JPH1028252A - Digital video recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly transmit time information related to the arrival time of a bit stream in which plural programs are broadcast-included in a reproduction signal to a decoder in a digital video recorder which extracts and records a desired program from the bit stream. SOLUTION: When a user selects a desired program, a packet discriminator 2 selects an MPEG-TS(moving picture expert group - transport stream) packet including the information of the selected program, and records the data of the selected packet in a magnetic tape. At the time of reproduction, a rate is converted into the same transmission rate as a frequency which is the integral multiple of 27Mbps being the clock frequency unit of a PCR(program clock reference) value by a rate converter 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to MPEG2 (Moving Pic).
2) The present invention relates to a digital video recorder that records a transport stream (hereinafter, referred to as “MPEG-TS”) signal on a recording medium such as a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, the technology of recording an MPEG-TS signal is as follows.
This is described in a patent application publication (JP-A-7-327199).

In the method described in this document, when recording all or a part of a broadcasted MPEG-TS signal on a VCR, a PMT (program map tabl) transmitted at the same time as the broadcast is transmitted.
e: Information that is multiplexed in the MPEG-TS signal that is transmitted by multiplexing multiple programs. There is one for each program, and data related to the corresponding program is transmitted in packets with any PID value. Information is transmitted. ) Or the corresponding PID (Packet ID:
It is characterized by rewriting the identification signal of each packet).

[0004] By doing so, digital broadcasting
When playing the program after recording it on a VCR (video cassette recorder), select a predetermined VCR-dedicated program number X during broadcasting without inputting the program number assigned by the broadcasting station. Thus, the decoder can automatically reproduce the reproduction data from the VCR.

[0005]

However, the above-mentioned literature does not mention the mismatch of the PCR (Program Clock Reference) value generated in the process of recording and reproducing the MPEG-TS signal.

[0006] The PCR value is a transport stream (TS) packet shown in FIG.
oad, which consists of 188 bytes) as shown in the adaptation_field of the TS packet header area.
Time management information written in the 42 bits of the PCR area.
Expressed in Hz clock units. The role of the PCR is to transmit the time information at the time of encoding to the decoder.The decoder adjusts the internal clock of the decoder itself based on this PCR value, and manages the time management information at the time of encoding and the time management at the time of decoding. Ensure consistency of information.

In broadcasting a PCR value, it is recommended to insert an MPEG-TS packet containing the PCR value approximately every 100 ms. The PMT number of the packet carrying the PCR value is indicated in the PMT, for example, by PCR_PI
It is written as D = 10.

[0008] However, the time information of the PCR value corresponds to the bit stream at the time of broadcasting, and an arbitrary program is extracted from the recorded information such as a VCR or the like which has undergone rate conversion processing. Information is crumbled.

[0009] The reproduction signal of the digital video recorder in which the PCR values having inconsistency are recorded is directly converted to an MPE.
If the data is transferred to the G decoder, the decoder cannot operate properly.

Therefore, before transferring the reproduction signal of the digital video recorder to the decoder, it is necessary to re-synthesize it into a bit stream having time information that can be correctly interpreted by the decoder.

Accordingly, an object of the present invention is to solve such a problem.

[0012]

According to the first aspect of the present invention, there is provided means for simultaneously receiving a plurality of programs which are time-divisionally transmitted by bit stream data composed of a plurality of packets having a predetermined transmission rate; Selecting means for selecting and outputting data of a packet group relating to an arbitrary program from a plurality of programs, and recording for recording data of the packet group selected by the selecting means on a recording medium at a first transmission rate Means, reproduction means for reproducing data recorded on the recording medium at the first transmission rate, and transmission for converting data having the first transmission rate obtained by the reproduction means to a second transmission rate Rate conversion means, wherein a predetermined packet among the plurality of packets includes time management information expressed in a predetermined clock frequency unit, The transmission rate is a digital video recorder, characterized in that the same transmission rate as the frequency of an integral multiple of the clock frequency of the time management information.

According to a second aspect of the present invention, there is provided a digital video recorder for recording an MPEG-2 transport stream (hereinafter, referred to as "MPEG-TS") signal on a recording medium such as a magnetic tape. Means for simultaneously receiving a plurality of programs included in an MPEG-TS signal transmitted in a time-division manner as bit stream data composed of packets, and selecting data of a packet group relating to an arbitrary program from among the plurality of programs. Selecting means for outputting the data of the packet group selected by the selecting means on a recording medium at a first transmission rate; and storing the data recorded on the recording medium at the first transmission rate. Reproducing means for reproducing the data having the first transmission rate obtained by the reproducing means; And means, 27 Mbps in the predetermined packet in said plurality of packets
PCR (Program Clock Reference) as time management information expressed in clock frequency units (Mbps: megabits / second)
rence) value, and the second transmission rate is the same transmission rate as an integer multiple of 27 Mbps, which is the clock frequency of the time management information.

According to a third aspect of the present invention, in the second aspect, the first transmission rate which is a reproduction rate is 27M.
* (I-1) bits / sec, higher than 27M * If i bits / sec or less (i is a natural number), the reproduction rate is 27M
* It is characterized in that it is converted to i bits / second and output.

According to a fourth aspect of the present invention, in the third aspect, an MPEG-TS packet having a PCR value (hereinafter referred to as a "PCR") in a series of MPEG-TS packets comprising an arbitrary reproduced program.
Field ") between the MPEG-TS packet containing two adjacent PCR fields,
X is a value obtained by converting the difference ΔPCR of the PCR value of the field into the number of cycles in the (27 * i) MHz clock period, and MPEG recorded between the MPEG-TS packets including the two adjacent PCR fields. When the total number of bits of the -TS signal is Y, (X-Y) pieces of (27 * i) MHz dummy data are inserted.

According to a fifth aspect of the present invention, in the second aspect, the first transmission rate which is a reproduction rate is set to (27 * 2
^(j-1) ) characterized in that it is converted to a second transmission rate which is a transmission rate of bits / second and output, wherein j is the reproduction rate higher than 0 bits / second. , 27 Mbits / sec or less, j = 1, and when the reproduction rate is higher than 27 Mbits / sec, the reproduction rate is higher than 27 M * 2 ^(j−2) bits / sec.
Take an integer value of 2 or more that satisfies the condition of 2 ^{(j -1)} bits / second or less.

According to a sixth aspect of the present invention, in the fifth aspect, an MPEG-TS packet having a PCR value (hereinafter referred to as a "PCR") in a series of MPEG-TS packets comprising an arbitrary reproduced program.
Field ") between the MPEG-TS packet containing two adjacent PCR fields,
The difference ΔPCR between the PCR values in the field is (27 * 2 ^(j-1) ) MHz.
Assuming that a value obtained by converting the number of cycles in the clock period is Z, and the total number of bits of the MPEG-TS signal recorded between the MPEG-TS packets including the two adjacent PCR fields is Y, ZY) (27 * 2 ^{(j -1)} ) MHz dummy data are inserted.

According to a seventh aspect of the present invention, in the digital video recorder of the fourth and sixth aspects, the dummy data is MPEG
-The data is characterized in that it is data in which 0x47 which is the Syncbyte pattern of the TS packet does not occur. According to an eighth aspect of the present invention, in the digital video recorder of the seventh aspect, the dummy data comprises bits in which "0" and "1" are alternately repeated.

As described above, since the PCR value is expressed in units of a 27 MHz clock, ΔPCR takes a value that is an integral multiple of the 27 MHz clock cycle, and thus the output transmission rate is 27 MHz.
(XY) or (ZY) derived by using the means for solving the above problem between the MPEG-TS packets including two adjacent PCR fields by performing rate conversion to a value that is an integral multiple of z. By inserting) pieces of dummy data, consistency between the two adjacent PCR values can be obtained. The dummy data is MPEG-
Since the data does not include the Syncbyte pattern 0x47 of the TS packet, no malfunction occurs on the decoder side.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing a conventional digital broadcast receiving system. A broadcast signal radiated from a broadcast / communication satellite is caught by an antenna 51, demodulated by a demodulator 52, and then FEC ( FORWARD ERROR CORRECTIO
N) The error correction processing is performed by the circuit 53, and the 188-byte MPEG
-Returned to TS signal. Reference numeral 57 denotes a PLL circuit for generating a clock.

This MPEG-TS signal is supplied to a demultiplexer (D
eMUX) A tuning operation is performed in which only information relating to the program selected by the remote controller or the like is extracted in the 54 section,
The signal extracted by this channel selection operation is decoded into a video signal and an audio signal by the MPEG video decoder 55 and the MPEG audio decoder 56, respectively, and output.
The dashed line portion except for the antenna 51 is a portion called a set-top box. And, the VCR 58 of the present invention
Records part or all of the MPEG-TS signal after the FEC circuit 53.

Although the bit rate of the MPEG-TS signal varies depending on the broadcasting system, in this embodiment, it is 30 Mbps (bps:
Bits / sec).

Also, a VCR that satisfies a format for recording a DVB (European Digital Broadcasting) signal is used as the VCR for recording an MPEG-TS signal.

As shown in FIG. 3, the SD format (Sp
ecifications of Consumer-Use Digital VCRs PART2)
The method of recording the MPEG-TS signal in the video area of
The video area consists of one physical track pattern with a period of 4 tracks (F0, F1, F0, F2), a normal playback data area (NP area), a special playback data area (TPL area, TPH area), It consists of three ECC areas.

In the NP area, an MPEG-TS packet relating to a program to be recorded is formed into blocks (sync blocks) in a predetermined format described later and recorded. At this time MPEG-T
The contents of the S packet are recorded without change.

The TPL and TPH areas are recording areas for special reproduction data such as fast-forward and rewind. The TPL area is for recording low-speed reproduction data, and the TPH area is for recording high-speed reproduction data. The MPEG-TS signal for trick play is a signal composed of only an I-picture, which is an intra-coded picture, and is created from an input MPEG-TS signal in a VCR. The ECC3 area is an error correction code newly added for an MPEG-TS signal separately from the Reed-Solomon inner code and outer code defined in the SD format. Special play data area, ECC3
The area has no essential meaning in the description of the present embodiment, and will be described only above.

Next, the sync block configuration of the digital VCR in this embodiment will be described with reference to FIG.

The structure of one sync block in the SD format includes a 2-byte Sync signal, a 3-byte ID area, a 77-byte data area, and an 8-byte ECC area. 5
Using the data area of one sync block, 188
It is assumed that two packets of MPEG-TS signal of bytes are recorded.

Next, the processing of the MPEG-TS packet will be described with reference to FIG.

The input bit stream (FIG. 5A)
Three types of programs (programs) at a transmission rate of 30 Mbps (Pro
gA, Prog.B, Prog.C) are multiplexed.

Here, when only Prog.A is recorded, packets relating to Prog.B and Prog.C are discarded from this input bit stream. In the selected MPEG-TS packet, as shown in Fig. 4, two MPEG-TS packets are rearranged into five sync blocks, the various headers described above are added, and the rate conversion is performed so that the recording rate of the video area becomes 25 Mbps. Is
Recorded on VCR.

On the other hand, at the time of reproduction, the output signal from the VCR has a recording / reproduction rate of the VCR recording signal of 25 M as shown in FIG.
The output MPEG-B of FIG. 5C in which the rate is converted to 27 Mbps by either A or B in the following method and dummy data is inserted between the MPEG-TS packets including adjacent PCRs. Outputs TS signal. (Method A) The playback rate of a series of MPEG-TS signals composed of any recorded program is 27M * (i-1).
Bit / sec and less than 27M * i bit / sec
(i is a natural number), the reproduction rate is converted to 27M * i bits / sec and output.

At this time, a PCR value included in a series of MPEG-TS packets composed of an arbitrary program reproduced is detected, and an MPEG-T having a PCR (Program Clock Reference) value is detected.
An S-packet and an MPEG-TS packet having the same PCR value existing after the MPEG-TS packet, that is, an MPEG-TS packet including two adjacent PCR fields, the PCR of the two adjacent PCR fields Value difference ΔPCR (2
7 * i) A value X obtained by converting the number of cycles in the MHz clock period and an MPEG including the two adjacent PCR fields
-Insert (X-Y) dummy data having a period of (27 * i) MHz derived from the total number of bits Y of the MPEG-TS signal recorded between TS packets. Specifically, they are classified as shown in Table 1 below.

[0035]

[Table 1]

(Method B) The reproduction rate of a series of MPEG-TS signals comprising an arbitrary program recorded
* 2 ^(j-1) ) Converted to bits / second and output.

Here, j indicates that the reproduction rate is 0 bits /
When it is higher than second and 27 Mbit / sec or less, j = 1. When the reproduction rate is a value higher than 27 Mbit / sec, the reproduction rate is higher than 27 M * 2 ^(j-2) bits / sec and satisfies the condition of 27 M * 2 ^(j-1) bits / sec or less. Takes an integer value of 2 or more. Specifically, the values are as shown in Table 2 below.

[0038]

[Table 2]

The PCR field is a 42-bit area in the optional fields of the transport stream shown in FIG.
As shown in FIG. 6, a PCR_base area of 33 bits and a 9-bit PCR
It consists of a PCR_extention area. The data in the PCR_base area increases by 90 KHz, and the data in the PCR_extension area increases by 1 in 27 MHz units. PCR_ex is PCR_ex
27MHz unit in the tention area (27MHz clock)
Then, the PCR_extention area becomes 0 and the PCR_base area increases by 1 at the same time as the PCR_extention area becomes 0.

FIG. 7 is a diagram showing the concept of this count-up operation. The PCR_extention area starts with “000000000” and counts up with a 27 MHz clock, in other words, one every 1 / (27E6) seconds. It is counted up, and after 1 / (27E6), it becomes “0000000001” and the next 1
After / (27E6), it is counted up to “0000000010” and counted up to 299 (“100101011”), and after 1 / (27E6), it becomes “000000”.
000 "and the count value of the PCR_base area increases by 1 to" 00000000000000000000000000000000 ".
1 ".

Thus, in the reproduced MPEG-TS signal after the rate conversion to 27 Mbps, the number of data X to be present between the MPEG-TS packets including the i-th PCR value and the (i + 1) -th PCR value is:

[0042]

(Equation 1)

Is obtained by Note that “*” is a multiplication symbol, and 27E6 in FIG. 7 is “27 times 10-6”.
To the power. Next, a block configuration of a VCR that specifically realizes the method of the above embodiment will be described with reference to FIG. In this circuit block diagram, i =
It is assumed that j = 1.

When the program number to be recorded is input to the PSI processing unit 1 by a remote controller or the like, first, the PAT (PAT is PID = 0x000) included in the input MPEG-TS signal (30 Mbps)
It is determined by the standard to be 0. ) Is referenced,
The PID value (for example, 5) of the MPEG-TS packet carrying the PMT of the program to be recorded is obtained.

Further, with reference to the PMT, the PID value of each elementary stream (for example, video 1 = 1
0, video 2 = 11, audio 1 = 20, audio 2 = 21).

A PID value including a PCR value for the program is also described in the PMT (for example, if PCR_PID = 10, in this case, how many of the MPEG-TS packets carrying the elementary stream of video 1 Once per PCR
There is a packet that contains the value. ), This packet
This is a packet that must be recorded in the VCR.

That is, by referring to the PAT and PMT in the PSI processing unit 1, the PID number of the packet necessary to record a desired program can be found.

The packet discriminator 2 discriminates only packets having the PID value determined by the PSI processing unit 1 from the input MPEG-TS signal (in the above example, PID = 10, 0, 20,
5) Other packets are discarded.

The signal from the packet discriminator 2 is temporarily stored in the rate converter 3 composed of a buffer memory,
The data is read out at the timing required by the R signal formatter circuit 4 (a transmission rate of 25 Mbps) and input to the VCR signal formatter circuit 4.

In the VCR signal formatter circuit 4, as shown in FIG. 4, various headers are added to the recorded MPEG-TS signal and divided into five sync block units, and then the SD format such as error correction code addition and modulation processing is added. Is performed, and the magnetic tape 6 is passed through the recording head 5.
Will be recorded.

At the time of reproduction, the signal on the magnetic tape 6 is read out by the reproduction head 7, the waveform is equalized by the equalizer 8, and then input to the VCR signal deformatter circuit 9. The VCR signal deformatter circuit 9 performs the same processing as the SD format such as demodulation and error correction processing.
Once in the rate converter 11 composed of a buffer memory,
Can be stored.

On the other hand, the reproduced MPEG-TS signal from the VCR signal deformatter circuit 9 is input to the packet identification unit 12,
From the PMT information of the reproduced MPEG-TS signal, the value of the PCR_PID (5 in the example) of the recorded program is detected by the same method as the processing in the PSI processing unit 1 described above. In the PCR value detector 10,
MPE having a PCR_PID value identified by the packet identification unit 12
The PCR value is extracted from the G-TS packet, and the number of data X (bits) when the data is filled at a transmission rate of 27 Mbps between the MPEG-TS packets including two adjacent PCR values by the above-described calculation method. Ask for. The data number X is then output to the subtractor 15.

The packet discriminating unit 12 simultaneously counts the number y of packets recorded between the MPEG-TS packets including the two adjacent PCR values.
The total number of recording bits Y = y * 188 * 8 existing between the MPEG-TS packets including the PCR value is calculated and output to the subtracter 15.

The detection of the number of packets y is performed by first detecting a series of reproduced MPEG-T signals output from the VCR signal deformatter circuit 9.
When the PID of the S packet matches the PCR_PID value, the counter is set to 1, and the PID of the next MPEG-TS packet is set to PCR_PID.
It is determined whether or not the value matches the PID value. If the value does not match, the counter value is incremented by one, the count-up is continued until the value matches, and the value is set to 1 again when the value matches. This can be realized by taking in the counter value immediately before setting.

In the example of FIG. 5, y = 4, that is, Y = 6016 is detected.

The subtractor 15 calculates the number of dummy data (XY) bits to be inserted between the MPEG-TS packets including the two adjacent PCR values from X and Y detected by the above method, and generates a timing signal. The data is input to the unit 16.

The reproduced MPEG-TS signal once stored in the rate converter 11 is transmitted at a transmission rate of 27 Mbps according to the timing signal from the timing signal generator 16 to the adjacent MPEG-2 TS signal.
All data existing between the MPEG-TS packets including one PCR value is output through the switch SW14. Then, according to the timing signal from the timing signal generator 16,
The switching SW 14 is switched to the dummy data generating unit 13 side, and the dummy data for the number of bits calculated by the subtracter 15 is output through the switching SW 14. In other words, play
A signal in which dummy data is inserted into the MPEG-TS signal is output.

The dummy data generator can be constituted by a simple clock frequency dividing circuit shown in FIG. That is, "1" and "0"
Are data generators that occur alternately. This dummy data is different from the Syncbyte pattern 0x47 (Hex 47) of the MPEG-TS signal, and of course, the data transition frequently occurs, so the PLL (Ph
ase Lock Loop) can be applied stably.

In the set-top box, the MPEG-TS signal having the transmission rate of 27 MHz into which the dummy data is inserted is received by the DeMUX unit 54 of FIG.
5. The video signal and the audio signal are decoded by the MPEG audio decoder 56 and output to the monitor and the speaker.

At this time, the set top box receives
Since there is no contradiction in the PCR values of the MPEG-TS signal, no error is caused on the decoder side. The present invention can be realized by the embodiments described above.

Although a magnetic tape was used as a recording medium, a tape-shaped medium having magnetic and non-magnetic recording means was used.
It is clear that the same effect can be realized by a disk-shaped recording medium. Further, it is apparent that the present invention can be applied to a similar broadcasting system including a packetized signal similar to the MPEG-TS signal and time information regarding the arrival time of the packetized signal, such as PCR, even if the signal is not an MPEG-TS signal. is there.

As described above, an arbitrary program is extracted from the multiplexed MPEG-TS signal, and the recording rate is set to VCR.
For example, the recording signal that has been rate-converted to a rate specific to the recording signal itself and the time relationship between the recording signal itself and the PCR included in the recording signal have been broken, but according to the present invention, the adjacent PCR Is inserted between the MPEG-TS packets including the dummy data so that the time relationship is correct.
Since the PCR value is displayed in units of 27 MHz, by setting the output rate after conversion to an integral multiple of 27 MHz, it is possible to match the PCR value by inserting an integer number of dummy data. When a relationship is replayed, it can be rebuilt into the correct relationship.

[0063]

According to the present invention, in a digital VCR for extracting and recording a desired program from a bit stream on which a plurality of programs are broadcast, time information on the arrival time of the bit stream included in the reproduced signal is correctly transmitted to a decoder. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram of a digital VCR according to an embodiment of the present invention.

FIG. 2 Digital broadcast receiving system and digital VCR
It is a block diagram of.

FIG. 3 is a track pattern diagram of a DVB signal recording format.

FIG. 4 is a diagram showing five sync block units of the DVB signal recording format.

FIG. 5 is a diagram showing a flow of an MPEG-TS signal according to an embodiment of the present invention.

FIG. 6 is a diagram showing a data configuration of a PCR.

FIG. 7 is a diagram illustrating a count-up operation of PCR data.

FIG. 8 is a diagram illustrating an example of a dummy data generation circuit.

FIG. 9 is a diagram showing the contents of a transport stream packet.

[Explanation of symbols]

 Reference Signs List 1 PSI processing unit 2 Packet discriminator 3 Rate converter 4 VCR signal formatter circuit 5 Recording head 6 Magnetic tape 7 Reproducing head 8 Equalizer 9 VCR signal deformatting 10 PCR value detection unit 11 Rate converter 12 Packet discrimination unit 13 Dummy data generation Unit 14 Changeover switch 15 Subtractor 16 Timing signal generator

Claims (8)

[Claims] 1. A means for simultaneously receiving a plurality of programs time-divisionally transmitted by bit stream data consisting of a plurality of packets having a predetermined transmission rate, and a packet associated with an arbitrary program among the plurality of programs. Selecting means for selecting and outputting data of a group; recording means for recording data of a packet group selected by the selecting means on a recording medium at a first transmission rate; A reproducing unit for reproducing at a first transmission rate; and a rate converting unit for converting data having the first transmission rate obtained by the reproducing unit to a second transmission rate. Packet contains time management information expressed in a predetermined clock frequency unit, and the second transmission rate is based on the clock of the time management information. Digital video recorders, characterized in that the same transmission rate and an integer multiple of the frequency of the frequency. 2. A digital video recorder for recording an MPEG2 transport stream (hereinafter, referred to as "MPEG-TS") signal on a recording medium such as a magnetic tape, as bit stream data composed of a plurality of packets having a predetermined transmission rate. MPEG-T transmitted by time division
Means for simultaneously receiving a plurality of programs included in the S signal; selecting means for selecting and outputting data of a packet group relating to an arbitrary program among the plurality of programs; and a packet selected by the selecting means Recording means for recording the data of the group on a recording medium at a first transmission rate; reproducing means for reproducing the data recorded on the recording medium at the first transmission rate; and the first means obtained by the reproducing means Transmission rate conversion means for converting data having a transmission rate of 2 Mb to a second transmission rate, wherein 27 Mbp is assigned to a predetermined packet in the plurality of packets.
PCR (ProgramClock Ref) as time management information expressed in clock frequency units of s (Mbps: megabits / second)
erence) value, and the second transmission rate is the same transmission rate as an integer multiple of 27 Mbps, which is the clock frequency of the time management information. 3. The method according to claim 2, wherein the first transmission rate that is a reproduction rate is 27M * (i−1) bits /
A digital video recorder characterized by converting the reproduction rate to 27 M * i bits / sec and outputting the data when the reproduction rate is higher than 2 sec and less than 27 M * i bits / sec (i is a natural number). 4. The method according to claim 3, wherein a PCR value is included in a series of MPEG-TS packets composed of an arbitrary reproduced program.
Detects MPEG-TS packets (hereinafter "PCR fields")
A value obtained by converting the difference ΔPCR between the PCR values of the two adjacent PCR fields between the MPEG-TS packets including the two adjacent PCR fields into the number of cycles in the (27 * i) MHz clock period is represented by X , Including the two adjacent PCR fields
When the total number of bits of the MPEG-TS signal recorded between the MPEG-TS packets is Y, (X−Y) dummy data having a period of (27 * i) MHz is inserted. Digital video recorder. 5. The method according to claim 2, wherein the first transmission rate, which is a reproduction rate, is converted into a second transmission rate, which is a transmission rate of (27 * 2 ^{(j -1)} ) bits / second, and is output. A digital video recorder characterized by the following. Here, j is j when the reproduction rate is higher than 0 bits / sec and 27 Mbits / sec or less.
= 1, when the reproduction rate is a value higher than 27 Mbits / sec, the reproduction rate is higher than 27 M * 2 ^(j−2) bits / sec and not more than 27 M * 2 ^(j−1) bits / sec. Takes an integer value of 2 or more that satisfies the condition. 6. A sequence according to claim 5, wherein the sequence has a PCR value in a series of MPEG-TS packets comprising an arbitrary program reproduced.
Detects MPEG-TS packets (hereinafter "PCR fields")
The number of cycles in the (27 * 2 ^{(j -1)} ) MHz clock period, which is the difference ΔPCR between the PCR values of the two adjacent PCR fields, between the MPEG-TS packets including the two adjacent PCR fields. Assuming that the converted value is Z and the total number of bits of the MPEG-TS signal recorded between the MPEG-TS packets including the two adjacent PCR fields is Y, (Z−Y) (27 * 2)
^(j-1) ) A digital video recorder characterized by inserting dummy data with a period of MHz. 7. The digital video recorder according to claim 4, wherein said dummy data is a synchronizing signal of an MPEG-TS packet.
A digital video recorder characterized in that the cbyte pattern 0x47 is data that does not occur. 8. The digital video recorder according to claim 7, wherein said dummy data comprises bits in which "0" and "1" are alternately repeated.