JPH08307824A - Multi-channel recording and reproducing device - Google Patents

Abstract

PURPOSE: To rearrange special reproduction data in the unit of frames. CONSTITUTION: Special reproduction data from a special reproduction exclusive data generating circuit 4 are stored respectively in frame memories M1 to Mn for each channel. A read circuit 4 reads frame data of a frame corresponding to each channel out of the frame memories M1 to Mn so as to be consecutive. The frame data from the frame memories M1 to Mn are outputted via a switch 5. Thus, even when data of plural channels are multiplexed, rearrangement in the unit of frames using a frame flag is attached in case of reproduction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel recording / reproducing apparatus suitable for recording and reproducing an MPEG standard data stream.

[0002]

2. Description of the Related Art In recent years, MPEG (Moving Picture Exper)
With the establishment of image compression techniques such as ts Group) 2, digitization of images is progressing. Also in television broadcasting, digital broadcasting adopting the MPEG2 system has begun to be studied. In addition, multimedia services that handle audio and video in an integrated manner and are able to provide various information services by images in response to user requests are also being developed. In the MPEG2 standard, DCT (Di
screte Cosine Transform), a video signal is coded using a combination of inter-frame predictive coding, run-length coding and entropy coding. That is, in the MPEG system, not only compression by DCT (intra-frame compression) is performed within one frame, but also inter-frame compression for reducing redundancy in the time axis direction by utilizing correlation between frames is adopted.

MPEG2 has a system corresponding to multi-channel broadcasting and multi-media conversion in communication or storage media. That is, MPEG2 is designed to transmit transmission data in units of packets in order to facilitate time division multiplexing of a plurality of images, voices and data. One packet is composed of the same type of data, and an identification signal (PI
D) is added. As a result, not only image and audio data, but also predetermined private data and the like can be transmitted at the same time, and can be used in broadcasting, communication, or storage fields.

By the way, it is conceivable to record such a transport stream by a VCR (video tape recorder). A helical scan type VCR reads information recorded on a magnetic tape by tracing a recording track formed on the magnetic tape with a rotating drum head. Normal reproduction is performed by matching the rotational speed of the rotary drum head and the tape running speed of the magnetic tape during recording and reproduction, and by matching the recording track pattern with the head trace pattern during reproduction.

On the other hand, at the time of special reproduction, the tape running speed is changed according to the double speed number. In this case, the head traces while crossing the recording track. Then, of the traced portion, only the data of the portion where the azimuths of the heads and the recording track match is reproduced. Even in this case, one screen can be reproduced in analog recording in which the position on the screen corresponds to the recording position on the recording medium.

However, when the image data compressed by the MPEG system is recorded on the recording medium, the code amount is different between the intra-frame compression frame and the inter-frame compression frame, so that the vertical position of the image data on the screen is changed. Does not correspond to the vertical recording position on the recording medium, and one frame cannot always be reproduced by the reproduction data at the time of high speed reproduction. Furthermore, since the inter-frame compressed frame cannot be decoded by a single frame, it cannot be reproduced when a frame that is not decoded occurs, such as during high-speed reproduction.

Therefore, in the specification of Japanese Patent Application No. 6-065298 (hereinafter referred to as Document 1) filed by the applicant of the present application, intermittently at the position of each track through which the head passes during high speed reproduction. A method of recording data for high speed reproduction has been proposed. At the time of reproduction, a high-speed reproduction image is obtained by accurately tracing the area in which the data for high-speed reproduction is recorded.

That is, when the tracking phase is controlled in the magnetic recording / reproducing apparatus, there is an area on the magnetic tape (hereinafter referred to as special reproduction data recording area) which is always traced during high speed reproduction. By the head trace at the time of high speed reproduction, the special reproduction data recording area can be traced and the special reproduction data recorded in this area can be reproduced. That is, in this proposal, at the time of recording, the input coded data is recorded as data for normal reproduction in an area other than the special reproduction data recording area. On the other hand, of the encoded data, for example, the special reproduction data is created by using the intra-frame compressed data of the video data, packetized, and the special reproduction packet is recorded in the special reproduction data recording area.

[0009] Furthermore, Japanese Patent Application No.
No. 14205 (hereinafter referred to as Document 2) discloses a method for backward reproduction in the device of Document 1 described above. For example, during reproduction in the forward direction, the head sequentially performs reproduction from the special reproduction data recording area on the tape head side to the special reproduction data recording area on the tape rear end side. On the other hand, since the tape running direction is reversed between the forward playback and the backward playback, during backward playback, from the special playback data recording area on the tape rear end side to the special playback data recording area on the tape front side. Playback is performed sequentially.

Therefore, when the special reproduction data recording area is reproduced by the reverse reproduction, the special reproduction packets in the special reproduction data recording area are reproduced in the normal order, but the special reproduction data recording areas are reproduced in the reverse order. Also, in each trick play data recording area, packet data of a plurality of packets is recorded in packet units, and the number of packets in one frame differs for each frame. That is, a frame boundary may exist in the trick play data recording area.

Therefore, when the special reproduction data recording area is reproduced in the reverse direction, the data of the same frame in the special reproduction packet data may be arranged discontinuously. In order to restore each trick play frame, it is necessary to arrange the packet data in frame order in the original recording order. That is, for reverse reproduction, the time sequence of a series of screens is reversed and the packet data of each screen is arranged in the encoding order corresponding to the position of the screen. That is, in order to reproduce the special reproduction data recording area in the reverse direction, information for identifying the packet as a boundary between the special reproduction frames is necessary. In Reference 2, the reproduced packet data at the time of backward reproduction is rearranged based on the information indicating the boundary between the frames.

Incidentally, in the MPEG2 standard, a transport packet is set as a transmission unit. The transport packet corresponds to a multi-program (channel), and a packet of a desired program can be selected from a plurality of programs transmitted in time division at the time of decoding. Because of this choice, the transport packet is a payload that carries information.
Is transmitted before the link level header (Link Level Header). The transport packet is composed of 188 bytes, and 4 bytes of this are a link level header. A PID (Packet identification) which is identification information of the packet is inserted in the link level header.

The MPEG2 decoder has a function of detecting PIDs from sequentially input packets and extracting packets of the same channel, whereby only a desired program can be decoded from transmission data.
For example, news and sports programs can be mixed and transmitted in a single data string. In this case, the data of each channel are transmitted independently of each other.

FIG. 6 is an explanatory diagram for explaining reverse reproduction when such multi-channel transmission data is recorded in the special reproduction data recording area in the apparatus of Document 2.

As shown in FIGS. 6 (a) and 6 (b), the data of the channel (ch) 1 is divided into four in the vertical direction of the screen to obtain data a, b, c and d, respectively. Similarly,
The data of channel (ch) 2 is also divided into four in the vertical direction of the screen to be data a, a, u, and d, respectively.
At the time of recording, these ch1 and ch2 data are recorded in the order of data a on the upper side of the screen, data a on the lower side of the screen, and data d on the lower side of the screen. The ch1 data and the ch2 data are arranged independently of each other.

It is assumed that the data thus recorded is subjected to reverse trick play. FIG. 6C shows the reproduced data in this case. As described above, since there may be a frame boundary in each trick play data recording area,
The data order at the time of reverse reproduction is not simply the reverse order of the data at the time of recording. For example, as shown in FIG. 6 (c), ..., Data n, dn, cn, bn, a, D n-1
, U n-1, an, a n-1, a n-1, ... Are reproduced in this order.

FIG. 6D shows a frame flag created based on the information indicating the frame boundary. The apparatus of Document 2 uses this frame flag to rearrange the reproduced data. However, in the example of FIG. 6C, since the reproduction data of the n-th frame is included between the reproduction data of the (n-1) th frame, it is not possible to rearrange the data using the frame flag.

Further, Japanese Patent Application No. 6 filed by the applicant of the present application earlier
Japanese Patent No. 244278 discloses a special reproduction method that does not require a tracking operation during reproduction. Also in this proposal, the reproduction data at the time of reverse reproduction is not simply the reverse order of the recorded data, and the data cannot be rearranged using the frame flag.

[0019]

As described above, in the conventional VTR which records in the special reproduction data recording area to enable the special reproduction of the encoded data, the frame boundary is formed in the special reproduction data recording area. Since it may exist, there is a problem that the data cannot be rearranged at the time of backward special reproduction of multi-channel encoded data. Further, even when the backward special reproduction without the tracking is adopted, there is a problem that the reproduced data cannot be rearranged in the reverse recording order.

The present invention has been made in view of the above problems, and multi-channel recording / reproducing in which multi-channel encoded data recorded in a special reproduction data recording area can be reproduced and rearranged in frame units. The purpose is to provide a device.

It is another object of the present invention to provide a multi-channel recording / reproducing apparatus capable of rearranging reproduction data in the reverse order of recording even during reverse special reproduction without tracking.

[0022]

According to a first aspect of the present invention, there is provided a multi-channel recording / reproducing apparatus for special reproduction data for generating special reproduction data for special reproduction from a data string in which coded data of a plurality of channels are multiplexed. A special reproduction data sequence in which special reproduction data of a plurality of channels are multiplexed is given from the generation means, and the special reproduction data sequence is rearranged,
The multi-channel recording / reproducing apparatus according to claim 4 of the present invention is provided with a data rearranging means for continuously outputting the special reproduction data of corresponding frames between the channels. Special reproduction data generating means for generating special reproduction data for special reproduction from an input data string in which data is multiplexed and outputting a special reproduction data string in which special reproduction data of a plurality of channels are multiplexed, and this special reproduction data generating means. A plurality of storage means for storing the special reproduction data for each channel and reading from the plurality of storage means, and continuously outputting the special reproduction data of corresponding frames between the channels. And a multi-channel recording / reproducing apparatus according to claim 5 of the present invention. A special reproduction data string obtained by reverse special reproduction for a recording medium on which the special reproduction data string is recorded from the multi-channel recording / reproducing apparatus according to claim 1 is given, and the special reproduction data string is rearranged. , And the reproduction data rearranging means for outputting the data in the frame in the normal order while outputting the frame in the reverse order.

[0023]

According to the first aspect of the present invention, in the special reproduction data string in which the special reproduction data of a plurality of channels are multiplexed, the special reproduction data of the corresponding frames are continuous between the channels by the data rearranging means. It is rearranged and output. As a result, on the reproducing side, it is possible to rearrange the data in frame units using the information indicating the frame boundaries.

In claim 4 of the present invention, the trick play data generating means generates a trick play data string in which trick play data of a plurality of channels are multiplexed from the input data string.
This trick play data sequence is stored in a plurality of storage means for each channel, and the read control means reads and outputs the trick play data of corresponding frames between the channels so as to be continuous.

According to a fifth aspect of the present invention, the special reproduction data sequence rearranged so that the special reproduction data of the corresponding frames between the channels are continuous is obtained by the reverse special reproduction to the magnetic medium in which the special reproduction data sequence is recorded. The generated special reproduction data sequence is given to the reproduction data rearranging means. The reproduction data rearrangement means reverses the frame order regardless of the data order of the input special reproduction data sequence, and
The data in the frame is output in the normal order.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are block diagrams showing an embodiment of a multi-channel recording / reproducing apparatus according to the present invention.
FIG. 1 shows a recording system, and FIG. 2 shows a reproducing system.

Coded data received by a receiver circuit (not shown), for example, MPEG standard coded data, is input to the input terminal 1. This encoded data is given to the data extraction circuit 2. The data extraction circuit 2 extracts special reproduction data from the input encoded data. For example,
The data extraction circuit 2 extracts the intra-frame compressed data as the data for special reproduction and outputs it to the special reproduction dedicated data generation circuit 3. The special reproduction dedicated data generation circuit 3 reduces the data amount according to the capacity of the special reproduction data recording area on the magnetic tape. For example, the special reproduction dedicated data generation circuit 3 extracts only the direct current (DC) component of the intra-frame compressed data, reduces the data amount, and outputs the special reproduction data.

The special reproduction dedicated data generation circuit 3 supplies the special reproduction data of the first channel to the frame memory M1 and the special reproduction data of the second channel to the frame memory M2. Similarly, the special reproduction data of the nth channel is given to the frame memory Mn. Thus, the special reproduction data of the first to n-th channels are stored in the frame memories M1 to Mn in frame units, respectively.

The read circuit 4 includes frame memories M1 ...
When one frame of completed data (frame data) is stored in Mn, the frame data stored in the frame memories M1 to Mn are sequentially read and output to the time flag addition circuit 6 via the switch circuit 5.

The read circuit 4 does not read the frame data other than the corresponding frames from all the other channels during the read period of the frame data of the predetermined channel. For example, the read circuit 4
Reads frame data from the frame memories M1 to Mn one frame at a time. Further, for example, the read circuit 4 may sequentially and periodically read a fixed amount of data from each of the frame memories M1 to Mn. As a result, during the reading period of the frame data of the predetermined frame memory, the frame data of two frames is not read from the other frame memory. Further, the reading circuit 4 adds a frame flag which is inverted for each frame to the data from each of the frame memories M1 to Mn and outputs it.

The switch 5 is controlled by the reading circuit 4 to output the outputs of the frame memories M1 to Mn to the time flag adding circuit 6. The time flag adding circuit 6 packetizes the input frame data in a predetermined packet unit, adds a time flag corresponding to the time sequence in the bit string of each packet to the beginning of each packet, and specially reproduces it at the output terminal 6. It is designed to be output as packet packet data. The number of packets of 1-frame data differs for each frame.

The packet data from the output terminal 6 is applied to a recording circuit (not shown) and recorded on a magnetic tape. In this case, the recording circuit records the packet data from the output terminal 6 only in the special reproduction data recording area of the magnetic tape (not shown).
It is possible to record a plurality of packet data in one trick play data recording area.

A signal from a reproduction circuit (not shown) is applied to the input terminal 11 of FIG. The reproducing circuit reproduces the magnetic tape and digitizes it to obtain reproduced data. The reproduction circuit
Only the packet data of the special reproduction packet is extracted from the reproduction data and supplied to the input terminal 11.
This packet data is stored in the time flag detection circuit 12 and the memory.
Given to 14. The time flag detection circuit 12 detects the time flag added at the time of recording from the input packet data and outputs it to the control circuit 13. The memory 14 is controlled so that writing and reading are controlled by the control circuit 13, stores the input packet data, and outputs the read data to the switch 16 and the frame flag detection circuit 15.

The control circuit 13 controls writing and reading of the memory 14 based on the inputted time flag. That is, when the special reproduction data by the forward reproduction of the reproduction circuit is input, the control circuit 13 reads the packet data of the special reproduction packet from the memory 14 in the same time order as when the memory 14 was written, and the reverse direction. When the special reproduction data by reproduction is input, the packet data of the special reproduction packet in each frame is read out from the memory 14 in the reverse time order from the time of writing in the memory 14.

The frame flag detection circuit 15 detects the frame flag from the output of the memory 14 and controls the switches 16 and 19 at the changing point of the frame flag. The switch 16 outputs the packet data from the memory 16 to the memories 17 and 18 at the change point of the frame flag. The memories 17 and 18 have a capacity to store the packet data of all channels from the memory 16 for each frame, and when one is written, the other is read. The frame data from the memories 17 and 18 is given to the switch 19.

The switch 19 is controlled by the frame flag detection circuit 15 and operates in conjunction with the switch 16 to operate the memories 17, 18
The frame data read from is output to the output terminal 20. The frame data from the output terminal 20 is supplied to an image decompression circuit (not shown), restored to the original image data by a predetermined image decompression process, and then given to a display device (not shown).

Next, the operation of the embodiment thus constructed will be described with reference to the explanatory views of FIGS. 3A and 3B show the correspondence between the data of ch1 and ch2 and the position on the screen, FIG. 3C shows a recording data string, and FIG. 3D shows a frame flag. FIG. 3E shows a backward special reproduction data sequence, and FIG.
Shows the output of.

For example, MP input through the input terminal 1
The coded data of the EG standard is supplied to the data extraction circuit 2. Data of a plurality of channels is multiplexed in the encoded data, and the channels are independent of each other. The data extraction circuit 2 extracts, for example, the intra-frame compressed data from the input encoded data to create the special reproduction data, and the special reproduction dedicated data generation circuit 3
Output to. The special reproduction dedicated data generation circuit 3 generates special reproduction data according to the capacity of the special reproduction data recording area of the magnetic tape, for example, by extracting only the DC component from the intra-frame compressed data.

The special reproduction data is given to the frame memories M1 to Mn for each channel. Now, it is assumed that the input coded data includes ch1 and ch2 data. Further, in order to simplify the explanation, it is assumed that each frame is composed of packet data of 4 packets, and as shown in FIGS. 3 (a) and 3 (b), the data of ch1 is 4 in the vertical direction of the screen. The data is divided into packet data a, b, c, and d, respectively, and the data of ch2 is also divided into four in the vertical direction of the screen to be packet data A, B, C, and D, respectively.

In this case, the read circuit 4 uses ch1
Data is stored in the frame memory M1 and ch2 data is stored in the frame memory M2. Then, the read circuit 4 uses, for example, the frame memories M1 to ch1.
1 frame of data is continuously read, and then ch 2 of 1 frame of data is continuously read from the frame memory M2. After that, the data is alternately read from the frame memories M1 and M2 for each one frame, and the switch 5
Is output to the time flag adding circuit 6 via.

The time flag adding circuit 6 packetizes the data from the switch 5. FIG. 3C shows a data string from the time flag adding circuit 6. Note that FIG. 3 (c)
In, the subscripts of packet data a to d and a to d indicate frame numbers. Frame memories M1 and M2
The read circuit 4 adds a frame flag (FIG. 3D) indicating a frame boundary to the output from. As shown in FIG. 3D, the frame flag does not change during the output of the corresponding frame data of ch1 and ch2, and the frame flag changes at the switching timing of the corresponding frame data of ch1 and ch2. That is,
The encoded data input to the input terminal 1 is ch1, ch2
Although they are arranged independently of each other, as shown in FIG. 3C, the data from the time flag adding circuit 6 is c
Corresponding frames of h1 and h2 are continuously arranged. The time flag adding circuit 6 adds a time flag to the beginning of each packet and outputs it from the output terminal 7.

The reading of the frame memories M1 to Mn may be performed by outputting the data of the next frame after the output of all the data of the corresponding frames of all channels. Is output in the order of the position on the screen, it is not necessary to continuously arrange the frame data of one channel. For example, packet data ..., an, a, n, bn, a, n, cn, u, n, dn
, N, ... may be in that order.

FIG. 4 is for explaining the time flag, and FIG. 4A shows a packet data string.
(B) shows a recording format of a consumer digital VTR.

The time flag adding circuit 6 obtains the packet data string of FIG. 4A by packetizing the input data. The output of switch 5 is ch1, c
The packet data of h2 is included, and in FIG. 4A, the packets P11 to P15 of ch1 are indicated by diagonal lines. c
The packets of h2 are packets P21 to P25. Also,
FIG. 4A shows the correspondence between each packet and time. For example, the start timings of packets P22 and P13 are t4 and t5, respectively.

By the way, in the recording format of the consumer digital VTR, one sync block is recorded in each track as a recording unit, and one sync block is composed of 9 sync blocks.
It is 0 bytes long. FIG. 4B shows five sync blocks SB1 to SB5. In each sync block, the sync signal (SYNC) and ID are arranged in the first 6 bytes, and the parity is arranged in the last 8 bytes. Therefore, the data area of each sync block is 76 bytes. On the other hand, since the packet length of the transport packet of the MPEG2 is 188 bytes, 2 packets are allocated to 5 sync blocks and recorded.

Then, a space of 4 bytes is created in 5 sync blocks. The time flag adding circuit 6 assigns a time flag to this empty portion. That is, the time flag adding circuit 6
Is a sync block S for allocating the packet P22 of ch2.
A time flag indicating time t4 is arranged at the beginning of the data area of B1 to SB3, and a time flag indicating time t5 is arranged at the beginning of the data area of sync blocks SB3 to SB5 to which the packet P13 of ch1 is allocated.

The packet data at the output terminal 7 is recorded in the special reproduction data recording area of the magnetic tape by a recording circuit (not shown). There may be a frame boundary within the special reproduction data recording area.

In the reproducing system, the magnetic tape is reproduced by a reproducing circuit (not shown) and digitized to obtain reproduced data. The packet data of the special reproduction data recorded in the special reproduction data recording area of the reproduction data is input to the input terminal 11. This packet data is given to the time flag detection circuit 12 and the memory 14. The time flag detection circuit 12 detects a time flag from the packet data and outputs it to the control circuit 13.

Now, it is assumed that the reproduction circuit performs the forward special reproduction. In this case, the reproduction order of the packet data is the same as the recording order. Therefore, the control circuit 13
The packet data stored in the memory 14 is read in the order of writing and is output to the switch 16. The packet data read from the memory 14 is also given to the frame flag detection circuit 15, and the frame flag detection circuit 15 detects the frame flag in the packet data.

The switch 16 switches at the changing point of the frame flag and supplies the data of the corresponding frame of all channels to the memory 17 or the memory 18. When writing to the memory 17, reading from the memory 18 is performed, and when writing to the memory 18, reading from the memory 17 is performed. The packet data from the memories 17 and 18 is output from the output terminal 20 via the switch 19. By depacketizing and decoding the packet data from the output terminal 20, the forward special reproduction image can be restored.

Here, it is assumed that the reproducing circuit performs reverse special reproduction. In this case, as shown in FIG.
The control circuit 13 uses the time flag to read the data from the memory 14 on a frame-by-frame basis in the reverse order of recording.

Now, assume that the output of the time flag addition circuit 6 of the recording system is the packet data string shown in FIG. 5A and 5B are for explaining the output of the reproduction system in this case. FIG. 5A shows special reproduction data inputted to the input terminal 11, and FIG. 5B shows an output of the memory 14. ing. In FIG. 4A, it is assumed that one frame is composed of three packet data, and the packet P of ch1 is
It is assumed that 11, P12, P13 and ch2 packets P21, P22, P23 are corresponding frames.

It is assumed that the packet data string shown in FIG. 5A is input through the input terminal 11 during a predetermined period. This packet data string is given to the time flag detection circuit 12 and is also given to the memory 14 and stored while being controlled by the control circuit 13. The control circuit 13 returns the packet data sequence in each frame in the recording order and outputs it. For example, packets P23, P13, P22, stored in the memory 14
For P12, P21, and P11, their time flags are t
6, t5, t4, t3, t2, and t1, the control circuit 13 reads and outputs these packets in the order of time flags, that is, the packets P11, P21, P12, P22, P13, and P23 ( FIG. 5B).

The packet data read from the memory 14 is alternately given to the memories 17 and 18 at the changing points of the frame flag, and is switched for each corresponding frame of ch1 and ch2.
It is output from the output terminal 20 via 19. Although this output is in reverse frame order, each frame is a normal sequence packet data sequence. As a result, in the image expansion circuit (not shown), each frame data can be decoded to restore the original image data, and the backward special reproduction image can be displayed.

As described above, in this embodiment, in the recording system, the data of the corresponding frames of all channels are continuously arranged. As a result, in the reproduction system, the backward reproduction data can be rearranged using the frame flag. In addition, the same effect can be obtained during reverse reproduction without tracking.

[0056]

As described above, according to the present invention, multi-channel encoded data recorded in the special reproduction data recording area can be reproduced and rearranged in frame units, and tracking is unnecessary. Even in the backward special reproduction, the reproduction data can be rearranged in the reverse recording order.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a recording system of a multi-channel recording / reproducing apparatus according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a reproducing system of a multi-channel recording / reproducing apparatus according to the present invention.

FIG. 3 is an explanatory diagram for explaining the operation of the embodiment.

FIG. 4 is an explanatory diagram for explaining the operation of the embodiment.

FIG. 5 is an explanatory diagram for explaining the operation of the embodiment.

FIG. 6 is an explanatory diagram for explaining problems of the conventional example.

[Explanation of symbols]

 4 ... Readout circuit, M1 to Mn ... Frame memory

Claims (6)

[Claims] 1. A special reproduction data string in which special reproduction data of a plurality of channels is multiplexed is provided from special reproduction data generating means for generating special reproduction data for special reproduction from a data string in which encoded data of a plurality of channels is multiplexed. A multi-channel recording / reproducing apparatus comprising a data rearranging means for rearranging the special reproduction data sequence and continuously outputting the special reproduction data of corresponding frames between channels. 2. The multi-channel according to claim 1, wherein the rearrangement means outputs frame information indicating a switching point of a frame of the special reproduction data string together with the rearranged special reproduction data string. Recording / playback device. 3. The rearrangement means packetizes the rearranged special reproduction data string in units of a predetermined packet, and adds time information to each packet and outputs the packet. The multi-channel recording / reproducing apparatus described in. 4. Special reproduction data for generating special reproduction data for special reproduction from an input data string in which encoded data of a plurality of channels are multiplexed and outputting a special reproduction data string in which special reproduction data of a plurality of channels are multiplexed. The generation means, a plurality of storage means for storing the special reproduction data from the special reproduction data generation means for each channel, and the reading from the plurality of storage means are controlled so that the frames corresponding to the respective channels are controlled. A multi-channel recording / reproducing apparatus comprising: a read control unit for continuously outputting the special reproduction data. 5. A special reproduction data string obtained by reverse special reproduction from a recording medium on which the special reproduction data string from the multi-channel recording / reproducing apparatus according to claim 1 is recorded, and the special reproduction data string is provided. Rearrange
A multi-channel recording / reproducing apparatus comprising reproduction data rearranging means for outputting a frame in a reverse order and a frame in a normal data order. 6. The trick play data sequence is packetized in a predetermined packet unit and time information is added to each packet, and the play data rearrangement means is based on the time information. 6. The multi-channel recording / reproducing apparatus according to claim 5, wherein the special reproduction data strings are arranged in a normal order.