JP2003051161A - Digital recording apparatus and digital recording and reproduction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To most efficiently absorb roughness and fineness when the roughness and fineness are in the input rate of a packet stream to be recorded. SOLUTION: The digital recording apparatus is provided with a time stamp counter which is synchronized with a track to record and counts time at a fixed period, and a recording signal processing means which forms a recording track on a recording medium through a storage means to temporarily store the value of the time stamp counter by adding it to an inputted packet and records the packet on the track recording range defined by the value of the time stamp counter. The time stamp counter counts by synchronizing with the most forward phase within the defined recording range of track.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital recording device and a digital recording / reproducing device for recording information such as video, audio and data which are digitized and transmitted.

[0002]

2. Description of the Related Art In recent years, digital recording devices and digital recording / reproducing devices for recording digitized video signals and audio signals have been put into practical use and proposed. For example, Japanese Patent Laid-Open No. 09-2
An example is described in Japanese Patent Publication No. 04738. An example of a conventional digital recording / reproducing apparatus will be described below with reference to the drawings.

FIG. 11 is a block diagram of a conventional digital recording / reproducing apparatus. In FIG. 11, 1 is an input terminal, 2 is input means, 3 is a time stamp counter, 4 is time stamp adding means, 5 is first storage means, 6 is recording signal processing means, 7 is second storage means, 8 is a tape-shaped recording medium,
Reference numeral 9 is a cylinder, 10 is a recording / reproducing head, 11 is a reproduction signal processing means, 12 is a packet output means, and 13 is an output terminal.

The operation of the digital recording / reproducing apparatus configured as described above will be described below. From the input terminal 1, digital bit stream signals such as video, audio, and data are input as fixed-length packet data. The packet data may be a transport packet of MPEG2 or another transport packet of digital broadcasting. The input means 2 analyzes data for the packet signal input from the input terminal 1,
Select the data necessary for recording, or extract the clock reference data from the packet signal,
A clock synchronized with the stream to be recorded is generated by the LL lock. The time stamp counter 3 counts the time in synchronization with the recording operation. At this time, the time stamp is counted with the clock synchronized with the PLL lock with respect to the clock reference extracted by the input means 2. The time stamp adding means 4 acquires the time value of the time stamp counter 3 every time a packet is input, and adds it to the packet. The input packet with the time stamp is sequentially passed through the first storage means 5,
It is input to the recording signal processing means 6. Recording signal processing means 6
Then, signal processing according to the recording format is performed to generate a recording signal. For example, using the second storage means 7,
A packet is converted into a block (sync block) which is a unit for recording, an error correction code for compensating a data error caused by recording / reproducing is added, and recording tracks are sequentially formed on the second storage means 7. To do. Finally, for the data read from the second storage means 7 in track units,
A recording signal is generated by performing modulation for recording. Also,
Immediately before recording, amplification processing of the recording signal is also performed. The modulated recording signal is recorded on the tape-shaped recording medium 8 using the rotating cylinder 9 and the recording head 10 attached to the cylinder. FIG. 9A shows the arrangement of the recording tracks on the tape recording medium. Reference numeral 35 is a recording track, and 36 is a locus along which the recording head 10 scans during recording and reproduction. Next, the operation of the time stamp counter 3 and the recording method will be described with reference to FIG. FIG. 5A shows an input packet sequence. FIGS. 5B and 5C show the operations of the first time stamp counter and the second time stamp counter. As shown in FIG. 5 (e), recording tracks 0, 1
At the timing of generating (track0 and track1) by the recording signal processing means 6, the first time stamp counter is 0, 1
The second time stamp counter counts up from 0 to a fixed value in one track period in each track. That is, both the first time stamp counter and the second time stamp counter count in synchronization with the track. Note that in this example, the first time stamp is 0, 1, 2,
It is counted as 3, 4, 5 and is reset at the head timing of track 0 and returns to 0. Using such a time stamp counter, for example, 18 shown in FIG.
For the packet input at the timing of, the input time is acquired at the time stamp value of 19 and added at the front of the packet as shown at 20. The packet added with the time stamp is recorded on the recording track as indicated by reference numeral 21. That is, a time stamp counter that counts the input timing of the packet input at the timing shown in FIG. With reference to this, it becomes possible to reproduce the packet at substantially the same timing as when recording. Usually, time information is also transmitted at the same time in packet data for encoding and transmitting video and audio by MPEG2 or the like, and if the relative transmission timing changes during recording / reproduction, the time information cannot be reproduced correctly. Since the video and audio cannot be correctly decoded, the recording packet timing is reproduced by such a time stamp in order to prevent this.

However, since the value of the time stamp counter, which counts periodically with a finite length of the track period, is added to the input packet, it does not mean that the packet can be recorded at any track position. It is necessary to set a certain limit on the position. That is, when recording is performed on the tape for at least the period of the time stamp counter, the reproduction timing cannot be known.

This limitation is defined by the recording format of the recording device. For example, the recording track periodically performs signal processing operation for the same period as the time stamp counter period (N = 6 in this example), and the track number Consider the case where is added in N track periods. Furthermore, at the count timing of the time stamp counter, it is assumed that the recording track operates with track numbers 0 to 5 in synchronization with the time corresponding to the first time stamp counter 0 to 5, and the time stamp added to the packet Assuming that there is a limitation due to the recording format that a packet must be recorded in a range of plus or minus one track from the recording track position corresponding to the value, the following two recording methods, a real-time recording method and a head-justified recording method, will be described. explain.

FIG. 6 shows a packet recording method of the real-time recording method. The first time stamp counter and the second time stamp counter in FIGS. 6B and 6C count 6 tracks in synchronization with tracks 0 to 5 as shown in FIG. As shown by 22 in FIG. 6, the data input at a certain timing and added with the time stamp, for example, the packet input in the period of the track '2' in FIG. According to the standard, it is possible to record on ± 1 track, but after the time stamp is added, it is passed through the first storage means 5 and is generally located at the position of the recording track 2 corresponding to the added time stamp as shown in FIG. Will be recorded. Further, in order to perform the time stamp counter operation synchronized with such a recording track, the track on which the recording process is performed is at the beginning of the time stamp counter cycle, that is, at the beginning position where the first time stamp becomes '0'. The recording process may be reset as indicated by 23 in FIG. Alternatively, at the same timing, the time stamp counter may be reset at the head of the track '0' of the recording process, as indicated by 23 in FIG.

Thus, in the real-time recording system,
The input packet is recorded at almost the same position as the recording track position corresponding to the time stamp counter value. In this case, in addition to the processing delay of the circuit,
When a packet is input at an instantaneous rate higher than the recording rate, the packet is accumulated in the first storage means 5 to allow a delay of up to one track in the plus direction, as shown at 24 in FIG. Has been done.

Next, FIG. 7 shows a packet recording method of the head-justified recording method. The difference from the real-time recording method is that the recording position on the minus side of the plus / minus one track range defined by the recording format is used in the head-down method. The first time stamp counter and the second time stamp counter are respectively shown in FIG.
As shown in (b) and (c), 6 tracks synchronized with tracks 0 to 5 are counted. As shown at 25 in FIG. 7, the packets input during the period of track “2” are packed and recorded in order from the beginning of track “2”. Therefore, the packet input at the timing near the beginning of the track is recorded on the track at almost the input position, and the packet input at the timing near the trailing end of the track may be left justified to the beginning of the track in some cases. Will be recorded.
All of the input packets are sequentially written from the beginning of the track in the second storage means 7,
You can easily record to a position within plus or minus one track. In addition to the processing delay of the circuit, when a packet is input at an instantaneous rate higher than the recording rate, a delay of up to one track is permitted in the plus direction. Also,
In order to perform the time stamp counter operation in synchronization with such a recording track, the time stamp counter and the phase of the recording process may be synchronized by the reset operation at the timing indicated by 26, as in the case of real time recording.

Next, the operation during reproduction will be described. The data recorded on the tape-shaped recording medium 8 by the above method is reproduced by the reproducing head 10. The reproduced data is corrected by the reproduced signal processing means 11 for error during reproduction by using the error correction code added during recording. At this time, the storage means 2 is used to temporarily store the data. Also, the packet data is reconstructed from the next reproduced recording block. Further, the packet output means 12 compares the value of the time stamp added to the reproduced packet with the value of the time stamp counter operating at the time of reproduction, and if they match, the packet is output from the output terminal 13. By outputting the packet in accordance with the value of the time stamp counter, it is possible to reproduce the packet at a timing substantially matching the packet timing input during recording.

Further, in the recording apparatus for recording a video as in this example, it is possible to separately generate data for special reproduction and record it at a specific position on the tape-shaped recording medium. Figure 9
An example of the recording position is shown in (b). 35 is a recording track, 37
Is the trajectory of the head during special playback (for example, 8x speed), 38 is the trajectory of the head during special playback (-8x), 39 is the data recording position for 8x special playback, and 40 is the -8x special playback. It is a data recording position for use. In this way, by previously recording the data for special reproduction at the position where the head passes during special reproduction, special reproduction can be performed by reproducing the data.

[0012]

However, in the above-mentioned configuration, in the case of the real-time recording method shown in FIG. 6, the packet recording range defined by the recording format has a width of two track periods in this example. Nevertheless, as shown at 24 in FIG. 6, only a +1 track delay is allowed when recording a packet. Also,
In the head-justified method shown in FIG. 7, when recording from the head of the track at the trailing end of the track, the recording range of up to ± 1 track is fully utilized, and in some cases a delay of 2 tracks is allowed. Similar to real-time recording, only the delay amount of +1 track is permitted near the beginning of the track. Therefore, in this example, the recording range of ± 1 track, which is defined as a standard, is not used effectively, and when a high-rate packet is input and the packet interval is coarse / fine, delay of +1 track There is a problem that the amount cannot be recorded because the density of the rate cannot be absorbed and overflow occurs.

When recording special reproduction data,
As shown in FIG. 8, special reproduction data must be recorded between the areas in which normal packets are recorded. In this case, 28 and 30 represent special reproduction data, which are recorded on track 0 and track 1, respectively. Therefore, a packet of normal data cannot be recorded at this recording position. So 29, 31, 32, 3
The packets indicated by Nos. 3 and 34 need to be recorded after the trick play data after the special play data, as indicated by arrows.
As described above, it is necessary to record the packet data for normal reproduction and the recording process for special reproduction data on one recording track, and it is advantageous that the recordable range of the normal recording packet is large and can be effectively used. Is. However,
As described above, in the conventional recording methods such as the real-time recording and the head-justified recording method, the recording range amount defined by the recording format is only +1 track at maximum, so the packet is delayed beyond 1 track. If it is recorded, it will exceed the specifications of the recording format.

As described above, in the conventional recording method, the recordable range of the normal recording packet (± 1 in this example) is used.
There was a problem that all tracks could not be used effectively.

In view of the above problems, the present invention effectively uses the entire recording range on the recording track permitted by the standard, and is capable of recording an input packet stream having a higher rate and a sharp rate fluctuation. It is an object to provide a recording device.

[0016]

In order to solve the above problems, the first aspect of the present invention synchronizes with input means to which a fixed-length packet is input and a track to be recorded, which is N times the track ( N is a natural number), a time stamp counter that counts time in any fixed cycle, time stamp adding means that adds the count value of the time stamp counter to the input packet, and a recording track is formed on a recording medium. Recording signal processing means for recording the packet in a recording range defined by the count value of the added time stamp counter, wherein the time stamp counter is the frontmost one in the specified recording range. The digital recording apparatus is characterized in that the phase is adjusted to the recording track position and the count is performed in synchronization.

According to a second aspect of the present invention, the time is counted in a fixed cycle which is N times (N is a natural number) the track in synchronization with the input means for inputting a fixed-length packet and the track to be recorded. A time stamp counter, a time stamp adding means for adding the count value of the time stamp counter to the input packet, a recording track is formed on a recording medium, and the time stamp counter is defined by the added count value of the time stamp counter. Recording signal processing means for recording the packet within a recording range, reproduction signal processing means for reproducing the packet recorded on the track of the recording medium, and N times the track (N is Time stamp counter that counts the time at any fixed cycle (natural number) and is added to the replayed packet. And a packet output unit for comparing the count value of the time stamp counter and the count value of the time stamp counter and outputting the reproduced packet by synchronizing both count values, and at the time of recording, the time stamp counter is defined as described above. The time stamp counter counts in synchronization with the recording track position at the frontmost position in the track recording range in synchronization with the phase.
The digital recording / reproducing apparatus is characterized in that the phase is counted in accordance with the reproduction track position at the rearmost position of the specified track recording range.

In a third aspect of the present invention, the time is counted in a fixed cycle which is N times (N is a natural number) the track in synchronization with the input means for inputting a fixed-length packet and the track to be recorded. A time stamp counter, a time stamp adding means for adding the count value of the time stamp counter to the inputted packet, a special reproduction data generating means for generating data for special reproduction, and the recording track formed on a recording medium. And a recording signal processing means for recording the packet and the trick-play data within a recording range defined by the value of the added time stamp counter, wherein the time stamp counter is within the defined recording range. A digital recording apparatus which counts in synchronization with the recording track position at the forefront of .

In a fourth aspect of the present invention, the count value of the time stamp counter counted in N track cycles (N is a natural number) is track 0, track 1 ,.
When it corresponds to a recording track group that is repeated in one N track cycle, the recording range of the packet to the recording track is plus the recording position of the track corresponding to the value of the time stamp added to the packet. The digital recording device or the digital recording / reproducing device according to any one of claims 1 to 3, wherein the digital recording device or the digital recording / reproducing device is defined within a range of minus one track.

A fifth aspect of the present invention is characterized in that the fixed length packet is an MPEG2 transport stream packet having a packet length of 188 bytes.
4 is a digital recording device or a digital recording / reproducing device.

According to a sixth aspect of the present invention, the fixed-length packet is a transport stream packet having a packet length of 140 bytes, and the digital recording apparatus or the digital recording apparatus according to any one of claims 1 to 4. It is a recording / reproducing device.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram of a digital recording apparatus according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes an input terminal to which a bit stream composed of a packet signal sequence to be recorded such as video, audio, and data is input, and the recording bit stream is input via the input means 2. Further, 3 is a time stamp counter, and 4 is a time stamp adding means. Also, 6
A recording control unit 1 controls the signal processing unit 62 based on the output signal of the time stamp counter. The output of the time stamp adding means 4 is input to the signal processing means 62 via the first storage means 5. The second storage means 7 is used by the signal processing means 62. After that, the recording head 10 provided on the rotary cylinder 9 forms a track on the tape-shaped recording medium 8 for recording.

The operation of the digital recording apparatus configured as described above will be described below with reference to the drawings.

In FIG. 1, the recording packet may be, for example, MPEG2 transport packet data or other transport packet for digital broadcasting or the like. These are fixed-length data strings, and data such as a plurality of types and programs can be multiplexed in packet units and transmitted. Of these, in the input means 2, the packet signal input from the input terminal 1 is transmitted. On the other hand, the data is analyzed, the data required for recording is sorted out, and the clock reference data is extracted from the packet signal, and the clock synchronized with the recording stream is generated by the PLL lock. A time stamp counter 3 counts the time in synchronization with the recording operation. At this time, the time stamp counter 3 counts with the clock synchronized with the PLL lock with respect to the clock reference extracted by the input means 2. Four
Is a time stamp adding means, which acquires the count value of the time stamp counter 3 every time a packet is input and adds it to the packet. The input packets to which the time stamps are added are sequentially temporarily stored in the first storage means 5.

The signal processing means 62 performs signal processing according to the recording format to generate a recording signal. For this purpose, the second storage means 7 is used to convert the packet into a sync block for recording, and an error correction code for compensating for a data error caused by recording / reproducing is added,
A recording track is formed on the storage means 7, and finally, the data sequentially read from the second storage means 7 is modulated for recording to generate a recording signal.

Reference numeral 9 is a rotary cylinder, and 10 is a recording head attached to the cylinder.
The modulated recording signal is recorded. Next, the operation and recording method of the time stamp counter 3 and the recording control means 61 will be described with reference to FIG.

The values of the first time stamp and the second time stamp are added to the input packet, and the first time stamp counter counts in synchronization with the track (in this example, it counts in 6 track cycles). ), And that the second time stamp counter 2 counts the time in the track is the same as the prior art example described with reference to FIG. However, in the embodiment of the present invention, the operation of the time stamp counter is different from the conventional example. As shown in FIG. 4, the first time stamp counter (FIG. 4 (b))
Is the recordable range ± 1 on the recording track (Fig. 4 (e)) for packets with that time stamp counter value.
In synchronization with the frontmost position of the track, that is, the count phase of the time stamp is 1 more than that of the recording track.
Tracks are counted in advanced phase. This is the case when there is a constraint that the packet must be recorded at the position of plus or minus one track with respect to the recording track position indicated by 15 in FIG. 4 corresponding to the value of the time stamp counter in the standard as in this example. In the case where the packet is immediately recorded via the first storage means 5 without being delayed in the first storage means 5, among the areas indicated by the prescribed recordable range (15 in FIG. 4), This is the phase in which packets are recorded at the earliest timing. This is 16 in FIG.
As shown in, the track '5' is loaded into the recording track processing at the beginning of the count cycle of the time stamp counter, or the first time stamp counter and the second time stamp counter are reset at the head of the recording track 5. It can be realized.

In this embodiment, the recording control means 61 is controlled by instructing the signal processing means 62 to load the recording track '5' based on the count phase of the time stamp counter 3. That is, the value of the time stamp counter 3 is input to the recording control means 61, and in the recording control means 61, the first time stamp counter, which is the head of the time stamp counter, is “0” and the second time stamp counter is the second time stamp counter.
The time stamp counter generates a load pulse at the timing of "0" and outputs it to the recording signal processing means 62, as shown at 16 in FIG. In the recording signal processing means 62,
The recording track process is realized by the load pulse by performing the load operation so that the track becomes “5”.
Therefore, the illustrated packet input during the period of the recording track 1 in FIG. 4 is input when the time stamp 1 counts “2”, but the first storage means 5 stores no packet data. If not, the first
The data is recorded immediately on the recording track 1 only by passing through the storage means 5. Even if some packets are accumulated in the first storage means 5 and may not be recorded immediately, as shown in 17 of FIG. 4, in order to perform recording within the standard, a delay of up to 2 tracks is required. forgiven. Therefore, even if the instantaneous packet input rate exceeds the recording rate, it is possible to store up to two tracks of packet data corresponding to the recordable range ± 1 track on the tape in the first storage means 5, and as a result As compared with the case described in the conventional example, there is an effect that even if a large number of packets are input at a recording rate exceeding the fixed period, recording can be performed without failure. In other words, it is possible to absorb the density of the packet input rate more than before, and it is possible to effectively use the entire recordable recording track range and perform an efficient recording operation.

(Second Embodiment) The second embodiment is different from the first embodiment in that it has means for reproducing packet data recorded on a recording medium. A block diagram of the digital recording apparatus according to the second embodiment is shown in FIG.

Since the recording process is exactly the same as that of the first embodiment, its explanation is omitted.

Reference numeral 11 is a reproduction signal processing means, 12 is a packet output processing means, and 13 is an output terminal. In FIG. 2, the time stamp counter 3, the first storage means 5, and the second storage means 7 are commonly used in the recording process and the reproducing process. However, these respective means may be provided separately for recording processing and reproduction processing, instead of being made common.

The data recorded on the tape-shaped recording medium 8 by the method described in the first embodiment is reproduced by the reproducing head 10. In the reproduced data, the reproduced signal processing means 11 corrects the error caused by the recording / reproduction by the error correction code. At this time, the reproduction data is temporarily stored using the storage means 2. Then, the recorded packet data is reconstructed from the reproduction data in which the error is corrected. Next, the reproduced packets are temporarily stored in the first storage means 5 sequentially with the time stamp added at the time of recording. Reproduced packets are sequentially read from the first storage means 5, and the value of the time stamp added to each packet is compared with the value of the time stamp counter 3 operating at the time of reproduction in the packet output means 12, and both are read. If they match, the packet is output from the output terminal 13. The above processing and the operation of the time stamp counter 3 will be described in detail below with reference to FIG.

FIG. 10 shows the count phase of the time stamp counter 3 during reproduction. FIG. 10A shows a track sequence to be reproduced. In this example, the count cycle of the time stamp counter is a unit of 6 tracks, and tracks 0 to 5 are sequentially reproduced at the same cycle corresponding thereto. In FIG. 10B, the first time stamp counter,
FIG. 10C shows the count timing of the second time stamp counter. These configurations are exactly the same as the configurations of the time stamp counter at the time of recording. Further, FIG. 10 (d) shows the timing at which the packet is output after the reproduction packet time stamp matching shown at 41 in FIG. FIG. 10E shows the timing of all output packets output from the output terminal 13. Figure 10
As shown in (a), (b), and (c), when outputting a packet recorded at the position indicated by 41 in FIG. 10, that is, recording track 1, the value of the time stamp added to this packet is , The range of ± 1 track (timestamp 1
Is assumed to be a value in the range of 0 to 2) shown in the standard. On the contrary, the packet having the time stamp value at the timing 44 in FIG. 10 starts from the track position corresponding to the time stamp value in FIG.
It is stipulated that the data be recorded in the range of ± 1 track indicated by the dotted line of 45. Therefore, by counting the count phase of the time stamp counter one track later than the reproduction track phase as shown in FIG. 10, the reproduced packet (41 in FIG. 10) is reproduced most efficiently after being reproduced. It is possible to output at a timing that coincides with the time stamp counter as shown by 43 in FIG. 10 within the two track period. This indicates that the above processing can be realized by having a buffer for two tracks as the first storage means 5, and the first storage means 5 can be configured to the minimum. For this purpose, control is performed so that the reproduction track becomes 1 at the beginning of the count cycle of the first time stamp counter, as shown at 42 in FIG. By resetting, the time stamp counter operation in the above phase is performed. Of course, in order to achieve the counting operation in the above phase, the time stamp counter value may be loaded with an appropriate value at another timing, or the phase of the reproduction track may be controlled.

As described above, during reproduction, the phase of the time stamp counter is set to the range in which the packet to which the time stamp value is added can be reproduced (± 1 track in this example: equivalent to the dotted line period 45 in FIG. 10). It is preferable to count in synchronization with the rearmost position (in this example, the counting phase 44 of FIG. 10 matches the rearmost position of the recording track range 45 of FIG. 10 in which a packet having that value can be recorded). With the above-described configuration, the recording / reproducing apparatus according to the present embodiment has the first storage unit 5 even when the instantaneous packet input rate exceeds the recording rate as shown in the first embodiment during recording. It is possible to increase the allowable amount of packets stored in the packet compared to the case described in the conventional example, and it is possible to record without breaking even if more packets are input over the recording rate for a certain period. Have an effect. That is, the density of the input packet rate can be absorbed more than before, and the capacity of the first storage means 5 can be minimized during the reproduction to efficiently reproduce the packet.

(Third Embodiment) The third embodiment is different from the first embodiment in that it has means for generating special reproduction data at the time of recording and recording it on a recording medium like normal packet data. That is the point. A block diagram of the digital recording apparatus according to the third embodiment is shown in FIG.

Since the normal recording process is exactly the same as that of the first embodiment, its explanation is omitted. In FIG. 3, reference numeral 14 is a trick-play data generating means.

In the third embodiment, normal packet data is recorded at the time of recording, and at the same time, separate data is generated for special reproduction and recorded at a specific position on the tape-shaped recording medium. FIG. 9B shows an example of the recording position. 35 is a recording track,
37 is the trajectory of the head during special playback (eg 8x speed), 3
8 is the trajectory of the head during special playback (-8 times speed), and 3
Reference numeral 9 is a data recording position for special reproduction at 8 × speed, and 40 is a data recording position for special reproduction at −8 × speed. In this way, by previously recording the data for special reproduction at the position where the head passes during special reproduction, special reproduction can be performed by reproducing the data. As the trick-play data, the recorded image can be confirmed when the tape is reproduced at a high speed, and it is preferable to use the data obtained by cutting the recorded image data in frame units. In the trick-play data generating means 14 of FIG. 3, for example, when recording an MPEG2 transport packet, it is considered that only I-frame data compressed only by intra-frame compression is extracted from the MPEG2 stream and created as trick-play data. To be Since the I frame data is compressed by the intra-frame compression process, it is possible to decompress a single frame data to obtain a reproduced image even if there are no preceding and succeeding frames during special reproduction. When recording such special reproduction data, as shown in FIG. 8, the special reproduction data must be recorded between the areas where normal packets are recorded.
In this case, 28 and 30 represent special reproduction data, which are recorded on track 0 and track 1, respectively. Therefore, a packet of normal data cannot be recorded at this recording position. So 29, 31, 3
The packets indicated by 2, 33, and 34 need to be recorded after the special reproduction data with a delay, as indicated by the arrows. At this time, in both the real-time recording and the head-justified recording method as described in the conventional example, since the recording range amount defined by the recording format is only +1 track at maximum, there is special reproduction data. If the packet is recorded with a delay over the track, the format regulation is exceeded, but in the present embodiment, as shown in FIG. 4 described in the first embodiment, the time stamp counter is set one track before the recording track. Since the shifts are counted, the input packet is allowed to have a maximum delay of +2 tracks in this example, as indicated by 17 in FIG. For example, in FIG. 4, the packet input during the period of track 4 is
Since the time stamp 1 counts 5, there is no problem even if there is special reproduction data 28 as long as it can be recorded in the range within +2 tracks as shown in the figure. Therefore, even in the recording / reproducing apparatus for recording such trick-play data, it is possible to perform a recording operation with a margin in the storage means 1 for one track as compared with the conventional recording method, and more packets can be recorded at the recording rate for a certain period. Even if the input exceeds the limit, there is an effect that recording can be performed without failure. That is, it is possible to absorb the density of the input rate more than before.

Although the recording device has been described in the third embodiment, a recording / reproducing device may be provided with the reproducing device shown in the second embodiment in the third embodiment.

In the first, second and third embodiments, the time stamp count cycle is described as a 6-track cycle, but the count cycle N may be a natural number other than 6.

In the first, second and third embodiments, the range on the recording track where the packet is recorded at the time of recording is added to the packet among the time stamps counted in 6 tracks. To the position on the recording track corresponding to the time stamp value
Although it has been described as an example that it is defined in the range of one track, it may be defined in a range different from ± 1 track and not more than N tracks (time stamp count cycle).

In the first embodiment, the second embodiment, and the third embodiment, the packet to be recorded or recorded / reproduced is described as a packet having a length of 188 bytes assuming an MPEG2 transport packet. It may be a case of recording / reproducing transport packets having different packet lengths such as transport packets (for example, 140 bytes) in the digital broadcasting system.

Incidentally, the present recording device or recording / reproducing device is
Although the apparatus for recording the packet data on the tape-shaped recording medium has been described as the first embodiment, the second embodiment, and the third embodiment, the recording medium may be a disk-shaped recording medium such as a hard disk or an optical disk.

[0044]

As described above, according to the present invention, the count phase of the time stamp counter, which indicates the recording timing of the input packet, is the most forward of the defined track range in which the packet to which a certain counter value is added can be recorded. By synchronizing with the position and counting, even if a large number of packets are input exceeding the recording rate for a certain period of time, recording can be performed without failure and the input rate density can be absorbed more. It has the effect that

[Brief description of drawings]

FIG. 1 is a block diagram of a digital recording device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a digital recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a digital recording device according to a third embodiment of the present invention.

FIG. 4 is a diagram for explaining a recording method of the digital recording device according to the first to third embodiments of the present invention.

FIG. 5 is a diagram for explaining a recording method according to a conventional technique.

FIG. 6 is a diagram for explaining a recording method based on a real-time recording method.

FIG. 7 is a diagram for explaining a recording method based on a head-justified recording method.

FIG. 8 is a diagram for explaining a trick-play data recording method according to a conventional technique.

FIG. 9A is a diagram showing a normal recording / reproducing system for a tape-shaped recording medium, and FIG. 9B is a diagram showing a recording / reproducing system for high-speed reproduction data on the tape-shaped recording medium.

FIG. 10 is a diagram showing a reproducing system of a digital recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 11 is a block diagram of a digital recording device according to a conventional technique.

[Explanation of symbols]

1 input terminal 2 input means 3 Time stamp counter 4 Time stamp adding means 5 First storage means 7 Second storage means 8 Tape-shaped recording medium 9 cylinders 10 Recording (or playback) head 11 Playback signal processing means 12 Packet output means 13 output terminals 14 Special reproduction data generation means 61 recording control means 62 signal processing means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/91 H04N 5/92 H 5/92 5/91 Z (72) Inventor Yoshiyasu Kuramoto Osaka Kadoma 1006, Kadoma, Ichimaji Matsushita Electric Industrial Co., Ltd. F term (reference) 5C018 EA01 NA05 5C053 FA20 FA21 GA11 GB06 GB38 JA22 KA05 5D044 AB05 AB07 BC01 CC01 DE17 DE27 DE39 EF02 EF05 5D077 AA07 BA04 CA02 DC06 DE13 DF01

Claims (6)

[Claims] 1. An input means for inputting a fixed-length packet, and a time stamp counter which synchronizes with a recording track and counts time at a fixed cycle of N times (N is a natural number) the track. A time stamp adding means for adding a count value of the time stamp counter to the input packet; and a recording track formed on a recording medium, and the recording track is formed within a recording range defined by the count value of the added time stamp counter. A digital signal recording means for recording a packet, wherein the time stamp counter counts in synchronization with the recording track position at the frontmost position in the specified recording range in phase. apparatus. 2. An input means for inputting a fixed-length packet, and a time stamp counter which synchronizes with a recording track and counts time at a fixed cycle of N times (N is a natural number) the track. A time stamp adding means for adding a count value of the time stamp counter to the input packet; and a recording track formed on a recording medium, and the recording track is formed within a recording range defined by the count value of the added time stamp counter. Recording signal processing means for recording a packet, reproduction signal processing means for reproducing the packet recorded on a track of the recording medium, and N times the track (N is a natural number) in synchronization with the reproduction track A time stamp counter that counts the time in a fixed cycle and the count added to the replayed packet. A packet output means for comparing the count value of the time stamp counter and the count value of the time stamp counter, and outputting the reproduced packet by synchronizing both count values; The recording track position at the frontmost position in the range is synchronized and counted, and at the time of reproduction, the time stamp counter matches the phase at the rearmost reproduction track position in the prescribed track recording range. A digital recording / reproducing device characterized by being counted. 3. An input means for inputting a fixed-length packet, and a time stamp counter which synchronizes with a track to be recorded and counts time at a fixed cycle of N times (N is a natural number) the track. Time stamp adding means for adding the count value of the time stamp counter to the input packet, special reproduction data generating means for generating data for special reproduction, and forming the recording track on a recording medium, and adding the recording track. A recording signal processing means for recording the packet and the trick-play data in a recording range defined by the value of the time stamp counter, wherein the time stamp counter is the frontmost one in the specified recording range. A digital recording device, which counts in synchronization with a recording track position in phase. 4. A count value of a time stamp counter counted in N track cycles (N is a natural number) corresponds to a recording track group repeated in N track cycles of track 0, track 1, ..., Track N-1. In this case, the recording range of the packet on the recording track is defined within a range of plus or minus one track with respect to the recording position of the track corresponding to the value of the time stamp added to the packet. 4. The digital recording device or digital recording / reproducing device according to claim 1. 5. The fixed-length packet has a packet length of 188.
The digital recording device or digital recording / reproducing device according to any one of claims 1 to 4, which is an MPEG2 transport stream packet which is a byte. 6. The fixed-length packet has a packet length of 140
5. The digital recording device or digital recording / reproducing device according to claim 1, wherein the transport recording packet is a byte.