CN1875561A - Device and method for receiving broadcast wave in which a plurality of services are multiplexed - Google Patents

Abstract

There is provided a communication for transmitting a first stream (intermittent data section) for burst-transmitting a packet set and a second stream (continuous data section) for transmitting a packet at a speed based on the transmission speed required for service. Upon selection of a service, a second stream for the selected service is received and reproduced until the intermittent data transmitted in the first stream is received. When transmission of the intermittent data on the selected service is started in the first stream, reception and reproduction of the first stream are started.

Description

The receiving system and the method for reseptance of the broadcasting wave of multiplexed a plurality of services

Technical field

The reception technique of the broadcasting wave that the present invention relates to a plurality of services multiplexed relates in particular to towards the method for reseptance and the receiving system of the numerical data broadcasting of portable terminal device.

Background technology

The load mode of the ground-wave digital broadcasting in Europe is carried out standardization with ETSI.(with reference to DVB-T EN300 477).But, owing to can not support the part of the segmentation as standard (for example ARIBSTD-B31) in Japan to receive, so under the situation of the broadcasting that receives the DVB-T mode by portable terminal device, identical with the fixed terminal of STB etc., need to receive all signals, exist in the conditional portable terminal device of power supply capacity and to consume a lot of power, the cyclic regeneration time problem on the practicality such as shorten.

Therefore, in document EP 1337071A2, as shown in figure 20, bag (packet) with same service, concentrate and be bag collection (packet set), and each bag collection transmitted in the short time at high speed as data set (date burst) 10, order transmits bag collection of each service, makes undope in the transmission bag collection of other services of a bag service (packet service).

In the receiver,, carry out the power supply of acceptance division and supply with, thereby realize low consumpting power (below be called " timeslice (time slice) mode ") by only during the bag collection of the service of transmit wishing sends.

But, in this timeslice mode, have following problem: during channel selection after receiver carries out power connection or when the channel channel selection of other services, during several seconds before the bag collection of this service of transmission, can not begin content regeneration.

Patent documentation 1:EP1337071A2 communique

As mentioned above, in the timeslice mode, because the block transfer data so when channel selection, have following problems, had promptly produced the stand-by period before the regeneration of service begins, converted channel (zapping) audiovisual can not be carried out smoothly.

Summary of the invention

The present invention is the invention that solves above-mentioned prior art problems, and its objective is provides a kind of by the time of reception sheet shortens to the stand-by period that begins to regenerate with flowing selectively with converted channel.

Receiving system of the present invention is the receiving system that the broadcasting wave that multiplexed a plurality of services back sends is received.Broadcasting wave comprise block transfer be used for each service of conveyance content bag collection first-class and sends second of the bag that is used for the content that conveyance respectively serves with speed continuously and flows based on the required transfer rate of service.Receiving system has the operating unit of the operation that the user stipulates; Receive the receiving element of broadcasting wave; With the regeneration unit of regenerating after the data that received of decoding.Select a service on the operating unit, to receive till the first burst data relevant with this selected service during, the converted channel pattern is set is used as pattern, when the transmission of the beginning first burst data relevant, enter into intermittently receiving mode from the converted channel pattern with selected service.In the converted channel pattern, receiving element receives the data of the service of selecting in second stream, the regenerate data of second stream of this reception of regeneration unit.In the intermittence receiving mode, receiving element receives the data of the service of selecting in first-class, the regenerate first data of this reception of regeneration unit.

Second stream is also to comprise the data identical with first-class content, but amount of information is lacked than first data.In addition, second stream also can be based on the associated data of first content, and the data volume of second stream is lacked than first data volume.For example, second stream stream to generate than the big compression ratio of compression ratio that generates when first-class.

Receiving system also can further have the buffer of the first data that temporary transient storage is received for regeneration.At this moment, from intermittence receiving mode when the converted channel pattern enters, selected different services by the user in the converted channel pattern till, be preferably in the burst data of the service that receives in the receiving mode intermittence before keeping in the buffer being about to enter.

In addition, receiving system also can further have the buffer of the first data that temporary transient storage is received for regeneration.At this moment, during the converted channel pattern in, receiving element is preferably receiving the data of all services in first-class with the irrelevant mode of selected service, and uses the first data that received to upgrade buffer all the time.

In addition, receiving system also can have the buffer of the first data that temporary transient storage is received for regeneration.The kind of the button of the operation when at this moment, preferably basis is used to serve switching in the converted channel pattern makes the control difference of buffer.

In the receiving system, also can constitute in the following manner, promptly on operating unit, when the predetermined operation of the meaning of the selection decision of the audiovisual service that exists the user to carry out, the regeneration of the first-class data of beginning in the intermittence receiving mode.

Receiving system also can further have the demodulating unit of demodulated received signal.At this moment, in received signal, comprise under the situation of information of duration of burst data of first each service of expression, be preferably in from the reception of the burst data of selected service and begin, stop to supply with to the power supply of demodulating unit through after the duration.

Burst data constitutes by a plurality of sections, in each section, comprise under the situation of the temporal information till beginning to begin from the Data Receiving of this section to the reception of next burst data relevant with same service, also can be according to the temporal information that comprises in each section, to same service, to proofreading and correct from the burst data before receiving to the time that receives till next burst data.

In addition, in the receiving system,, also can obtain the poor of the first regeneration time information and the second regeneration time information that flows for same service, and poor according to this, proofread and correct first regeneration constantly.

Also can be, first-class voice data and the motion image data of comprising, second stream comprise in rest image and the voice data at least any.

Also can the burst data in first-class come conveyance second stream.

Receiving system also can further have the buffer of the data of second stream that temporary transient storage is received for regeneration.At this moment, be preferably in the burst data that do not receive selected service during in, receive the converted channel data of other services, scheduled store is in buffer, in the converted channel pattern, selected other whens service, regenerated after reading out in the data of other services of storing in the memory.

Represent that first-class related information with second stream also can be included among the PMT (Program Map Table) of PSI (Program Specific Information) of first-class conveyance.

Method of reseptance of the present invention is the method for reseptance that the broadcasting wave that multiplexed a plurality of services back sends is received.Broadcasting wave comprise each service of block transfer conveyance content bag collection first-class and sends second of the bag that is used for the content that conveyance respectively serves with speed continuously and flows based on the required transfer rate of service.In this method of reseptance, selecting a service, to receive till the first burst data relevant with this selected service during, the converted channel pattern is set is used as pattern, when the transmission of the beginning first burst data relevant, enter into intermittently receiving mode from the converted channel pattern, in the converted channel pattern with selected service, receive the data of the described service of selecting in second stream, and the data of second stream of this reception of regenerating; In the intermittence receiving mode, receive the data of the service of selecting in first-class, and the first data of this reception of regenerating.

The effect of invention

According to the present invention, after receiving, the broadcasting wave that multiplexed high-quality burst data (first-class) and low-quality continuous data (second stream) back are transmitted regenerates.At this moment, first-class by intermittently receiving when the common audiovisual, can suppress consumed power, by the continuous data (second stream) that regeneration when the converted channel audiovisual can receive all the time, the stand-by period in the time of can shortening channel selection.Further,, in converted channel, also can intermittently receive, can suppress consumed power by making low quality data (second stream) for easy little data such as rest image, sound.

Description of drawings

Fig. 1 is the figure of expression the present invention as the notion of the content load mode of prerequisite;

Fig. 2 is the figure of the data configuration image on the transmission channel of representing among the present invention;

Fig. 3 is the figure of the power supply control action of expression receiver of the present invention;

Fig. 4 is the figure of the method for reseptance of the converted channel of explanation receiver of the present invention when receiving;

Fig. 5 is the block diagram of the receiver of embodiments of the present invention 1;

Fig. 6 A is that the preceding of flow chart of the action of expression receiver of the present invention partly schemed;

Fig. 6 B is the later half figure of flow chart of the action of expression receiver of the present invention;

Fig. 7 A is the flow chart (converted channel action basic procedure) of action of receiver of the variation 1 of expression embodiments of the present invention 1;

Fig. 7 B is the flow chart (low quality data processing) of action of receiver of the variation 1 of expression embodiments of the present invention 1;

Fig. 7 C is the flow chart (buffer memory control) of action of receiver of the variation 1 of expression embodiments of the present invention 1;

Fig. 8 is the flow chart (expression buffer memory control) of action of receiver of the variation 2 of expression embodiments of the present invention 1;

Fig. 9 is the flow chart that the audiovisual service decision of receiver of the variation 3 of embodiments of the present invention 1 is handled;

Figure 10 A is the flow chart (converted channel action basic procedure) of action of receiver of the variation 4 of expression embodiments of the present invention 1;

Figure 10 B is the flow chart (low quality processing) of action of receiver of the variation 4 of expression embodiments of the present invention 1;

Figure 11 is the figure that the width of explanation burst data (burst date) is used;

Figure 12 is the figure of the correction usefulness of explanation Δ t;

Figure 13 is the figure of the generation method of the signal that receives of the receiver of the variation 7 of expression embodiments of the present invention 1;

Figure 14 is the block diagram of the receiver of embodiments of the present invention 2;

Figure 15 is the figure of the notion of the signal that receives of the receiver of the variation 2 of expression embodiments of the present invention 2;

Figure 16 is the figure of notion of the sending method of expression embodiments of the present invention 3;

Figure 17 is the figure of data configuration image on the transmission channel in the sending method of expression embodiments of the present invention 3;

Figure 18 is the figure of the method for reseptance of the converted channel of the explanation receiver that receives the sending method in the embodiments of the present invention 3 when receiving;

Figure 19 is the block diagram of the receiver of embodiments of the present invention 4;

Figure 20 is the schematic diagram of existing load mode;

Figure 21 is that expression is from the figure of IP bag to the conversion of TS bag;

Figure 22 is the figure of expression by the multiplexed situation of multiplexer.

Among the figure:

1-front end (head end); The content source of 2～6-service S1～S5; The 7-IP bag; 8-processing unit 1; 9-processing unit 2; The 10-burst data; The transport stream of low quality data that 11-is multiplexed; 11s1～11s5-low quality data group; The 12-TS multiplex machine; The 13-dispensing device; The 14-transfer channel; 15-converted channel group (zapping burst); 16-timestamp side-play amount test section; The 20-receiver; 21-user interface (UI); 22-receives control part; The 23-power control part; The 24-OFDM demodulation section; The 25-TS decoder; 26-IP wraps extraction unit; The 27-buffer; The 28-MPEG4 decoder; 29-pattern display part; 30-rest image obtaining section; 31-rest image buffer; 32-switch (SW); The 33-communication line; 34-converted channel buffer.

Embodiment

Below, the execution mode of receiving system of the present invention and method of reseptance is described with reference to the accompanying drawings.

For the execution mode of broadcasting receiver of the present invention is described, at first explanation sends the load mode of signal.Afterwards, for the action of receiver is described, the situation of lifting the converted channel audiovisual is an example, describes with reference to the accompanying drawings.In the following description, so-called " block transfer " be meant and transmit content simultaneously in the short time, afterwards, during soon, the transmission that stops to send.In addition, the processing of each following execution mode all can realize by software.

(content load mode)

At first, the content load mode that transmits as intermittence of prerequisite and continuous mixing of simple declaration the present invention.What is called " indexing transfer " is meant in the following description, the compression of Tin (for example 5 seconds) high-quality comprises the signal of vision signal and/or voice signal during the demonstration (presentation) of regulation, and the mode that transmits in the time of the 1/N of Tin (N is positive integer, for example N=36).At this moment, can timesharing among the Tin during showing send maximum 36 different services (for example service of 36 channels of TV), every during Tin send new motion image signal.Here, will be called service from the program that certain channel or supplier send here.If pay close attention to certain specific service (for example program of channel 1) and since every during Tin send motion image signal, so be called indexing transfer.On the other hand, the so-called transmission continuously is meant that during shorter than an image duration (for example (1/30) second) Tcon (about 23ms) transmits the mode of the signal after low quality is compressed.

The present invention relates to by the bag (first-class) of indexing transfer and the bag (second stream) that transmits are continuously mixed is a mode that stream sends.If only be indexing transfer, though can see high quality graphic, about 5 seconds stand-by period of needs during each handed over service.Indexing transfer is not suitable for: handed over service is sought the action of wanting the service seen one by one,, carries out the situation of converted channel that is.On the other hand, if only be continuous transmission, even then handed over service can not have the stand-by period yet and sees the video of the service that will switch at once.Among the present invention, owing to make indexing transfer and transmit continuously and mix, so, simultaneously,, also can watch this service with high-quality image if find the service seen wanted even carry out the service that converted channel can not have stand-by period ground receiver, video etc. yet.

For the execution mode that content transmits, the situation of lifting the converted channel audiovisual is an example, describes with reference to the accompanying drawings.Fig. 1 is the figure of generation method of the transmission signal of the broadcasting station that receives from receiving system of the present invention of explanation.

The 1st, digital broadcasting front end (head end), the 2,3,4,5, the 6th, the content source of service S1, S2, S3, S4, S5.With each content encoding is high-quality and two kinds of quality of low quality, generates high-quality IP (Internet protocol) bag 7 and low-quality IP bag 7b.Each content source comprises the high-quality that generates IP bag 7 with encoder with generate the low quality encoder of IP bag 7b, by respectively independently real-time encoder constitute.High-quality has the internal clocking CLa that represents the real time with encoder, and on the other hand, low quality also has the internal clocking CLb that represents the real time with encoder.Certainly the moment of internal clocking CLa is consistent with the moment of internal clocking CLb.

Give same content source with same IP address assignment, for example, from each IP bag 7 of content source 2.If the content source difference, i.e. service is different, and then the IP address is also different.In addition, in high-quality IP bag 7 and low-quality IP bag 7b, can use identical IP address, also can use different IP addresses from same content source.

In addition, high-quality can come the MPEG4 compression to comprise the content of vision signal and/or voice signal with average transfer rate 350kbps with encoder.Low quality can come MPEG4 to compress same content with average transfer rate 64kbps with encoder.

Under the transmission band of the broadcasting wave of reality was situation about about 15Mbps, (=350+64) kpbs then can transmit the individual service of 36 (≈ 15000 ÷ 414) if service needs 414.Above-mentioned transfer rate and MPEG4 boil down to one example also can be used other load mode and compress mode.

The parameter of transfer rate etc. is not limited to so above-mentioned.In addition, compression method also can be the method for WindowsMedia mode and Quick Time mode, JPEG2000 mode etc.

Use Figure 21, quality data at first is described.To generate as RTP (RTP) data with moving image and the voice data that average transfer rate 350kbps carries out after MPEG4 compresses, and add RTP head (header).On the RTP head, be added on the transmission reception period and obtain used time stamp T a synchronously.RTP data and RTP head are contained in the RTP bag.The RTP bag generates as UDP (User Datagram Protoco (UDP)) data, and adds the UDP head.UDP message and UDP head are contained in the UDP bag.The UDP bag is generated as the IP data, and add the IP head.IP data and IP head are received in the IP bag 7.

IP bag 7 behind such high-quality coding is input in the processing unit shown in Figure 18.Processing unit 8 has the number corresponding cache device with the content source number.In the example of Fig. 1, have 5 buffer B1, B2, B3, B4, B5, each buffer can be stored the IP bag (for example 1163 IP bags) of Tin (for example 5 seconds) during the demonstration that is equivalent to stipulate.Owing to the IP bag is carried out the MPEG compression, so be not 5 seconds actual memory time, but about (5/36) second.

At first, if the IP bag 7 of the service S1 of Tin during being equivalent to from buffer B1 storage is then delivered to the IP bag of being stored among the handling part PP1 successively.In handling part PP1, as shown in figure 21, IP bag 7 is converted to DSM-CC (digital storage media order and control) section, and further is converted to TS (transport stream) bag.The TS bag is made of certain-length (for example 188 bytes).Front end comprises the TS head in each TS bag.On the TS head, add the bag ID that the kind of TS bag is determined, i.e. PID.For example, the PID that comprises the TS bag of serving S1 adds " PID1 ".

In addition, add same PID in the TS of the data that comprise same service bag, make that the PID that comprises the TS bag of serving S2 is " PID2 ", the PID that comprises the TS bag of serving S3 is " PID3 ".Be documented in the following standard from of the conversion of IP bag, for example among ISO/IEC 13818-1, ISO/IEC 13818-6, the ETSI/DVB EN301192 to the TS bag.

A plurality of TS bags (bag collection) of " PID1 " have been added in output successively.The about 5 seconds TS bag group 10 who sends like this is called " cohort (burst) ".Among Fig. 1, the piece S1 that exports from processing unit 8 represents cohort, comprises the TS bag of the service S1 suitable with about 5 seconds demonstration continuously.

Then, behind the IP bag 7 of the service S2 of Tin, the IP bag of being stored is delivered among the handling part PP1 during storage is equivalent in buffer B2, be converted to the TS bag from the IP bag, simultaneously, each the TS bag after the conversion is added PID2 be used as wrapping ID at this.A plurality of TS bags of " PID2 " have been added in output successively.Represent cohort from the piece S2 of processing unit 8 outputs, comprise the TS bag of the service S2 suitable continuously with about 5 seconds demonstration.

Below, same, by each cohort, the TS bag of difference service is delivered in the multiplexer 12.

Then, low quality data is described.Identical with quality data, with order shown in Figure 21,, generate IP bag 7b by with moving image and voice data after the average transfer rate 64kbpsMPEG4 compression.Therefore, RTP bag is contained among the IP bag 7b in also, and comprises and send reception period and be used to obtain synchronous time stamp T b.

IP bag 7b behind the low quality coding is input to processing unit shown in Figure 19.Processing unit 9 has a buffer Bz, and the IP that stores from all content source with the order of sending here wraps 7b.If have the situation of wrapping all or part of coincidence of 7b from the IP of different content source, then also can have a plurality of buffers in the same manner with processing unit 8.Wherein, the capacity of buffer also can be the capacity that can store an IP bag 7b.The IP bag 7b that sends here is delivered to handling part PP2, and identical with handling part PP1, be converted to the TS bag from the IP bag.TS after conversion bag is irrespectively all added identical PID, for example " PIDX " with service." PIDX " is the unique PID that is expressed as the TS bag that converted channel uses.To deliver in the multiplexer 12 from the TS bag of handling device 9.Further connect PSI maker 18 on the multiplexer 12.

In addition, here, establish the TS bag that transmits low quality data and irrespectively all add identical PID with service, PIDX for example, but even identical with the transmission of quality data, the different PID of each service interpolation transmits, and also can not damage effect of the present invention.

In addition, the form of low quality data is not limited to comprise the form of moving image and sound, also can be the form of any or these combination in moving image, rest image, sound, the Word message.

In addition, also can dynamically determine the form of low quality data according to the condition of cohort number of serving simultaneously and average transfer rate etc.

PSI maker 18 generates PSI (program specific information).Comprise PAT (program association table), PMT (program map table), CAT (conditionalaccess table) and NIT (network information table) among the PSI.Each form wraps by one or more TS and holds after cutting apart.In the present embodiment since conditional access function and the present invention it doesn't matter, so the omission explanation relevant with CAT.The back illustrates the data structure of these forms.At first, multiplexer 12 is described.

As shown in figure 22, multiplexer 12 receives high-quality TS bag from processing unit 8, from the low-quality TS bag of processing unit 9, from three kinds of inputs of TS bag of the PSI of PSI maker 18, and these are enrolled in the stream.In addition,, all services are provided with a form, but for PMT, each service is provided with different forms for each PAT, NIT.In above-mentioned standard, stipulated to insert the position of PAT, PMT, NIT.Though disperse to insert low-quality TS bag, the time difference Tz1 of a low-quality TS bag S1 and next low-quality TS bag S2 is about 0.65msec.In addition, the time difference Tz2 of the low-quality TS bag of next of a low-quality TS bag S1 and same service S1 is about 23.5msec.In addition, if the transfer rate difference, this time difference Tz1, Tz2 change.Stream after multiplexed passes to transmitter 13 as transfer channel 14, and is sent by transfer path through transmitter 13.

Then, data structure is described.

At first, the bag ID (PID) that comprises in the head of TS bag determines as follows according to the kind of its data that comprise.

The TS bag of quality data: the PID (also comprising the high-quality code of expression) that comprises the different code of each service

The TS bag of low quality data: identical PID, and have nothing to do with service (also can comprise the low-quality code of expression)

The TS bag of PAT: 0x0000

The TS bag of PMT: the PID (also can comprise the code of representing PMT) that comprises the different code of each service

The TS bag of NIT: 0x0010

Represent in pairs among the PAT to serve value of the program number that is provided with and serve the PID of the PMT that is provided with by each by each.These data are write on the zone of the zone of " program_number " of PAT and " program_map_PID ".For example, under the situation that five services S1, S2, S3, S4, S5 are arranged, there are 5 PMT.PID at 5 PMT is respectively under the situation of " PMT-PID1 ", " PMT-PID2 ", " PMT-PID3 ", " PMT-PID4 " and " PMT-PID5 ", comprises the data of following correspondence table among the PAT.

＜table 1 〉

The PID of the PMT that service is corresponding

S1 PMT-PID1

S2 PMT-PID2

S3 PMT-PID3

S4 PMT-PID4

S5 PMT-PID5

The PID that represents the high-quality TS bag of the service corresponding among the PMT with this PMT.These data are written in " elementary_PID " zone of PMT.

Therefore, if determined service, then can discern the PID corresponding to the PMT of service from table 1, the PID by this PMT determines a PMT, and as if having determined PMT, the TS that has then determined to comprise the quality data of this service wraps.

In addition, comprise descriptor among the PMT.Paired expression is by the value of the program number of each service setting and the IP address of the IP bag that sends service in the descriptor.For example, make the IP address of the IP bag that comprises the data of serving S1 with corresponding by " PMT-PID1 " definite PMT.In addition, make the IP address of the IP bag that comprises the data of serving S2 with corresponding by " PMT-PID2 " definite PMT.Like this, can from 5 PMT, obtain serving correspondence table with the IP address.In addition, descriptor also can be contained among the NIT.

In addition, also can replace PSI, use SI (information on services), store above-mentioned information.

In addition, also PSI maker 18 can be arranged in the processing unit 8, it is contained in the high-quality TS bag stream, perhaps also can be arranged in the processing unit 9, it is contained in the low-quality TS bag stream.

Fig. 2 has represented at the data configuration image that transmits on the channel 14.Though in fact also transmit SI or PSI, since identical with general digital broadcasting, so omitted diagram.

When transmitting the signal of this structure, use accompanying drawing that method of reseptance is described.

Fig. 3 is illustrated in the load mode of the present invention, especially the figure of the power supply control under the situation of the quality data that receives service S1.

The quality data of service S1 sends by cohort as shown in Figure 3.Because receiving bag exported approximately from the beginning cohort, receiver spends 250ms, thus the power supply supply of beginning demodulation section before cohort receives about 250ms of beginning, and the reception storage of service S1 that will be by block transfer is in internal buffer.After block transfer stopped, the power supply that stops demodulation section being supplied with, but reproducing unit is under the state of power supply, with speed limit sense data from buffer of regenerating required, limit reproducing contents.Thus, can suppress power consumption.Afterwards, the state that receives quality data such intermittence is called " intermittently receiving mode ".Relative therewith, the state that receives low quality data continuously is called " converted channel pattern ".

＜execution mode 1 〉

Fig. 4 is the figure that an execution mode of the method for reseptance when converted channel of the present invention receives is described.

Now, if under the intermittence receiving mode, receive service S1 at moment t0, at the user interface of moment t1 user operate services selector button etc. with selections service change for after serving S2, then connect the power supply of the acceptance division of receiver, enter into the converted channel pattern.Use from PSI or SI (for example the correspondence table of the inferior loop of PMT (second loop) and service that NIT) obtains and PID, with the correspondence table of service and IP address, receiver takes out the low quality data of service S2 from low-quality TS bag stream (being also referred to as " converted channel is with flowing "), and begins regeneration.Simultaneously, wait for the reception of the quality data group of accepting service S2.

In the converted channel pattern, for the low quality data of regenerating, preferably using LED, lamp, sound, the interior captions of screen to wait is the converted channel pattern to user notification.

Under this state, if by user's operation service S3 is carried out channel selection under moment t2, then receiver takes out the low quality data of service S3 from converted channel with flowing, and begins regeneration.Simultaneously, wait for the reception of the quality data group of accepting service S3.Further, if carry out channel selection by user operation and to service S1, then receiver with taking out the low quality data of service S1 the stream, and begins regeneration from converted channel, and waits for the reception of the quality data group of accepting service S1 in moment t3.

In operation so far, owing to do not detect the cohort front end of this service in the channel selection now in the burst data, so under any circumstance all still be the converted channel pattern.

Then, if moment t4 by user operation channel selection service S4, then receiver with the low quality data of taking out service S4 the stream, begins regeneration from converted channel, and waits for the reception of the quality data group of accepting service S4.

At moment t5, if send the cohort of selected service S4, then receiver directly begins to serve the reception of the cohort of S4, begin the regeneration of quality data and enter into the cohort receiving mode, simultaneously, at cohort moment of next service S4 from moment t6 to transmission t7, stop the power supply of acceptance division is supplied with.

In addition, in the present embodiment, though by the correspondence table of SI or the PSI service of transmitting with the PID of the TS bag that is used to transmit quality data, the form of correspondence table is not limited to this, also can transmit in cohort 10 or transport stream 11.If have the receiver of communication line, then also can transmit by communication line.Service is also identical with the correspondence table of the IP address that the IP that is used to transmit low quality data wraps.In addition, also can use other paths, the Internet.

(structure of receiver, action)

Fig. 5 represents to implement the structure of the receiver of above-mentioned method of reseptance.Receiver 20 comprises user interface (below be called " UI ") 21, receives control part 22, power control part 23, OFDM demodulation section 24, TS decoder 25, IP bag extraction unit 26, buffer 27, MPEG4 decoder 8 and pattern display part 29.UI21 receives the operation (for example button presses) based on the user, and this operation information is sent to reception control part 22.Pattern display part 29 can and can carry out the display unit that captions show by LED, lamp, voice output unit and constitute.Below, the action of receiver 20 is described.

If on UI21, carried out services selection button based on the user by inferior operation, or carried out the connection of the power supply of receiver, then receive control part 22 and the converted channel pattern is set is used as pattern.In this converted channel pattern, the user can limit operation UI 21, and the service (converted channel processing) of reading wanted is switched on the limit one by one.Receive control part 22 in order to be received in the service of selecting on the UI21, and the indication of connecting the power supply of OFDM demodulation section 24 by power control part 23.At this moment, receive the settings on OFDM demodulation section 24 simultaneously such as frequency information of service (channel) that control part 22 will last time receive and the service that should receive that is predetermined.

If OFDM demodulation section 24 is connected, then receive ofdm signal, according to the ofdm signal demodulation TS bag that is received, obtain the PSI (or SI) that comprises program configuration information etc., and, deliver to and receive control part 22 through TS decoder 25.Receive control part 22 and analyze PSI (or SI), take out service and the correspondence table of PID and the correspondence table of service and IP bag, for low quality data, the PID (bag identifier) of identification TS bag and the IP address of IP bag, indication should be by the PID of TS decoder 25 decoding, and the low quality data of selected service is carried out the IP address of the IP bag of conveyance to IP bag extraction unit 26 notices.

25 decodings of TS decoder have the converted channel stream by the service of the PID that receives control part 23 appointments.IP bag extraction unit 26 is extracted the IP bag at selected service place out from the stream after the decoding, and sends in the MPEG4 decoder 28.MPEG4 decoder 28 wraps according to the IP that is extracted out and begins content regeneration.

In the converted channel pattern, for the low quality data of regenerating, using pattern display part 29 to notify the user is the converted channel pattern.Pattern display part 29 uses LED, lamp, sound, captions demonstration to wait next content in user notification moves under the converted channel pattern.

Except above-mentioned action, receive control part 22 and further analyze PSI, the PID of the bag of conveyance in the burst data (timeslice) that comprises the quality data relevant with selected service is determined, and notify its PID to TS decoder 25.TS decoder 25 monitors the burst data that whether has received selected service.

If confirm to have received the burst data of selected service, then TS decoder 25 carries out the decoding of this burst data.Further, IP bag extraction unit 26 is extracted from the MPEG4 paragraph header for needing time Δ t till next burst data of reception of selected service, and is provided with at power control part 23, and simultaneously, regeneration IP wraps and is kept in the buffer 27.

If a certain amount of storage in buffer 27, is then supplied with MPEG4 decoder 28 with the data behind the buffer memory to regenerate speed required, and by the MPEG4 decoder 28 video voice data of regenerating, and output video, sound.

If begin regeneration from the quality data of buffer 27, the regeneration of data of the low-quality converted channel before then stopping simultaneously.After power control part 23 is provided with time Δ t, enter into intermittently receiving mode.

In the intermittence receiving mode, power control part 23 is for after the finishing receiving of the burst data before the selected service, and to the reception period of next burst data of beginning (that is, till elapsed time Δ t only), the power supply of OFDM demodulation section 24 is made as OFF.Power control part 23 is connected the power supply of OFDM demodulation section 24, and is begun the reception of next burst data of selected service after receiving the zero hour for next.

The further detailed action of receiver 20 is described.Fig. 6 A, Fig. 6 B are the flow charts that the reception of receiver 20 is handled.

After connecting the power supply (S101) of receiver 20, the ofdm signal of demodulation assigned frequency, and regenerative transmission stream.The frequency of the channel that receives when here, so-called assigned frequency is meant last time action or the default frequency that is provided with in advance.

Then, by TS decoder 25, from transport stream, extract PSI (or SI) out (S102).Take out the correspondence table of correspondence table, service and IP address of service and PID and converted channel PID according to the NIT of this PSI (or SI) etc., further, obtain the guide look of the data relevant with each service being carried out the IP address that the IP of conveyance wraps with stream.

Then, service parameter (S103) is set.Specifically, by receiving control part 22, indicate the PID of the TS bag that should decipher, and notify the IP address of the IP bag of the data that are used for the selected service of conveyance to IP bag extraction unit 26 to TS decoder 25.

Then, implement the decoding (S104) of this bag.That is, take out TS decoder 25 decoding IP bag back from the TS bag of indicated PID.

IP bag extraction unit 26 is extracted IP bag content, that have notified IP address (S105) that transmits selected service out from the IP bag that is taken out, and passes in the regeneration module that comprises MPEG4 decoder 28 and buffer 27.

The content (S106) of regeneration module regeneration converted channel video, sound etc., and output to screen, loud speaker etc., simultaneously, the reception of the burst data that comprises quality data that the content in wait acceptance and the regeneration is corresponding.

Have or not the last handoff request to other services (S107) of UI21 by receiving control part 22 judgements based on the user.Not existing under the situation of the handoff request of other services, begin the reception of the burst data (timeslice) of this content, and store the burst data that is received in the buffer 27 (S108).

If the buffer memory of burst data is finished (among the S109 being), then, enter into the receiving mode at intermittence (S110) of intermittently controlling the power supply of receiver module according to the information Δ t of the delivery time of next burst data of expression that comprises in the burst data.Afterwards, before the handoff request that the service selected is arranged, replace low-quality converted channel content regeneration, output (S111) after the high-quality content of regeneration from burst data.

In addition, under the situation that converted channel is made of two or more streams such as literal and rest images with stream, also can select the stream of regenerating according to the ability of receiver and user's hobby.

In addition, the content that converted channel is used also can be the low-quality data behind the high power compression quality data, also can be rest image and the sound relevant with content, or only be sound.

In addition because with low uncertainty from the regeneration quality of converted channel pattern when intermittence, receiving mode entered, so also can after the burst data that repeatedly receives selected service, carry out from converted channel to intermittence receiving mode switching as further condition.

(variation 1)

Variation in illustrating during the above-mentioned converted channel with reference to figure 7A～Fig. 7 C to the stores processor of buffer 27.In this example, from intermittence receiving mode when the converted channel pattern enters, when the converted channel pattern, before having selected different services by the user, the burst data of the service that will receive under the receiving mode at the intermittence before will entering continues to remain in the buffer 27.

In this example, owing to parallel implement low-quality converted channel with the processing of data and the buffer memory control of high-quality burst data, control with the buffer memory of the processing of data and burst data and describe so be divided into converted channel.

At first, use Fig. 7 A, Fig. 7 B that the processing of low-quality converted channel with data is described.

When the power connection of receiver, or by based on user's services selection button when having selected service, enter into the converted channel pattern by inferior, to OFDM demodulation section 24 supply powers, and begin the demodulation (S101b) that all send signals.

Then, from transport stream, extract PSI (or SI) out (S102), and obtain the guide look of converted channel with the PID of PID and burst data.Further, from transport stream, obtain the guide look of the IP address that service is transmitted.

Then, service parameter (S103) is set.Concrete, by receiving control part 22, indicate the PID of the bag that should decipher, and the data of selected service are carried out the IP address of the IP bag of conveyance to IP bag extraction unit 26 notices to TS decoder 25.

Then, implement the decoding (S104) of TS bag.That is, TS decoder 25 is deciphered the IP bag back taking-up of specified PID.

IP bag extraction unit 26 is extracted IP bag content, that have the IP address of being notified (S105) that transmits selected service out from the IP bag that is taken out, and passes in the regeneration module that comprises MPEG4 decoder 28 and buffer 27.

The content (S106) of regeneration module regeneration converted channel video, sound etc., and output to screen, loud speaker etc., simultaneously, the reception of the burst data that comprises quality data that the content in wait acceptance and the regeneration is corresponding.

By receiving the switching indication (S107) that control part 22 judgements have or not the user on the UI21 to carry out to other services.Do not exist under the situation that the switching of other services is indicated, receive control part 22 and begin the reception (S121) of the burst data of this content, and the service (cache object) that should store in buffer 27 decision (determining) is the service (S122) of (in the selection) in the present audiovisual.

Then, use Fig. 7 C that the caching process of burst data is described.

Buffer 27 is proceeded the storage (S123) of burst data for the service that receives before being about to begin in converted channel.Whether judgement has determined audiovisual service (S124) in described step S122.Under the situation that has determined audiovisual service, carry out the whether identical judgement (S125) of service of audiovisual before carrying out the service that determined and converted channel being about to begin.Under identical situation, because the timeslice of this service is the data of now storing in buffer, so enter into step S128, the regeneration of beginning quality data, the content of output video, sound etc.

On the other hand, in S125, under the situation different, remove buffer 27 with the service of last time audiovisual, and the burst data (S127) of the new service of selecting of buffer memory, and the regeneration (S128) of beginning quality data.

As above like this, during converted channel in, proceed the buffer memory of the content of the service of audiovisual before converted channel is about to begin.Thus, in during converted channel, after having selected various services, the service of audiovisual was used as under the situation of audiovisual service before final selection converted channel was about to begin, owing in buffer 27, stored the burst data of this service, so the effect that can carry out high-quality audiovisual is arranged at once.

(variation 2)

This variation 2 is further to have improved another example of the caching process of variation 1.Because the processing of converted channel data is identical with the variation 1 shown in Fig. 7 A, the 7B, so omit detailed explanation.

The flow chart of use Fig. 8 illustrates the buffer memory control in this example.

Receive control part 22 if enter into the converted channel pattern, can carry out the reception of total data, then irrespectively receive the burst data of all timeslices, and store (S131) in the buffer 27 into service and become.At this moment, the timeslice that in the end receives of buffer 27 is rewritten.

Receive control part 22 and judge in described step S122, whether to have determined audiovisual service (S132).Be judged as under the situation that has determined audiovisual service, carrying out the service of the burst data of storage in buffer 27 now, the judgement (S133) whether identical with the service that has determined audiovisual.If identical,,, begin the regeneration (S136) of quality data so keep original state because the burst data of this service is stored in the buffer 27 now.Thus, the content of output video, sound etc.

On the other hand, under the service of the data in being judged as buffer 27 situation inequality (among the step S133 not) with having determined the service of audiovisual, remove buffer 27 (S134), and the burst data that will determine the service of audiovisual stores (S135) in the buffer 27 into, the regeneration (S136) of beginning quality data enters into intermittently receiving mode thus.

As above like this, in this example, during the converted channel pattern in, receive all burst datas (timeslice), and irrelevant, and the burst data of always passing through to be received is upgraded buffer 27 with the service after the institute channel selection.Thus, under the situation that audiovisual has been determined in the converted channel pattern, if the burst data of the service that existence is selected buffer 27 in then can be carried out the regeneration of quality data at once.

In addition, under the enough big situation of capacity register, also can be during converted channel in, the timeslice of all services of buffer memory, and upgrade buffer 27 by the service (that is each data of the part in the buffer 27) that each received.Thus, compared with the above case can carry out the rapid regeneration of quality data in high probability ground.

(variation 3)

In the variation of above explanation, determine that when the converted channel pattern condition of audiovisual service is " receiving the burst data (timeslice) corresponding with the content in the converted channel audiovisual " (with reference to the step S121 of figure 7B).In this variation, the condition of determining audiovisual service is established the clearly indication (operation) of doing the user.

In this variation, when switching based on user's service, in order to stop the audiovisual of current service, append step judge think the audiovisual of wanting to carry out other services, still be temporarily to want other service (wanting to have seen hastily (peek)) of audiovisual in the audiovisual that continues present service midway (for example the time of CM etc. in).

For example, in the user's operation when service is switched, when supressing the channel button, be judged as and represent the former, when supressing channel increase and decrease button, be judged as the expression latter.That is, judge that the button of pressing is channel increase and decrease button or channel button, under the former situation, carry out the caching process identical, in the latter case, carry out the caching process identical with the processing of variation 2 with the processing of variation 1.Use the flow chart of Fig. 9 to illustrate in greater detail this situation.

Operation when the service of judgement is switched is based on the channel button and also is based on channel increase and decrease button (S141).Beginning by pressing of frequency reel number button under the situation that service switches, regarding as and think that the user wants other service of audiovisual, and shown in the flow chart of Fig. 8, carry out upgrading the buffer memory control (S143b) of buffer 27 by last received service.

On the other hand, if the operation by channel increase and decrease button has begun the service switching, then regard as and think that the user wants temporarily to have a look at other service, do not carry out the decision of audiovisual service, and wait for the reception (S142) of the burst data (timeslice) of selected service.If received the burst data of selected service, then shown in the flow chart of Fig. 7 C like that, continue the data of the service converted channel begins before, selected and the buffer memory that carries out buffer memory is controlled (S143a).

In addition, according to user's will (judged result of step S141), suitably use one of them buffer memory control of variation 1 or variation 2 to be used as caching process, thereby can begin high-quality regeneration apace based on timeslice.

(variation 4)

In Shuo Ming the variation, the regeneration of the low quality data during from the converted channel pattern is " reception by the burst data (timeslice) corresponding with the content the converted channel audiovisual decides audiovisual service " (with reference to the step S121 of figure 7B) to the switching condition of the regeneration of quality data in the above.But, under situation about switching, if in converted channel, continue the same service of audiovisual in several seconds by this condition, even then the user does not determine the service of audiovisual, also enter into the regeneration of quality data automatically,, have and concerning the user, feel seeing uncomfortable situation so the regeneration quality sharply changes.Therefore, in this example, the structure that is used to address this is that is described.

Figure 10 A, Figure 10 B are the flow charts that addresses the above problem usefulness.Because the flow process of the integral body of Figure 10 A is identical with Fig. 7 A, so omit explanation.In addition, though the flow process of the integral body of Figure 10 B and Fig. 6 B are roughly the same, in Figure 10 B, be provided with judge have or not on the UI22 based on difference aspect the step (S151) of the input of the channel selection decision operation of user's operation.In step S151, for example, the push-botton operation of decision is selected in the expression that judgement has or not the user on the UI22 to carry out.Show the button of selecting decision by user operated table, recognize afterwards to high quality graphic and switch, so sensation that can the rude switching of oriented reproduced picture quality.

In this example, received with before converted channel audiovisual in the corresponding burst data (timeslice) of content, and during the push-botton operation that the expression selection that exists the user to carry out determines (S151), by beginning high-quality regeneration, the unexpected variation of reproduced picture quality in can preventing during converted channel, user's sticky feeling in the time of can reducing audiovisual.

(variation 5)

Then, illustrate that the reception that receives usefulness intermittence when implementing data reproduction in groups handles.

As shown in figure 11,, certain burst data is finished receiving back required time till the reception of next burst data establish and make Δ t, the duration (reception began to the time that receives termination) of burst data is established and makes Δ d for selected service.These time Δ t, Δ d with each burst data in (for example, in the paragraph header in the TS of each burst data stream) field situation about transmitting under, receiving control part 22 also can be under the situation of the signal of the form that the duration Δ d that receives burst data transmits, in the same manner time Δ d is arranged on the timer of power control part 23 with time Δ t, behind the effluxion of time Δ d, stop to supply with to the power supply of OFDM demodulation section 24.

Thus, do not need to see the cohort border in the reception, the power supply control that cohort receives usefulness becomes easy.

(variation 6)

Then, the variation after the correction of the value of the Δ t that uses in burst data receives is improved describes.Actual burst data constitutes by a plurality of sections, in the burst data, comprises and required time (Δ t) relevant information till the reception of next burst data by each section respectively.For example, as shown in figure 12, three sections are provided with respectively needs time Δ t1, Δ t2, Δ t3, and these information are sent in burst data.

At this moment, obtain from first section of burst data need time Δ t1=T1, from second section obtain need time Δ t2=T2, obtain need time Δ t1 to obtain need time Δ t2 the elapsed time=during T3, receiver 20 will (value of (T1-T3)+T2)/2 be established and is made the new time Δ t that needs.Thus, the transmission shake (jitter) that needs time Δ t can be suppressed to be Min..

(variation 7)

Then, the embodiment after switching (seamless) from the regeneration of the low quality data image no transition when the regeneration of quality data image and improving is described.

Figure 13 is the figure of the generation of explanation transmission signal of the present invention.Identical with the signal basic handling of Fig. 1, still, append the processing relevant with the timeslice offset information aspect different.Below, be that the center describes with this difference.

As previously mentioned, provide service S1, S2, S3, S4, S5 from content source 2,3,4,5,6 respectively.The content encoding that each content source is provided is the quality to same high-quality service and two grades of low quality, and provides as IP bag 7,7b.In the present embodiment, especially respectively content source 2,3,4,5,6 is provided with timestamp side-play amount test section 16.

Because in free dependent data transmit, the agreement common RTP of use (RTP) etc., that support the time information (timestamp) of playback of data, transmit flow data, so the encoder by has separately added different timestamps in two streams of content unanimity.

Timestamp side-play amount test section 16 detects the time difference Δ T of the time stamp T b of the time stamp T a of the demonstration of representing certain picture added on the RTP head of using at quality data and the demonstration of representing same picture added on the RTP head that low quality is used as the timestamp side-play amount.Should be input to PSI maker 18 by time difference Δ T, and in the stream of PSI (or SI) or low quality data, send.Expression is served the value and the time difference Δ T of the program number that is provided with by each in pairs in the descriptor of PMT.

Should deliver to receiver by time difference Δ T, in receiver, the time stamp T b that Δ T is added to low quality data goes up or deducts Δ T from the time stamp T b of low quality data, and get quality data and low quality data video synchronously.In addition, also can the time stamp T a by Δ T being added to quality data go up or deduct Δ T from time stamp T a, get quality data and low quality data video synchronously.

Use Fig. 4 illustrates the method for reseptance when transmitting the signal that comprises this time offset.

If by the user service S4 that operated channel selection, then receiver 20 with the low quality data of taking out service S4 the stream, begins its regeneration from converted channel at moment t4, meanwhile, wait for the reception of the high-quality burst data of accepting service S4.At moment t5, if send the burst data of service S4 here, then receiver 20 reception of burst data of service S4 that will begin in a minute.

Afterwards, for described service S4, the timeslice side-play amount (Δ ts=ts1-ts2) that use is represented the difference of the timestamp (ts1) that comprises in the timestamp (ts2) that comprises in low quality data and the quality data is proofreaied and correct the timestamp (tsa) that comprises in the quality data and is the value on the time shaft of low quality data.

tsa＝ts1-Δts＝ts1-(ts1-ts2)＝ts2

And, equating with corrected value or surpassing in its timing, the regeneration of beginning quality data.

If finishing receiving of burst data then enters into intermittently receiving mode, till the moment t7 from moment t6 to next burst data that sends service S4, stop to supply with to the power supply of OFDM demodulation section 24.

By above method, can make the timestamp of two different streams of quality synchronous, the smooth switching of the regeneration action of the quality data of the regeneration that can carry out the low quality data from the converted channel pattern in the intermittence receiving mode.

In addition, in above-mentioned example, the example that timestamp offset information and low quality data are transmitted simultaneously has been described, but also can have transmitted simultaneously with quality data.

In addition, be under the situation of transport stream of MPEG2 when stream, also can replace timestamp, and use PCR (Program Clock Reference).

＜execution mode 2 〉

In the present embodiment, send rest image and voice data and be used as low quality data.Other structures are identical with execution mode 1.

Promptly, quality data is made of the data that the average transfer rate 350kbps with moving image and sound implements after MPEG4 compresses, on the other hand, low quality data is by constituting for rest image and sound stream with the quality data identical content, and 64kbps compresses with average transfer rate.In addition, numerical parameter, compression method are put down in writing as an example in order to make easy understanding, do not limit the parameter among the present invention.

Figure 14 represents to transmit the structure of the receiver under the situation of signal of said structure.Receiver 20 shown in Figure 14 further has rest image obtaining section 30, rest image buffer 31 and switch 32 except the structure of receiver shown in Figure 5 20.Elemental motion is identical with receiver 20 shown in Figure 5.

Rest image buffer 31 storing static image data.

Communication line 33 is connected on the rest image obtaining section 30, with can be from obtaining data from external equipment or network.

Switch 32 was selected during receiving mode to export as video from the data of MPEG4 decoder 28 at intermittence, and selection is used as video from the Still image data of rest image buffer 31 and exports when the converted channel pattern.

In the present embodiment, in the converted channel pattern, from the IP bag of extracting out by IP bag extraction unit 26, recover rest image, and be stored in the rest image buffer 31 with low quality data as converted channel by rest image obtaining section 30., with the sound in the data IP relevant with the sound of extracting out by IP bag extraction unit 26 wrapped by regenerating after the MPEG4 decoder for decoding for converted channel.On the display part 29 of receiver, show image from the rest image buffer, simultaneously, from output sounds such as loud speakers.

Be used as the converted channel low quality data by such transmission rest image, be used as converted channel with the translatory movement image and compare, the regeneration quality of the sound in the time of can improving the converted channel pattern with the situation of low quality data.

In addition, also can only send sound and rest image one and be used as the data that converted channel is used.For example, under the situation that only sends sound, receiver 20 is obtained by communication line 33 and is served relevant rest image.Concrete, receiver 20 is obtained the information relevant with service of rest image etc. by communication line 33, and is stored converted channel in advance into in the rest image buffer 31 when prior or converted channel pattern.And, also can be when the converted channel pattern, receiver 20 make sound with converted channel with rest image buffer 31 in the rest image of storage be reproduced in and be presented on the screen.In addition, owing to produced communication cost usually when obtaining data,, make the notice of carrying out this content to the user after getting the information, to begin to obtain action so the unit of the action of receiver control 20 also can be set based on communication line 33.

In addition, also can constitute rest image obtaining section 30 by receiver with rest image trimming function.At this moment, rest image obtaining section 30 also can be in each service with the frequency of stated number (for example, if send the service of 10 minutes video, be 10 minutes frequencies once) receive the burst data (timeslice) of this service, and from the burst data that is received, extract suitable rest image out, and put into converted channel with in the rest image buffer 31.As the method for from burst data, extracting rest image out, for example consider to extract out the I picture.Also can in the converted channel pattern, export rest image and sound according to this method.

(variation)

Transmission rest image in the present embodiment is used as converted channel to be described with the improvement example of the method for reseptance under the data conditions.

Figure 15 is the figure that expression transmits the data configuration image on the channel 14.

Among this figure, burst data (timeslice) 10 transmits the quality data of service S1～S5.Burst data is that moving image and voice data are implemented the data that obtain after the MPEG4 compression with average transfer rate 350kbps.Each converted channel of serving S1～S5 with low quality data bag 11s1～11s5, being comprised: the rest image of the 2kbyte of the moving image that representative transmits in the burst data (timeslice) of each service S1～S5; With the sound that will in a burst data (timeslice) of quality data, transmit, the about 8kbps of boil down to and the voice data in about 5 seconds of obtaining.

The service number that transmits in a timeslice mixes with the signal of DVB-T standard and under the situation about transmitting, as this example be several about.Therefore, in the timeslice duration (about 130msec) in the converted channel stream 11 of average transfer rate 64kbps, can transmit low quality data bag 11s1～11s5 of all service S1～S5.

Receiver 20 can receive all converted channel low quality data bag relevant with other services in the reception while of the burst data relevant with selected service.Therefore,, do not need to make the power supply of OFDM demodulation section 24 to be on-state, by only in burst data receives, being connection (with reference to Figure 15) can not have stand-by period ground output rest image and sound in order to receive converted channel low quality data bag always.

＜execution mode 3 〉

Figure 16 is the figure of generation that is used to illustrate the transmission signal of present embodiment.Figure 16 compared to Figure 1 difference is that the output of output device 9 is not input to multiplexer 12 and is input to processing unit 8, and further adds buffer B6 on processing unit 8.In addition, Figure 17 is the figure of the data configuration of explanation on transfer channel.As Figure 16, shown in Figure 17, in the present embodiment, the low quality data for being used to show when the converted channel pattern sends as burst data in the same manner with quality data.

Among Figure 16, will be encoded to the quality of high-quality and two grades of low quality respectively, and provide as IP bag 7,7b from service S1, S2, S3, S4, the S5 that content source 2,3,4,5,6 provides.

Generation for the IP bag 7 behind the high-quality coding is identical with the situation of described execution mode.Below, illustrate that the IP behind the low quality coding wraps 7b.

IP bag 7b behind the low quality coding is input to processing unit 9, and is encapsulated as transport stream packets, further generate the transmission package of all service S1～S5 has been carried out multiplexed continuous transport stream 11.The transport stream 11 that will comprise low quality data is input in the processing unit 8.

To be input to buffer B6 to about 5 seconds of the low-quality TS bag stream 11 of processing unit 8 inputs from processing unit 9, and export from processing unit 8 as a cohort 15.At this moment, the processing of processing unit 8 and quality data generates the converted channel burst data 15 between broadband, short-term in the same manner from the transport stream 11 that comprises low quality data.Comprise the TS bag group S0 that uses with low-quality TS bag stream 11 converted channel suitable, that added identical PID address in the cohort 15.

On the section of converted channel, add the temporal information be used to represent send the timing of corresponding high-quality cohort with cohort 15.A plurality of cohorts 10 of block transfer and converted channel be with cohort 15 successively, and deliver in the multiplexer 12.In multiplexer 12, burst data is carried out multiplexed with four kinds of form PAT, PMT, CAT, NIT being generated by PSI maker 18.

That is, transmitting channel is made of the quality data that constitutes cohort by each service and converted channel cohort with low quality data.

As mentioned above, in the present embodiment, as shown in figure 17, constitute quality data of burst data and converted channel burst data transmitting to transmit on the channel 14 with low quality data by each service.

Below, come the method for reseptance under the situation of the signal that receives above-mentioned load mode is described with reference to Figure 18.Here, quality data is that moving image and voice data are come data after the MPEG4 compression with average transfer rate 350kbps, low quality data is for moving image and sound, comes data after the MPEG4 compression content identical with quality data with average transfer rate 64kbps.In addition, the numerical parameter among the figure is for easy understanding, and the parameter as an example record is not limited to the parameter among the present invention.

Among Figure 18, select service S1 at moment t0, and receive under the receiving mode at intermittence.If operated the UI21 of channel button etc. moment t1 user, and channel changed into service S2, the power connection of OFDM demodulation section 24 then, and enter into the converted channel pattern.

Because constantly, do not send converted channel,, continue regeneration and serve S1 so arrive the reception converted channel with before the burst data 15 at moment t2 with burst data 15 at this.Received converted channel with after the burst data 15 at moment t2, selected service S2 during, receiver with the low quality data of taking out service S2 the burst data 15, carries out its regeneration from converted channel.If under this state, operate by the user at moment t3 and to have selected service S3, then receiver begins to regenerate after with the low quality data of taking out service S3 the burst data 15 from converted channel.

Afterwards, selected service S4 as if operating by the user at moment t4, then receiver with the low quality data of taking out service S4 the cohort 15, begins regeneration from converted channel.At moment t5, if detect burst data situation about sending, then begin to serve the reception of the burst data of S4 immediately, the regeneration of beginning quality data and enter into the cohort receiving mode to service S4.At this moment, stop to supply with till the moment t7 that next burst data from moment t6 to service S4 is sent out to the power supply of OFDM demodulation section 24.

Then, be included in owing to the information (Δ t) relevant in the burst data of service S4, so can from the data that receive, learn with the moment t7 that should begin to receive.In addition, low quality data also can be the data that obtain behind the high power compression quality data, also can be by the combination of rest image relevant with content and sound, only for sound or only constitute for rest image.

In addition, by using in the burst data 15 in the converted channel that transmits low quality data, delivery time information (Δ t) before sending the burst data that next quality data is transmitted, thus can carry out from of the smoothly switching of converted channel pattern to the receiving mode at intermittence.

In addition, after the converted channel pattern is about to begin, to receiving converted channel with during till the burst data, need the demonstration of the image of waiting for content, but when converted channel pattern channel once more midway switches, owing to received the converted channel burst data, shown so can switch image immediately.

In addition, also can be when not being the common audiovisual of converted channel audiovisual (during the converted channel pattern) when receiving mode (intermittently), regularly receive the converted channel burst data, be stored in the buffer.Thus, the demonstration stand-by period in the time of can eliminating service in the converted channel pattern and switch.Further, also can be by user's setting, the converted channel during to common audiovisual is specified with the regular receive frequency of burst data.Thus, of the reception of unwanted converted channel can be suppressed, the consumption of power can be suppressed with burst data.

＜execution mode 4 〉

Figure 19 represents another routine block diagram of the receiver of present embodiment.Present embodiment further has converted channel buffer 34 and switch 32 except structure shown in Figure 5.Converted channel can be the recording medium that can load and unload with buffer 34.

Converted channel is used for the converted channel of the low quality data of picture demonstration and stores with data when comprising the converted channel pattern with 34 pairs of buffers.Switch 32 switches in the image that shows on the receiver.Concrete, switch 32 is in the intermittence receiving mode, selection is exported after the high-quality view data of MPEG4 decoder 28 outputs, in the converted channel pattern, selects low-quality view data (for example Still image data) the back output of reading with buffer 34 from converted channel.In addition, for sound, the voice signal of output after by MPEG4 decoder 28 decoding, and with intermittence receiving mode, converted channel pattern irrelevant.

In the converted channel pattern, when switching to other services that not do not receive, in other converted channel during with the obtaining of data, the channel selection processing by tuner etc. have spent time of a certain degree.In the present embodiment, when the switching of serving is described, realize showing smoothly the structure of switching usefulness in the converted channel pattern.

In the present embodiment, during the burst data that does not receive selected service (channel) (timeslice) in, receive the converted channel data of other services, and scheduled store to converted channel with in the buffer 34.And, in the converted channel pattern, when having selected other service (channel), regenerate after reading out in the data of this service of converted channel with storage in the buffer 34.Thus, when the converted channel pattern, can switch image fast and show.At this moment, after preferably the data that will preserve in buffer 34 are converted to the little form of capacity such as sound rest image, preserve.

In addition, in the respective embodiments described above, preferably different to each service assignment address, IP address of IP bag makes receiver side not distinguish low quality data and quality data ground is handled.Preferably the IP of for example S1-a, the S1-b that content is identical wraps and adds identical IP address.But, even the IP address of the IP of identical quality data of conveyance content and low quality data bag uses different addresses also not have obstacle.

In addition, under the situation that a plurality of converted channel stream (text type converted channel stream and rest image type converted channel stream etc.) are being arranged, also can describe the interior converted channel of a plurality of and PMT and flow relevant information.

In addition, in above-mentioned example, converted channel stream is illustrated with the corresponding converted channel stream that is in a plurality of services in the channel, but is transmitting a plurality of channels, in each channel, comprise under the situation of converted channel stream, also can obtain identical effect.

Further, using a plurality of transmission channels to receive under the situation of service, if flowing to the converted channel in second channel, transmits the converted channel data multiplex of the service that will transmit on first channel, if use the converted channel stream that on second channel, comprises, even when receiving second channel, also can see the converted channel data that in first channel, comprise.

The present invention has illustrated specific execution mode, but for those skilled in the art, can know other a lot of variation, correction and other utilizations.Therefore, the present invention is not limited to specific the disclosing here, can be only scope by claim limit.

Availability on the industry

The present invention goes for, and switches the service (channel) of wanting audiovisual on the user limit, and carry out on the limit When the converted channel of selecting operates, can realize showing smoothly switching, and after multiplexed a plurality of service The receiving system of the numerical data that sends broadcasting, for example, to having the numerical data BW broadcasting wave The portable terminal device of receiving function is useful.

Claims (15)

1. a receiving system receives the broadcasting wave that sends after multiplexed a plurality of services,

Described broadcasting wave comprise block transfer be used for each service of conveyance content bag collection first-class and sends second of the bag that is used for the content that conveyance respectively serves with speed continuously and flows based on the required transfer rate of service;

Described receiving system have the operation that the user stipulates operating unit, receive the receiving element of broadcasting wave and decipher the regeneration unit of regenerating after the data of this reception;

On described operating unit, select a service, to receive till the first burst data relevant with this selected service during, the converted channel pattern is set is used as pattern, when the transmission of the beginning first burst data relevant, enter into intermittently receiving mode from described converted channel pattern with selected service;

In described converted channel pattern, described receiving element receives the data of the described service of having selected in described second stream, the regenerate data of second stream of this reception of described regeneration unit;

In described intermittence receiving mode, described receiving element receives the data of the described service of having selected in first-class, the regenerate first data of this reception of described regeneration unit.

2. receiving system according to claim 1 is characterized in that:

Described second stream comprises data identical with described first-class content but that its amount of information is lacked than described first data.

3. receiving system according to claim 1 is characterized in that:

Further has buffer, the first data that temporary transient storage is received for regeneration;

From described intermittence receiving mode when described converted channel pattern enters, in this converted channel pattern, select different services by the user before, in buffer, remain on the burst data of the service that receives in the receiving mode intermittence before entering.

4. receiving system according to claim 1 is characterized in that:

Further has buffer, the first data that temporary transient storage is received for regeneration;

During described converted channel pattern, described receiving element to be receiving the data of all services in first-class with the irrelevant mode of selected service, and uses the described buffer of first Data Update that is received all the time.

5. receiving system according to claim 1 is characterized in that:

Further has buffer, first data that receive in order to regenerate and temporarily storing;

According to the kind of the button that in described converted channel pattern, is used to serve the operation when switching, and make the control difference of described buffer.

6. receiving system according to claim 1 is characterized in that:

On described operating unit, when the predetermined operation of the meaning of the selection decision of having carried out audiovisual service by the user, the regeneration of the first-class data of beginning in described intermittence receiving mode.

7. receiving system according to claim 1 is characterized in that:

The demodulating unit that further has demodulated received signal;

In received signal, comprise under the situation of information of duration of burst data of first each service of expression, begin through after the described duration, stop to supply with to the power supply of described demodulating unit in reception from the burst data of selected service.

8. receiving system according to claim 1 is characterized in that:

Described burst data constitutes by a plurality of sections, in each section, comprise under the situation of the temporal information till beginning to begin from the Data Receiving of this section to the reception of next burst data relevant with same service, according to the temporal information that comprises in described each section, to same service, proofread and correct from receiving last burst data to the time that receives till next burst data.

9. receiving system according to claim 1 is characterized in that:

To same service, obtain the poor of the first regeneration time information and the second regeneration time information that flows, and poor according to this, proofread and correct first regeneration constantly.

10. receiving system according to claim 1 is characterized in that:

Described first-class voice data and the motion image data of comprising, described second stream comprise in rest image and the voice data at least any.

11. receiving system according to claim 1 is characterized in that:

Come described second stream of conveyance through described burst data in first-class.

12. receiving system according to claim 1 is characterized in that:

The buffer that further has the data of second stream that temporary transient storage is received for regeneration;

During the burst data that does not receive selected service, receive the converted channel data of other services, scheduled store has been selected described other whens service in the converted channel pattern in described buffer, regenerate after reading out in the data of other services of storing in the described buffer.

13. receiving system according to claim 1 is characterized in that:

Represent that first-class related information with second stream is included among the PMT (Program Map Table) of PSI (ProgramSpecific Information) of first-class conveyance.

14. a method of reseptance, the broadcasting wave that multiplexed a plurality of services back is sent receives,

Described broadcasting wave comprise block transfer be used for each service of conveyance content bag collection first-class and sends second of the bag that is used for the content that conveyance respectively serves with speed continuously and flows based on the required transfer rate of service;

In described method of reseptance, selecting a service, to receive till the first burst data relevant with this service of having selected during, the converted channel pattern is set is used as pattern, when the transmission of the beginning first burst data relevant, enter into intermittently receiving mode from described converted channel pattern with the described service of selecting;

In described converted channel pattern, receive the data of the described service of selecting in second stream, and the data of second stream that this received of regenerating;

In described intermittence receiving mode, receive the data of the described service of selecting in first-class, and the first data that this received of regenerating.

15. method of reseptance according to claim 14 is characterized in that:

Described second stream comprises data identical with described first-class content but that its amount of information is lacked than described first data.

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