JP2006228421A - Editing device, editing method, recording device, recording method and program storage recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a signal recording/reproducing device and method, etc., of which the hardware configuration is simplified and also occurrence of underflow/overflow of a storage means can be suppressed. <P>SOLUTION: The device is equipped with an integrated buffer memory 22 making an assignment of storage areas for a recording system and reproducing system to be variable, and a system controller 5 for controlling the assignment process of the storage areas of the integrated buffer memory 22 in accordance with a recording system mode or reproducing system mode desired by the user through a recording control signal input section 3 or a reproducing control signal input section 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a signal recording / reproducing apparatus for recording a signal on a recording medium and reproducing the recorded signal, and a signal recording / reproducing method executed by the apparatus.

  For example, in a video signal recording / reproducing apparatus using an optical disk as a recording medium, a buffer memory for a recording system and a reproducing system is required to compensate for a waiting time caused by a track jump of a disk drive, a seek, or the like.

  Conventionally, devices have two types of buffer memories, a recording system and a reproducing system, which are selectively used in accordance with a recording system mode or a reproducing system mode specified by the user.

  By the way, in the video signal recording / reproducing apparatus, for example, there has been a demand for reproducing a recorded video signal of a portion where time has already passed while continuing recording at the present time.

  For this purpose, it is necessary to improve the response of the reproduction system. As described above, conventionally, separate buffer memories for the recording system and the reproduction system are provided in accordance with a desired recording system mode or reproduction system mode. Since they are used properly, the control method and the hardware structure are complicated, and it is impossible to allocate the buffer memory for the recording system to the reproducing system. For this reason, in order to improve the response of the reproduction system, it is necessary to add a buffer memory for the reproduction system.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a signal recording / reproducing apparatus and method capable of simplifying the hardware configuration and suppressing occurrence of underflow and overflow of storage means. And

  In order to solve the above problems, a signal recording / reproducing apparatus according to the present invention has storage areas for a recording system and a reproducing system, and an integrated storage means for changing the allocation of each of these storage areas, and a desired recording And / or control means for controlling the storage area allocation processing of the integrated storage means in accordance with the playback mode.

  Here, the control means makes the storage area of the integrated storage means only for the recording system in the recording mode and only for the reproduction system in the reproduction mode. The control means divides the storage area of the integrated storage means into a recording system and a playback system in the simultaneous recording / reproducing mode.

  In the simultaneous recording / reproducing mode, the overflow signal generated in the storage area for the recording system is written in the storage area allocated for the reproducing system under the control of the control means. The integrated storage means is used for editing processing.

  In addition, in order to solve the above problems, the signal recording / reproducing method according to the present invention performs storage area allocation processing for the recording system and the reproducing system in the storage unit in accordance with a desired recording and / or reproducing mode. Variable.

  Here, the storage area of the storage unit is used only for the recording system in the recording mode, and only for the reproducing system in the reproduction mode. In the simultaneous recording / reproducing mode, the storage area of the storage unit is divided into a recording system and a reproducing system. In the simultaneous recording / reproducing mode, an overflow signal generated in the storage area for the recording system is written in the storage area allocated for the reproducing system. Further, the storage unit is used for editing processing.

  In this way, by integrating the buffer memory for the recording system and the playback system, the control method and the hardware configuration are simplified, and at the time of playback, a new buffer memory is allocated for playback. The reproduction response can be improved without adding a buffer memory.

  According to the signal recording / reproducing apparatus and method of the present invention, the hardware configuration is simplified by integrating the buffer memory of the recording system and the reproducing system, and the occurrence of memory underflow and overflow is higher than in the conventional case. Decrease.

  In addition, memory underflow and overflow can be suppressed even during editing.

  Embodiments of a signal recording / reproducing apparatus according to the present invention will be described below with reference to the drawings.

  In this embodiment, an input analog video signal is converted into a digital video signal and band-compressed, and a direct-input digital video signal is band-compressed and then stored in the optical disk drive 1 This is a video signal recording / reproducing apparatus that records and reproduces a compressed digital video signal recorded on the optical disc.

  As shown in FIG. 1, this video signal recording / reproducing apparatus includes an integrated buffer memory 22 for changing the allocation of storage areas for recording and reproducing systems, and a recording control signal input unit 3 or a reproduction control signal input unit 4. And a system controller 5 for controlling the storage area allocation processing of the integrated buffer memory 22 in accordance with a recording system mode or a playback system mode desired by the user.

  In FIG. 1, the storage area for the recording system of the integrated buffer memory 22 is referred to as a recording system buffer memory section 22a, and the storage area for the playback system is referred to as a playback system buffer memory section 22b. The recording buffer memory unit 22 a and the reproduction system buffer memory unit 22 b have variable areas under the control of the system controller 5 via the memory control unit 27. For example, the recording buffer memory unit 22 a occupies all of the integrated buffer memory 22 during recording. Further, at the time of reproduction, the reproduction buffer memory unit 22b occupies all. Further, at the time of simultaneous recording / reproduction, the memory capacity may be secured by half.

  The video signal recording / reproducing apparatus includes a recording processing system 10 for recording the analog video signal or digital video signal on the optical disc, and a reproduction processing system for reproducing the digital video signal recorded on the optical disc. 30.

  In addition, as shown in FIG. 2, the optical disc drive 1 records a digital video signal by irradiating a recording laser beam onto the optical disc 1a and reproduces the digital video signal by irradiating a reproduction laser beam. The head 1b and a spindle motor 1c for rotating the optical disk 1 are provided. The head 1b and the spindle motor 1c are controlled by the disk / head controller 2.

  First, the configuration and operation of the recording processing system 10 will be described. The recording processing system 10 includes, for example, a video signal processing unit 14 that performs video signal processing on a video signal input from an analog TVR, a camera signal processing unit 15 that performs signal processing on an imaging signal from the camera system, and a broadcast received by an antenna. A tuner unit 16 that performs signal processing on the video signal, a video signal switching unit 17 that switches the video signal from each signal processing unit, and a video signal that converts the switching video signal from the video signal switching unit 17 into a digital video signal An A / D converter 18, a video signal control unit 20 that switches between the converted digital video signal and a digital video signal input that is directly input, and a video that performs band compression processing on the digital video signal from the video signal control unit 20 And a signal band compression processing unit 21.

  The video signal input, camera system input, and antenna system input that are input from the input terminals 11, 12, and 13 are the video signal processing unit 14, the camera signal processing unit 15, and the tuner system signal processing unit (video system) 16, respectively. Video signal processing, camera signal processing, and tuner (video) signal processing are performed and supplied to the video signal switching unit 17.

  The video signal switching unit 17 is controlled by the system controller 5 and selects a desired video signal from each of the input video signals. The recording control signal input unit 3 supplies a recording control signal to the system controller 5 according to the contents set by the user via a user interface (not shown). Then, the desired video signal selected by the video signal switching unit 17 is supplied to the video signal A / D conversion unit 18.

  The video signal A / D conversion unit 18 converts the desired video signal into a digital signal and supplies it to the video signal control unit 20.

  In the video signal control unit 20, similarly to the video signal switching unit 17, a digital video from the video signal A / D conversion unit 18 is input from the input terminal 19 in accordance with the control of the system controller 5 according to the user setting. One of the digital video inputs is selected and supplied to the video signal band compression processing unit 21. The video signal band compression processing unit 21 performs band compression such as MPEG or JPEG on the video signal from the video signal control unit 20.

  The address of the digital video signal band-compressed by the video signal band compression processing unit 21 is designated by the memory control unit 27 controlled by the system controller 5 via the bus, and the recording buffer memory unit of the integrated buffer memory 22 22a.

  The digital video signal stored in the recording system buffer memory unit 22 a is recorded on the optical disc 1 a of the optical disc drive 1 via the bus and the data processing unit 6. In the optical disc drive 1, when a seek or track jump occurs, a waiting time occurs. When this waiting time occurs, the supply of the digital video signal from the integrated buffer memory 22 to the optical disc drive 1 must be stopped.

  Here, as shown in FIG. 2, the data processing unit 6 includes a recording signal processing unit 6a and a reproduction signal processing unit 6b. In the case of a recording processing system, the recording signal processing unit 6a functions to perform a predetermined recording process on the digital video signal for recording.

  The system controller 5 controls the optical disk drive 1 via the disk / head control unit 2 and at the same time manages the state of the optical disk drive 1, transmits the information to the memory control unit 27, and transmits the information from the integrated buffer memory 22. Control the supply of data.

  Next, the configuration and operation of the reproduction processing system 30 will be described. The reproduction processing system 30 includes a video signal band expansion processing unit 31 that performs band expansion processing on the video signal supplied from the reproduction system buffer memory unit 22b of the integrated buffer memory 22 via the bus, and the video signal band expansion processing unit. The video signal control unit 20 that switches the video signal from the video signal 31 and the video signal D / A conversion unit 32 that converts the video signal switched by the video signal control unit 20 into an analog video signal are provided.

  In the playback mode, the servo / head movement of the optical disc drive 1 is controlled by the disc / head control unit 2 and the playback video signal is output to the playback system buffer memory unit 22b via the playback signal processing unit of the data processing unit 6. To do. The reproduction-system buffer memory unit 22b supplies the reproduction video signal to the video signal band expansion processing unit 31 while balancing the writing and reading of the reproduction video signal.

  The video signal band expansion processing unit 31 performs expansion processing such as MPEG or JPEG on the reproduced video signal, and then supplies it to the video signal control unit 20.

  The video signal control unit 20 is controlled by the system controller 5 based on the information obtained via the reproduction control signal input unit 4 according to the user's setting, and switches to a digital video signal from the video signal band expansion processing unit 31 to be described later. The processed signal is supplied to the video signal D / A converter 32 or the output terminal 34.

  The video signal D / A conversion unit 32 converts the digital video signal that is switched and controlled by the video signal control unit 20 into an analog video signal and supplies the analog video signal to the output terminal 33.

  FIG. 3 shows a detailed configuration of the video signal control unit 20. The video signal control unit 20 includes a changeover switch SW1 and a changeover switch SW2. The changeover switch SW1 includes a selected terminal a to which a digital video signal input from the input terminal 19 is supplied and a selected terminal to which a digital video signal from the video signal A / D converter 18 is supplied via the input terminal 36. b, a selected terminal c to which a decoded video signal is supplied from a video signal band expansion processing unit 31 (which is an MPEG decoder for performing MPEG decoding processing), and a video signal band compression processing unit 21 (for performing MPEG encoding processing). A switching piece d for supplying a switching input to the MPEG encoder). The changeover switch SW2 is connected via a selected terminal e to which a digital video signal from the input terminal 36 is supplied, a selected terminal f to which a decoded video signal from the MPEG decoder 31 is supplied, and an output terminal 37. And a switching piece g for supplying a switching output to the video signal D / A converter 32.

  Switching of the switch SW1 and the switch SW2 in the video signal control unit 20 is controlled by the system controller 5. Specifically, an instruction from the user supplied to the system controller 5 via the recording control signal input unit 3 designates an external digital video signal from the input terminal 19 as input and records it on the optical disc 1a. If there is, the switching piece d of the switch SW1 is connected to the selected terminal a. If the digital conversion video input is designated and recorded, the switching piece d is connected to the selected terminal b. If any of the above video inputs and video data reproduced by the optical disc drive 1 are connected, edited, and recorded again on the optical disc 1a, the system controller 5 connects the switching piece d to the selected terminal c. Control timing. That is, the decoded output from the MPEG decoder 31 is directly fed back to the MPEG encoder 21. As a result, it is possible to realize connection editing in units of one frame, which will be described later.

  By the way, in the conventional video signal recording / reproducing apparatus, dedicated memories are arranged independently after the video signal band compression processing unit 21 and before the video signal band expansion processing unit 31, respectively. Are integrated into the integrated buffer memory 22.

  That is, when the signal generation amount from the video signal band compression processing unit 21 increases during recording and the waiting time of the optical disc drive 1 is large, the conventional buffer memory of the recording system overflows in the conventional video signal recording / reproducing apparatus. In this case, in the present invention, the reproduction system buffer memory unit 22b is diverted to the recording system buffer memory unit 22a under the control of the system controller 5.

  Also, during playback, if the frequency of seeks or track jumps is high, the playback dedicated buffer memory underflows. However, in the present invention, the recording buffer memory unit 22a is replaced with the playback buffer memory unit 22b. Divert.

  FIG. 4 shows a specific example of the memory access state in the integrated buffer memory 22 at the time of recording. Conventionally, since the recording system and the playback system memory were divided, the capacities thereof were 2n. However, in the present invention, the recording system buffer memory unit 22a and the playback system buffer memory unit 22b are integrated. Therefore, the memory capacity that can be used during recording is 4n.

  At present, it is assumed that up to n signals are input from the video signal band compression processing unit 21 to the integrated buffer memory 22, and the recording operation is started when the signals are stored up to n.

  Therefore, since recording is performed in Phase 1, a signal is output from the integrated buffer memory 22 and written to the optical disc drive 1. The write transfer rate to the optical disc 1a is set to double the rate input to the integrated buffer memory 22 from the video signal band compression processing unit 21. For example, when the write transfer rate from the video signal band compression processing unit 21 to the integrated buffer memory 22 is 10 Mbps, the write transfer rate to the optical disc 1a is set to 20 Mbps.

  In Phase 2, since the integrated buffer memory 22 has become empty, the optical disc drive 1 shifts to a waiting state. Alternatively, a waiting time associated with the head movement that occurs to write to another area is also included. During this time, when a signal is input from the video signal band compression processing unit 21 to the integrated buffer memory 22 and reaches n, the recording operation is shifted to Phase 3. Usually, since the capacity of the integrated buffer memory 22 is determined from the worst value of the waiting time due to head movement, the memory 22 will not overflow.

  However, when the servo is disengaged by the optical disk drive 1 due to vibrations, shocks, etc., or writing becomes impossible due to scratches, dust, etc. on the optical disk 1a, and the waiting time becomes longer than the steady state, as shown in Phase 4, to the integrated buffer memory 22 The write time becomes longer and the amount of use of the memory 22 increases.

  Conventionally, since the memory capacity of the recording system was 2n, the hatched portion in the figure overflowed and recording could not be performed. However, in this embodiment, recording does not stop because overflow does not occur.

  In Phase 5, in order to record the signal accumulated in Phase 4 in the same time as before, recording is performed at a double transfer rate (40 Mbps), for example.

  FIG. 5 shows another specific example of the memory access state during recording. Up to Phase 3 is the same as FIG. If the signal generation amount from the video signal band compression processing unit 21 is doubled for some reason in Phase 4, the buffer memory overflows in the conventional example as described above. Here, some factors are considered, for example, when a video with many scene changes is input, or when a compressed signal with an unknown bit generation amount is input digitally, and the bit rate is higher than the compression setting. It is done. However, in this embodiment, since the memory capacity of the recording buffer memory unit 22a is 4n, overflow does not occur and recording is not interrupted.

  FIG. 6 shows a specific example of the memory access state during reproduction. Here, conventionally, the memory of the recording system and the reproducing system is divided and the capacity thereof is 2n. In this embodiment, since the integrated buffer memory 22 is used, the usable memory capacity at the time of reproduction is 4n.

  At present, when signals up to 3n are output from the integrated buffer memory 22 to the video signal band expansion processing unit 31, the optical disc drive 1 starts the reproduction operation. Therefore, since reproduction is performed in Phase 1, a signal is read from the optical disk 1a and written to the integrated buffer memory 22. The write transfer rate from the optical disk drive 1 to the integrated buffer memory 22 is set to double the rate output from the integrated buffer memory 22 to the video signal band expansion processing unit 31. For example, when the rate to the video signal band expansion processing unit 31 is 10 Mbps, the read transfer rate of the optical disc 1a is 20 Mbps. In Phase 2, since the integrated buffer memory 22 is full, the optical disc drive 1 shifts to a waiting state. Alternatively, a waiting time associated with head movement that occurs to perform reading from different areas is also included.

  During this time, a signal is output from the integrated buffer memory 22 to the video signal band expansion processing unit 31. When the signal reaches 3n, a transition is made to the reproduction operation of phase 3. Usually, since the memory capacity is determined from the worst value of the waiting time due to head movement, the integrated buffer memory 22 does not underflow.

  However, when the servo of the optical disk drive 1 is disconnected due to vibration, shock, etc., reading becomes impossible, and the waiting time becomes longer than the steady state, the output time from the integrated buffer memory 22 becomes longer as shown in Phase 4, and the memory 22 The remaining amount of data is reduced to 1.5n.

  Conventionally, since the memory capacity of the reproduction system is 2n, the hatched portion in the figure underflows and the reproduction signal is interrupted. However, in the present invention, the memory capacity of the reproduction-system buffer memory unit 22b is 4n, so the underflow occurs. The playback signal is not interrupted.

  In Phase 5, reproduction is performed at, for example, a double transfer rate (40 Mbps) in order to compensate for the signal that has decreased too much in Phase 4.

  FIG. 7 shows a specific example of the memory access state at the time of simultaneous recording and reproduction. During simultaneous recording / reproduction, the integrated buffer memory 22 is divided into two parts for control. That is, 0 to 2n are used for the recording buffer memory unit 22a, and 2n to 4n are used for the reproducing buffer memory unit 22b.

  If Phase 1 is a recording operation, the recording system performs writing to the optical disc drive 1 until the memory capacity of the recording system buffer memory unit 22a is changed from 2n to 0. At the same time, the reproduction system outputs to the video signal band expansion processing unit 31. Since Phase 2 is a waiting time for head movement and the like, writing to the optical disc drive 1 is stopped in the recording system. The previous state is maintained in the reproduction system. Since Phase 3 is a reproduction operation, the recording system maintains the previous state, and the reproduction system reads from the optical disk drive 1 and writes it in the reproduction system buffer memory unit 22b. Since Phase 4 is a waiting time again, the recording system maintains the previous state, and the reproduction system stops reading. Thereafter, by repeating the operations from Phase 1 to Phae 4, synchronous recording / reproduction is realized.

  FIG. 8 shows a specific example of a memory access state when an unexpected waiting time occurs during simultaneous recording and reproduction. Phase 1 to Phase 3 are the same as described in FIG. When recording / reproduction could not be performed for some reason in Phase 4, conventionally, as shown in the figure, overflow occurred in the hatched area A, recording was interrupted, underflow occurred in the hatched area C, and reproduction was interrupted. In the present invention, since the recording and playback buffer memories are integrated like the integrated buffer memory 22, the overflow of the hatched area A can be prevented by using the hatched area B assigned to the playback system. In addition, the hatched area C cannot be prevented because there is no data, but since recording is not interrupted, buffer memory control with priority for recording can be realized.

  Further, in the video signal recording / reproducing apparatus of the present embodiment, as shown in FIG. 3, an MPEG encoder 21 and an MPEG decoder are used as the video signal band compression processing unit 21 and the video signal band expansion processing unit 31, respectively. Can be connected and edited in units of frames.

  A video signal compressed by the MPEG encoding method has a GOP structure. In general, when editing in frame units, the video signal is once converted back to an analog signal and re-encoded from the head. In the present embodiment, by feeding back from the MPEG decoder 31 to the MPEG encoder 21, only the GOP at the joint portion of editing is re-encoded, thereby minimizing the image quality degradation time.

  With reference to FIG. 9, the IN point of splice shooting editing will be described. Here, the video data reproduced from the optical disc 1 is connected to the selected terminal b of the switch SW1 of the video signal control unit 20 through the input terminal 36 and the converted digital video signal supplied from the video signal A / D conversion unit 18 is edited. The case where it does is demonstrated.

  Of the data on the optical disc 1a shown in FIG. 9A, after the B4 of GOP2, the data after Ba of the input data to be the A / D conversion output shown in FIG. 9B is connected. Is assumed. In this case, it is necessary to establish a GOP composed of B1, B2, I3, and P4 (B4) by using B4 of GOP2 as a P picture.

  In order to decode B1 and B2 of GOP2, P15 is required, and in order to decode P15, I3 is required. Therefore, when connecting and editing at B4, it is necessary to obtain data on the optical disc from GOP1 before 1 GOP.

  First, under the control of the system controller 5, the switching piece d of SW1 of the video signal control unit 20 is connected to the selected terminal c. Then, the decoded output from the MPEG decoder 31 is supplied to the MPEG encoder 21 via the switch SW1.

  The MPEG encoder 21 starts re-encoding from I3 of GOP2 as shown in FIG. When B4 is changed to P4, the system controller 5 switches the switching piece d of the switch SW1 to the selected terminal b.

  The MPEG encoder 21 subsequently encodes input data starting from Ba shown in FIG. 9B, and generates Ic, Ba, and Bb as shown in FIG. 9C. At this time, since Ba and Bb are only backward prediction, a closed GOP flag is added to the header of the GOP. As a result, the MPEG encoded outputs Ic, Ba, Bb, Pf,... Can be connected to the MPEG encoded outputs I3, B1, B2, P4 shown in FIG. 1 can be recorded.

  Here, if the MPEG encoder 21 and the MPEG decoder 31 operate asynchronously, the vertical synchronization signal becomes discontinuous and the joint is disturbed when the switch SW1 is switched. By operating in synchronization with the above, continuous connection processing is realized.

  A specific example of the memory access state at the time of editing (joint shooting IN point) is shown. Here, the read / write transfer rate from the optical disk drive 1 and the output rate of the MPEG encoder 21 (= the write rate of the recording system memory area 22a), the input rate of the MPEG decoder 31 (= reading of the playback system memory area 22b). The rate is all the same (for example, 10 Mbps).

  First, in the “reproduction 1 state (denoted as reproduction 1 in the figure)”, reading is performed from the optical disc 1a from the head of the GOP (GOP1) immediately preceding the GOP (GOP2) in which the frame to be connected exists. Write to the reproduction system memory area 22b.

  Next, when there is enough reproduction system memory area 22b, “reproduction 2” is output to MPEG decoder 31. Here, it is assumed that there is no input / output signal delay of the MPEG decoder 31. In this “reproduction 2”, writing and reading to the reproduction-system memory area 22b occur simultaneously, and the read / write rate is the same, so the memory capacity does not change.

  Next, in “wait 1”, if GOP1 and GOP2 are not continuously written on the optical disc 1a or if a waiting time due to movement of the head occurs for some reason, the reproduction-system memory area 22b is loaded from the optical disc drive 1. Is stopped and only consumed to the MPEG decoder 31, so the memory capacity is reduced as shown in the figure.

  The operations of the reproduction-system memory area 22b in “reproduction 3” and “recording reproduction 1” are the same as those in “reproduction 2”.

  When the optical disk drive 1 reads out the video signal up to B4 of GOP2 necessary for re-encoding, the reproduction operation is stopped because it is unnecessary thereafter, but the reproduction-system memory area 22b ends at the end of B4 as shown in "Recording / reproduction 2" Up to the MPEG decoder 31 is output.

  Thereafter, the reproduction system memory area 22b is not accessed until the reproduction operation is started again. ("Waiting 2", "Record 1", "Record 2"). Further, the recording memory area 22a stands by without being accessed until the recording operation is started ("reproduction 1", "reproduction 2", "wait 1", "reproduction 3").

  Next, the selection piece d of the change-over switch SW1 is connected to the selected terminal c, and at the same time as the re-encoded signal is output from the MPEG encoder 21, the recording-system memory area 22a starts writing and outputs a signal to some extent. Accumulate ("recording / reproduction 1", "recording / reproduction 2", "wait 2").

  As shown in “Recording 1”, when writing to the optical disc drive 1 starts, supply and consumption become the same, so the memory capacity of the recording system memory area does not change.

  After the output from the MPEG encoder 21 is completed, as shown in “Recording 2”, writing of all data remaining in the recording-system memory area 22a to the optical disk drive 1 is completed.

  Next, the OUT point in connection editing in units of one frame will be described with reference to FIG. A case will be described in which the data B11 and subsequent data on the optical disk shown in FIG. 10A is connected after the input data Pf which is the A / D conversion output in FIG. Here, the input data is a converted digital video signal supplied from the video signal A / D converter 18 to the selected terminal b of the switch SW1 of the video signal controller 20 via the input terminal 36.

  In this case, the MPEG encoder 21 performs re-encoding from B11 to P17 and outputs (c) in FIG. That is, initially, the switching selection piece d of the switch SW1 is connected to the selected terminal b, so that the MPEG output from the MPEG encoder 21 to the optical disc 1 is Ic, Ba, Bb, Pf, Bd, and Be. Up to this point, when the MPEG encoder 21 encodes and the optical disk drive 1 records, the system controller 5 switches the switch SW1 to the selected terminal c and at the same time enters a mode for reproducing data from the optical disk 1a. To the MPEG decoder 31 is supplied with data after the joint B11.

  The MPEG encoder 21 re-encodes the MPEG decoded output B11 and the subsequent ones shown in FIG. 10B, and recreates them as I13, B11, B12,. The output shown in (d) of FIG. 10 from the MPEG encoder 21 becomes the write data shown in (e) of FIG.

  Since B11 and B12 are only backward prediction, a closed GOP flag is added to the GOP header. Further, since B16 and B17 of the next GOP cannot be decoded, a Broken Link flag is added to the GOP header.

  A specific example of the memory access state at the time of editing (splice shooting OUT point) will be described with reference to FIG. The various conditions are the same as in FIG.

  First, in “reproduction 1”, reading is performed from the optical disk 1a from the head of the GOP (GOP1) immediately before the GOP (GOP2) in which the frame to be connected exists, and writing is performed in the reproduction system memory area 22b. .

  Next, when the reproduction system memory area 22b has accumulated to some extent, it is output to the MPEG decoder 31 ("reproduction 2", "recording reproduction 1, 2, 3"). Here, it is assumed that there is no input / output signal delay of the MPEG decoder 31. In “Playback 2”, the writing and reading of the playback-system memory area 22b occur simultaneously, and the read / write rate is the same, so the memory capacity does not change.

  In “recording / reproducing 4”, reading by the optical disc drive 1 is completed, so only output to the MPEG decoder 31 is performed, and “recording 2” is completed.

  The recording system memory area 22a stands by without being accessed until the recording operation is started. ("Playback 1", "Playback 2").

  Next, the selection piece d of the changeover switch SW1 is connected to the selected switch b, the output of the video signal A / D converter 18 is supplied from the input terminal 36 to the MPEG encoder 21, and the encoded data is output from the MPEG encoder 21. At the same time, as shown in “Recording / reproducing 1”, the recording-system memory area 22a starts writing and accumulates a signal to some extent.

  When writing to the optical disk 1a is started in the optical disk drive 1, the supply and consumption are the same, so the memory capacity does not change ("recording reproduction 2, 3, 4", "recording 2").

  After the output from the MPEG encoder 21 is finished, as shown in “Record 3”, the optical disc drive 1 finishes writing all the data remaining in the recording system memory area 22a to the optical disc 1a.

  Here, it ends with I18 of GOP3 because B16 and B17 of GOP3 cannot be predicted from P17, so it is necessary to attach a broken link flag, and it is sufficient to read I18 for that purpose. .

  As described above, in the video signal recording / reproducing apparatus shown in FIG. 1, by using the integrated buffer memory 22, editing processing using the MPEG system can be realized without causing an underflow or an overflow.

  The video signal recording / reproducing apparatus shown in FIG. 1 may be configured as shown in FIG. That is, the integrated buffer memory 22 may be provided closer to the video signal band compression processing unit 21 and the video signal band expansion processing unit 31 than the bus 7.

  Furthermore, although the above embodiment is a video signal recording / reproducing apparatus for recording / reproducing a video signal, the present invention uses the video / audio signal recording / reproducing apparatus shown in FIGS. 12 to 14 as another embodiment. You can also.

  A video and audio signal recording / reproducing apparatus according to another embodiment will be described below.

  As shown in FIG. 12, the video and audio signal recording / reproducing apparatus is a recording processing system for recording a video signal and an audio signal input via input terminals 80 and 90 on, for example, an optical disc 100 which is an example of a recording medium. 110 and a recording processing system buffer memory unit 160, and a reproduction system buffer memory unit 170 for reproducing the video and audio signals recorded on the optical disk 1a shown in FIG. A reproduction processing system 200.

  The video and audio signal recording / reproducing apparatus controls a rotation speed of the optical disc 1a in the optical disc drive 100, and controls an optical head for writing / reading video / audio signals by irradiating the optical disc 1a with laser light. The head control unit 101, the recording control signal input unit 102 for inputting a control signal for recording the video and audio signals to the optical disc drive 100 via a human interface (not shown), and the video and audio signals from the optical disc 100. Based on the reproduction control signal input unit 103 for inputting a control signal for reproduction via a human interface, and the recording control signal and the reproduction control signal supplied from the recording control signal input unit 102 and the reproduction control signal input unit 103. System for controlling each processing system or control unit Comprising a controller 104.

  The basic operation of the video and audio signal recording / reproducing apparatus will be described.

  First, the recording operation will be described. Video and audio signals input via the input terminals 80 and 90 are supplied to the recording processing system 110. The recording processing system 110 performs predetermined signal processing on the video signal and the audio signal, and supplies them to the recording-system buffer memory unit 160. The recording-system buffer memory unit 160 outputs a signal to the optical disc drive 100 while balancing the writing and reading of the signal. In the optical disk drive 100, the rotation of the optical disk 1a is controlled by the disk / head control unit 101, and the above-described signal is recorded by controlling the servo such as the movement of the optical head.

  This recording operation is executed according to the procedure described below. When a user presses a recording button for designating a recording mode on an operation unit (not shown), the recording control signal input unit 102 generates a recording control signal, which is transmitted to the system controller 104 via a human interface, The system controller 104 gives an instruction according to the recording control signal to each processing system and control unit.

  Next, the reproduction operation will be described. In the playback mode, the optical disk drive 100 controls servo, head movement, etc. by the disk / head control unit 101 and outputs a playback signal to the playback system buffer memory unit 170. The reproduction system buffer memory unit 170 outputs the reproduction signal to the reproduction processing system 200 while balancing the writing and reading of the reproduction signal. The reproduction processing system 200 performs predetermined signal processing on the reproduction signal to obtain a video signal and an audio signal output, and supplies them to output terminals 250 and 260.

  This reproduction operation is executed according to the procedure described below. When the user presses a playback button for designating a playback mode on the operation unit, the playback control signal input unit 103 generates a playback control signal, and this playback control signal is transmitted to the system controller 104 via the human interface. 104 gives an instruction according to the reproduction control signal to each processing system and control unit.

  Also in this video and audio signal recording / reproducing apparatus, the recording buffer memory unit 160 and the reproducing buffer memory unit 170 are integrated into one memory to form an integrated buffer memory 150.

  Conventionally, a buffer memory unit for recording system and a buffer memory unit for playback system are provided separately. For example, in order to improve playback response, it is necessary to add a buffer memory dedicated to playback. was there. However, by using the integrated buffer memory 150 as described above, the memory control method and the hardware configuration can be simplified, and the buffer memory unit 170 for the reproduction system can be allocated for the recording system at the time of recording or at the time of reproduction. Since the recording-system buffer memory unit 160 can be allocated for the reproduction system, it is possible to improve the reproduction response without further adding a reproduction-dedicated buffer memory.

  Further, in this video and audio signal recording / reproducing apparatus, when the signal reproduced from the optical disc drive 100 is edited, the edited signal can be recorded on the optical disc drive 100 again. A signal may be returned from the reproduction processing system 200 to the recording processing system 110.

  On the other hand, when the physical arrangement on the optical disc drive 100 is changed without subjecting the reproduction signal to editing processing, the reproduction signal may be recorded via the recording buffer memory unit 160.

  In the description so far, the recording process and the reproduction process are performed independently. However, in the case where the recording process and the reproduction process are performed simultaneously, the signal reading / writing in the optical disc drive 100 is performed in a time-sharing manner. This can be realized by performing compensation with the integrated buffer memory 150.

  FIG. 13 shows a detailed configuration of the recording processing system 110. The recording processing system 110 includes a video signal recording processing system 111 that performs recording processing on the video signal, and an audio signal recording processing system 125 that performs recording processing on the audio signal.

  First, the video signal recording processing system 111 will be described. Video signal input, camera system input, and antenna system input input from the input terminals 81, 82, and 83 are respectively performed by the video signal processing unit 112, the camera signal processing unit 113, and the tuner system signal processing unit (video system) 114v. Signal processing, camera signal processing, and tuner system (video system) signal processing are performed and supplied to the video signal switching unit 115.

  The video signal switching unit 115 selects a desired video signal from the input video signals by the system controller 104. The recording control signal input unit 102 supplies a recording control signal to the system controller 104 according to the content set by the user via a user interface (not shown). The desired video signal selected by the video signal switching unit 115 is supplied to the video signal A / D conversion unit 116.

  The video signal A / D converter 116 converts the desired video signal into a digital signal and supplies the digital signal to the video signal controller 117.

  In the video signal control unit 117, similarly to the video signal switching unit 115, the digital video from the video signal A / D conversion unit 117 is input from the input terminal 84 in accordance with the control of the system controller 104 according to the user setting. One of the digital video input or the DV input input from the input terminal 85 via the DV decompression unit 118 is selected and supplied to the video signal band compression processing unit 119.

  The DV input here is a digital video camera input based on the standard of a home digital video camera, and after the DV system expansion unit 118 performs conversion so as to be compatible with the recording / reproducing apparatus. , And supplied to the video signal control unit 117.

  Further, when the recording processing system 110 uses the playback video signal from the playback processing system 200 for editing or the like, the playback video signal is supplied to the video signal control unit 117 via the input terminal 87.

  The video signal band compression processing unit 119 performs band compression such as MPEG or JPEG on the video signal from the video signal control unit 117 and supplies the video signal to the video signal switching unit 120.

  The video signal switching unit 120 switches between a compressed digital input such as digital satellite broadcast / digital TV broadcast input from the input terminal 86 via the compression method conversion unit 121 and a video signal from the video signal band compression processing unit 119. Make a selection.

  Note that data such as a computer can be input to the compressed digital input. When this compressed digital input is not compatible with the recording method of the recording / reproducing apparatus, the compression method conversion unit 121 performs conversion.

  The video signal selected by the video signal switching unit 120 is supplied to the video buffer memory unit 161 constituting the recording buffer memory unit 160. The video buffer memory unit 161 supplies the video signal to the recording data processing unit 105 via the data bus while balancing the writing of the video signal from the video signal switching unit 120 and the reading to the optical disc 100. .

  Next, the audio signal recording processing system 123 will be described. The audio signal input, microphone system input, and antenna system input that are input from the input terminals 91, 92, and 83 are respectively performed by the audio signal processing unit 124, the microphone audio processing unit 125, and the tuner system signal processing unit (audio system) 114a. Signal processing, microphone signal processing, and tuner system (audio system) signal processing are performed and supplied to the audio signal switching unit 126.

  The audio signal switching unit 126 uses the system controller 104 to select a desired audio signal from the input audio signals. The recording control signal input unit 102 supplies a recording control signal to the system controller 104 according to the content set by the user via a user interface (not shown). The desired audio signal selected by the audio signal switching unit 126 is supplied to the audio signal A / D conversion unit 127.

  The audio signal A / D converter 127 converts the desired audio signal into a digital signal and supplies the digital signal to the audio signal switching unit 128.

  In the audio signal switching unit 128, as with the audio signal switching unit 126, digital audio from the audio signal A / D conversion unit 127 is input from the input terminal 93 in accordance with the control of the system controller 104 according to the user setting. One of the digital audio input or the DV input input from the input terminal 85 via the DV system expansion unit 118 is selected and supplied to the audio signal processing unit 129.

  The audio signal switching unit 128 is supplied with the reproduced audio signal via the input terminal 94 when the recording processing system 110 uses the reproduced audio signal from the reproduction processing system 200 for editing or the like.

  The audio signal processing unit 129 includes an audio buffer memory 130 and a fade processing unit 131. When the input digital audio that is not continuous in the time axis direction is connected, the audio signal processing unit 129 corresponds to the amplitude level difference of the audio signal of the connected portion. Adjust the sound level near the joint. When the difference in amplitude level of the input digital sound at the connecting portion is equal to or smaller than a predetermined value, the fade processing unit 131 does not perform the fade process, and performs the fade process when the amplitude level difference is larger than the predetermined value. Here, the fading process is a process of fading out the front part near the joint position and fading in the rear part near the joint position. The amplitude level difference is detected by the system controller 104. Then, the system controller 104 causes the fade processing unit 131 to execute the fading process or to pass through as described above according to the amplitude difference. The audio signal processing unit 129 can reduce annoying noise in the joint portion, and can suppress the generation of noise that occurs in the joint portion during reproduction.

  The digital audio signal output from the audio signal processing unit 129 is supplied to the audio signal band compression processing unit 132. This audio signal band compression processing unit 132 performs band compression such as MPEG audio and AC-3, and supplies the result to the audio signal switching unit 133.

  The audio signal switching unit 133 switches between a compressed digital input such as digital satellite broadcast / digital TV broadcast input from the input terminal 86 via the compression method conversion unit 121 and an audio signal from the audio signal band compression processing unit 132. Make a selection.

  If the compressed digital input is not compatible with the recording method of this system, the compression method conversion unit 121 performs conversion.

  The signal selected by the audio signal switching unit 133 is supplied to the audio buffer memory unit 162 that constitutes the recording buffer memory unit 160. The recording buffer memory unit 160 as a whole is controlled by the memory control unit 164 from the video signal switching unit 120 and the audio signal switching unit 133 to the video system buffer memory unit 161 and the audio system buffer memory unit 162, respectively. Multiplexing (for example, a program stream or a transport stream of an MPEG system) is performed while adjusting the time of the supplied signal. Header information (time information, stream information, etc.) necessary for multiplexing is supplied from the system controller 104.

  The multiplexed signal is supplied to the recording data processing unit 105 so as to balance consumption and supply of the recording buffer memory unit 160 and prevent overflow or underflow.

  The recording data processing unit 105 performs recording such as data rearrangement, addition of error correction codes, and modulation such as EFM according to the recording format, and recording on the optical disc 100. As described above, the optical disk 100 is controlled by the disk / head control unit 101 such as servo / head movement, and records the recording data at a given position.

  In addition to the video buffer memory unit 161 and the audio buffer memory unit 162, the recording buffer memory unit 160 edits video and audio signals reproduced by the reproduction processing system 200 as shown in the figure. Instead, it is also provided with a rearrangement buffer memory unit 163 that is used for recording on the optical disc 100 by simply changing the recording position.

  FIG. 14 shows a detailed configuration of the reproduction processing system 200. The reproduction processing system 200 includes a video signal reproduction processing system 201 that performs reproduction processing on a video signal read from the optical disc 1 a by the optical disc drive 100, and an audio signal reproduction processing system 220 that performs reproduction processing on an audio signal read from the optical disc 100. Consists of.

  The disk / head controller 101 controls the disk rotation, and the servo, such as tracking and focusing, is controlled, and the signal read by the optical head is supplied to the reproduction data processor 106.

  The reproduction data processing unit 106 performs processing such as EFM demodulation, error correction, and data rearrangement on the read signal in accordance with the reproduction format, and supplies the reproduction data to the reproduction system buffer memory unit 170 via the data bus. To do.

  The reproduction system buffer memory unit 170 is integrated into the integrated buffer memory 150 together with the recording system buffer memory unit 160.

  In particular, the reproduction-system buffer memory section 170 includes a compression system conversion buffer memory section 171 and a video system 1 buffer memory section 172 that are used to convert the compression system when the read data is compressed data. Similar to the buffer memory unit 173 for the video system 2, the buffer memory unit 174 for the audio system 1, the buffer memory unit 175 for the audio system 2, and the relocation buffer memory unit 163 in the recording system buffer memory unit 160. The rearrangement buffer memory unit 176 is configured. The reproduction system buffer memory unit 170 constituted by each of these buffer memory units is controlled by the memory control unit 164.

  The reproduction data from the reproduction data processing unit 106 is taken into the reproduction system buffer memory unit 170 by the memory control in the memory control unit 164, and then the header is analyzed, the multiplexing is separated, and each of the buffer memories It is distributed to the department.

  For example, in the case of simultaneous 2CH playback in which two separate files recorded on the optical disc 1a of the optical disc drive 100 are played back simultaneously, the CH1 video is stored in the video system 1 buffer memory unit 172, and the audio is stored in the audio system 1 buffer memory. The CH2 video is supplied to the video system 2 buffer memory unit 173 and the audio is supplied to the audio system 2 buffer memory unit 175 to the unit 174.

  In the reproduction buffer memory unit 170, the consumption and supply are balanced under the control of the system controller 104 and the memory control unit 164, the capacity is prevented from overflowing / underflowing, and the time information in the header is used. Video and audio are time aligned. The video signal from the video system 1 buffer memory unit 172 is supplied to the video signal band expansion processing unit 202. The video signal from the video system 2 buffer memory unit 173 is supplied to the video signal band expansion processing unit 203.

  The video signal band expansion processing unit 202 and the video signal band expansion processing unit 203 perform expansion processing such as MPEG and JPEG on the respective input video signals, and then supply them to the video switching / synthesis unit 204.

  The video switching / synthesizing unit 204 is controlled by the system controller 104 based on the information obtained via the reproduction control signal input unit 103 according to the user setting, and the video signal band expansion processing unit 202 and the video signal band expansion processing unit 203 are controlled. Are subjected to processing such as switching / combination, and output to the recording processing system 110 via the video signal D / A conversion unit 205, DV system conversion unit 206, and output terminal 207. In addition, it is derived as a digital video via the output terminal 208.

  The video signal D / A conversion unit 205 performs D / A conversion on the digital video signal. The analog video signal from the video signal D / A conversion unit 205 is supplied to the video signal output unit 209, and after being subjected to processing such as chroma encoding, is derived as a video signal output 1 from the output terminal 210.

  On the other hand, the DV compression unit 206 converts the processing signal from the video switching / synthesizing unit 204 into the DV method and derives it from the output terminal 211 as a DV output. Further, the processing signal supplied from the video switching / synthesizing unit 204 to the output terminal 207 is supplied from the input terminal 87 of the recording processing system 110 to the video signal control unit 117 and used for editing processing and the like.

  When video is output simultaneously for 2CH, the video signal from the video signal band expansion processing unit 203 is supplied to the video signal D / A conversion unit 212 and converted into an analog video signal, and then the video signal is output via the video signal output processing unit 213. Thus, the video signal output 2 is derived from the output terminal 214.

  On the other hand, the audio signal band expansion processing unit 221 and the audio signal band expansion processing unit 222 of the audio signal reproduction processing system 220 expand MPEG audio, AC-3, etc. (in the case of linear PCM, expansion) to the respective input audio signals. After processing, the data is supplied to the voice switching / synthesis unit 223.

  The audio switching / synthesizing unit 223 is controlled by the system controller 104 based on information obtained via the reproduction control signal input unit 103 according to the user's setting, and from the audio signal band expansion processing unit 221 and the audio signal band expansion processing unit 222 The audio signal is subjected to processing such as switching / synthesis, and supplied to the audio signal processing unit 224.

  The audio signal processing unit 224 includes an audio system buffer memory 225 and a fade processing unit 226. When the input digital audio that is not continuous in the time axis direction is connected, the audio signal processing unit 224 responds to the amplitude level difference of the audio signal of the connected portion. Adjust the sound level near the connection part. When the amplitude level difference of the input digital sound at the connecting portion is equal to or smaller than a predetermined value, the fade processing unit 226 does not perform the fade processing, and performs the fade processing when the amplitude level difference is larger than the predetermined value. Here, the fading process is a process of fading out the front part near the joint position and fading in the rear part near the joint position. The amplitude level difference is detected by the system controller 104. Then, the system controller 104 causes the fade processing unit 226 to execute the fade process or to pass through as described above according to the amplitude difference. The audio signal processing unit 224 can reduce annoying noise in the joint portion, and can suppress the generation of noise that occurs in the joint portion during reproduction.

  The digital audio signal output from the audio signal processing unit 224 is supplied to the DV compression unit 206. Further, the signal is supplied from the output terminal 227 to the audio signal switching unit 128 via the input terminal 94 of the recording processing system 110. Further, it is derived from the output terminal 228 as a digital audio output. Furthermore, it is also supplied to the audio signal D / A converter 229.

  The audio signal D / A converter 229 performs D / A conversion on the digital audio signal from the audio signal processor 224. The analog audio signal from the audio signal D / A conversion unit 229 is supplied to the audio signal output processing unit 230. The audio signal output processing unit 230 performs various processes on the analog audio signal and supplies the analog audio signal to the output terminal 231.

  When audio is output simultaneously for 2CH, the audio signal from the audio signal band expansion processing unit 222 is supplied to the audio signal D / A conversion unit 232 and converted into an analog audio signal, and then the audio signal output processing unit 233 performs various operations. Processing is performed and the output terminal 234 is led out.

  For a device (for example, a digital video broadcast receiver or a digital TV receiver) equipped with a video / audio expansion system, the compression method conversion unit 215 uses a compression method conversion buffer memory 171 to change the compression method. After performing the conversion process, it is derived from the output terminal 216 as a compressed digital output. It is also possible to connect this output to a computer or the like.

  If recording and playback are repeated in the video signal recording / playback apparatus or the video signal and audio signal recording / playback apparatus, program fragmentation on the optical disc 1a occurs, making seamless playback difficult. In some cases, it becomes impossible to regenerate when fragmented.

  In order to solve this problem, the fragmented programs may be rearranged as shown in FIG. Specifically, as shown in FIG. 16, A, B, C, and D of the fragmented program 1 are read out, connected in the buffer memory 22 and continuously recorded.

  Since the recording / reproducing areas are integrated, fragmentation can be eliminated by only moving within the integrated buffer memory 22 or moving the pointer.

1 is a block diagram of a video signal recording / reproducing apparatus as an embodiment of a signal recording / reproducing apparatus and method according to the present invention. It is a detailed block diagram of the principal part of the video signal recording / reproducing apparatus shown in the said FIG. FIG. 3 is a detailed configuration diagram of another main part of the video signal recording / reproducing apparatus shown in FIG. It is a figure for demonstrating the specific example of the memory access state at the time of the recording of the said video signal recording / reproducing apparatus. It is a figure for demonstrating the other specific example of the memory access state at the time of the recording of the said video signal recording / reproducing apparatus. It is a figure for demonstrating the specific example of the memory access state at the time of reproduction | regeneration of the said video signal recording / reproducing apparatus. It is a figure for demonstrating the specific example of the memory access state at the time of simultaneous recording / reproducing of the said video signal recording / reproducing apparatus. It is a figure for demonstrating the other specific example of the memory access state at the time of simultaneous recording / reproducing of the said video signal recording / reproducing apparatus. It is a figure for demonstrating the specific example of the memory access state at the time of the edit by the said video signal recording / reproducing apparatus (joint shooting IN point). It is a figure for demonstrating the specific example of the memory access state at the time of the editing by the said video signal recording / reproducing apparatus (joint shooting OUT point). It is a block diagram of the modification of the said video signal recording / reproducing apparatus. It is a block diagram which shows schematic structure of the video and audio | voice signal recording / reproducing apparatus which becomes other embodiment of the signal recording / reproducing apparatus which concerns on this invention. It is a block diagram which shows the detailed structure of the recording processing system used as the principal part of the said video and audio | voice signal recording / reproducing apparatus. It is a block diagram which shows the detailed structure of the reproduction | regeneration processing system used as the principal part of the said video and audio | voice signal recording / reproducing apparatus. It is a figure for demonstrating rearrangement use of a memory when recording and reproduction | regeneration are repeated by the video signal recording / reproducing apparatus which concerns on this invention, or a video and audio | voice signal recording / reproducing apparatus. It is a figure which shows the specific example of the rearrangement use of the memory shown in the said FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Optical disk drive, 5 System controller, 22 Integrated buffer memory, 22a Recording system required buffer memory part, 22b Playback system buffer memory part, 27 Memory control part

Claims (10)

In a signal recording / reproducing apparatus for recording a signal on a recording medium and reproducing the recorded signal,
Integrated storage means having storage areas for recording system and playback system, and variable allocation of each of these storage areas;
A signal recording / reproducing apparatus comprising: a control unit that controls a storage area allocation process of the integrated storage unit according to a desired recording and / or reproduction mode.   2. The signal recording / reproducing apparatus according to claim 1, wherein the control means uses the storage area of the integrated storage means only for the recording system in the recording mode and only for the reproducing system in the reproduction mode.   2. The signal recording / reproducing apparatus according to claim 1, wherein the control unit divides the storage area of the integrated storage unit into a recording system and a reproducing system in the simultaneous recording / reproducing mode.   4. The overflow signal generated in the storage area for the recording system in the simultaneous recording / reproducing mode is written in the storage area allocated for the reproducing system under the control of the control means. Signal recording and playback device.   2. The signal recording / reproducing apparatus according to claim 1, wherein the integrated storage means is used for editing processing. In a signal recording / reproducing method for recording a signal on a recording medium and reproducing the recorded signal,
A signal recording / reproducing method characterized in that the allocation processing of the storage area for the recording system and the reproducing system of the storage unit is varied in accordance with a desired recording and / or reproducing mode.   7. The signal recording / reproducing method according to claim 6, wherein the storage area of the storage unit is used only for a recording system in a recording mode, and is used only for a reproducing system in a reproduction mode.   7. The signal recording / reproducing method according to claim 6, wherein in the simultaneous recording / reproducing mode, the storage area of the storage unit is divided into a recording system and a reproducing system.   9. The signal recording / reproducing method according to claim 8, wherein, in the simultaneous recording / reproducing mode, an overflow signal generated in the storage area for the recording system is written in the storage area allocated for the reproducing system.   7. The signal recording / reproducing method according to claim 6, wherein the storage unit is used for editing processing.

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