel modification information with described wireless terminal.

According to base station equipment of the present invention, can be for comprising the communications status checkout gear that detects communications status, and will represent that the information of the communications status that detected by described communications status checkout gear sends to above-mentioned wireless terminal.

According to above-mentioned formation, the information of expression communications status can be sent to wireless terminal.Therefore, wireless terminal can be based on being come to user's information telling communication state by the communications status that base station equipment detected.

According to base station equipment of the present invention, in change during transmission channel, make cycle or wireless terminal more than time of whole transmission channel circulation primary keep making any one sequential in the cycle of whole transmission channel circulation primary switch transmission channel during a transmission channel with wireless terminal.

According to above-mentioned formation,,, therefore can establish communication by the change transmission channel owing to can find inevitable consistent transmission channel when for wireless terminal and base station equipment change under the situation of transmission channel simultaneously.

According to base station equipment of the present invention, the video of its input and/or voice data can be the data from the tuner that is used for broadcast reception.

Video that above-mentioned base station equipment will be imported from the tuner that is used for broadcast reception and/or data transmission in network telephony are suitable for for example center fixture of the wireless AV receiver of displays separated type to wireless terminal.

Can comprise described wireless terminal and send receiver, video and/or voice data with described wireless terminal or comprise the base station equipment of the control command of transmission channel modification information according to wireless system of the present invention.

According to above-mentioned formation, can report status transmission by the control command of wireless terminal and reception that base station equipment sends.Therefore, according to above-mentioned wireless terminal,, can improve the convenience that the user uses even when video being shown interrupt, also can make the user not produce discomfort.

And, above-mentioned wireless terminal can be by computer realization, in this case, computer-readable medium storing also is included into scope of the present invention, it has write down the control program of wireless terminal, and this control program realizes above-mentioned wireless terminal by making computer as above-mentioned each device action in computer.

Constitute embodiment or embodiment in the detailed description of the invention and just make the technology of the present invention content more clear, can not with its narrow sense be interpreted as only being defined in such object lesson.In the scope of spirit of the present invention and claim, can also carry out various changes.

Utilizability on the industry

Wireless system wireless transmission video of the present invention and/or voice data are although it is suitable for for example showing Show AV network system in the such family of the wireless TV receiver of device divergence type, but be not limited to This, it also can be widely used in portable telephone/PHS (personal handyphone system) (login Trade mark) and the Wireless Telecom Equipment such as portable information terminal (PDA (personal digital assistant)).

Claims (20)

1. a wireless terminal is characterized in that, comprising:

Communicator, the transmission of carrying out video and/or voice data with base station equipment or having comprised the control command of transmission channel modification information receives;

The communications status checkout gear detects communications status; And

Device for informing based on the communications status that described communications status checkout gear detects, is reported the status transmission of described control command at least.

2. wireless terminal according to claim 1 is characterized in that comprising: the transmission channel holding device, and the time of this measurement device communication disruption, and till the process official hour, keeping transmission channel from this communication disruption.

3. according to claim 1 or 2 described wireless terminals, it is characterized in that: described communications status checkout gear according to the electric field strength that receives electric wave, error rate, based on error rate send out again request number of times wherein at least one detects communications status.

4. according to any one described wireless terminal of claim 1 to 3, it is characterized in that: described communications status checkout gear detects and has established the communications status of the base station equipment of communication link.

5. according to any one described wireless terminal of claim 1 to 4, it is characterized in that: interrupt, be in the transmission channel change, be in the connection, be in the receiving sensitivity information outside the communication circle comprising described video and/or voice data, described device for informing is reported at least one of them.

6. according to any one described wireless terminal of claim 1 to 5, it is characterized in that: described device for informing carries out the message demonstration or carries out the message pronunciation by voice output by display unit.

7. according to any one described wireless terminal of claim 1 to 6, it is characterized in that: when the change transmission channel, with make more than or equal to base station equipment whole transmission channel circulation primary during cycle or wireless terminal cycle of keeping making during the transmission channel whole transmission channel circulation primary one of them regularly, switch transmission channel.

8. according to any one described wireless terminal of claim 1 to 7, it is characterized in that: described communicator transmits described video and/or voice data or described control command by the wireless frequency expansion mode.

9. according to any one described wireless terminal of claim 1 to 8, it is characterized in that: described communicator carries out closely twocouese radio communication of WLAN or bluetooth and UWB small-powers such as (ultra broadbands).

10. according to any one described wireless terminal of claim 1 to 9, it is characterized in that: described communicator transmits described video and/or voice data by meeting the mpeg stream of MPEG2 coded system.

11. according to any one described wireless terminal of claim 1 to 10, it is characterized in that: comprise display unit, this device comes display video signal based on the video data that receives.

12., it is characterized in that: the whether multilated of the shown video of described communications status checkout gear judging/displaying device according to any one described wireless terminal of claim 1 to 11.

13. a base station equipment is characterized in that, described base station equipment can receive with the transmission of carrying out video and/or voice data according to any one described wireless terminal of claim 1 to 12 or comprising the control command of transmission channel modification information.

14. base station equipment according to claim 13 is characterized in that:

Comprise the communications status checkout gear that is used to detect communications status,

The information of the communications status that expression is detected by described communications status checkout gear sends to described wireless terminal.

15. base station equipment according to claim 13 or 14, it is characterized in that: when the change transmission channel, with make more than or equal to wireless terminal whole transmission channel circulation primary during cycle or the one in wireless terminal cycle of keeping making during the transmission channel whole transmission channel circulation primary regularly, the switching transmission channel.

16. according to any one described base station equipment of claim 13 to 15, it is characterized in that: the video of input and/or voice data are the data from the broadcast reception tuner.

17. a wireless system is characterized in that comprising:

The wireless terminal of claim 1 record; And

Carry out video and/or voice data with described wireless terminal or comprise the base station equipment that the transmission of the control command of transmission channel modification information receives.

18. the control method of a wireless terminal is used for wireless terminal and base station equipment by the wireless system that wireless network is connected, and it is characterized in that:

The transmission of carrying out video and/or voice data with base station equipment or comprising the control command of transmission channel modification information receives,

Detect communications status,

Based on the described communications status that detects, report the status transmission of described control command at least.

19. the control program of a wireless terminal makes the wireless terminal action of claim 1 record, is used to make computer to have function as above-mentioned each device.

20. a computer-readable medium storing has write down the control program of the wireless terminal of claim 19 record.

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