JP3926340B2 - Video recording / playback device - Google Patents

Description

  The present invention relates to a video recording / reproducing apparatus that realizes time-shifted reproduction by performing recording operation and reproduction operation in parallel using a randomly accessible recording medium.

  2. Description of the Related Art Conventionally, a device such as the television broadcast recording device described in Patent Document 1 is known as a device that realizes time-shifted reproduction by performing a recording operation and a reproducing operation in parallel using a randomly accessible recording medium. ing.

  FIG. 11 is a block diagram of a video recording / playback apparatus capable of time-shift playback in the prior art. The video recording / reproducing apparatus shown in FIG. 1 includes a controller (hereinafter referred to as a user controller) 1101, an A / D converter 1102, an encoder 1103, a recording apparatus 1104, a decoder 1105, a D / A A converter 1106 and a selector 1107 are provided.

  The analog video signal is input to the A / D converter 1102, digitized, and encoded by the encoder 1103. Here, as encoding processing in the encoder 1103, a technique such as MPEG (Moving Picture Expert Group) can be used. The encoded data that is the output of the encoder 1103 is recorded in the recording device 1104. The recording device 1104 is composed of a randomly accessible medium such as an HDD, an optical disk, or a memory, and can record and read recorded data. The read encoded data is decoded into video data by the decoder 1105 and converted into a video signal by the D / A converter 1106.

  The user controller 1101 transmits a control command Ctrl_d to the decoder 1105 in response to a user request, and the decoder 1105 changes the data read from the recording device in accordance with the control command Ctrl_d and executes a decoding operation. The control command Ctrl_d includes trick play such as pause, forward / reverse fast-forward playback, forward / reverse slow playback, etc., and the user performs an operation such as pausing or rewinding the program being broadcast. be able to.

  The selector 1107 switches between an input (B input) from the D / A converter 1106 and an input video signal (A input). Thereby, even if there is a large time difference between the actual broadcast screen and the screen viewed by the user due to the trick play, the actual broadcast screen can be confirmed immediately.

  Note that a mode in which the selector 1107 is switched to the B input to view an image via the recording device 1104 is referred to as a time shift playback mode, and a mode in which the selector A is switched to the A input to view an input video signal is referred to as a live playback mode.

  However, generally, in the video recording / reproducing apparatus as described above, the processing time associated with encoding / recording / reproducing / decoding is inevitable. Therefore, when the channel switching operation is performed in the time shift playback mode, the processing time is required from when the channel switching operation is performed until the result is reflected on the screen. For this reason, the responsiveness of the channel switching operation is poor, resulting in the user feeling stressed. On the other hand, in live playback mode, since the input video signal is directly watched, the above processing time does not take and the response speed of channel operation is good, but switch to time shift playback mode for trick play etc. When this happens, the viewing screen goes back in the past by the above processing time, giving the user a sense of incongruity.

  Therefore, a video recording / reproducing apparatus described in Patent Document 2 has been proposed to solve the above problem. FIG. 12 is a block diagram of the video recording / reproducing apparatus described in Patent Document 2. Here, the part which attached | subjected the same code | symbol in the figure represents the same thing.

  The video recording / playback apparatus shown in the figure includes a user controller 1203, an A / D converter 1102, a semiconductor recording apparatus 1201, an encoder 1103, a disk recording apparatus 1104, a decoder 1105, a selector 1202, A D / A converter 1106 and a selector 1107 are provided.

  The video recording / reproducing apparatus shown in FIG. 12 has a configuration in which a semiconductor recording apparatus 1201, a selector 1202, and a user controller 1203 capable of controlling the selector 1107 and the selector 1202 are added to the video recording / reproducing apparatus shown in FIG. ing. The semiconductor recording device 1201 extracts and sequentially records a signal that matches the reproduction state from the digitized input video signal, and the latest data is always overwritten and recorded.

  In FIG. 12, the procedure disclosed in Patent Document 2 will be described below for the transition from the live playback mode to the time shift playback mode.

  Upon receiving a trick play command from the user, the user controller 1107 switches the selector 1107 from the A input to the B input.

  In addition, the user controller 1203 switches the selector 1202 to the C input. The display is performed until there is no image data to be output from the semiconductor recording device 1201.

  When there is no more image data to be output to the semiconductor recording device 1201, the user controller 1201 switches the selector 1202 to the D input and reproduces the encoded data of the disk recording device 1104.

Since the semiconductor recording device 1201 can access data at a higher speed than the disc recording device 1104, the time difference between the input video signal and the reproduction video signal from the disc recording device 1104 can be filled. Patent Document 2 describes that smooth transition to reproduction via the disk recording device 1104 is possible.
Japanese Patent Laid-Open No. 7-30851 JP 2001-275086 A

  However, in FIG. 12, since there is no means for directly associating the image output from the semiconductor recording device 1201 and the image output from the decoder 1105, the selector is not recognized by the user. It is difficult to switch 1202. In particular, the processing time in the disk recording device 1104 varies greatly depending on the state of the device and the random access method. Therefore, when the selector 1202 is switched according to the amount of data in the semiconductor recording device 1201 as in the conventional procedure, In this case, the output of the decoder 1105 and the output of the semiconductor recording device 1201 do not match, and the user may perceive that the time on the display screen has changed.

  In view of the above, the present invention provides a video recording / playback apparatus capable of switching between input video signal playback and timeshift playback without allowing the user to recognize the switching between the live playback mode and the timeshift playback mode. The purpose is to provide.

A video recording / reproducing apparatus according to the present invention is a video recording / reproducing apparatus that realizes time-shifted reproduction by performing a recording operation and a reproducing operation in parallel using a randomly accessible recording medium. A frame memory that outputs a synchronization signal synchronized with the output timing and temporarily records image data, a time information generator that generates time information related to the time when the synchronization signal is generated, and an image data An encoder that generates encoded data and embeds the time information in the corresponding encoded data; a recording apparatus that records the encoded data output by the encoder; and the encoded data read from the recording apparatus A decoder for decoding the time information embedded in the encoded data and extracting the time information embedded in the encoded data, and the image data output from the frame memory A selector for switching between the image data output from the decoder, the frame memory, and controls the decoder and the selector, and said frame time information and the time information which is embed into the encoded data in the memory using the A controller that smoothly switches between the image data output from the frame memory and the image data output from the decoder by controlling the selector, and the controller is output from the frame memory. When switching between image data to be output and image data output from the decoder, the image data from the frame memory is reproduced, and at the same time, the time information corresponding to the image data being reproduced and output is obtained, The time value of the time information output by the decoder is the time of the image data output from the frame memory. Upon reaching the above time value information, and performs switching of the image data by controlling the selector so as to reproduce the image data from the decoder.

  Also, the video recording / reproducing apparatus according to the present invention provides a decoder in which the frame memory statically outputs the image data output to the selector, and the time information output by the decoder coincides with the time information of the still output image data. Is temporarily stopped and the selector is switched.

The video recording / reproducing apparatus according to the present invention also reproduces the image data from the frame memory and switches the time information when switching between the image data output from the frame memory and the image data output from the decoder. The reproduction of the image data from the decoder at the time when the time value is exceeded is normal slow reproduction .

  The video recording / reproducing apparatus according to the present invention can accurately switch from the live reproduction mode to the time shift reproduction mode by using the time information. This makes it possible to switch between the live playback mode and the time shift playback mode without being perceived by the user, and it is possible to achieve both trick play by time shift playback and high-speed response to channel switching operations by live playback. it can.

  In addition, the video recording / playback apparatus according to the present invention uses the time information to accurately shift the time from the live playback mode even if the input data is input encoded data demodulated from a digital broadcast / communication signal or the like. You can switch to playback mode. Thereby, it is possible to smoothly switch between the live reproduction mode and the time shift reproduction mode without being perceived by the user.

  Embodiments of a video recording / playback apparatus according to the present invention will be described below with reference to the accompanying drawings. Moreover, the part which attached | subjected the same code | symbol in the figure represents the same thing.

<Description of First Embodiment of Video Recording / Reproducing Device 100 According to the Present Invention>
FIG. 1 shows a first embodiment of a video recording / reproducing apparatus 100 according to the present invention.

  The video recording / reproducing apparatus 100 includes a time information generator 101, a user controller 102, an A / D converter 103, a frame memory 104, an encoder 105, a recording apparatus 106, a decoder 107, and a selector 108. And a D / A converter 109.

  In the live playback mode, the input video signal is output via the A / D converter 103, the frame memory 104, the selector 108, and the D / A converter 109. At this time, the input video signal that has passed through the A / D converter 103 is once written in the frame memory 104 and output at a predetermined output timing. Here, if the output timing is always constant, the output image will not be disturbed even if the writing timing on the input side changes. That is, even when the input video signal is switched asynchronously, such as in a channel switching operation, it is possible to prevent the TV screen from being disturbed by the synchronization signal being lost on the output side. The frame memory 104 generates a synchronization signal Sync in synchronization with the image data output timing. The synchronization signal Sync is a signal generated in synchronization with the output of an encoded image such as a video frame or a video field.

  The time information generator 101 generates information Time_e related to the time when the synchronization signal Sync is received. For example, it is realized by arranging a self-running counter in the time information generator 101 and outputting the counter value when the synchronization signal Sync is received.

  The frame memory 104 outputs the image data to the encoder 105 at the timing of outputting the image data to the selector 108. In the live playback mode, the image data output to the selector 108 and the image data output to the encoder 105 are the same.

  The encoder 105 encodes the image data from the frame memory 105 and records the encoded data in the recording device 106. Here, the encoder 105 performs an operation of associating the time information Time_e with the input image data and embedding it in the encoded data. This is realized by means such as embedding Time_e in a user-defined data area of encoded data, embedding in time code data, or embedding in time stamp data for A / V synchronization.

  The decoder 107 decodes the encoded data read from the recording device 106. At this time, the time information embedded at the time of encoding is extracted and output as Time_d in synchronization with the image data output timing.

  The selector 108 selects the A input in the live playback mode, and selects the B input in the time shift playback mode.

  Hereinafter, the detailed operation of the video recording / reproducing apparatus 100 shown in FIG. 1 will be described with reference to FIGS. 2 and 3.

  FIG. 2 is a time chart for explaining a case in which a pause is instructed by the user during the live playback mode, the screen is stopped, a next play is instructed, and continuous playback is executed in the time shift playback mode.

  FIG. 3 is a flowchart showing the operation from the live playback mode until the pause operation is completed.

  In the live playback mode, the user instructs the pause (1) shown in FIG.

  In the live playback mode, the A input is selected in the selector 108 by Ctrl_s that is a command from the user controller 102 (that is, Ctrl_s = A). On the other hand, the encoder 105, the recording device 106, and the decoder 107 perform encoding / recording / reproducing / decoding operations, and output image data delayed by a predetermined processing time to the B input of the selector 108.

  In response to a pause command from the user, the user controller 102 issues a still command to the frame memory 104. This command is shown in (2) of FIG. 2, and is shown in step S301 in the flow of FIG. That is, Ctrl_e = Still command.

  Next, the user controller 102 acquires the time information Time_e at this time from the time information generator 101. The acquired Time_e at this time is Ts. In FIG. 2, Time_e = 3 is shown, and in the flow of FIG. 3, this is shown in step S302.

  In response to the still command (2) from the user controller 102, the frame memory 104 statically displays the image data output to the selector 108. Here, the time information of the image data to be statically displayed is Ts (Ts = 3 as described above).

  Note that image data output to the encoder 105 is continuously executed, and the encoder 105, the recording device 106, and the decoder 107 continue to operate.

  The user controller 102 waits for Time_d = Ts. FIG. 2 shows that Time_d = 3. In the flow of FIG. 3, this is shown in step S303.

  When Time_d becomes Time_d = Ts, the user controller 102 issues a pause command (Ctrl_d = pause command) to the decoder 107. This pause command is indicated by (3) in FIG. 2, and is shown in step S304 in the flow of FIG.

  In response to the pause command, the decoder 107 pauses and stops the output image data. Here, the time information of the stationary output image data is Ts (Ts = Time_d = 3 in FIG. 2).

  Note that the encoder 105 continues to encode image data.

The user controller 102 sets Ctrl_s = B and switches the selector 108 to the B input (step 305 in FIG. 3). This shifts to the time shift playback mode.
Since the time information Ts of the image data that is still output from the frame memory 104 and the time information Time_d of the image data that is output statically from the decoder 107 match, the displayed image does not change. Therefore, switching from the live playback mode to the time shift playback mode can be executed without the user's perception.

  Next, the user instructs play. This play instruction is indicated by (4) in FIG.

  Upon receiving a play command from the user, the user controller 102 issues a Ctrl_d = play command (Ctrl_d = play command). This play command is indicated by (5) in FIG.

  Here, in response to Ctrl_d = play command, the decoder 107 resumes reproduction.

  In FIG. 2, the playback is resumed after the pause of (1). However, when the forward / reverse fast forward playback is instructed in (4), the Ctrl_d is changed to a corresponding command to return to the trick play. Can be migrated. Also, when reverse fast forward playback is instructed in (1), that is, when transitioning from live playback mode to reverse fast forward playback, a Ctrl_d = reverse fast forward playback command is issued in (3) to thereby generate a time shift playback mode. After moving to, reverse fast-forward playback can be executed immediately.

  In the first embodiment, switching from the live playback mode to the time shift playback is based on the time information when paused and the time information output by the decoder 107, not based on the presence or absence of data as in the conventional example. Therefore, accurate and natural switching can be realized.

  Next, an operation for shifting from the time shift playback mode to the live playback mode will be described.

  FIG. 4 shows a timing chart when shifting from the time shift playback mode to the live playback mode.

  When a channel switching operation or the like occurs in the time shift playback mode, the live playback mode can be restored by switching the selector 108 to the A input.

  Here, in the channel switching operation, since irrelevant screens are continuous before and after switching, even if the time shift playback mode is immediately switched to the live playback mode in synchronization with the switching timing, the user does not feel uncomfortable. . Also, the response speed to the channel operation can be improved by immediately shifting to the live reproduction mode.

  In the time shift playback mode, a channel switching operation or the like is performed, and the user instructs live in accordance with this. This live instruction is indicated by (1) in FIG. In the time shift reproduction mode, Ctrl_s = B, and the selector 108 selects the B input.

  The user controller 102 issues a play command (Ctrl_e = play command) to the frame memory 104. The play command is a command for instructing start of output of the frame memory 104. In FIG. 4, it is indicated by (2) play. In FIG. 4, the frame a, b, c,... Are output in response to the play command (2) from the state in which the frame 3 is stationary.

  At this time, Ctrl_s = A is simultaneously set, and the output of the selector 108 is switched from the B input to the A input. As a result, the image data of the frame memory 104 that has been output is displayed.

  The user controller 102 issues a Ctrl_d = live command to the decoder 107. In FIG. 4, it is shown by (3) live. The live command is a command for instructing the decoder 107 to reproduce the latest encoded data, and the amount of time shift in time shift reproduction is minimized. This operation is performed in order to improve the response speed when shifting from the live reproduction mode to the time shift reproduction mode next time.

  The time shift amount is a difference between the input time Time_e of the image data to the encoder 105 and the output time Time_d of the image data from the decoder 107, and a user command is generated by minimizing the time shift amount. The time difference between the time (Ts = Time_e) and the time (Time_d = Ts) when shifting from the live playback mode to the time shift playback mode can be minimized. That is, the response speed to the user command can be improved.

  Even if a channel switching operation is performed during the time shift playback mode by the above operation, the mode is switched from the time shift playback mode to the live playback mode without being perceived by the user, and the channel is switched at a good response speed. The operation can be performed.

  In FIG. 2, the decoder 107 is described as always operating. However, the decoder 107 is stopped in the live playback mode, and when the Ctrl_e = still command is issued, the Ctrl_d = live command is sent to the decoder 107. It is also possible to configure such that it is issued and activated. In FIG. 4, instead of issuing a live command of Ctrl_d = (3) to the decoder 107, it is also possible to issue a Ctrl_d = stop command to stop the decoder 107 in the live playback mode. By these operations, it is possible to stop the operation of the decoder 107 whose output is not displayed in the live reproduction mode and reduce power consumption.

<Description of Second Embodiment of Video Recording / Reproducing Apparatus 100 according to the Present Invention>
FIG. 5 shows a block diagram of a second embodiment of the video recording / reproducing apparatus 100 according to the present invention. The video recording / reproducing apparatus 100 according to the second embodiment includes a time information generator 101, a user controller 502, an A / D converter 103, a frame memory 501, an encoder 105, a recording device 106, and a decoding device. A device 107, a selector 108, and a D / A converter 109 are provided.

  The configuration of FIG. 5 is the same as the configuration of FIG. 1 except for the user controller 502 and the frame memory 501. The difference is that time information Time_f is output from the frame memory 501 to the user controller 502.

  In the present embodiment, a slow playback function is added to the frame memory 501, and when moving from the live playback mode to the normal slow playback, the frame memory 501 performs the normal slow playback instead of the still image, thereby changing the live playback mode. To achieve a smoother transition from time to time shift playback mode.

  As a command for the frame memory 501, Ctrl_e = forward slow playback command is added. The normal slow reproduction can be realized by updating the output frame at a rate of once every predetermined time in the image data output to the selector 108. Here, Time_f is time information of image data output to the selector 108.

  FIG. 6 is a timing chart for explaining the operation of the video recording / reproducing apparatus 100 in FIG. FIG. 7 is a flowchart showing the operation from the live playback mode to the transition to the normal slow playback.

  The operation of the video recording / playback apparatus will be described below with reference to FIGS.

  In live playback mode, the user instructs normal slow playback. This normal slow playback instruction is indicated by (1) in FIG. Since Ctrl_s = A in the live playback mode, the selector 508 selects the A input.

  In response to the slow playback command from the user, the user controller 502 issues a normal slow command (Ctrl_e = normal slow command) to the frame memory 501. In FIG. 6, Time_e = 3 is shown, and in the flow of FIG. 7, this is shown in step S701.

  In response to the normal slow command, the frame memory 501 controls the output frame update speed of the image data output to the selector 108 and performs normal slow reproduction. At this time, time information Time_f corresponding to the output frame is output to the user controller 502.

  The user controller 502 waits for Time_d ≧ Time_f (step S702 in FIG. 7; No).

  The frame memory 501 performs normal slow reproduction, and the decoder 107 performs normal reproduction. For this reason, since the increase rate of Time_d is larger than the increase rate of Time_f, the condition of Time_d ≧ Time_f is always satisfied (step S702 in FIG. 7; Yes).

  When Time_d ≧ Time_f is satisfied, the user controller 502 issues a normal slow command (Ctrl_d = normal slow command) to the decoder 507. This forward slow command is indicated by (3) in FIG. 6, and is shown in step S703 in the flow of FIG.

  Upon receiving the normal slow command, the decoder 107 starts normal slow reproduction.

  The user controller 502 sets Ctrl_s = B and switches the selector 508 to the B input (step S704 in FIG. 7). This shifts to the time shift playback mode.

  When the time information of the image data output from the frame memory 501 and the time information of the image data output from the decoder 107 match, the displayed image does not change by switching, so the user Is switched from the live reproduction mode to the time-shift reproduction mode without perceiving. Even in the case of Time_d> Time_f, since the playback is in the forward direction and the time relationship of the display screen is not changed by switching, the user does not feel unnaturalness.

  In this embodiment, the frame memory 501 immediately starts slow playback when the user instructs normal slow playback, and time shift playback is performed when it is determined that the playback of the decoder 107 has caught up with the output image of the frame memory 501. Migrate to It is possible to improve the user response speed at the time of normal slow playback rather than the transition to the slow playback after the transition from the live playback mode to the time-shifted playback mode is completed after entering the pause state.

  Also in the present embodiment, switching from the live playback mode to the time shift playback is performed based on the time information output from the frame memory 501 and the decoder 107, not based on the presence or absence of data as in the conventional example. Natural switching can be realized.

<Description of Third Embodiment of Video Recording / Reproducing Device 100 According to the Present Invention>
FIG. 8 shows a block diagram of a third embodiment of the video recording / reproducing apparatus according to the present invention.

  The video recording / reproducing apparatus according to the third embodiment of the present invention includes a user controller 801, a recording apparatus 802, a selector 803, a decoder 804, and a D / A converter 805.

  This embodiment assumes an apparatus that receives digital broadcasting. In this case, the input signal becomes digitally encoded data directly from the analog video signal in FIGS. 1 and 5 via the ADC 103. Therefore, the encoder shown in FIGS. 1 and 5 is not necessary, and input data can be directly recorded in the recording device 802. Further, the decoder 804 is configured to be able to continue the decoding process with the output image still. Here, it is assumed that the time information of the decoded image is output as Time_d. Note that as the time information, data embedded in encoded data for clock adjustment of the receiving device, data for time code, time stamp information for A / V synchronization, or the like can be used.

  The operation of the video recording / reproducing apparatus will be described below with reference to FIGS.

  FIG. 9 is a timing chart for explaining the operation of the video recording / reproducing apparatus 100 in FIG.

  FIG. 9 shows a case where a pause command is issued during the live playback mode and the screen is frozen, then a play command is issued, and subsequent playback is executed in the time shift playback mode.

  FIG. 10 is a flowchart showing the operation from the live playback mode until the pause operation is completed.

  First, in the live playback mode, the user instructs a pause. This pause instruction is indicated by (1) in FIG.

  In the live playback mode, Ctrl_s = A, and the selector 803 selects the A input.

  In response to the pause command from the user, the user controller 801 issues a still command (Ctrl_d = still command) to the decoder 804. This still command indicates (2) in FIG. 9, and is shown in step S1001 in the flow of FIG.

  Further, the user controller 801 acquires the time information Time_d at this time and sets it as Ts. (Step S1002 in FIG. 10, Ts = Time_d = 3 in FIG. 9)

  Upon receiving the Ctrl_d = still command, the decoder 804 stops updating the output frame of the image data and repeatedly outputs the same image data. Here, the time information of the repeatedly output image data is Ts (Ts = 3 in FIG. 9).

  The user controller 801 selects the B input of the selector 803 as Ctrl_s = B. As a result, the encoded data read from the recording device 802 is input to the decoder 804.

  The decoder 804 continues the decoding operation and outputs the time information of the decoded image data as Time_d. Here, Time_d <Ts immediately after the selector 803 is switched, due to a delay corresponding to the recording / reproduction processing time to the recording device 802.

  The user controller 801 waits for Time_d = Ts (Time_d = 3 in FIG. 9). (Step S1004 in FIG. 10; No)

  When Time_d = Ts is satisfied (step S1004 in FIG. 10; Yes), the user controller 801 issues a Ctrl_d = pause command to the decoder 804. This pause command indicates (3) in FIG. 9, and is shown in step S1005 in the flow of FIG.

  In response to the pause command, the decoder 804 temporarily stops the decoding operation and releases the output frame update stop of the image data. However, since the decoder 804 is stopped in response to the pause command, the screen remains stationary at this time.

  This time is the switching timing from the live playback mode to the time shift playback mode. Time_d = Ts when the decoder 804 receives the still command, and Time_d = Ts when the pause command is received. Since Time_d at the time of receiving each command matches, the screen does not change by switching, and the user does not perceive switching.

  The user instructs play. This play instruction is indicated by (4) in FIG.

  Upon receiving a play command from the user, the user controller 801 issues a Ctrl_d = play command. This play command is indicated by (5) in FIG.

  Ctrl_d = Receiving the play command, the decoder 804 resumes reproduction.

  Although the arrangement of selectors and the like is different, the user can smoothly transition from the live reproduction mode to the time-shift reproduction mode by the same operation as that of FIG.

1 is a block diagram showing a first embodiment of a video recording apparatus according to the present invention. 6 is a timing chart for explaining the operation at the time of transition from the live reproduction mode to the time shift reproduction mode in the video recording apparatus. It is a flowchart which shows operation | movement until a pause operation | movement is completed from live reproduction mode. It is a timing chart explaining the operation at the time of transition from the time shift playback mode to the live playback mode. It is a block diagram which shows 2nd Embodiment of the video recording apparatus based on this invention. It is a timing chart explaining the operation | movement at the time of transfer from live reproduction mode to time shift reproduction mode (normal slow). It is a flowchart which shows operation | movement until it transfers to normal slow reproduction | regeneration from live reproduction mode. It is a block diagram which shows 3rd Embodiment of the video recording apparatus based on this invention. It is a timing chart explaining the operation | movement at the time of transfer from live reproduction mode to time shift reproduction mode. It is a flowchart which shows operation | movement until a pause operation | movement is completed from live reproduction mode. It is a block diagram of the video recording / reproducing apparatus in a prior art. It is a block diagram of the video recording / reproducing apparatus in a prior art.

Explanation of symbols

100 Video Recording / Playback Device 101 Time Information Generator 102 User Controller 103 ADC
104 Frame memory 105 Encoder 106 Recording device 107 Decoder 108 Selector 109 DAC
501 Frame memory 502 User controller 801 User controller 802 Storage device 803 Selector 804 Decoder 805 DAC
1101 User controller 1102 ADC
1103 Encoder 1104 Recording device 1105 Decoder 1106 DAC
1107 Selector 1201 Semiconductor recording device 1202 Selector 1203 User controller

Claims (3)

A video recording / reproducing apparatus that realizes time-shifted reproduction by performing a recording operation and a reproducing operation in parallel using a randomly accessible recording medium,
A frame memory that outputs a synchronization signal synchronized with the timing of outputting image data to be recorded and reproduced, and temporarily records the image data;
A time information generator for generating time information related to the time at which the synchronization signal was generated;
An encoder that generates encoded data from image data and embeds the time information in the corresponding encoded data;
A recording device for recording the encoded data output by the encoder;
A decoder that decodes encoded data read from the recording device into image data and extracts the time information embedded in the encoded data;
A selector that switches between image data output from the frame memory and image data output from the decoder;
An image output from the frame memory by controlling the frame memory, the decoder, and the selector, and controlling the selector using the time information of the frame memory and the time information embedded in the encoded data. A controller for smoothly switching data and image data output from the decoder ;
With
The controller reproduces the image data from the frame memory when switching between the image data output from the frame memory and the image data output from the decoder, and simultaneously outputs the image data being reproduced and output. When the time value of the time information output by the decoder is equal to or greater than the time value of the time information of the image data output from the frame memory, the image from the decoder is acquired. A video recording / reproducing apparatus , wherein the image data is switched by controlling the selector so as to reproduce data.   When switching between the image data output from the frame memory and the image data output from the decoder, the controller outputs the image data from the frame memory as a still image, and the time when the decoder outputs 2. The video according to claim 1, wherein when the information matches the time information of the image data output from the frame memory, the decoder is temporarily stopped and the selector is controlled to switch the image data. Recording / playback device. Reproduction of image data from the frame memory when switching between image data output from the frame memory and image data output from the decoder, and the decoder when the time value of the time information is exceeded 2. The video recording / reproducing apparatus according to claim 1, wherein the reproduction of the image data from is a normal slow reproduction .

Images