JP3602768B2 - Time shift reproduction method and apparatus - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a time-shift playback that enables playback of recorded main recorded data from an arbitrary position by playing back recorded data during the recording at the same time as video recording. The present invention relates to a time-shift reproduction method and apparatus in a control technique at the time of medium forward high-speed reproduction (FF reproduction) and a reproduction control technique when a recording unit and a reproduction unit are driven based on different synchronization signals.
[0002]
[Prior art]
Recently, a demand for a time shift reproduction function is increasing, and various control methods have been developed.
[0003]
The basic principle of the time shift reproduction is as follows. First, when video recording is started by a user's recording start operation, the recorded contents are generated as recorded data, and the recorded data is started to be stored in a storage device such as a hard disk, for example, as a file. Next, when the user instructs to play back the video being recorded while the video is being recorded, the playback unit starts playback based on the file recorded on the disc. By adopting such means, it becomes possible to reproduce and view the contents of the video for which recording has not yet been completed from an arbitrary position recorded on the disc. However, since the reproduction is performed based on the data being recorded, it is necessary to perform control in a case where reproduction is to be performed on a portion which has not yet been recorded and recorded on the disk. Conventionally, the following method has been used for the control.
[0004]
During FF playback in time-shift playback, as a control method when playback reaches the end of recorded data, a method of stopping playback from a file and directly outputting video data obtained by a recording unit as playback data. It has been known. In this case, the playback speed returns to the normal speed, but the playback from the file is stopped to prevent the playback from the file from catching up with the recording many times.
[0005]
Further, when different synchronization signals are used for the recording unit and the reproducing unit, if the reproducing side has a fast pace, the reproduction may catch up with the recording, and the reproducing unit may fail to acquire data. For this reason, conventionally, at the start of time-shift reproduction, reproduction from the time position close to the time length of the recorded video data is prohibited, so that even if there is some deviation in the pace of the synchronization signal, time-shift reproduction is performed. In other words, the recorded data had room enough to keep up with the playback.
[0006]
[Problems to be solved by the invention]
However, in the method of stopping the reproduction from the file when the reproduction reaches the end of the recorded data in the FF reproduction and directly reproducing and outputting the video data of the recording unit, the video data input to the recording unit is directly input to the reproduction unit. It was necessary to add a video overlay function or the like to the hardware in order to reproduce and output.
[0007]
Also, when different synchronization signals are used for the recording unit and the playback unit, it is necessary to secure a considerable margin in advance depending on the predicted degree of the shift of the synchronization signal and the maximum duration of time shift playback. What happened.
[0008]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a time-shift reproduction method for performing control when reproduction catches up with recording in a time-shift reproduction in the state of reproduction from a file in the FF reproduction. And an apparatus.
[0009]
The present invention has been made in order to solve the above-described problem, and in the case where the recording catches up with the recording when the recording unit and the reproducing unit in the time shift reproduction operate based on different synchronization signals. It is an object of the present invention to provide a time shift reproduction method and apparatus in which control is performed without increasing a margin between a recording position and a reproduction position.
[0010]
[Means for Solving the Problems]
The present invention includes a recording unit that converts a video being recorded into data, a storage unit that records the data converted by the recording unit, and a playback unit that reads the data from the storage unit and plays the data. After the start of the time-shift playback to play back the recorded data during the recording of data by the recording unit, monitoring whether or not the playback by the playback unit has ended, if it is determined that the playback has ended, The state of the recording unit is confirmed, and if the recording is completed, the time-shift reproduction is terminated as it is, and if the recording is continued, the time-shift reproduction is restarted .
[0011]
By the above means, it is possible to prevent the reproduction from reaching the end of the recorded data at that point.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a block diagram schematically showing a configuration of a time shift reproducing apparatus according to the first embodiment of the present invention.
[0018]
FIG. 1 shows that when the time-shift playback is started, the time length of the recorded data recorded at regular intervals is checked, and if the difference between the recorded length and the current playback position is less than the fixed time, playback pause is performed. It is assumed that the present invention is applied to a time-shift reproducing apparatus that resumes reproduction after a lapse of a predetermined time.
[0019]
The recording unit 103 acquires video data at the same time as a recording start instruction from the user operation unit 106, generates recorded data, and records it in the storage device 105. When the user instructs time-shift playback from the user operation unit 106, the playback unit 104 reads out the recorded data recorded in the storage device 105 and starts playback. Note that the user operation unit 106 is, for example, a remote control, or a group of operation switches on the front panel of the time shift reproducing apparatus. The time control unit 101 notifies the time shift reproduction control unit 102 of the arrival of time at fixed time intervals after the start of the time shift reproduction. Upon receiving the notification from the time control unit 101, the time shift reproduction control unit 102 analyzes the recorded data continuously recorded in the storage device 105, and calculates the current recording length. Next, the current playback position is obtained from the playback unit 104, and the difference from the recording length is obtained. If the difference is equal to or longer than a predetermined length, reproduction is continued as it is. If the difference is less than a certain value, the time shift reproduction control unit 102 controls the reproduction unit 104 to pause the reproduction. Thereafter, after a certain period of time, the reproduction unit 104 is controlled again to resume reproduction.
[0020]
FIG. 4 is a flowchart showing processing in the time shift reproduction device according to the first embodiment of the present invention.
[0021]
This will be described below with reference to the flowchart of FIG.
[0022]
Based on the user's recording start instruction, the recording unit 103 acquires video data and records the recorded data in the recording device 105 (step S101). Then, when the time shift reproduction is instructed from the user operation unit 106 including, for example, a remote controller, the reproduction unit 104 reads the recorded data recorded in the storage device 105 and starts reproduction (step S102). The time-shift playback control unit 102 checks whether a predetermined time has elapsed from the start of recording (the second and subsequent inspections have been performed after the previous inspection) based on the clock of the system (step S103). If the fixed time has not yet elapsed (N in step S103), the process is repeated until the fixed time has elapsed. If the fixed time has elapsed (Y in step S103), the process proceeds to step S104. The time-shift reproduction control unit 102 checks the recorded video data, calculates the recording length, and acquires the current reproduction position from the reproduction unit 104 (steps S104 and S105).
[0023]
Then, a difference between the recording length and the reproduction position is obtained, and if the difference is equal to or longer than the predetermined time length (Y in step S106), the process returns to step S103. If it is shorter than the predetermined time length (N in step S106), the reproduction unit 104 is controlled to pause the reproduction (step S107). The time-shift reproduction control unit 102 waits for a predetermined time to elapse based on the clock of the system, and after the time has arrived, controls the reproduction unit 104 to restart reproduction (steps S108 and S109).
[0024]
As described above, when the time-shift reproduction is started, the time-shift reproduction control unit periodically monitors the time length of the current file based on the time information included in the recorded video file. . The time length is compared with the current playback position, and if the difference is less than a certain value even though the recording is not completed, the playback is paused. Then, after a certain time has elapsed, the reproduction is restarted again. By performing such control, the reproduction is prevented from reaching the end of the recorded data at that time.
[0025]
As a second embodiment, when time-shift playback is started, the length of time recorded from the recording unit is acquired at regular intervals, and if the difference between the recording length and the current playback position is less than a fixed time, playback pause is performed. And a time-shifted playback device that resumes playback after a predetermined time has elapsed.
[0026]
FIG. 2 is a block diagram schematically showing a configuration of a time shift reproducing apparatus according to a second embodiment of the present invention.
[0027]
The recording unit 203 acquires video data simultaneously with the recording start instruction from the user operation unit 206, generates recorded data, and records the generated data in the storage device 205. When the time shift reproduction is instructed from the user operation unit 206, the reproduction unit 204 reads the recorded data recorded in the storage device 205 and starts reproduction. The time control unit 201 notifies the time shift reproduction control unit 202 of the arrival of time at fixed time intervals after the start of the time shift reproduction. Upon receiving the notification from the time control unit 201, the time shift reproduction control unit 202 acquires the current recording length from the recording unit 203. Next, the current playback position is obtained from the playback unit 204, and the difference from the recording length is obtained. If the difference is equal to or longer than a predetermined length, reproduction is continued as it is. If the difference is less than a certain value, the reproduction unit 204 is controlled to pause the reproduction. Thereafter, after a certain period of time, the reproduction unit 204 is controlled again to resume reproduction. When restarting after a certain time has elapsed, the pause time may be counted based on the synchronization signal of the playback unit 204, or the pause between the recording length acquired from the recording unit 203 and the current playback position may be counted. It may be calculated from the difference.
[0028]
As described above, the time shift reproduction control unit 202 obtains the recording length of the recording data recorded in the storage device 205 from the recording unit 203, so that the reproduction ends at the current end of the recording data. Can be prevented.
[0029]
FIG. 3 is a block diagram schematically showing a configuration of a time shift reproducing apparatus according to a third embodiment of the present invention.
[0030]
FIG. 3 shows that, after the start of the time-shift playback, when the playback end is notified from the playback unit, information on whether or not the recording is continuing is acquired from the recording unit. In the case where the reproduction is ended and the reproduction is continued, the present invention is applied to a time-shift reproduction device that restarts the reproduction from the time position where the reproduction is completed after a lapse of a predetermined time.
[0031]
The recording unit 302 acquires video data simultaneously with a recording start instruction from the user operation unit 305, generates recorded data, and records the generated data in the storage device 304. When the time shift reproduction is instructed from the user operation unit 305, the reproduction unit 303 reads out the recorded data continuously recorded in the storage device 304 and starts reproduction. The reproduction unit 303 cannot continuously read data from the storage device 304, and notifies the time-shift reproduction control unit 301 of the end of reproduction when the reproduction up to that point is completed. Upon receiving the notification from the playback unit 303, the time shift playback control unit 301 acquires the current recording status from the recording unit 302. If the recording has already been completed, the time-shift reproduction is terminated as it is. If the recording has been continued, the reproduction unit 303 is controlled after a predetermined time has elapsed, and the time at which the reproduction has ended is determined. Resume playback from the position.
[0032]
FIG. 5 is a flowchart showing processing in the time shift reproduction device according to the third embodiment of the present invention.
[0033]
This will be described below with reference to the flowchart of FIG.
[0034]
Based on a user's recording start instruction, the recording unit 302 acquires video data and records the recorded data in the recording device 304 (step S201). Then, when the time shift reproduction is instructed from the user operation unit 305 such as a remote controller, the reproduction unit 303 reads out the recorded data recorded in the storage device 304 and starts reproduction (step S202). The time shift reproduction control unit 301 monitors the notification of the reproduction end from the reproduction unit 303, and if not notified (N of step S203), repeats step S203. If the notification has been received (Y in step S203), the recording state is acquired from the recording unit 302, and it is determined from the information on the recording state whether the recording is completed or continued (steps S204 and S205). Then, when the information that the processing has been completed is obtained (Y in step S205), the time shift reproduction is completed as it is (step S208). If the information indicating that the reproduction is continued (N in step S205) is obtained, the reproduction unit 303 is controlled from the time position where reproduction is completed by controlling the reproduction unit 303 after a certain period of time has elapsed and after the time has arrived. Is restarted (steps S206 and S207). Then, the process returns to step S203.
[0035]
It should be noted that, not only whether the information obtained from the recording unit is being recorded, but also the recording length when the recording is completed, and the recording end position is set even if the recording is completed. If the length has not been reached, the reproduction may be resumed.
[0036]
By performing such control, the time-shifted reproduction can be continued even when the reproduction reaches the end of the recorded data at that time.
[0037]
【The invention's effect】
As described above, according to the present invention, in FF playback during time-shift playback, control when playback catches up with recording can be performed in the state of playback from a file.
[0038]
In addition, when the recording unit and the reproducing unit in the time shift reproduction are operating based on different synchronization signals, the control when the reproduction catches up with the recording can be performed without increasing the margin between the recording and the reproduction position. It can be carried out.
[Brief description of the drawings]
FIG. 1 is a block diagram schematically showing a configuration of a time shift reproduction device according to a first embodiment of the present invention.
FIG. 2 is a block diagram schematically showing a configuration of a time shift reproducing device according to a second embodiment of the present invention.
FIG. 3 is a block diagram schematically showing a configuration of a time shift reproducing apparatus according to a third embodiment of the present invention.
FIG. 4 is a flowchart illustrating a process in the time shift reproduction device according to the first embodiment of the present invention.
FIG. 5 is a flowchart showing a process in a time shift reproduction device according to a third embodiment of the present invention.
[Explanation of symbols]
101, 201 Time control unit 102, 202, 301 Time shift reproduction control unit 103, 203, 302 Recording unit 104, 204, 303 Reproduction unit 105, 205, 304 Storage device 106, 206, 305 User operation unit

Claims (4)

A recording unit that converts the video being recorded into data, a storage unit that records the data converted by the recording unit, and a playback unit that reads and plays back the data from the storage unit,
After the start of the time-shift playback for playing back the recorded data during the recording of the data by the recording unit, it is monitored whether or not the playback by the playback unit has ended, and when it is determined that the playback has ended, the Checking the state of the recording unit, ending the time-shift reproduction if the recording is completed, and resuming the time-shift reproduction if the recording is continued, wherein the time-shift reproduction is performed. . Recording means for converting the video being recorded into data,
Storage means for recording the data converted by the recording means,
Reproducing means for reading the data from the storage means and reproducing the data;
When time-shift reproduction for reproducing the recorded data is started during recording of the data by the recording means, monitoring whether or not the reproduction by the reproduction means has been completed, and determining that the reproduction has been completed. Time-shift playback for confirming the information of the recording state by the recording means, and ending the time-shift playback if the recording is completed, and restarting the time-shift playback if the recording is continued. Control means;
A time shift reproducing apparatus comprising: 3. The time-shift playback device according to claim 2, wherein the time-shift playback control unit confirms information on a recording state of the recording unit, and restarts the time-shift playback after a predetermined time has elapsed if the recording is continued. A time-shift reproducing apparatus characterized by the above-mentioned. 3. The time-shift playback device according to claim 2, wherein the time-shift playback control unit confirms information on a recording state of the recording unit, and when the recording is continued, after a predetermined time elapses, a time when the reproduction ends. A time-shift reproduction device for restarting time-shift reproduction from a position.

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