WO2001082603A1 - Systeme de services de diffusion de donnees du type a stockage - Google Patents
Systeme de services de diffusion de donnees du type a stockageInfo
- Publication number
- WO2001082603A1 WO2001082603A1 PCT/JP2001/003300 JP0103300W WO0182603A1 WO 2001082603 A1 WO2001082603 A1 WO 2001082603A1 JP 0103300 W JP0103300 W JP 0103300W WO 0182603 A1 WO0182603 A1 WO 0182603A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pcr
- program
- clock
- transmission rate
- stc
- Prior art date
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
- H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
-
- 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
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/4147—PVR [Personal Video Recorder]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/80—Responding to QoS
-
- 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
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4344—Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
-
- 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
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
Definitions
- the present invention relates to a storage-type data transmission service system used for digital broadcasting and the like, and more specifically, to a transmission rate different from a standard transmission rate set at the time of creation.
- the present invention relates to a storage-type information transmission and reception system that can record and decode digitally compressed video and audio data transmitted at high speed at the receiving side.
- a storage-type digital broadcast service for broadcast content using digital compression encoding technology for images has reached a stage of practical use.
- a content supplier such as a broadcasting station digitally compresses the broadcast content and broadcasts the video / audio data to the user.
- digital compressed video and audio data to be broadcasted is stored in the digital storage media (Digita 1 Storage Media: DSM). Later, it reads from the storage media and reproduces the content using a digitally compressed image restoration device for viewing.
- DSM Digita 1 Storage Media
- FIG. 7 shows a digital satellite broadcast receiver with a built-in hard disk as an example of a storage-type data receiver conventionally used for storage-type data broadcasting services.
- the configuration is shown.
- the product-type data receiver SDR c consists of a transmission line decoder 100, a data accumulator 200, a program extractor 210, a video decoder 230, a memory 270, a digital Video encoder 250, controller 260, STC regenerator 500, PCR extractor 510, selector S1 and selector S2 Including.
- the transmission path decoder 100 converts the digitally modulated wave TSm, which is digital compressed video and audio data, broadcast from a transmitting device such as a broadcasting station represented by CS or BS. It is connected to a receiving antenna or the like (not shown) and decodes the received digital modulated wave TSm to demodulate the transport stream TS.
- the transport stream TS includes a plurality of bucket data (hereinafter abbreviated as “packet TSP” as necessary) constituting a plurality of programs. It has been.
- the selector S 1 selects one of the output port of the transmission line decoder 100 and the output port of the data accumulator 200 and selects one of the output ports of the PCR extractor 500 10. Connect to both the input port and the input port of the program extractor 210.
- the selector S2 interrupts the output port of the program extractor 210 and the input port of the data accumulator 200.
- the length extractor 500 1 0 is connected to the transport port stream 100 input from the transmission path decoder 100 0 via the selector S 1. ⁇
- the program reference included in the bucket TSP of the specific program selected by the user (hereinafter abbreviated as “PCR” as necessary) Is extracted.
- the PCR is information that is embedded in the packet TSP at predetermined intervals to ensure that the program is played back correctly. You.
- PCR extractor 510 is connected to the trans- port stream TS s input from the data accumulator 200 via the selector SI. Then, PCR is extracted.
- the STC regenerator 500 generates a system time clock (hereinafter referred to as “STC” as necessary) based on the PCR input from the PCR extractor 510. Abbreviated). STC is the one belonging to the same program in all the buckets TSP included in the received transport stream Ts. This is a reference link that synchronizes processing for the KTS TSP.
- the program extractor 210 outputs a transmission path decoder 100 through a selector S1 based on the STC input from the STC reproducer 500.
- a bucket TSP corresponding to a desired program is extracted from a plurality of programs or program information multiplexed in the transport port stream TS input from the Generate the transport stream TS s.
- the transport stream TS s extracts a specific bucket TSP from all the bucket TSPs that make up the transport stream TS. Generated.
- these two types of transport streams TS and TS s are referred to as the next transport stream TS and the secondary transport stream, respectively. Each of them is referred to as a sport stream TS s and is identified. If you do not need to identify them, It is simply referred to as a transport port stream TS.
- the data storage device 200 stores the secondary transport stream TS s input from the program extractor 210 via the selector S2.
- the data accumulator 200 is preferably constituted by a large-capacity rewritable recording device such as a hard disk.
- the video decoder 230 restores the digital video signal D v from the secondary transport stream TS s input from the program extractor 210. At the same time, on-screen synthesis is performed as necessary.
- the memory 270 operates as a low-power memory of the video decoder 230, and the digital video signal restored by the video decoder 230 is used. No. DV is stored and read out sequentially.
- the digital video encoder 250 converts the digital video signal Dv input from the video decoder 230 into a desired video signal SV such as an NTSC system or a PAL system. Encode and output.
- the controller 260 controls the operation of all the components of the storage-type data receiving device SDRc according to a user's instruction.
- the selector S1 transmits the program.
- Path decoder 100 0 and select Rector S2 disconnects the program extractor 210 from the data accumulator 200. Then, the secondary transport stream TSs generated by the program extractor 210 is applied to the video decoder 230, the memory 270, and the like.
- the digital video signal SV of the program desired by the user is output from the storage-type data receiving device SDRc after receiving the processing by the digital video encoder 250.
- the selector S1 selects the transmission path decoder 100.
- the selector S2 connects the data accumulator 200 to the program extractor 210. Then, the secondary transport stream TSs generated by the program extractor 210 is accumulated in the data accumulator 200.
- the secondary transport stream TS s is the video decoder 230, the memory 270, and the digital
- the digital video signal SV of the program desired by the user is output from the storage-type data receiver SDRc.
- the controller 260 controls the video decoder 230, the memory 270, and the digital video encoder 250. Stop the operation.
- the user desires to view and listen to the program provided by the secondary transport stream TS s stored in the data storage device 200 as described above.
- the selector S1 selects the data storage device 200, and the selector S2 disconnects the connection between the program extractor 210 and the data storage device 200. .
- the data The secondary transport stream TS s read from the detector 200 is supplied to the PCR extractor 5 via the selector S1.
- the digital data of the program input to both 0 10 and the program extractor 210 and extracted in the secondary transport stream TS s as a result of the above processing Video signal SV is stored data receiver
- FIG. 8 shows a detailed configuration of the above-mentioned STC regenerator 500.
- the STC regenerator 500 has a comparator 110, a digital fin- olator 110, a DZA converter 112, a low-pass fin- olator 110, and a voltage control crystal. Includes oscillator (hereinafter abbreviated as “VCXO”) 114 and system clock counter 115.
- VCXO oscillator
- the comparator 11010 receives the PCR value input from the PCR extractor 50010 and the system clock counter 1151 input the PCR value.
- the difference from the system clock time T [STC] is detected, and the difference ⁇ is output to the digital fin- olator 1110.
- the jitter detector 11110 controls the difference ⁇ P input from the comparator 11010 by digitally filtering the difference ⁇ P input from the comparator 1101, thereby controlling ⁇ P correction. Generates signal dP and outputs it to DZA converter 111.
- the DA converter 112 converts the control signal dP for ⁇ P correction input from the digital nodal filter 110 into a voltage VdP, and outputs a low-pass signal. Output to the output pin.
- the P-pass filter 113 removes the high-frequency noise component from the voltage VdP input from the DZA converter 112. Output to VCXO 114 0 as control voltage VdP.
- VCX ⁇ 1140 is a clock signal SF (Vdp) of frequency F (Vdp) corresponding to the control voltage VdP input from the low-pass fin- olator 1130. ).
- This clock signal SF (Vdp) is output to the program extractor 210 as STC.
- the system clock counter 1150 counts the clock signal SF (Vdp) input from the VCXOl 140 output, and counts the clock signal SF (Vdp).
- the default value is output as STC.
- This STC is output to comparator 11010, and a difference ⁇ from the input PCR is obtained.
- the transport port stream T S is composed of a plurality of continuous bucket T S P cards. These KTSs belong to groups that make up different programs.
- the predetermined time interval Pt is specified as, for example, within 100 ms in MPEG2.
- the nth node in the bucket D SP belonging to the group constituting the same program included in the transport port stream TS contains the time information of the (i-11) th PCR (i-11).
- n and i are arbitrary natural numbers.
- PCR (i-1) The packet TSP ( ⁇ + ⁇ ) located after a separation time Pa (i) within 100 ms from the packet TSP (n) has the i-th time indicating the time at which it should arrive.
- the PCR (i) force is applied. That is, PCR (i) indicates the reference time T [PCR (i)] after the separation time Pa (i) from the reference time T [PCR (i1-1)].
- ⁇ is a natural number corresponding to the number of packets T SP arranged in the separation time Pa (i).
- PCR (i + 1) indicates the reference time T [PCR (i)] after the separation time Pa (i + 1) from the reference time T [PCR (i)].
- i3 is arranged within the separation time P a (i + 1). This is a natural number corresponding to the number of packets TSP.
- the bucket TSP (n + a + ⁇ ) The bucket TSP ( ⁇ + ⁇ + i3 + ⁇ ) located after a separation time Pa (i + 2) within 100 ms from the force The (i + 2) th PCR (i + 2) indicating the time is given. That is, the PCR (i + 2) is equal to the reference time T [PCR (i + 1)] and the reference time T [PCR (i + 2) after the separation time Pa (i + 2). 2)].
- ⁇ is a natural number corresponding to the number of buckets TSP arranged in the separation time Pa (i + 2). .
- the PCR extractor 510 extracts PCR (i-1) and inputs it to the comparator 110 0
- the controller 260 in FIG. 7 sets the value of PCR (i-1) as the initial value of the system clock counter 115.
- STC (i-1) having the same value as PCR (i-1) is output.
- the time values of the PCR and the system time clock STC are, as described above, the reference time T [PCR] and the time value of the STC, respectively. It is expressed as the system clock time T [STC].
- the comparator 110 0 0
- the clock difference ⁇ ⁇ (i-1) output from the force is zero.
- VdP (i-1) Based on this control voltage VdP (i-1), VCxo114 oscillates the frequency F of the initial set value clock (Vdp (i-1)). Note that the initial setting clock of V CXO 114 is normally set to 27 MHz.
- the VCXO 114 0 clocks are clocked by the VCXOil 40 initial clock (27 MHz) at the reference time T [PCR (i-1)].
- the signal SF (Vdp (i-1)) is output to the system clock counter 115 and the S. TC is output to the program extractor 210. Is output as
- the system clock counter 1150 sets the pulse of the input clock signal SF (Vdp (i-1)) to the PCR (i- 1) in which the pulse is initialized. ), Counts sequentially, and outputs the result to the digital filter 1110.
- [STC (i)] is a signal of the clock signal SF (Vdp (i-1)) counted in T [STC (i1-1)] within the separation time Pa (i). It is calculated by the following equations (1) and (2) as a value obtained by adding the calculated separation time Pc (i) defined by the number of screws.
- the STC regenerator 500 performs the feedback control described below to accurately reproduce the STC from the PCR.
- FIG. 9 exemplifies a case where the transmission frequency of VCXOL140 is higher than an appropriate value. That is, when the PCR (i-1) is extracted, the STC (i-1) power is set to the SPCR (i-1). (i-1) is zero. In this case, the output The frequency F (Vdp (i-1)) of the lock signal SF (Vdp (i-1)) is the reference oscillation frequency of the VCXO114. That is, the reference transmission frequency of the VCXO 114 0 is higher than the PCR of the transport stream TS input to the storage-type data receiver SDRc. . As a result, the number of counts counted by the system clock counter 1 150 during the separation time Pa (i) C (Pa (i) / F (Vdp (i )) Is more than appropriate.
- the system clock time T [STC (i)] measured within the separation time Pa (i) is different from the reference time T [PCR (i)] by the clock difference. Only P (i) is different.
- the system clock time T [STC (i) is different from the reference time T [PCR (i)] that is originally the same by the clock difference ⁇ P (i). ) ”.
- the storage-type data receiver SDRc does not operate properly when the STC reproduced from the PCR and the reproduction source PCR are not synchronized.
- the low-noise filter is used.
- the control voltage VdP (i) output from the input device also becomes equal to or lower than the reference voltage (hereinafter, simply referred to as minus). Therefore, according to the control voltage VdP (i) of this negative value, the transmission frequency 1 ⁇ ( ⁇ (1) of the ⁇ 0 0 1 1 4 0 is lower than that of the previous time. As a result, the input signal SF (Vdp (i)) having a lower frequency than the previous control voltage VdP (i1-1) is output. Is done.
- the packet TSP (n + a + ⁇ ) is input, and ⁇ During the separation time Pa (i + 1) until CR (i + 1) is extracted, the system clock counter 1 150 power S clock signal to be measured
- the number of counts C (P a (i + 1) / F (V dp (i + 1)) of SF (V dp (i + 1)) is the number of counts C (P a ( i) / F (Vdp (i)).
- the clock difference ⁇ ⁇ (i + 1) between the reference time T [PCR (i + 1)] and the system clock time T [STC (i + l)] is Although it is smaller than the clock difference P (i), it is still negative.
- VCXO1140 is smaller than the reference oscillation frequency by the negative control voltage VdP (i + 1) whose absolute value is smaller than the control voltage VdP (i).
- VCX ⁇ 114 0 force is output as STC (i + 1).
- the clock difference between the reference time T [PCR (i + 2)] and the system clock time T [STC (i + 2)] ⁇ P (i + 2) is smaller than the previous clock difference ⁇ ⁇ (i + 1), and becomes a positive value. That is, the system clock time T [STC (i + 2)] is only the clock difference ⁇ (i + 2) more than the reference time T [PCR (i + 2)].
- the absolute value of the clock difference ⁇ ⁇ (i + 2) is smaller than the absolute value of the clock difference ⁇ ⁇ (i + 1). It has been improved.
- VCXO1140 is slightly smaller than the reference oscillation frequency due to the control voltage VdP (i + 2) of the plus whose absolute value is smaller than the control voltage VdP (i + 1).
- a clock signal SF (V dp) having a large frequency frequency F (V dp (i + 2)) that is large and large compared to the previous frequency F (V dp (i + 1)) (i + 2))
- the output from the SVCX 0 1140 output is STC (i + 2).
- the reproduced STC follows the PCR, and the control voltage VdP of the VCXO 114 0 converges correctly. Finally, the reference time T [PCR] and the system clock time IJT [STC] match, and the STC synchronized with the PCR is reproduced.
- the first correctly read PCR is set to the initial value of the system clock counter 115.
- both the PCR extractor 501 and the program extractor 210 are transmission path decoders 100. Connected to. Similarly, program extractor 210 is connected to data accumulator 200 by selector S2.
- the PCR extractor 510 is used for transmitting the transport stream TS input from the transmission line decoder 100 to the program selected by the program extractor 210.
- the PCR is extracted from the corresponding bucket TSP card and output to the STC regenerator 500.
- the STC reproducer 500 reproduces the STC synchronized with the PCR and outputs it to the program extractor 210.
- the program extractor 210 is input from the STC reproducer 500 Based on the STC, a packet TSP constituting a desired program is extracted from a transport port stream TS input from the transmission path decoder 100, and Generate the next transport port stream TS s. The generated secondary transport stream TSs is recorded in the data accumulator 200.
- the secondary transport stream T SS s recorded in the data storage device 200 is reproduced.
- the selector S 1 linked by the controller 260 the PCR extractor 501 and the program extractor 210 are stored in the data storage unit 210. Connected to 0.
- the selector S2 disconnects the data accumulator 200 from the program extractor 210.
- the secondary transport stream TS s is read from the data accumulator 200, and the PCR extractor 50010 and the program extractor 2 are read. It is input to 10.
- the PCR (i) recorded in the secondary transport stream TSs is different from the playback time, but the separation time Pa (i) is correct. The STC will play correctly.
- the program recorded in the secondary transport stream T SS s Based on the reproduced STC, the program recorded in the secondary transport stream T SS s.
- the packet TSP is extracted and output to the video decoder 230.
- the secondary transport stream TS s input to the program extractor 210 is a secondary transport stream TS s extracted and output by the program extractor 210. The same as the transport port stream TS s.
- the once-created transport port stream TS is used. Even when data is transmitted and received at the time of creation or at a different time (date and time) from the scheduled transmission and reception, the secondary traffic stored from the data storage device 200 is also stored. When reading the transport stream TS s, the STC can be correctly reproduced.
- the transport stream stream TS is created, and the buckets TSP that make up each program are transmitted in a different bitstream from the original. It needs to be sent out depending on the speed. In other words, on low-speed or congested transmission lines, the transport port stream
- T S Transmit T S at a lower bitstream transmission rate.
- the transmission time can be extended to increase the capacity of the transport stream TS. Can be transmitted and received and stored.
- the transport stream TS should be transmitted at a higher bit stream transmission rate than originally expected. Thus, the use time of the transmission path can be shortened.
- the bit stream transmission rate at which the transport stream TS is actually transmitted is determined by the transport rate of the transport stream. It is N times (N is an arbitrary number) the original bitstream transmission speed of the TS stream TS. Hereinafter, this N is referred to as the transmission rate ratio.
- the system clock counter 1 150 outputs S output. That is, the calculated separation time Pc (i) is not the original separation time Pa (i), but is a clock counted during 1 / N of the separation time Pa (i). This is the count value of the back signal SF (Vdp (i)).
- the system clock time T [STC (i)] measured within the separation time Pa (i) is equal to the reference time T [PCR (i)].
- the present invention provides an original bit stream transmission without re-encoding the transport port stream TS.
- Stored data reception that enables the system timer included in the bit stream to be reproduced correctly even if the bit stream is transmitted at a different bit stream transmission speed.
- the purpose is to provide equipment. Disclosure of the invention
- the present invention has the following features in order to achieve the above object.
- a first aspect of the present invention is a program that forms at least one or more contents and is reference clock information when reproducing the contents.
- a first transport stream containing a plurality of bucket data having a clock reference is used to determine a first transmission rate and a first transmission rate determined by the reference clock information.
- the second transport stream is transmitted at a transmission rate of 2, and a plurality of packet data forming contents from the transmitted transport port stream is extracted to form a second transport stream.
- This is a storage-type data broadcasting service system that generates and stores a transport stream.
- the transmitted first transport stream is received, a transmission rate ratio between the first transmission rate and the second transmission rate is detected, and the transmission rate ratio is detected.
- a data transmission service system having a receiver for generating a second transport stream based thereon.
- the receiver comprises a program clock reference included in the first transport stream.
- the transmission rate ratio is detected based on the two consecutive program references that are extracted, and the program extracted based on the transmission rate ratio is detected.
- a PCR correction coefficient calculator for determining a correction coefficient for correcting the RAM clock reference so as to match the second transmission speed;
- a PCR corrector for correcting the extracted program reference based on the correction coefficient, and the STC reproducer has a corrected program reference.
- the system is characterized in that feedback control is performed so as to reproduce a system time clock based on the reference.
- the receiver further comprises a programmable clock reference included in the first transport stream.
- a PCR corrector that corrects the extracted program reference based on the correction coefficient, and the STC reproducer has a corrected program clock.
- the system is characterized in that feedback control is performed so as to reproduce a system time clock based on the reference.
- the receiver further includes a program clock reference included in the first transport stream.
- a PCR extractor to extract the lens is included in the first transport stream.
- the reference clock included in the first transport stream and included in the packet data transmitted at the first transmission rate is a standard program.
- a PCR r designator to be extracted by the PCR extractor is a standard program.
- the system clock which is the clock for processing the socket data, is based on the extracted clock.
- the transmitter further comprises a transmission rate ratio adder for providing a transmission rate ratio to the first transport port stream TS.
- the receiver is
- the system clock which is the bucket data processing reference clock, is regenerated.
- a transmission rate ratio is extracted from the first transport port stream, and a program reference is extracted based on the extracted transmission rate ratio.
- Correction coefficient generator for determining a correction coefficient for correcting the data so as to match the second transmission rate, and a program clock reference extracted based on the correction coefficient.
- a PCR compensator that compensates for the noise, and the STC regenerator is based on the compensated program It is characterized in that feedback control is performed so as to reproduce an im clock.
- FIG. 1 shows a storage type data according to the first embodiment of the present invention.
- FIG. 2 is a block diagram schematically illustrating a configuration of a receiver.
- FIG. 2 shows the relationship between the program clock reference and the system time clock in the storage type data receiver shown in Fig. 1.
- FIG. 3 schematically shows the configuration of a transmission speed ratio information adding device that adds a transmission speed ratio information to a transport stream TS according to the first embodiment of the present invention. It is a block diagram shown.
- FIG. 4 is a block diagram schematically illustrating a configuration of a storage-type data receiving device according to a second embodiment of the present invention.
- FIG. 5 is a block diagram schematically illustrating a configuration of a storage-type data receiving device according to a third embodiment of the present invention.
- FIG. 6 is a block diagram schematically illustrating a configuration of a storage-type data receiving apparatus according to a fourth embodiment of the present invention.
- FIG. 7 is a block diagram schematically showing a configuration of a conventional storage-type data receiving device.
- FIG. 8 is a block diagram showing a detailed structure of the STC regenerator shown in FIG.
- Fig. 9 shows the relationship between the program clock reference and the system time clock in the storage type data receiver shown in Fig. 7. It is a diagram.
- the transmission speed ratio is set in an area open to the user. Embed N and send. Then, on the receiving side, the transmission speed ratio N is extracted from the received transport port stream TS card, and the system time slot STC is correctly reproduced. It is what you do.
- the storage-type data receiver SDR 1 includes a transmission line decoder 100, a data storage 200, a program extractor 210, a video decoder 230, and a memory. 270, digital video encoder coder 250, controller 260, STC regenerator 500, PCR correction coefficient generator 500, PCR corrector 520, PCR extractor 510, selector S1, selector S2, and selector S3.
- the storage-type data receiving device SDR1 has a configuration very similar to the conventional storage-type data receiving device SDRc shown in FIG.
- the storage-type data receiver SDR1 is connected to the storage-type data receiver SDRc by adding a PCR correction coefficient generator 500, a PCR corrector 5002, and a selector. Tar S 3 is additionally provided. Therefore, in this specification, the same reference numerals are given to the components substantially equivalent to the components of the storage-type data receiver SDRc described above. And explain briefly In addition, the description focuses on the specific components of the present invention.
- the transmission path decoder 100 is an antenna or the like (not shown) that receives the digitally modulated wave TS m of the digital compressed video and audio data distributed from a transmitting device such as a broadcasting station. Connected to the receiver, the received digitally modulated wave TS m card, BS or CS, etc., a noise port (LNB), etc. Reproduce the game TS.
- the transport port stream T S includes a plurality of bucket data T S Ps constituting a plurality of programs.
- the selector S 1 selects one of the output port of the transmission line decoder 100 and the output port of the data accumulator 200 and selects the PCR correction coefficient generator 500 0. 0 input port, the PCR extractor 510 input port, and the program extractor 210 input port.
- the selector S2 interrupts the output port of the program extractor 210 and the input port of the data accumulator 200.
- the selector S3 interrupts the output port of the PCR correction coefficient generator 500 and the input port of the arithmetic unit 520.
- the PCR extractor 510 is provided with a transport port stream TS output from the transmission line decoder 100 input through the selector S 1, Alternatively, the secondary transport stream TS s output from the data storage device 200 is included in the bucket TSP of the selected program. Extract the PCR.
- the PCR correction coefficient generator 500 0 0 The transmission rate ratio N embedded in the user area of the realm TS is extracted, and a correction coefficient K for correcting the corresponding PCR according to the transmission rate ratio N is generated.
- the PCR corrector 50020 converts the PCR input from the PCR extractor 50010 into the PCR correction coefficient generator 5000 via the selector S3.
- the input signal is corrected by the input correction coefficient K, and the correction program corresponding to the actual transmission speed ratio N is referred to as PCR c (hereinafter referred to as ⁇ PCR c '' as necessary). ) And outputs it to the STC reproducer 500.
- the STC regenerator 500 reproduces the STC based on the PCRC input from the PCR extractor 510.
- the program extractor 210 receives a desired program from a plurality of programs or program information multiplexed in the transport stream TS input from the transmission path decoder 100. A bucket TSP corresponding to the program is extracted to generate a secondary transport stream TS s.
- the data accumulator 200 is usually composed of a hard disk or the like, and the secondary traffic input from the program extractor 210 via the selector S2 is used.
- the transport stream TS s is recorded and stored.
- the video decoder 230 uses the memory 270 as a local memory, and uses the secondary track input from the program extractor 210 to input the data from the program extractor 210.
- the digital video signal Dv is restored from the transport stream TS s, and the on-screen synthesis is performed as necessary.
- the digital video encoder 250 is a video encoder 2 It encodes the digital video signal Dv input from 30K into a desired video signal SV such as the NTSC system or the PAL system and outputs it.
- the controller 260 controls the operation of the other components of the storage-type data receiver SDR1 described above.
- selector S1 controls the transmission path decoder 100 to operate.
- Selector S2 connects data accumulator 200 to program extractor 210, and selector S3 connects PCR correction coefficient generator 5000 to PCR corrector. Connect to 520.
- the PCR extractor 50010 extracts the PCR from the transport port stream TS input from the transmission line decoder 100 via the selector S1. Extract .
- the PCR correction coefficient generator 500 00 corrects the transport stream stream input from the transmission path decoder 1 ⁇ 0 via the selector S 1 from the TS card. Generate the coefficient K. ? 1
- the corrector 520 0 generates PCR c based on the PCR and the correction coefficient K input from the PCR extractor 510 and the PCR correction coefficient generator 500 0, respectively.
- the regenerator 500 correctly reproduces the system time clock STC based on the PCRc input from the PCR corrector 520.
- the program extractor 210 receives a signal via the selector S1 based on the system time clock STC input from the STC reproducer 500.
- Transmission stream input from the input of the transmission line decoder 100 Generate the transport stream TS s.
- the data accumulator 200 is connected to the secondary trans- port stream TS s input from the program extractor 210 via the selector S2. Accumulate.
- the secondary transport stream TS s If the user desires to view the program provided by the secondary transport stream TS s, the secondary transport stream TS s;
- the digital video signal SV of the program desired by the user is processed by the coder 230, the memory 270, and the digital video encoder 250 '. Is output from the storage-type data receiver SDR1.
- the controller 260 controls the video decoder 230, the memory 270, and the digital video encoder 250. Stop the operation.
- the user desires to view and listen to the program provided by the secondary transport stream TS s stored in the data storage device 200 as described above.
- the selector s1 selects the data storage device 200, and the selector S2 disconnects the connection between the program extractor 210 and the data storage device 200. Then, the selector S3 disconnects the connection between the PCR correction coefficient generator 500 and the PCR corrector 520.
- the secondary transport stream TS s read out from the data accumulator 200 is used to generate the PCR correction coefficient via the selector S1.
- the input is made to each of the device 500, the PCR extractor 510, and the program extractor 210.
- the correction coefficient generated by the PCR correction coefficient generator 500 is not output to the PCR corrector 520. This is, When the secondary transport stream TSs stored in the data storage device 200 is reproduced, the correction coefficient K obtained by the PCR correction coefficient generator 500 is used. Generation is not required.
- the transport stream TS s although the separation time Pa between PCRs is distorted by the transmission speed ratio N, the secondary time is recorded at the data storage unit 200.
- the transport port stream TS s is a type in which the relationship of the separation time Pa between PCRs is properly maintained.
- the transport stream TS transmitted when the transmission speed ratio N is not equal to 1 The secondary transport stream TS s generated from the TS output Since the packet TSP is changed on the time axis at the time of output from the program extractor 210, the separation time Pa between PCR is the transmission speed ratio N Distorted by the minute. Since the packet TSP is recorded in a complete unit that does not change on the time axis, the separation time Pa between the PCRs is transmitted to the This is the same as when the speed ratio N is 1.
- the operation of the above-mentioned storage type data receiving apparatus SDR1 will be described.
- the recording of the secondary transport stream TS s in the data accumulator 200 will be described.
- the selector S1 linked by the controller 260 the PCR correction coefficient generator 500,.
- the scale extractor 501 and the program extractor 210 are both connected to the transmission path decoder 100.
- the data is stored by the selector S2.
- the unit 200 is connected to the program extractor 210.
- the PCR correction coefficient generator 500 is connected to the PCR corrector 520 by a selector S3.
- the PCR extractor 50010 receives a program from the transport stream TS input from the transmission path decoder 100 via the selector S1.
- the PCR is extracted from the bucket TSP corresponding to the program extracted by the extractor 210 and output to the PCR corrector 520.
- the PCR correction coefficient generator 500 0 outputs the transport port stream TS input from the transmission path decoder 100 via the selector S 1.
- the transmission rate ratio N is extracted, and a correction coefficient K is generated based on the transmission rate ratio N.
- N is 1 and the correction factor is also 1.
- the transmission speed ratio N is 0.5, which is lower than the standard, for example, the correction coefficient K of the PCR is 2.
- the correction coefficient K is 0.5.
- the time at which the calculated separation time P c is measured is 1 which is the transmission speed ratio N of the separation time Pa, so the PCR correction coefficient K is expressed by the following equation (4) Then, the reciprocal of the transmission rate ratio N is obtained.
- the ⁇ 1 corrector 520 0 corrects the PCR input from the PCR extractor 510 ⁇ with the correction coefficient input from the C regenerator 500 ⁇ . That is, the PCR value is multiplied by K to generate a corrected program clock reference PCRc, I do.
- the n-th packet TSP (n) is assigned to the n-th packet TSP (n).
- (I-1) -th time information of the PCR (i-1) is included.
- P including PCR (i-1).
- the packet TSP (n) and the packet TSP (n + ⁇ ) located after a separation time Pa (i) within 100 ms have an i-th PCR that indicates the time. (i) has been granted.
- PCR (i) is the reference time T [PCR
- (i-1-1)] represents a reference time T [ ⁇ CR (i)] after the separation time Pa (i) from the car.
- the PCR (i) corrects the separation time Pa (i). Correction separation time multiplied by coefficient K ⁇ ⁇ Correction reference time after P a (i) T [PCR c
- the packet TSP (n + a + ⁇ ) is assigned the (i + 1) th PCR (i + 1).
- the PCR (i + 1) indicates the corrected reference time T [PCRc (i + 1)].
- the packet TSP (n + a + ⁇ + y) is assigned the (i + 2) -th PCR (i + 2).
- the PCR (i + 2) indicates the correction reference time T [PCRc (i + 2)].
- a program clock clip that describes four packets TSP (n) to TSP (n + a + ⁇ + y) belonging to the bucket group that constitutes one program The above-mentioned relationship between the reference PCR and the packet TSP also holds for the packet TSP after the packet TSP ( ⁇ + ⁇ + ⁇ + y), and similarly constitutes another program. No. This is also true for the bucket TSP belonging to the bucket group.
- the PCR corrector 520 when the packet TSP (n) is input to the storage-type data receiver SDR1, as a result of the above processing, the PCR corrector 520 generates PCR c (i-1). Then, it is input to the comparator 110.
- the controller 260 sets the value of PCR c (i-1) as the initial value of the system clock counter 115.
- STC (i-) having the same time value as PCR c (i-1) 1) is output.
- the value of PCR c detected first is set as the initial value of the system clock counter 115, and thereafter, the value of PCR c for each i is set.
- V d P (i — 1) is zero-volt.
- the VCXO l4O4 transmits the clock transmitted with the VCXO l0 40 initial setting clock (27 MHz).
- Lock signal SF (V dp) V dp
- (i-1)) is output to the system clock counter 1150 and is output to the program extractor 210 as an STC. .
- the system clock counter 1150 sequentially counts the pulses of the input clock signal SF (Vdp (i11)), and simultaneously counts the pulses.
- the count value is accumulated at the initially set PCR c (i-1) time, and the system clock time T [STC], which is the time represented by the STC, is sequentially generated and the data is generated. Output to 1 1 1 0
- FIG. 2 exemplifies a case where the transmission frequency of VC XOL 140 is higher than an appropriate value.
- the STC (i-1) power is set to PCR c (i-1), so that the control voltage Vd of VCXO 114 0 is set.
- P (i-1) is zero.
- the frequency clock signal F (Vdp (i-1)) of the output clock signal SF (Vdp (i-1)) is set to the reference oscillation frequency of the VCXOl140.
- the wave number (for example, 27 MHz).
- This VCX 0 1 1 4 0 has a higher reference transmission frequency than the PCR of the transport stream TS input to the storage type data receiver SDR 1. You. As a result, the number of counts counted by the system clock counter 1 150 within the corrected separation time KPa (i) C (KPa (i) ZF (V dp (i))) is more than the appropriate value.
- the system clock time T [STC (i)] measured within the corrected separation time K ⁇ Pa (i) is more than the corrected reference time T [PCR (i)]. They differ by only the lock difference ⁇ ⁇ (i).
- the correction reference time T [PCR c (i)]] is advanced by the clock difference P (i). In this way, when the STC reproduced from the PCR (PCR c) is not synchronized with the reproduction source PCR (PCR c), the accumulation type data receiver SDR1 operates correctly. do not do.
- the clock difference ⁇ P (i + 1) between the correction reference time T [PCRc (i + 1)] and the system clock time T [STC (i + 1)] is Although it is smaller than the previous clock difference P (i), it is still a negative value. Therefore, the VCXO 114 0 is controlled by the negative control voltage VdP (i + 1) whose absolute value is smaller than the control voltage VdP (i), so that the reference transmission frequency ( (7 MHz), but has a frequency F (V dp (i + 1)) that is smaller than the previous frequency F (V dp (i)).
- the shock signal SF (Vdp (i + 1)) is output as STC (i + 1) from the SVCXO1140 output.
- the clock difference ⁇ P (i + 2) between the correction reference time T [PCRc (i + 2)] and the system clock time T [STC (i + 2)] is It becomes even smaller than the previous clock difference ⁇ ⁇ (i + 1), and becomes a positive value. That is, the system clock time T [STC (i + 2)] is more than the correction reference time T [PCRc (i + 2)] and the clock difference ⁇ ⁇ (i + It is calculated that it is late by 2). This occurs because the transmission frequency of the VCXO1140 is set lower than the appropriate value. In this case, the absolute value of the clock difference ⁇ P (i + 2) is smaller than the absolute value of the clock difference ⁇ P (i + 1), and The degree of deviation has been improved.
- CXO 1 1 4 0 is absolute value from control voltage V d P (i + 1) Due to the positive control voltage VdP (i + 2), which is slightly lower than the reference oscillation frequency, the previous cut-off signal SF (Vdp (i + 1)) Force with large frequency F (Vdp (i + 2)); Clock signal SF (Vdp (i + 2)) force SVCXO 114 4 force STC (i + 2) Is output as
- the STC to be reproduced will have a corrected program clock reference (PCRc).
- PCRc reference clock
- the control voltage ⁇ (1?) Of ⁇ 0 1 1 4 0 converges correctly, and finally the correction reference time T [PCR c] And the system clock time T [STC] match, that is, the reference clock time ij ij T [PCR] and the system clock time T [STC] force; Then, the STC synchronized with the PCR is reproduced.
- the PCR (i) is corrected based on the transmission speed ratio N of the transport stream TS.
- the transmission rate ratio N is other than 1
- the system time clock STC can be correctly reproduced based on the original PCR.
- the PCR c (i) generated from the first correctly read PCR (i) input is set to the initial value of the system clock counter 115. By doing so, the ability to correctly extract the PCR from the bucket TSP will be sufficient; if any, the following PCR will be required to correctly extract the PCR from the bucket TSP. Since the feedback processing of the above is established, the reproduction of the STC can be continued.
- the above-mentioned feedback processing is established, and the STC can be correctly reproduced.
- the time indicated by the PCR (i) and the time indicated by the PCR c (i) with the internal time of the accumulation type data receiving device SDR c, the time is converted into the actual transmission / reception time. It can be used for various processes.
- the program extractor 210 Based on the STC input from the STC reproducer 500, the program extractor 210 transmits the transport port stream input from the transmission path decoder 100, based on the STC input.
- the generated secondary transport stream TSs is recorded in the data accumulator 200.
- the selector S1 linked by the controller 260 the PCR correction coefficient generator 500, the PCR extractor 5001, and the program extraction are performed.
- the storage device 210 is connected to the data storage device 200.
- the selector S2 disconnects the data storage device 200 from the program extractor 210.
- the selector S3 disconnects the connection with the PCR corrector 5002tt TTPC correction coefficient generator 5000.
- the secondary trans- port stream TSs is read from the data accumulator 200, and the PCR correction coefficient generator 500,. Scale extractor 501 and program extractor 210 Entered. Since the connection between the PCR correction coefficient generator 500 and the PCR corrector 502 is cut off by the selector S3, the PCR correction coefficient generator 50 The correction coefficient K generated at 0 0 is not input to the PCR corrector 520.
- the separation time Pa (i) is correct.
- the STC is played back correctly.
- the program recorded in the secondary transport stream Tss is extracted and output to the video decoder 230.
- the secondary transport stream TSs input to the program extractor 210 and the secondary extractor that the program extractor 210 extracts and outputs
- the trans- port stream TSs is the same.
- the storage type data receiver SDR1 As described above, in the storage type data receiver SDR1, it is different from the case where the once created transport port stream TS is created or scheduled to be transmitted / received. Even if it is transmitted and received at the time (date and time), the STC can be correctly reproduced from the secondary transport stream TS s that has been recorded and accumulated.
- STC playback can be performed normally even when receiving a program transmitted at a nonstandard transmission speed (transmission speed ratio N is not 1). It will be possible.
- transmission speed ratio N transmission speed ratio
- the PCR information that is added to the stream of the same program and used as it is is used as it is. This allows the program to be played back normally.
- the program clock As a result of the failure of the reference PCR extraction, even if the transmission speed ratio N is 1 in the past, the feedback processing power between two consecutive PCRs was low. Without this, it becomes impossible to play the STC. Even in such a case, in the present embodiment, based on the transmission rate ratio N given to the transport port stream TS, the recently extracted PCR and the current time point are used. This allows feedback processing with the PCR extracted in step 2.
- the transmission rate ratio adder SDS is composed of a transport port stream accumulator (hereinafter abbreviated as “TS accumulator”) 100 0, a transmission rate ratio input device 1 0 0 1 0 , Service information separator (hereinafter abbreviated as “Si separator”) 1002, descriptor information adder 1003, and difference service S information remultiplexer (hereinafter abbreviated as “Si remultiplexer”).
- TS accumulator transport port stream accumulator
- Si separator Service information separator
- descriptor information adder 1003 descriptor information adder
- Si remultiplexer difference service S information remultiplexer
- the T S accumulator 100 000 is composed of a hard disk or the like, and accumulates a transport stream T S prior to transmission.
- the transmission speed ratio input device 100001 inputs the transmission speed ratio N when the transmission side actually transmits the transport stream TS.
- the transmission speed ratio input device 1 0 0 1 0 stores the transmission speed ratio N instructed on the transmission side by the TS accumulator 1 00 0 0 0 and the descriptor information addition device 1 0 0 3 0 Enter in.
- the TS accumulator 1 00 00 0 stores the stored data at the specified transmission rate ratio N.
- the port stream TS is output to the Si separator 1 0 0 2 0 and the Si remultiplexer 1 0 0 4 0.
- the Si separator 1 0 0 2 0 is a PMT (Program Map Table) which is one of the service information S i of the input transport stream stream S.
- PMT Program Map Table
- One layer extracts region data that is released to the user and is represented by EIT (Event Information Table).
- EIT Event Information Table
- the Si separator 100 0 20 extracts the PMT from the transport stream TS and outputs it to the descriptor information adder 1 0 0 3 0 You.
- the descriptor information adder 1 0 0 3 0 inputs the PMT input from the Si separator 1 0 0 2 0 input to the PMT input from the transmission rate ratio input 1 0 0 0 0 input.
- the transmission rate ratio N is written, PMT 'is generated, and output to the Si remultiplexer 10040.
- the S i remultiplexer 1 0 0 4 0 receives the PM information input from the descriptor information adder 1 0 0 3 0 output from the TS accumulator 1 0 0 0 0 input.
- a transport port stream TS is generated by overlapping the transport port stream TS '. As described above, the transport stream stream TS 'and the transport port stream TS have the transmission rate ratio N assigned to the PMT. Except that they are the same.
- the transmission side transmits the transmission speed to the transport port TS.
- the transmission rate ratio N of the bucket TSP of the program to be stored on the receiving side is calculated instead of transmitting the program by embedding the frequency ratio N, and the program port is calculated based on the calculated value. It corrects the reference PCR and reproduces the system timing STC correctly.
- the storage-type data receiver SDR2 has the PCR correction coefficient generator 5000 removed from the storage-type data receiver SDR1 shown in Fig. 1, and the PCRr extractor 5005 A correction coefficient calculator 600 is newly provided.
- the PCR r extractor 501 is configured in the same manner as the PCR extractor 510 described above, but differs in the PCR extraction target. That is, the PCR extractor 510 extracts PCR from the bucket TSP of the selected program to be stored by the user. However, the PCRr extractor 5005 extracts PCRs from packets TSP of standard transmission speed (transmission speed ratio N is 1) for programs that the user has not selected to store.
- transmission speed ratio N is 1
- the PCR correction coefficient calculator 6000 calculates the program to be stored based on the PCR input from the PCR extractor 510 and the PCRr input from the PCRr extractor 510. Bucket T The transmission rate ratio N of the SP is calculated, and a correction coefficient K is generated based on the calculated transmission rate ratio N.
- the PCR correction coefficient calculator 600 is the same as the PCR correction coefficient generator 500 described above in that the correction coefficient K is extracted.
- the PCR correction coefficient generator 5000 reads the transmission rate ratio N embedded in the bucket TSP of the program to be stored from the power S, the PCR correction coefficient calculation is performed.
- the transmission rate ratio N is calculated on the basis of the PCR of the selected program and the PCRr of the non-selected standard transmission rate program included in the transport stream TS. Very different. Otherwise, the configuration and operation of the type data receiver SDR2 are the same as those of the storage type data receiver SDR1 described above.
- PCR r extractor 500 1 15 Output from the standard program clock reference between the PCR r and the reproduced system time clock STC Has the relationship described with reference to FIG. That is, the calculated separation time Pc (i) C (Pa (i) / F (Vdp (i-1))) represented by the above equation (2) is established.
- the calculated separation time Pc (i) of the standard program clock reference PCR r is set to the program clock reference.
- the correction coefficient K can be obtained by dividing by the calculated separation time Pc (i) of the PCR.
- the PCR correction coefficient calculator 6001 first calculates the separation time of the standard program clock reference PCRr input from the PCRr extractor 501 PCR r (i) which is P rc (i)-PCR r (i-1) is obtained.
- the PCR correction coefficient calculator 6000 calculates the program clock reference PCR to be input from the PCR extractor 50010 and calculates the calculated separation time P rc (i ) Is obtained as PCR (i) — PCR (i — 1).
- the PCR correction coefficient calculator 600 calculates the correction coefficient K based on the following equation (6).
- transmission speed ratio N is not 1
- the transponder is still more active. There is no need to add the transmission rate ratio N to the stream TS.
- the transmission rate ratio N be an integer value, but it is not necessary to be an integer value. That is, the transmission rate ratio N may be any of a plurality of values different from each other by a predetermined amount.
- the predetermined amount will be described below.
- the program clock reference on the sending side The frequency of the clock for the PCR and the frequency of the clock for the STC on the receiving side are f-PCR and f-STC, respectively.
- the ratio R f — PCRZ f _ STC and the maximum value of the correction coefficient K (1 / N) is Kmax.
- the transmission side does not embed the transmission speed ratio N in the transport port stream TS and transmits the packet.
- the point that the transmission rate ratio N of the TSP is calculated is the same as in the above-described second embodiment.
- the transmission rate ratio N is calculated by comparing the PCR with the STC, and the program clock is calculated based on the calculated value. It corrects the reference PCR and reproduces the system time clock STC correctly.
- Stored data receiver SDR 3 Are the selectors S3,? 3 from the storage type data receiver SDR2 shown in Fig.4. 1: 1: The extractor 50015 and the PCR correction coefficient calculator 600000 are deleted, and the selector S4 and the STCZPCR speed ratio calculator 700000 are newly installed. It is composed and constructed.
- the selector S4 is controlled by the controller 260 to interrupt the output port of the STCZPCR speed ratio calculator 7000 and the input port of the PCR corrector 520. .
- the PCR corrector 502 is always connected to the three-way regenerator 500.
- the three-to-one speed ratio calculator 7000 is a program clock reference input from the PCR extractor 510 and the PCR and STC regenerator 500 Based on the input system time clock STC, the PCR value extracted from the bucket TSP of the selected program and the playback inside the storage type data receiver SDR3 A ratio R of the calculated STC value is calculated, and a correction coefficient K is generated based on the calculated ratio R.
- the PCR corrector 520 receives the program clock reference PCR input from the PCR extractor 510 through the selector S4. Then, a correction program Kc is generated by correcting with the correction coefficient K input from the STCZPCR speed ratio calculator 700 to generate a corrected program clock reference PCR c. Output to 0.
- the storage-type data receiver SDR 3 has the same configuration and operation as the storage-type data receiver SDR 1 and the storage-type data receiver SDR 2 except for the calculation of the PCR / STC ratio R. And same Therefore, only the operation of the five-to-one speed ratio calculator 700 will be described below.
- the operation of the STCZPCR speed ratio calculator 700 will be described with reference to FIG.
- the PCR output from the PCR extractor 510 and the system time clock STC output from the STC regenerator 500 are described with reference to FIG.
- the calculated separation time Pc (i) C (KPa (i)) / F (Vdp (i-1)) corresponding to the system opening time T [STC]. Holds. Therefore, the calculated separation time P c (i) is divided by the separation time P a (i) corresponding to the reference time T [PCR] shown in FIG.
- the coefficient K can be obtained.
- the correction coefficient K can be obtained every time PCR is input, based on the ratio between STC and PCR.
- the transmission side it is necessary for the transmission side to add the transmission speed ratio N of the non-standard transmission rate program to the transport port stream TS.
- the system time clock is not required based on the difference between two or more consecutive PCRs.
- the STC can reproduce. Therefore, the transmission rate of a program at a non-standard transmission rate can be changed in units of a PCR insertion interval into the transport port stream TS.
- the transport port stream on the transmitting side is different from that of the first, second, and third embodiments.
- the transmission rate ratio N embedded in the TS and transmitted nor is the reception side calculating the transmission rate ratio N of the bucket TSP of the selected program.
- the system is based on the program clock reference PCR of the program transmitted and received at the standard transmission rate in the transport port stream TS.
- the system time clock STC is played back, and the system time clock ST that has been played back processes the bucket TSP of the program selected for accumulation. Is Umono .
- the storage-type data receiver SDR4 is composed of the storage-type data receiver SDR1 shown in FIG. 1 and the selectors S3 and STC regenerators 500 and? 1 Corrector 5 0 0 0 0; In addition to being removed from IJ, a selector S 5 and a PC R r designator 8 00 0 are newly provided and configured.
- the scale extractor 50010 is always connected to the 3-joint regenerator 500. Note that the selector S5 interrupts the output port of the PCR correction coefficient generator 500 and the input port of the PCR extractor 501.
- the storage type data receiver SDR 4 is the same in configuration and operation as the storage type data receiver SDR 1 described above, except for the detection of the standard program port and the reference PCR r. Is the same The operation of the PCR r designator 800 and the PCR extractor 510 will be briefly described below.
- the controller 260 transmits the other program included in the transport stream TS at a standard transmission rate (transmission rate ratio N is 1).
- a PCR r extraction instruction signal Se of a PCR (that is, PCR r) of a program to be transmitted / received is generated.
- the PCR extractor 50010 receives the program at the standard transmission rate based on the PCRr extraction instruction signal Se input from the PCRr designator 8000 via the selector S5. Extract the PCR.
- This PCR is different from the PCR of the storage selection program, and is the same as the PCRr defined in the above-described second embodiment. Therefore, in the present example, the PCR extractor 50010 detects the PCRr based on the designation (Se) of the PCRr designator 8000 and sends it to the STC regenerator 500. Output.
- another program transmitted at the normal transmission speed designated by the PCRr designator 800 is forced Q to be transmitted.
- Extract PCR information standard program clock reference PCR r.
- the PCR transmission rate ratio N is not 1
- the PCR transmission rate ratio N is not 1
- the PCR transmission rate ratio N is not 1
- the STC can be normally reproduced from a non-standard transmission rate program, and the same program is reproduced from the data storage device 200.
- the program can be played back normally by using the PCR information attached in the stream of the program as it is.
- the PCR value in the same set is transmitted from the transmission side to the PCR value.
- the coefficient is calculated based on the previously transmitted transmission speed cost information, or the transmission speed cost information is automatically calculated on the receiver side.
- the STC can be normally reproduced from a low-speed transmission rate program card, and when the same program is reproduced from a recording device card, it is added to the stream of the same program. If the PCR information is used as it is, the program can be played back normally.
- the present invention relates to a storage-type data broadcasting service system, in which a transport port stream TS is distributed to a transmission path. Related resources can be used effectively.
Description
Claims
Priority Applications (1)
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EP01921865A EP1280346A1 (en) | 2000-04-24 | 2001-04-18 | Data broadcasting service system of storage type |
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US (1) | US20030018983A1 (ja) |
EP (1) | EP1280346A1 (ja) |
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US7711856B1 (en) * | 2004-09-30 | 2010-05-04 | Avaya Inc. | Method and apparatus for providing an interface for a messaging mailbox |
US20060080433A1 (en) * | 2004-10-11 | 2006-04-13 | Umberto Caselli | Method and system for delivering information with optimized pre-fetching |
US20080123732A1 (en) * | 2006-11-27 | 2008-05-29 | Rajesh Mamidwar | Method and system for configuring decoding based on detecting transport stream input rate |
JP4506879B2 (ja) * | 2008-06-09 | 2010-07-21 | ソニー株式会社 | 記録装置、記録方法、プログラム及び記録システム |
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- 2001-04-18 EP EP01921865A patent/EP1280346A1/en not_active Withdrawn
- 2001-04-18 US US10/018,752 patent/US20030018983A1/en not_active Abandoned
- 2001-04-18 WO PCT/JP2001/003300 patent/WO2001082603A1/ja not_active Application Discontinuation
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JP2002016561A (ja) * | 2000-04-24 | 2002-01-18 | Sony Corp | 情報送信装置及び方法、情報端末装置及び情報端末受信方法、ディジタル放送受信装置及び方法、並びに、出力時間演算装置及び方法 |
JP2008061150A (ja) * | 2006-09-04 | 2008-03-13 | Hitachi Ltd | 受信機及び情報処理方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1280346A1 (en) | 2003-01-29 |
US20030018983A1 (en) | 2003-01-23 |
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