CN1327681A - Recording of a trick signal on a record carrier - Google Patents
Recording of a trick signal on a record carrier Download PDFInfo
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- CN1327681A CN1327681A CN00802303A CN00802303A CN1327681A CN 1327681 A CN1327681 A CN 1327681A CN 00802303 A CN00802303 A CN 00802303A CN 00802303 A CN00802303 A CN 00802303A CN 1327681 A CN1327681 A CN 1327681A
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2387—Stream processing in response to a playback request from an end-user, e.g. for trick-play
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/783—Adaptations for reproducing at a rate different from the recording rate
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/005—Reproducing at a different information rate from the information rate of recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
- G11B27/3063—Subcodes
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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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
- H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
- H04N9/8227—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal the additional signal being at least another television signal
Abstract
A recording apparatus for recording a first information signal, comprising packets of information (114) and a trick play signal comprising packets of information (116) comprise a time stamp generator (147) for generating time stamps for the packets. The first digital information signal is meant for a reproduction at a record carrier speed which equals the recording speed and the second digital signal is meant for a reproduction at a speed n1 times the recording speed. The time stamp generator derives said time stamps for the packets of said second information signal from the sync block numbers for the second sync blocks in which those packets are stored.
Description
The present invention relates to the equipment of record first and second digital information signals on the magnetic track of record carrier, described first and second digital information signals are the information signals that comprise the continuous information bag, and described equipment comprises:
-input unit is used to receive first and second digital information signals;
-signal processing apparatus, be used for first and second digital information signals are processed into first tracer signal and first trick play signal that is suitable at the enterprising line item of magnetic track of described record carrier respectively, described signal processing apparatus is suitable for producing synchronous information block, the synchronization blocks of first tracer signal comprises the information byte of synchronization character, synchronization blocks number and many first digital information signals, so that is included in information stores in x the transport packet in the first information signal in individual first synchronization blocks of y at every turn;
The synchronization blocks of first trick play signal comprises the information byte of synchronization character, special play-back synchronization blocks number and many second information signals, so that is included in information stores in x the transport packet of second information signal in individual second synchronization blocks of y at every turn;
-synchronization blocks generating apparatus is used to produce the described synchronization blocks number that is attached to described first synchronization blocks, and is used to produce the described special play-back synchronization blocks number that is attached to described second synchronization blocks;
-time mark generator device, be used to produce the time mark of the described transport packet of described first and second digital information signals, described signal processing apparatus also is suitable for the described time mark in conjunction with the described transport packet in the synchronization blocks of described first tracer signal and described first trick play signal;
-signal combination device is used for first and second synchronization blocks are combined into composite signal;
-writing station, be used for composite signal being write on magnetic track with the booking situation speed of record carrier, writing station comprises first and second write heads that are positioned on the rotatable head drum, described first magnetic head has the first party parallactic angle and described second write head has the second party parallactic angle different with the first party parallactic angle, first digital information signal is illustrated in the reproducing device playback with the playback speed that equals writing speed, and second digital information signal is represented to equal described writing speed n
1The playback of trick play speed doubly, wherein n
1Be to be not equal to 1 integer, x and y are the integers that satisfies x 〉=1 and y 〉=x, and the maximum common denominator of x and y is 1.From with the corresponding International Patent Application WO 98/34227-A3 of U.S. Patent application No.09/155724 (PHN 16252) of on February 2nd, 1998 application so as can be known recording equipment.
Known equipment shows as the digital video recorder (digital videorecorder) of recording digital video signals.Digital video signal can be the mpeg coded video signal, and wherein the packets of information of digital video signal is included in the serial data stream of mpeg coded video signal.Except this mpeg coded video signal, trick play signal can also be recorded on the magnetic track of record carrier.Such trick play signal can be identical vision signal, but record carrier (special play-back) speed playback to be different from the nominal playback speed.Usually, separate data stream is recorded on the record carrier as trick play signal, makes to reset with this trick play speed.Can obtain trick play signal from the mpeg coded video signal, for example by from the mpeg coded video signal, selecting the I frame.
Yet, this trick play signal not necessarily with the related trick play signal of mpeg coded video signal, and can be diverse signal., in the mode identical with the mpeg coded video signal, the serial data stream of trick play signal comprises the packets of information of trick play signal.
Above-mentioned document description all be recorded in the time mark that comprises in the packets of information in the serial data stream on the record carrier, so that the correct serial data stream of regenerating information bag, have correct mutual timing relationship between the continuous information bag in serial data stream, so that might in mpeg decoder, be correctly decoded.In order to realize this purpose, utilize counter to come the generation time mark.
The objective of the invention is a kind of recording equipment that is used to write down one or more trick play signal of suggestion, it can produce all time marks of the packets of information that is used for those signals by different way.
Be characterised in that according to recording equipment of the present invention: the time mark generator device is suitable for obtaining the described time mark of the packets of information of described second information signal from the special play-back synchronization blocks of second synchronization blocks number.
The present invention is based on following approval.
Service time, mark was well-known in the art.In chain certain is a bit carried out time mark to the MPEG bag, so that can be along chain and the original timing relationship of reconstruct down, and no matter the timing of all kinds of its point-to-point transmission changes (packets of information moves).Time mark also is used to correct the timing jitter in the storage device.In this case, the input at storage device is made time mark before the record to mpeg stream.When playback, time mark is used for sending it to decoder or some other devices then at the output reconstruct primary flow of storage device.
The real-time time mark plays extraordinary effect to normal play, and special play-back is more had problem.This be because: concerning the special play-back data, the record and playback between have speed difference.Playback speed is n a times of writing speed.During playback, should be that MPEG complies with at the timing relationship of the stream of storage device output.Preferably use and the same technology of technology that is used for normal play, promptly special play-back MPEG bag is stored with time mark., owing between record and playback, have speed difference, be difficult to be used for this purpose real-time mark counter.Also must consideration may there be more than one special trick play stream in we, and some of them are used for reverse trickplay stream.This makes time mark complicated more.
But, in fact unique requirement be exactly the special play-back output stream be MPEG comply with and decodable.And the special play-back data are not simply to import data, but in order to reduce bit rate and described input data transaction to be become the special play-back data and the input data revised.Therefore, provide one or more special play-back generators for this conversion.This also means and really need not to be the real-time time mark, because because the special play-back conversion, in any case lost and the primitive relation of input data.Can more intelligently before record, finish the time mark of special play-back bag by simple operation.By this way can be at an easy rate to all trick play stream marks unified time.Use the special play-back synchronization blocks to be convenient to more flexibly data map and not depart from this unified method as this calculating starting point.The special play-back output stream only need be that the approval that MPEG complies with also causes the packets of information distance of this stream to need not constant conclusion.This is convenient to all straightforward procedures the special play-back synchronization blocks number is transformed into time mark, is easy to realize in the hardware with low gate circuit expense.
With reference to the accompanying drawings to the description of embodiment, these and others of the present invention will obviously and be illustrated by hereinafter.
In the accompanying drawing:
Track format in the grouping of Fig. 1: a P magnetic track, wherein P equals 48, and the paths of passing record carrier that two playback heads are followed the tracks of under the first special play-back manner of playback, and wherein the speed of record carrier+4 are times to datum speed;
Fig. 2: the content of magnetic track on the record carrier;
Fig. 3: the form of synchronization blocks;
Fig. 4: the form of the data header part in Fig. 3 synchronization blocks;
Fig. 5: two continuous synchronization pieces that wherein store the MPEG bag;
The content of the packet header in the first continuous synchronization piece in two continuous synchronization pieces of Fig. 6: Fig. 5, wherein packet header comprises time mark;
The content of the packet header in the first special play-back synchronization blocks in two continuous special play-back synchronization blocks of Fig. 7: Fig. 5, wherein packet header comprises the time mark of the packets of information of the special play-back data flow that is used for packets of information;
Fig. 8: the relation between special play-back synchronization blocks number and the special play-back time stamp value;
Fig. 9: when using the time mark algorithm of describing with reference to figure 8, with the starting point of special play-back manner of playback playback duration special play-back packets of information;
Figure 10: according to the embodiment of recording equipment of the present invention; And
Figure 11 and Figure 12: number obtain two of time mark (mutually) diverse ways in addition from the special play-back synchronization blocks, they cause identical time stamp value.
Fig. 1 illustrates the track format that is recorded in the magnetic track on the record carrier 1.This magnetic track is by coming record with respect to the angle of inclination of record carrier warp-wise.Yet, in Fig. 1, for clarity sake, magnetic track is shown with the angle radially of crossing record carrier 1.Can on record carrier 1, identify P the grouping of magnetic track continuously.P such grouping of magnetic track continuously has been shown among Fig. 1, and wherein P equals 48 in this example.During recording/reproducing, by from Fig. 1 bottom to the top and the direction from the left part to the right part write/read magnetic track.
The track format of Fig. 1 is extremely similar among track format shown in Fig. 1 and the International Patent Application WO 98/34227-A3.Be with the difference of the track format of Fig. 1 among the WO98/34277-A3: under the special play-back manner of playback, the quantity of the special play-back synchronization blocks of reading during head drum rotates a circle is 112 at present, wherein 102 special play-back synchronization blocks comprise the packets of information of 51 special play-back information signals, and 10 remaining special play-back synchronization blocks comprise parity information.The track format of Fig. 1 allows the special play-back of various speed, such as one group of trick play speed 4x, 12x, 24x with and reversing speed.
Fig. 2 illustrates the form of a magnetic track.Among the figure with from left to right direction record with read magnetic track.In this example, the length of each track portion among Fig. 2 is represented with main synchronization blocks numeral.Wherein the length of main synchronization blocks is 112 bytes, each byte 8 bit.
At first, the clock introducing part 2 that indicates " edge " is recorded, and is two main synchronization blocks length in this example.Then, follow the preamble portion 3 of 3 main synchronization blocks length.And then the subcode signal recording section 4 of preamble portion 3 is 4 main synchronization blocks length.Subcode signal recording section 4 is used to write down subcode signal.Wherein, subcode signal can comprise absolute and/or relative time information and contents table.
Then, and then the indicating of 5,3 main synchronization blocks length of postamble part of 3 main synchronization blocks length " IBG ' edit gap 6 and be the preamble portion 7 of 1 main synchronization blocks length in this example.Then, follow the auxiliary signal recording section 8 that indicates " AUX " of 23 main synchronization blocks length.As an example, auxiliary signal recording section 8 is used to write down the auxiliary signal such as text data.This auxiliary signal recording section 8 with the indicating of 9,3 main synchronization blocks length of postamble part that 2 main synchronization blocks length are arranged " IBG ' edit gap 10 and the preamble portion 11 of 1 main synchronization blocks length.Follow the information signal recording part 12 that indicates " main data area " of 307 main synchronization blocks length then.Information signal recording part 12 is used for the digital-information recording signal.A digital information signal can be digital video signal and/or the digital audio and video signals that has been encoded into mpeg information signal.In addition, the special play-back data can be included in the information signal recording part 12.Information signal recording part 12 can be imagined upward separated into two parts: the 12a of first of 277 main synchronization blocks length and the second portion 12b of 30 main synchronization blocks length.Second portion 12b comprises the external ECC parity information.
Information signal recording part 12 is with postamble part 13 and another " edge " part 14 that 2 main synchronization blocks length are arranged, and latter's length is incoherent, but for this example, can be assumed to be 2 main synchronization blocks length.Like this, magnetic track comprises 356 main synchronization blocks altogether.
Be noted that at this auxiliary signal recording section 8 chooses wantonly, in another kind of recording mode, do not write down auxiliary signal on the magnetic track, and comprise that the recording section 8 of part 9,10 and 11 adds information signal recording part 12 to and is filled with main information.
Get back to Fig. 1, will further describe the content of the 12a of first of information signal recording part 12.Fig. 1 illustrates the magnetic track that utilization at least the first and second write heads have write down.First magnetic head and first party parallactic angle are gapped, and second magnetic head and be different between the second party parallactic angle of first party parallactic angle gapped.Use from the lower left corner of figure by the magnetic track of first write head record and to represent, use from the lower right corner of figure by the magnetic track of second write head record and represent, see that label among Fig. 1 is 20 circle to the oblique line in the upper left corner of figure to the oblique line in the upper right corner of figure.
May comprise first information signal record that MPEG transmits the stream information bag in magnetic track, more particularly, in the information signal recording part 12 of magnetic track.In the embodiment of the tape deck of helical scan type digital VTR form, first information signal can be " normal play " data that are recorded in the magnetic track, be used for according to record during the identical record carrier speed of record carrier speed reset at replay device.This speed definition is a nominal record carrier speed.Above-mentioned first information signal packet is contained in the main synchronization blocks.
In addition, second information signal has been recorded in the specific part of magnetic track.In Fig. 1, those parts represent that with label 22.i (+4) wherein i from 1 to 12.Second information signal is used at reproducing device with 4 times of playback speed forward playback to the nominal playback speed.Second information signal also can be and the above-mentioned first information signal information signal that it doesn't matter.Second information signal can be relevant with first information signal, second information signal is the trick play signal that is used for 4 times of nominal playback speeds, so that obtain (video) signal of resetting, this signal is the duplicate of playback first (video) signal, yet with 4 times of datum speed forward playback.
Fig. 1 also illustrates 4 scan lines 24.1,24.2,26.1,26.2.Double-head arrow scan line 24.1 and 24.2 shows such path: the magnetic head with first party parallactic angle passes through record carrier in 4 times of nominal playback speed modes during head drum rotated for 2 weeks.Single arrow scan line 26.1 and 26.2 shows such path: another magnetic head with second party parallactic angle passes through record carrier in 4 times of nominal playback speed modes during head drum rotated for 2 weeks.As shown in Figure 1, a magnetic head reads special play-back part 22.i (+4), and wherein i is an odd number, and another magnetic head reads special play-back part 22.i (+4), and wherein i is an even number.
In this example, special play-back part 22.i (+4) each the length of 56 special play-back synchronization blocks is all arranged.51 special play-back synchronization blocks in 56 special play-back synchronization blocks in part have about being stored in the information content of the special play-back information in those synchronization blocks, and those synchronization blocks may comprise " puppet " synchronization blocks that hereinafter will describe.The special play-back synchronization blocks of other 5 in part comprises the parity information that obtains by the ECC coding step to the special play-back information and executing.Like this, during whenever the rotating a circle of head drum, when 4 times of nominal manner of playback, read 102 special play-back synchronous information blocks of second information signal from record carrier, it comprises 51 special play-back information signal bags.
Fig. 1 track format is not done more descriptions because these descriptions be according to International Patent Application WO 98/34227-A3 in the description same procedure of Fig. 1 carry out.But, as general standard, we can say, to each trick play speed, always having 112 special play-back synchronization blocks is read during head drum rotates a circle, 102 packets of information that comprise 51 trick play signals in 112 special play-back synchronization blocks, and other 10 special play-back synchronization blocks comprise parity information.
112 special play-back synchronization blocks that read during head drum rotates a circle have special play-back synchronization blocks number and are numbered 0 to 111, the order of the order of its numbering for during head drum rotates a circle under the special play-back manner of playback these special play-back synchronization blocks being read, wherein special play-back synchronization blocks 0 is the first special play-back synchronization blocks that is read by the magnetic head with first party parallactic angle.The count word of 0 to 111 special play-back synchronization blocks needs 7 bit long is expressed as TPSB#.
Each all has the special play-back time mark packets of information of 51 trick play signals storing in 102 special play-back synchronization blocks in these special play-back synchronization blocks.This special play-back time mark is well-known in the art.According to following Fig. 7 that will describe, the special play-back time stamp value of each packets of information is stored as 2 bit TSH ' and 18 bit TSL values.
Then the form of special play-back synchronization blocks will be discussed with reference to figure 3.The special play-back synchronization blocks has the identical length of other synchronization blocks in the main data area that stores first digital information signal 12 with Fig. 1.Synchronous block length 112 bytes of special play-back also comprise that the synchronization character of 2 byte longs, the identification division 60 that is expressed as ID, the title division 61 that is expressed as " main title ", the auxiliary byte 62 that is expressed as " auxiliary data " and length are the data field 64 of 104 bytes.Data field 64 has the space of the parity check of the trick play signal data (the 2nd to the 7th information signal in) of storage 96 bytes and 8 bytes.
Fig. 4 shows two bytes 70 and 71 in the main title district 61 of Fig. 3.The b of the byte 72 in main title district 61
0To b
6Bit can be used to store the synchronous number TPSB# of determining of special play-back.
The time mark of special play-back synchronization blocks will be discussed then.Time mark is well-known in the art.This respect is with reference to U.S. Patent application US5579183 (PHN 14818) and International Patent Application WO 96/30.905 (PHN 15260).Document description on record carrier record MPEG bag, wherein the MPEG bag adds time mark and writes down this bag continuously once reaching.At playback time, read bag from record carrier, from bag retrieval time mark and be used for constantly bag being provided to output correct.
The MPEG that Fig. 5 shows 188 byte longs transmits packets of information is how to be stored in two continuous synchronization pieces, more particularly, is stored among the data field 64a of two continuous synchronization pieces.At first, the packet header 75 of 4 byte longs is stored in two synchronization blocks and is expressed as SB
nThe data field 64a of first synchronization blocks in.Then, the MPEG of 92 bytes bag is stored in synchronization blocks SB
nThe remainder of data field 64a.Remainder 96 bytes store of MPEG bag are at the second synchronization blocks SB
N+1Data field 64a in.The time mark of corresponding transport packet is stored in the packet header 75.This is shown in Figure 6.More accurately, the time mark of " normal play " data is grown 22 bits and is stored in last 22 bits of packet header 75.
The 22 bit time marks of " normal play " data are divided into TSL (time mark is low) part and TSH (time mark height) part.TSL partly grows 18 bits and with 225000 circulations of mould value, is used for the equipment of head drum by the 1800rpm rotation, or with 225225 circulations of mould value, is used for the equipment of head drum by the 1800/1.001rpm rotation.TSH partly grows 4 bits and circulates with mould value 12.For TSL, to return 0 o'clock at every turn, the TSH value just increases by 1.
In the recording equipment that the time mark counter can be used for will describing after a while, be used for producing the time mark of the MPEG bag of " normal play " information signal.The one-period of time mark counter equals head drum and rotated for 6 weeks.In this example, the time mark counter produces the time mark of 22 bits with the form of count word with the clock frequency of 27MHz.
Be stored in the special play-back synchronization blocks from the packets of information that comprises the I-frame of mpeg data stream and with these packets of information by retrieval well-known in the art, can from mpeg data stream, obtain the special play-back information of specific trick play speed.
The time mark generator unit can be used in the recording equipment, is used to produce the special play-back time mark of the MPEG bag of special play-back information signal.The form of special play-back time mark is shown among Fig. 7.The time mark of special play-back data is made up of TSL (time mark the is low) part of 18 bits and TSH ' (time mark height) part of 2 bits.The special play-back time mark of 20 bits is stored in the packet header 75 of two first special play-back synchronization blocks in the continuous special play-back synchronization blocks, wherein the MPEG bag corresponding to this time mark is stored in described two continuous special play-back synchronization blocks, sees Fig. 5.
In the time mark generator unit, number obtain the special play-back time stamp value of packets of information from the special play-back synchronization blocks of the first special play-back synchronization blocks of two special play-back synchronization blocks storing packets of information.Therefore will from special play-back synchronization blocks numbers 0,2,4 ..., 98 and 100 51 time marks that obtain being stored in 51 packets of information in 102 special play-back synchronization blocks.Further explain this derivation process with reference to figure 8.Fig. 8 shows (Z=) the 7 bit special play-back synchronization blocks TPSB# that produced by special play-back synchronization blocks generator, and illustrates and how to use the bit of this special play-back synchronization blocks number to obtain the special play-back time mark.N ' (=2) the highest individual significant bit is used as 2 bits of the TSH part of special play-back time mark in the special play-back synchronization blocks number.In addition, special play-back synchronization blocks number remaining A (=5) bit (minimum effective) is used to obtain the TSL part of special play-back time mark.More specifically, 12 minimum effective bits of the highest significant bit of TSL part and TSL part all value be " 0 ", and TSL remaining A (=5) bit value partly is an A minimum effective bit of special play-back synchronization blocks number.
TSL is used for the equipment of head drum by the 1800rpm rotation with 225000 circulations of mould value, or with 225225 circulations of mould value, is used for the equipment of head drum by the 1800/1.001rpm rotation.TSH ' is with 4 circulations of mould value.Got back to 0 o'clock at TSL, the value of TSH ' adds 1 at every turn, the result, and the one-period of TSL equals head drum 1/4th weeks of rotation, and special play-back time mark counter is an one-period with rotating a circle of head drum then.Common time mark counter and head switching impulsive synchronization in equipment.
Therefore the transport packet that is stored in two continuous special play-back synchronization blocks has time mark.Store in two continuous special play-back synchronization blocks of transport packet each and all have special play-back synchronization blocks number.As mentioned above, from those special play-back synchronization blocks number obtains described time mark.
Then, be described in the helical scan type equipment of recording of trick broadcast information on the record carrier radially.Figure 10 shows the recording equipment of the input terminal 111 that comprises receiving video signals and corresponding audio signal.Vision signal and corresponding audio signal may be encoded into the transport packet that is included in the MPEG serial data stream, and this is well-known in the art.Input terminal 111 is connected to the input 112 of " normal play " processing unit 114.In addition, " special play-back " processing unit 116 has the input 117 that is connected to input terminal 111 equally.The output 119 and 120 of " normal play " processing unit 114 and " special play-back " processing unit 116 is connected to the respective input of multiplexer 122." normal play " information and " special play-back " information will be recorded in the main region recording section 12 of magnetic track shown in Figure 2.
To further describing of " normal play " processing unit 114 and " special play-back " processing unit 116 with reference to U.S. Patent application US5579183.
Subcode and auxiliary signal generator 124 are provided, are used to provide the subcode signal that is stored in subcode signal recording section 4 information, and are used to provide the auxiliary signal that is stored in auxiliary signal recording section 8, see Fig. 2.The output of multiplexer 122 and generator 124 is connected to the input of error correcting encoder unit 126.Error correcting encoder unit 126 can be to " normal play " (video and audio frequency) information and special play-back information and executing error correction coding step, so that obtain being shown in the 12b part of main signal recording section 12 of Fig. 2 and the parity information in the 64b part of the synchronization blocks of Fig. 3.
Recording equipment also comprises and is used to synchronization blocks to increase synchronously and the generator 130 of id information, all as shown in Figure 3.In assembled unit 132, after the composite signal, the signal of combination is added to unit 134, this composite signal is carried out channel coding at this element.The channel coding of carrying out in coding unit 134 is well-known in the art.
The output of channel coding unit 134 is connected to the input of writing unit 136, utilization places at least two write heads 142 and 144 on the rotary head cylinder 146, and the traffic logging that in writing unit 136 coding unit 134 is obtained is on the inclined track of record carrier 140.Write head 142 and 144 has the head gap of mutual different orientations, and consequently (for example) magnetic head 142 is write and had among Fig. 1 from the lower-left to upper right azimuthal magnetic track, and magnetic head 144 is write and had among Fig. 1 from azimuthal magnetic track left to bottom right.In addition, time mark generator 147 can be used for being normal play processing unit 114 and special play-back processing unit 116 generation time marks.
-by control connection 150 control normal play signal processing units 114;
-by control connection 152 control trick play signal processing units 116;
-by control connection 154 control subcode signal and auxiliary signal generator unit 124;
-by control connection 156 control error correction coding blocks 126;
-by control connection 158 control synchronizing signal and ID signal generator unit 130;
-by control connection 160 control channel coding units 134;
-by the transmission speed of control connection 162 controlling recording carriers 140 and the rotation of head drum 146; And
-by 164 control time of control connection marker generator 147.
Special play-back is handled 116 and is suitable for retrieving the I frame information in mode well-known in the art from first information signal.In order to produce 10 special play-back synchronization blocks that comprise parity information, in processing unit 116, the special play-back information and executing is added the error correction coding step.
In addition, each special play-back information signal is produced the special play-back synchronization blocks, be stored in the special play-back synchronization blocks to each special play-back synchronization blocks generation special play-back synchronization blocks TPSB# and with it, and be each packets of information generation time mark in the above described manner.
Then, the normal play synchronization blocks that in multiplexer unit 122, makes up the special play-back synchronization blocks and produce by normal play signal processing unit 114, be used at a complete magnetic track by a head records information, the order of the synchronization blocks of normal play information and special play-back information is such, so that can form one main data area 12 in 48 magnetic tracks shown in Figure 1.
Increase sub-code data and auxiliary data and the normal play data and the special play-back data of combination are carried out error correction coding, so that obtain the parity information of track portion 12b.In addition, increase synchronization character and identification information.Then, before recorded information on the magnetic track, information is carried out the channel coding step.
To describe two kinds of diverse ways with reference to Figure 11 and Figure 12 then, and be used for number obtaining time mark from the special play-back synchronization blocks, these methods cause same time mark order.
In two kinds of methods, the time mark generator device is fit to the special play-back synchronization blocks number is carried out following step so that obtain described (n '+k ') bit count value:
Special play-back synchronization blocks number execution first is operated so that obtain first operating result (200,200 '),
Obtain the described n ' bit of described (n '+k ') bit count value from the first of described first operating result,
The second portion of described first operating result is carried out second operation so that obtain second operating result (202,202 '),
Obtain the described k ' bit of described (n '+k ') bit count value from described second operating result.
More particularly, in Figure 11, at described step (a), A (=6) the highest individual significant bit of special play-back synchronization blocks TPSB# multiply by first predetermined number, and this first predetermined number is 5 in this example.Then, the individual bit of n ' of bit count value that at described step (b), that the n ' of described first operating result 200 (=2) the highest individual significant bit is assigned to is described (n '+k '), i.e. the TSH part of count value.Second operation of the step of Figure 11 (c) is the multiplication of the remainder of described first operating result 200, and promptly result 200 6 minimum effective bits multiply by second predetermined number, and described in this example second predetermined number is 7.Then at described step (d), B significant bit the highest of the individual bit of k ' of bit count value that the individual bit of the B of second operating result 202 (=9) is assigned to is described (n '+k ').In addition, remaining (9) bit of the individual bit of described k ' is made as " 0 ", has produced the TSL part of count value.
More particularly, in Figure 12, at described step (a), special play-back synchronization blocks TPSB# multiply by first predetermined number, and described in this example first predetermined number is 5/4.In the example of Figure 12, this is to be finished by label 204 and 206 (divided by 4) represented step and additional step.Then, the individual bit of n ' of bit count value that at described step (b), that the n ' of described first operating result 200 ' (=2) the highest individual significant bit is assigned to is described (n '+k '), i.e. the TSH part of count value.Second operation of step among Figure 12 (c) is the multiplication of the remainder of described first operating result 200, and 6 minimum effective bits of promptly described result 200 multiply by second predetermined number, and described in this example second predetermined number is 7/8.In the example of Figure 12, this is to be that the step and the subtraction process of 208 and 210 (divided by 8) expressions finished by label.B significant bit the highest of the individual bit of k ' of bit count value that then, at described step (d), that the individual bit of the B of second operating result 202 ' (=9) is assigned to is described (n '+k ').In addition, remaining (9) bit of the individual bit of described k ' is made as " 0 ", produces the TSL part of count value.
Two kinds of methods all produce the aligned identical of count value, are better than the arrangement of the count value shown in Fig. 9, and there is approximately identical length in gap 1 and 2, and this length is about the distance between the continuous counter value.
Though described the present invention, be noted that these are not limitative examples with reference to most preferred embodiment of the present invention.Therefore, under the situation of the scope of the invention that does not break away from claims definition, those skilled in the art obviously can make various modifications.Therefore first information signal can be the signal of another kind of type, and it is different from digital video signal and/or digital audio and video signals, such as data-signal.In addition, be recorded in the information signal that trick play signal can be and first digital information signal has nothing to do of special play-back part.In such embodiments, record carrier is a recording medium, and a plurality of transmission passages on this media can be used for transmitting the independent information signal.In addition, any reference marker does not limit the scope of claim.With regard to regard to error correction coding equipment, can utilize the mode of software and hardware to realize the present invention, and can represent several " devices " with the same part of hardware.Word " comprises " not getting rid of and is different from other element listed in the claim and the appearance of step.And (a an) does not get rid of a plurality of such elements and occurs the indefinite article before element.
In addition, the invention reside in the combination of each novel feature or feature.
Claims (21)
1. be used for the equipment of record first and second digital information signals on the magnetic track of record carrier, described first and second digital information signals are the information signals that comprise the continuous information bag, and described equipment comprises:
-input unit is used to receive described first and second digital information signals;
-signal processing apparatus, be used for respectively described first and second digital information signals being processed into first tracer signal and first trick play signal that writes down on the described magnetic track that is adapted at described record carrier, described signal processing apparatus is suitable for producing synchronous information block, comprises the synchronization blocks of described first tracer signal of synchronization character, the information byte of synchronization blocks number and many described first digital information signals, so that be included in information stores in x the transport packet of described first information signal in individual first synchronization blocks of y at every turn;
The synchronization blocks of described first trick play signal comprises the information byte of synchronization character, special play-back synchronization blocks number and a plurality of described second information signals, to such an extent as to be included in information stores in x the transport packet of described second information signal in y second synchronization blocks at every turn;
-synchronization blocks generating apparatus is used for producing the described synchronization blocks number that is combined in described first synchronization blocks and is used for producing the described special play-back synchronization blocks number that is combined in described second synchronization blocks;
-time mark generator device, be used to produce the time mark of the described transport packet of described first and second digital information signals, described signal processing apparatus also is suitable for the described time mark in conjunction with the described transport packet in the synchronization blocks of described first tracer signal and described first trick play signal;
-signal combination device is used for described first and second synchronization blocks are combined into composite signal;
-writing station, be used on described magnetic track, writing composite signal with the booking situation speed of described record carrier, the said write device comprises first and second write heads that place on the rotatable head drum, described first magnetic head has the first party parallactic angle and described second magnetic head has the second party parallactic angle that is different from described first party parallactic angle, described first digital information signal is illustrated in the replay device playback with the playback speed that equals described writing speed, and described second digital information signal is represented to equal described writing speed n
1The playback of trick play speed doubly, wherein n
1Be to be not equal to 1 integer, x and y are the integers that satisfies x 〉=1 and y＞x, and the maximum common denominator of x and y is 1, it is characterized in that:
Described time mark generator device is suitable for number obtaining from the special play-back synchronization blocks of described second synchronization blocks described time mark of described second information signal.
2. the equipment that requires of claim 1 is characterized in that described time mark generator is suitable for number obtaining from the special play-back synchronization blocks of the one the second synchronization blocks that store described packets of information the time mark of the packets of information of described second information signal.
3. the equipment that require of claim 1 or 2 is characterized in that: described time mark generator device is suitable for producing the time mark of the packets of information of described second information signal so that continuous time mark value come down to equidistant.
4. the equipment that require of claim 1 or 2 is characterized in that: the said write device be suitable for p continuously the grouping of magnetic track write second synchronization blocks of described first trick play signal so that using n
1During described second synchronization blocks of doubly in the device of described second information signal of described record carrier speed playback of described writing speed, resetting, during rotating a circle, reads by described head drum m second synchronization blocks of described first trick play signal, described replay device comprises the rotary head cylinder with at least two magnetic heads, one of them magnetic head has described first party parallactic angle, and another magnetic head has described second party parallactic angle;
Described synchronization blocks generating apparatus is suitable for producing the continuous circulation of m the special play-back synchronization blocks number that is used for being attached to described m second synchronization blocks, and described m special play-back synchronization blocks number shows that with Z digital bit numerical table Z is the integer greater than 1;
Described time mark generator device is suitable for from the circulation of the described circulation generation time value of statistical indicant of m special play-back synchronization blocks number, the time tag value of (n '+k ') bit count value form so that obtain, wherein n ' and k ' are the integers greater than 1, n ' the bit of described (n '+k ') bit count value is to obtain from the first corresponding to the described Z bit number number of words of special play-back synchronization blocks number, obtains and the k ' bit of described (n '+k ') bit count value is a second portion from described Z bit number number of words.
5. the individual bit value of n ' of bit count value that the equipment that requires of claim 4 is characterized in that: Z is less than n '+k ' but greater than n ', described (n '+k ') is the individual bit of n ' that equals the first of described Z bit digital values.
6. the equipment that requires of claim 5, it is characterized in that: the first of described Z bit number number of words comprises the individual bit of n '.
7. the equipment that requires of claim 5 is characterized in that: the individual bit of n ' of described (n '+k ') bit count value is described (n '+k ') bit count value n ' the highest individual significant bit.
8. the equipment that requires of claim 4, it is characterized in that: the second portion of described Z bit number number of words has a plurality of bit A, A bit value in the individual bit of k ' of bit count value that it is less than k ', described (n '+k ') is to equal the remainder value of described k ' bit of described A bit of described second portion and described (n '+k ') bit count value for equaling " 0 ".
9. the equipment that requires of claim 8, back to back A significant bit value the highest of the individual bit of k ' of bit count value that it is characterized in that: the highest significant bit value of the individual bit of k ' of described (n '+k ') bit count value is for equaling " 0 ", described (n '+k ') is to equal the remainder value of the individual bit of described k ' of described A bit of described second portion and described (n '+k ') bit count value for equaling " 0 ".
10. the equipment that require of claim 1 or 2 is characterized in that: the said write device be suitable for p continuously the grouping of magnetic track write second synchronization blocks of described first trick play signal so that using n
1During described second synchronization blocks of doubly in the device of described second information signal of described record carrier speed playback of described writing speed, resetting, during rotating a circle, reads by described head drum m second synchronization blocks of described first trick play signal, described replay device comprises the rotary head cylinder with at least two magnetic heads, one of them magnetic head has described first party parallactic angle, and another magnetic head has described second party parallactic angle;
Described synchronization blocks generating apparatus is suitable for producing the continuous circulation of m the special play-back synchronization blocks number that is used for being attached to described m second synchronization blocks, and described m special play-back synchronization blocks number shows that with Z digital bit numerical table Z is the integer greater than 1;
Described time mark generator device is suitable for from the circulation of the described circulation generation time value of statistical indicant of m special play-back synchronization blocks number, the time tag value of (n '+k ') bit count value form so that obtain, wherein n ' and k ' are the integers greater than 1, and the step below described time mark generator device is suitable for special play-back synchronization blocks number carried out is so that obtain described (n '+k ') bit count value:
(a) to special play-back synchronization blocks number execution first operation, so that obtain first operating result;
(b) obtain the individual bit of described n ' of described (n '+k ') bit count value from the first of described first operating result;
(c) second portion of described first operating result is carried out second operation, so that obtain second operating result;
(d) obtain the individual bit of described k ' of described (n '+k ') bit count value from described second operating result.
11. the equipment that claim 10 requires is characterized in that: described first operation equals A significant bit the highest of special play-back synchronization blocks number be multiply by first predetermined number.
12. the equipment that claim 10 requires is characterized in that: the described step (b) that obtains comprises the individual bit of n ' of the n ' of described first operating result the highest individual significant bit being distributed to described (n '+k ') bit count value.
13. the equipment that claim 10 requires is characterized in that: described second operation equals the remainder of described first operating result be multiply by second predetermined number.
14. the equipment that claim 10 requires, it is characterized in that: the described step (d) that obtains comprises following substep: B Bit Allocation in Discrete that will described second operating result is to the B the highest individual significant bit of the individual bit of k ' of described (n '+k ') bit count value and make the remaining bits of the individual bit of described k ' equal " 0 ".
15. claim 4 or 10 equipment that require is characterized in that: n '=2 and k '=18.
16. claim 4 or 10 equipment that require is characterized in that: Z=7.
17. claim 8 or 11 equipment that require is characterized in that: A=5.
18. the equipment that claim 10 requires, it is characterized in that: described first predetermined number equals 5 or 5/4.
19. the equipment that claim 13 requires, it is characterized in that: described second predetermined number equals 7 or 7/8.
20. the equipment that claim 1 requires is characterized in that: described device also comprises and is used for retrieving described second digital information signal and being used for described second digital information signal is offered the indexing unit of described input unit from described first digital information signal.
21. the method for record first and second digital information signals on the magnetic track of record carrier, described first and second digital information signals are the information signals that comprise the continuous information bag, and described method comprises:
Described first and second digital information signals of-reception;
-respectively described first and second digital information signals are processed into first tracer signal and first trick play signal that writes down on the described magnetic track that is adapted at described record carrier, by producing the information byte of synchronous information block, the synchronization blocks that comprises described first tracer signal of synchronization character, synchronization blocks number and many described first digital information signals, so that be included in information stores in x the transport packet of described first information signal in individual first synchronization blocks of y at every turn;
The synchronization blocks of described first trick play signal comprises the information byte of synchronization character, special play-back synchronization blocks number and a plurality of described second information signals, to such an extent as to be included in information stores in x the transport packet of described second information signal in y second synchronization blocks at every turn;
-produce the described synchronization blocks be combined in described first synchronization blocks number and be used for producing the described special play-back synchronization blocks number that is combined in described second synchronization blocks;
-produce the time mark of the described transport packet of described first and second digital information signals, and in conjunction with the described time mark of the described transport packet in the synchronization blocks of described first tracer signal and described first trick play signal;
-described first and second synchronization blocks are combined into composite signal;
-on described magnetic track, write composite signal with the booking situation speed of described record carrier, described first digital information signal is illustrated in the replay device playback with the playback speed that equals described writing speed, and described second digital information signal is represented to equal described writing speed n
1The playback of trick play speed doubly, wherein n
1Be to be not equal to 1 integer, x and y are the integers that satisfies x 〉=1 and y 〉=x, and the maximum common denominator of x and y is 1, it is characterized in that:
Described time mark produces step and comprises following substep: the described time mark that number obtains described second information signal from the special play-back synchronization blocks of described second synchronization blocks.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99202722.7 | 1999-08-24 | ||
| EP99202722 | 1999-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1327681A true CN1327681A (en) | 2001-12-19 |
Family
ID=8240559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00802303A Pending CN1327681A (en) | 1999-08-24 | 2000-07-31 | Recording of a trick signal on a record carrier |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1121803A1 (en) |
| JP (1) | JP2003507973A (en) |
| KR (1) | KR20010087379A (en) |
| CN (1) | CN1327681A (en) |
| TW (1) | TW559805B (en) |
| WO (1) | WO2001015441A1 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000064857A (en) * | 1997-02-03 | 2000-11-06 | 엠. 제이. 엠. 반 캄 | Apparatus and method for recording a plurality of trick-play signals on a record carrier |
-
2000
- 2000-04-27 TW TW089108026A patent/TW559805B/en active
- 2000-07-31 JP JP2001519034A patent/JP2003507973A/en active Pending
- 2000-07-31 CN CN00802303A patent/CN1327681A/en active Pending
- 2000-07-31 KR KR1020017005126A patent/KR20010087379A/en not_active Application Discontinuation
- 2000-07-31 WO PCT/EP2000/007419 patent/WO2001015441A1/en not_active Application Discontinuation
- 2000-07-31 EP EP00956367A patent/EP1121803A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001015441A1 (en) | 2001-03-01 |
| JP2003507973A (en) | 2003-02-25 |
| EP1121803A1 (en) | 2001-08-08 |
| TW559805B (en) | 2003-11-01 |
| KR20010087379A (en) | 2001-09-15 |
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