JPH04271683A - Reproducing device - Google Patents

Abstract

PURPOSE:To present the reproducing device which can reproduce all the recorded pictures even when a pause instruction is outputted during reproducing. CONSTITUTION:The data of respective pictures to be successively reproduced at a DAT 50 (the data for four fields) are supplied to RAM 22A and 22B. For the RAM 22A and 22B, when one is in a write state, the other is in a read state. When a pause setting switch 39 is turned on in a normal reproducing state, the pause state is set after the data of pictures under writing (reproducing) are written to the end. When the pause state is canceled by turning on the set switch 39 again in the pause state, this data is read out from the RAM 22A and 22B, and the still picture due to this data id displayed on a monitor television receiver 29. Before the pause state is set, the data of pictures under reproducing can be stored in the RAM 22A and 22B without making an error rate adverse, and all the recorded pictures can be satisfactorily reproduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus for sequentially reproducing data for a plurality of screens of a MUSE signal, for example.

0002

[Prior Art] As a method for compressing the transmission signal band of television signals, MUSE (Multiple Sub-
nyquist Sampling Encoding
) is known. In the MUSE encoder, band compression is performed by line offset subsampling in the motion system, and by field offset and frame offset subsampling in the stationary system. On the other hand, in the MUSE decoder, in the motion system, an image is reproduced using only the signal of the current field by interpolation, and in the stationary system, the image is reproduced using the signals of the current field and the previous three fields by interframe and interfield interpolation.

[0003] In the MUSE system, high-definition television signals are transmitted. According to the high-definition standard, the number of scanning lines per frame is 1125, the interlace ratio is 2:1, the aspect ratio is 16:9, the field frequency is 60 Hz, and the line frequency is 33,750 Hz.

FIG. 15 shows the format of a television signal (hereinafter referred to as "MUSE signal") transmitted using the MUSE method. The MUSE signal has 480 samples of data on each of 1125 horizontal lines, with a frame pulse added to the beginning of each frame and a horizontal synchronization signal added to the beginning of each line.

[0005]

By the way, it is conceivable to record such a MUSE signal as still image data, for example, on a DAT (digital audio tape recorder).

As described above, in a still system, images are reproduced using signals of four fields, so when recording MUSE signals as still image data, it is desirable to record in units of four fields.

[0007] Although not mentioned above, the MUSE signal is 16.2MH
If sampled in z and there are 4 fields (2 frames), then 1125 x 2 x 480 = 1,080,000 samples. If one sample is 8 bits, 8,640,
000 bits (≒8.24 Mbits).

[0008] If this one screen worth of still image data is recorded on a DAT, the data recording speed on the DAT is 1
, 536,000 bits (48kHz x 2 channels x 1
6 bits), it will take 5.625 seconds. That is, in the video system, 4×1/60≈66.7 msec worth of data becomes 5.625 seconds worth of data in the DAT system.

Still image data recorded in this way is DA
When played from T, it takes 5.625 seconds to
Still image data for one screen is played back and written to the first memory, then still image data for the next screen is played back and written to the second memory.
1 from the first memory while being written to the first memory.
The average still image data for a screen is 84.3 (5.625 seconds/
66.7 msec) times, and this is the MUSE
The still image is supplied to a monitor television via a decoder and displayed.

[0010] When a pause (temporary stop) command is issued during playback, in most cases it can be considered that one screen of still image data is being played back. That is, the still image data for one screen is divided and reproduced before and after the pause. Considering the deterioration of the error rate during the transition period between the start and stop of the DAT drum and capstan, a still image based on still image data for one screen cannot be reproduced either before or after a pause.

[0011] Accordingly, the present invention provides a reproducing apparatus that can reproduce the entire recorded screen even if a pause command is issued during reproduction.

0012

[Means for Solving the Problems] A first invention is a playback device that sequentially plays back data screen by screen, which is provided with pause setting means, and when a pause is set by the pause setting means, the screen being played back is After the data is played back, it enters a pause state.

[0013] The second invention is a playback device that sequentially plays back data on a screen-by-screen basis, which is provided with pause setting means, and when a pause is set by the pause setting means, the playback position of the screen before the screen being played is set. After returning to , it enters a pause state.

[0014]

[Operation] In the first invention, when a pause is set, the data on the screen currently being played back becomes paused after it is played back, so the data on the screen being played back before entering the pause state causes a worsening of the error rate. can be obtained without incurring Therefore, it is possible to obtain a screen based on this data in a paused state or after the pause is released.

[0015] In the second invention, when a pause is set, the pause state occurs after returning to the playback position of the screen before the screen being played back, which causes a worsening of the error rate of the data on the screen being played back. You can get it after unpausing without needing to do so. Therefore, it is possible to obtain a screen based on this data after the pause is released.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. This example is an example in which the MUSE signal is recorded and reproduced as still image data using DAT.

FIG. 2 shows the configuration of the recording system. In the figure, a satellite broadcast signal captured by a satellite broadcast (BS) antenna 1 is supplied to a BS tuner 2. B.S.
The MUSE signal output from the tuner 2 is band-limited by a low-pass filter 3, further converted into a digital signal by an A/D converter 4, and then transferred to sides a and b of a changeover switch 5.
It is supplied to RAMs 6A and 6B as buffers via the side.

The output signal of the A/D converter 4 is supplied to a synchronization detection circuit 7, and the frame pulse signal and horizontal synchronization signal detected by this synchronization detection circuit 7 are supplied to a controller 8. The controller 8 has a frequency of 48kHz x 4 = 192kHz from the DAT50 in order to synchronize with the DAT50.
A system clock CLK is supplied.

Writing and reading to and from the RAMs 6A and 6B are controlled by the controller 8.
6B, when one is in the write state, the other is in the read state. In other words, M in RAM6A or 6B.
When data for 4 fields of the USE signal is written as still image data, RAM 6B or 6A is written respectively.
to DAT50 data recording speed (1,536,000
Four fields of data are read out in synchronization with the data rate (bits/second). In this case, data for 4 fields (8, 6
40,000 bits) is read out with a time of td (5.625 seconds).

Here, while data for four fields is read from one RAM at a recording speed of DAT50, many field signals are supplied as write signals to the other RAM, and the data contents are sequentially updated. Four fields of data are always stored.

After reading out four fields of data from one of the RAMs is completed, the writing and reading states of the RAMs 6A and 6B are switched. At this time, data for four fields immediately before switching is stored in the other RAM.

Still image data read from the RAMs 6A and 6B is supplied to the a side of the changeover switch 10 via the a side and b side of the changeover switch 9, respectively. Switching of the changeover switches 5 and 9 is controlled by a controller 8. The selector switch 5 is set to a when the RAM 6A is in the write state.
When connected to the side and RAM6B is in the write state b
connected to the side. The changeover switch 9 is connected to the a side when the RAM 6A is in the read state, and is connected to the b side when the RAM 6B is in the read state.

Reference numeral 33 denotes a dummy data generating circuit, and the output signal of this generating circuit 33 is supplied to the b-side fixed terminal of the changeover switch 10. The operation of this generating circuit 33 and the switching of the changeover switch 10 are controlled by the controller 8.

That is, immediately before four fields of data are supplied to the a side of the changeover switch 10, the generation circuit 33 generates a time tv (1/15 second) corresponding to four fields of data at the video system rate. dummy data DD is output. As the dummy data DD, for example, 128 level continuous data, 0 level and 255 level alternating continuous data, etc. are selected. Although not mentioned above, RAM6A, 6B
The reading of four fields worth of data from the dummy data DD will be started after the output of this dummy data DD. Also,
The changeover switch 10 is connected to the a side when data for four fields is supplied to the a side, and is connected to the b side when dummy data DD is supplied to the b side.

Therefore, the changeover switch 10 outputs data with dummy data DD added for the time tv to the beginning of each of the four fields of data (as shown in FIG. 3A), and this is supplied to the DAT 50 and recorded. .

Next, FIG. 1 shows the configuration of the reproduction system. In the figure, four fields of data (still image data) sequentially reproduced from the DAT 50 are transferred to the RAM 22 as a buffer via the a side and b side of the changeover switch 21.
A and 22B are alternately supplied and written.

The reproduction signal of the DAT 50 is transmitted to the synchronization detection circuit 23.
supplied to This synchronization detection circuit 23 detects dummy data DD added to the beginning of four fields of data, and supplies the detection signal SD to the controller 24. The end timing of this dummy data DD is 4
This is the start timing of the data for the field. Also,
This controller 24 has 192kHz from DAT50.
A system clock CLK is supplied.

Writing and reading of RAMs 22A and 22B are controlled by controller 24 based on detection signal SD and system clock CLK. Changeover switch 2
1 is controlled by the controller 24, and R
When the AM 22A is in the write state, it is connected to the a side, and when the RAM 22B is in the write state, it is connected to the b side.

When one of the RAMs 22A and 22B is in a write state, the other is in a read state. In the normal playback state, when data for four fields of the MUSE signal is written to RAM 22A or 22B, 16.2 MHz is output from RAM 22B or 22A, respectively.
Four fields of data are repeatedly read out in synchronization with the clock. After 4 fields of data have been written to one RAM, the roles of RAMs 22A and 22B are switched when reading from the other RAM reaches the end of the 4 fields of data. Ru.

When the reproduction signal from the DAT 50 is as shown in FIG. 3A, writing to the RAMs 22A and 22B,
The read state is as shown in B and C in the figure. For example, when still image data b is written in the RAM 22B, still image data a is repeatedly read out from the RAM 22A at a cycle of tv. After time T1 when writing of still image data b to RAM 22B ends, at time T2 when reading from RAM 22A reaches the end of still image data a, R
The roles of AM22A and AM22B are switched.

[0031] Then, the still image data b is repeatedly read out from the RAM 22B at the cycle of tv. Also, R
Still image data c is written into AM22A from time point T3 when the dummy data DD of the reproduced signal ends. In this case, the time difference between time T1 and T2 is always smaller than tv, and the reproduced signal at time T2 is always dummy data DD.
becomes.

FIG. 4 is a flowchart showing the operation in the normal playback state. That is, in step 101, it is determined whether writing of data for one screen into one RAM is completed. When this writing is completed, in step 102,
It is determined whether reading of data for one screen from the other RAM has been completed. When this reading is completed, in step 103, the writing and reading states of the RAMs 22A and 22B are switched. At this time, the changeover switches 21 and 25 are also changed over at the same time. Then, the process returns to step 101 and the same operations as described above are repeated.

A pause setting switch 39 is also connected to the controller 24 . When the setting switch 39 is turned on in the normal playback state, it becomes a pause state, and when the setting switch 39 is turned on again in this pause state, the normal playback state is returned.

The operation when setting a pose will be explained using the flow shown in FIG. 5A. When the setting switch 39 is turned on in the normal playback state (pause on), in step 111,
It is determined whether writing of data for one screen has been completed. When this writing is completed, in step 112, R
Writing and reading states of AM22A and AM22B are not switched, and writing is prohibited.

Then, in step 113, the controller 24 issues a stop command to the DAT 50, and further, in step 114, the controller 24 issues a rewind command to the DAT 50.

[0036] Then, in step 115, the predetermined time Ta
It is determined whether or not the period has elapsed. This time Ta is a sufficient time for the playback position to return to the data recording position before the recording position of the dummy data DD, for example, tv (time equivalent to data for one screen at a video system rate).

When the time Ta has elapsed, the controller 24 issues a stop command to the DAT 50 in step 116, and the DAT 50 enters a pause state in step 117.

Next, the operation when releasing the pause will be explained using the flow shown in FIG. 5B. Set switch 3 in pause state
When 9 is turned on (pause off), step 121
Then, the DAT 50 is released from the pause state and returns to the playback state.

Then, in step 122, it is determined whether the synchronization detection circuit 23 has detected the dummy data DD. When the dummy data DD is detected, it is determined in step 123 whether reading of data for one screen has been completed. When the reading is finished, in step 124, the RA
The write and read states of M22A and M22B are switched, and the write inhibited state is released.

[0040] Then, in step 125, the operation shifts to the normal playback state (see the flowchart in FIG. 4).

FIG. 6 shows the RAM 22 when setting and canceling the pose.
The states of A and 22B are shown. The recording pattern on the magnetic tape in DAT50 is as shown in FIG. 6A,
When the setting switch 39 is turned on while the tape position P1 is being reproduced, the writing and reading states of the RAMs 22A and 22B become as shown in FIGS. B and C in the figure.

That is, at tape position P1, RAM2
Still image data b is written to 2B, and RAM22
Still image data a is repeatedly read from A. When the writing of the still image data b to the RAM 22B is completed, the controller 24 issues a stop command to the DAT 50, and tape running is stopped at the tape position P2. Then, the controller 24 issues a rewind command to the DAT 50, and the magnetic tape is rewinded. Then, when a predetermined time Ta has elapsed, the controller 24 sends the DAT
A stop command is issued to DAT 50, tape running is stopped at tape position P3, and DAT 50 enters a pause state.

When the writing of the still image data b to the RAM 22B is completed, the writing and reading states of the RAMs 22A and 22B are not switched, and writing is prohibited. Therefore, the still image data b is held in the RAM 22B, and the still image data a is repeatedly read out from the RAM 22A.

Next, when the tape is in the pause state at the tape position P3 and the setting switch 39 is turned on, the R
The writing and reading states of AM22A and 22B are as shown in D and E of the figure.

That is, when the DAT 50 is released from the pause state and enters the playback state, the still image data a is repeatedly read out from the RAM 22A. After the dummy data DD is detected by the synchronization detection circuit 23 from the reproduced data,
Furthermore, when the still image data a is read to the end from the RAM 22A, the writing and reading states of the RAMs 22A and 22B are switched, and the write prohibition is canceled. Then, the still image data b is repeatedly read from the RAM 22B, and the still image data c is written to the RAM 22A. The subsequent write and read states of the RAMs 22A and 22B are similar to the normal playback state.

Note that in FIG. 6, TT indicates the running state of the tape in the DAT 50.

Returning to FIG. 1, four fields of data (still image data) according to the MUSE signal format repeatedly output from the RAMs 22A and 22B are sent to the MUSE decoder via the a side and b side of the changeover switch 25. 28
supplied to Switching of the changeover switch 25 is controlled by the controller 24, and when the RAM 22A is in the read state, it is connected to the a side, and when the RAM 22B is in the read state, it is connected to the b side.

The video signals (for example, R, G, B signals) output from the MUSE decoder 28 are supplied to a monitor television 29, and a still image is displayed on the monitor television 29.

In this example, when the setting switch 39 is turned on in the normal playback state (during pause setting), the DA
Still image data being played back from T50 is stored in RAM22A, 22
The playback state of the DAT 50 continues until the end is written to B, and then the DAT 50 enters a pause state. When the setting switch 39 is turned on in the pause state (when the pause is released), the still image data is stored in the RAMs 22A and 22B.
It is read out repeatedly. Therefore, a still image based on the still image data being reproduced at the time the pause is set can be displayed on the monitor television 29 after the pause is released. Thereby, even if the setting switch 39 is turned on during playback to set a pause, the entire recorded screen can be played back as a still image.

Furthermore, when the setting switch 39 is turned on in the normal playback state to enter the pause state, the RAM 22A, 22
Since the same still image data as at the time of the ON operation is repeatedly read out from B, the same still image as at the time of the ON operation is continuously displayed on the monitor television 29. Then, when the setting switch 39 is turned on in the pause state to cancel the pause state, the still image data stored before entering the pause state is repeatedly read out from the RAMs 22A and 22B, and the next image is displayed on the monitor television 29. Display starts from a still image. This makes it possible to reproduce still images with good connections.

Furthermore, dummy data D is inserted for the time of tv between the still image data (data for 4 fields) of each screen.
D is inserted and recorded, and during playback, after writing of still image data to one RAM is completed, when reading from the other RAM reaches the end of one screen worth of still image data, RAM22A, 22B The role of can be switched. Therefore, the roles of the RAMs 22A and 22B are not switched during reading of still image data for one screen from the other RAM, and it is possible to avoid double still images at the moment of switching.

[0052] In the above-mentioned embodiment, when setting the pause, the DAT is
The tape running of DAT50 is stopped and rewound for a predetermined time Ta, but it is configured to detect whether or not the beginning of the dummy data DD has passed, and to stop the tape running of DAT50 when it has passed. Good too.

In this case, as shown in FIG.
14, the controller 24 issues a rewind command to the DAT 50, and then, in step 115', the dummy data DD
It is determined whether or not the first one has passed. When the first dummy data DD passes, the process proceeds to step 116, where a stop command is issued to the DAT 50. The other steps are the same as shown in FIG. 5A, and corresponding steps are shown with the same reference numerals.

By using the detection output of the dummy data DD during rewinding in this way, the amount of rewinding can be reduced, and the time required to play the next still image when canceling a pause can be shortened. . The tape running state TT during rewinding is as shown by the broken line in FIG. 6, and the stop position P3' in the pause state is close to the dummy data DD.

Furthermore, in the above-mentioned embodiment, in the pause state, the still images at the time when the setting switch 39 was turned on are continuously displayed, but the next still images are continuously displayed. It is also possible to do so.

The operation when setting a pose will be explained using the flow shown in FIG. 8A. When the setting switch 39 is turned on in the normal playback state (pause on), in step 131,
It is determined whether writing of data for one screen has been completed. When this writing is completed, in step 132, R
The writing and reading states of AM22A and 22B are switched, and writing is prohibited.

Then, in step 133, the controller 24 issues a stop command to the DAT 50, and further, in step 134, the controller 24 issues a rewind command to the DAT 50.

Then, in step 135, the predetermined time Ta
It is determined whether or not the period has elapsed. When the time Ta has elapsed, in step 136, the controller 24 sends the DAT5
A stop command is issued to DAT 50 at step 137.
It is considered to be in a pause state.

Next, the operation when releasing the pause will be explained using the flow shown in FIG. 8B. Set switch 3 in pause state
When 9 is turned on (pause off), step 141
Then, the DAT 50 is released from the pause state and returns to the playback state.

Then, in step 142, it is determined whether the synchronization detection circuit 23 has detected the dummy data DD. When the dummy data DD is detected, it is determined in step 143 whether reading of data for one screen has been completed. When the reading is finished, in step 144, the RA
The write and read states of M22A and M22B are not switched, and the write inhibited state is released.

[0061] Then, in step 145, the operation shifts to the normal playback state (see the flowchart in FIG. 4).

Note that in step 132, it is not necessarily necessary to prohibit writing. There is no problem since the written data is not used when canceling the pause. In that case, there is no need to release write protection in step 144.

FIG. 9 shows the RAM 22 when setting and canceling the pose.
The states of A and 22B are shown. The recording pattern on the magnetic tape in DAT50 is as shown in FIG. 9A,
When the setting switch 39 is turned on while the tape position P1 is being reproduced, the writing and reading states of the RAMs 22A and 22B become as shown in FIGS. B and C in the figure.

That is, at tape position P1, RAM2
Still image data b is written to 2B, and RAM22
Still image data a is repeatedly read from A. When the writing of the still image data b to the RAM 22B is completed, the controller 24 issues a stop command to the DAT 50, and tape running is stopped at the tape position P2. Then, the controller 24 issues a rewind command to the DAT 50, and the magnetic tape is rewinded. Then, when a predetermined time Ta has elapsed, the controller 24 sends the DAT
A stop command is issued to DAT 50, tape running is stopped at tape position P3, and DAT 50 enters a pause state.

When the writing of the still image data b to the RAM 22B is completed, the writing and reading states of the RAMs 22A and 22B are switched, and writing is prohibited. Therefore, the still image data b is repeatedly read out from the RAM 22B.

Next, when the tape is in the pause state at the tape position P3 and the setting switch 39 is turned on, the R
The writing and reading states of AM22A and 22B are as shown in D and E of the figure.

That is, when the DAT 50 is released from the pause state and enters the playback state, the still image data b is repeatedly read out from the RAM 22B. After the dummy data DD is detected by the synchronization detection circuit 23 from the reproduced data,
Furthermore, when the still image data b is read out from the RAM 22B to the end, the writing and reading states of the RAMs 22A and 22B are not switched, and the write prohibition is canceled. The still image data b is then repeatedly read out from the RAM 22B, and the still image data c is written into the RAM 22A. The subsequent write and read states of the RAMs 22A and 22B are similar to the normal playback state.

In the example shown in FIG. 8, after writing data for one screen during pause setting, DAT50
The tape running of the DAT 50 is stopped and the tape is rewound for a predetermined time Ta, but it is also possible to detect whether or not the beginning of the dummy data DD has passed and stop the tape running of the DAT 50 when it has passed. good.

In this case, as shown in FIG. 10, after the controller 24 issues a rewind command to the DAT 50 in step 134, the dummy data D is
It is determined whether the first part of D has passed. When the first dummy data DD passes, the process advances to step 136, where a stop command is issued to the DAT 50. The other steps are the same as those shown in FIG. 8A, and corresponding steps are shown with the same reference numerals.

[0070] By using the detection output of the dummy data DD during rewinding in this way, the amount of rewinding can be reduced, and the time until the next still image is played back when the pause is released can be shortened. . The tape running state TT during rewinding is as shown by the broken line in FIG. 9, and the stop position P3' in the pause state is close to the dummy data DD.

Furthermore, in the above-mentioned embodiment, when the setting switch 39 is turned on, the DAT 50 is put into the playback state until the still image data being played back is written into the RAMs 22A and 22B, and then put into the pause state. ,
A pause state may be created without writing the still image data being played back.

[0072] The operation at the time of pose setting will be explained using the flow shown in FIG. 11A. Setting switch 39 in normal playback state
When is turned on (pause on), in step 151, writing and reading states of the RAMs 22A and 22B are not switched, and writing is prohibited.

Then, in step 152, the controller 24 issues a stop command to the DAT 50, and further, in step 153, the controller 24 issues a rewind command to the DAT 50.

[0074] Then, in step 154, the predetermined time Tb
It is determined whether or not the period has elapsed. This time Tb is sufficient time for the reproduction position to pass through the recording position of the dummy data DD and return to the previous data recording position, for example, td (DAT
(time equivalent to one screen worth of data at the system rate).

When time Tb has elapsed, the controller 24 issues a stop command to the DAT 50 in step 155, and the DAT 50 is placed in a pause state in step 156.

Next, the operation when releasing the pause will be explained using the flow shown in FIG. 11B. When the setting switch 39 is turned on in the pause state (pause off), step 16
1, the pause state of the DAT 50 is released and returns to the playback state.

Then, in step 162, it is determined whether the synchronization detection circuit 23 has detected the dummy data DD. When the dummy data DD is detected, it is determined in step 163 whether reading of data for one screen has been completed. When the reading is finished, in step 164, the RA
The write and read states of M22A and M22B are not switched, and the write inhibited state is released.

[0078] Then, in step 165, the operation shifts to the normal playback state (see the flowchart in FIG. 4).

Note that it is not necessarily necessary to prohibit writing in step 151. Since the written data is not used when canceling the pause, there is no problem. In that case, there is no need to release write protection in step 164.

FIG. 12 shows the RAM 2 when setting and canceling the pose.
2A and 22B are shown. The recording pattern on the magnetic tape in the DAT50 is as shown in FIG. 12A, and when the setting switch 39 is turned on while playing the tape position P1, the write and read states of the RAMs 22A and 22B are as shown in B and C in the same figure. It comes to show.

That is, at tape position P1, RAM2
Still image data b is written to 2B, and RAM22
Still image data a is being repeatedly read out from A, but the controller 24 immediately issues a stop command to the DAT 50 to stop tape running. Then, the controller 24 issues a rewind command to the DAT 50, and the magnetic tape is rewinded. Then, after a predetermined time Tb has elapsed, the controller 24 issues a stop command to the DAT 50, tape running is stopped at tape position P3, and the DAT 50 enters a pause state.

[0082] Writing and reading states of the RAMs 22A and 22B are not switched, and writing is prohibited. Therefore, the still image data a is repeatedly read from the RAM 22A, and writing of the still image data b to the RAM 22B is stopped midway.

Next, when the tape is in the pause state at the tape position P3 and the setting switch 39 is turned on, the R
The writing and reading states of AM22A and 22B are as shown in D and E of the figure.

That is, when the DAT 50 is released from the pause state and enters the playback state, the still image data a is repeatedly read out from the RAM 22A. After the dummy data DD is detected by the synchronization detection circuit 23 from the reproduced data,
Further, when the still image data a is read to the end from the RAM 22A, the writing and reading states of the RAMs 22A and 22B are not switched, and the write prohibition is canceled. Still image data a is then repeatedly read out from the RAM 22A, and still image data b is written into the RAM 22B. The subsequent write and read states of the RAMs 22A and 22B are similar to the normal playback state.

When the pause setting and release operations are performed as shown in FIG. 11, setting switch 3 is pressed in the normal playback state.
9 is turned on (when setting a pause), the pause state is entered after rewinding to the recording position of the still image data previous to the still image data being reproduced. Then, when the setting switch 39 is turned on in the pause state (when the pause is released)
, the still image data being played above is played back again and stored in the RAM.
It is written to 22A and 22B and read out repeatedly. Therefore, a still image based on the still image data being reproduced at the time the pause is set can be displayed on the monitor television 29 after the pause is released. Thereby, even if the setting switch 39 is turned on during playback to set a pause, the entire recorded screen can be played back as a still image.

Furthermore, if the setting switch 39 is turned on in the normal playback state to enter the pause state, the RAM 22A, 22
Since the same still image data as at the time of the ON operation is repeatedly read out from B, the same still image as at the time of the ON operation is continuously displayed on the monitor television 29. Then, when the setting switch 39 is turned on in the paused state to cancel the paused state, the next still image data to be played will be R.
After being stored in the AMs 22A and 22B, it is repeatedly read out, and display on the monitor television 29 starts from the next still image. This makes it possible to reproduce still images with good connections.

In the example shown in FIG. 11, the tape is rewound for a predetermined time Tb to enter a pause state, but it is detected whether or not the beginning of the dummy data DD has passed, and when the beginning of the dummy data DD has passed, the tape of DAT50 is The vehicle may stop running.

In this case, as shown in FIG. 13, after the controller 24 issues a rewind command to the DAT 50 in step 153, the dummy data D is
It is determined whether the first part of D has passed. When the first dummy data DD has passed, the process advances to step 155 and a stop command is issued to the DAT 50. The other steps are the same as those shown in FIG. 11A, and corresponding steps are shown with the same reference numerals.

[0089] By using the detection output of the dummy data DD during rewinding in this way, the amount of rewinding can be reduced, and the time until the next still image is played back when the pause is released can be shortened. . The tape running state TT during rewinding is as shown by the broken line in FIG. 12, and the stop position P3' in the pause state is close to the dummy data DD.

In the above-mentioned embodiment, the dummy data DD is inserted and recorded between the still image data of each screen for the time of tv, but as shown in FIG. The synchronization pattern signals PS1 and PS2 may be placed at the beginning and end of the DD, respectively. In this case, the synchronization detection circuit 23 of the reproduction system (shown in FIG. 1)
Then, the last synchronization pattern signal PS2 can be detected and used as the cue signal for the next still image data, and the first synchronization pattern signal PS1 can be detected and used as the dummy data D.
D can be the first detection signal.

Further, in the above embodiment, the time of the dummy data DD is tv, but it may be any time longer than tv. However, as this time becomes longer, the number of still images recorded on the recording medium (magnetic tape) decreases. For example, by inserting dummy data DD for the time of tv, the recording time of still image data for one screen is td(
5.625 seconds) + tv (0.0667 seconds), which is approximately 1
．． This is an increase of 2% (5.6917/5.625-1).

Furthermore, in the above embodiment, data for four fields is used as one unit of still image data, but it is also possible to use two fields or one field as one unit of still image data. Can be applied.

Furthermore, in the above embodiment, the MUSE signal is recorded and reproduced as still image data on the DAT50, but other television signals, such as NTSC television signals, may be recorded as still image data. The same can be applied to the case of reproduction.

For example, a video signal of frame still images (30 frames per second, 33.3 msec per frame) is processed at 4 fsc.
Consider the case where sampling is performed at =14.3 MHz (fsc is the color subcarrier frequency) and recording and reproduction is performed using a DAT50. Still image data for one screen is 14.3MHz x 33.3
Since m seconds x 8 bits = 3,809,520 bits, one screen worth of still image data is approximately 2.0 m seconds with DAT50.
Recording and playback takes 48 seconds. In this case, when recording,
Dummy data DD of 33.3 msec is inserted between the still image data of each screen and recorded. Thereby, it is possible to prevent two still images from being doubled during playback, as in the above-described embodiment.

Furthermore, in the above embodiment, two RA
Although M22A and 22B (6A, 6B) are used, it is also possible to use one or three or more.

[0096]

Effects of the Invention According to the first invention, when a pause is set, the data on the screen being played back becomes a pause state after being played back, so the data on the screen being played back becomes an error before entering the pause state. This can be achieved without deteriorating the rate, and even if a pause command is issued during playback, the entire recorded screen can be played back satisfactorily.

According to the second invention, when a pause is set, the pause state is entered after returning to the playback position of the screen before the screen being played back, so the data on the screen being played back is processed to reduce the error rate. This can be obtained after canceling the pause without causing a pause, and even if a pause command is issued during playback, the entire recorded screen can be successfully played back.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a reproduction system according to an embodiment.

FIG. 2 is a block diagram showing the configuration of a recording system according to an embodiment.

FIG. 3 is a diagram for explaining data processing during recording and reproduction.

FIG. 4 is a flowchart showing operations in a normal playback state.

FIG. 5 is a flowchart showing an example of an operation when setting and canceling a pause.

FIG. 6 is a diagram for explaining an example of a memory state when setting and canceling a pause.

FIG. 7 is a flowchart showing another example of operation when setting a pause.

FIG. 8 is a flowchart showing another example of operations when setting and canceling a pause.

FIG. 9 is a diagram for explaining another example of a memory state when setting and canceling a pause.

FIG. 10 is a flowchart showing another example of operation when setting a pause.

FIG. 11 is a flowchart showing another example of operations when setting and canceling a pause.

FIG. 12 is a diagram for explaining another example of a memory state when setting and canceling a pause.

FIG. 13 is a flowchart showing another example of operation when setting a pause.

FIG. 14 is a diagram showing the structure of an example of dummy data.

FIG. 15 is a diagram showing the format of a MUSE signal.

[Explanation of symbols]

2 BS tuner 6A, 6B, 22A, 22B RAM 7, 23 Synchronization detection circuit 8, 24 Controller 28 MUSE decoder 29 Monitor TV 33 Dummy data generation circuit 39 Pause setting switch 50 DAT

Claims (2)

[Claims] Claim 1: A playback device that sequentially plays back data on a screen-by-screen basis, comprising a pause setting means, and when a pause is set by the pause setting means, the pause state is entered after the data of the screen being played is played back. A playback device made like this. 2. A playback device that sequentially plays back data on a screen-by-screen basis, further comprising pause setting means, and when the pause setting means sets a pause, the playback device returns to the playback position of the screen before the screen being played. A playback device that is in a pause state.