JP3747712B2 - Information signal recording / reproducing apparatus, information signal reproducing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  In the present invention, the first and second information signals based on the video information of two movies and the like and the sound information of two music and the like are received by one pickup (or head) via the first and second buffer memories. Information signal recording / reproducing apparatus and information signal reproducing apparatus for recording and / or reproducing information signal recording medium such as light or magnetism in time divisionIn placeIt is related.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an optical disc apparatus (for example, a DVD player) that uses an optical disc as an information signal recording medium, an information signal such as video information such as a movie or audio information such as music is compressed and recorded on an optical disc by an optical pickup and reproduced. The compressed information signal read from the optical disk by the optical pickup is expanded. In addition, in a device to which this kind of compression / decompression technology is applied, for example, a buffer memory of about 4 Mbits is provided in the device, and a signal with a transfer rate of 10.08 Mbps read from the optical disk is transmitted from this 10.08 Mbps. The difference in transfer rate is absorbed by the buffer memory when converting to a transfer rate of a signal with a low variable transfer rate.
[0003]
Furthermore, Japanese Patent Laid-Open No. 10-92158 discloses that when recording data of a plurality of stories and scenes on a recording medium, the physical movement distance of the optical pickup at the time of reproduction is small, and the reproduction device is interrupted or disturbed. A technical idea that can suppress the occurrence of the above is disclosed. Here, it is also conceivable to record, for example, a multi-angle scene obtained by photographing the same event that proceeds simultaneously from a plurality of angles on the optical disc. The time during which data cannot be reproduced while moving the position of the optical pickup is absorbed by the buffer memory. At this time, when one desired angle is selected from several types of angles from the optical disc, a signal of one angle recorded intermittently on the optical disc is selectively selected while jumping the optical pickup. The relationship between the seek time of the optical pickup and the buffer memory capacity necessary for reproducing and absorbing the continuity of the signal during this time in the buffer memory is disclosed.
[0004]
Further, the present applicant has proposed in Japanese Patent Application Laid-Open No. 6-139696 that a buffer memory absorbs a difference in transfer rate and records and reproduces two or more signals from one disk. That is, in the recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 6-139696, digital data having a first transfer rate generated by compressing the information amount of a recording signal to be recorded / reproduced is modulated in advance. A recording operation that is modulated in accordance with the method and converted into digital data for recording / reproduction having a second transfer rate higher than the first transfer rate described above, and is recorded on the recording medium; A reproduction operation in which digital data for recording / reproduction is restored to digital data having the first transfer rate and then converted to a reproduction signal and output, an information signal for recording on the recording medium, and a reproduction signal reproduced from the recording medium This is performed in a time-sharing manner so that the information signal becomes a simultaneous signal.
[0005]
[Problems to be solved by the invention]
By the way, in the recording / reproducing apparatus disclosed in the above-mentioned Japanese Patent Laid-Open No. 6-139696, when the compression ratio of one digital audio signal is 1/5, the recording / reproducing operation is favorably performed with no play time. In recent years, with the increase in density, capacity, and digitization of information signal recording media such as optical discs, two information signals are recorded in different areas of the information signal recording media. It is required to record and reproduce two information signals alternately in a time-division manner on one information signal recording medium with one optical pickup head, and the present invention is an improvement over the prior art in order to satisfy the above requirements. It is intended.
[0006]
[Means for Solving the Problems]
  The present invention has been made in view of the above problems,The following means 1) to 3) are used.
  1)An information signal recording medium provided with first and second areas for recording first and second information signals, respectively, and a management area for recording management information indicating addresses in the first and second areas Means for rotating;
  First, SecondThe first input at the transfer rate of, SecondTemporarily store information signalsOneBuffer memory,
  Information signal recording mediumAgainstMovably provided,in frontThe first and second information signals read out from the buffer memory in a time-sharing manner are faster than the first and second transfer rates.RollingAt least one head for time-division recording on the first and second areas on the information signal recording medium at a transmission rate;
  A transfer rate to the first and second information signals by the one head;RecordingInput to buffer memorydidThe difference from the transfer rate of the first and second information signalsRecordingSoak up with buffer memoryAn information signal recording / reproducing apparatus configured,
  Transfer rates of first and second information signals transferred from the buffer memory to the head ... Rp,
  The selected transfer rate Ra for inputting the first information signal to the buffer memory, Ra,
  The selected transfer rate... Rb for inputting the second information signal to the buffer memory.
  Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
  When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,
  Corresponding to the values of the transfer rate Ra and the transfer rate Rb, the necessary area of the buffer memory is secured, and the information unit amount to transfer the first information signal from the buffer memory to the head, Ya, Information unit amount... Yb for transferring the second information signal from the buffer memory to the head.
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
And the first and second information signals are recorded on the information signal recording medium.An information signal recording / reproducing apparatus.
[0007]
2)  A first area in which one of the first and second information signals is recorded in advance, a second area in which the other information signal is recorded, and addresses in the first and second areas Means for rotating an information signal recording medium provided with a management area for recording management information indicating:
  Information signal recording mediumBodyOne of the reproduced information signals is temporarily stored and output at the first transfer rate.WithTemporarily storing the other information signal input at the second transfer rateOneBuffer memory,
  Information signal recording mediumAgainstMovably provided,in frontInformation signal recording mediumBodyOne of the information signals reproduced from the first transfer rate is faster than the first and second transfer rates.RollingPrevious at feed rateRecordingBefore transferring to the buffer memoryRecordingThe other information signal input to the buffer memoryReprintThe information signal recording medium at a transmission rateTo the bodyAnd at least one head that performs time-sharing for the recording operation,
  in frontWritingTransfer rate to the first and second information signals by theRecordingBuffer memoryFromThe difference from the transfer rate of the first and second information signals to be input / outputRecordingSoak up with buffer memoryAn information signal recording / reproducing apparatus configured,
  Transfer rates of first and second information signals input / output to / from the buffer memory by the head... Rp,
  The selected transfer rate... Ra, in which the information signal to be recorded of the first and second information signals is input to the buffer memory.
  The transfer rate for outputting the information signal to be reproduced from the first and second information signals from the buffer memory ... Rb,
  Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
  When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,
  Corresponding to the values of the transfer rate Ra and the transfer rate Rb, the necessary area of the buffer memory is secured, and the information unit amount for transferring the information signal to be recorded from the buffer memory to the head. Ya , Yb, an information unit amount for transferring the information signal to be reproduced from the head to the buffer memory,
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
The first and second information signals are recorded on and reproduced from the information signal recording medium while satisfying the relational expressionAn information signal recording / reproducing apparatus.
[0008]
3)  First and second information signalsRecorded in the first and second positions respectivelyMeans for rotating the information signal recording medium;
  in frontEmotionFirst on the information signal recording medium, SecondofpositionFromTime divisionThe first regenerated, SecondTemporarily store information signalsOne to doBuffer memory,
  The first and second information signals are transferred to the first and second transfer rates.To output eachFirst and second on the information signal recording mediumpositionThe first and second information signals reproduced in a time-sharing manner from the first transfer rate are faster than the first and second transfer rates.RollingAt sending rateFrom one headin frontRecordingTime-division transfer to buffer memoryAnd
  Transfer rates of the first and second information signals transferred from the head to the buffer memory ... Rp,
  Transfer rate for outputting the first information signal from the buffer memory ... Ra,
  Transfer rate for outputting the second information signal from the buffer memory ... Rb,
  Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
  When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,
  Corresponding to the values of the transfer rate Ra and the transfer rate Rb, the necessary area of the buffer memory is secured, and the information unit amount for transferring the first information signal from the head to the buffer memory ... Ya, Information unit amount to transfer the second information signal from the head to the buffer memory... Yb
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
The first and second information signals are reproduced from the information signal recording medium satisfying the relational expressionAn information signal reproducing apparatus characterized by the above.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
  An information signal recording / reproducing apparatus and an information signal reproducing apparatus according to the present invention are described below.Example and application of the present inventionInformation signal communication equipmentApplication examplesReferring to FIGS. 1 to 15, <First Embodiment>, <ApplyThis will be described in detail in the order of example>.
[0011]
  Information signal recording / reproducing apparatus, information signal reproducing apparatus of the first embodiment according to the present invention, and the present inventionAppliedIn an information signal communication device, an information signal recording medium is an optical disc such as a DVD-RAM, a DVD-RW, a DVD + RW, a hard disc, a floppy disc.RexibleThe present invention can be applied to a magnetic disk such as a disk. In the following first and second embodiments, a case where an optical disk is applied as an information signal recording medium will be described.
[0012]
<Information Signal Recording / Reproducing Device or Information Signal Reproducing Device of First Embodiment>
FIG. 1 is a block diagram for explaining the overall configuration of an information signal recording / reproducing apparatus or information signal reproducing apparatus according to a first embodiment of the present invention.
[0013]
As shown in FIG. 1, in the information signal recording / reproducing apparatus or information signal reproducing apparatus (optical disc player) 10 of the first embodiment according to the present invention, an optical disc (information signal) is placed on a turntable 12 attached to the shaft of a spindle motor 11. (Recording medium) 13 is rotatably provided.
[0014]
Further, an optical head (hereinafter referred to as an optical pickup) 14 is provided so as to be movable in the radial direction of the optical disk 13 so as to face the optical disk 13. The optical pickup 14 described above irradiates a laser spot on the optical disk 13 with a collimator lens, an objective lens, or the like, using a semiconductor laser provided inside, although not shown in the figure, as a light source. At this time, the semiconductor laser is driven by a laser driving circuit. When recording an information signal such as an audio signal or a video signal, the input information signal is input to the laser driving circuit after being corrected by the waveform correcting circuit. The
[0015]
In addition, the system controller 22 determines a recording and / or reproduction start command by selecting a plurality of keys 23 and instructs the signal processing circuit 18 and the servo circuit 17, and the signal read from the optical pick 14 is transmitted by the preamplifier 16. The optical pickup 14 generates a focusing and tracking signal for the track on the optical disk 13 by processing the servo signal in the servo circuit 17 and generates the optical signal by the driver circuit 15. The actuator in the pickup 14 is driven to perform one-round servo control of the optical pickup 14 and feed the optical pickup 14 to reproduce the sector of the target track on the optical disk 13 based on the control data on the optical disk 13. Optical disc 1 by motor Moving the radially.
[0016]
In addition, the reproduction signal read out from the optical pickup 14 with one correction block as the minimum unit is optimized in frequency characteristics by the preamplifier 16 using an equalizer, and is subjected to PLL, and the PLL bit clock and data time A jitter generation circuit generated from the comparison of the axes is provided, and the jitter value is measured by the system controller 22 by A / D conversion, and the waveform correction circuit at the time of recording is changed according to this value.
[0017]
In addition, the signal processing circuit 18 converts the signal into a digital signal, for example, performs synchronization detection, decodes the EFM + signal on the optical disk 13 into NRZI data, performs error correction processing in units of correction blocks, and generates a sector address signal. First and second information signals to be described later are obtained. Since these first and second information signals are signals compressed at a variable transfer rate, one correction block is minimized in a track buffer memory 19 using a 64-Mbit DRAM serving as a temporary storage means. Is temporarily stored as a unit of time and the time axis of the variable transfer rate of the first and second information signals is absorbed. A signal read from the track buffer memory 19 is obtained from first and second information signals compressed based on MPEG2 by a decoder in an audio video / encoder decoder (hereinafter referred to as AV-ENDEC) 20. The audio signal and the video signal are expanded and separated, and the audio signal and the video signal are output to the display 25 through the NTSC encoder 24 as audio and video signals. Reference numerals 26 and 27 are input terminals for inputting the first and second information signals, respectively.
[0018]
In this AV-ENDEC 20, the decompression speed is determined in accordance with the recording and / or playback mode described later by the control data written on the optical disc 13, and decompression is performed according to this, and the buffer memory 21 is connected. ing.
[0019]
Further, the speed signal of the optical disk 13 generated by the PLL of the preamplifier 16 is sent to the servo circuit 17, and the optical disk 13 is controlled to rotate at CLV by this speed signal. Further, a rotational position signal such as a Hall element of the spindle motor 11 is fed back to the servo circuit 17, and a constant rotation FG control is provided from a speed signal generated from this signal. The system controller 22 performs overall control between the LSIs.
[0020]
The microcomputer in the system controller 22 recognizes key input and control data from the outside in order to set the resolution of the image to be recorded, fast scenes such as car races, etc. , A switching terminal is provided so that the recording time can be changed and the setting can be selected by an external user.
[0021]
Further, as will be described later, the user reproduces the video signal recorded on the optical disc 13, records the video signal, and records the video signal currently being recorded on the optical disc 13 as it is. The video signals and the like in different areas can be reproduced. Further, the video signal or the like can be recorded in different areas on the optical disc 13 while the video signal being currently reproduced is being reproduced as it is. Similarly, a video signal or the like can be recorded in different areas on the optical disc 13 while the video signal currently being recorded is being recorded as it is. Similarly, it is configured such that a video signal or the like in a different area on the optical disc 13 can be played back while the video signal being played back is being played back as it is. Thereby, the user can enjoy functions such as post-recording recording and back program recording.
[0022]
Here, in the information signal recording / reproducing apparatus or the information signal reproducing apparatus 10 according to the first embodiment of the present invention, the first and second areas 13a, 13b on the optical disc 13 and the first in the track buffer memory 19 are used. The first and second information signals are recorded in a time-division manner between the second areas 19a and 19 by means of a single optical pickup 14, such as video information such as two movies and audio information such as two music. Or the case of reproducing | regenerating is demonstrated using FIG. 2, FIG.
[0023]
FIG. 2 shows the information signal recording / reproducing apparatus or information signal reproducing apparatus according to the first embodiment of the present invention, in which the first and second areas on the optical disc, the first and second areas in the track buffer memory, and FIG. 3 is a diagram schematically showing a state in which the first and second information signals are recorded and / or reproduced in a time division manner by one optical pickup. In FIG. 2, the preamplifier and the signal processing circuit are not shown for easy understanding.
FIG. 3 shows the addresses of the first and second areas (data areas) and the address of the management area on the optical disc.
[0024]
As shown in FIG. 2, the first area 13a on the optical disc 13 is a data area for recording the first information signal A having the recording capacity Ya as the minimum unit for recording and reproduction (for example, the address A1 area in FIG. 3). The second area 13b is a data area for recording the second information signal B having the recording capacity Yb as the minimum unit for recording and reproduction (for example, the address B1 area in FIG. 3). At this time, the first information signal A and the second information signal B may be information that is related to each other or information that is not related at all.
[0025]
Here, as shown in FIG. 3A, the first area 13a on the optical disc 13 is separated into a plurality of areas within a range in which a seek time to be described later can be observed, and addresses A1, A2, A3 for each area. ,... Are provided so that the first information signal A can be divided and recorded. Similarly, as shown in FIG. 3B, the second area 13b on the optical disc 13 is also divided into a plurality of areas within a range in which a seek time described later can be observed, and addresses B1, B2, B3,. Thus, the second information signal B can be divided and recorded. At this time, the optical pickup 14 is between the first address area A1 in the first area 13a to be recorded or reproduced first and the first address area B1 in the second area 13b to be recorded or reproduced next. Is set in a range that can move within, for example, 1.5 seconds, in other words, the light that moves between the first information signal A and the second information signal B to be recorded or reproduced next is totally. The seek time of the pickup 14 is a maximum of 1.5 seconds.
[0026]
Returning to FIG. 2, a management area 13c is provided in the inner peripheral portion of the optical disc 13, and this management area 13c is allocated as an area of an address C {eg, address C1, C2,... Area} in FIG. If the first and second information signals A and B are not recorded in the address areas of the first and second areas 13a and 13b, the start address and end address as free areas are managed. On the other hand, when the first and second information signals A and B are recorded in the address areas of the first and second areas 13a and 13b, the first and second information signals A and B are recorded. The start address and end address associated with B, the transfer rate of these information signals, title information, copyright information, etc. are recorded and managed.
[0027]
A first buffer memory (hereinafter referred to as a first area) 19 a in the track buffer memory 19 is an area for temporarily storing the first information signal A, and the first buffer memory 19 in the track buffer memory 19. The second buffer memory (hereinafter referred to as a second area) 19b is an area for temporarily storing the second information signal B.
[0028]
  One optical pickup 14 transfers the first information signal A and the second information signal B between the optical disc 13 and the track buffer memory 19 in a time-sharing manner, and the optical pickup 14 The transfer rate Rp of the first and second information signals A and B is set to be constant, and this constant transfer rate Rp is assumed to be, for example, 25 Mbps. The first and second information signals A by the one optical pickup 14 described above,B'sThe transfer rate Rp is set to a value faster than transfer rates Ra and Rb of first and second information signals A and B described later.
[0029]
Also, the first and second information signals A and B are transferred between the track buffer memory 19 and the AV-ENDEC 20, and at this time, the transfer rate of the first information signal A is set as the transfer rate Ra. The transfer rate of the second information signal B is assumed to be the transfer rate Rb. The present invention is characterized in that the first information signal A and the second information signal B can be continuously recorded and / or reproduced as will be described later.
[0030]
Here, the transfer rates Ra and Rb of the first and second information signals A and B can be selected with priority on image quality. For example, 8 Mbps, 4 Mbps, and 2 Mbps shown in (1) to (3) below. One of the transfer rates.
(1). A mode with a transfer rate for high image quality, for example, a recording time of 2 hours at 8 Mbps,
(2). A mode with a transfer rate for slightly higher image quality, eg 4 Mbps recording time 4 hours,
(3). For example, a transfer rate for normal image quality and a recording time of 8 hours at 2 Mbps, for example.
Are prepared, and when recording on the optical disc 13, the transfer rates Ra and Rb of the first and second information signals A and B are set by designating the mode by key input by the user. 13, the compression rate at the time of recording is read out from the control data recorded in the management area 13c in association with the first and second information signals A and B, and the first and second information signals A and B are read according to this value. , B transfer rates Ra and Rb are set.
[0031]
Further, the system controller 22 shown in FIG. 1 uses the first and second areas 19a and 19b in the 64-Mbit track buffer memory 19 for the transfer rates Ra and Rb of the first and second information signals A and B, respectively. In addition to division setting according to the value (= Ra: Rb), each region 19a, 19b has an EMPTY value indicating that the storage capacity is empty and a FULL value indicating that the storage capacity is full in the first and second information. It is set according to the values of the transfer rates Ra and Rb of the signals A and B. The system controller 22 constantly monitors the remaining storage capacity between the EMPTY value and the FULL value of each of the areas 19a and 19b in the track buffer memory 19.
[0032]
As a different embodiment, the first and second areas 19a and 19b in the track buffer memory 19 are divided according to the transfer rates Ra and Rb of the first and second information signals A and B as described above. Rather than divide by recording mode or playback mode. For example, when one information signal A (B) is reproduced and the other information signal B (A) is recorded on the assumption that the two information signals A and B have the same transfer rate, the reproduced signal is somewhat reproduced during reproduction. Even if the continuity is lost, it does not cause a big problem. However, if the recording signal cannot be continuously recorded, it becomes a fatal defect. For example, the recording area occupies more area in the track buffer memory 19. Keep it. In this process, when the system controller 22 inputs a recording or reproduction instruction, the data in the track buffer memory 19 is confirmed in the same manner as described above, and it is confirmed that there is no intermediate data during reproduction or recording. To do.
[0033]
In the information signal recording / reproducing apparatus 10 of the first embodiment according to the present invention described above,
(1). First and second information signals A and B which are respectively input at the first and second transfer rates Ra and Rb and temporarily stored in the first and second areas 19a and 19b of the track buffer memory 19 are stored. When recording is performed in a time division manner on the first and second areas 13a and 13b on the optical disc 13 at a constant transfer rate Rp faster than the first and second transfer rates Ra and Rb by the optical pickup 14.
(2). One of the first and second information signals A and B having the first and second transfer rates Ra and Rb is sent from one area 13a (13b) on the optical disk 13 to the information signal A (B). Reproduced in time division by the optical pickup 14 and temporarily stored in one area 19a, (19b) of the track buffer memory 19 at a constant transfer rate Rp faster than the first and second transfer rates Ra, Rb. The other information signal B (A) is temporarily read from the other area 19b, (19a) of the track buffer memory 19 by the optical pickup 14 at a constant transfer rate Rp, and the other area 13b ( 13a) is recorded in a time-sharing manner. At this time, only one of the first and second information signals A and B can be recorded or reproduced by one optical pickup 14.
[0034]
In the information signal reproducing apparatus 10 according to the first embodiment of the present invention described above, the first and second information signals A and B having the first and second transfer rates Ra and Rb are transmitted to the first on the optical disc 13, respectively. The first and second of the track buffer memory 19 are reproduced from the first and second areas 13a and 13b by the optical pickup 14 in a time division manner and at a constant transfer rate Rp faster than the first and second transfer rates Ra and Rb. Are temporarily stored in the areas 19a and 19b, and then output to the AV-ENDEC 20 side at the first and second transfer rates Ra and Rb, respectively. At this time, only one of the first and second information signals A and B can be reproduced by one optical pickup 14.
[0035]
Here, when two information signals A and B are recorded and / or reproduced on the optical disc 13 in a time-sharing manner by one optical pickup 14, the optical pickup 13 and the track buffer memory 19 are connected via the optical pickup 14. The operating conditions for maintaining continuity during time division will be described.
[0036]
  Transfer rate to the first and second information signals A and B by the optical pickup 14... Rp (Mbps)
  Transfer rate of the first information signal A ... Ra (Mbps)
  Transfer rate of second information signal B ... Rb (Mbps)
  Minimum storage capacity of the track buffer memory 19 ... Ym (Mbit)
  Recording capacity of the first information signal A recorded in the first area 13a on the optical disc 13 ... Ya (Mbit)
  Recording capacity of the second information signal B recorded in the second area 13b on the optical disc 13 ... Yb (Mbit)
  The seek time required for the optical pickup 14 to move from the first area 13a to the second area 13b on the optical disk 13 ... Tab(S)
  The seek time required for the optical pickup 14 to move from the second area 13b on the optical disc 13 to the first area 13a ... Tba (s)
  Then, this relationship needs to satisfy the following (formula 9) to (formula 11) which are the main part of the present invention.
[0037]
  Seek time T hereab(Tba) means that recording or reproduction is stopped at the recording end position or the reproduction end position of the information signal A (B) in the area 13a (13b) on the optical disc 13, and the optical pickup 14 continues to the next area 13b (13a). The optical pickup 14 that has moved to the next area 13b (13a) confirms the address on the target track in the area 13b (13a) and finishes the preparation work for recording or reproduction. The time until the recording or reproduction of the information signal B (A) is started is shown.
[0038]
The first and second information signals input / output to / from the first and second areas 19a and 19b of the track buffer memory 19 when the two information signals A and B are recorded and / or reproduced in a time division manner. The sum of the transfer rates Ra and Rb of A and B (= Ra + Rb) is calculated between the first and second areas 13a and 13b on the optical disc 13 and the first and second areas 19a and 19b of the track buffer memory 19. The transfer rate Rp by one optical pickup 14 that transfers the first and second information signals A and B in a time division manner should not be exceeded.
[0039]
When the above case is expressed by an expression,
Rp> Ra + Rb (1 formula)
It becomes.
[0040]
The recording time or reproducing time Ta (s) at which the optical pickup 14 records or reproduces the first information signal A is Ta = Ya / Rp (Equation 2)
The recording time or reproducing time Tb (s) at which the optical pickup 14 records or reproduces the second information signal B is Tb = Yb / Rp (Equation 3)
It is.
[0041]
Further, the transfer rate Rp to the first and second information signals A and B by the optical pickup 14, the transfer rate Ra of the first information signal A and the transfer rate Rb of the second information signal B from this transfer rate Rp. The ratio to the difference value obtained by subtracting
Rp / (Rp-Ra-Rb) (4 formulas)
It is. At this time, Rp corresponds to one cycle period from the time when the first and second information signals A and B are recorded and / or reproduced in a time division manner to the next time when the first information signal A is recorded or reproduced, (Rp-Ra-Rb) corresponds to the seek period in this one cycle period.
[0042]
  On the other hand, the first and second information signals A and B are recorded or recorded and reproduced in a time division manner, and then the first information signal A is recorded or reproduced.InThe ratio between the time for one cycle and the total seek time during this one cycle period is (Ta + Tab + Tb + Tba) / (Tab + Tba) (Formula 5)
It is.
[0043]
Here, since the ratio of the above-mentioned (formula 4) and the ratio of the above-mentioned (formula 5) are in equal relation,
Rp / (Rp−Ra−Rb) = (Ta + Tab + Tb + Tba) / (Tab + Tba) (Expression 6)
When this (formula 6) is transformed,
(Ta + Tb) = (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (Expression 7)
It becomes. Substituting (Expression 2) and (Expression 3) into (Expression 7)
(Ya + Yb) = Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (Expression 8)
It becomes.
[0044]
Here, the transfer rate Rp between the optical disc 13 and the track buffer memory 19 is set to constant transfer rates Ra and Rb faster than the transfer rates Ra and Rb of the first and second information signals A and B. On the other hand, the transfer rates Ra and Rb of the first and second information signals A and B are determined by user settings at the time of recording, and are determined by the recording state recorded on the optical disc 13 at the time of reproduction. Further, since the seek times Tab and Tba of the optical pickup 14 described above are determined by the address on the optical disc 13 to be reproduced and the specifications of the apparatus, the recording and / or reproduction is performed in order to stably satisfy this relationship. For the recording capacity Ya of the first information signal A and the capacity Yb of the second information signal B, which are the minimum capacity for continuously performing the following, (Equation 9), (Equation 10), (Equation 11) Must be satisfied.
[0045]
That is,
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (Equation 9)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb) (Expression 10)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb) (Equation 11) That is, the transfer rate Rp by the optical pickup 14 and the transfer rates Ra and Rb of the first and second information signals A and B When the seek times Tab and Tba of the optical pickup 14 moving between the first and second areas 13a and 13b on the optical disc 13 are determined, the minimum recording unit of the first and second information signals A and B is determined. If the recording capacity Ya, Yb or the recording time or reproduction time Ta, Tb does not satisfy the above formulas (9) to (11), the continuity during recording and / or reproduction of both information signals A, B Will be lost.
[0046]
In short, when the two information signals A and B are recorded and / or reproduced on the optical disc 13 in a time-sharing manner, the position where the data to be recorded or reproduced following Ya or Yb exists on the optical disc 13 is Ya or It does not follow Yb and indicates that it can be continuously recorded and / or reproduced even at a distant position.
[0047]
In addition, (Equation 9) to (Equation 11) determine the recording capacities Ya and Yb of the minimum recording area of the two information signals A and B, determine the maximum size of the track buffer memory 19, and EMPTY value and FULL value are determined.
[0048]
The basic minimum storage capacity Ym of the track buffer memory 19 is
Ym> (Tb + Tab + Tba) × Ra + (Ta + Tab + Tba) × Rb (Expression 12)
Or
Ym> Ta × (Rp−Ra) + Tb × (Rp−Rb) (13)
It becomes.
[0049]
Both (12) and (13) are based on (2), (3), (10), and (11).
Ym> {(Rp−Ra) × Ra + (Rp−Rb) × Rb} × (Tab + Tba) / (Rp−Ra−Rb) (Expression 14)
It becomes.
[0050]
Therefore, basically, the first area 19a of the track buffer memory 19 for the first information signal A is secured to (Rp−Ra) × Ra × (Tab + Tba) / (Rp−Ra−Rb) or more. The EMPTY value and the FULL value are determined in this range, and the second area 19b of the track buffer memory 19 for the second information signal B is (Rp−Rb) × Rb × (Tab + Tba) / (Rp−Ra -Rb) The above is secured and the EMPTY value and the FULL value are determined within this range.
[0051]
However, this is a numerical value that has no margin in the management of the track buffer memory 19, and secondly, as shown in FIGS. 8, 11, and 14 described later, two ideal information signals A, The calculation is based on the relationship in which B switches the timing alternately and alternately. Actually, the two information signals A and B are simultaneously recorded and transferred according to the transfer rate between the two information signals A and B and the input / output timing. Since a timing at which reproduction is required occurs, it is necessary to temporarily store and absorb the information signal on one side in the track buffer memory 19 during this time interval.
[0052]
Therefore, the minimum storage capacity Ym of the track buffer memory 19 in that case is
Ym> (Ta + Tb + Tab + Tba) × (Ra + Rb) (Expression 15)
More generally, if the seek times Tab and Tba are the same fixed time and T,
Ym> (Ta + Tb + 2 × T) × (Ra + Rb) (Expression 16)
It becomes. Since the Ym value does not calculate the retry processing, the function as a shock proof memory, or other system margins, it is necessary to secure at least a value equal to or greater than this value.
[0053]
Therefore, the first area 19a of the track buffer memory 19 for the first information signal A is secured to (Ta + Tb + 2 × T) × Ra or more, and the EMPTY value and the FULL value are determined within this range, and the second information signal The second area 19b of the track buffer memory 19 for B is secured to (Ta + Tb + 2 × T) × Rb or more, and the EMPTY value and the FULL value are determined within this range.
[0054]
Also, the above (15 formula) and (16 formula) are derived from the above (2 formula), (3 formula), and (9 formula).
Ym> Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (Expression 17)
More generally, when the seek times Tab and Tba are set to T of the same fixed time required to move between the innermost circumference and the outermost circumference of the optical disc 13,
Ym> 2 * Rp * (Ra + Rb) * T / (Rp-Ra-Rb) (18 formulas)
It becomes.
[0055]
Similarly, since the Ym value does not calculate the retry processing, the function as a shock proof memory, or other system margins, it is necessary to secure at least a value equal to or greater than this value.
[0056]
Accordingly, the first area 19a of the track buffer memory 19 for the first information signal A is secured to Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb) or more, and the EMPTY value and the FULL value are set within this range. The second area 19b of the track buffer memory 19 for the second information signal B is secured to Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb) or more, and the EMPTY value and the FULL value in this range To decide.
[0057]
Here, the track buffer memory 19 is a 64 Mb track buffer memory 19 connected to the signal processing circuit 18 of FIG. 1 in this embodiment, but naturally it is 64 Mb connected to the AV-ENDEC 20 of FIG. Similarly, a part of the buffer memory 21 may be used as a track buffer memory.
[0058]
That is, the track buffer memory 19 has a transfer rate Rp to the information signals A and B by the optical pickup 14 for the information signal recording medium such as the optical disc 13 and a transfer rate Ra, It absorbs the difference in Rb. However, in this embodiment, the first information signal A and the second information signal B are required by using the 64 Mb track buffer memory 19 connected to the signal processing circuit 18 of FIG. 1 as an example. By dividing the recording capacity of one track buffer memory 19 and allocating and using the surplus area as a result of the calculation, the margin of each track buffer can be increased.
[0059]
For example, the transfer rate Ra of the first information signal A is 8 Mbps, the required storage capacity of the first area 19a of the track buffer memory 19 is 32 Mb for the first information signal A, If the transfer rate Rb of the information signal B is 4 Mbps and the required storage capacity of the second area 19b of the track buffer memory 19 is 16 Mb for the second information signal A, the remaining area is 64 Mb. The remaining 16 Mb is not left unaltered, but is divided into 2 to 1 by about 10 Mb to 5 Mb, and the storage capacity of the first area 19 a of the track buffer memory 19 is set to 32 Mb + 10 Mb = 42 Mb, and the track buffer memory 19 The track buffer memory 19 is made effective by setting the storage capacity of the second area 19b of the memory to 16Mb + 5Mb = 21Mb It can be used. Thereby, two continuous information signals A and B can be processed simultaneously.
[0060]
Here, in the case of the optical disc 13, the maximum allowable times Tmax = (Tab · max) and (Tbc · max) of the seek times Tab and Tbc by the optical pickup 14 are standardized in advance, and this maximum allowable time ( Tab · max) and (Tbc · max) are both the same value, for example, 1.5 seconds for the recordable DVD optical disc 13. Therefore, if the above conditions are applied to (Equation 9) described above,
(Ya + Yb) ≧ 2 × Rp × (Ra + Rb) × Tmax / (Rp−Ra−Rb) (Equation 19)
Substituting Tmax = 1.5 seconds into this (Equation 19),
(Ya + Yb) ≧ 3 × Rp × (Ra + Rb) / (Rp−Ra−Rb) (Expression 20)
It will be.
[0061]
Next, when two information signals A and B are recorded on the optical disc 13 in a time division manner by one optical pickup 14, it is necessary to know each empty area in the first and second areas on the optical disc 13. Alternatively, when one of the two information signals A and B is reproduced from the optical disc 13 by time division and the other is recorded on the optical disc 13 by time division, it is necessary to know the free area.
[0062]
Therefore, here, the start address and end address of the free area are identified from the interval between the start address and end address of the data area recorded in the management area 13c on the optical disc 13, and the capacity of the independent free area is calculated. Then, the capacity of the empty area and the position information of the empty area are stored together, and this is repeated to calculate and store the same for all the empty areas.
[0063]
At this time, when the transfer rate of the information signal to be recorded is three types, for example, 2, 4, and 8 Mbps, it is determined by calculation whether the capacity of each independent free area can be continuously recorded or continuously recorded and reproduced.
[0064]
For the seek time of one optical pickup 14, since the rotation of the optical disk 13 is CLV controlled, the address difference between the addresses is calculated, and the seek table stored in the program ROM in the system controller 22 is referred to. The number of track movements based on the address difference is obtained. The seek time of the optical pickup 14 is calculated by calculating a predetermined coefficient. Alternatively, the seek time of the optical pickup 14 may be set as a predetermined constant value depending on the device, or may be set as the maximum allowable seek time determined by the standard.
[0065]
Here, as a preliminary step for explaining whether or not the information signal to be recorded in the empty areas in the first and second areas 13a and 13b on the optical disk 13 in the present invention can be recorded, recording and reproduction of a general optical disk In the case of the method, when one information signal A inputted to one track buffer memory at a transfer rate Ra is recorded on an optical disc at a transfer rate Rp faster than the transfer rate Ra by one optical pickup, information to be recorded in a free area. In order to maintain the continuity of the signal, in the above (Equation 9) or (Equation 19), the portion related to the information signal B is set to zero,
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra) (Expression 21)
Or
Ya ≧ 2 × Rp × Ra × Tmax / (Rp−Ra) (Expression 22)
Should be satisfied.
[0066]
In other words, the capacity corresponding to the transfer rate of one information signal during the seek time is larger than the capacity corresponding to the difference between the transfer rate of one optical pickup and the transfer rate of one information signal input to one track buffer memory. Do not exceed. The required value of this seek time varies depending on the transfer rate of one input information signal that is a variable. Therefore, the recordable area greatly varies depending on the transfer rate of one information signal when actually recording.
[0067]
The formula (21) or (22) described here may be simplified as appropriate when it is created by software or hardware. For example, a calculation result is stored in a table in a program ROM in the system controller. You may obtain the result by referring to this.
[0068]
As a result of the above, the system controller determines the total free area capacity, the recording time (or capacity) corresponding to the recordable area at each total transfer rate, and the total free area capacity. The ratio of the capacity in the recordable free space is calculated and the recordable efficiency is displayed on the display as shown in FIG. 4, for example, to notify the user.
[0069]
On the other hand, according to the present invention, the first information signal A input to the first area 19 a in the track buffer memory 19 at the first transfer rate Ra and the second information 19 in the second area 19 b in the track buffer memory 19. The second information signal B input at the transfer rate Rb of 2 and the first and second areas on the optical disc 13 at a transfer rate Rp faster than the first and second transfer rates Ra and Rb by one optical pickup 14. When recording in time division in each free space in 13a and 13b, the addresses of the first and second areas 13a and 13b recorded in the management area 13c on the optical disc 13 are reproduced by one optical pickup 14, Each empty area in the first and second areas 13a and 13b on the optical disk 13 on which the first and second information signals A and B are recorded is searched, and one optical pickup 14 and a track The first and second information signals A and B on the optical disk 13 are transmitted to the first and second areas 19a and 19b in the buffer memory 19 while maintaining continuity during time-division recording. The system controller 22 determines whether or not recording is possible in each empty area in the second areas 13a and 13b.
[0070]
In the present invention, one of the first and second information signals A and B is reproduced from one area 13a (or 13b) of the optical disc 13, and the other information signal A (or B) is reproduced. When recording and reproducing the information signal B (or A) in the other area 13b (or 13a) of the optical disc 13 in a time-division manner with one optical pickup 14, the single optical pickup 14 uses the optical signal on the optical disc 13. The addresses of the first and second areas 13a and 13b recorded in the management area 13c are reproduced, and the other information signal B (or A) is recorded in the other area 13b (or 13a) on the optical disc 13B. An empty area is searched to maintain continuity during time-division recording / reproduction between one optical pickup 14 and the first and second areas 19a and 19b in the track buffer memory 19 during recording / reproduction. The other information signals B (or A) the system controller 22 whether or not can be recorded in free space in the second region 13b on the optical disk 13 (or the first region 13a) in state is determined.
[0071]
In either case of the recording operation of the first and second information signals A and B or the recording and reproducing operation of the first and second information signals A and B, one optical pickup 14 and a track In order to maintain continuity in time division with the first and second areas 19a and 19b in the buffer memory 19, it is determined whether or not (Equation 9) or (Equation 19) is satisfied. The information signal to be recorded in the empty area is recorded after the system controller 22 determines.
[0072]
The above formula (9) or (19) may be calculated by the system controller 22 each time recording or recording / reproducing is performed. However, the calculation results are tabulated in advance in the program ROM in the system controller 22. A result may be obtained by referring to this table.
[0073]
At this time, in the above-described (Expression 9) or (Expression 19), for example, the transfer rate Rp = 25 Mbps of the first and second information signals A and B by the optical pickup 14 is stored in the track buffer memory 19. If the sum of the transfer rates Ra and Rb of the first and second information signals A and B input and output in time division to the first and second areas 19a and 19b exceeds this, the two information signals A , B cannot be recorded or recorded, so this is also notified to the user. In this case, for example, when Ra = 8 Mbps, Rb = 17 Mbps, which does not satisfy the above-described (Equation 9) or (Equation 19). ).
[0074]
Again, as a result of the above, the system controller 22 determines the capacity of the total free area, the recording time (or capacity) corresponding to the recordable area at the total transfer rate, and the total free area. The recordable efficiency obtained by calculating the ratio of the capacity in the recordable free space to the capacity is displayed on the display 25 as shown in FIGS. 5A and 5B, for example, to notify the user.
[0075]
In the display examples shown in FIGS. 5A and 5B, for example, when one information signal with a transfer rate of 8 Mbps is recorded or reproduced in a time division manner and the other information signal is recorded in a time division manner, Effective free space and recordable efficiency are shown. This display method may show calculation results when information signals of all transfer rates are recorded or recorded / reproduced. However, when one information signal as shown in FIG. 4 is recorded, there is no space when two information signals as shown in FIGS. 5A and 5B are recorded or recorded and reproduced. It is desirable to inform the user of this because there may be a reduction in efficiency when recording the area. In the above display example, the recording time and the free space are shown at the same time, but the free space may not be displayed. Further, instead of directly displaying the transfer rate value, the transfer rate value may be displayed for high image quality, slightly high image quality, normal image quality, etc. as described above, or the recording time is 2 hours. Mode, a recording time mode of 4 hours, a recording time mode of 8 hours, and the like.
[0076]
By informing the user of the efficiency with which this relationship can be recorded, the user can set the transfer rate more efficiently.
[0077]
From this display information, the user knows the waste area and recordable time at each transfer rate, so the user can use keys and remote controls according to the video and audio information to be recorded and the free space and waste area. Enter the transfer rate and select one. When the transfer rate is not set, a predetermined value such as the maximum transfer rate may be automatically set.
[0078]
<When recording two information signals in time division>
FIG. 6 is a diagram schematically showing a mode in which the first and second information signals are recorded on the optical disc in a time-sharing manner,
FIG. 7 is a flowchart showing a state in which the first and second information signals are recorded on the optical disc in a time division manner.
FIG. 8 is a timing chart showing a state in which the first and second information signals are recorded on the optical disc in a time division manner.
[0079]
As shown in FIG. 6, the first and second information signals A and B input to the first and second areas 19a and 19b of the track buffer memory 19 at the first and second transfer rates Ra and Rb, respectively. The optical pickup 14 performs a time division recording operation on the first and second areas 13a and 13b on the optical disc 13 at a constant transfer rate faster than the first and second transfer rates Ra and Rb.
[0080]
That is, the optical disc 13 is formed so as to be recordable and reproducible. On the optical disc 13, a first area 13a for recording a first information signal A having a recording capacity Ya and a second area having a recording capacity Yb. And a second area 13b for recording the information signal B, and a management area 13c in which the start address and end address of the first and second areas 13a and 13b are recorded on the optical disc 13. Is provided.
[0081]
Further, when recording on the optical disc 13, the MPEG encoder in the AV-ENDEC 20 is a recording mode in which the user designates the transfer rates Ra and Rb of the first and second information signals A and B (transfer rate 8Mbps for high image quality, The first and second information signals A and B to be recorded can be set from the AV-ENDEC 20 to the signal processing circuit 20 (see FIG. 5), which can be set with a transfer rate of 4 Mbps for a slightly higher image quality and a transfer rate of 2 Mbps for a normal image quality. 1) temporarily stored in the first and second areas 19a and 19b of the 64 Mb track buffer memory 19 connected to 1), and at this time, the optical pickup 14 is in a standby state and tracks on the optical disk 13 to be recorded in a predetermined state. And is waiting for a kick. If the capacity of each area 19a, 19b of the track buffer memory 19 reaches the FULL value while controlling the remaining amount in each area 19a, 19b of the track buffer memory 19, an error occurs during recording on the optical disc 13. The first information signal A stored in the first area 19a of the track buffer memory 19 and the second area 19b stored in the track buffer memory 19 are added with the correction code, address and sync signal. The second information signal B is alternately read out in a time division manner, and the first information signal A read out by the optical pickup 14 at a constant transfer rate Rp faster than the transfer rates Ra and Rb is read on the first area 13a on the optical disc 13. In addition, the second information signals B are alternately recorded in the second area 13b on the optical disc 13 in a time division manner. This is repeated to perform continuous recording.
[0082]
Here, the operation of recording the two information signals A and B in a time division manner will be described with reference to FIGS. In FIG. 8, the transfer rates Ra and Rb of the first and second information signals A and B are shown at the same transfer rate for the sake of illustration, but show the same tendency even when they are different. is there.
[0083]
First, in step S51, a recording flow is started.
[0084]
Next, in step S52, the optical pickup 14 reproduces the management area 13c on the optical disc 13.
[0085]
Next, in step S53, when the optical pickup 14 reproduces the management area 13c on the optical disc 13, each empty area in the first and second areas on the optical disc 13 is searched based on the address information from the management area 13c. . Then, after searching for each empty area in the first and second areas on the optical disc 13, the system controller 22 stores the first and second empty areas in the first and second areas on the optical disc 13. Whether or not the information signals A and B can be recorded in a time-sharing manner is determined by the above-described (Equation 9) or (Equation 19), and this result is displayed on the display 25 as previously described in FIG. In addition to the display in FIG. 1, if recording is possible, the process proceeds to the next step S54.
[0086]
Next, in step S54, it is confirmed whether or not the optical pickup 14 has reached the first address area A1 (target position) in the first area 13a where recording is desired on the optical disc 13. If the address area A1 (target position) has not been reached, step S54 is continued. If the address area A1 (target position) has been reached, the process proceeds to the next step S55.
[0087]
Next, in step S55, the first information signal A sent from the AV-ENDEC 20 side at the transfer rate Ra is temporarily stored in the first area 19a of the track buffer memory 19. At this time, the system controller 22 (FIG. 1) constantly monitors the EMPTY value and the FULL value of the first area 19a in the track buffer memory 19 until the first information signal A reaches the FULL value. Stored at the transfer rate Ra.
[0088]
Next, in step S56, it is asked whether or not the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the FULL value. If the FULL value has not been reached, the process proceeds to step S55. On the other hand, if the FULL value is reached, the process proceeds to the next step S57.
[0089]
Next, in step S57, when the first information signal A reaches the FULL value, the first information signal A is read out to the optical pickup 14 side at a constant transfer rate Rp, so that the FULL value as shown in FIG. And the EMPTY value, the first information signal A decreases at a slope of the difference (Rp−Ra), while the first information signal A is reduced by the optical pickup 14 at a constant transfer rate Rp. Recorded in the area 13a.
[0090]
Next, in step S58, it is asked whether or not the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the EMPTY value. If the EMPTY value has not been reached, step S57 is executed. On the other hand, if the EMPTY value is reached, the process proceeds to the next step S59.
[0091]
Next, in step S59, since the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the EMPTY value, the optical pickup 14 moves the first area 13a on the optical disc 13 to the first area 13a. Among them, the recording in the first address area A1 is stopped. Here, after the recording of the first information signal A is stopped, the first information signal A is continuously sent from the AV-ENDEC 20 side to the first area 19a in the track buffer memory 19 at the transfer rate Ra. However, as is apparent from FIG. 8, this write operation may be completed before the period until the FULL value is reached, before the second address area A2 is started to be recorded in the first area 13a.
[0092]
Next, in step S60, the optical pickup 14 moves to the first address area B1 in the second area 13b on the optical disc 13 in order to record the second information signal B next. At this time, the seek time Tab for the optical pickup 14 to move from the first address area A1 in the first area 13a on the optical disk 13 to the first address area B1 in the second area 13b is 1.5 at the maximum. Within seconds.
[0093]
Next, in step S61, it is confirmed whether or not the optical pickup 14 has reached the address area B1 (target position) of the second area 13b on the optical disc 13. If the address area B1 (target position) is not reached, step S61 is further continued. If the address area B1 (target position) is reached, the process proceeds to the next step S62.
[0094]
Next, in step S62, the second information signal B sent from the AV-ENDEC 20 side at the transfer rate Rb is temporarily transferred to the second area 19b of the track buffer memory 19 at the transfer rate Rb until reaching the FULL value. Remembered.
[0095]
Next, in step S63, it is asked whether or not the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the FULL value. If the FULL value has not been reached, the process proceeds to step S62. On the other hand, if the FULL value is reached, the process proceeds to the next step S64.
[0096]
Next, in step S64, when the second information signal B reaches the FULL value, the second information signal B is read out to the optical pickup 14 side at a constant transfer rate Rp. Therefore, as shown in FIG. And the EMPTY value, the second information signal B decreases at a slope of the difference (Rp−Rb), while the second information signal B is reduced by the optical pickup 14 at a constant transfer rate Rp. Recorded in the area 13b.
[0097]
Next, in step S65, it is asked whether or not the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the EMPTY value. If the EMPTY value has not been reached, step S64 is executed. On the other hand, if the EMPTY value is reached, the process proceeds to the next step S66.
[0098]
Next, in step S66, since the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the EMPTY value, the optical pickup 14 moves the second area 13b on the optical disc 13 to the second area 13b. Recording in the address area B1 is stopped. Here, since the recording of the second information signal B is stopped, the second information signal B is continuously sent from the AV-ENDEC 20 side to the second area 19 b in the track buffer memory 19. As apparent from FIG. 8, the operation may be completed before the period until the FULL value is reached before the second address area B2 is started to be recorded in the second area 13b.
[0099]
Next, in step S67, the optical pickup 14 moves to the second address area A2 in the first area 13a on the optical disc 13 in order to record the first information signal A next. At this time, the seek time Tba for the optical pickup 14 to move from the first address area B1 in the second area 13b on the optical disk 13 to the second address area A2 in the first area 13a is 1.5 at the maximum. Within seconds.
[0100]
Then, when the optical pickup 14 reaches the second area A2 in the first area 13a on the optical disc 13, the process returns to step S54 and repeats in the same manner, so that the first and second information signals A and B are obtained by the optical pickup 14. Can be alternately and continuously recorded in the order of address areas A1, B1, A2, B2, A3, B3,. At this time, the address information of the first and second information signals A and B recorded in the empty areas in the first and second areas 13a and 13b on the optical disc 13 is recorded in the management area 13c after the recording is completed. .
[0101]
Note that the flow of canceling all recording by the optical pickup 14 may be inquired after step 59 or after step 66, but the operation becomes complicated and is omitted here.
[0102]
Further, in the flow of time division recording of the two information signals A and B described above, the track buffer memory 19 reaches the FULL value from the empty state in the first first cycle, but the EMPTY value in the second and subsequent cycles. Between the FULL values, the first information signal A having the recording capacity Ya and the second information signal B having the recording capacity Yb are stored.
[0103]
In the flow of time division recording of the two information signals A and B described above, in order to maintain continuity at the time division recording between the optical disc 13 and the track buffer memory 19 via one optical pickup 14, first, (Equation 9) or (Equation 19) described above is satisfied, and detailed description thereof is omitted here.
[0104]
<When recording and reproducing two information signals in time division>
FIG. 9 is a diagram schematically showing a mode in which the first and second information signals are recorded and reproduced on an optical disc in a time division manner.
FIG. 10 is a flowchart showing a state in which the first and second information signals are recorded and reproduced on the optical disc in a time-sharing manner.
FIG. 11 is a timing chart showing a state in which the first and second information signals are recorded and reproduced on the optical disc in a time division manner.
[0105]
As shown in FIG. 9, one of the first and second information signals A and B having the first and second transfer rates Ra and Rb is sent to one of the information signals A (B) on the optical disk 13. Area 13a (13b) of the track buffer memory 19 with a constant transfer rate Rp which is reproduced in a time division manner by the optical pickup 14 and faster than the first and second transfer rates Ra and Rb. The other information signal B (A) is read from the other areas 19b, 19a of the track buffer memory 19 by the optical pickup 14 at a constant transfer rate Rp, and the other area 13b (13a) on the optical disk 13 is read. ) In time division.
[0106]
Here, the operation of recording and reproducing the two information signals A and B in a time division manner will be described with reference to FIGS. In FIG. 10, the transfer rates Ra and Rb of the first and second information signals A and B are shown at the same transfer rate for the sake of illustration, but show the same tendency even when they are different. is there.
[0107]
First, in step S71, a recording / reproducing flow is started.
[0108]
Next, in step S72, the optical pickup 14 reproduces the management area 13c on the optical disc 13.
[0109]
Next, in step S73, when the optical pickup 14 reproduces the management area 13c on the optical disc 13, reproduction information and position information relating to the first information signal A recorded in advance from the management area 13c to the first area. And a free area in the second area is searched based on the address information from the management area 13c. Then, after searching for an empty area in the second area on the optical disc 13, can the system controller 22 record the second information signal B in the empty area in the second area on the optical disc 13 in a time division manner? Whether or not is determined by (Equation 9) or (Equation 19) described above, and the result is displayed on the display 25 as previously described with reference to FIG. Proceed to S74.
[0110]
Next, in step S74, it is confirmed whether or not the optical pickup 14 has reached the first address area A1 (target position) in the first area 13a where the optical pickup 14 is to be reproduced on the optical disk 13. If the address area A1 (target position) is not reached, step S74 is further continued. If the address area A1 (target position) is reached, the process proceeds to the next step S75.
[0111]
Next, in step S75, the optical pickup 14 starts reproduction from the first address area A1 in the first area 13a, and the first information signal A is transferred to the first in the track buffer memory 19 at the transfer rate Rp. Is temporarily stored in the area 19a. At this time, the system controller 22 (FIG. 1) constantly monitors the EMPTY value and the FULL value of the first area 19a in the track buffer memory 19, and the first information signal is only in the first cycle. It is stored at the transfer rate Rp until A reaches the EMPTY value.
[0112]
Next, in step S76, it is asked whether or not the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the EMPTY value. If the EMPTY value has not been reached, the process proceeds to step S75. On the other hand, if the EMPTY value is reached, the process proceeds to the next step S77.
[0113]
Next, in step S77, when the first information signal A exceeds the EMPTY value, the first information signal A is read to the AV-ENDEC 20 (FIG. 1) side at the transfer rate Ra, so that as shown in FIG. Between the EMPTY value and the FULL value, the transfer rate Rp at which the first information signal A is written to the first area 19a of the track buffer memory 19 and the first information signal A from the first area 19a to AV− The first information signal A is temporarily stored in the first area 19a while increasing at the gradient of the difference (Rp−Ra) of the transfer rate Ra read to the ENDEC 20 side.
[0114]
Next, in step S78, it is asked whether or not the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the FULL value. If the FULL value has not been reached, step S77 is performed. On the other hand, if the FULL value is reached, the process proceeds to the next step S79.
[0115]
Next, in step S79, since the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the FULL value, the optical pickup 14 moves the first area 13a on the optical disc 13 to the first area 13a. Among them, the reproduction in the first address area A1 is stopped. Here, after the reproduction of the first information signal A is stopped, the first information signal A stored in the first area 19a in the track buffer memory 19 is transferred to the AV-ENDEC 20 side at the transfer rate Ra. As is apparent from FIG. 11, this read operation may be completed before the period until reaching the EMPTY value is reached before the second address area A2 in the first area 13a starts to be reproduced.
[0116]
Next, in step S80, the optical pickup 14 moves to the first address area B1 in the second area 13b on the optical disc 13 in order to record the second information signal B next. At this time, the seek time Tab for the optical pickup 14 to move from the first address area A1 in the first area 13a on the optical disk 13 to the first address area B1 in the second area 13b is 1.5 at the maximum. Within seconds.
[0117]
Next, in step S81, it is confirmed whether or not the optical pickup 14 has reached the address area B1 (target position) of the second area 13b on the optical disc 13. If the address area B1 (target position) has not been reached, step S81 is continued. If the address area B1 (target position) has been reached, the process proceeds to the next step S82.
[0118]
Next, in step S82, the second information signal B sent from the AV-ENDEC 20 side at the transfer rate Rb is temporarily transferred to the second area 19b of the track buffer memory 19 at the transfer rate Rb until reaching the FULL value. Remembered.
[0119]
Next, in step S83, it is asked whether or not the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the FULL value. If the FULL value has not been reached, the process proceeds to step S82. On the other hand, if the FULL value is reached, the process proceeds to the next step S84.
[0120]
Next, in step S84, when the second information signal B reaches the FULL value, the second information signal B is read out to the optical pickup 14 side at a constant transfer rate Rp. Therefore, as shown in FIG. And the EMPTY value, the second information signal B decreases at a slope of the difference (Rp−Rb), while the second information signal B is reduced by the optical pickup 14 at a constant transfer rate Rp. Recorded in the area 13b.
[0121]
Next, in step S85, it is asked whether or not the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the EMPTY value. If the EMPTY value has not been reached, step S84 is executed. On the other hand, if the EMPTY value is reached, the process proceeds to the next step S86.
[0122]
Next, in step S86, since the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the EMPTY value, the optical pickup 14 moves the second area 13b on the optical disc 13 to the second area 13b. Recording in the address area B1 is stopped. Here, since the recording of the second information signal B is stopped, the second information signal B is continuously sent from the AV-ENDEC 20 side to the second area 19 b in the track buffer memory 19. As is clear from FIG. 11, the operation may be completed before the period until the FULL value is reached before the second address area B2 starts to be recorded in the second area 13b.
[0123]
Next, in step S87, the optical pickup 14 moves to the second address area A2 in the first area 13a on the optical disc 13 in order to reproduce the first information signal A next. At this time, the seek time Tba for the optical pickup 14 to move from the first address area B1 in the second area 13b on the optical disk 13 to the second address area A2 in the first area 13a is 1.5 at the maximum. Within seconds.
[0124]
Then, when the optical pickup 14 reaches the second area A2 in the first area 13a on the optical disc 13, the process returns to step S74 and repeats in the same manner, so that the first and second information signals A and B are obtained by the optical pickup 14. Can be recorded and reproduced alternately in time division in the order of address areas A1, B1, A2, B2, A3, B3,. At this time, the address information of the second information signal B recorded in the empty area in the second area 13b on the optical disc 13 is recorded in the management area 13c after the recording is completed.
[0125]
The flow for stopping all recording and reproduction by the optical pickup 14 may be inquired after step 79 or after step 86, but the operation becomes complicated, and is therefore omitted here.
[0126]
In the time division recording / reproducing flow of the two information signals described above, the second area 19b of the track buffer memory 19 reaches the FULL value from the empty state in the first first cycle. Then, the second information signal B having the recording capacity Yb is stored between the EMPTY value and the FULL value.
[0127]
In the flow of time division recording / reproduction of the two information signals A and B described above, in order to maintain continuity during time division recording / reproduction between the optical disc 13 and the track buffer memory 19 via one optical pickup 14. , Which satisfies (Equation 9) or (Equation 19) described above, will not be described in detail here.
[0128]
(When playing back two information signals in time division)
FIG. 12 is a diagram schematically showing a mode in which the first and second information signals are reproduced from the optical disc in a time division manner.
FIG. 13 is a flowchart showing a state in which the first and second information signals are reproduced from the optical disc in a time division manner.
FIG. 14 is a timing chart showing a state in which the first and second information signals are reproduced from the optical disc by time division.
[0129]
As shown in FIG. 12, the optical disk 13 is formed exclusively for reproduction. On the optical disk 13, the first information signal A having the recording capacity Ya is recorded in the first area 13a in advance, and the recording capacity is recorded. The second information signal B having Yb is recorded in advance in the second area 13b, and this optical disc 13 is reproduced by the information signal reproducing apparatus 10 dedicated for reproduction.
[0130]
Here, the optical pickup 14 time-divides the first information signal A recorded in the first area 13a on the optical disc 13 and the second information signal B recorded in the second area 13b. The first information signal A obtained by alternately reproducing is reproduced in the first area 19a in the track buffer memory 19, and the second information signal B obtained by reproducing is reproduced in the track buffer memory 19. Are temporarily stored alternately in the second area 19b at a constant transfer rate Rp (for example, 25 Mbps) in a time division manner.
[0131]
On the other hand, the track buffer memory 19 sets the transfer rates Ra and Rb of the first and second information signals A and B based on the compression rate at the time of recording read from the control data, and the transfer rates Ra and Rb The first and second information signals A and B are transferred to the AV-ENDEC 20 side. Thereafter, the decoder in the AV-ENDEC 20 expands the first and second information signals A and B based on the respective compression rates and simultaneously reproduces both information signals A and B on the display 25 (FIG. 1). ing.
[0132]
Here, the operation of reproducing the two information signals A and B in a time division manner will be described with reference to FIGS. In FIG. 14, the transfer rates Ra and Rb of the first and second information signals A and B are shown at the same transfer rate for the sake of illustration, but they show the same tendency even when they are different. is there.
[0133]
First, in step S91, a reproduction flow is started.
[0134]
Next, in step S92, when the optical pickup 14 reproduces the management area 13c on the optical disc 13, reproduction information relating to the first and second information signals A and B recorded in advance in the first and second areas. And position information are acquired from the management area 13c.
[0135]
Next, in step S93, it is confirmed whether or not the optical pickup 14 has reached the first address area A1 (target position) in the first area 13a where the optical pickup 14 is to be reproduced on the optical disk 13. If the address area A1 (target position) has not been reached, step S93 is further continued. If the address area A1 (target position) has been reached, the process proceeds to the next step S94.
[0136]
Next, in step S94, the optical pickup 14 starts reproduction from the first address area A1 in the first area 13a, and the first information signal A is transferred to the first in the track buffer memory 19 at the transfer rate Rp. Is temporarily stored in the area 19a. At this time, the system controller 22 (FIG. 1) constantly monitors the EMPTY value and the FULL value of the first area 19a in the track buffer memory 19, and the first information signal is only in the first cycle. It is stored at the transfer rate Rp until A reaches the EMPTY value.
[0137]
Next, in step S95, it is asked whether or not the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the EMPTY value. If the EMPTY value has not been reached, the process proceeds to step S94. On the other hand, if the EMPTY value is reached, the process proceeds to the next step S96.
[0138]
Next, in step S96, when the first information signal A exceeds the EMPTY value, the first information signal A is read to the AV-ENDEC 20 (FIG. 1) side at the transfer rate Ra, so as shown in FIG. Between the EMPTY value and the FULL value, the transfer rate Rp at which the first information signal A is written to the first area 19a of the track buffer memory 19 and the first information signal A from the first area 19a to AV− The first information signal A is temporarily stored in the first area 19a while increasing at the gradient of the difference (Rp−Ra) of the transfer rate Ra read to the ENDEC 20 side.
[0139]
Next, in step S97, it is asked whether or not the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the FULL value. If the FULL value has not been reached, step S96 is performed. On the other hand, if the FULL value is reached, the process proceeds to the next step S98.
[0140]
Next, in step S98, since the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the FULL value, the optical pickup 14 moves the first area 13a on the optical disc 13 to the first area 13a. Among them, the reproduction in the first address area A1 is stopped. Here, after the reproduction of the first information signal A is stopped, the first information signal A stored in the first area 19a in the track buffer memory 19 is transferred to the AV-ENDEC 20 side at the transfer rate Ra. As is apparent from FIG. 14, this read operation may be completed before the period until reaching the EMPTY value is reached before the second address area A2 in the first area 13a starts to be reproduced.
[0141]
Next, in step S99, the optical pickup 14 moves to the first address area B1 in the second area 13b on the optical disc 13 in order to reproduce the second information signal B next. At this time, the seek time Tab for the optical pickup 14 to move from the first address area A1 in the first area 13a on the optical disk 13 to the first address area B1 in the second area 13b is 1.5 at the maximum. Within seconds.
[0142]
Next, in step S100, it is confirmed whether or not the optical pickup 14 has reached the address area B1 (target position) of the second area 13b on the optical disc 13. If the address area B1 (target position) is not reached, step S100 is further continued. If the address area B1 (target position) is reached, the process proceeds to the next step S101.
[0143]
Next, in step S101, the optical pickup 14 starts reproduction from the first address area B1 in the second area 13b, and transmits the second information signal B at the second transfer rate Rp in the track buffer memory 19. Is temporarily stored in the area 19b. At this time, the second information signal B is stored at the transfer rate Rp until the second information signal B reaches the EMPTY value only in the first cycle.
[0144]
Next, in step S102, it is asked whether or not the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the EMPTY value. If the EMPTY value has not been reached, the process proceeds to step S101. On the other hand, if the EMPTY value is reached, the process proceeds to the next step S103.
[0145]
Next, in step S103, when the second information signal B exceeds the EMPTY value, the second information signal B is read to the AV-ENDEC 20 side at the transfer rate Rb, so that the EMPTY value and the FULL as shown in FIG. Between the values, the transfer rate Rp at which the second information signal B is written to the second area 19b of the track buffer memory 19 and the second information signal B are read from the second area 19b to the AV-ENDEC 20 side. The second information signal B is temporarily stored in the second area 19b while increasing with the difference of the difference (Rp−Rb) in the transfer rate Rb.
[0146]
Next, in step S104, it is asked whether or not the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the FULL value. If the FULL value has not been reached, step S103 is executed. On the other hand, if the FULL value is reached, the process proceeds to the next step S105.
[0147]
Next, in step S105, since the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the FULL value, the optical pickup 14 moves the second area 13b on the optical disc 13 to the second area 13b. Playback in the address area B1 is stopped. Here, after the reproduction of the second information signal B is stopped, the second information signal B stored in the second area 19b in the track buffer memory 19 is transferred to the AV-ENDEC 20 side at the transfer rate Rb. As is apparent from FIG. 14, this read operation may be completed before the period until reaching the EMPTY value is reached before the second address area B2 in the second area 13b starts to be reproduced.
[0148]
Next, in step S106, the optical pickup 14 moves to the second address area A2 in the first area 13a on the optical disk 13 to be reproduced next. At this time, the seek time Tba for the optical pickup 14 to move from the first address area B1 in the second area 13b on the optical disk 13 to the second address area A2 in the first area 13a is 1.5 at the maximum. Within seconds.
[0149]
When the optical pickup 14 reaches the second area A2 in the first area 13a on the optical disc 13, the process returns to step S93 and repeats in the same manner, so that the first and second information signals A and B are obtained by the optical pickup 14. Can be reproduced alternately in time division in the order of address areas A1, B1, A2, B2, A3, B3,.
[0150]
Note that the flow for stopping all reproduction by the optical pickup 14 may be inquired after step 38 or after step 45, but the operation becomes complicated and is omitted here.
[0151]
Further, in the flow of time division reproduction of the two information signals A and B described above, the track buffer memory 19 reaches the EMPTY value from the empty state in the first first cycle. Between the FULL values, the first information signal A having the recording capacity Ya and the second information signal B having the recording capacity Yb are stored.
[0152]
In the flow of time division reproduction of the two information signals A and B described above, in order to maintain continuity during time division reproduction between the optical disc 13 and the track buffer memory 19 via one optical pickup 14, (Equation 9) or (Equation 19) described above is satisfied, and detailed description thereof is omitted here.
[0153]
<ApplyExample information signal communication device>
  FIG. 15 illustrates the present invention.AppliedIt is a block diagram for demonstrating the whole structure of an information signal communication apparatus.
For convenience of explanation, the same constituent members as those shown above will be described with appropriate reference numerals, and new constituent members will be given new reference numerals.ApplyIn the example, the description will focus on differences from the first embodiment.
[0154]
  The information signal recording / reproducing apparatus or the information signal reproducing apparatus 10 of the first embodiment described above is an optical disc player that compresses and expands a video signal and an audio signal, whereas the present invention shown in FIG.AppliedThe information signal communication apparatus 30 has a configuration of an optical disk drive having no compression / decompression block, and first and second areas (first and second buffers) in the track buffer memory 19 provided in the optical disk drive. The ATAPI interface 31 for communication connection with the outside is provided on the output side of the memory), and the host 32 and the AV-ENDEC (audio / video / encoder / decoder) 20 compression / decompression as a host computer outside The other points are the same as in the first embodiment, except that the blocks are connected. The optical disk drive described above is obtained by removing the AV-ENDEC 20, the buffer memory 21, and the key 23 from the apparatus 10 of the first embodiment.
[0155]
More specifically, there is an I / F block in the ATAPI interface 31, and there is an I / F block in the I / F portion of the AV-ENDEC 20, which is connected by the ATAPI interface 31, and is used for commands of the computer peripheral disk storage device. Mount Fuji Mt. The optical disk drive is controlled based on the Fuji command system.
[0156]
That is, in the first embodiment described above, the first and second information signals A and B input at the time of recording by the optical disc player 10 are analyzed to determine the respective transfer rates Ra and Rb. The transfer rates Ra and Rb of the first and second information signals A and B are determined by calculation from the recording state of the optical disc 13 during reproduction by the player 10, but in the second embodiment of the present invention, the optical disc drive is used. Since there is no key input unit or a decoding unit for control data from the optical disc 13, the transfer rates Ra and Rb of the first and second information signals A and B to be recorded at the time of recording are set to I in the ATAPI interface 31 from the host side. Input via / F block.
[0157]
At this time, in the case of a recording process, for example, when a video signal with a transfer rate of 2 Mbps is input, the host 32 transfers the contents to the I / F unit of the AV-ENDEC 20 and records a recording command and a recording start address as described below. In addition to the above information, the transfer rate flag of the signal is transferred to the optical disc drive. This is decoded by the signal processing portion of the optical disk drive, and the recording process is performed as described above according to the type.
[0158]
Next, in the case of reproduction processing, for example, a video signal recorded at a predetermined address on the optical disc 13 is reproduced in accordance with the reproduction command based on the Mount Fuji command system as described above. The host 32 interprets this data and calculates the transfer rate as described above. Then, for example, the host 32 transfers the content to the I / F unit in the AV-ENDEC 20 to indicate that the video signal has a transfer rate of 2 Mbps, and in addition to the playback command as described below, the transfer rate flag of the signal Forward. This is decoded in the signal processing portion, and reproduction processing is performed as described above according to the transfer rate.
[0159]
In addition, although the TAPI interface 31 that performs communication connection with the outside has been described as an example of performing communication, standards such as IEEE 1394 may be used, and radio waves and light other than communication using such cables are used. Communication may be used. The signal to be recorded / reproduced is mainly video data, but it goes without saying that it may be audio or music data, a still image, a sub-picture, or a decoded signal obtained by decoding them. In other words, the transfer rate referred to here indicates a data transfer rate in a range that does not hold as information unless data is transferred at a transfer rate within a certain range on average. In the present embodiment, the description is focused on the optical disk 13. However, the present invention can also be applied to an apparatus that has a plurality of disks and a plurality of heads and performs recording and reproduction alternately, such as a magnetic disk apparatus. The disk is assumed to be a spiral continuous track. However, the present invention can also be applied to a case where a plurality of concentric tracks are similarly used as in a magnetic disk device. In this case, a track kick operation is performed in continuous recording and reproduction, but this operation can be similarly applied if considered as a seek time. Further, the recording / reproducing procedure and the contents of display are merely examples, and are not limited to this range.
[0160]
Further, here, the information signal transfer rate is described mainly with respect to continuous information signals such as video and audio, but computer data that does not make sense unless processed within a predetermined time, It belongs to continuous data and generally includes a variable transfer rate and a fixed transfer rate that change every moment on the time axis depending on image quality.
[0161]
【The invention's effect】
  As described above in detail, the information signal recording / reproducing apparatus and the information signal reproducing apparatus according to the present invention.In placeAccording to2Two information signals can be recorded and / or reproduced well while maintaining continuity during time-division recording and / or reproduction.
[Brief description of the drawings]
FIG. 1 is a block diagram for explaining an overall configuration of an information signal recording / reproducing apparatus according to a first embodiment of the present invention or an information signal reproducing apparatus;
FIG. 2 shows the information signal recording / reproducing apparatus or information signal reproducing apparatus according to the first embodiment of the present invention, the first and second areas on the optical disc and the first and second areas in the track buffer memory. FIG. 6 is a diagram schematically showing a state in which the first and second information signals are recorded and / or reproduced in a time division manner by one optical pickup.
FIG. 3 is a diagram showing addresses of first and second areas (data areas) and addresses of management areas on an optical disc.
FIG. 4 is a diagram showing a state in which a state of an empty area on an optical disc is displayed on a display when one information signal is recorded on the optical disc.
FIGS. 5A and 5B are views showing a state in which two information signals are recorded on an optical disc in a time-sharing manner or when a free space state on the optical disc is displayed on a display when the information signal is recorded or reproduced. is there.
FIG. 6 is a diagram schematically showing a mode in which first and second information signals are recorded on an optical disc in a time-sharing manner.
FIG. 7 is a flowchart showing a state in which first and second information signals are recorded on an optical disc in a time-sharing manner.
FIG. 8 is a timing chart showing a state in which the first and second information signals are recorded on the optical disc in a time-sharing manner.
FIG. 9 is a diagram schematically showing a mode in which the first and second information signals are recorded and reproduced on an optical disc in a time-sharing manner.
FIG. 10 is a flowchart showing a state in which the first and second information signals are recorded and reproduced on an optical disc in a time-sharing manner.
FIG. 11 is a timing chart showing a state in which the first and second information signals are recorded and reproduced on an optical disc in a time-sharing manner.
FIG. 12 is a diagram schematically showing a form in which first and second information signals are reproduced from an optical disc in a time division manner.
FIG. 13 is a flowchart showing a state in which the first and second information signals are reproduced from the optical disc in a time division manner.
FIG. 14 is a timing chart showing a state in which the first and second information signals are reproduced from the optical disc by time division.
FIG. 15 shows the present invention.AppliedIt is a block diagram for demonstrating the whole structure of an information signal communication apparatus.
[Explanation of symbols]
10: Information signal recording and / or reproducing device,
13: Information signal recording medium (optical disc),
13a ... 1st area | region, 13b ... 1st area | region, 13c ... management area | region,
14 ... Head (optical pickup),
19: Track buffer memory,
19a: first buffer memory (first area in the track buffer memory),
19b ... second buffer memory (second area in the track buffer memory),
20: Audio video / encoder / decoder (AV-ENDEC),
30. Information signal communication device,
31 ... ATAPI interface.

Claims (3)

An information signal recording medium provided with first and second areas for recording first and second information signals respectively, and a management area for recording management information indicating addresses in the first and second areas Means for rotating;
One buffer memory for temporarily storing the first and second information signals input at the first and second transfer rates;
Said movably provided with respect to the information signal recording medium, before Symbol said first read by time division from the buffer memory, the second information signal first, fast transfer transmission rate than the second transfer rate And at least one head for time-division recording on the first and second areas on the information signal recording medium,
Absorbing the first by the one head, and the transfer rate to the second information signal, the first previously entered Kiba Ffamemori, the difference between the transfer rate of the second information signal prior fangs Ffamemori An information signal recording / reproducing apparatus configured as described above ,
Transfer rates of first and second information signals transferred from the buffer memory to the head ... Rp,
The selected transfer rate Ra for inputting the first information signal to the buffer memory, Ra,
The selected transfer rate... Rb for inputting the second information signal to the buffer memory.
Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,
Corresponding to the values of the transfer rate Ra and the transfer rate Rb, the necessary area of the buffer memory is secured, and the information unit amount to transfer the first information signal from the buffer memory to the head, Ya, Information unit amount... Yb for transferring the second information signal from the buffer memory to the head.
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
An information signal recording / reproducing apparatus , wherein the first and second information signals are recorded on the information signal recording medium while satisfying the following relational expression: A first area in which one of the first and second information signals is recorded in advance, a second area in which the other information signal is recorded, and addresses in the first and second areas Means for rotating an information signal recording medium provided with a management area for recording management information indicating:
The information signal recording medium body or found one information signal reproduced temporarily stores and outputs at a first transfer rate, temporarily storing said other information signal input at the second transfer rate One buffer memory to
Said information signal movably provided with respect to the recording medium, before Symbol information signal recording medium body or playback from the one of said information signal first, second transfer rate from fast transfer in transmission rate before Fang Ffamemori comprising at least an operation for transferring, and one of the head and the other information signal input before Kiba Ffamemori before Kiten feed rate performed by time division operation and to be recorded on said information signal recording medium body,
Before Kihe Tsu first by de, the transfer rate to the second information signal, before the first of input and output from the fang Ffamemori, the difference between the transfer rate of the second information signal prior fangs Ffamemori An information signal recording / reproducing apparatus configured to absorb ,
Transfer rates of first and second information signals input / output to / from the buffer memory by the head... Rp,
The selected transfer rate... Ra, in which the information signal to be recorded of the first and second information signals is input to the buffer memory.
The transfer rate for outputting the information signal to be reproduced from the first and second information signals from the buffer memory ... Rb,
Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,
Corresponding to the values of the transfer rate Ra and the transfer rate Rb, the necessary area of the buffer memory is secured, and the information unit amount for transferring the information signal to be recorded from the buffer memory to the head. Ya , Yb, an information unit amount for transferring the information signal to be reproduced from the head to the buffer memory,
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
An information signal recording / reproducing apparatus that records and reproduces the first and second information signals on the information signal recording medium while satisfying the following relational expression: Means for rotating the information signal recording medium having the first and second information signals recorded respectively at the first and second positions ;
Before the first on Kijo report signal recording medium, said divided and reproduced when the second position first, and a single buffer memory for temporarily storing the second information signal,
The first and second information signals are output at first and second transfer rates , respectively , and the first and second information signals are reproduced in a time-sharing manner from the first and second positions on the information signal recording medium. said information signal first, and transfers the time-division from one head at a speed transfer transmission rate than the second transfer rate before Kiba Ffamemori,
Transfer rates of the first and second information signals transferred from the head to the buffer memory ... Rp,
Transfer rate for outputting the first information signal from the buffer memory ... Ra,
Transfer rate for outputting the second information signal from the buffer memory ... Rb,
Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,
Corresponding to the values of the transfer rate Ra and the transfer rate Rb, the necessary area of the buffer memory is secured, and the information unit amount for transferring the first information signal from the head to the buffer memory ... Ya, Information unit amount to transfer the second information signal from the head to the buffer memory... Yb
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
An information signal reproducing apparatus for reproducing the first and second information signals from the information signal recording medium satisfying the following relational expression:

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