CN103686215A - Grouping sending and receiving device and descramble system - Google Patents
Grouping sending and receiving device and descramble system Download PDFInfo
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/44004—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
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Abstract
The present invention relates to a grouping sending and receiving device and a descramble system. When TS grouping is sent and received by a transmission path for generating jitter, the TS grouping is outputted to the transmission path without adding a timestamp, thereby removing the influence of the jitter. In the present invention, a sending part and a receiving part are arranged, and the sending part comprises a demodulation part which outputs a TS grouping signal composed of the TS grouping obtained by a demodulation broadcast signal, a TS synchronizing signal representing the start of the TS grouping, a TS validity signal representing the validity of the TS grouping and a TS clock; and a grouping sending part which sends the TS grouping to a specific processing unit for specific processing via the transmission path. The receiving part comprises a grouping receiving part which receives the TS grouping processed by the specific processing unit via the transmission path, a reception buffer part which temporarily stores the received TS grouping, and a reception buffer reading control part which reads the TS grouping from the reception buffer part at the timing which is synchronous with the TS synchronizing signal inputted from the demodulation part.
Description
Technical field
The present invention relates to send and receive MPEG2-TS(Transport Stream via transmission path: the transport stream) block transmit-receiving device of grouping.
Background technology
In digital broadcasting, as for video, audio frequency are carried out to multiplexing data mode, adopted MPEG2-TS grouping.In this MPEG2-TS grouping (following, to be called TS grouping), for the clock of reproducing broadcast platform side in digital broadcasting transmitter, be attached with PCR(Program Clock Reference: program clock reference).Voltage controlled crystal oscillator) and the STC(System Time Clock that this system clock is counted on the other hand, digital broadcasting transmitter is equipped with and can utilizes magnitude of voltage to control the VCXO(Voltage Controled Xtal Oscillator as the system clock frequency of the Action clock benchmark of decoder etc.:: system clock).
In digital broadcasting transmitter, difference value between the current PCR receiving and the last PCR receiving and the count value of the system clock that STC count down to are therebetween compared, control the frequency of oscillation of the VCXO of receiver, make in the situation that the system clock frequency of receiver side higher than the clock frequency of broadcasting station side, reduce the system clock frequency of receiver side, in the situation that the system clock frequency of receiver, lower than the clock frequency of transmitter side, improves the system clock frequency of receiver side.Like this, in digital broadcasting transmitter, there is the mechanism that the system clock of broadcasting station side and the system clock of receiver side are synchronizeed, can make the video of receiver, the decoding of audio frequency regularly with broadcasting station coding after video, the Timing Synchronization of audio frequency.
On the other hand, in the situation that divide into groups from broadcasting station to receiver transmission TS via the transmission path that produces shake (jitter), due to shake, the time interval of the TS grouping that receiver receives is different from the time interval of the TS grouping of just having sent from broadcasting station.Result produces following problem: it is different from the timing of broadcasting station expectation that receiver extracts the timing of PCR from TS grouping, and the system clock of broadcasting station side can not correctly be synchronizeed with the system clock of receiver side.In addition short rather than constant time during duration in the propagation delay time that, grouping arrives receiver side through transmission path.Its departure is called shake.
For such problem, in TS block transmit-receiving device in the past, taked following method: broadcasting station side and receiver side are added respectively to the structure that the 27MHz clock generating according to gps signal is provided, by broadcasting station side and receiver side TTS count section separately, this clock is counted and as TTS count value, in broadcasting station side, using TTS count value as timestamp, be additional to TS and divide into groups and output to transmission path.Thus, at receiver side, to transmit next TS packet memory to reception buffer from broadcasting station side, and, extract additional timestamp (TTS count value) in this TS grouping, the timestamp (TTS count value) counting out in the TTS count section of the timestamp that this is extracted (TTS count value) and receiver side compares, and controls from the timing (for example,, with reference to patent documentation 1) of reception buffer output TS grouping.
Patent documentation 1: TOHKEMY 2009-33326 communique (0013rd～0016 section, Fig. 1)
But, in TS block transmit-receiving device in the past, need to carry respectively the structure that the 27MHz clock generating according to gps signal is provided in broadcasting station side and receiver side; Due to the TS grouping additional period stamp that need to send broadcasting station side, thereby broadcasting station side needs timestamp extra cell; Due to the TS grouping that need to receive from receiver side extraction time stamp and the timestamp that counts out of the TTS count section of the timestamp that this is extracted and receiver side compare, thereby receiver side needs timestamp extraction comparison unit, therefore the problem that, exists device to complicate.
Summary of the invention
The present invention is just in order to have addressed the above problem, obtain a kind of block transmit-receiving device simple in structure, when the transmission path via producing shake sends reception TS grouping, can be not to output to transmission path TS grouping additional period stamp output to transmission path, remove the impact of the shake producing in transmission path.
Block transmit-receiving device of the present invention is characterised in that, this block transmit-receiving device is provided with transmitting element and receiving element, described transmitting element has: demodulation section, the TS grouping that its output is obtained by demodulation broadcast singal, the initial TS synchronizing signal that represents TS grouping, the TS packet signal that represents to divide into groups TS effective TS useful signal and TS clock form; And grouping sending part, it passes out to the particular processor unit of carrying out particular procedure via transmission path by the described TS grouping from described demodulation section output, described receiving element has: grouping acceptance division, and its TS receiving after being processed by described particular processor unit via described transmission path divides into groups; Receive buffer part, the described TS that its temporary transient storage is received by described grouping acceptance division divides into groups; And reception buffering reads control part, it generates and the timing signal of synchronizeing from the described TS synchronizing signal of described demodulation section input, in the situation that more than in described reception buffer part there is predetermined data volume in the TS of temporary transient storage grouping, to described reception buffer part, export described timing signal, synchronously from described reception buffer part, read described TS grouping with described TS synchronizing signal.
The present invention is in the block transmit-receiving device of the transmission path via generation shake, can utilize simple structure to remove the impact of the shake producing in transmission path, broadcasting station side and receiver side no longer need respectively to provide the structure of the clock generating according to gps signal, the unit of TS grouping additional period stamp that broadcasting station side is sent, the TS grouping that receives from receiver side extraction time stamp the unit that compares of the timestamp that counts out of the TTS count section of the timestamp that this is extracted and receiver side.
Accompanying drawing explanation
Fig. 1 is the block diagram that the block transmit-receiving device of embodiments of the present invention 1 and the structure of descrambling system are shown.
Fig. 2 is the figure that the TS packet signal form of embodiments of the present invention 1 is shown.
Fig. 3 is that the reception buffering that embodiments of the present invention 1 are shown reads the flow chart of the action of control part.
Fig. 4 is the key diagram of the impact of the removal shake in explanation embodiments of the present invention 1.
Fig. 5 is that the reception buffering that embodiments of the present invention 2 are shown reads the flow chart of the action of control part.
Fig. 6 is the figure that the differentiation that time of the TS data volume of temporary transient storage in the reception buffer part of embodiments of the present invention 2 changes is shown.
Label declaration
11:RF input signal, 12:RF signal, 13:TS clock cable, 14:TS synchronous signal line, 100: block transmit-receiving device, 101: sending part, 102: tuner, 103: demodulation section, 104: send buffer part, 105: grouping sending part, 106: acceptance division, 107: grouping acceptance division, 108: receive buffer part, 109: receive buffering and read control part, 110: transmission path, 120: descrambler, 121: grouping acceptance division, 122: receive buffer part, 123: limit receiver module portion, 124: send buffer part, 125: grouping sending part, 130:B/E portion, 131:PCR recovery section, 132:Demux portion, 133: lsb decoder.
Embodiment
Execution mode 1
Fig. 1 is the block diagram illustrating the system configuration when implementing the block transmit-receiving device of embodiments of the present invention 1 and be applied to descrambling system.Descrambling system in present embodiment consists of block transmit-receiving device 100, descrambler 120 and B/E portion (rearward end) 130.Block transmit-receiving device 100 and the USB(Universal Serial Bus of descrambler 120 by generation shake: transmission path 110 USB) is connected.The transmission mode of this transmission path is for example the synchronous transfer module that can override carries out transmitted in packets.In addition,, except USB, transmission path 110 can be also the wire/radio networks such as IEEE1394, Ethernet (registered trade mark), WLAN (wireless local area network).
Block transmit-receiving device 100 forms by the sending part 101 as transmitting element with as the acceptance division 106 of receiving element.Sending part 101 consists of tuner 102, demodulation section 103, transmission buffer part 104 and grouping sending part 105.Acceptance division 106 reads control part 109 by grouping acceptance division 107, reception buffer part 108 and reception buffering and forms.
As the descrambler 120 of particular processor unit that carries out particular procedure by grouping acceptance division 121, receive buffer part 122, limit receiver module portion 123, send buffer part 124 and the sending part 125 that divides into groups forms.
(recovery) portion 131 is recovered by Demux portion 132, PCR by B/E portion 130 and lsb decoder 133 forms.
Next, the action of the descrambling system in present embodiment is described.
Tuning portion 102, when receiving RF input signal 11, carries out tuningly according to this RF input signal 11, and the RF signal 12 of expectation is transferred to demodulation section 103.103 pairs of RF signals of demodulation section 12 carry out demodulation and export TS grouping.Fig. 2 is the signal form of the TS grouping used in present embodiment.As shown in Figure 2, the grouping of the TS in present embodiment is transmitted with the various signal forms of TS grouping, TS synchronizing signal, TS useful signal, TS clock.The TS that with the TS grouping of this form transmission is the transmission location that represented by TS_A, TS_F, TS_C, TS_D in Fig. 1 divides into groups.But in the transmission location being represented by TS_A, TS_F, TS clock cable 13 is described with the different line of TS synchronous signal line 14 use.The TS clock cable 13 of the transmission location for example, being represented by TS_A is to output to transmission buffer part 104, receive buffer part 108, receive the holding wire that buffering reads control part 109 and Demux portion 132 from demodulation section 103.
As shown in Figure 2, in TS data, the TS that 1 grouping is aggregated into 188 bytes divides into groups, and TS useful signal is that the valid period of TS grouping is expressed as to high signal.In addition, TS synchronizing signal is to be the signal of effective (height) by the positional representation that represents the start byte of TS grouping.In addition, TS clock is TS transmission clock, is the signal comprising between TS grouping dynamic stage at interior constant frequency.Therefore,, the in the situation that of existing TS to divide into groups between dynamic stage in TS useful signal, the frequency of TS clock is the slightly high frequency of data rate (TS packet rates) than TS data.TS data can be the parallel data of 8 bits or the serial data of 1 bit.In addition the modulation parameter that, the TS data rate of demodulation section 103 outputs, TS clock frequency receive signal according to each is steady state value.
From the TS grouping of demodulation section 103 outputs, carried out scrambling, for it is carried out to descrambling, need to the 123 transmission TS of restriction receiver module portion in descrambler 120, be divided into groups via transmission path 110.In order to be divided into groups by the TS after scrambling to transmission path 110 outputs, sending part 101 moves as follows.
Send this TS after by scrambling of the temporary transient storage of buffer part 104 and divide into groups, by TS transmitted in packets of this temporary transient storage, give grouping sending part 105.Grouping sending part 105 confirms to send the data that temporarily store 1 data unit quantity will exporting to transmission path 110 in buffer part 104, to the data (TS_B) of 1 data unit of transmission path 110 outputs.At this, the data of 1 data unit (TS_B) are different from TS grouping unit, for example, be, in order to improve the average transmission efficiency on transmission path, a plurality of TS groupings of thousands of byte unit are set as to such data unit.
Transmission path 110 is USB, for example, with synchronous transfer module, transmit.The TS_B that is output to transmission path 110 is temporarily stored via the grouping acceptance division 121 in descrambler 120 and receives buffer part 122, and TS_C is outputed to the receiver module portion 123 that limits from this reception buffer part 122.In limiting receiver module portion 123, TS_C is carried out to descrambling, the TS_D after being descrambled is temporarily stored and sends buffer part 124.Now, the transfer clock frequency of TS_C, TS_D is the frequency slightly higher than TS clock frequency of supposition.By the TS_D that sends buffer part 124 temporary transient storages, via transmission paths 110 such as grouping sending part 125, USB, be output to block transmit-receiving device 100(TS_E).Unit of transfer on this transmission path 110 is not TS grouping unit, but transfer of data unit on transmission path 110.At this, while transmitting on transmission path 110, due to the impact of being shaken, thereby the TS class interval in TS_B, TS_C, TS_D and TS_E is different from the TS class interval in TS_A.
The TS_E being output to after being descrambled of transmission path 110 is imported into the grouping acceptance division 107 in block transmit-receiving device 100, temporarily stores into and receives buffer part 108.Receive buffer part 108 and read timing signal according to the TS grouping of reading control part 109 receptions from receiving buffering, export 1 TS grouping.At this, it is the signal of synchronizeing with the TS synchronizing signal from demodulation section 103 that timing signal is read in this TS grouping.Reception buffering reads control part 109 and controls the timing of reading TS grouping from receiving buffer part 108, to remove the impact of shake.Next, to receiving buffering, read TS grouping in control part 109 and read to control to process and describe.
Fig. 3 is that the reception buffering that present embodiment is shown reads the flow chart of the action of control part 109.
First, reception buffering reads control part 109 and confirms in reception buffer part 108, whether temporary transient TS data volume (amount of bytes) of storing exists predetermined the 1st data volume above (S301).
At this, the 1st data volume is the data volume that can should temporarily store from receiving the bottom line of buffer part 108 output TS data, for example, be 188 bytes of 1 TS block length.Or, in order to reduce buffer delay, more than the 1st data volume also can be made as 1 byte.In the situation that not there are not the 1st more than data volume data, receive buffering and read that control part 109 is waited in S301 until this condition is set up, after setting up, this condition proceeds to S302.
Next, receiving buffering reads control part 109 and waits for from the TS synchronizing signal of demodulation section 103 outputs and become effectively (height) (S302).Receive buffering and read control part 109 after TS synchronizing signal being detected and becoming effectively, to receiving buffer part 108 notice TS groupings, read timing signal, read timing signal with TS grouping and synchronously from receiving buffer part 108, read 1 TS grouping (S303).1 TS grouping, TS synchronizing signal and TS useful signal are controlled so as to TS synchronizing signal the start byte of the TS grouping of reading from reception buffer part 108 to be become effectively, and sends to B/E portion 130 with the TS data of the form shown in Fig. 2.Receive buffering and read control part 109 reading 1 TS grouping finishes from receiving buffer part 108, return to the time-controlled step (S301) that reads next TS grouping.
By reading like this control, from receiving buffer part 108 to the interval initial divide into groups to next TS initial of certain TS grouping of B/E portion 130 outputs, identical with the interval of TS synchronizing signal from demodulation section 103, therefore, can remove the impact of the shake producing in transmission path 110 grades.
The TS data (TS_F) that are imported into B/E portion 130 are imported into Demux portion 132, extract PCR.The PCR being extracted by Demux portion 132 is sent to PCR recovery section 131.PCR recovery section 131, according to the PCR receiving from Demux portion 132, generate the clock of synchronizeing with the system clock of broadcasting station side, and the system clock using this clock as B/E portion 130 outputs to lsb decoder 133.Demux portion 132 isolates video flowing and audio stream and outputs to lsb decoder 133 from TS grouping.Lsb decoder 133 is according to video flowing and audio stream from 132 inputs of Demux portion, with system clock synchronously output video and audio frequency.
Fig. 4 is the key diagram that the impact of the shake in present embodiment is removed in explanation.In Fig. 4, TS_A is the TS signal from demodulation section, TS_E is the TS signal from transmission path 110, wherein, transmission path 110 is the TS by after descrambler descrambling to be input to the position of block transmit-receiving device 100, TS_F outputs to the TS signal of B/E portion 130 from block transmit-receiving device 100, Fig. 4 illustrates respectively TS data and TS synchronizing signal.In TS_E, there is not TS synchronizing signal, thereby TS synchronizing signal is not shown.
The TS data (TS_E) from transmission path 110 inputs, not only the interval between the TS grouping of the interval between its TS grouping initial and TS data (TS_A) from demodulation section 103 outputs initial is different, and this interval is because the impact of the shake of generation in transmission path 110 has deviation.On the other hand, by receiving buffering, read the TS data (TS_F) that 109 pairs of control parts are output to Demux portion 132 and carry out timing controlled, since making, from the TS synchronizing signal of the TS_A of demodulation section, from receiving buffer part 108, read 1 TS grouping for triggering.Consequently, the interval between the TS of TS_F grouping initial and reception TS(TS_A from demodulation section 103) TS divide into groups initial between interval become same intervals.In addition, TS_F is controlled so as to the TS synchronizing signal from demodulation section 103 synchronously from receiving buffer part 108 output TS groupings, therefore, the time span of TS grouping is the interval between the PCR comprising in TS grouping, consistent with the interval between the PCR comprising the TS data (TS_A) of exporting from demodulation section 103.
As mentioned above, according to the block transmit-receiving device 100 of present embodiment, via the TS grouping of the transmission path 110 of the impact of being shaken, be temporarily stored and receive buffer part 108, reception buffering reads control part 109 and carries out timing controlled, make in the initial timing from demodulation section 103 output TS groupings, from receiving buffer part 108 output TS groupings.Consequently, the interval of the original position of the TS grouping of exporting from block transmit-receiving device 100 is identical with the interval of the original position that the TS that the TS grouping by demodulation section 103 demodulation is broadcasting station side transmission divides into groups, and can remove the impact of the shake of generation on transmission path 110.
In addition, the TS synchronizing signal of the TS grouping of use after by demodulation section 103 demodulation reads TS and divides into groups from receiving buffer part 108, thereby can make from the output of each data of the TS grouping of block transmit-receiving device 100 outputs regularly and from the output Timing Synchronization of each data of the TS grouping of demodulation section 103 outputs.
In addition, the PCR recovery section 131 of B/E portion 130 is extracted PCR from TS grouping, generates the clock (PCR recovery) of synchronizeing with the system clock of broadcasting station side.In this case, its PCR field is present in the start-up phase of TS grouping and compares slightly rearward position.Therefore, can envision, allow to the initial timing of dividing into groups at the timing output TS identical with broadcasting station side, if from different from the TS transfer clock frequency of demodulation section 103 output TS transfer clocks, from TS grouping is initial, till send the required transmission time of PCR, also difference can be produced, PCR recovery can not be strictly correctly carried out.
In order to tackle this point, by being that TS transmit clock signal is made as the signal with TS clock signal synchronization from demodulation section 103 outputs by reading from receiving the clock signal of the TS grouping of buffer part 108 outputs, even can make PCR position also synchronize with broadcasting station side completely.
In addition, in the present embodiment, to the TS form of TS grouping for new additional period stamp and change output that do not divide into groups, thereby do not need timestamp to process that required timestamp adjunct circuit, timestamp extract circuit, timestamp is removed circuit, system clock counter etc.
In addition, need to not obtain the synchronous of system clock for the transmitter side at transmission path 110 and receiver side, at sending part 101, descrambler 120, acceptance division 106, the clock synchronization circuit based on GPS reception & disposal is set respectively.Or except not needing to use GPS reception & disposal, also need to not carry PCR restore circuits at sending part 101 and not generate the system clock of synchronizeing with broadcasting station, make thus system clock counter works and to TS grouping additional period stamp.In addition, need to not carry at descrambler 120 removal circuit and the system clock counter of extraction time stamp.And in the situation that the such structure of needs, the system clock of descrambler 120 is by generating with the nonsynchronous quartz (controlled) oscillator of transmitter side, therefore, need termly the processing from sending part 101 corrective system clock counters.
Like this, according to the block transmit-receiving device 100 of present embodiment, can utilize simple structure to remove the impact of the shake producing in transmission path, broadcasting station side and receiver side no longer need respectively to provide the structure of the clock generating according to gps signal, the unit of TS grouping additional period stamp that broadcasting station side is sent, the TS grouping that receives from receiver side extraction time stamp the unit that compares of the timestamp that counts out of the TTS count section of the timestamp that this is extracted and receiver side.
In addition, the restriction receiver module portion 123 of present embodiment can not receive the special TS grouping that is attached with timestamp, and therefore, it is suitable can directly using the TS transmission means of the present embodiment of the TS receiving.
In addition, in the present embodiment, with USB, form transmission path 110, and use the synchronous transfer module that can override carries out transmitted in packets that its transmission mode has been described, but, not necessarily need to transmit with synchronous transfer module, can be also block transfer mode.
Execution mode 2
Block transmit-receiving device 100 in the descrambling system of the structure of the block transmit-receiving device of embodiments of the present invention 2 and the execution mode 1 shown in Fig. 1 is identical, but reception buffering reads control part 109 and reads the control method difference of TS data from receiving buffer part 108.The control of reading control part 109 according to the reception buffering of execution mode 1, from block transmit-receiving device 100, output to the TS(TS_F of B/E portion 130) data rate and from the reception TS(TS_A of demodulation section 103 output) data rate identical, the impact of the shake producing in transmission path is completely removed.Therefore, the mean data rate that is imported into the mean data rate of the TS grouping that receives buffer part 108 and the TS grouping of output is identical, and under normal condition, the TS data volume receiving in buffer part 108 is constant on average.
At this, due to some interference or the fault on transmission path, the input data rate of the TS grouping of sometimes inputting from transmission path 110 is temporarily higher than the output data rate dividing into groups from receiving the TS of buffer part 108 outputs.Under these circumstances, as mentioned above, from receiving the output data rate of the TS grouping of buffer part 108 outputs, be controlled so as to identical with the data rate of TS_A, thereby increase and reach in the situation of overflowing region when receiving the TS data volume (buffering grade) of temporary transient storage in buffer part 108, cause producing the precarious position of losing etc. and continuing always from receiving the data of buffer part 108 outputs.
The reception buffering of present embodiment reads control part 109 and appends following processing: detect such abnormality, the buffering grade that receives buffer part 108 is returned to safe class.Reception in the present embodiment buffering that illustrates Fig. 5 reads control part 109 reads TS grouping TS grouping from receiving buffer part 108 and reads the handling process of control.
As the TS data level that receives the TS data volume of temporary transient storage in buffer part 108, definition the 1st data volume, predetermined the 2nd data volume, predetermined the 3rd data volume.The 1st data volume is identical with execution mode 1, is the data volume that can should temporarily store from receiving the bottom line of buffer part 108 output TS data.As described later, detecting while reaching this grade, receiving buffering and read control part 109 and TS synchronizing signal detected and become effectively and start from receiving the control of buffer part 108 output TS groupings.
The 2nd data volume is to approach for detection of the data volume that receives temporary transient storage in buffer part 108 data volume that becomes the danger classes of overflowing, and is the value slightly less than overflow data amount.For example, the 2nd data volume is set as to 80% of overflow data amount.As described later, detecting while reaching this grade, receive buffering and read control part 109 and control, making from receiving the data rate of buffer part 108 output TS is a little higher thanly from demodulation section 103, to receive TS(TS_A) the speed of data rate, to reduce to receive the buffering grade of buffer part 108.For example, in the situation that use TS clock from demodulation section 103 as read the clock that reads of TS grouping from receiving buffer part 108, with respect to the TS block length of 188 bytes, conventionally exist between the dynamic stage that cannot send TS grouping of 16 bytes or 20 bytes.In this case, from receiving the data rate of buffer part 108 output TS, be to receive TS(TS_A from demodulation section 103) approximately 1.08 times of (the 188+16)/188=of data rate or approximately 1.11 times of (188+20)/188=.
The 3rd data volume is made as the value identical or close with the 1st data volume.As described later, detecting while reaching this grade, receiving buffering and read control part 109 and control, making again with from demodulation section 103 to receive TS(TS_A from receiving the data rate of buffer part 108 output TS) data rate identical.
According to Fig. 5, illustrate that reception in present embodiment buffering reads control part 109 and from receiving buffer part 108, reads the TS grouping reading and control method thereof of TS grouping.
In block transmit-receiving device 100, when starting to receive RF input signal, TS data temporarily store into via transmission path 110 and receive buffer part 108.Receive buffering and read control part 109 and monitor that the TS data volume that receives temporary transient storage in buffer part 108 is whether the 1st more than data volume (S501), in the 1st data volume, above in the situation that, proceed to next step (S502).In next step, receive buffering and read control part 109 and monitor that the TS data volume that receives temporary transient storage in buffer part 108 is whether the 2nd more than data volume (S502).
In receiving buffer part 108, the TS data volume of temporary transient storage is not in the 2nd data volume above in the situation that (no in S502 in the situation that), in order to carry out the common processing of reading, receive buffering and read control part 109 and wait for from the TS synchronizing signal of demodulation section 103 outputs and become effectively (height) (S503).Receive buffering and read control part 109 after TS synchronizing signal being detected and becoming effectively, to the timing signal that reads that receives buffer part 108 notice TS groupings, and read timing signal with TS grouping and synchronously from receiving buffer part 108, read 1 TS grouping (S504).In the present embodiment, also same with execution mode 1, it is the signal of synchronizeing with the TS synchronizing signal from demodulation section 103 that timing signal is read in TS grouping.Receive buffering and read control part 109 reading 1 TS grouping finishes from receiving buffer part 108, return to the step (S501) of carrying out verification to receiving the TS data volume of buffer part 108.
When in the situation that in receiving buffer part 108 in S502 the TS data volume of temporary transient storage be the 2nd more than data volume (S502 is), in near the situation of the TS data volume of temporary transient storage temporarily storing into and overflowing, receive buffering and read control part 109 and proceed to the Recovery processing step (S505 and S506) when abnormal.
In S505, reading during from S503 and S504 common processed different, and the Recovery processing when abnormal receives buffering and reads control part 109 and implemented to have omitted the TS synchronizing signal of waiting for from demodulation section and become the processing that effectively (is equivalent to S503).That is,, in S505, reception buffering reads control part 109 not to be confirmed in the whether effective situation of TS synchronizing signal, directly from receiving buffer part 108, reads 1 TS grouping.Now, in order to reduce to receive the buffering grade of buffer part 108, receiving buffering reads control part 109 and will be set as a little higher thanly from demodulation section 103, receiving TS(TS_A from receiving the data rate of buffer part 108 output TS) the speed of data rate, from receiving buffer part 108, read 1 TS grouping.Now, with the frequency transmission that the TS clock with from demodulation section 103 outputs is identical, from receiving the TS of buffer part 108 outputs, divide into groups, during as from demodulation section 103 output TS data, between TS grouping and TS grouping, existence is not carried out TS transfer of data, but transmit continuously.Like this, reception buffer 108 becomes the less state of TS data volume of temporary transient storage from approaching the state overflowing.
Next, receiving buffering reads control part 109 and monitors whether receive in buffer part 108 the TS data volume of temporary transient storage returns to and be less than the 3rd data volume (S506).If receive the TS data volume of temporary transient storage in buffer part 108, do not return to and be less than the 3rd data volume (no in S506 in the situation that), receive buffering and read control part 109 and return to S505, from receiving buffer part 108, read 1 TS grouping.Like this, reception buffering reads control part 109 and repeatedly carries out such step S505 and step S506.Next, when in receiving buffer part 108, the TS data volume of temporary transient storage returns to and is less than the 3rd data volume (in the situation that of in S506 being), reception buffering reads control part 109 and returns to the step (S501) that the TS data volume to receiving in buffer part 108 is carried out verification.
The action of reading control part 109 with respect to above-mentioned reception buffering is described with accompanying drawing, and the time that receives the TS data volume of temporary transient storage in buffer part changes.Fig. 6 is the figure of the differentiation that changes the time of the TS data volume of temporary transient storage in the reception buffer part illustrating in present embodiment.The longitudinal axis of Fig. 6 is the TS data volume that receives temporary transient storage in buffer part 108, and transverse axis is the time.
First, reception buffering reads control part 109 and waits for, until the TS data of the 1st data volume temporarily store into, receives buffer part 108 (S601).When receiving buffering, read control part 109 and the TS data volume that receives temporary transient storage in buffer part 108 detected and reach the 1st data volume when above, start synchronously with 1 TS unit of being grouped into, from reception buffer part 108, to read with the TS synchronizing signal from demodulation section 103.Now, the reception TS(TS_A that the output data rate of the TS data of exporting from reception buffer part 108 is controlled so as to and exports from demodulation section 103) data rate is identical, therefore, as shown in S602, the TS data volume that receives temporary transient storage in buffer part 108 is steady state value (S602), and this state becomes the common state while receiving buffer part 108 normal.
Conventionally, the TS data volume that receives temporary transient storage in buffer part 108 should be with a certain amount of variation near the 1st data volume, but, sometimes produce to receive abnormal that TS data volume in buffer part 108 increases as shown in S603, such as the data rate from transmission path input TS, can increase or produce fault etc. because of some impact.If let alone the abnormality that the TS data volume in such reception buffer part 108 increases, block transmit-receiving device 100 likely moves abnormally, such as the TS data that read from reception buffer part 108, produces loss etc.In the present embodiment, such when abnormal when occurring, control packet transceiver 100, returns to common state when normal to can make to receive TS data volume in buffer part 108.
When the TS data volume that receives temporary transient storage in buffer part 108 being detected, increase and reach the 2nd data volume when above, reception buffering reads control part 109 and does not wait for that the TS synchronizing signal from demodulation section 103 becomes effectively, but will read timing signal, be made as all the time effectively, start from receiving buffer part 108, to read TS data (S604) with 1 TS unit of being grouped into., from the TS data that receive buffer part 108 outputs, from state is different conventionally, become the continuous wave output that deducts TS class interval therebetween, with the data rate slightly higher than common state, export.
Next, when in reception buffer part 108 being detected, the TS data volume of temporary transient storage is reduced to less than the 3rd data volume, reception buffering reads control part 109 and again starts synchronously with 1 TS unit of being grouped into, from reception buffer part 108, to read (S605) with the TS synchronizing signal from demodulation section 103.Thus, as shown in S605, the TS data volume that receives temporary transient storage in buffer part 108 becomes steady state value again, receives buffer part 108 and returns to common state.
As mentioned above, according to the block transmit-receiving device 100 of present embodiment, identical with execution mode 1, via the TS grouping of the transmission path 110 of the impact of being shaken, temporarily store into and receive buffer part 108, reception buffering reads control part 109 and carries out timing controlled, makes from receiving buffer part 108, to export TS grouping in the initial timing from demodulation section 103 output TS groupings.Consequently, the interval of the original position of the TS grouping of exporting from block transmit-receiving device 100 is identical with the interval of the original position that the TS that the TS grouping by demodulation section 103 demodulation is broadcasting station side transmission divides into groups, and can remove the impact of the shake of generation on transmission path 110.
In addition, according to the block transmit-receiving device 100 of present embodiment, receive buffering and read the TS data volume that control part 109 monitors temporary transient storage in reception buffer part 108 all the time, detect the situation that the data volume of temporarily storing in buffer part 108 reaches near the abnormality overflowing that receives that produces, be controlled to export than the slightly high data rate of data rate that conventionally reads TS data from receiving buffer part 108, thereby the buffering grade that receives buffer part 108 can be returned to the data volume of common state.
In addition, receiving buffering reads control part 109 and is occurring when abnormal when receiving data volume in buffer part 108 and return to common state, do not wait for that the TS synchronizing signal from demodulation section 103 becomes effectively, but output receives the TS grouping of temporary transient storage in buffer part 108, thereby can export continuously TS grouping, can export with the high data rate of TS data read data rate when common.
Conventionally, the TS data from demodulation section 103 output, during transmission TS grouping with do not transmit TS grouping during ratio be 188:16 or 188:20.The data rate of the TS data in the Recovery processing of abnormality (S505 of Fig. 5) is set to 1.08 times～1.11 times of data rate when common.During the common slightly high data rate transport TS data of the ratio with such, in receiving the B/E portion 130 of these TS data, can bring impact to PCR recovery section 131.For example, be created in the situation that cannot generate stable system clock in PCR recovery section 131.If cannot generate stable system clock, bring sticky feeling likely to user's audiovisual, such as the video from lsb decoder 133 outputs, produce block noise or video generation pause etc.But, because the data rate of the TS data in the Recovery processing of abnormality can be set for the data rate of common state and there is no speed difference (1.08～1.11 times) sharply, thereby can make the variation of system clock minimum and can not bring larger sticky feeling to user's audiovisual.
In addition, in the present embodiment, the 2nd data volume is set as to 80% of overflow data amount, still, also can, according to receive the temporary transient memory capacity of buffer part, the amount of jitter producing etc. in transmission path, suitably sets the 2nd data volume.
In addition, in the present embodiment, by the clock signal that reads TS grouping from reception buffer, be that TS transmitted in packets clock is made as from the TS clock signal of demodulation section 103 outputs, but, also may be controlled to by using its other slightly high clock signal of frequency ratio of TS clock, accelerate to read TS data from receiving buffer part.
In addition, by TS grouping being read to timing signal, be made as the signal with TS clock synchronous from demodulation section 103, even can make PCR position also synchronize with broadcasting station side completely.
Claims (4)
1. a block transmit-receiving device, is characterized in that,
This block transmit-receiving device is provided with transmitting element and receiving element,
Described transmitting element has:
Demodulation section, its output demodulation broadcast singal and the TS grouping, the initial TS synchronizing signal that represents TS grouping that obtain, represents TS divide into groups effective TS useful signal and TS clock; And
Grouping sending part, it passes out to the particular processor unit of carrying out particular procedure via transmission path by the described TS grouping from described demodulation section output,
Described receiving element has:
Grouping acceptance division, its TS receiving after being processed by described particular processor unit via described transmission path divides into groups,
Receive buffer part, the described TS that its temporary transient storage is received by described grouping acceptance division divides into groups; And
Receive buffering and read control part, it generates and the timing signal of synchronizeing from the described TS synchronizing signal of described demodulation section input, in the situation that the TS of temporary transient storage grouping exists the predetermined the 1st more than data volume in described reception buffer part, to described reception buffer part, export described timing signal, synchronously from described reception buffer part, read described TS grouping with described TS synchronizing signal.
2. block transmit-receiving device according to claim 1, is characterized in that,
Receive buffering and read the function that control part has the data volume that monitors the TS grouping that receives temporary transient storage in buffer part,
In the situation that the data volume of the TS of temporary transient storage grouping becomes the predetermined the 2nd more than data volume in described reception buffer part, reception buffering reads the timing signal that reads that control part is not waited for TS packet synchronization signal and TS is divided into groups and is made as all the time effectively, start to read the TS grouping of temporary transient storage in described reception buffer part
In the situation that the data volume of the TS of temporary transient storage grouping is less than the 3rd data volume in described reception buffer part, receive buffering and read control part according to the timing signal that reads of the described TS grouping of synchronizeing with described TS packet synchronization signal, the TS grouping of reading temporary transient storage in described reception buffer part, wherein said the 3rd data volume is less than described the 2nd data volume.
3. block transmit-receiving device according to claim 1, is characterized in that,
Receive buffering and read the function that control part has the data volume that monitors the TS grouping that receives temporary transient storage in buffer part,
In the situation that the data volume of the TS of temporary transient storage grouping becomes the predetermined the 2nd more than data volume in described reception buffer part, reception buffering reads the timing signal that reads that control part is not synchronizeed with TS synchronizing signal and TS is divided into groups and is made as all the time effectively, with the high signal of the speed of speed ratio TS clock signal synchronously, start to read the TS grouping of temporary transient storage in described reception buffer part
In the situation that the data volume of the TS of temporary transient storage grouping is less than the 3rd data volume in described reception buffer part, reception buffering reads control part and described TS clock signal synchronization and reads temporary transient TS grouping of storing in described reception buffer part, and wherein said the 3rd data volume is less than described the 2nd data volume.
4. a descrambling system, this descrambling system has block transmit-receiving device and descrambler, it is characterized in that,
Described block transmit-receiving device has transmitting element and receiving element,
Described transmitting element has:
Demodulation section, the TS grouping that its output is obtained by demodulation broadcast singal, the initial TS synchronizing signal that represents TS grouping, the TS packet signal that represents to divide into groups TS effective TS useful signal and TS clock form; And
Grouping sending part, it sends the described TS grouping from described demodulation section output,
Described receiving element has:
Grouping acceptance division, it receives the TS grouping of sending from described grouping sending part via transmission path;
Receive buffer part, the described TS that its temporary transient storage is received by described grouping acceptance division divides into groups; And
Receive buffering and read control part, it generates and the timing signal of synchronizeing from the described TS synchronizing signal of described demodulation section input, in the situation that the TS of temporary transient storage grouping exists the predetermined the 1st more than data volume in described reception buffer part, to described reception buffer part, export described timing signal, synchronously from described reception buffer part, read described TS grouping with described TS synchronizing signal
Described descrambler is connected with described block transmit-receiving device via described transmission path, the TS grouping sending from described block transmit-receiving device is implemented to scramble process, the TS grouping after descrambling is sent to described block transmit-receiving device via described transmission path.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPJP2012-210412 | 2012-09-25 | ||
| JP2012210412A JP6008108B2 (en) | 2012-09-25 | 2012-09-25 | Transceiver and descrambling system |
| JP2012-210412 | 2012-09-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103686215A true CN103686215A (en) | 2014-03-26 |
| CN103686215B CN103686215B (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310431957.7A Expired - Fee Related CN103686215B (en) | 2012-09-25 | 2013-09-22 | Grouping sending and receiving device and descramble system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6008108B2 (en) |
| CN (1) | CN103686215B (en) |
| DE (1) | DE102013219140B4 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104602036A (en) * | 2015-01-12 | 2015-05-06 | 深圳创维数字技术有限公司 | TS stream transmission method and related device |
| CN105306987A (en) * | 2015-10-23 | 2016-02-03 | 深圳国微技术有限公司 | Device for controlling output code rate of TS stream interface |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6831931B2 (en) | 2000-12-06 | 2004-12-14 | International Business Machines Corporation | System and method for remultiplexing of a filtered transport stream |
| JP2007074127A (en) * | 2005-09-05 | 2007-03-22 | Sanyo Electric Co Ltd | Television receiver |
| JP2009033326A (en) * | 2007-07-25 | 2009-02-12 | Hitachi Information & Communication Engineering Ltd | Packet transmitting device and method |
-
2012
- 2012-09-25 JP JP2012210412A patent/JP6008108B2/en not_active Expired - Fee Related
-
2013
- 2013-09-22 CN CN201310431957.7A patent/CN103686215B/en not_active Expired - Fee Related
- 2013-09-24 DE DE102013219140.5A patent/DE102013219140B4/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104602036A (en) * | 2015-01-12 | 2015-05-06 | 深圳创维数字技术有限公司 | TS stream transmission method and related device |
| CN105306987A (en) * | 2015-10-23 | 2016-02-03 | 深圳国微技术有限公司 | Device for controlling output code rate of TS stream interface |
| CN105306987B (en) * | 2015-10-23 | 2018-06-22 | 深圳国微技术有限公司 | A kind of device for controlling TS stream interface bit rate outputs |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103686215B (en) | 2017-02-22 |
| DE102013219140A1 (en) | 2014-03-27 |
| JP2014068095A (en) | 2014-04-17 |
| JP6008108B2 (en) | 2016-10-19 |
| DE102013219140B4 (en) | 2022-05-05 |
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