CN103918276A

CN103918276A - Digital broadcast receiver

Info

Publication number: CN103918276A
Application number: CN201180074674.0A
Authority: CN
Inventors: 竹内满; 有田荣治
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2011-11-08
Filing date: 2011-11-08
Publication date: 2014-07-09
Anticipated expiration: 2031-11-08
Also published as: DE112011105819T5; JPWO2013069052A1; WO2013069052A1; JP5430806B2; CN103918276B

Abstract

When it is determined that there are, in the slots of a MOST network (1), slot allocations of the maximum transmission rate that has been allocated to MPEG-TS signals or a greater transmission rate, a packet is read from a buffer (72) at an output transmission rate of the MPEG-TS signals. When the transmission rate of the MOST network (1) is smaller than the output transmission rate of the MPEG-TS signals, a request for increasing the number of allocated slots is made to a management unit, and a packet is read from the buffer after the increase of the number of allocated slots. If the packet read from the buffer (72) includes a PCR, the value of the PCR is changed to a PCR value in accordance with a system clock inputted from a PLL circuit (74) and thereafter the PCR is outputted to the MOST network (1) as an MPEG-TS signal as converted to the protocol of the MOST network (1).

Description

Digital broadcasting transmitter

Technical field

The present invention relates to the digital broadcasting transmitter being connected with loop network take MOST (Media Oriented Systems Transport: media guidance system transmission) as representative.

Background technology

In patent documentation 1, disclose as lower device: can not cause damage to the content of the MPEG2-TS with transfer rate input arbitrarily, and convert thereof into other devices of transfer rate arbitrarily.This device comprises: the circuit that extracts PCR (Program Clock Reference: program clock reference) from packet; Reproduce the PLL circuit of the system clock of 27MHz according to the value of PCR; With the packet reading circuit of output transfer rate read data packet; And in the time that packet is PCR packet, be rewritten into the PCR value replacement circuit from the PCR value of PLL circuit.In addition, in patent documentation 2, disclose following circuit: be in the transfer approach of the multiple framework TS that uses in ISDBT (Integrated Services Digital Broadcasting-Terrestrial: integrated service digital broadcasting ground) in Japanese digital broadcasting mode, delete the signal after the invalid TSP of stratum (Transport Stream Packet: transport stream packet) by output, suppressed to export transfer rate.

Prior art document

Patent documentation

Patent documentation 1:

Japanese patent laid-open 11-205789 communique

Patent documentation 2:

Japanese Patent Laid-Open 2003-115807 communique

Summary of the invention

Invent technical problem to be solved

In recent years, in-vehicle network is that MOST is connected with multiple equipment of the decoder that is built-in with video/audio sometimes, and one of them of this equipment is digital broadcasting transmitter.In this case, not hard to imagine in MOST network, collect video/audio decoder and can bring the cost of network system to decline.

But, video/audio data directly need to be sent to MOST network in the mode of numerical data, therefore there is the oppressed problem of transmission band of MOST network.For example, because video/audio data have been occupied transmission band, therefore may cause the data transmission for controlling network entirety to carry out, also transmit in pulse train (burst) mode even also may cause having successional data.

Particularly, video/audio data are to have successional signal, inapplicable burst mode transmission, therefore in the situation that being directly sent to MOST network, bring bad impact may to the communication timing of other equipment that are connected with MOST network, contrary, also may be subject to the impact of other equipment and continuity is caused damage.

In addition, patent documentation 1 is the conversion input rate of MPEG2-TS and the common device of output rating, but it is relevant to P2P (Peer to Peer: end-to-end), does not imagine multiple equipment such as loop network and is connected, the network that transmission band is occupied by these equipment.Therefore, even the invention of patent documentation 1 is applied to the such loop network of MOST, but also there are the following problems:, distribute the output line (network one side) of TS (Transport Stream: transmit stream) signal, the data of its respective amount cannot be transmitted, even if therefore temporarily retain TS output, also can produce shortage of data.

In addition, the technology of patent documentation 2 can not be applied to the broadcast mode that does not insert the invalid TSP of stratum as DVBT (Digital Video Broadcasting-Terrestrial: digital video broadcast-terrestrial).Therefore, there are the following problems: cannot tackle various digital broadcasting modes, and cannot suppress not have the transfer rate of successional data.

The present invention completes in order to address the above problem, its object is to provide a kind of digital broadcasting transmitter, this digital broadcasting transmitter can export the video/audio data of the broadcast singal receiving to network in numerical data mode, makes the reproducer being connected with loop network can suitably reproduce video/audio data.

The technical scheme that technical solution problem adopts

Digital broadcasting transmitter involved in the present invention comprises broadcast receiver system, this broadcast receiver system by by via antenna reception to broadcast wave convert the tuner of intermediate frequency signal to and the channel decoder that intermediate frequency signal converts numerical data to formed, this digital broadcasting transmitter is connected with the loop network that utilizes administrative unit to manage the distribution of number of time slots, this digital broadcasting transmitter is characterised in that, comprise: buffer, this buffer stores is utilized the packet of the digit data stream that band decoder device is converted to by intermediate frequency signal, testing circuit, the maximum transfer rate of this testing circuit detection ring l network, the information of maximum transfer rate and the time slot allocation situation of loop network that expression is dispensed to digit data stream, PLL circuit, this PLL circuit carrys out playback system clock according to the PCR value of packet, read control circuit, in the time slot allocation situation based on detected the loop network obtaining by testing circuit, the time slot that is judged to be this loop network has in the situation of the time slot allocation more than maximum transfer rate that is dispensed to digit data stream, the maximum transfer rate of this read control circuit based on loop network and expression are dispensed to the information of the maximum transfer rate of digit data stream, mode with the output transfer rate that reaches digit data stream reads out packet from buffer, and in the time that the transfer rate of loop network is less than the output transfer rate of digit data stream, this read control circuit is expanded the request that distributes number of time slots to administrative unit, after having expanded distribution number of time slots, from buffer read data packet, PCR replacement circuit, comprises PCR at the packet reading from buffer, and this PCR replacement circuit replaces to this PCR from the corresponding PCR value of system clock of PLL circuit input, and protocol conversion circuitry, this protocol conversion circuitry receives from the packet of PCR replacement circuit output, and sets it as the digit data stream of the agreement that converts loop network to and export this loop network to.

Invention effect

According to the present invention, there is following effect:, can export the video/audio data of the broadcast singal receiving to network in numerical data mode, make the reproducer being connected with loop network can suitably reproduce video/audio data.

Accompanying drawing explanation

Fig. 1 is the figure that represents the structure of the loop network being connected with digital broadcasting transmitter involved in the present invention.

Fig. 2 is the block diagram that represents the structure of the related digital broadcasting transmitter of execution mode 1.

Fig. 3 is the flow chart that represents the action of the related digital broadcasting transmitter of execution mode 1.

Fig. 4 is the block diagram that represents the structure of the related digital broadcasting transmitter of embodiment of the present invention 2.

Fig. 5 is the flow chart that represents the action of the related digital broadcasting transmitter of execution mode 2.

Fig. 6 is the block diagram that represents the structure of the related digital broadcasting transmitter of embodiment of the present invention 3.

Fig. 7 is the flow chart that represents the action of the related digital broadcasting transmitter of execution mode 3.

Embodiment

Below, for the present invention is described in more details, with reference to accompanying drawing, embodiments of the present invention are described.

Execution mode 1.

Fig. 1 is the figure that represents the structure of the loop network being connected with digital broadcasting transmitter involved in the present invention.In Fig. 1, digital broadcasting transmitter 2 involved in the present invention is disposed on loop network 1.In loop network 1, except digital broadcasting transmitter 2 and administrative unit 3, be also connected with multiple electronic equipments, these electronic equipments are generically and collectively referred to as other equipment 4.Suppose that loop network 1, for MOST network, is suitably recited as MOST network 1 herein.

Administrative unit 3 is the devices that exist as the manager on network, has the user interface of for example utilizing the various input equipments such as keyboard, remote controller, has via this user interface the indication of being inputted by user is dispensed into the effect on MOST network 1.Administrative unit 3 has the function (video/audio decoding) that the MPEG-TS signal that the electronic equipment by being connected with MOST network 1, for example digital broadcasting transmitter 2 are exported converts vision signal to, and for point out the display of vision signal to user.Thus, administrative unit 3 is accepted the indication from user, carries out the distribution (distributing the management of number of time slots) of time slot etc., control system entirety to the equipment on MOST network 1.

Fig. 2 is the block diagram that represents the structure of the related digital broadcasting transmitter of execution mode 1.In Fig. 2, digital broadcasting transmitter 2 comprises: tuner 5, channel decoder 6, TS processing department 7 and network I/F portion 8.Tuner 5 by via antenna reception to sub-broadcast ripple signal (RF signal) convert intermediate frequency signal (IF signal) to.The IF signal after tuner 5 is changed is carried out demodulation by channel decoder 6, and be converted to MPEG-TS signal.In addition, tuner 5 also can carry out multisystem lift-launch with channel decoder 6.

TS processing department 7 converts the TS transfer rate of MPEG-TS signal to the corresponding value of maximum transfer rate of MOST network 1, generate carry out after the replacement of PCR value, i.e. so-called " having processed TS signal ", the line output of going forward side by side.In addition, the structure of TS processing department 7 comprises: DeMux separating treatment circuit 71, buffer 72, PCR replacement circuit 73, PLL circuit 74 and read control circuit 75.DeMux separating treatment circuit 71 is that the MPEG-TS signal to inputting from channel decoder 6 separates (DeMux), and whether the TS packet that detects MPEG-TS signal is the circuit of PCR packet.Buffer 72 is buffers of the TS packet of store M PEG-TS signal.

PCR packet at the TS packet reading from buffer 72, PCR replacement circuit 73 utilizes the clock value reading from PLL circuit 74 to generate PCR, be rewritten to (replacement of PCR value) in this PCR packet, and export network I/F portion 8 to, be beyond PCR packet in the situation that at TS packet, directly exported to network I/F portion 8.

PLL circuit 74 is following circuit:, use the PCR value being isolated from MPEG-TS signal by DeMux separating treatment circuit 71 to carry out PLL, and reproduce the system clock of 27MHz.

Read control circuit 75 is following circuit:, determine the time slot allocation situation of MOST network 1 according to the time slot allocation status signals of inputting from testing circuit 82, and carry out the reading of MPEG-TS signal of controller buffer 72 according to this time slot allocation situation.

The time slot allocation of MOST network 1 is carried out in the following way:, according to the agreement of this MOST network 1, administrative unit 3 is given the rights of using of time slot to digital broadcasting transmitter 2.Testing circuit 82 will represent that whether MOST time slot is that the time slot allocation status signals of " having distributed time slot " exports read control circuit 75 to.

Network I/F portion 8 comprises MOST protocol conversion circuitry 81 and testing circuit 82." having processed TS signal " of being generated by TS processing department 7 converted to MOST agreement by MOST protocol conversion circuitry 81, and export MOST network 1 to.Maximum allocated transfer rate, the information of maximum transfer rate that is dispensed to MPEG-TS signal and the time slot allocation situation of current MOST network 1 of testing circuit 82 to MOST network 1 detects, and exports TS processing department 3 to.

Below, action is described.

Fig. 3 is the flow chart that represents the action of the related digital broadcasting transmitter of execution mode 1, sets forth from MPEG-TS signal being input to TS processing department 7, till export the details of the processing of network I/F portion 8 to according to this figure.

First, DeMux separating treatment circuit 71 separates the MPEG-TS signal (step ST1) of inputting from channel decoder 6.Then, 71 judgements of DeMux separating treatment circuit form whether the TS packet of the MPEG-TS signal of inputting is PCR packet (step ST2).

In the situation that TS packet is PCR packet (step ST2: be), DeMux separating treatment circuit 71 exports the PCR value of PCR packet to PLL circuit 74.PLL circuit 74 uses the PCR value of inputting from DeMux separating treatment circuit 71 to carry out PLL, reproduces the system clock (reproducing the required reference clock of MPEG-TS signal) (step ST3) of 27MHz.

In the situation that TS packet is not PCR packet (step ST2: no), DeMux separating treatment circuit 71 goes out its TS transfer rate according to MPEG-TS input, and this MPEG-TS signal is temporarily stored in buffer 72.Export read control circuit 75 to by detecting by DeMux separating treatment circuit 71 the TS transfer rate obtaining.

In addition, the testing circuit 82 of network I/F portion 8 has been grasped the situation of which time time slot (moment) being distributed by MOST protocol conversion circuitry 81, determines the time slot allocation situation of MOST network 1, and exports read control circuit 75 to.

In addition, testing circuit 82 for example judges to transmit how many data according to the time slot allocation situation of MOST network 1, and calculates average transfer rate (average " vacant " rate).

Then, read control circuit 75 is confirmed whether to have inputted MPEG-TS signal (step ST4).In the situation that not inputting MPEG-TS signal (step ST4: no), skip output and process.

Then, the time slot allocation status signals of read control circuit 75 based on inputting from testing circuit 82, the time slot allocation situation (step ST5) of confirmation MOST network 1.

Herein, in the situation that being judged as this digital broadcasting transmitter and not guaranteeing sufficient MOST time slot, read control circuit 75 is judged to be MOST time slot allocation deficiency, output holding state (step ST5: no) in TS packet, the request (step ST9) that distributes time slot to administrative unit 3 output expansions from MOST protocol conversion circuitry 81, in during before expanding, temporarily store TS packet in buffer 72 (step ST10), end process (guaranteeing after transmission band, reading and export TS packet from buffer 72).

On the other hand, being judged as while guaranteeing to have enough MOST time slots in MOST network 1, read control circuit 75 is judged to be the not output holding state in TS packet (step ST5: be), reads out TS packet and exports PCR replacement circuit 73 to.

Whether PCR replacement circuit 73 is that PCR packet is judged (step ST6) to the TS packet reading out from buffer 72 as described above.

MPEG-TS signal (TS packet) in output is not (step ST5: no) PCR packet, and PCR replacement circuit 73 directly exports MPEG-TS signal to network I/F portion 8 (step ST7).

On the other hand, MPEG-TS signal (TS packet) in output is (step ST5: be) PCR packet, PCR replacement circuit 73 will be rewritten into this PCR packet (replacement of PCR value) from PCR value PLL circuit 74, that use in the reproduction of system clock, and exports network I/F portion 8 (step ST8) to.

Then, " having processed TS signal " of inputting from PCR replacement circuit 73 converted to MOST agreement by MOST protocol conversion circuitry 81, and export MOST network 1 to.In addition, for " having processed TS signal ", PCR value is replaced rear be temporarily stored in buffer 72 and time of delay of producing is adjusted in time as described above, therefore can realize the asynchronous transmission corresponding with time of delay.

In the case of the transmission band deficiency of MOST network 1, export distributing the request expanded of number of time slots to administrative unit 3, before expanding during in, temporarily store TS signal, guaranteeing after transmission band output TS signal.In this case, by the replacement of PCR value, temporal information is integrated, therefore can not implement special processing in administrative unit 3 one sides, just reproduces.

As mentioned above, according to execution mode 1, comprising: buffer 72, the packet of the MPEG-TS signal that these buffer 72 memory by using band decoder devices 6 are converted to from IF signal, testing circuit 82, the maximum transfer rate of this testing circuit 82 to MOST network 1, represents that the information of maximum transfer rate and the time slot allocation situation of MOST network 1 that are dispensed to MPEG-TS signal detect, PLL circuit 74, this PLL circuit 74 carrys out playback system clock according to the PCR value of packet, read control circuit 75, in the time slot allocation situation based on detected the MOST network 1 obtaining by testing circuit 82, the time slot that is judged to be this MOST network 1 has in the situation of the time slot allocation more than maximum transfer rate that is dispensed to MPEG-TS signal, the maximum transfer rate of this read control circuit 75 based on MOST network 1 and expression are dispensed to the information of the maximum transfer rate of MPEG-TS signal, mode with the output transfer rate that reaches MPEG-TS signal reads out packet from buffer 72, and this read control circuit 75 is in the time that the transfer rate of MOST network 1 is less than the output transfer rate of MPEG-TS signal, distribute number of time slots to management unit requests expansion, after having expanded distribution number of time slots, from described buffer read data packet, PCR replacement circuit 73, comprises PCR at the packet reading from buffer 72, and this PCR is replaced to the corresponding PCR value of the system clock of inputting from PLL circuit 74 by this PCR replacement circuit 73, and MOST protocol conversion circuitry 81, this MOST protocol conversion circuitry 81 receives the packet of exporting from PCR replacement circuit 73, and the MPEG-TS signal setting it as after the agreement that converts MOST network 1 to exports this MOST network 1 to, this is external cannot fully guarantee that, in the situation of MOST frequency band, this MOST protocol conversion circuitry 81 is expanded request.

By said structure, can export the MPEG-TS signal of the broadcast singal receiving to MOST network 1, thereby can utilize the administrative unit 3 being connected with MOST network 1 suitably to reproduce video/audio data.

Execution mode 2.

In execution mode 2, except the structure of above-mentioned execution mode 1, TS processing department is according to MPEG-TS signal, and to only having the MPEG-TS signal of video-audio signal, that is, " local T S " classifies with other data, other data of restriction output.

Fig. 4 is the block diagram that represents the structure of the related digital broadcasting transmitter of embodiments of the present invention 2.In addition, in Fig. 4, to the structural element mark same-sign that uses Fig. 1 to illustrate in above-mentioned execution mode 1, and description thereof is omitted.The related digital broadcasting transmitter 2A of execution mode 2 is similarly disposed at the digital broadcasting transmitter on MOST network 1 with above-mentioned execution mode 1, comprises tuner 5, channel decoder 6, TS processing department 7A and the network I/F 8A of portion.

TS processing department 7A classifies other data beyond " local T S " the MPEG-TS signal of inputting from channel decoder 6, that only have video-audio signal and video-audio signal, limits the output of other data.In addition, TS processing department 7A comprises DeMux separating treatment circuit 71a, buffer 72, PCR replacement circuit 73, PLL circuit 74, read control circuit 75, data-signal buffer 76 and carousel decision circuit 77.

DeMux separating treatment circuit 71a is following circuit:, the MPEG-TS signal of inputting from channel decoder 6 is separated to (DeMux), be categorized into " local T S " and video-audio signal other data in addition only with video-audio signal.Other data for example have EPG (electronic program guiding) etc.

In addition, whether the TS packet that the DeMux separating treatment circuit 71 shown in DeMux separating treatment circuit 71a and above-mentioned execution mode 1 similarly detects MPEG-TS signal is PCR packet, and exports the PCR value of PCR packet to PLL circuit 74.

Data-signal buffer 76 be storage DeMux separating treatment circuit 71a classify in other data that obtain, by the buffer of the data of carousel transmission (repeatedly transmitting identical content with some cycles).In addition,, only the administrative unit 3 on MOST network 1 or other equipment 4 are asked, read out the data that are stored in data-signal buffer 76, and export MOST network 1 to via the network I/F 8A of portion.

Carousel decision circuit 77 is following circuit:, judge the data of carrying out carousel transmission from other data that obtain of being classified by DeMux separating treatment circuit 71a.

The network I/F 8A of portion comprises MOST protocol conversion circuitry 81a, testing circuit 82 and MOST command analysis circuit 83.MOST protocol conversion circuitry 81a and above-mentioned execution mode 1 similarly convert MOST agreement to by " having processed TS signal " of being generated by TS processing department 7A, and export MOST network 1 to.In addition, the data transaction reading from data-signal buffer 76 is become MOST agreement by MOST protocol conversion circuitry 81a, and export MOST network 1 to, and export the data that receive from MOST network 1 to MOST command analysis circuit 83.MOST command analysis circuit 83 is from going out order via the extracting data of MOST protocol conversion circuitry 81a input, the circuit that the content of order is resolved.

Then action is described.

Fig. 5 is the flow chart that represents the action of the related digital broadcasting transmitter of execution mode 2, elaborates from MPEG-TS signal being input to TS processing department 7A, till export the processing of network I/F portion 8 to according to this figure.

First, DeMux separating treatment circuit 71a separates (step ST1a) to the MPEG-TS signal of inputting from channel decoder 6.Then, DeMux separating treatment circuit 71a judges based on identification of data packets symbol whether the TS packet of MPEG-TS signal is video/audio packet (step ST2a).

In the situation that TS packet is not video/audio packet (step ST2a: no), DeMux separating treatment circuit 71a exports this TS packet to carousel decision circuit 77.

The identification of data packets symbol of the TS packet of carousel decision circuit 77 based on via DeMux separating treatment circuit 71a input, judges whether TS packet is the data (step ST3a) of carrying out carousel transmission.To carry out the data of carousel transmission (step ST3a: be) at TS packet, carousel decision circuit 77, by the classification of the data that transmit in this TS packet, stores data in data-signal buffer 76 (step ST4a).

In addition, MOST command analysis circuit 83 extracts the order comprising the data of inputting from MOST network 1 via MOST protocol conversion circuitry 81a, and the content of resolve command.Herein, in the time that order carrys out the request of data of self-management unit 3 or other equipment 4, MOST command analysis circuit 83 is judged the data (step ST5a) that whether have the data category that administrative unit 3 or other equipment 4 asks in the data that are stored in data-signal buffer 76.

In the case of there are the data of the data category that administrative unit 3 or other equipment 4 asks (step ST5a: be), MOST command analysis circuit 83 reads out the data of this data category and exports MOST protocol conversion circuitry 81a to 76 indications of data-signal buffer.Data-signal buffer 76 is according to the indication of MOST command analysis circuit 83, and the data of the data category that administrative unit 3 or other equipment 4 are asked export MOST protocol conversion circuitry 81a to.

In step ST6a, the data transaction of inputting from data-signal buffer part 76 is become MOST agreement by MOST protocol conversion circuitry 81a, and export MOST network 1 to.

In addition,, in the situation that TS packet is video/audio packet (step ST2a: be), DeMux separating treatment circuit 71a judges whether TS packet is PCR packet.Then, carry out from the step ST3 of Fig. 3 till the data transaction of video/audio packet is become MOST agreement by the processing of step ST8, and export MOST network 1 to.

As mentioned above, according to present embodiment 2, comprise: DeMux separating treatment circuit 71a, this DeMux separating treatment circuit 71a, from the MPEG-TS signal that utilizes channel decoder 6 and be converted to by IF signal, separates the packet of the packet relevant to video and voice data and other data, carousel decision circuit 77, this carousel decision circuit 77 separates from DeMux separating treatment circuit 71a the data that other data that obtain, carousel transmission is carried out in judgement, data-signal buffer part 76, this data-signal buffer part 76 is stored the packet that is judged to be the data of carrying out carousel transmission by carousel decision circuit 77 in the mode corresponding with its data category, and MOST command analysis circuit 83, this MOST command analysis circuit 83 is resolved the command context receiving via MOST network 1, that the equipment being connected with MOST network sends in command context, in the situation of the data sending request of specific data classification, this MOST command analysis circuit 83 reads out the packet of the data corresponding with this data sending request from data-signal buffer 76, and export MOST protocol conversion circuitry 81a to, MOST protocol conversion circuitry 81a receives the packet being read from data-signal buffer 76 by MOST command analysis circuit 83, export this MOST network 1 to as the MPEG-TS signal converting to after the agreement of MOST network 1.Thus, the video/audio data and other data that need synchronous driving are classified, only, in the time existing from the request of network side, export the data of carrying out carousel transmission in other data to MOST network 1, therefore can suppress the transfer rate without the data of synchronous driving.

Execution mode 3

In execution mode 3, following mode is set forth:, in the digital broadcasting transmitter that is equipped with multiple broadcast receiver systems being formed by tuner and tuning decoder, utilize respectively and unify shared information from the MPEG-TS signal of above-mentioned multiple broadcast receiver system inputs, and be again multiplexed into MPEG-TS signal, i.e. so-called " multiplexed (remultiplexing) mode again ".

Fig. 6 is the block diagram that represents the structure of the related digital broadcasting transmitter of embodiments of the present invention 3, shows the situation that is equipped with two broadcast receiver systems.In Fig. 6, to the structural element mark same-sign that uses Fig. 1 to illustrate in above-mentioned execution mode 1, and description thereof is omitted.The related digital broadcasting transmitter 2B of execution mode 3 is similarly disposed at the digital broadcasting transmitter on MOST network 1 with above-mentioned execution mode 1, comprising: broadcast receiver system, TS processing department 7B and network I/F portion 8 that broadcast receiver system, tuner 5a and the channel decoder 6a that tuner 5 and channel decoder 6 form forms.In addition, tuner 5a is the tuner identical with tuner 5, by via antenna reception to RF signal convert IF signal to.Channel decoder 6a is also the decoder identical with channel decoder 6, the IF signal after tuner 5a conversion is carried out to demodulation, and convert MPEG-TS signal to.

TS processing department 7B converts the transfer rate of the MPEG-TS signal from these two the system inputs of channel decoder 6 and channel decoder 6a to the value corresponding with the maximum transfer rate of MOST network 1, generates and export so-called " having processed TS signal " of having carried out after the replacement of PCR value.The structure of TS processing department 7B comprises: DeMux separating treatment circuit 71b, buffer 72, PCR replace TS multiplex electronics 78, PLL circuit 74 and read control circuit 75 again.DeMux separating treatment circuit 71b is following circuit:, whether to separating (DeMux) from the MPEG-TS signal of channel decoder 6 and channel decoder 6a input respectively, detecting MPEG-TS signal is PCR packet.

PCR replacement TS again multiplex electronics 78 unifies to process to table information identical the MPEG-TS signal of inputting with two systems of channel decoder 6a from channel decoder 6,

Generate and again these MPEG-TS signals are compiled into the TS signal of a MPEG-TS signal again, be i.e. multiplexed TS again.In addition, PCR replacement TS again multiplex electronics 78 is similarly PCR packet at the output packet reading from buffer 72 with PCR replacement circuit 73, utilize the clock value reading from PLL circuit 74 generate PCR and rewrite into this PCR packet (replacement of PCR value), and export network I/F portion 8 to, being beyond PCR packet in the situation that, directly export network I/F portion 8 to.

In addition, stipulated table information in MPEG-TS signal, this table information represents the relation between the program comprising in MPEG-TS signal and the program such as video, the audio stream key element that forms program.This table information is called as PSI (Program Specific Information: program certain detail information).PCR replaces the TS table information (PSI) that multiplex electronics 78 references comprise respectively from the MPEG-TS signal of two broadcast receiver systems inputs again, to the processing that unitizes of identical table information, will stipulate that MPEG-TS signals of these table information are compiled into a MPEG-TS signal each other again.

Then action is described.

Fig. 7 is the flow chart that represents the action of the related digital broadcasting transmitter of execution mode 3, elaborates from the MPEG-TS signal of two systems being input to TS processing department 7B and starts till export the processing of network I/F portion 8 to according to this figure.

First, DeMux separating treatment circuit 71b is to separating (step ST1b) from the MPEG-TS signal of channel decoder 6 and channel decoder 6a input respectively.Then, DeMux separating treatment circuit 71b judges whether the TS packet of these MPEG-TS signals is PCR packet (step ST2b).

In the situation that TS packet is PCR packet (step ST2b: be), DeMux separating treatment circuit 71b exports the PCR value of PCR packet to PLL circuit 74.PLL circuit 74 uses from the PCR value of DeMux separating treatment circuit 71b input and carries out PLL, reproduces the system clock (reproducing the required reference clock of MPEG-TS signal) (step ST3b) of 27MHz.

In the situation that TS packet is not PCR packet (step ST2b: no), DeMux separating treatment circuit 71b detects respectively its TS transfer rate according to the MPEG-TS signal of two systems, and these MPEG-TS signals are temporarily stored in buffer 72.Export the transfer rate of the TS signal that utilizes DeMux separating treatment circuit 71b to detect to read control circuit 75.

The testing circuit 82 of network I/F portion 8 is grasped and is used which time time slot (moment) by MOST protocol conversion circuitry 81, determines the time slot allocation situation of MOST network 1, and exports read control circuit 75 to.

Testing circuit 82 for example judges according to the time slot allocation situation of MOST network 1 whether MPEG-TS signal has the enough transmission bands that can export.

Then, read control circuit 75 judges whether to have inputted MPEG-TS signal (step ST4b), afterwards, and the time slot allocation condition information based on inputting from testing circuit 82, the time slot allocation situation (step ST5b) of confirmation MOST network 1.

Herein, use while thering is no enough transmission bands in MOST time slot, current MOST network 1 when being judged as other equipment 4, read control circuit 75 is judged to be the output holding state (step ST5b: no) in TS packet, does not read TS packet from buffer 72.MOST protocol conversion circuitry 81 is expanded the request (step ST10b) that distributes number of time slots to administrative unit 3, temporarily store MPEG-TS signal in buffer 72 (step ST11b).

On the other hand, exist enough transmission bands (according to above-mentioned request being judged as in current MOST network 1, time slot is assigned to the situation of administrative unit 3 etc.), read control circuit 75 is judged to be the not output holding state in TS packet (step ST5b: be).

In the case of the TS transfer rate of MPEG-TS signal than MOST network average " vacant " rate want little, read control circuit 75 is obtained the maximum transfer rate that is assigned to the MPEG-TS signal that in testing circuit 82, detection obtains, and controller buffer 72, average MOST network " vacant " maximum transfer rate below rate and that be dispensed to this MPEG-TS signal is set as exporting transfer rate, read TS packet with this output transfer rate, and export PCR replacement TS multiplex electronics 78 again to.

In addition, in the case of the transfer rate of MPEG-TS signal be MOST network average " vacant " more than rate, after the time slot allocation expansion request carried out in MOST protocol conversion circuitry 81 is licensed, read control circuit 75 controller buffers 72, read out TS packet, and export PCR replacement TS multiplex electronics 78 again to.

PCR replacement TS again multiplex electronics 78 judges whether the TS packet reading from buffer 72 is as described above PCR packet (step ST6b).

MPEG-TS signal (TS packet) in output is (step ST6b: be) PCR packet, and PCR replacement TS again multiplex electronics 78 will rewrite into PCR packet (replacement of PCR value) (step ST9b) from PCR value PLL circuit 74, that use in the reproduction of system clock.

MPEG-TS signal (TS packet) in output is not (step ST6b: no) PCR packet, or the PCR value of being reproduced by PLL circuit 74 in step ST8b is rewritten PCR packet, if the content of the table information comprising from the MPEG-TS signal of two broadcast receiver system inputs is respectively identical, PCR replace TS again multiplex electronics 78 the table information of these MPEG-TS signals is unified into a table information, and MPEG-TS signal is compiled into a MPEG-TS signal (TS is multiplexed again) (step ST7b) each other again.

PCR replace TS again the MPEG-TS signal of multiplex electronics 78 after TS is multiplexed again export network I/F portion 8 (step ST8b) to.In addition,, if the content of table information is not identical, MPEG-TS signal is directly exported to network I/F portion 8.

Then, MOST protocol conversion circuitry 81 converts MOST agreement to by replace the TS TS signal that multiplex electronics 78 is inputted again from PCR, and exports MOST network 1 to.In addition, for this TS signal, adjusted in time the time of delay producing in buffer 72 because PCR value is replaced rear being temporarily stored in, therefore can be realized the asynchronous transmission of time of delay.

As mentioned above, according to present embodiment 3, possess multiple broadcast receiver systems, comprise that PCR replaces TS multiplex electronics 78 again, for MPEG-TS signal from the MPEG-TS signal of multiple broadcast receiver systems input, that there is shared information table information such as () PSI respectively, this shared information is unified into one by this PCR replacement TS again multiplex electronics 78, and the MPEG-TS signal with shared information is compiled into a stream again.By said structure, by being unified into shared information from the MPEG-TS signal of multiple broadcast receiver system inputs respectively, be again multiplexed into MPEG-TS signal, thus, can reduce and reproduce the required transfer rate of multiple programs.

In addition, the present invention can carry out independent assortment to each execution mode in this scope of invention, or the arbitrary structures key element of each execution mode is out of shape or in each execution mode, is omitted structural element arbitrarily.

Industrial practicality

Digital broadcasting transmitter involved in the present invention can export the video/audio data of the broadcast singal receiving to network in the mode of numerical data, make to utilize the reproducer being connected with loop network suitably to reproduce video/audio data, be therefore applicable to the vehicle mounted digital broadcasting transmitter being connected with in-vehicle networks such as MOST.

Label declaration

1 loop network (MOST network), 2,2A, 2B digital broadcasting transmitter, 3 administrative units, 4 other equipment, 5,5a tuner, 6,6a channel decoder, 7,7A, 7B TS processing department, 8,8A network I/F portion, 71,71a, 71b DeMux separating treatment circuit, 72 buffers, 73PCR replacement circuit, 74PLL circuit, 75 read control circuits, 76 data-signal buffers, 77 carousel decision circuits, 78PCR replace TS multiplex electronics, 81 again, 81a MOST protocol conversion circuitry, 82 testing circuits, 83MOST command analysis circuit.

Claims

1. a digital broadcasting transmitter, comprise broadcast receiver system, this broadcast receiver system by by via antenna reception to broadcast wave convert the tuner of intermediate frequency signal to and the channel decoder that described intermediate frequency signal converts numerical data to formed, this digital broadcasting transmitter is connected with the loop network that utilizes administrative unit to manage the distribution of number of time slots, it is characterized in that, comprising:

Buffer, this buffer stores is utilized the packet of the digit data stream that described channel decoder is converted to by described intermediate frequency signal;

Testing circuit, this testing circuit detects the maximum transfer rate of described loop network, the information of maximum transfer rate and the time slot allocation situation of described loop network that expression is dispensed to described digit data stream;

PLL circuit, this PLL circuit carrys out playback system clock according to the PCR value of described packet;

Read control circuit, in the time slot allocation situation based on detected the described loop network obtaining by described testing circuit, the time slot that is judged to be this loop network has in the situation of the time slot allocation more than maximum transfer rate that is dispensed to described digit data stream, the maximum transfer rate of described read control circuit based on described loop network and expression are dispensed to the information of the maximum transfer rate of described digit data stream, mode with the output transfer rate that reaches described digit data stream reads out packet from described buffer, and in the time that the transfer rate of described loop network is less than the output transfer rate of described digit data stream, described read control circuit is expanded the request that distributes number of time slots to described administrative unit, after having expanded distribution number of time slots, from described buffer read data packet,

PCR replacement circuit, comprises PCR at the packet reading from described buffer, and this PCR replacement circuit replaces to this PCR from the corresponding PCR value of described system clock of described PLL circuit input; And

Protocol conversion circuitry, this protocol conversion circuitry receives from the packet of described PCR replacement circuit output, and sets it as the digit data stream of the agreement that converts described loop network to and export this loop network to.

2. digital broadcasting transmitter as claimed in claim 1, is characterized in that, comprising:

Separating treatment circuit, this separating treatment circuit from the digit data stream that utilizes described channel decoder and be converted to by described intermediate frequency signal, the packet that separation is relevant to video and voice data and the packet of other data;

Decision circuit, this decision circuit separates from described separating treatment circuit the data that described other data that obtain, carousel transmission is carried out in judgement;

Data-signal buffer part, this data-signal buffer part is stored the packet that is judged to be the data of carrying out carousel transmission by described decision circuit in the mode corresponding with other data categories; And

Command analysis circuit, this command analysis circuit is resolved the command context receiving via described loop network, from data sending request equipment, specific data classification being connected with described carousel network in command context, read out the packet of the data corresponding with this data sending request from described data-signal buffer, and export described protocol conversion circuitry to

Described protocol conversion circuitry receives the packet being read from described data-signal buffer by described command analysis circuit, and the digit data stream setting it as after the agreement that converts described loop network to exports this loop network to.

3. digital broadcasting transmitter as claimed in claim 1 or 2, is characterized in that,

Possess multiple described broadcast receiver systems,

Comprise that stream works out handling part again, for digit data stream the digit data stream of inputting from multiple described broadcast receiver systems respectively, that there is shared information, this stream is worked out handling part again this shared information is unified into one, and the digit data stream with described shared information is compiled into a stream again.