JP3917611B2 - Time shift reproduction method and apparatus - Google Patents

Description

  The present invention relates to time-shift playback that enables playback of recorded main recording data from an arbitrary position by playing back the recorded data being recorded simultaneously with video recording, and in particular, time-shift playback. The present invention relates to a time shift reproduction method and apparatus in a control technique at the time of 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.

  Recently, there is an increasing demand for a time shift reproduction function, and various control methods have been developed.

  The basic principle of time shift playback is as follows. First, when video recording is started by a recording start operation from a user, the recording content is generated as recording data, and the recording data starts to be stored in a storage device such as a hard disk as a file, for example. Next, when the user is instructed to play back the video being recorded during the video recording, the playback unit starts playback based on the file recorded on the disc. By taking such means, it becomes possible to play back and view the content of the video that has not yet been recorded from any position recorded on the disc. However, since playback is performed based on the data being recorded, it is necessary to perform control when attempting to play back a portion that has not yet been recorded and recorded on the disc. Conventionally, the following method has been adopted as the control.

  As a control method when playback reaches the end of recorded data during FF playback in time-shift playback, a method of stopping playback from a file and outputting video data acquired by the recording unit directly as playback data It has been known. In this case, the playback speed returns to the normal speed here, but by stopping the playback from the file, the playback from the file has avoided catching up with the recording many times.

  Also, when different sync signals are used in the recording unit and the playback unit, if the playback side is fast, playback may catch up with the recording, and the playback unit may fail to acquire data. Therefore, in the past, when time-shift playback is started, playback from a time position close to the time length of recorded video data is prohibited, so even if there is a gap in the sync signal pace, In other words, the recording data was given enough room for playback to catch up.

  However, in the method of stopping reproduction from a file and reproducing and outputting the video data of the recording unit directly when the reproduction reaches the end of the recorded data in FF reproduction, the video data input to the recording unit is directly input to the reproduction unit. However, it was necessary to add a video overlay function or the like to the hardware for playback and output.

  In addition, when different sync signals are used in the recording unit and the playback unit, it is necessary to secure a considerable margin in advance according to the degree of deviation of the predicted sync signal pace and the maximum duration of time shift playback. It happened.

  The present invention has been made to solve the above problems, and performs a time-shift playback apparatus that performs control when playback catches up with recording in FF playback during time-shift playback while keeping playback from a file. The purpose is to provide.

  The present invention has been made in order to solve the above-described problems. When the recording unit and the reproducing unit in time-shifted reproduction are operated based on different synchronization signals, the reproduction is caught up with the recording. It is an object of the present invention to provide a time-shift playback device that performs control without increasing a margin between recording and playback positions.

In an example of the present invention, in order to achieve the above object, a recording unit that converts video being recorded into data, a storage unit that records data converted by the recording unit, and reads the data from the storage unit And a time shift reproduction control unit for reproducing the recorded data during recording of the data by the recording unit, the time length of the data being converted and recorded by the recording unit, and the time shift The time difference between the time length and the playback position is calculated from the playback position during the time-shift playback of the data being converted and recorded by the playback controller , and if the time difference is greater than or equal to a predetermined length, playback is continued If the time difference is less than said predetermined length, the playback pause state, after from the pause state for a predetermined time elapses, that was so that to start the time shift reproduction to the reproduction unit And butterflies.

  By the above means, even when the reproduction reaches the end of the recorded data at that time, the time-shifted reproduction is continued and the recorded data can be time-shifted reproduced to the end.

Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram schematically showing the configuration of the time shift playback device according to the first embodiment of the present invention.

  Figure 1 shows that when time-shifted playback is started, the time length of recorded data recorded at regular intervals is inspected, and if the difference between the recorded length and the current playback position is less than a certain time, playback pause is performed. It is assumed that the present invention is applied to a time shift reproduction device that resumes reproduction again after a predetermined time has elapsed.

  The recording unit 103 acquires video data simultaneously with the recording start instruction from the user operation unit 106, generates recording data, and records it in the storage device 105. When time shift playback is instructed from the user operation unit 106 by the user, the playback unit 104 reads the recorded data continuously 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 playback device. The time control unit 101 notifies the time shift reproduction control unit 102 of the arrival of time at regular intervals after the start of time shift reproduction. When receiving the notification from the time control unit 101, the time shift reproduction control unit 102 analyzes the recording data continuously recorded in the storage device 105 and calculates the current recording length. Next, the current playback position is acquired from the playback unit 104, and the difference from the recording length is obtained. If the difference is greater than or equal to a predetermined length, playback is continued as it is. If the difference is less than a certain value, the time shift playback control unit 102 controls the playback unit 104 to pause playback. Thereafter, after a predetermined time has elapsed, the playback unit 104 is controlled again to resume playback.

  FIG. 4 is a flowchart showing processing in the time shift reproducing device according to the first embodiment of the present invention.

  This will be described below with reference to the flowchart of FIG.

  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 time shift playback is instructed from the user operation unit 106 such as a remote controller, the playback unit 104 reads the recorded data recorded in the storage device 105 and starts playback (step S102). Based on the clock of the system, the time shift reproduction control unit 102 checks whether a predetermined time has elapsed since the start of recording (after the previous inspection for the second and subsequent inspections) (step S103). If the predetermined time has not yet elapsed (N in step S103), the process is repeated until the predetermined time has elapsed (Y in step S103), and the process proceeds to step S104. The time shift playback control unit 102 examines the recorded video data, calculates the recording length, and obtains the current playback position from the playback unit 104 (steps S104 and S105).

  Then, the difference between the recording length and the reproduction position is obtained. 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 less than the predetermined time length (N in Step S106), the playback unit 104 is controlled to cause playback to be paused (Step S107). The time shift playback control unit 102 waits for a predetermined time based on the clock of the system, and controls the playback unit 104 to resume playback after the time has come (steps S108 and S109).

  As described above, when time-shift playback is started, the time-shift playback control unit periodically monitors the time length of the current file based on the time information included in the recorded recording file. . The time length is compared with the current reproduction position, and the reproduction is paused when the difference becomes less than a certain value even though the recording is not finished. Then, the reproduction is resumed again after a certain time has elapsed. By performing such control, reproduction is prevented from reaching the current end of the recorded data.

  As a second embodiment, when time-shifted playback is started, the recorded time length is acquired from the recording unit at regular intervals, and if the difference between the recorded length and the current playback position is less than the predetermined time, the playback pause is performed. It is assumed that the present invention is applied to a time-shift playback device that restarts playback after a predetermined time has elapsed.

  FIG. 2 is a block diagram schematically showing the configuration of the time shift reproduction device according to the second embodiment of the present invention.

  The recording unit 203 acquires video data simultaneously with the recording start instruction from the user operation unit 206, generates recording data, and records it in the storage device 205. When the time shift reproduction is instructed from the user operation unit 206, the reproduction unit 204 reads out the recorded data continuously 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 regular intervals after the start of time shift reproduction. When receiving the notification from the time control unit 201, the time shift playback control unit 202 acquires the current recording length from the recording unit 203. Next, the current playback position is acquired from the playback unit 204, and the difference from the recording length is obtained. If the difference is greater than or equal to a predetermined length, playback is continued as it is. If the difference is less than a certain level, the playback unit 204 is controlled to pause playback. Thereafter, after a predetermined time has elapsed, the playback unit 204 is controlled again to resume playback. When resuming after a certain time has elapsed, the pause time may be counted based on the synchronization signal of the playback unit 204, or the recording length acquired from the recording unit 203 and the current playback position. It may be calculated from the difference.

  As described above, the time-shift playback control unit 202 acquires the recording length of the recording data recorded in the storage device 205 from the recording unit 203, so that the playback ends at the time of the recording data. Can be prevented.

  FIG. 3 is a block diagram schematically showing the configuration of the time shift reproduction device according to the third embodiment of the present invention.

  FIG. 3 shows that after the start of 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 finished and is continuing, it is applied to a time shift reproduction device that resumes the reproduction from the time position at which the reproduction is finished after a predetermined time has elapsed.

  The recording unit 302 obtains video data simultaneously with the recording start instruction from the user operation unit 305, generates recording data, and records it in the storage device 304. When instructed by the user operation unit 305 to perform time shift playback, the playback unit 303 reads the recorded data continuously recorded in the storage device 304 and starts playback. The playback unit 303 notifies the time shift playback control unit 301 of the end of playback when the data cannot be continuously read from the storage device 304 and the playback up to that point ends. When 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. Then, if the recording has already ended, the time shift playback is ended as it is, and if the recording has continued, the playback unit 303 is controlled after a certain period of time and the playback end time is reached. Resume playback from the position.

  FIG. 5 is a flowchart showing processing in the time-shift playback apparatus according to the third embodiment of the present invention.

  This will be described below with reference to the flowchart of FIG.

  Based on the 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 time shift playback is instructed from the user operation unit 305 such as a remote controller, the playback unit 303 reads the recorded data recorded in the storage device 304 and starts playback (step S202). The time shift playback control unit 301 monitors the playback end notification from the playback unit 303, and repeats step S203 if the notification has not been received (N in step S203). If the notification is 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 finished or continued (steps S204 and S205). If information indicating that the process has been completed is obtained (Y in step S205), the time shift reproduction is terminated as it is (step S208). When information indicating that the playback has continued is obtained (N in step S205), after waiting for a certain amount of time to pass, the playback unit 303 is controlled to play back from the time position where playback has ended after the time has come. Is resumed (steps S206 and S207). Then, it returns to step S203.

  It should be noted that not only whether or not the information acquired from the recording unit is being recorded, but also when the recording has ended, the recording length is also acquired, and even when the recording has ended, the playback end position is recorded. If the length has not been reached, playback may be resumed.

  By performing such control, the time shift reproduction can be continued even when the reproduction reaches the end of the recorded data at that time.

  As described above, according to the present invention, the control when the reproduction catches up with the recording in the FF reproduction during the time-shift reproduction can be performed in the state of reproduction from the file.

In addition, when the recording unit and the playback unit in time-shift playback are operating based on different synchronization signals, control when playback catches up with recording without taking a margin between the recording and playback positions. It can be carried out.

1 is a block diagram schematically showing a configuration of a time shift reproduction device according to a first embodiment of the present invention. It is a block diagram which shows roughly the structure of the time shift reproducing | regenerating apparatus which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows roughly the structure of the time shift reproducing | regenerating apparatus which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows the process in the time shift reproducing | regenerating apparatus of the 1st Embodiment of this invention. It is a flowchart which shows the process in the time shift reproducing | regenerating apparatus of the 3rd Embodiment of this invention.

Explanation of symbols

101, 201: Time control unit, 102, 202, 301 ... Time shift playback control unit, 103, 203, 302 ... Recording unit, 104, 204, 303 ... Playback unit, 105, 205, 304 ... Storage device, 106, 206 305: User operation unit.

Claims (6)

A recording unit for converting the video being recorded into data;
A storage unit for recording data converted by the recording unit;
A reproducing unit for reading out the data from the storage unit and reproducing the data;
A time shift reproduction control unit for reproducing the recorded data during recording of data by the recording unit,
The time difference between the time length and the reproduction position is calculated from the time length of the data being converted and recorded by the recording unit and the reproduction position during the time-shift reproduction of the data being converted and recorded by the time shift reproduction control unit. And
If the time difference is greater than or equal to a predetermined length, playback is continued,
If the time difference is less than the predetermined length, the playback is paused,
Wherein after the pause state for a predetermined time elapses, the time shift reproduction method being characterized in that the so that to start the time shift reproduction in the reproducing section. A recording unit for converting the video being recorded into data;
A storage unit for recording data converted by the recording unit;
A reproducing unit for reading out the data from the storage unit and reproducing the data;
A time shift reproduction control unit for reproducing the recorded data during recording of data by the recording unit,
The time length of the data recorded in the storage unit is compared with the playback position, and if the time difference between the time length and the playback position is a predetermined length or longer, the playback is continued.
If the time difference is less than the predetermined length, the playback is paused,
Wherein after the pause state for a predetermined time elapses, the time shift reproduction method being characterized in that the so that to start the time shift reproduction in the reproducing section. A recording unit for converting the video being recorded into data;
A storage unit for recording data converted by the recording unit;
A reproducing unit for reading out the data from the storage unit and reproducing the data;
A time shift reproduction control unit for reproducing the recorded data during recording of data by the recording unit,
Compare the recorded time length acquired from the recording unit and the current playback position acquired from the playback unit,
If the time difference between the time length and the playback position is greater than or equal to a predetermined length, playback is continued.
If the time difference is less than the predetermined length, the playback is paused,
Wherein after the pause state for a predetermined time elapses, the time shift reproduction method being characterized in that the so that to start the time shift reproduction in the reproducing section. Recording means for converting the video being recorded into data;
Storage means for recording the data converted by the recording means;
Reproduction means for reading out the data from the storage means for reproduction;
Time shift reproduction control means for reproducing the recorded data during recording of data by the recording means,
The time shift reproduction control means calculates a time difference between the time length and the reproduction position from the time length of the data being converted and recorded by the recording means and the reproduction position of the data being reproduced by the time shift reproduction control means. Calculating means to obtain;
Means for continuing playback if the time difference is greater than or equal to a predetermined length;
Means for putting the playback into a pause state when the time difference is less than the predetermined length;
Wherein after the pause state for a predetermined time elapses, the time shift reproduction apparatus characterized by having a means for Ru to start the time shift reproduction in the reproducing section. Recording means for converting the video being recorded into data;
Storage means for recording the data converted by the recording means;
Reproduction means for reading out the data from the storage means for reproduction;
Time shift reproduction control means for reproducing the recorded data during recording of data by the recording means,
The time-shift playback control means compares the time length of the data recorded in the storage means with the playback position, and continues playback if the time difference between the time length and the playback position is greater than or equal to a predetermined length. When,
Means for putting the playback into a pause state when the time difference is less than the predetermined length;
After from the pause state for a predetermined time elapses, and means for Ru to start the time shift reproduction in the reproducing section,
A time-shift playback device comprising: Recording means for converting the video being recorded into data;
Storage means for recording the data converted by the recording means;
Reproduction means for reading out the data from the storage means for reproduction;
Time shift reproduction control means for reproducing the recorded data during recording of data by the recording means,
The time-shift playback control means compares the recorded time length acquired from the recording section with the current playback position acquired from the playback section, and continues playback if the time difference is greater than or equal to a predetermined length. When,
Means for putting the playback into a pause state when the time difference is less than the predetermined length;
Wherein after the pause state for a predetermined time elapses, the time shift reproduction apparatus characterized by having a means for Ru to start the time shift reproduction in the reproducing section.

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