WO2005104540A1 - 受信装置とこの受信装置を使用した受信システムおよびその受信方法 - Google Patents
受信装置とこの受信装置を使用した受信システムおよびその受信方法 Download PDFInfo
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- WO2005104540A1 WO2005104540A1 PCT/JP2004/017155 JP2004017155W WO2005104540A1 WO 2005104540 A1 WO2005104540 A1 WO 2005104540A1 JP 2004017155 W JP2004017155 W JP 2004017155W WO 2005104540 A1 WO2005104540 A1 WO 2005104540A1
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 claims abstract description 45
- 230000000630 rising effect Effects 0.000 claims description 28
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 17
- 230000006837 decompression Effects 0.000 claims description 13
- 230000003111 delayed effect Effects 0.000 claims description 6
- 238000003708 edge detection Methods 0.000 claims description 3
- 230000001934 delay Effects 0.000 claims description 2
- 230000005236 sound signal Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
-
- 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
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
-
- 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
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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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
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4622—Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet
Definitions
- the present invention relates to a receiving apparatus, a receiving system using the receiving apparatus, and a receiving method thereof.
- the present invention relates to a receiver for receiving a plurality of digital broadcasts of different broadcast systems, such as satellite digital broadcasts and terrestrial digital broadcasts, or of the same broadcast system, a reception system using the receiver, and a reception method therefor. is there.
- a receiving apparatus and a receiving system that simultaneously receive a plurality of broadcasts include a plurality of demodulation units that perform demodulation according to each transmission scheme of a received signal, and multiplex and output demodulated data output by each demodulation unit.
- the multiplexing unit includes a multiplexing unit, a multiplexing data separating unit that separates and outputs demodulated data to be decoded from the multiplexed demodulating data, and a decoding unit that decodes and outputs the demodulated data separated by the multiplexing data separating unit.
- this known digital broadcast receiving apparatus includes a plurality of demodulation sections adapted to each broadcasting scheme, and demodulated data output from the plurality of demodulation sections in a transport packet unit.
- the multiplexing unit that multiplexes the transport packets at a rate equal to or higher than the total transport packet transmission rate of each broadcast system and the demodulated data to be decoded from the multiplexed demodulated data are output. It has a multiplex data separation unit.
- the demodulated data output from a plurality of demodulation units corresponding to each broadcasting system is transmitted to a known digital broadcast receiving apparatus by a transport packet unit.
- a transport packet unit In order to multiplex at a speed higher than the total packet transmission speed, each demodulated data
- a large-scale storage circuit such as a memory for delaying the operation is required, and the circuit scale is increased.
- the known digital broadcast receiving apparatus has not disclosed a method of multiplexing demodulated data specifically.
- the present invention provides an inexpensive receiving apparatus capable of multiplexing two demodulated data by adding a small circuit without using a large-scale memory, and a receiving system using the receiving apparatus. And a receiving method thereof.
- the present invention provides a receiving apparatus, which receives a received signal of each broadcasting system as input, and outputs demodulated data and a timing clock synchronized with the demodulated data, respectively.
- a clock generator that outputs the two timing clocks output from the A / D converter to the AV decoder as a high-speed timing clock and a low-speed timing clock, and outputs a control signal for multiplexing the two demodulated data output from the demodulation unit;
- the main feature is to have a multiplexing unit that multiplexes two demodulated data based on the control signal and outputs the multiplexed data to the AV decoder.
- the video Z audio signal of each broadcast is processed using the multiplexed data output from the receiving device and the timing clock as inputs.
- the above configuration makes it possible to multiplex two pieces of demodulated data by adding a small circuit without using a large-scale memory, thereby reducing cost and power consumption by reducing the circuit scale. Power consumption can be realized, and the timing clock synchronized with the multiplexed demodulated data can be synchronized with a single timing clock such as a high-speed timing clock or a higher-speed internal timing clock.
- This has the advantage that the timing constraints of (video signal processing device) can be relaxed and a cheaper system can be constructed.
- FIG. 1 is a configuration diagram of a receiving device according to a first embodiment of the present invention.
- FIG. 2 is a configuration diagram of a clock generation unit of the receiving device.
- FIG. 3 is a configuration diagram of a speed determination unit of the receiving device.
- FIG. 4 is a timing chart for explaining the operation of the receiving apparatus.
- FIG. 5 is a configuration diagram of a receiving device according to a second embodiment of the present invention.
- FIG. 6 is a configuration diagram of a clock generation unit of the receiving device.
- FIG. 7 is a configuration diagram of a multiplexing unit of the receiving device.
- FIG. 8 is a timing chart for explaining the operation of the receiving apparatus.
- FIG. 9 is a configuration diagram of a receiving device according to a third embodiment of the present invention.
- FIG. 10 is a timing chart for explaining the operation of the receiving apparatus.
- FIG. 11 is a configuration diagram of a receiving device according to a fourth embodiment of the present invention.
- FIG. 12 is a configuration diagram of a receiving device according to a fifth embodiment of the present invention.
- FIG. 13 is a flowchart of a receiving method of the receiving device.
- FIG. 1 is a configuration diagram of a receiving device according to Embodiment 1 of the present invention.
- reference numeral 100 denotes a receiving device.
- the receiving device 100 receives two reception signals A and B of digital broadcasts of different broadcast systems or the same broadcast system, and receives respective demodulated data. It outputs multiplexed data with multiplexed output, and high-speed and low-speed timing clocks synchronized with the multiplexed data.
- Reference numeral 107 denotes an AV decoder (an example of a video signal processing device).
- the AV decoder 107 receives the multiplexed data output from the receiving device 100, the high-speed timing clock, and the low-speed timing clock, and demodulates the multiplexed data into two signals. The data is separated and decoded, and one or both of the two demodulated data are used as received data and processed into video Z audio signals of each broadcast.
- the receiving apparatus 100 includes first and second demodulation units 101 and 102, a speed determination unit 105, a first selection unit 106, a clock generation unit 103, and a multiplexing unit 104. I have.
- the first and second demodulation units 101 and 102 receive the two received signals A and B, respectively, output the demodulated data Dl and D2 to the first selection unit 106, and synchronize with them.
- the timing clocks Tl and T2 are output to the first selector 106 and the speed determiner 105.
- the speed determination unit 105 receives two timing clocks Tl and T2 output from the demodulation units 101 and 102, respectively, and compares the speeds with each other. And outputs the result of the determination to the first selection unit 106 as a control signal C3.
- the first selecting unit 106 Based on the control signal C3 (judgment result) output from the speed judging unit 105, the first selecting unit 106 outputs the timing clocks Tl and T2 output from the first and second demodulating units 101 and 102. Is selected as the high-speed timing clock TH and output to the clock generation unit 103, and the other is output to the clock generation unit 103 as the low-speed timing clock TL, and further, the first and second demodulation units One of the demodulated data Dl and D2 output from 101 and 102 is selected as high-speed demodulated data DH and output to multiplexing section 104, and the other is output to multiplexing section 104 as low-speed demodulated data DL.
- the clock generation unit 103 receives the high-speed timing clock TH and the low-speed timing clock TL output from the first selection unit 106 as inputs (to the two timing clocks output from the demodulation units 101 and 102). ), And generates a timing clock of the multiplexed demodulated data DH and DL, that is, a high-speed timing clock of the high-speed demodulated data DH and a low-speed timing clock of the low-speed demodulated data DL.
- a control signal for multiplexing demodulated data DH and DL is output to multiplexing section 104.
- the multiplexing unit 104 multiplexes the demodulated data DH and DL output from the first selecting unit 106 on a byte basis based on the control signal output from the clock generating unit 103, and multiplexes the multiplexed data into the AV decoder 107. Output to
- first and second demodulation units 101 and 102 are demodulation units adapted to the broadcast system of each of the received signals A and B.
- FIG. 2 shows a more specific circuit configuration of the clock generation unit 103.
- the clock generation unit 103 receives the high-speed timing clock TH and the low-speed timing clock TL output from the first selection unit 106 as inputs, and as shown in FIG. It is output to the AV decoder 107 as a timing clock.
- the clock generation unit 103 includes a delay unit 201, an edge detection unit 202, a second selection unit 203, and a control signal generation unit 204.
- the delay unit 201 receives the low-speed timing clock TL, delays it, and outputs the delayed timing clock TLD to the second selection unit 203.
- the edge detection unit 202 includes a high-speed timing clock TH and a low-speed timing clock T
- a logical value "1" an example of a second logical value
- a logical value "0" an example of an inverted value of the second logical value
- the second selection unit 203 receives the low-speed timing clock TL and the timing clock TLD output from the delay unit 201, and selects two timing clocks based on the selection signal SL. When the logical value is “1”, the delayed timing clock TLD is selected, and when the logical value is “0”, the low-speed timing clock TL is selected. Output to the decoder 107.
- the control signal generation unit 204 receives the low-speed timing clock and the high-speed timing clock TH output from the second selection unit 203 and receives the low-speed timing clock TH and the high-speed timing clock TH as control signals for identifying demodulated data DH and DL selected by the multiplexing unit 104.
- the logical value “1” an example of a third logical value
- the logical value “0” third logical value
- FIG. 3 shows a more specific circuit configuration of the speed determination unit 105.
- the speed determination unit 105 includes first and second clock counting units 301 and 302, and an identification unit 303.
- the first and second clock counting units 301 and 302 receive the two timing clocks Tl and T2 output from the first and second demodulation units 101 and 102, respectively, and The number of clock rises of Tl and T2 (the number of clocks) Nl and N2 are counted, and (self) initialization signals are output to the identification unit 303 as control signals CI and C2 at a predetermined cycle n, respectively.
- One control signal (initialization signal) Initialized together by the output of CI and C2.
- the identification unit 303 receives the control signals CI and C2 output from the first and second clock counting units 301 and 302, respectively, as inputs, identifies a speed determination result, and outputs the result to the first selection unit 106.
- the control signal C1 is input as the signal (identification signal) C3 to the first selection unit 106 first or simultaneously, the signal “1” (an example of the first logical value) is output, and the control signal C2 is output first. If “0" is input, "0" (an example of the inverted value of the first logical value) is output.
- the count values Nl and N2 of the first and second clock counting units 301 and 302 are The control signals (initialization signals) CI and C2 are output.
- FIG. 4 is a timing chart of each unit in the receiving apparatus 100 of FIG.
- the first demodulation section 101 performs demodulation processing conforming to the broadcasting system, and performs processing on the timing clock T1 and the demodulated data D1 ( ⁇ [1], ⁇ [2], ⁇ [3],.
- the second demodulation unit 102 performs demodulation processing conforming to the broadcasting system, and outputs a timing clock # 2 and demodulated data 02 [1] [2] [3], '' synchronized therewith.
- the clock counting units 301 and 302 of the speed determination unit 105 count the rising of the timing clock Tl, # 2, and the count output Nl, # 2 increases as shown in FIG.
- a control signal (initialization signal) CI for initializing the clock counting units 301 and 302 when Nl, ⁇ 2 becomes equal to the period ⁇ (time 1 and time 2 in the figure).
- the identification unit 305 of the speed determination unit 105 determines which of the clock counting units 301 and 302 has reached the predetermined period ⁇ first, that is, which of the control signals CI and C2 has the logical value first. Depending on whether it has become "1", a high-speed clock is identified from the timing clocks Tl and # 2, and a control signal C3 indicating the result is output.
- the control signal C3 when the timing clock T1 is high-speed, that is, when the control signal C1 is input first or simultaneously, "1" is output, and the timing clock # 2 is high-speed, that is, when the control signal C2 is Outputs "0" when input first.
- the first selection unit 106 sets the timing locks Tl and ⁇ 2 to a high-speed timing clock ⁇ and a low-speed timing clock TL when the control signal C3 has the logical value “1”.
- the demodulated data Dl and D2 are output as the high-speed demodulated data DH and the low-speed demodulated data DL, respectively.
- the clock generator 103 outputs the inputted high-speed timing clock TH to the AV decoder 107 as it is as a high-speed timing clock.
- the delay unit 201 of the clock generation unit 103 outputs the timing clock TLD by delaying the low-speed timing clock TL.
- the edge detector 202 compares the timing clocks TH and TL. Then, as the selection signal SL, a logical value “1” is output when the rising edge is at the same time, and a logical value “0” is output when the rising edge is different.
- the second selection unit 203 selects the delayed timing clock TLD when the selection signal SL has the logical value “1”, and selects the timing clock TL when the selection signal SL has the logical value “0”. Output to AV decoder 107.
- the control signal generation unit 204 of the clock generation unit 103 outputs a logical value “1” as a control signal to be output to the multiplexing unit 104 when the high-speed timing clock rises, and outputs a logic value when the low-speed timing clock rises. Outputs the value "0" and keeps the value if there is no rising edge.
- Multiplexing section 104 selects high-speed demodulated data DH when the control signal output from control signal generating section 204 has a logical value "1", and selects low-speed demodulated data DL when the control signal has a logical value "0". As a result, as shown in FIG. 4, multiplexed data is generated from the demodulated data DH and DL and output to the AV decoder 107.
- the storage unit (large-scale memory) for storing the two demodulated data Dl and D2 output from the two demodulation units 101 and 102 can be used without using It is possible to multiplex the two demodulated data Dl and D2 with a small circuit follow-up circuit, and it is possible to reduce the circuit scale and cost by downsizing the receiving device 100. At the same time, multiplexed output can reduce costs by reducing the number of output pins and downsizing the receiver. Further, since the demodulated data is sequentially output without being stored in the memory or the like, it is possible to avoid the jitter performance from deteriorating and the response time from increasing.
- the speed determination unit 105 selects one of the timing clocks Tl and T2 output from the demodulation units 101 and 102 as the high-speed timing clock TH and outputs it. The other is output as the low-speed timing clock TL, and one of the demodulated data Dl and D2 output from the first and second demodulation units 101 and 102 is selected as the high-speed demodulated data DH.
- processing can be performed by one system of multiplexing unit 104 and clock generation unit 103, and the circuit scale can be reduced.
- the clock counting units 301 and 302 are used as the speed determination unit 105. This makes it possible to easily compare the timing clocks Tl and T2 with a small circuit.
- the timing clock TLD delayed by the delay unit 201 is selected as the low-speed timing clock, and the rising timing of the low-speed timing clock is determined.
- the two demodulated data Dl and D2 can be multiplexed without being missed, and the reliability can be improved.
- the jitter performance can be improved by making the predetermined period n variable according to the frequency of the clock timings Tl and T2, and the clock count can be improved by making the period n a power of two.
- the generation units of the initialization signals (control signals CI and C2) of the units 301 and 302 can be simplified, and the circuit size can be further reduced.
- the circuit can be further downsized by removing the speed determination unit 105 and the first selection unit 106. If the speeds of the timing clocks Tl and T2 can be identified by an external force, it is needless to say that the circuit can be downsized by removing only the speed judging unit 105.
- the polarity and the logical value of the control signal shown in the first embodiment are not limited to these.
- FIGS. 5 to 8 and FIG. The same components as those of the first embodiment shown in FIGS. 1 and 3 are denoted by the same reference numerals, and description thereof is omitted.
- a clock generation unit 501 is provided instead of the clock generation unit 103 of the first embodiment, and a multiplexing unit 503 is provided instead of the multiplexing unit 104.
- the clock generation unit 501 of the second embodiment receives the count values Nl, N2, the control signals (initialization signals) CI, C2, and the control signal (identification signal) C3 from the speed determination unit 105, and performs the first selection.
- Block 106 Inputs a higher-speed timing clock TH, outputs the higher-speed timing clock TH as a higher-speed timing clock, and outputs a clock synchronized with the higher-speed timing clock TH having the same average frequency as the other lower-speed timing clock TL. Generate and output as low-speed timing clock.
- the multiplexing unit 503 of the second embodiment receives the high-speed demodulation data DH, the low-speed demodulation data DL, and the low-speed timing clock TL from the first selection unit 106, and inputs the low-speed timing clock from the clock generation unit 501. Then, based on the input low-speed timing clock, high-speed demodulation data DH and low-speed demodulation data DL are selected to generate multiplexed data in byte units.
- FIG. 6 shows a specific circuit configuration of the clock generation unit 501.
- the clock generation unit 501 includes a third selection unit 601, a storage unit 602, a mask signal generation unit 603, a mask unit 604, and a logic inversion circuit 605. .
- the third selection unit 601 receives the count values Nl, N2 and the control signal C3 from the speed determination unit 105, and when the control signal C3 is a logical value “1”, that is, when the timing clock T1 is high-speed, The count value N1 of the first clock counting unit 301 is selected, and the count value N2 of the second clock counting unit 302 is selected when the control signal C3 is a logical value "0", that is, when the timing clock T2 is high speed.
- the count value NH is output to the mask signal generation unit 603.
- the storage unit 602 receives the count values Nl, N2, the control signals (initialization signals) CI, C2, and the control signal C3 from the speed determination unit 105, and receives the control signals (initialization signals) CI, C2.
- the control signal C3 has the logical value "1" (when the timing clock T1 is high-speed)
- the count value N2 output from the second clock counting unit 302 connected to the low-speed timing clock T2 Is stored as a control value M
- the control signal C3 is a logical value “0” (when the timing clock T2 is high speed)
- the numerical value N1 is stored as the control value M and output to the mask signal generation unit 603.
- the mask signal generation unit 603 receives the count value NH output from the third selection unit 601 and the control value M output from the storage unit 602 as inputs, and uses the count value of the third selection unit 601 as a mask signal. If NH is equal to or less than the control value M, "1" (an example of a fourth logical value) is output to the mask unit 604, and if the count value NH of the third selection unit 604 is larger than the control value M, "0" is output. “(An example of the inverted value of the fourth logical value) is output to the mask unit 604.
- the mask unit 604 receives the high-speed timing clock TH output from the first selection unit 106 and the mask signal output from the mask signal generation unit 603, and multiplexes with the AV decoder 107 as a low-speed timing clock. To the unit 503, a high-speed timing clock TH is output when the mask signal power is “1”, and a logical value “L” is output when the mask signal power is “0”. [0057]
- the logic inversion circuit 605 is a high-speed timing clock output from the first selection unit 106.
- TH is logically inverted and output to the AV decoder 107 as a high-speed timing clock.
- FIG. 7 shows a specific circuit configuration of the multiplexing section 503.
- the multiplexing unit 503 includes a FIFO unit 701, a fourth selecting unit 702,
- the FIFO unit 701 sequentially writes the low-speed demodulated data DL input from the first selection unit 106 at the timing of the low-speed timing clock TL input from the first selection unit 106, and the clock generation unit 501 The data is read at the timing of the output low-speed timing clock, and output to the fourth selection unit 702.
- the fourth selecting unit 702 selects the low-speed demodulated data DL output from the FIFO unit 701 and outputs the logical value “0”. In the case of "", multiplexed data is generated by selecting the high-speed demodulated data DH and output to the AV decoder 107.
- the storage unit 602 stores the count output N2 of the second clock counting unit 302 connected to the low-speed timing clock T2 when the count output N1 of the count unit 301 at time 1 or time 2 reaches the predetermined period n. Is stored in the storage unit 602 as the control value M. In the case of FIG. 8, m is stored. The storage unit 602 is updated in accordance with the control signal C1 (initialization timing) of the first clock counting unit 301.
- the count value N 1 of the first clock counting unit 301 connected to the high-speed timing clock T 1 is selected by the control signal C 3 and is output as the count value NH.
- the mask signal generation unit 603 compares the count value NH that changes in synchronization with the high-speed timing clock T1 output from the selection unit 601 with the control value M stored in the storage unit 602, and calculates the count value NH.
- a logical value "1” is output as a mask signal
- a logical value "0” is output.
- the logical value is "1" until the count value NH becomes m.
- the mask unit 604 outputs a high-speed timing clock TH when the mask signal is a logical value “1” and outputs a logical value “L” as a low-speed timing clock when the mask signal is a logical value “0”.
- the logic inversion circuit 605 logically inverts the high-speed timing clock TH to perform a high-speed timer. Output as an imming clock.
- the low-speed demodulated data DL is written into the FIFO unit 701 at the timing of the low-speed timing clock TL, and after a certain time delay, is read out at the timing of the low-speed timing clock, so that the output of the FIFO unit 701 is as shown in FIG. As shown, a number of bursts are output in synchronization with the control value M in synchronization with the low-speed timing clock.
- the fourth selection unit 702 selects the output of the FIFO unit 701 when the low-speed timing clock is a logical value “1”, and selects the high-speed demodulated data DH when the low-speed timing clock is a logical value “0”. Output.
- the two demodulation data DH and DL output from the two demodulation units 101 and 102 are synchronized with one timing clock synchronized with the high-speed timing clock. Since the timing of the multiplexed output is at equal intervals, signal processing for processing the multiplexed output is facilitated, and the configuration of the entire receiving device can be simplified. In addition, since the timing constraint of the AV decoder 107 at the subsequent stage can be relaxed, an inexpensive one can be used, and the whole receiving system can be provided at low cost.
- a low-speed timing clock having an average frequency equal to the low-speed timing clock can be generated by a small-scale circuit based on the high-speed timing clock.
- the speed can be determined and selected.
- the clock generation unit 501 stores the values Nl and N2 obtained by the speed determination unit 105, the control signals (initialization signals) CI and C2, and the control signal C3.
- the section 602 receives the force for obtaining the control value M.
- the first selection section 106 receives a higher-speed timing clock TH and a lower-speed timing clock TL than the first selection section 106, and initializes at the cycle n for counting the number of high-speed timing clocks TH.
- a third clock counting unit that outputs the initialization signal and is initialized, and a fourth clock counting unit that counts the number of low-speed timing clocks TL and is initialized by the initialization signal of the third clock counting unit.
- a clock counting unit may be provided, and the output of the fourth clock counting unit may be stored as a control value M by an initialization signal of the third clock counting unit.
- the mask signal generation unit 603 compares the control value M of the storage unit 602 with the third clock counting unit. When the count value of the third clock counting unit is equal to or smaller than the control value M, "1" (fourth logical value) is output as a mask signal, and the third clock signal is output. If the count value of the counting section is larger than the control value M, "0" (an inverted value of the fourth logical value) is output as a mask signal.
- the clock generation unit 501 receives a higher-speed timing clock TH and a lower-speed timing clock TL than the selection unit 106, and calculates a low-speed timing having the same average frequency as the other low-speed timing clock TL from the input high-speed timing clock TH. Generates a clock and outputs a high-speed timing clock and a low-speed timing clock.
- FIG. 9 is a configuration diagram of a receiving device according to the third embodiment of the present invention.
- Receiving apparatus 100 includes demodulating sections 101 and 102, first and second data expanding sections 901 and 902, control signal generating section 903, multiplexing section 904, clock generating section 905, and clock generating section 905. It is composed of a part 906.
- the first and second data decompression units 901 and 902 receive the demodulated data Dl and D2 and the timing clocks Tl and T2 synchronized with the demodulated data Dl and D2 from the demodulation units 101 and 102, respectively. Are alternately output in units of one cycle to divide and output the timing clocks Tla, Tib, T2a, and T2b, and latch the demodulated data D1 synchronized with the rising edge of each of the timing clocks Tla, Tib.
- demodulated data Dla and Dlb synchronized with the timing clocks Tla and Tib, respectively.
- the control signal generation unit 903 includes a control timing clock Tp having a short period T that is shorter than or equal to the shortest period of the timing clocks Tl and T2, and a control timing clock Tp output from the first and second data decompression units 901 and 902. Inputs two demodulation timing clocks (timing clocks Tla, Tib, T2a, T2b) Then, using the control timing clock Tp, the rising edge of the four demodulation timing clocks is detected. If the rising edge is detected within the control timing clock period ⁇ [ ⁇ ], the next control timing clock period ⁇ [ ⁇ + 1] A data control signal (Tla or Tib or T2a or T2b; identification control signal) for identifying the timing clock at which the rising edge is detected is sequentially output. If no rising edge is detected, the data control signal is held and output.
- multiplexing section 904 includes data decompression sections 901 and 902 synchronized with the data control signal.
- the multiplexed data is generated by selecting the demodulated data Dla, Dlb, D2a, and D2b output from, and is output to the AV decoder 107.
- the clock generation unit 905 receives the control timing clock Tp and the timing clocks Tla and Tib output from the first data decompression unit 901 and uses the control timing clock Tp to control the control timing clock period T
- the rising edge of the timing clocks Tla and Tib is detected by, and if either rising edge is detected within the control timing clock period T [N], the rising edge occurs during the output period of the data control signal in the next period T [N + 1].
- a first multiplex timing clock Ta having the following is generated and output to the AV decoder 107.
- the clock generation unit 906 receives the control timing clock Tp and the timing clocks T2a and T2b output from the second data decompression unit 902, and uses the control timing clock Tp to control the control timing clock period T
- the rising edge of the timing clocks T2a and T2b is detected by, and if either rising edge is detected within the control timing clock period T [N], the rising edge occurs during the output period of the data control signal in the next period T [N + 1].
- a second multiplex timing clock Tb having the following is generated and output to the AV decoder 107.
- the first data decompression section 901 alternately outputs the timing clock T1 in units of one cycle, and outputs the divided timing clocks Tla and Tib. Also, it demodulates data D1 synchronized with the rising edges of the timing clocks Tla and Tlb to generate demodulated data Dla and Dlb synchronized with the timing clocks Tla and Tib, respectively.
- the second data decompression unit 902 outputs the timing clocks T2a and T2b, and outputs the timing clocks T2a and T2b. Generates synchronized demodulated data D2a and D2b, respectively.
- the control signal generation unit 903 detects the rise of four demodulation timing clocks (timing clocks Tla, Tib, T2a, T2b) by using a control timing clock Tp that is shorter than the shortest cycle of the timing clocks Tl, T2. If a rising edge is detected within a certain control timing clock cycle T [N], a data control signal for identifying the timing clock whose rising edge is detected in the next cycle T [N + 1] is sequentially output, and the rising edge is detected. If not, hold and output the data control signal.
- Multiplexing section 904 generates and outputs multiplexed data by selecting demodulated data Dla, Dlb, D2a, and D2b according to the data control signal.
- the data control signal of the cycle T [2] indicates Tla and T2a
- the contents AO and BO of Dla and D2a corresponding to each are output as multiplexed data.
- the first clock generation unit 905 detects the rise of the timing clocks Tla and Tib at the control timing clock period T, and detects either rising force S within the control timing clock period T [N].
- the first multiplex timing clock Ta having the rising edge S during the output period of the data control signal in the next cycle T [N + 1] is generated and output.
- the timing clock Tla rises in the cycle T [l]
- the first multiplex timing clock Ta is generated so as to have a rise during the period of the data control signal power Tla in the cycle T [2].
- the second clock generation unit 906 also detects the rise of the timing clocks T2a and T2b in the control timing clock period T [N], and thereby performs the next cycle.
- the second multiplex timing clock Tb is generated and output at T [N + 1].
- the data is generated by using the control timing clock Tp faster than the timing clocks Tl and T2.
- control timing clock cycle T is set to the timing clock Tl or lZm of ⁇ 2 (m is a natural number of 2 or more), synchronous design becomes possible, and further improvement in design efficiency can be achieved. is there.
- the data decompression units 901 and 902 may hold demodulated data when the timing clocks Tl and T2 rise or fall.
- FIG. 11 the same components as those in FIG. 1 are denoted by the same reference numerals and a and b for identifying the two systems, and description thereof is omitted.
- the receiving apparatus outputs 4n types of received signals (n is a positive integer of 1 or more; in FIG. 11, four received signals A, B, C, and D having different broadcast systems). It is a receiving device that receives and has 2n (two in FIG. 11) receiving devices 100 described in the first embodiment arranged in parallel, generates 4n types of timing clocks and 2n types of multiplexed data, and generates an AV decoder. Output to 107. It should be noted that a demodulation unit adapted to the broadcast system of each received signal is provided.
- the fourth embodiment when receiving 4n types of reception signals, by providing 2n reception devices shown in the first embodiment in parallel, 2n types of multiplexed data are output. be able to. In addition, it is possible to multiplex two demodulated data without using a large-scale memory, which makes it easy to design and avoids an increase in the area of the board on which the receiver is mounted. Can be provided at low cost.
- the receiving device according to the fourth embodiment has the configuration of the receiving device described in the first embodiment
- the receiving device according to the second or third embodiment may have the configuration.
- demodulation units of each broadcasting system may be combined and provided.
- the 4n types of received signals are defined as four different received signals A, B, C, and D of the broadcast system.
- the 4n types of received signals are all broadcasts of the same broadcast system or a mixture of the same and different broadcast signals. It doesn't matter if it's a system.
- FIG. 12 is a configuration diagram of a processor that executes the receiving method of the fifth embodiment.
- reference numerals 1201 and 1202 denote input iZFs for inputting received signals A and B of each broadcast system.
- 1203 is a general-purpose built-in memory.
- Reference numeral 1204 denotes a CPU that performs control and calculation
- 1205 denotes a ROM that stores a control program and the like.
- Reference numeral 1207 denotes an output IZF for outputting to the AV decoder 107 a multiplexed data obtained by multiplexing demodulated data obtained by demodulating each received signal and a timing clock synchronized with each of the multiplexed demodulated data.
- the input I / Fs 1201 and 1202, the built-in memory 1203, the CPU 1204, the ROM 1205, and the output I / F 1207 are connected by a bus 1208.
- a receiving method by the CPU 1204 will be described with reference to a flowchart of FIG.
- the received signals A and B are demodulated based on the respective schemes, the respective demodulated data Dl and D2 are generated in byte units, and the timing clocks T1 and T2 synchronized with them are generated.
- Step S2 speed judgment step
- step S1 the speed determination processing of the two timing clocks Tl and T2 generated in step S1 is performed, and the two timing clocks Tl and T2 are output as a high-speed timing clock TH and a low-speed timing clock TL. Also, the two demodulated data Dl and D2 generated in step S1 are output as high-speed demodulated data DH and low-speed demodulated data DL synchronized with the high-speed timing clock TH and the low-speed timing clock TL.
- Step 1 (Clock generation step)
- the low-speed timing clock TL and the average frequency are equal to generate a low-speed timing clock.
- This clock generation step S3 is composed of the following steps S4-S6 in more detail.
- Step S4 (memory step)
- the count value of the low-speed timing clock TL counted at every predetermined period n of the high-speed timing clock TH is stored as a control value M.
- the logical value "1" is output as a mask signal, and if it is larger than the control value M, the logical value "0" is output.
- the high-speed timing clock TH is output as the high-speed timing clock TH when the mask signal output from step S5 is the logical value "1", and the logical value "L” is output as the low-speed timing clock when the mask signal is the logical value "0".
- Step—S7 Multiple processing step
- two demodulated data D1 and D2 can be multiplexed in byte units with a general-purpose processor configuration, and the capacity of the general-purpose memory 1203 is significantly reduced.
- inexpensive ones can be used, and the cost of the entire system can be reduced.
- the receiving apparatus can multiplex two demodulated data by adding a small circuit without using a large-scale memory. Power consumption can be reduced, and the timing clock synchronized with the multiplexed demodulated data can be synchronized with a single timing clock such as a high-speed timing clock or a higher-speed internal timing clock. It is possible to ease the timing constraints of the decoder, and the effect that a cheaper system can be constructed. Because of this, it can be applied to applications such as systems that receive multiple broadcasts at one place in remote places and distribute received data widely.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
Claims
Priority Applications (2)
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JP2006512474A JP4439514B2 (ja) | 2004-04-23 | 2004-11-18 | 受信装置とこの受信装置を使用した受信システムおよびその受信方法 |
US11/547,282 US7720113B2 (en) | 2004-04-23 | 2004-11-18 | Receiving apparatus, receiving system using same, and receiving method thereof |
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JP2004127469 | 2004-04-23 | ||
JP2004-127469 | 2004-04-23 |
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WO2005104540A1 true WO2005104540A1 (ja) | 2005-11-03 |
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PCT/JP2004/017155 WO2005104540A1 (ja) | 2004-04-23 | 2004-11-18 | 受信装置とこの受信装置を使用した受信システムおよびその受信方法 |
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US (1) | US7720113B2 (ja) |
JP (1) | JP4439514B2 (ja) |
CN (1) | CN100452848C (ja) |
WO (1) | WO2005104540A1 (ja) |
Cited By (1)
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CN101093403B (zh) * | 2006-06-22 | 2011-12-21 | 国际商业机器公司 | 减小时钟电路和时钟管理电路中的电磁干扰的方法 |
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US8107499B2 (en) * | 2007-06-21 | 2012-01-31 | Cisco Technology, Inc. | Speed negotiation for multi-speed communication devices |
CN111147053B (zh) * | 2019-12-26 | 2023-03-14 | 深圳市紫光同创电子有限公司 | 无毛刺时钟切换电路 |
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JPH11122556A (ja) * | 1997-10-17 | 1999-04-30 | Matsushita Electric Ind Co Ltd | ディジタル放送受信装置 |
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US5742680A (en) * | 1995-11-13 | 1998-04-21 | E Star, Inc. | Set top box for receiving and decryption and descrambling a plurality of satellite television signals |
JPH11196348A (ja) * | 1997-12-26 | 1999-07-21 | Funai Electric Co Ltd | デジタル放送受信機 |
JP3937564B2 (ja) * | 1998-03-24 | 2007-06-27 | 三菱電機株式会社 | ディジタルビデオ受信装置 |
CN1214633C (zh) * | 1998-09-16 | 2005-08-10 | Actv公司 | 用于执行两个数字视频信号之间无缝切换的方法和装置 |
US6522671B1 (en) * | 1999-05-10 | 2003-02-18 | Nortel Networks Limited | Protocol independent sub-rate device |
US6721957B1 (en) * | 1999-08-16 | 2004-04-13 | Georgia Tech Research Corporation | System and method for maximizing bandwidth efficiency in a digital video program stream |
US6563346B2 (en) * | 2000-12-13 | 2003-05-13 | International Business Machines Corporation | Phase independent frequency comparator |
JP3717173B2 (ja) * | 2002-07-26 | 2005-11-16 | 株式会社日立国際電気 | デジタルデータ受信装置およびデジタルデータ受信方法 |
-
2004
- 2004-11-18 US US11/547,282 patent/US7720113B2/en not_active Expired - Fee Related
- 2004-11-18 CN CNB2004800424198A patent/CN100452848C/zh not_active Expired - Fee Related
- 2004-11-18 WO PCT/JP2004/017155 patent/WO2005104540A1/ja active Application Filing
- 2004-11-18 JP JP2006512474A patent/JP4439514B2/ja not_active Expired - Fee Related
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JPH0614308A (ja) * | 1992-06-24 | 1994-01-21 | Matsushita Electric Ind Co Ltd | データ多重方法およびデータ多重装置 |
JPH10173623A (ja) * | 1996-12-05 | 1998-06-26 | Oi Denki Kk | 伝送レート切替判定処理方式 |
JPH11122556A (ja) * | 1997-10-17 | 1999-04-30 | Matsushita Electric Ind Co Ltd | ディジタル放送受信装置 |
JP2002185901A (ja) * | 2000-12-11 | 2002-06-28 | Hitachi Ltd | デジタル放送受信装置 |
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Publication number | Publication date |
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US7720113B2 (en) | 2010-05-18 |
US20070274399A1 (en) | 2007-11-29 |
CN100452848C (zh) | 2009-01-14 |
JP4439514B2 (ja) | 2010-03-24 |
JPWO2005104540A1 (ja) | 2007-08-30 |
CN1926853A (zh) | 2007-03-07 |
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