JP2002319234A - Information signal reproducing method, information signal recording method, and information signal recording and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb differences in the transfer speeds of 1st and 2nd information signals between an information signal recording medium and a buffer memory. SOLUTION: When the differences between the transfer speeds to the 1st and 2nd information signals by one pickup head to an information signal recording medium and the transfer speeds of the 1st and 2nd information signals in a buffer memory are absorbed, the 1st and 2nd information signals are reproduced, so that (Ya+Yb)>=Rp×(Ra+Rb)×(Tab+Tba)/(Rp-Ra-Rb) is satisfied, where respectively Rp is the transfer rate to the 1st and 2nd information signals by one pickup head, Ra the transfer rate of the 1st information signal, Rb the transfer rate of the 2nd information signal, Ya the recording capacity of the 1st information signal, Yb the recording capacity of the 2nd information signal, Tab the seek time of the movement of the pickup head from a 1st area to a 2nd area on the information signal recording medium, and Tba the seek time of the movement of the pickup head from the 2nd area to the 1st area on the information signal recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to first and second video information such as two movies and two pieces of audio information such as music.
Signal reproduction method, information signal recording method, and information signal recording method for recording and / or reproducing the information signal on a disk-shaped recording medium such as optical or magnetic in a time-division manner by one pickup (or head) via a buffer memory It relates to a reproduction method.

[0002]

2. Description of the Related Art Conventionally, an optical disk apparatus (for example, a DVD player) to which an optical disk is applied as an information signal recording medium.
In such cases, information signals such as video information such as movies and audio information such as music are compressed and recorded on an optical disk by an optical pickup, and a compressed information signal read from the optical disk by the optical pickup during reproduction is expanded. Also, in a device to which this kind of compression / expansion technology is applied, for example, a buffer memory of about 4 Mbits is provided inside the device, and a signal having a transfer rate of 10.08 Mbps read from an optical disk is transmitted at a rate of 10.08 Mbps. When converting a signal having a low variable transfer rate into a transfer rate, the difference in transfer rate is absorbed by the buffer memory.

Further, Japanese Patent Application Laid-Open No. Hei 10-92158 discloses that when data of a plurality of stories and scenes is recorded on a recording medium, the physical movement distance of a pickup at the time of reproduction is small, and the reproduction device is interrupted. There is disclosed a technical idea that can suppress the occurrence of disturbance. Here, it is also considered to record, for example, a multi-angle scene in which the same event that proceeds simultaneously from a plurality of angles is recorded on an optical disc, and a pickup on the disc is used to realize the function of the multi-angle scene and the like. The time during which the data cannot be reproduced while moving the position 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 intermittently recorded on the optical disc is selectively reproduced while jumping the pickup. The relationship between the seek time of the pickup and the capacity of the buffer memory required to absorb the continuity of the signal in the buffer memory is disclosed.

[0004] The applicant of the present invention has disclosed Japanese Patent Application Laid-Open No. Hei 6-13969.
Japanese Patent Application Laid-Open No. 6-26,199 proposes a method of absorbing a difference in transfer rate with a buffer memory and recording and reproducing two or more signals from one disk. That is, in the recording / reproducing apparatus disclosed in JP-A-6-139696, digital data having a first transfer rate generated by compressing the information amount of a recording signal to be recorded / reproduced is converted to a predetermined modulation rate. A recording operation of converting into digital data for recording / reproduction having a second transfer rate higher than the above-mentioned first transfer rate and modulated on a recording medium, and recording the data on a recording medium; The reproducing operation of converting the digital data for recording and reproduction into digital data having the first transfer rate and then converting the digital data to a reproduction signal and outputting the reproduced signal is performed by an information signal for recording on a recording medium and a reproduction operation performed on the recording medium. This is performed in a time-division manner so that the information signal becomes a simultaneous signal.

[0005]

In the recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. Hei 6-139696, the compression ratio of one digital audio signal is 1/5.
Is applied so that recording and reproducing operations can be performed satisfactorily without play time. In recent years, information signal recording media such as optical discs have been increased in density, capacity, and digitalization. Accordingly, it is required to record two information signals in different areas of the information signal recording medium and to record and / or reproduce the two information signals alternately by one optical pickup head on the information signal recording medium. The present invention is an improvement over the prior art to satisfy the above requirements.

[0006]

The present invention has been made in view of the above problems, and provides an information signal reproducing method, an information signal recording method, and an information signal recording / reproducing method having the following configurations. (1) rotating the information signal recording medium on which the first and second information signals are recorded at the first and second positions, respectively, and performing time division from the first and second positions on the information signal recording medium; Temporarily storing the reproduced first and second information signals in a buffer memory, and outputting the first and second information signals at first and second transfer rates, respectively; The first and second information signals reproduced in a time-division manner from the first and second positions on the information signal recording medium are transferred from one head to the buffer at a transfer rate faster than the first and second transfer rates. Transferring the data to the memory in a time-division manner; a transfer rate of the head to the first and second information signals... Rp; a transfer rate of the first information signal.
a, the transfer rate of the second information signal ... Rb, the first information signal
The amount of reproduction information unit of the information signal... Ya, the amount of reproduction information unit of the second information signal... Yb, and the time required for the head to move from the first position to the second position on the information signal recording medium. Tab, time required for the head to move from the second position to the first position on the information signal recording medium ... Tba
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Ta
reproducing the first and second information signals from the information signal recording medium while satisfying a relational expression of (b + Tba) / (Rp-Ra-Rb). (2) rotating an information signal recording medium for recording first and second information signals, respectively, and temporarily storing the first and second information signals input at the first and second transfer rates, respectively; Storing the data in a buffer memory; and reading the first and second data read out from the buffer memory in a time-division manner.
Recording the information signal from one head at first and second positions on the information signal recording medium in a time-division manner at a transfer rate higher than the first and second transfer rates; , Transfer rate to the second information signal ... R
p, transfer rate of the first information signal... Ra, the second
The transfer rate of the information signal Rb, the recording information unit amount of the first information signal Ya, the recording information unit amount of the second information signal Yb, Time required to move from the position to the second position ... Ta
b, the time required for the head to move from the second position to the first position on the information signal recording medium: Tba, (Y
a + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tb
a) recording the first and second information signals on the information signal recording medium while satisfying a relational expression of (Rp-Ra-Rb). (3) rotating an information signal recording medium for recording / reproducing which records any one of the first and second information signals and reproduces the other, from a first position on the information signal recording medium; One of the reproduced information signals is temporarily stored in a buffer memory and output at a first transfer rate, and the other information signal input at a second transfer rate is temporarily stored in the buffer memory. Transferring one information signal reproduced from a first position on the information signal recording medium to the buffer memory at a constant transfer rate higher than the first and second transfer rates; and Recording the other information signal input to the information signal at the second position on the information signal recording medium at the transfer rate in a time-division manner; and performing first and second information processing by the head. Rp, transfer rate of the first information signal ... Ra, transfer rate of the second information signal ... Rb, recording / reproducing information unit amount of the first information signal ... Ya, the Recording / reproducing information unit amount of the information signal of No. 2 Yb, time required for the head to move from the first position to the second position on the information signal recording medium Ta
b, the time required for the head to move from the second position to the first position on the information signal recording medium: Tba, (Y
a + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tb
a) recording and reproducing the first and second information signals on the information signal recording medium while satisfying a relational expression of (a) / (Rp-Ra-Rb).

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An information signal reproducing apparatus, an information signal recording apparatus, an information signal recording / reproducing apparatus, an information signal communication apparatus and an information signal reproducing medium according to the present invention will be described below with reference to FIGS. The first embodiment and the second embodiment will be described in detail with reference to FIG.

<First Embodiment> FIG. 1 shows an information signal recording and / or
FIG. 3 is a block diagram for describing an overall configuration of a playback device.

As shown in FIG. 1, in an information signal recording and / or reproducing apparatus 10A, DVD-ROM, DVD-RAM, DVD-RW, DV
The present invention can be applied to an optical disk such as D + RW and a magnetic disk such as a hard disk and a floppy (registered trademark) disk. In the following embodiment, a case where an optical disk is applied as a medium will be described.

As shown in FIG. 1, in an information signal recording and / or reproducing apparatus (optical disk player) 10, an optical disk (information signal recording medium) 13 is rotatable on a turntable 12 attached to a shaft of a spindle motor 11. Is provided.

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 is capable of reproducing data from the read-only optical disk 13 and capable of recording and reproducing data from the recording / reproducing optical disk 13. Is used as a light source, and a laser spot is irradiated onto the optical disk 13 by a collimator lens, an objective lens, or the like. At this time, the semiconductor laser is driven by a laser drive circuit. When recording an information signal such as an audio signal or a video signal, the input information signal is input to the laser drive circuit after its waveform is corrected by a waveform correction circuit. You.

A command to start recording and / or reproduction by a selection operation of a plurality of keys 23 is transmitted to the system controller 2.
The signal read out from the optical pick 14 is generated by the preamplifier 16 to generate a reproduction signal and a servo signal, and the optical pickup 14 controls the servo circuit 17 by the servo circuit 17. By processing the signals, focusing and tracking signals are generated for the tracks on the optical disk 13, and a driver circuit 15 drives an actuator in the optical pickup 14 to perform one round of servo control of the optical pickup 14, Based on the control data on the optical disk 13, the optical pickup 14 is moved in the radial direction of the optical disk 13 by a feed motor so as to reproduce a sector of a target track on the optical disk 13.

A read signal read from the optical pickup 14 with one correction block as the minimum unit is used to optimize the frequency characteristic of the read signal by the preamplifier 16 using an equalizer, to apply a PLL, and to generate a PLL bit clock, The system controller 22 has an A / D converter for measuring and measuring the jitter value based on the comparison of the time axis of the data, and the waveform correction circuit at the time of recording is changed according to this value.

The signal is converted into a digital signal by a signal processing circuit 18 and, for example, synchronization detection is performed.
3 is decoded into NRZI data from the EFM + signal, and error correction is performed in units of correction blocks to obtain a sector address signal and first and second information signals described later. Since these first and second information signals are signals compressed at a variable transfer rate, they are stored in a track buffer memory 19 using a 64-Mbit DRAM serving as a temporary storage unit. And temporarily absorbs the time axis of the variable transfer rate of the first and second information signals. Track / buffer memory 19
Are read from an audio / video / encoder / decoder (hereinafter referred to as AV-ENDEC) 20.
, The audio signal and the video signal are decompressed and separated from the first and second information signals compressed based on MPEG2, and the audio signal and the video signal are respectively separated by a D / A converter (not shown). Output as audio and video signals.

In the AV-ENDEC 20, the speed of decompression is determined in accordance with a recording mode to be described later based on the control data written on the optical disk 13, and the decompression is performed in accordance therewith, and the buffer memory 21 is connected. I have.

Further, a speed signal of the optical disk 13 generated by the PLL of the preamplifier 16 is sent to the servo circuit 17, and the rotation of the optical disk 13 at CLV is controlled by the speed signal. In addition, a rotation position signal of the hall element of the spindle motor 11 is fed back to the servo circuit 17, and a speed signal generated from the signal is used to perform FG control of constant rotation. The whole controller between the LSIs is controlled by the system controller 22.

Also, in order to set the resolution of an image to be recorded or a high-speed scene such as a car race, or to give priority to the recording time, a key input or external control data is supplied to a microcomputer in the system controller 22. Has a switching terminal, which allows the recording time to be changed, and allows an external user to select the setting.

As will be described later, the user can reproduce a video signal or the like recorded on the optical disc 13,
In addition to recording the video signal, the video signal in a different area on the optical disc 13 can be reproduced while the video signal currently being recorded is recorded as it is. Further, it is configured such that video signals and the like in different areas on the optical disc 13 can be recorded while the video signal that is currently being reproduced is being reproduced as it is. Similarly, it is configured to be able to reproduce video signals and the like in different areas of the optical disc 13 while the video signal that is currently being reproduced is being reproduced as it is. Similarly, it is configured such that video signals in different areas on the optical disk 13 can be recorded while the video signal currently being recorded is recorded as it is. As a result, the user can enjoy functions such as post-recording recording and back-program recording.

In the information signal recording and / or reproducing apparatus 10A, two areas
When recording and / or reproducing the first and second information signals based on video information of two movies and the like and audio information of two musics and the like by one optical pickup 14 through the track buffer memory 19 in a time division manner. Will be described with reference to FIG. It should be noted that it is of course possible to record and / or reproduce only one of the first and second information signals by one optical pickup 14 via the track buffer memory 19. Omitted.

FIG. 2 shows an information signal recording and / or reproducing apparatus in which the first and second areas on the optical disk and the first and second areas on the track buffer memory are first and second areas. FIG. 4 is a diagram schematically showing a state in which two information signals are recorded and / or reproduced in a time-division manner by one optical pickup. In FIG. 2, illustration of a preamplifier and a signal processing circuit is omitted for easy understanding.

As shown in FIG. 2, a first area 13a on the optical disk 13 is an area for recording a first information signal A having a recording capacity Ya as a minimum unit for recording and reproduction (for example, an address A1 area in FIG. 4). In the second area 13b, the recording capacity Yb is set to the minimum unit for recording and reproduction (for example, the address B in FIG. 4).
It is assumed that this is an area for recording the second information signal B (one area). At this time, the first information signal A and the second information signal B may be either information that is related to each other or information that is completely unrelated.

The first area 19a on the track buffer memory 19 is an area for temporarily storing the first information signal A, and the second area 19b is for temporarily storing the second information signal B. It is assumed that the area is a storage area.

Also, one optical pickup 14 has a first
The information signal A and the second information signal B are transferred between the optical disk 13 and the track buffer memory 19 in a time-division manner.
The transfer rate Rp to the second information signals A and B is set to be constant, and the constant transfer rate Rp is, for example, 25M.
bps. The transfer rate Rp of the one optical pickup 14 to the first and second information signals A and B is faster than the transfer rates Ra and Rb of the first and second information signals A and B described later. Is set.

The track / buffer memory 19 and A
V-ENDEC 20 and the first and second information signals A,
B. At this time, the transfer rate of the first information signal A is set to a transfer rate Ra, and the transfer rate of the second information signal B is set to a transfer rate Rb. The present invention is characterized in that the first information signal A and the second information signal B can be recorded and / or reproduced continuously and simultaneously as described later.

Here, the transfer rates Ra and Rb of the first and second information signals A and B can be selected by giving priority to the image quality.
The transfer rate is one of s and 2 Mbps.
. A mode with a recording rate of 2 Mbps at a transfer rate for high image quality, for example, 8 Mbps,. A mode with a recording rate of 4 hours, for example, 4 Mbps at a transfer rate for slightly higher image quality,. Three types of modes, for example, a transfer rate for normal image quality and a recording time of 8 hours at 2 Mbps, for example, are prepared.
At the time of recording on the data, the transfer rate R of the first and second information signals A and B is designated by specifying the mode by a key input by the user.
While a and Rb are set, the compression rate at the time of recording is read from the control data of the first and second information signals A and B in the reproduction signal during reproduction from the optical disk 13, and the first and second compression rates are read according to these values. It is assumed that transfer rates Ra and Rb of information signals A and B of No. 2 are set.

The system controller 22 shown in FIG. 1 has a track buffer memory 19 of 64 Mbits.
In the first and second areas 19a and 19b, the values of the transfer rates Ra and Rb of the first and second information signals A and B (= Ra: R
In addition to the division setting according to b), each area 19a, 19
In b, an EMPTY value indicating that the storage capacity is empty and a FULL value indicating that the storage capacity is full are set according to the values of the transfer rates Ra and Rb of the first and second information signals A and B. I do. Then, the system controller 22 constantly monitors the storage remaining amount between the EMPTY value and the FULL value of each of the areas 19a and 19b in the track buffer memory 19.

As a different embodiment, as described above, the first and second areas 19a, 19a in the track / buffer memory 19 depend on the values of the transfer rates Ra, Rb of the first and second information signals A, B. 19b is divided not according to the recording mode or the reproduction mode. For example, 2
Assuming that the two information signals A and B have the same transfer rate,
One information signal A (B) is reproduced, and the other information signal B
In the case of recording (A), the reproduction signal does not cause a serious problem even if the continuity of reproduction is slightly impaired during reproduction. However, if the recording signal cannot be recorded continuously, it becomes a fatal defect. For example, the recording area occupies a larger area in the track buffer memory 19. This processing is performed at the time when the system controller 22 inputs a recording or reproduction instruction, as described above, when the data in the track buffer memory 19 is confirmed, and when it is confirmed that there is no intermediate data being reproduced or recorded. Do with.

Next, the first and second areas 19a, 19b in the track / buffer memory 19 are transferred to the transfer rates Ra, R
an information signal reproducing apparatus which applies a mode of reproducing the first and second information signals A and B from the optical disc 13 under the condition of being divided and set according to the value of b; B
And an information signal recording apparatus to which the first and second information signals A and B are reproduced from the optical disc 13 and the other is reproduced.
The information signal recording / reproducing apparatus to which the recording mode is applied will be described in order with reference to FIGS.

<Information Signal Reproducing Apparatus> FIG. 3 is a view schematically showing an information signal reproducing apparatus to which an embodiment for reproducing the first and second information signals from an optical disk is applied. FIG. FIG. 5 shows an address of the second area, FIG. 5 is a flowchart showing a state in which the first and second information signals are reproduced from the optical disk, and FIG. 6 is a state in which the first and second information signals are reproduced from the optical disk. FIG.

As shown in FIG. 3, the optical disk 13 is formed for reproduction only, and a first information signal A having a recording capacity Ya is provided on the optical disk 13 in a first area 13a.
And a second information signal B having a recording capacity Yb is previously recorded in the second area 13b.

Further, as shown in FIG.
The upper first area 13a is divided into a plurality of areas within a range in which a seek time described later can be kept, and addresses A1, A2, A3,...
Are recorded separately. Similarly, the second area 13b on the optical disk 13 is also divided into a plurality of areas within a range in which a seek time described later can be maintained, and addresses B1, B2, B3,... Each is divided and recorded. At this time, between the first address area A1 in the first area 13a to be reproduced first and the first address area B1 in the second area 13b to be reproduced next, for example, 1. The seek time of the optical pickup 14 moving between the first information signal A and the second information signal B to be reproduced next is generally set to a range in which the optical pickup 14 can move within 5 seconds. At most 1.5 seconds.

During reproduction of the optical disk 13, the optical pickup 14 moves to a predetermined reproduction track, waits for a start sector, and records the first and second recorded signals in the reproduction signal.
The compression rate at the time of recording is read from the control data of the information signals A and B, and the signal processing circuit 1
8 (FIG. 1), the storage capacity areas of the first area 19a and the second area 19b in the 64 Mb track buffer memory 19 are separated, and the EMPTY value and the FULL value of each area 19a, 19b are separated. Are set respectively.

Here, the optical pickup 14 converts the first information signal A recorded on the first area 13a on the optical disc 13 and the second information signal B recorded on the second area 13b. The first information signal A obtained by the reproduction is alternately reproduced in a time-division manner, the first information signal A obtained by the reproduction is stored in the first area 19a in the track buffer memory 19, and the second information signal B obtained by the reproduction is stored by the track buffer. A constant transfer rate Rp (for example, 25 Mb) is stored in the second area 19 b in the memory 19 in a time-division manner.
ps) to temporarily store them alternately. At this time, the transfer rate of the optical pickup 14 to the first and second information signals A and B is the same as the output rate of the first and second information signals A and B temporarily stored in the track buffer memory 19. 1, set faster than the second transfer rate.

On the other hand, the track / buffer memory 19
The transfer rate R of the first and second information signals A and B is determined based on the compression rate at the time of recording read from the control data.
a and Rb are set, and the first and second information signals A and B are transferred to the AV-ENDEC 20 at the transfer rates Ra and Rb. 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 the two information signals A and B using a display or a speaker (not shown). I have.

Here, the operation of the information signal reproducing apparatus will be described with reference to FIGS. It should be noted that in FIG.
The transfer rates Ra and Rb of the 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.

First, in step S31, a reproduction flow is started.

Next, in step S32, the first position where the optical pickup 14 is to be played back on the optical disk 13 is determined.
It is confirmed whether or not the first address area A1 (target position) has been reached in the area 13a. If the address area A1 (target position) has not been reached, this step S
32, the process proceeds to the next step S33 when the address area A1 (target position) is reached.

Next, in step S33, the optical pickup 14 moves the first address area A in the first area 13a.
1 to start reproduction and transfer the first information signal A to the transfer rate R
p indicates the first area 19 in the track buffer memory 19
a is temporarily stored. 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 only in the first cycle. A is stored at the transfer rate Rp until A reaches the EMPTY value.

Next, in step S34, the first data stored in the first area 19a in the track buffer memory 19 is stored.
Question whether the information signal A of the E has reached the EMPTY value.
If the MPTY value has not been reached, the operation of step S33 is continued, and if the EMPTY value has been reached, the process proceeds to the next step S35.

Next, in step S35, if the first information signal A exceeds the EMPTY value, the first information signal A is read out to the AV-ENDEC 20 at the transfer rate Ra, and as shown in FIG. The first information signal A is between the track buffer memory 1 and the FULL value.
9, the transfer rate Rp written to the first area 19a.
And the first information signal A is transmitted from the first area 19a to the AV-E
The first information signal A increases while increasing with the slope of the difference (Rp-Ra) of the transfer rate Ra read to the NDEC 20 side.
Is temporarily stored in the first area 19a.

Next, in step S36, it is asked whether the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the FULL value.
If the value has not reached the UL value, the process returns to step S35, and if the value has reached the FULL value, the process proceeds to the next step S37.

Next, in step S37, the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the FULL value. 1 in the area 13a of
The reproduction in the address area A1 is stopped. here,
From the stage where 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 continuously read to the AV-ENDEC 20 at the transfer rate Ra. However, in this read operation, as is clear from FIG. 6, the period until the EMPTY value is reached is the second address area A2 in the first area 13a.
May be completed before the reproduction is started.

Next, in step S38, the optical pickup 14 causes the second area 1 on the optical disc 13 to be reproduced next.
Move to the first address area B1 in 3b. 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 disc 13 to the first address area B1 in the second area 13b is 1.5 at the maximum. Within seconds.

Next, in step S39, it is checked whether or not the optical pickup 14 has reached the address area B1 (target position) of the second area 13b on the optical disk 13. If the address area B1 (target position) has not been reached, step S39 is continued and the address area B1 is reached.
When it reaches 1 (target position), the process proceeds to the next step S40.

Next, in step S40, the optical pickup 14 starts reproduction from the first address area B1 in the second area 13b on the optical disk 13 and tracks the second information signal B at the transfer rate Rp. Buffer memory 19
Is temporarily stored in the second area 19b. On this occasion,
The second information signal B is EMP only in the first cycle.
The data is stored at the transfer rate Rp up to the TY value.

Next, in a step S41, the second data stored in the second area 19b in the track buffer memory 19 is stored.
Of the information signal B has reached the EMPTY value.
If the MPTY value has not been reached, the operation of step S40 is continued, and if the EMPTY value has been reached, the process proceeds to the next step S42.

Next, in step S42, if the second information signal B exceeds the EMPTY value, the second information signal B is read out to the AV-ENDEC 20 at the transfer rate Rb, so that as shown in FIG. The second information signal B is between the track buffer memory 1 and the FULL value.
9, the transfer rate Rp written to the second area 19b.
And the second information signal B is transmitted from the second area 19b to the AV-E
The second information signal B increases with the slope of the difference (Rp-Rb) of the transfer rate Rb read to the NDEC 20 side.
Is temporarily stored in the second area 19b.

Next, in step S43, 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.
When the value has not reached the UL value, the process returns to step S42, and when the value has reached the FULL value, the process proceeds to the next step S44.

Next, in step S44, 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 The reproduction in the address area B1 of the area 13b is stopped. Here, from the stage where 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.
In this read operation, as apparent from FIG. 6, the period until the EMPTY value is reached is the second time.
The processing may be completed before the reproduction of the second address area B2 in the area 13b is started.

Next, in step S45, the first area 1 on the optical disk 13 to be reproduced next by the optical pickup 14 is read.
Move to the second address area A2 in 3a. 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 disc 13 to the second address area A2 in the first area 13a is 1.5 at the maximum. Within seconds. Then, the optical pickup 14 is moved to the first area 13 a on the optical disc 13.
When the second area A2 is reached, the process returns to step S32 and is repeated in the same manner. If the first and second information signals A and B are transmitted to the address areas A1, B1,
A2, B2, A3, B3,... Can be successively and alternately reproduced in a time-division manner.

It should be noted that the flow for stopping all reproduction by the optical pickup 14 may be inquired after step 37 or after step 44, but since the operation becomes complicated, it is omitted here.

In the above-mentioned reproduction flow, the track / buffer memory 19 reaches the EMPTY value from the empty state in the first cycle, but the recording capacity between the EMPTY value and the FULL value in the second and subsequent cycles. Ya
A first information signal A having a recording capacity Yb and a second information signal A having a recording capacity Yb
Will be stored.

Now, how the EMPTY value, FULL value, and the like in the first and second areas 19a and 19b in the track buffer memory 19 are set when the optical disk 13 is reproduced will be described.

Transfer rate to first and second information signals A and B by optical pickup 14: RpMbps Transfer rate of 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) Optical pickup 14 is located on first area 1 on optical disk 13
Seek time required to move from 3a to second area 13b ...
Tba (s) The optical pickup 14 is in the second area 1 on the optical disc 13
Seek time required to move from 3b to the first area 13a ...
Assuming that Tba (s), this relationship is described in (9) below, which is a main part of the present invention.
Expressions (11) to (11) must be satisfied.

The seek time Tba (Tba) here means that the reproduction is stopped at the reproduction end position of the information signal A (B) in the area 13a (13b) on the optical disc 13, and the next area 1
3b (13a), the optical pickup 14 moves to the next area 13b (13a), and the optical pickup 14 confirms the address on the target track in the area 13b (13a) for reproduction. It shows the time obtained by adding the time from the end of the preparation work to the start of reproduction of the next information signal B (A).

Also, the first and second information signals A,
B in the track buffer memory 19 for the transfer rate Rp for storing B in the track buffer memory 19.
The first information signal A from the area 19a of AV-ENDEC.
20 and the average transfer rate Rb read out to the track 20
The sum with the average transfer rate Rb for reading the second information signal B from the second area 19b of the buffer memory 19 to the AV-ENDEC 20 side must not exceed this. When this is represented by an equation, Rp> Ra + Rb (1 equation) is obtained.

The reproduction time Ta (s) for the optical pickup 14 to reproduce the first information signal A is: Ta = Ya / Rp (2) The reproduction for the optical pickup 14 to reproduce the second information signal B is as follows. The time Tb (s) is as follows: Tb = Yb / Rp (Equation 3)

The transfer rate Rp of the first and second information signals A and B by the optical pickup 14, and the transfer rate Ra of the first information signal A and the transfer of the second information signal B from the transfer rate Rp. The ratio with the difference value obtained by subtracting the rate Rb is Rp / (Rp-Ra-Rb) (Equation 4). At this time, Rp corresponds to one cycle period from the reproduction of the first and second information signals A and B to the next reproduction of the first information signal A, and (Rp-Ra-Rb) represents this. This corresponds to a seek period in one cycle period.

On the other hand, the time required for one cycle from the reproduction of the first and second information signals A and B to the next reproduction of the first information signal A, and the total seek time during this one cycle period Is (Ta + Tab + Tb + Tba) / (Tab + Tba) (Equation 5).

Here, since the ratio of the above equation (4) is equal to the ratio of the above equation (5), Rp / (Rp−Ra−Rb) = (Ta + Tab + Tb + Tba) / (Tab + Tba) (Equation 6) When this (Equation 6) is transformed, (Ta + Tb) = (Ra + Rb) × (Tab + Tba) / (Rp-Ra-Rb) (Equation 7) By substituting (2) and (3) into (7), (Ya + Yb) = Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (8)

The transfer rate Rp between the optical disk 13 and the track buffer memory 19 is constant,
On the other hand, the transfer rates Ra and Rb of the first and second information signals A and B read from the track buffer memory 19 are determined by the recording state of the optical disk 13,
Further, the seek times Tab and Tba described above depend on the address on the optical disc 13 to be reproduced and the specifications of the apparatus.
Is determined, the recording capacity Ya of the first information signal A and the capacity Yb of the second information signal B, which are the minimum capacities for continuously performing reproduction, are required to stably satisfy this relationship. Must satisfy the following (Equation 9), (Equation 10), and (Equation 11).

That is, (Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (Equation 9) Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb) ( Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb) (Equation 11) That is, the transfer rate Rp at the time of reproduction from the optical disc 13
And the transfer rate R of the first and second information signals (reproduced signals) A and B read from the track buffer memory 19.
a and Rb, and seek times Tab and Tba of the optical pickup 14 moving between the area positions of the first and second information signals A and B on the optical disk 13, the first and second information signals A and Rb are determined. , B, the recording capacity Ya, Y of the smallest recording unit
b or the reproduction times Ta and Tb are equal to the above (Equation 9) to (11).
If Expression (2) is not satisfied, the continuity at the time of reproduction of both information signals A and B will be lost.

In short, when reproducing the first information signal A, the data amount larger than the recording capacity Ya of the minimum recording unit is read into the track buffer memory 19 at a time to perform the reproduction process, and the second information signal B is reproduced. Is reproduced, the data amount equal to or larger than the recording capacity Yb of the minimum recording unit is read into the track buffer memory 19 at a time and reproduction processing is performed.

In other words, in the recorded read-only optical disc 13, in order to simultaneously and continuously reproduce the two information signals A and B as described above on the AV-ENDEC 20 side, the optical disc 13 in the reproducing apparatus is required. By setting the recording capacities Ya and Yb of the minimum recording unit as described above in consideration of the relationship between the transfer rate Ra for reproduction and the seek times Tab and Tba, continuous reproduction can be performed.

Further, even if the position where the data to be reproduced following Ya or Yb is present does not follow Ya or Yb on the optical disk 13, it is continuously reproduced even if it is at a remote position. Indicates that you can do it.

The above (Equation 9) to (Equation 11) represent the recording capacities Ya and Y of the minimum recording area of the two information signals A and B.
b is determined, the maximum size of the track buffer memory 19 is determined, and the EMPTY value and the FULL value are determined.

The basic minimum storage capacity Ym of the track buffer memory 19 is as follows: Ym> (Tb + Tab + Tba) × Ra + (Ta + Tab + Tba) × Rb (Equation 12) or Ym> Ta × (Rp−Ra) + Tb × (Rp−Rb) (Expression 13)

From the above (Equation 2), (Equation 3), (Equation 10), and (Equation 11), both of the above (Equation 12) and (Equation 13) can be expressed as follows. −Rb) × Rb｝ × (Tab + Tba) / (Rp−Ra−Rb) (Equation 14)

Therefore, basically, the first area 19 of the track buffer memory 19 for the first information signal A is
a is (Rp−Ra) × Ra × (Tab + Tba) / (R
p-Ra-Rb) or more and 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) or more and EMPTY value and FULL in this range
Determine the value.

However, this is a numerical value which has no margin at all in the management of the track / buffer memory 19, and secondly because of the relationship between the ideal two information signals A and B shown in FIG. In fact, the timing at which it is necessary to simultaneously reproduce the two information signals A and B occurs due to the transfer rate between the two information signals A and B and the input / output timing. In the time section, it is necessary to absorb the signal of one side in the track buffer memory 19 by temporarily storing the data.

Accordingly, in this case, the minimum storage capacity Ym of the track buffer memory 19 is as follows: Ym> (Ta + Tb + Tab + Tba) × (Ra + Rb) (Equation 15) More generally, the seek times Tab and Tba are fixed to the same value. Assuming time and T, Ym> (Ta + Tb + 2 × T) × (Ra + Rb) (16) Since the value of Ym does not calculate the function as a retry process, a function as a shock proof memory, and other system margins, it is necessary to secure at least a value larger than this value.

Therefore, the first area 19a of the track buffer memory 19 for the first information signal A is (Ta +
Tb + 2 × T) × Ra or more and EMPTY in this range
Value and the FULL value, and the second area 19b of the track buffer memory 19 for the second information signal B is (T
a + Tb + 2 × T) × Rb or more and EMP in this range
Determine the TY value and FULL value.

The above (Equation 15) and (Equation 16) are obtained from the above (Equation 2), (Equation 3), and (Equation 9) from the formula: Ym> Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra -Rb) (Equation 17) More generally, assuming that the seek times Tab and Tba are the same fixed time T, Ym> 2 * Rp * (Ra + Rb) * T / (Rp-Ra-Rb) ... ( 18)

Similarly, since the value of Ym does not calculate the retry process, the function as a shockproof memory, or other system margins, it is necessary to secure at least a value greater than this value.

Therefore, the first area 19a of the track buffer memory 19 for the first information signal A is Rp × R
a × (Tab + Tba) / (Rp−Ra−Rb) or more and the EMPTY value and the FULL value are determined in this range, and the track buffer memory 19 for the second information signal B is determined.
Of the second region 19b is Rp × Rb × (Tab + Tba)
/ (Rp-Ra-Rb) or more and EMPT in this range
Determine the Y value and FULL value.

In this embodiment, the track buffer memory 19 is a 64 Mb track buffer memory 19 connected to the signal processing circuit 18 in FIG. 1, but is naturally connected to the AV-ENDEC 20 in FIG. 6
A part of the 4 Mb buffer memory 21 is similarly track-
It may be used as a buffer memory.

That is, the track buffer memory 19 absorbs the difference between the transfer rate of the reproduction signal by the optical pickup 14 to the information signal recording medium such as the optical disk 13 and the transfer rate of the compressed and expanded signal such as video. . However, in this embodiment, the signal processing circuit 18 of FIG.
The recording capacity required by the first information signal A and the second information signal B is divided into one track buffer memory 19 by using the 64 Mb track buffer memory 19 connected as an example. In addition, by allocating and using the surplus area as the calculation result in that ratio, it is possible to increase the margin of each track buffer.

For example, the transfer rate R of the first information signal A
a is set to 8 Mbps, the required storage capacity of the first area 19a of the track buffer memory 19 for this first information signal A is set to 32 Mbps, while the second information signal B
Assuming that the transfer rate Rb is 4 Mbps and the required storage capacity of the second area 19b of the track buffer memory 19 for this second information signal A is 16 Mbps, 64
Rather than leaving the remaining 16 Mb, which is the remaining area of Mb, to be divided into 2 to 1 at about 10 Mb to 5 Mb,
The track buffer memory 19 is effective by setting the storage capacity of the first area 19a of the track buffer memory 19 to 32Mb + 10Mb = 42Mb and setting the storage capacity of the second area 19b of the track buffer memory 19 to 16Mb + 5Mb = 21Mb. Can be used for Thereby, two continuous information signals A and B can be simultaneously processed.

Further, during normal reproduction of any one of the information signal A and the information signal B, the entirety of the track buffer memory 19
Mb is used as one track buffer. This processing is performed by the system controller 22 that manages the reproduction, and instructs the reproduction of the first and first data to the track buffer memory 19 according to the reproduction instruction.
The second areas 19a and 19b are secured. This allows
It is possible to improve playability such as retry in a normal reproduction operation. Note that these first and second regions 1
The division of 9a and 19b is performed when the data in the track buffer memory 19 is confirmed when there is an instruction to input the reproduction, and when it is confirmed that there is no intermediate data being reproduced. This timing may be, for example, information signals A and B to be reproduced during the reproduction process.
Similarly, when the transfer rates Ra and Rb are changed, the data in the track buffer memory 19 is checked, and when it is confirmed that there is no intermediate data during reproduction / recording. As a result, the transfer rates Ra,
The margin of the track buffer memory 19 can be optimized in real time when Rb is changed.

Here, in the case of the read-only optical disk 13, the seek time Ta by the optical pickup 14 is used.
b, the maximum allowable time Tmax of Tbc = (Tab · ma
x) and (Tbc · max) are standardized in order to suppress variations among manufacturers, and the maximum allowable times (Tab · max) and (Tbc · max) are the same value, and for example, are the same values for the recording type. In the optical disk 13 for DVD,
It is set to 5 seconds. Therefore, if the above condition is applied to the above-described (Equation 9), (Ya + Yb) ≧ Rp × (Ra + Rb) × 2 × Tmax / (Rp−Ra−Rb) (Equation 19) By substituting Tmax = 1.5 seconds, (Ya + Yb) ≧ 3 × Rp × (Ra + Rb) / (Rp−Ra−Rb) (20), which is expressed by (19) or (20) The first and second areas 1 on the optical disc 13 so as to satisfy the conditions.
The first and second information signals A and B having the recording capacities Ya and Yb, respectively, should be recorded in advance in 3a and 13b.

<Information Signal Recording Apparatus> FIG. 7 is a diagram schematically showing an information signal recording apparatus to which the mode for recording the first and second information signals on an optical disk is applied, and FIG. 8 is the first and second information signals. FIG. 9 is a flowchart showing a state in which information signals are recorded on an optical disk, and FIG. 9 is a timing chart showing a state in which first and second information signals are recorded on an optical disk.

The information signal recording apparatus has the same technical idea as the information signal reproducing apparatus described above, and the input / output relationship is reversed with respect to the information signal reproducing apparatus.

As shown in FIG. 7, the information signal recording device comprises:
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, are converted by the optical pickup 14 into the first and second information signals. The recording operation 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 higher than the first and second transfer rates Ra and Rb.

That is, the optical disc 13 is formed so as to be recordable and reproducible.
A first area 13a for recording a first information signal A having a recording capacity Yb and a second area 13b for recording a second information signal B having a recording capacity Yb are prepared in advance.

Further, as described above with reference to the information signal reproducing apparatus, as shown in FIG. 4, the first area 13a on the optical disk 13 is divided into a plurality of areas within a range in which a seek time described later can be maintained. And addresses A1, A for each area.
., A3,... Are provided so that the first information signal A can be divided and recorded. Similarly, the second area 13b on the optical disk 13 is also divided into a plurality of pieces within a range in which a seek time described later can be maintained, and addresses B1, B2, B3,.
Can be divided and recorded. Also here, the capacities of the address areas A1, A2, A3,...
, B2, B3,... Correspond to the recording capacity Yb. At this time, between the first address area A1 in the first area 13a to be recorded first and the first address area B1 in the second area 13b to be recorded next, the optical pickup 14 The seek time of the optical pickup 14 that moves between the first information signal A and the second information signal B to be recorded next is set to a maximum at the maximum. 1.5 seconds or less.

When recording on the optical disc 13, the AV-
The MPEG encoder in the ENDEC 20 includes first and second MPEG encoders.
Mode in which the user specifies the transfer rates Ra and Rb of the information signals A and B (the transfer rate of 8 Mbp for high image quality).
s, a transfer rate of 4 Mbps for slightly higher picture quality and a transfer rate of 2 Mbps for normal picture quality) can be set, and the first and second information signals A and B to be recorded are AV-E.
The first and second 64Mb track buffer memories 19 connected from the NDEC 20 to the signal processing circuit 20 (FIG. 1)
At this time, the optical pickup 14 is in a standby state in which a predetermined track on the optical disc 13 to be recorded is in a kick waiting state. Each area 1 of the track buffer memory 19
While controlling the remaining amount in the tracks 9a and 19b,
The capacity of each area 19a, 19b of the buffer memory 19 is F
When the value reaches the UL value, the first information signal A stored in the first area 19a of the track buffer memory 19 as a correction unit by adding an error correction code, an address, and a sync signal during recording on the optical disc 13; The second information signal B stored in the second area 19b of the buffer memory 19
Are read out alternately in a time-division manner, the first information signal A read out at a constant transfer rate Rp by the optical pickup 14 is placed on the first area 13 a on the optical disc 13, and the second information signal B is placed on the optical disc 13. Are alternately recorded in time division on the second area 13b. Repeat this,
Continuous recording is performed.

Now, the operation of the information signal recording device will be described with reference to FIGS. Note that, in FIG.
The transfer rates Ra and Rb of the 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.

First, in step S51, a recording flow is started.

Next, in step S52, the first position where the optical pickup 14 wishes to record on the optical disc 13
It is confirmed whether or not the first address area A1 (target position) has been reached in the area 13a. If the address area A1 (target position) has not been reached, this step S
52 is further continued, and when it reaches the address area A1 (destination position), the process proceeds to the next step S53.

Next, in step S53, AV-END
The first information signal A sent from the EC 20 at the transfer rate Ra is transferred to the first area 19 of the track buffer memory 19.
a is temporarily stored. 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. It is stored at the transfer rate Ra.

Next, in step S54, the first area stored in the first area 19a in the track buffer memory 19 is read.
Question whether the information signal A of the FULL value has reached the FULL value.
If the LL value has not been reached, the operation of step S53 is continued, and if the FULL value has been reached, the process proceeds to the next step S55.

Next, in step S55, when the first information signal A reaches the FULL value, the first information signal A is read out to the optical pickup 14 at a constant transfer rate Rp, as shown in FIG. Between the FULL value and the EMPTY value, the first information signal A is reduced by the slope of the difference (Rp-Ra) while the first information signal A is
Thus, the data is recorded in the first area 13a on the optical disc 13 at a constant transfer rate Rp.

Next, in step S56, it is asked whether 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 returns to step S55. If the EMPTY value has been reached, the next step S5 is performed.
Go to 7.

Next, in step S57, 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 The recording in the first address area A1 in the area 13a is stopped. Here, from the stage where the recording of the first information signal A is stopped, the first information signal A is continuously transmitted from the AV-ENDEC 20 side at the transfer rate Ra to the first area 19a in the track buffer memory 19. However, this writing operation is shown in FIG.
As is clear from FIG. 1, the period up to the FULL value is the first.
It should be completed before the recording of the second address area A2 in the area 13a is started.

Next, in step S58, the second area 1 on the optical disk 13 to be recorded next by the optical pickup 14 is
Move to the first address area B1 in 3b. 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 disc 13 to the first address area B1 in the second area 13b is 1.5 at the maximum. Within seconds.

Next, in step S59, 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 S59 is further continued, and the address area B1 is reached.
When it reaches 1 (target position), the process proceeds to the next step S60.

Next, in step S60, AV-END
The second information signal B sent from the EC 20 at the transfer rate Rb is stored in the second area 19 of the track buffer memory 19.
b is temporarily stored at the transfer rate Rb up to the FULL value.

Next, in step S61, the second data stored in the second area 19b in the track buffer memory 19 is read.
Question whether the information signal B has reached the FULL value.
If the LL value has not been reached, the operation of step S60 is continued, and if the FULL value has been reached, the flow proceeds to the next step S62.

Next, in step S62, when the second information signal B reaches the FULL value, the second information signal B is read out to the optical pickup 14 at a constant transfer rate Rp, as shown in FIG. Between the FULL value and the EMPTY value, the second information signal B is reduced by the slope of the difference (Rp−Rb) while the second information signal B is
Accordingly, the data is recorded in the second area 13b on the optical disc 13 at a constant transfer rate Rp.

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 EMPTY value.
If the EMPTY value has not been reached, the process returns to step S62. If the EMPTY value has been reached, the next step S6 is performed.
Proceed to 4.

Next, in step S64, 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 The recording in the address area B1 of the area 13b is stopped. Here, from the stage where 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. 9, this write operation may be completed before the period up to the FULL value is reached before the start of recording in the second address area B2 in the second area 13b.

Next, in step S65, the first area 1 on the optical disc 13 to be recorded next by the optical pickup 14 is determined.
Move to the second address area A2 in 3a. 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 disc 13 to the second address area A2 in the first area 13a is 1.5 at the maximum. Within seconds. Then, the optical pickup 14 is moved to the first area 13 a on the optical disc 13.
When the second area A2 is reached, the process returns to step S52 and repeats in the same manner. If the first and second information signals A and B are transmitted to the address areas A1, B1,
A2, B2, A3, B3,... Can be sequentially and continuously recorded in a time-division manner.

The flow for stopping all recording by the optical pickup 14 may be inquired after the step 57 or after the step 64, but the operation is complicated, so that it is omitted here.

In the recording flow described above, the track buffer memory 19 reaches the FULL value from the empty state in the first cycle, but the recording capacity between the EMPTY value and the FULL value in the second and subsequent cycles. The first information signal A having Ya and the second information signal B having recording capacity Yb are stored.

In the information signal recording apparatus described above,
Although the relationship between input and output is reversed, it was explained earlier (Equation 1)
To (Equation 18), and a detailed description thereof will be omitted.

<Information Signal Recording / Reproducing Apparatus> FIG.
FIG. 11 schematically shows an information signal recording apparatus to which a mode for recording a second information signal on an optical disc is applied.
FIG. 12 is a flowchart showing a state in which the second information signal is recorded on the optical disk, and FIG. 12 is a timing chart showing a state in which the first and second information signals are recorded on the optical disk.

As shown in FIG. 10, the information signal recording / reproducing apparatus is a combination of the information signal recording apparatus described above and the information signal reproducing apparatus, and the first and second transfer rates Ra and Rb are set to be equal to each other. The information signal A (B) of one of the first and second information signals A and B
The optical pickup 1 is moved from the upper one area 13a (13b).
4 and the first and second transfer rates R
a and Rb at a constant transfer rate Rp, which is stored in one area 19a, (19b) of the track buffer memory 19, and the other information signal B (A) is stored in the other area 19b, ( 19a) is read out at a constant transfer rate Rp by the optical pickup 14 and recorded in the other area 13b (13a) on the optical disk 13 in a time-division manner.

Here, the operation of the information signal recording / reproducing apparatus will be described with reference to FIG. 11 and FIG. In FIG. 12, the transfer rates Ra, R of the first and second information signals A, B are shown.
b is shown at the same transfer rate for convenience of illustration,
Even if the two are different, they show the same tendency.

First, in step S71, a recording / reproducing flow is started.

Next, in step S72, the first position where the optical pickup 14 is to be reproduced on the optical disk 13 is determined.
It is confirmed whether or not the first address area A1 (target position) has been reached in the area 13a. If the address area A1 (target position) has not been reached, this step S
72 is further continued, and when it reaches the address area A1 (destination position), the process proceeds to the next step S73.

Next, in step S73, the optical pickup 14 moves the first address area A in the first area 13a.
1 to start reproduction and transfer the first information signal A to the transfer rate R
p indicates the first area 19 in the track buffer memory 19
a is temporarily stored. 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 only in the first cycle. A is stored at the transfer rate Rp until A reaches the EMPTY value.

Next, in step S74, the first area 19a stored in the first area 19a in the track buffer memory 19 is read.
Question whether the information signal A of the E has reached the EMPTY value.
If the MPTY value has not been reached, the process returns to step S73. On the other hand, if the MPTY value has been reached, the process proceeds to the next step S75.

Next, in step S75, if the first information signal A exceeds the EMPTY value, the first information signal A is read out to the AV-ENDEC 20 (FIG. 1) at the transfer rate Ra, as shown in FIG. EMPTY value and FU
Between the LL value and the transfer rate Rp at which the first information signal A is written to the first area 19a of the track buffer memory 19, the first information signal A is transferred from the first area 19a to the AV-ENDEC 20 side. Read transfer rate Ra
The first information signal A is temporarily stored in the first area 19a while increasing with the slope of the difference (Rp-Ra).

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 FULL value.
If the value has not reached the UL value, the process returns to step S75. If the value has reached the FULL value, the process returns to step S75.
Go to 77.

Next, in step S77, 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 1 in the area 13a of
The reproduction in the address area A1 is stopped. here,
From the stage where 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 continuously read to the AV-ENDEC 20 at the transfer rate Ra. However, in this read operation, as is clear from FIG. 12, the period until the EMPTY value is reached is the second address area A in the first area 13a.
2 may be completed before the reproduction is started.

Next, in step S78, the optical pickup 14 moves to the first address area B1 in the second area 13b on the optical disk 13 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 disc 13 to the first address area B1 in the second area 13b is 1.5 at the maximum. Within seconds.

Next, in a step S79, 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 disk 13. If the address area B1 (target position) has not been reached, step S79 is continued and the address area B1 is reached.
When it reaches 1 (target position), the process proceeds to the next step S80.

Next, in step S80, AV-END
The second information signal B sent from the EC 20 at the transfer rate Rb is stored in the second area 19 of the track buffer memory 19.
b is temporarily stored at the transfer rate Rb up to the FULL value.

Next, at step S81, the second area 19b stored in the second area 19b in the track buffer memory 19 is read.
Question whether the information signal B has reached the FULL value.
If the LL value has not been reached, the process returns to step S80,
On the other hand, when the FULL value is reached, the next step S82
Proceed to.

Next, in step S82, when the second information signal B reaches the FULL value, the second information signal B is read out to the optical pickup 14 at a constant transfer rate Rp, as shown in FIG. Between the FULL value and the EMPTY value, the second information signal B is reduced by the slope of the difference (Rp-Rb) while the second information signal B is
4, the data is recorded in the second area 13b on the optical disc 13 at a constant transfer rate Rp.

Next, in step S83, it is asked whether 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 returns to step S82, while if the EMPTY value has been reached, the process proceeds to the next step S84.

Next, in step S84, 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 The recording in the address area B1 of the area 13b is stopped. Here, from the stage where 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.
This write operation is FULL as is apparent from FIG.
The period up to the value may be completed before the start of recording in the second address area B2 in the second area 13b.

Next, in step S85, the optical pickup 14 moves to the second address area A2 in the first area 13a on the optical disc 13 to reproduce the next first information signal A. 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 disc 13 to the second address area A2 in the first area 13a is 1.5 at the maximum. Within seconds.

When the optical pickup 14 reaches the second area A2 in the first area 13a on the optical disk 13, the process returns to step S72 and the same is repeated thereafter. A and B are divided into address areas A1, B1, A2, B2, A3, B3,.
.. Can be recorded and reproduced alternately in a time-division manner. At this time, the address information of the second information signal B recorded in the free area in the second area 13b on the optical disc 13 is recorded in the management area 13c after the recording is completed.

The flow for stopping all the recording and reproduction by the optical pickup 14 may be inquired after the step 79 or after the step 86, but the operation is complicated, so that it is omitted here.

In the flow of time-division recording / reproduction of the two information signals, the track / buffer memory 1
In the second area 19b of No. 9 from the empty state to the FULL value in the first cycle, the second information signal B having the recording capacity Yb between the EMPTY value and the FULL value is transmitted in the second and subsequent cycles. I will remember.

The information signal recording / reproducing apparatus described above also satisfies the above-described (Equation 1) to (Equation 18), and a detailed description thereof will be omitted.

Here, in the information signal recording / reproducing apparatus described above, for example, while the first information signal A is being reproduced from the optical disc 13 first, a new second information signal B is reproduced.
Is recorded, the second information signal B to be recorded is input, and the transfer rate Rb of the second information signal B is input and set. At this time, the system controller 22 determines the set value of the transfer rate Rb of the input second information signal B and the transfer rate R of the currently reproduced first information signal A.
a and an empty area for recording in the management area of the optical disk 13 and a seek time previously recorded in the ROM as an apparatus, as described in the equations (9), (10), and (11).
To determine the capacity of the minimum recording area for recording.

For example, when there is only a large unrecorded area on the optical disc 13, the capacity of the minimum recording area does not matter, but when small unrecorded areas are scattered due to repetition of editing and the like, Can be recorded only in a free area larger than the minimum recording area, and cannot be recorded in a smaller free area.

As described above, when an area cannot be secured effectively, the transfer rate Rb of the second information signal B to be recorded is
It is also possible to lower the transfer rate designated as, notify the user, and perform recording as described above with this reduced value.

Next, the information signal recording and / or reproducing apparatus 1
Information signal recording and / or reproducing apparatus 1 partially modified from 0A
OB will be briefly described with reference to FIG.

FIG. 13 is a block diagram for explaining the overall configuration of the information signal recording and / or reproducing apparatus 10B.

In the information signal recording and / or reproducing apparatus 10 B shown in FIG. 13, the optical disk drive D side includes optical disk rotating means 11, 12, optical pickup 14, driver circuit 15, preamplifier 1 in a frame surrounded by a chain line.
6, the servo circuit 17 is provided as a unit, and the signal processing circuit 1 is provided in a frame surrounded by an alternate long and short dash line as the solid-state memory M side.
8, track buffer memory 19, AV-ENDEC
20, buffer memory 21, system controller 2
2, a plurality of keys 23 are provided as a unit,
The difference from the first embodiment is that the solid-state memory M is detachable from the optical disk drive D by connecting a connector (not shown). In other words, the track buffer memory 19 or the buffer memory 21 in the solid-state memory M is
It is detachable from the side. Therefore, when the solid-state memory M is mounted on the optical disk drive D, either one or both of the first and second information signals A and B read from the optical disk 13 by the optical pickup 14 are temporarily stored as in the first embodiment. When the solid-state memory M is removed from the optical disk drive D, the first and first memories temporarily stored in the track buffer memory 19 or the buffer memory 21 are stored.
Either one or both of the second information signals A and B can be reproduced by the AV-ENDEC 20 serving as a reproduction processing means. At this time, since the capacity of the track buffer memory 19 or the buffer memory 21 is 64 Mbits, the audio signal can be reproduced for about 1 hour and the video signal can be reproduced for about 10 minutes. When the track / buffer memory 19 or the buffer memory 21 is mounted on the optical disk drive D, the device functions as an apparatus. When the track / buffer memory 19 or the buffer memory 21 is removed from the optical disk drive D, a portable solid-state memory is reproduced. The device can function as a device.

<Second Embodiment> FIG. 14 is a block diagram for explaining the overall configuration of an information signal communication apparatus according to the present invention. For convenience of description, the same components as those described above are denoted by the same reference numerals, and will be described appropriately.
In addition, new constituent members are denoted by new reference numerals, and the second embodiment will be described focusing on differences from the first embodiment.

The information signal recording and / or reproducing apparatus 10A described above is an optical disk player that compresses and expands a video signal and an audio signal, whereas the information signal communication apparatus 25A shown in FIG. An optical disk drive having no compression / decompression block and a track / buffer memory 1 provided in the optical disk drive.
9 is provided on the output side of the ATAPI interface 26 for communication connection with the outside, and a host 27 serving as a host computer externally and a compression / decompression block of an AV-ENDEC (audio / video / encoder / decoder) 20 Are connected, but the other parts are the same as in the first embodiment. The optical disk drive described above uses the information signal recording and / or
Alternatively, in the reproducing apparatus 10A, the AV-ENDEC 20, the buffer memory 21, and the key 23 are removed.

More specifically, there is an I / F block in the ATAPI interface 26, and the AV-EN
The I / F block of the DEC 20 has an I / F block, and the AT
It is connected by an API interface 26 and mount Fuji Mt. The optical disk drive is controlled based on the Fuji command system.

That is, in the first embodiment described above, the first and the first data input during recording by the optical disc player 10 are used.
The transfer rates Ra and Rb are determined by analyzing the second information signals A and B, and the transfer of the first and second information signals A and B from the recording state of the optical disk 13 during reproduction of the optical disk player 10. The rates Ra and Rb are determined by calculation. However, in the second embodiment, since the optical disk drive does not have a key input unit or a decode unit for control data from the optical disk 13, the first and second rates to be recorded during recording are set. 2 transfer rates Ra and Rb of information signals A and B
Is the IAPI in the ATAPI interface 26 from the host.
/ F block.

At this time, in the case of a recording process, for example, when a video signal having a transfer rate of 2 Mbps is input, the host 27
Transfers the contents to the I / F section of the AV-ENDEC 20, and transfers the transfer rate flag of the signal to the optical disk drive in addition to the information such as the recording command and the recording start address as described below. This is decoded by the signal processing section of the optical disk drive, and the recording process is performed as described above according to the type.

Next, in the case of reproduction processing, for example, a video signal recorded at a predetermined address of the optical disc 13 is reproduced according to a reproduction command based on the command system of the mount Fuji as described above. The host 27 interprets this data and calculates the transfer rate as described above. Then, for example, the host 27 determines that the video signal has a transfer rate of 2 Mbps by the I / F in the AV-ENDEC 20.
The content is transferred to the unit, and the transfer rate flag of the signal is transferred in addition to the reproduction command as described below. This is decoded in the signal processing section, and the reproduction processing is performed as described above according to the transfer rate.

Although the embodiment for performing communication has been described using the TAPI interface 26 for performing communication connection with the outside, a standard such as IEEE1394 may be used.
Communication using radio waves or light other than communication using such a cable may also be used. The signals to be recorded and reproduced are
Although video data was mainly explained, audio and music data
Needless to say, it may be a still image, a sub-picture, or a decoded signal obtained by decoding these. In other words, the transfer rate referred to here indicates a data transfer rate in a range that cannot be established as information unless data is transferred at a certain range on average. Further, in the present embodiment, the optical disk 13 is mainly described, but the present invention can also be applied to an apparatus such as a magnetic disk apparatus which has a plurality of disks and a plurality of heads and performs recording and reproduction while alternately switching these. Although the disk is assumed to be a spiral continuous track, the present invention can also be applied to a case where the disk includes a plurality of concentric tracks like a magnetic disk device. In this case, a kick operation of the track is performed in the continuous recording and reproduction, but this operation can be similarly applied if it is considered as a seek time. Further, the recording / reproducing procedure and the contents of the display are merely examples, and are not limited to this range.

Although the transfer rate of a signal is mainly described with respect to a continuous signal such as video or audio, computer data that does not make sense unless processed within a predetermined time is used. Belongs to continuous data, and
Generally, it includes a variable transfer rate and a fixed transfer rate that change every moment depending on image quality and the like on the time axis.

Next, an information signal communication device 25B obtained by partially modifying the information signal communication device 25A will be briefly described with reference to FIG.

FIG. 15 is a block diagram for explaining the overall configuration of information signal communication device 25B.

In the information signal communication device 25B shown in FIG. 15, the optical disk rotating means 11, 12 and the optical pickup 1 are placed in a frame surrounded by a dashed line on the optical disk drive D side.
4, a driver circuit 15, a preamplifier 16, and a servo circuit 17 are provided as a unit, and a signal processing circuit 18, a track
The second embodiment differs from the second embodiment in that the buffer memory 19 and the system controller 22 are provided as a unit, and the solid-state memory M is detachably connected to the optical disk drive D and the ATAPI interface 26 by a connector (not shown). It is different. In other words, the track / buffer memory 19 in the solid-state memory M is connected to the optical pickup
It is detachable from the TAPI interface 26 side. Therefore, when the solid-state memory M is mounted on the optical disk drive D and the ATAPI interface 26, either one of the first and second information signals A and B read from the optical disk 13 by the optical pickup 14 as in the second embodiment, or Both are temporarily stored, and when the solid-state memory M is removed from the optical disk drive D and the ATAPI interface 26 side, one or both of the first and second information signals A and B temporarily stored in the track buffer memory 19 are read. Can be played. At this time,
Since the capacity of the buffer memory 19 is 64 Mbits, the audio signal can be reproduced for about 1 hour and the video signal can be reproduced for about 10 minutes.

[0145]

As described above in detail, according to the present invention, the maximum transfer capacity of the information signal recording medium can be obtained, and the first and second information signal areas can be efficiently divided in the buffer memory. In addition to this, the user can smoothly obtain continuous playback, continuous recording, and continuous recording and playback functions of the first and second information signals.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of an information signal recording and / or reproducing apparatus.

FIG. 2 is a diagram showing an information signal recording and / or reproducing apparatus in which a first and a second area on an optical disc and a first and a second area on a track buffer memory are interposed; FIG. 3 is a diagram schematically illustrating a state in which an information signal is recorded and / or reproduced in a time division manner by one optical pickup.

FIG. 3 is a diagram schematically showing an information signal reproducing device to which a mode for reproducing first and second information signals from an optical disk is applied.

FIG. 4 is a diagram showing addresses of first and second areas on an optical disc.

FIG. 5 is a flowchart showing a state in which first and second information signals are reproduced from an optical disc.

FIG. 6 is a timing chart showing a state in which first and second information signals are reproduced from an optical disc.

FIG. 7 is a diagram schematically showing an information signal recording apparatus to which a mode of recording first and second information signals on an optical disc is applied.

FIG. 8 is a flowchart showing a state in which first and second information signals are recorded on an optical disc.

FIG. 9 is a timing chart showing a state in which first and second information signals are recorded on an optical disc.

FIG. 10 is a diagram schematically showing an information signal recording apparatus to which a mode for recording and reproducing first and second information signals on an optical disk is applied.

FIG. 11 is a flowchart showing a state in which first and second information signals are recorded / reproduced on / from an optical disc.

FIG. 12 is a timing chart showing a state in which first and second information signals are recorded and reproduced on an optical disk.

FIG. 13 is a block diagram illustrating an overall configuration of an information signal recording and / or reproducing apparatus according to a modification.

FIG. 14 is a block diagram for explaining the overall configuration of the information signal communication device.

FIG. 15 is a block diagram illustrating an overall configuration of an information signal recording and / or reproducing apparatus according to a modification.

[Explanation of symbols]

10A, 10B ... information signal recording and / or reproducing apparatus, 1
3: information signal recording medium (optical disk), 13a: first area, 13b: first area, 14: head (optical pickup), 19: track / buffer memory, 19a: first area, 19b: first Area, 20... Audio / video / encoder / decoder (AV-ENDEC), 2
5A, 25B ... information signal communication device, 26 ... ATAPI
interface.

Claims (3)

[Claims] 1. A method for rotating an information signal recording medium on which first and second information signals are recorded at first and second positions, respectively, from the first and second positions on the information signal recording medium. Temporarily storing the first and second information signals reproduced in a time-division manner in a buffer memory, and outputting the first and second information signals at first and second transfer rates, respectively; The first and second information signals reproduced in a time-division manner from the first and second positions on the information signal recording medium from one head at a transfer rate faster than the first and second transfer rates; A time-division transfer to the buffer memory; a transfer rate of the head to the first and second information signals... Rp; a transfer rate of the first information signal. Transfer rate: Rb, retransmission of the first information signal Raw information unit amount ... Ya, reproduction information unit amount of the second information signal ... Yb, time required for the head to move from the first position to the second position on the information signal recording medium ... Tab, the head Is the time required to move from the second position to the first position on the information signal recording medium... Tba, and (Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + T
reproducing the first and second information signals from the information signal recording medium while satisfying a relational expression of ba) / (Rp-Ra-Rb). 2. The method according to claim 1, further comprising the steps of: rotating an information signal recording medium for recording first and second information signals, respectively;
Temporarily storing a second information signal in a buffer memory; and a transfer rate faster than the first and second transfer rates of the first and second information signals read out from the buffer memory in a time-sharing manner. A time-division recording from one head to the first and second positions on the information signal recording medium, and a transfer rate from the head to the first and second information signals... Rp; The transfer rate of the information signal: Ra, the transfer rate of the second information signal: Rb, the recording information unit amount of the first information signal: Ya, the recording information unit amount of the second information signal: Yb, the head Is the time required to move from the first position to the second position on the information signal recording medium... Tab, and is the time required for the head to move from the second position to the first position on the information signal recording medium. Tba and ( a + Yb) ≧ Rp × (Ra + Rb) × (Tab + T
recording the first and second information signals on the information signal recording medium while satisfying a relational expression of ba) / (Rp-Ra-Rb). 3. A step of rotating an information signal recording medium for recording and reproducing which records one of the first and second information signals and reproduces the other of the first and second information signals; One information signal reproduced from the position is temporarily stored in the buffer memory,
And temporarily storing the other information signal input at the second transfer rate in the buffer memory, and outputting the other information signal from the first position on the information signal recording medium. Transferring the information signal to the buffer memory at a constant transfer rate higher than the first and second transfer rates; and transferring the other information signal input to the buffer memory at the transfer rate on the information signal recording medium. A step of performing the recording at the second position in a time-division manner; a transfer rate of the head to the first and second information signals ... Rp; a transfer rate of the first information signal ... Ra; Transfer rate of information signal of No. 2 ... Rb, recording / reproducing information unit amount of the first information signal ... Ya, recording / reproducing information unit amount of the second information signal ... Yb, Time required to move from the first position to the second position on the information signal recording medium: Tab, Time required to move the head from the second position to the first position on the information signal recording medium: Tba , (Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + T
recording and reproducing the first and second information signals on the information signal recording medium while satisfying a relational expression of ba) / (Rp-Ra-Rb).