JP2004192786A - Information signal reproducing program, information signal recording program, information signal recording and reproducing program, information recording medium, information signal producing method, information signal recording method, and information signal recording and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information signal reproducing program by which a difference of transfer speeds of first and second information signals is absorbed between an information signal recording medium and a buffer memory. <P>SOLUTION: When difference between transfer speed for first and second information signals by one pickup head for the medium and transfer speed of the first and the second information signals in the buffer memory is absorbed, a transfer rate for the first, the second information signals by the head is assumed to Rp, a transfer rate of the first information signal is assumed to Ra, a transfer rate of the second information signal is assumed to Rb, storage capacity of the buffer memory is assumed to Ym, a seek time in which the head is shifted from a first region to a second region on the medium is assumed to Tab, and a seek time in which the head is shifted from a second region to a first region on the medium is assumed to Tab, then, the first , the second information signals are reproduced so as to satisfy Ym>[(Rp-Ra)×Ra+(Rp-Rb)×Rb]×(Tab+Tba+Fab+Fba)/(Rp-Ra-Rb). <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  According to the present invention, first and second information signals based on video information such as two movies and audio information such as two musics are time-divisionally combined with a single pickup (or head) through a buffer memory. An information signal reproducing program, an information signal recording program, an information signal recording / reproducing program for causing a computer to execute recording and / or reproducing (recording, reproducing, recording / reproducing) processing on a disk-shaped recording medium having at least two signal surfaces; The present invention relates to an information recording medium on which these programs are recorded, an information signal reproducing method, an information signal recording method, and an information signal recording / reproducing method.

2. Description of the Related Art Conventionally, in an optical disk device (for example, a DVD player, a DVD recorder, a combination of a DVD drive and a PC and software) that uses an optical disk as an information signal recording medium, information signals such as video information such as movies and audio information such as music are compressed. Then, the optical information is recorded on the optical disk by one optical pickup, and the compressed information signal read from the optical disk by the optical pickup at the time of reproduction is decompressed. Simultaneous recording / playback, simultaneous playback / playback, simultaneous playback such as expansion of a compressed information signal read out from the optical disc by the optical pickup during playback and compression of an information signal such as audio information such as music and recording on an optical disk by one optical pickup. The recording process during recording is performed by using video information such as two movies or audio information such as music. Absorbed in the buffer memory based on the relationship between the transfer rate of the information signal, the transfer rate of the signal recorded / reproduced on the optical disk, and the travel time between the information signals such as video information such as two movies and audio information such as music It is disclosed that it is realized by doing.
JP 2001-167519 A

  By the way, the recording / reproducing apparatus disclosed in Patent Document 1 is configured so that the recording / reproducing operation can be performed satisfactorily as processing from the viewpoint of movement between two signals between one signal surface. In recent years, with the increase in the density and capacity of information signal recording media such as optical disks, two information signals have been recorded on different areas of an information signal recording medium having at least two information signal surfaces by one optical pickup (or head). It is required that recording and / or reproducing be performed alternately. 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 stored in the buffer memory. Can be efficiently divided, and the user can smoothly obtain the functions of continuous reproduction, continuous recording, and continuous recording / reproduction of the first and second information signals. Signal reproduction program, the information signal recording program, the information signal recording and reproducing program, an information recording medium, an information signal reproducing method, and to provide an information signal recording method and an information signal recording and reproducing method.

The present invention has been made in view of the above problems, and has an information signal reproducing program, an information signal recording program, an information signal recording and reproducing program, an information recording medium, and an information signal reproducing having the following configurations (1) to (9). A method, an information signal recording method, and an information signal recording / reproducing method are provided.
(1) The first and second information signals reproduced in a time-division manner from the first and second positions on the information signal recording medium having at least the first and second signal layers readable in one direction. Temporarily storing 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 from the first and second positions on the information signal recording medium in a time-division manner at a constant transfer rate higher than the first and second transfer rates by one head. Transferring to the buffer memory in a time-sharing manner from
Transfer rates of the first and second information signals transferred from the head to the buffer memory... Rp,
A transfer rate for outputting the first information signal from the buffer memory... Ra;
A transfer rate for outputting the second information signal from the buffer memory... Rb;
An information unit quantity... Ya for transferring the first information signal from the head to the buffer memory;
An information unit amount... Yb for transferring the second information signal from the head 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,
Time required for the head to move from the second position to the first position on the information signal recording medium ... Tba
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Reproducing the first and second information signals from the information signal recording medium while satisfying the relational expression (1).
(2) temporarily storing the first and second information signals respectively input at the first and second transfer rates in a buffer memory;
The first and second information signals read in a time-division manner from the buffer memory can be read from one head in one direction at a constant transfer rate higher than the first and second transfer rates. Time-division recording at first and second positions on an information signal recording medium having a second signal layer;
The transfer rates of the first and second information signals to be transferred from the buffer memory to the head, Rp,
A transfer rate for inputting the first information signal into the buffer memory... Ra;
A transfer rate for inputting the second information signal to the buffer memory... Rb;
An information unit amount for transferring the first information signal to the head from the buffer memory... Ya,
An information unit quantity... Yb for transferring the second information signal from the buffer memory to the head;
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,
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Recording the first and second information signals on the information signal recording medium while satisfying the relational expression (1).
(3) On an information signal recording medium having at least first and second signal layers readable from one direction for recording / reproduction for recording one of the first and second information signals and reproducing the other. Temporarily stores the one information signal reproduced from the first position in the buffer memory, outputs the information signal at the first transfer rate, and temporarily stores the other information signal input at the second transfer rate. Storing 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 faster than the first and second transfer rates; Recording the other information signal at a second position on the information signal recording medium at the transfer rate in a time-division manner;
Transfer rates of the first and second information signals input / output to / from the buffer memory by the head ... Rp,
A transfer rate for inputting the first information signal into the buffer memory... Ra;
A transfer rate for outputting the second information signal from the buffer memory... Rb;
An information unit amount for transferring the first information signal to the head from the buffer memory... Ya,
An information unit amount... Yb for transferring the second information signal from the head 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,
Time required for the head to move from the second position to the first position on the information signal recording medium: Tba,
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Recording and reproducing the first and second information signals on the information signal recording medium by satisfying the relational expression (1).
(4) The first and second information signals reproduced in a time-division manner from the first and second positions on the information signal recording medium having at least the first and second signal layers readable in one direction. Temporarily storing 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 from the first and second positions on the information signal recording medium in a time-division manner at a constant transfer rate higher than the first and second transfer rates by one head. Transferring to the buffer memory in a time-sharing manner from
Transfer rates of the first and second information signals transferred from the head to the buffer memory... Rp,
A transfer rate for outputting the first information signal from the buffer memory... Ra;
A transfer rate for outputting the second information signal from the buffer memory... Rb;
An information unit quantity... Ya for transferring the first information signal from the head to the buffer memory;
An information unit amount... Yb for transferring the second information signal from the head 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,
Time required for the head to move from the second position to the first position on the information signal recording medium ... Tba
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Reproducing the first and second information signals from the information signal recording medium while satisfying the relational expression (1).
(5) temporarily storing the first and second information signals respectively input at the first and second transfer rates in a buffer memory;
The first and second information signals read in a time-division manner from the buffer memory can be read from one head in one direction at a constant transfer rate higher than the first and second transfer rates. Time-division recording at first and second positions on an information signal recording medium having a second signal layer;
The transfer rates of the first and second information signals to be transferred from the buffer memory to the head, Rp,
A transfer rate for inputting the first information signal into the buffer memory... Ra;
A transfer rate for inputting the second information signal to the buffer memory... Rb;
An information unit amount for transferring the first information signal to the head from the buffer memory... Ya,
An information unit quantity... Yb for transferring the second information signal from the buffer memory to the head;
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,
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Recording a first information signal and a second information signal on the information signal recording medium by satisfying the relational expression (1).
(6) On an information signal recording medium having at least first and second signal layers readable from one direction for recording / reproduction for recording one of the first and second information signals and reproducing the other. Temporarily stores the one information signal reproduced from the first position in the buffer memory, outputs the information signal at the first transfer rate, and temporarily stores the other information signal input at the second transfer rate. Storing 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 faster than the first and second transfer rates; Recording the other information signal at a second position on the information signal recording medium at the transfer rate in a time-division manner;
Transfer rates of the first and second information signals input / output to / from the buffer memory by the head ... Rp,
A transfer rate for inputting the first information signal into the buffer memory... Ra;
A transfer rate for outputting the second information signal from the buffer memory... Rb;
An information unit amount for transferring the first information signal to the head from the buffer memory... Ya,
An information unit amount... Yb for transferring the second information signal from the head 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,
Time required for the head to move from the second position to the first position on the information signal recording medium: Tba,
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Recording and reproducing the first and second information signals on the information signal recording medium by satisfying the relational expression (2).
(7) recording the first and second information signals at the first and second positions, respectively, and rotating an information signal recording medium having at least the first and second signal layers readable from one direction; ,
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 temporarily stored in a buffer memory, and the first and second information signals are stored. At the 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 at a third transfer rate faster than the first and second transfer rates. Transferring time-divisionally from one head to the buffer memory;
The information signal amount for transferring the first information signal from the head to the buffer memory or the information unit amount for transferring the second information signal from the head to the buffer memory; A time required for the head to move from the first position to the second position, a time required for the head to move from the second position on the information signal recording medium to the first position, Is the time required for the head to move from the first signal layer on the information signal recording medium to the second signal layer, and the first signal is transmitted from the second signal layer on the information signal recording medium to the first signal layer. An information signal reproducing method, comprising: a step of determining based on a time required for moving to a layer and a relationship among the first, second, and third transfer rates.
(8) rotating an information signal recording medium having at least the first and second signal layers readable from one direction for recording the first and second information signals, respectively;
Temporarily storing the first and second information signals respectively input at the first and second transfer rates in a buffer memory;
The first and second information signals read in a time-division manner from the buffer memory are transferred from one head to the first and second information signals on the information signal recording medium at a third transfer rate faster than the first and second transfer rates. , Time-divisionally recording at a second location;
The information unit amount for transferring the first information signal to the head from the buffer memory or the information unit amount for transferring the second information signal to the head from the buffer memory, wherein the information signal recording medium A time required for the head to move from the first position to the second position, a time required for the head to move from the second position on the information signal recording medium to the first position, Is the time required for the head to move from the first signal layer on the information signal recording medium to the second signal layer, and the first signal is transmitted from the second signal layer on the information signal recording medium to the first signal layer. An information signal recording method, comprising the step of determining based on a relationship between a time required for moving to a layer and the first, second, and third transfer rates.
(9) An information signal recording medium having at least first and second signal layers that can be read from one direction for recording and reproduction, in which one of the first and second information signals is recorded and the other is reproduced. Rotating,
One information signal reproduced from a first position on the information signal recording medium is temporarily stored in a buffer memory and output at a first transfer rate, and the other information input at a second transfer rate. Temporarily storing a signal in said buffer memory;
Transferring one information signal reproduced from the first position on the information signal recording medium to the buffer memory at a third transfer rate faster than the first and second transfer rates;
Recording the other information signal input to the buffer memory at a second position on the information signal recording medium at the transfer rate in a time-division manner;
An information unit amount for transferring the first information signal from the buffer memory to the head; an information unit amount for transferring the second information signal from the head to the buffer memory; A time required for the head to move from the first position to the second position, a time required for the head to move from the second position on the information signal recording medium to the first position, Is the time required for the head to move from the first signal layer on the information signal recording medium to the second signal layer, and the first signal is transmitted from the second signal layer on the information signal recording medium to the first signal layer. An information signal recording / reproducing method, comprising a step of determining based on a time required for moving to a layer and a relationship between the first, second, and third transfer rates.

  As described in detail above, according to the present invention, the transfer rate of one head to the first and second information signals... Rp, the transfer rate of the first information signal... Ra, and the transfer rate of the second information signal ... Rb, storage capacity Ym of the buffer memory, seek time for the head to move from the first area to the second area on the information signal recording medium ... Tab, the head to the first area from the second area on the information signal recording medium Seek time to move to the area of... Tba, time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium. Time required to move from the second signal layer to the first signal layer: Fba, and Ym> {(Rp−Ra) × Ra + (Rp−Rb) × Rb} × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb) Satisfies As a result, 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. As a user, there is an effect that a function such as continuous reproduction, continuous recording, or continuous recording / reproduction of the first and second information signals can be smoothly obtained.

  An information signal reproducing program according to the present invention includes a first and a second time-divisionally reproduced from a first and a second position on an information signal recording medium having at least a first and a second signal layer readable from one direction. Temporarily storing the second information signal in the buffer memory and outputting the information signal at the first and second transfer rates; and outputting the first and second information signals reproduced from the first and second positions in a time-division manner. 1, a step of time-divisionally transferring data to the buffer memory using one head at a constant transfer rate higher than the second transfer rate, and a transfer rate of the first and second information signals transferred from the head to the buffer memory. Is Rp, the transfer rates at which the first and second information signals are output from the buffer memory are Ra and Rb, the information unit amounts at which the first and second information signals are transferred from the head to the buffer memory are Ya and Yb, and the head is The first position The time required to move to the second position is Tab, the time required for the head to move from the second position to the first position is Tba, and the time required for the head to move from the first signal layer to the second signal layer. Assuming that the required time is Fab and the time required for the head to move from the second signal layer to the first signal layer is Fba, (Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb) And a step of reproducing the first and second information signals from the information signal recording medium by satisfying the relational expression (1). An example of the information signal reproduction program of the present invention is a reproduction program for causing a computer (system controller) to execute a reproduction flow related to FIGS. 5, 6, and 15 described later.

  In the information signal recording program according to the present invention, the first and second information signals input at the first and second transfer rates are temporarily stored in a buffer memory, and the information signal is read out from the buffer memory in a time-division manner. Information signal recording having at least first and second signal layers capable of reading the first and second information signals from one direction using a single head at a constant transfer rate higher than the first and second transfer rates Time-division recording at the first and second positions on the medium, the transfer rate of the first and second information signals to be transferred from the buffer memory to the head is Rp, and the first and second information signals are buffered. The transfer rate input to the memory is Ra, Rb, the information unit amount for transferring the first and second information signals from the buffer memory to the head is Ya, Yb, and the head moves from the first position to the second position. When it takes Is Tab, the time required for the head to move from the second position to the first position is Tba, the time required for the head to move from the first signal layer to the second signal layer is Fab, and the head is the second time Assuming that the time required to move from the signal layer to the first signal layer is Fba, the relational expression of (Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb) is satisfied, and the first and the first are satisfied. Recording the second information signal on the information signal recording medium. An example of the information signal recording program of the present invention is a recording program for causing a computer (system controller) to execute a recording flow related to FIGS. 8, 9, and 15 described later.

  Further, the information signal recording / reproducing program of the present invention records at least one of the first and second information signals and reproduces the other from at least the first and second signals readable from one direction for recording / reproduction. One information signal reproduced from a first position on an information signal recording medium having a layer is temporarily stored in a buffer memory, output at a first transfer rate, and output at a second transfer rate. Temporarily storing the information signal in the buffer memory; and transferring one of the information signals reproduced from the first position to the buffer memory at a constant transfer rate higher than the first and second transfer rates; Recording the other information signal input to the buffer memory at a second position on the information signal recording medium at a transfer rate in a time-division manner; The transfer rate of the first and second information signals input and output as Rp, the transfer rate of inputting the first information signal to the buffer memory... Ra, and the transfer rate of outputting the second information signal from the buffer memory. Rb, the information unit amount for transferring the first information signal from the buffer memory to the head from the buffer memory is Ya, the information unit amount for transferring the second information signal from the head to the buffer memory is Yb, and the head is in the second position from the first position. Tab represents the time required to move to the position, Tba represents the time required for the head to move from the second position to the first position, and Fab represents the time required to move the head from the first signal layer to the second signal layer. Assuming that the time required for the head to move from the second signal layer to the first signal layer is Fba, (Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb) Satisfies the engagement type, first the information signal recording medium, and recording reproducing the second information signal, a recording and reproducing program to be executed by Konpita. An example of the information signal recording / reproducing program of the present invention is a recording / reproducing program for causing a computer (system controller) to execute a recording / reproducing flow relating to FIGS. 11, 12 and 15 described later.

  The information recording medium of the present invention includes an information recording medium on which the information signal reproducing program of the present invention is recorded, an information recording medium on which the information signal recording program of the present invention is recorded, and the information signal recording and reproducing of the present invention. An information recording medium on which a program is recorded. The information recording medium of the present invention has a plurality of signal layers as a recording and / or reproducing medium, such as DVD-ROM, DVD-RAM, DVD-RW, DVD-R, DVD + RW, DVD + R, and HD-DVD (blue laser). And a magnetic disk, etc., as a specific example, a two-layer optical disk based on the DVD-RW standard.

  According to the information signal reproducing method of the present invention, an information signal recording method includes the steps of recording first and second information signals at first and second positions, respectively, and having at least first and second signal layers readable from one direction. Rotating the medium; temporarily storing, in a buffer memory, the first and second information signals reproduced in a time-division manner from the first and second positions on the information signal recording medium; Outputting at a transfer rate, and performing one head at a third transfer rate faster than the first and second transfer rates on the first and second information signals reproduced in a time-division manner from the first and second positions. And transferring the first information signal from the head to the buffer memory or the information unit amount for transferring the second information signal from the head to the buffer memory. Second position from first position The time required for the head to move from the second position to the first position, the time required for the head to move from the first signal layer to the second signal layer, This is a reproducing method including a step of determining based on a time required for moving from the second signal layer to the first signal layer and a relationship among the first, second, and third transfer rates. An example of the information signal reproducing method of the present invention is a method shown in a reproducing flow relating to FIGS. 5, 6, and 15 described later.

  An information signal recording method according to the present invention comprises the steps of: rotating an information signal recording medium having at least first and second signal layers readable from one direction for recording first and second information signals; , Temporarily storing the first and second information signals respectively input at the second transfer rate in the buffer memory, and converting the first and second information signals read out from the buffer memory in a time-division manner into the first and second information signals. Recording from one head to the first and second positions in a time-division manner at a third transfer rate higher than the second transfer rate, and an information unit amount for transferring the first information signal from the buffer memory to the head Alternatively, the time required for the head to move from the first position to the second position, and the time required for the head to move from the second position to the first position are determined by the information unit amount for transferring the second information signal from the buffer memory to the head. Required The time required for the head to move from the first signal layer to the second signal layer, the time required for the head to move from the second signal layer to the first signal layer, Determining based on a relationship with a third transfer rate. An example of the information signal recording method of the present invention is a method shown in a reproduction flow relating to FIGS. 8, 9 and 15 described later.

  An information signal recording / reproducing method according to the present invention includes a method for recording at least one of a first and a second information signal and reproducing the other from at least a first and a second signal layer readable from one direction for recording and reproduction. Rotating the information signal recording medium having one of the following: temporarily storing one of the information signals reproduced from the first position in a buffer memory, outputting the information signal at a first transfer rate, and inputting the information signal at a second transfer rate; Temporarily storing the other information signal in the buffer memory, and transferring the one information signal reproduced from the first position to the buffer memory at a third transfer rate faster than the first and second transfer rates. Performing the step of recording the other information signal input to the buffer memory at the second position at the transfer rate in a time-division manner; and transmitting the first information signal to the head in the buffer memory. The amount of information to be transferred, the amount of information to transfer the second information signal from the head to the buffer memory, the time required for the head to move from the first position to the second position, and the The time required for moving to the first position, the time required for the head to move from the first signal layer to the second signal layer, and the time required for the head to move from the second signal layer to the first signal layer. , Determination based on the relationship between the first, second, and third transfer rates. An example of the information signal recording / reproducing method of the present invention is a method shown in a recording / reproducing flow relating to FIGS. 11, 12 and 15 described later.

  Hereinafter, preferred embodiments of the present invention will be described in detail in the order of <first example> and <second example> with reference to FIGS. 1 to 15.

<First example>
FIG. 1 is a block diagram for explaining the overall configuration of a first example of an information signal recording and / or reproducing apparatus relating to the present invention.

  As shown in FIG. 1, in an information signal recording and / or reproducing apparatus 10A according to a first example relating to the present invention, a DVD-ROM, a DVD-RAM, a DVD-ROM having a plurality of signal layers as recording and / or reproducing media. It can be applied to RW, DVD-R, DVD + RW, DVD + R, HD-DVD (high-density DVD using a blue laser), an optical disk such as a BD standard, a magnetic disk, and the like. A case where a two-layer optical disk based on the RW standard is applied will be described.

  As shown in FIG. 1, in an information signal recording and / or reproducing apparatus (optical disk player) 10 according to a first example relating to the present invention, an optical disk (recording / reproducing from one side) is placed on a turntable 12 attached to a spindle motor 11. (A two-layer information signal recording medium) 13 that can rotate. FIG. 13 shows a two-layer disc capable of recording and reproducing both types used in this example. Type 1 is composed of a layer 0 (L0) on the back side and a layer 1 (L1) that is semi-transparent on the near side from the pickup (PU) that performs recording and reproduction. , And the two signal layers are configured such that the information recording area starts in accordance with the address increasing from the address of 30,000h.

  Type 2 is composed of a layer 0 (L0) on the back side and a layer 1 (L1) that is semi-transparent on the near side from the pickup (PU) that performs recording and reproduction. As also called an opposite, the layer 0 (L0) has an inner periphery (in). ) From the outer circumference (out) to the outer circumference (out), the information recording area is started in accordance with the address increasing from the address of 30,000h, and the layer 1 (L1) moves from the outer circumference (out) to the inner circumference (in). There is a spiral groove toward it, and the address from the layer 0 (L0) is configured to increase continuously, and is configured to be recorded according to the address. The address of the layer 1 (L1) is recorded in an increasing direction continuously from the address of the layer 0 (L0), but the numerical value may be recorded as a complement.

  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 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 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 its waveform is corrected by a waveform correcting circuit. You.

  The system controller 22 determines an instruction to start recording and / or reproduction by selecting a plurality of keys 23 and instructs the signal processing circuit 18 and the servo circuit 17. The signal read from the optical pick 14 is output by the preamplifier 16. The optical pickup 14 generates a reproduction signal, a focus error signal, and a servo signal of a tracking error signal, and the servo circuit 17 processes the focus error signal and the tracking error signal. On the other hand, a control signal for focusing and tracking is generated, and an actuator in the optical pickup 14 is driven by a driver circuit 15 to perform servo control for one round of the optical pickup 14. To move the optical pickup 14 by the feed motor in the radial direction of the optical disk 13 to reproduce the sector object of tracks. As shown in FIG. 13, in order to move the optical pickup 14 between signal layers of a disk having two recording / reproducing layers, the servo circuit 17 generates a focus error signal and a signal based on the focus error signal obtained by the preamplifier 16. Is processed to generate a focusing control signal for moving between signal surfaces of the optical disk 13, and a driver circuit 15 drives an actuator in the optical pickup 14 to control a focus jump of the optical pickup 14 (movement between signal surfaces). I do.

  The reproduction signal read out from the optical pickup 14 with one correction block as the minimum unit is used to optimize the frequency characteristic of the reproduction signal by the preamplifier 16 by the equalizer, apply PLL, and to execute the PLL bit clock and the data time. The system controller 22 has a jitter generation circuit generated by comparing the axes, and the jitter value is A / D converted and measured, and the waveform correction circuit at the time of recording is changed according to this value.

Further, the signal is converted into a digital signal by the signal processing circuit 18, for example, synchronization detection is performed, the EFM + signal on the optical disk 13 is decoded into NRZI data, error correction processing is performed in units of correction blocks, and the sector address signal and The 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, they are stored in a track buffer memory 19 using a 64-Mbit DRAM serving as a temporary storage means, with a minimum of one correction block. , And temporarily absorbs the time axis of the variable transfer rate of the first and second information signals. A signal read from the track buffer memory 19 is converted from a first information signal and a second information signal 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 as audio and video signals by a D / A converter (not shown).

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

  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 is controlled at CLV based on the speed signal. In addition, a rotation position signal of a hall element of the spindle motor 11 is fed back to the servo circuit 17 and a FG control of a constant rotation is provided from a speed signal generated from the signal. The overall control between the LSIs is performed by the system controller 22.

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

  In addition, as described later, the user can reproduce the video signal or the like recorded on the optical disc 13, record the video signal, and record the video signal currently being recorded as it is on the optical disc 13. It is configured to be able to reproduce video signals and the like in different areas. In addition, 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 currently being reproduced is being reproduced as it is. Similarly, it is configured such that video signals and the like in different areas of the optical disc 13 can be reproduced while the video signal currently being reproduced is being reproduced as it is. Similarly, it is configured such that video signals in different areas on the optical disc 13 can be recorded while the video signal currently being recorded is recorded as it is. This allows the user to enjoy functions such as simultaneous playback such as picture-in-picture and two-screen simultaneous playback, chasing playback, post-recording, and simultaneous recording of counterprograms.

  Here, in the information signal recording and / or reproducing apparatus 10A according to the first example related to the present invention, the first area based on the video information such as two movies and the audio information such as two musics is stored in different areas on the optical disc 13. The case where one optical pickup 14 records and / or reproduces the second information signal in a time-division manner via the track buffer memory 19 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 a first example of an information signal recording and / or reproducing apparatus relating to the present invention, in which the first and second areas on an optical disk and the first and second areas on a track buffer memory are arranged. 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, 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 disc 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). The second area 13b is an area for recording a second information signal B having a recording capacity Yb as a minimum unit for recording and reproduction (for example, an address B1 area in FIG. 4). 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. Here, the first area 13a and the second area 13b on the optical disc 13 may be on L0 of the signal layer of the optical disc 13 as shown in FIG. Alternatively, the first area 13a of the optical disc 13 may be on L0 of the signal layer, and the second area 13b may be on L1 of the signal layer, or vice versa. This relationship is the same for FIGS. 3, 7, and 10 described later.

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

  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-division manner. , The transfer rate Rp to the first and second information signals A and B is set to be constant, and the constant transfer rate Rp is, for example, 25 Mbps. The transfer rate Rp of the one optical pickup 14 to the first and second information signals A and B is a value faster than the transfer rates Ra and Rb of the first and second information signals A and B described later. Is set.

  Further, 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 a transfer rate Ra, The transfer rate of the second information signal B is defined as 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 the user in image quality priority (transfer rate priority), for example, 8 Mbps and 4 Mbps shown in a to c below. , 2 Mbps mode.
a. A mode with a recording rate of 2 Mbps at a transfer rate for high image quality of, for example, 8 Mbps,
b. Mode with a recording time of 4 Mbps at a transfer rate for high image quality, for example, 4 Mbps,
c. Mode of recording time of 8 Mbps at 2 Mbps at a transfer rate for normal image quality,
Are prepared, and when recording on the optical disk 13, the mode is designated by a key input by the user, so that the transfer rates Ra and Ra of the first and second information signals A and B are set.
While Rb is 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 disc 13, and the first and second compression rates are read according to this value. It is assumed that transfer rates Ra and Rb of information signals A and B are set.

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

  As a different embodiment, as described above, the first and second areas 19a and 19b in the track buffer memory 19 are divided by the values of the transfer rates Ra and Rb of the first and second information signals A and B. Instead, the data is divided according to the recording mode or the reproduction mode. For example, 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 (A) is recorded. Although the continuity is not a major problem even if the continuity is impaired, if the recording signal cannot be recorded continuously, it will be a fatal defect. Occupy a lot. 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 information signals A and B are divided under the condition that the first and second areas 19a and 19b in the track buffer memory 19 are divided according to the transfer rates Ra and Rb. An information signal reproducing apparatus to which the mode of reproducing from the optical disc 13 is applied; an information signal recording apparatus to which the mode of recording the first and second information signals A and B on the optical disc 13 is applied; An information signal recording / reproducing apparatus to which one of A and B is reproduced from the optical disk 13 and the other is recorded on the optical disk 13 will be described in order with reference to FIGS.

<Information signal reproducing device>
FIG. 3 schematically shows an information signal reproducing apparatus to which the first and second information signals are reproduced from an optical disk, and FIG. 4 shows addresses of first and second areas on the optical disk. FIG. 5 and FIG. 5 are flowcharts showing a state where the first and second information signals are reproduced from the optical disk, and FIG. 6 is a timing chart showing a state where the first and second information signals are reproduced from the optical disk.

  As shown in FIG. 3, the optical disc 13 is formed only for reproduction, and on this optical disc 13, a first information signal A having a recording capacity Ya is pre-recorded in a first area 13a. The second information signal B having Yb is recorded in the second area 13b in advance. Here, the first area 13a and the second area 13b on the optical disk 13 may be on the signal layer L0 of the optical disk 13 as shown in FIG. The first area 13a of the optical disc 13 may be on L0 of the signal layer and the second area 13b may be on L1 of the signal layer, or vice versa. Good.

  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, A2, A3,. Thus, the first information signals A are separately recorded. Similarly, 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 kept, 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, the optical pickup 14 has a capacity of 0.1 mm. The seek time of the optical pickup 14 that moves between the first information signal A and the second information signal B to be reproduced next is set to a range in which the optical pickup 14 can move within 5 seconds. The maximum is within 0.5 seconds.

  When the optical disc 13 is reproduced, the optical pickup 14 moves to a predetermined reproduction track, waits for a start sector, and starts recording from the control data of the first and second information signals A and B recorded in the reproduction signal. , And the storage capacity areas of the first area 19a and the second area 19b in the 64 MB track buffer memory 19 connected to the signal processing circuit 18 (FIG. 1) are separated according to this value. In addition, the EMPTY value and the FULL value of each of the regions 19a and 19b are set.

  Here, the optical pickup 14 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 on a time division basis. The first information signal A obtained by alternately reproducing and reproducing is stored in the first area 19a in the track buffer memory 19, and the second information signal B obtained by reproducing is stored in the track buffer memory 19. Are temporarily stored alternately at a constant transfer rate Rp (for example, 25 Mbps) in a time-division manner in the second area 19b. At this time, the transfer rate to the first and second information signals A and B by the optical pickup 14 is the same as the transfer rate when the first and second information signals A and B temporarily stored in the track buffer memory 19 are output. 1, set faster than the second transfer rate.

  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 sets 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 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 device will be described with reference to FIGS. In FIG. 6, 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.

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

  Next, in step S32, it is confirmed whether or not the optical pickup 14 has reached the first address area A1 (target position) in the first area 13a, which is a place where reproduction is desired on the optical disc 13. Here, if the address area A1 (target position) has not been reached, step S32 is further continued. If the address area A1 (target position) has been reached, the process proceeds to the next step S33.

  Next, in step S33, the optical pickup 14 starts reproduction from the first address area A1 in the first area 13a, and transmits the first information signal A to the first information signal A 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 performs 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, 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. The operation is continued, and when the EMPTY value is 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 side at the transfer rate Ra, so that the EMPTY value and FULL are set as shown in FIG. 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 are read out from the first area 19a to the AV-ENDEC 20 side between the values. The first information signal A is temporarily stored in the first area 19a while increasing with the slope of the difference (Rp-Ra) of the transfer rate Ra.

  Next, in step S36, 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. When the FULL value is reached, the process proceeds to the next step S37.

  Next, in step S37, 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 to the first area 13a on the optical disk 13. The reproduction in the first 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 transferred to the AV-ENDEC 20 at the transfer rate Ra. As will be apparent from FIG. 6, the read operation may be completed before the period up to the EMPTY value is reached before the reproduction of the second address area A2 in the first area 13a is started.

  Next, in step S38, the optical pickup 14 moves to the first address area B1 in the second area 13b on the optical disc 13 to be reproduced next. At this time, the seek time Tab during which the optical pickup 14 moves 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 the same between the signal planes. Within about 0.5 seconds at the maximum.

  Generally, the first area 13a and the second area 13b on the optical disk 13 are located on the signal layer L0 of the optical disk 13 as shown in FIG. In this case, the movement is within the same signal plane. However, in the case where the first area 13a of the optical disc 13 is on L0 of the signal layer and the second area 13b is on L1 of the signal layer, or vice versa, the above-described seek time Tab causes the inter-layer A time Fab for performing a focus jump for moving the focus of the pickup is added.

  This will be generally described with reference to FIG. In FIG. 15, type 1 movement indicates a procedure for recording or reproducing a signal on one signal layer in a single-layer disc or a two-layer disc of the parallel disc in FIG. Before and after the description, in the reproduction of the signal layer L1 of the two-layer disc, the first information signal A corresponding to the flowchart of FIG. 5 is reproduced from the area 13a in step S33, and then the second information signal A is reproduced in step S38. Is moved to the area 13b. Next, the second information signal B is reproduced in the area of 13b in step S40, and then moved to the 13a1 area of the first information signal A to be reproduced next in step S45.

  Next, the movement of type 2 in FIG. 15 shows a procedure for recording or reproducing a signal on two signal layers of the signal layer L0 and the signal layer L1 in the two-layer disc of the opposite disc of FIG. In the reproduction of the signal layer L0 and the signal layer L1 of the dual-layer disc, reproduction is performed in step S33 from the area of the first information signal A 13a of the signal layer L0 corresponding to the flowchart of FIG. 5, and then in step S38. The second information signal B is moved to the vicinity of the position corresponding to the area 13b, and the focus jumps from the signal layer L0 to the signal layer L1 in the focus direction in step S38a, and moves to the area 13b of the second information signal B. I do. Next, the second information signal B of the signal layer L1 is reproduced in the area of 13b in step S40, and then in step S45 corresponding to the 13a1 area of the first information signal A of the signal layer L0 to be reproduced next. Then, in step S45a, the focus jumps from the signal layer L1 to the signal layer L0 in the focus direction in the focus direction, and moves to the area of the first information signal 13a1 to be reproduced next. As described above, in the case of movement across two signal layers with respect to movement within one signal layer, the time used for recording or reproducing a signal is increased by adding time to move between signal layers. Will be different. The time required to actually perform a focus jump from the signal layer to a different signal layer in the focus direction in the focus direction is about 0.2 seconds at maximum including the stabilization time (the actual jump time between signal layers ends in several to several tens of msec. When the tracking pull-in time, the time required to correct the eccentricity when the eccentricity is different between the signal layers, the retry time, the rotation waiting time, and the like, a margin of about 0.2 seconds is required at worst. ), And the seek time within the same signal plane is a time that cannot be ignored even when compared to a maximum of about 0.5 seconds.

  Similarly, in the examples in the following description, similarly, there are a case of recording or reproduction processing in one signal layer and a case of recording or reproduction across two signal layers. The detailed description will be omitted because it is performed in the same manner as the description.

  Next, in step S39, it is checked whether the optical pickup 14 has reached the address area B1 (target position) of the second area 13b on the optical disc 13. Here, if the address area B1 (target position) has not been reached, step S39 is further continued. If the address area B1 (target position) has been reached, 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 disc 13, and transmits the second information signal B at the transfer rate Rp to the track buffer memory 19. Is temporarily stored in the second 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.

  Next, in step S41, 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. The operation is continued, and when the EMPTY value is 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 side at the transfer rate Rb, so that the EMPTY value and FULL are output as shown in FIG. 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 between the values. The second information signal B is temporarily stored in the second area 19b while increasing with the slope of the difference (Rp-Rb) of the transfer rate Rb.

  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 reaches 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 moves to the second area 13b on the optical disk 13. Reproduction in the address area B1 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 at the transfer rate Rb. As will be apparent from FIG. 6, this reading operation may be completed before the period up to the EMPTY value is reached before the reproduction of the second address area B2 in the second area 13b is started.

Next, in step S45, the optical pickup 14 moves to the second address area A2 in the first area 13a on the optical disc 13 to be reproduced next. (When moving to a different signal layer, a focus jump S45a is additionally provided.) At this time, the optical pickup 14 moves from the first address area B1 to the first area 13a in the second area 13b on the optical disc 13. The seek time Tba for moving to the second address area A2 is within 0.5 seconds at the maximum. (When moving to a different signal layer, when the focus jump S45a is added, the seek time Tba + the focus jump time is within a maximum of 0.2 seconds, and the total is within a maximum of 0.7 seconds.)
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 S32 and the same is repeated thereafter, and the first and second information signals A and B are output by the optical pickup 14. Can be successively and alternately reproduced in the order of address areas A1, B1, A2, B2, A3, B3,.

  In addition, the flow of stopping all the reproduction by the optical pickup 14 may be inquired after the step 37 or after the step 44, but the operation is complicated, and therefore, it is omitted here.

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

  Here, when the first information signal A and the second information signal B are simultaneously reproduced from the optical disc 13 in a time-division manner via the track buffer memory 19, the first information signal A and the second information signal B in the track buffer memory 19 are reproduced. How to control reproduction, recording and reproduction, and recording of two signals will be described by taking writing and reading in the second areas 19a and 19b as an example.

  First, the relevant variables are defined as follows:

Read transfer rate when reading the first and second information signals A and B from the optical pickup 14 to the track buffer memory 19... Rp (Mbps)
Average transfer rate for reading the first information signal A from the first area 19a of the track buffer memory 19 to the AV-ENDEC 20 side Ra... Ra (Mbps)
Average transfer rate Rb ... Rb (Mbps) for reading the second information signal B from the second area 19b of the track buffer memory 19 to the AV-ENDEC 20 side
Required minimum storage capacity of the track buffer memory 19: Ym (Mbit)
Reproduction information unit amount when reading out the first information signal A recorded in the first area 13a on the optical disc 13 ... Ya (Mbit)
Reproduction information unit amount when reading out the second information signal B recorded in the second area 13b on the optical disc 13 ... Yb (Mbit)
Seek time required for the optical pickup 14 to move from the first area 13a to the second area 13b in one signal plane on the optical disk 13... Tab (s)
Seek time required for the optical pickup 14 to move from the second area 13b in one signal plane on the optical disc 13 to the first area 13a ... Tba (s)
Seek (focus jump) time required for the optical pickup 14 to move from the first area 13a to the second area 13b on a different signal surface on the optical disk 13... Fab (s)
Seek (focus jump) time required for the optical pickup 14 to move from the second area 13b of the different signal surface on the optical disc 13 to the first area 13a ... Fba (s)
Here, the seek time Tab (Tba) means that the reproduction is stopped at the reproduction end position of the information signal A (B) in the area 13a (13b) in one signal plane on the optical disc 13, and the next area 13b (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), and prepares for reproduction. It indicates the time obtained by adding the time until the reproduction of the next information signal B (A) is started.

  In the case of a seek performed between two signal layers, a focus jump time Fab for moving between signal surfaces on the optical disc 13 is added to the seek time Tab (Tba) as shown in FIG.

As a basic idea, the track buffer memory 19 has a transfer rate Rp at which the first and second information signals A and B reproduced from the optical disc 13 by the optical pickup 14 in a time-division manner are stored in the track buffer memory 19. The average transfer rate Ra for reading the first information signal A from the first area 19a to the AV-ENDEC 20 side and the second information signal B from the second area 19b of the track buffer memory 19 to the AV-ENDEC 20 side The sum with the average transfer rate Rb to be read must not exceed this.
Expressing this as an equation,
Rp> Ra + Rb (1 formula)
It becomes.

Next, a reproduction time Ta (s) in which the optical pickup 14 reproduces (writes) the first information signal A from the optical disk 13 to the track buffer memory 19 is as follows:
Ta = Ya / Rp (2 formulas)
The reproduction time Tb (s) in which the optical pickup 14 reproduces (writes) the second information signal B from the optical disk 13 to the track buffer memory 19 is:
Tb = Yb / Rp (3 equations)
It is.

Further, a transfer rate Rp for reading out the first and second information signals A and B from the optical disk 13 by the optical pickup 14, a transfer rate Ra of the first information signal A and a second information signal B based on the transfer rate Rp. Is calculated by subtracting the transfer rate Rb from
Rp / (Rp-Ra-Rb) ... (4 formulas)
far.
This (Equation 4) is a ratio between the maximum transfer rate at the time of reading and the transfer rate for a margin.

On the other hand, the time corresponding to 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 (for example, the section (A1, Tab, B1, Tba in FIG. 6)) Although only one signal plane is shown as one cycle), the case between two signal planes is applied to FIGS. 15 to 6, and the section of Tab corresponds to Tab + Fab, and the section of Tba corresponds to Tba + Fba. The same applies to the following examples.) And the ratio of the total seek time during this one cycle period to
In the case of one signal plane,
(Ta + Tab + Tb + Tba) / (Tab + Tba) (Equation 5)
In the case between two signal planes,
(Ta + Tab + Fab + Tb + Tba + Fba) / (Tab + Tba + Fab + Fba) (5a formula)
far.

  In this one cycle, in addition to the reproduction time of the first and second information signals A and B and the total seek time between the two points, for example, the limit state where there is no extra (standby) time such as the time during which the pickup waits is set. Suppose.

  At this time, since only the time corresponding to the transfer rate of the transfer rate of the medium minus the transfer rate of the reproduction signal is the time during which the pickup can be moved from the signal surface of the medium, this equation (4) and ( (Equation 5) means the ratio between the maximum transfer rate Rp at the time of reading and the margin of the transfer rate (Equation 4), the time for one cycle, and the margin during which the signal is not reproduced from the disk during the one cycle. The ratio (expression 5) to the total seek time between two points, which is time, (expression 5a) can be set equal.

Total transfer rate / margin transfer rate = 1 cycle time / margin time (seek time)
In the case of one signal plane,
Rp / (Rp-Ra-Rb) = (Ta + Tab + Tb + Tba) / (Tab + Tba) (6)
In the case between two signal planes,
Rp / (Rp-Ra-Rb) = (Ta + Tab + Fab + Tb + Tba + Fba) / (Tab + T
ba + Fab + Fba) (6a formula)
By transforming this (Equation 6),
Rp / (Rp-Ra-Rb) = 1 + (Ta + Tb) / (Tab + Tba) (Formula 6-1)
Rp / (Rp-Ra-Rb) -1 = (Ta + Tb) / (Tab + Tba) (Equation 6-2)
(Rp-Rp + Ra + Rb) / (Rp-Ra-Rb) = (Ta + Tb) / (Tab + Tba) ...
(Equation 6-3)
(Ra + Rb) / (Rp-Ra-Rb) = (Ta + Tb) / (Tab + Tba) (Equation 6-4)
(Ta + Tb) = (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
… (Equation 7)
It becomes.

Similarly, when this equation (6a) is transformed,
(Ta + Tb) = (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
... (7a type)
It becomes.
By substituting (2) and (3) into (7),
(Ya + Yb) = Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (8)
It becomes.

Similarly, by substituting (2) and (3) into (7a),
(Ya + Yb) = Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb) (Formula 8a)
It becomes.
The meaning of this equation is that when two signals of a transfer rate Ra (signal A) and a transfer rate Rb (signal B) are simultaneously and continuously reproduced in a time-division manner at a constant transfer rate Rp from the optical disc, If the seek time between the two signal positions is Tab + Tba (Tab + Tba + Fab + Fba), the information amount to read out the signals A and B from the optical disk at one time is Ya + Yb.

  This is based on the above-mentioned limit state, but in order to have a margin, it can be considered as follows.

  In the above equation (Equation 8), the transfer rate Rp between the optical disk 13 and the track buffer memory 19 is constant based on the specification of the disk and the specifications of the apparatus. This is equivalent to changing the number, and cannot be finely changed in a short time depending on the type of the transfer rate of the reproduction signal.

  Further, 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 recorded on the optical disk 13, and also determined by the user or the like during recording. You.

  Further, the seek times Tab, Tba (Fab, Fba) are determined by the respective address positions (physical distance relationship) on the optical disc 13 to be reproduced and the mechanical specifications of the apparatus. Therefore, in order to satisfy the reproduction control stably with a margin, only the left side is the only variable in the apparatus in the case where the recording / reproduction is substantially performed. The information amount Ya of the first information signal A and the information amount Yb of the second information signal B, which are the minimum amounts of information to be read at once from the optical disk, must satisfy the following equations (9) and (9a). Must.

That is, in the case of one signal plane,
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (Equation 9)
In the case of two signal layers,
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb) (Formula 9a)
In order to make this (Equation 9) easier to understand, it is modified.

(Ya + Yb) ≧ (Ra + Rb) × (Tab + Tba) × Rp / (Rp−Ra−Rb) (Formula 9-1)
This is obtained by multiplying the transfer rate ratio Rp / (Rp-Ra-Rb) by a seek time (Tab + Tba) corresponding to a margin time and further multiplying the transfer rate (Ra + Rb) of a signal to be reproduced. It means that the required amount of information
(Tab + Tba) × Rp / (Rp−Ra−Rb) = Kp (Equation 9-2)
Assuming that Kp is a coefficient such as a signal transfer rate,
(Ya + Yb) ≧ (Ra + Rb) × Kp (Equation 9-3)
It becomes.

In this (Equation 9-3), even if Ra and Rb change within a certain range of Ra + Rb, the value of Kp does not change. Since the information amount Ya is proportional to Ra for continuous reproduction and the information amount Yb is proportional to Rb for continuous reproduction, the minimum information amount Ya and the minimum information amount Yb are determined by the transfer rate Ra. As a relationship of the transfer rate Rb,
Ya: Yb = Ra: Rb (Equation 9-4)
It becomes.
Substituting this relationship into (9-3) gives, independently,
Ya ≧ Ra × Kp (Equation 9-5)
Yb ≧ Rb × Kp (Equation 9-6)
Can be obtained.

Substituting (Equation 9-2) and reverting this,
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb) (Equation 10)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb) (Equation 11)
It becomes.

Similarly,
Ya ≧ Rp × Ra × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb) (10a formula)
Yb ≧ Rp × Rb × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb) (Formula 11a)
It becomes.

Therefore, (Equation 10) and (Equation 11) are simultaneously satisfied along with (Equation 9).
In addition, (10a) and (11a) are simultaneously satisfied with (9a).

  Here, equation (9) can be mathematically derived from equations (10) and (11), but equations (10) and (11) cannot be mathematically derived from equation (9). Also, although (9a) can be mathematically derived from (10a) and (11a), (10a) and (11a) cannot be mathematically derived from (9a).

  The meaning of this equation is that in the case of one signal plane, reproduction of two signals of the transfer rate Ra (signal A) and the transfer rate Rb (signal B) from the optical disc at a constant transfer rate Rp is performed in a time-division manner. If the seek time between the two signal positions is set to Tab + Tba, the amount of information to read out the signal A and the signal B from the optical disk at one time is equal to or more than Ya + Yb, and is equal to or more than Ya and Yb, respectively. Is read out.

  Similarly, when recording is performed, recording is performed in an area of Ya + Yb or more, which indicates that continuous recording cannot be performed unless there is a free area of Ya or more and Yb or more.

  In the case of two signal layers, when two signals of a transfer rate Ra (signal A) and a transfer rate Rb (signal B) are simultaneously and continuously reproduced in a time-division manner at a constant transfer rate Rp from the optical disc, If the seek time (total movement time) between two signal positions is Tab + Tba + Fab + Fba, the amount of information to be read at a time from the optical disk for signal A and signal B is Ya + Yb or more. It shows that it is good.

  Similarly, when recording is performed, recording is performed in an area of Ya + Yb or more, which indicates that continuous recording cannot be performed unless there is a free area of Ya or more and Yb or more.

In the control of recording / reproducing, the expression (9) must be satisfied in one signal plane, the expression (9a) must be satisfied between two signal layers, and if the expression (9a) is satisfied, one signal must be satisfied. Since the case in the plane can be satisfied, the recording and reproduction are controlled so as to always satisfy the expression (9a). This has the advantage that control can be performed easily. As another example, if control is performed so as to satisfy (Equation 9a) in one signal plane, the memory buffer area is wasted in control in one signal plane. From the signal layer information based on the address information at the time of recording / reproducing, the equations (9) and (9a) are respectively used for control within one signal plane and control between two signal layers. In this case, there is an advantage that the area of the memory buffer can be effectively used without wasting the area of the memory buffer in the case of control within one signal plane.

Calculation is performed using real values for (Equation 9) and (Equation 9a).
If Rp = 22 Mbps, Ra = 10 Mbps, Rb = 10 Mbps, Tab = 0.5 s, Tba = 0.5 s, Fab = 0.2 s, and Fba = 0.2 s,
In the case of one signal plane,
(Ya + Yb) ≧ 22 × (10 + 10) × (0.5 + 0.5) / (22−10−10) = 220 Mb (9r formula)
In the case of two signal layers,
(Ya + Yb) ≧ 22 × (10 + 10) × (0.5 + 0.5 + 0.2 + 0.2) / (22−10−10) = 308 Mb (9ar formula)
In the case of one signal plane, the amount of information that must be reproduced at once from the medium is (Ya + Yb) = 220 Mb, whereas in the case of two signal layers, (Ya + Yb) = 308 Mb. It can be seen that the value is not sufficiently negligible.

  In the present embodiment, the description is made between the signal surfaces of a two-layer optical disk. However, it goes without saying that the same applies to an optical disk having three or more signal layers as described above. Note that a specific method of moving between signals (focus jump) can be realized by using the method described in Japanese Patent Application Laid-Open No. 10-283640 of the present applicant.

Next, the basic minimum storage capacity Ym required by the track buffer memory 19 is, in the case of one signal plane, from when the buffer of the first information signal A shown in FIG. 6 changes from FULL to EMPTY. (Tb + Tab + Tba) × Ra (Equation 12-1)
Capacity (Ta + Tab + Tba) × Rb until the buffer of the second information signal A changes from FULL to EMPTY (Equation 12-2)
Must exceed the sum of
Ym> (Tb + Tab + Tba) × Ra + (Ta + Tab + Tba) × Rb (Equation 12)
It becomes.

In the case between the two signal planes, the capacity (Tb + Tab + Tba + Fab + Fba) from the time when the buffer of the first information signal A shown in FIG. 6 changes from FULL to EMPTY × Ra (Equation 12-1a)
Capacity (Ta + Tab + Tba + Fab + Fba) × Rb until the buffer of the second information signal A changes from FULL to EMPTY (Equation 12-2a)
Must exceed the sum of
Ym> (Tb + Tab + Tba + Fab + Fba) × Ra + (Ta + Tab +
Tba + Fab + Fba) × Rb (12a formula)
It becomes.

Alternatively, the capacitance Ta × (Rp−Ra) until the buffer of the first information signal A shown in FIG. 6 changes from EMPTY to FULL (Equation 13-1)
Capacity Tb × (Rp−Rb) from the time when the buffer of the first information signal A shown in FIG. 6 changes from EMPTY to FULL (Equation 13-2)
Must exceed the sum of
Ym> Ta × (Rp−Ra) + Tb × (Rp−Rb) (Equation 13)
It becomes.

Equation (12) is obtained by substituting Equations (2), (3), (10) and (11) as equations,
Ym> (Yb / Rp + Tab + Tba) × Ra + (Ya / Rp + Tab + Tba) × Rb (Equation 12-3)
Ym> (Yb / Rp) × Ra + (Ya / Rp) × Rb + (Tab + Tba) × (Ra + Rb) (Equation 12-4)
Ym> 2 × Ra × Rb × (Tab + Tba) / (Rp−Ra−Rb) + (Tab + Tba) × (Ra + Rb) (Equation 12-5)
Ym> (2 × Ra × Rb / (Rp−Ra−Rb) + (Ra + Rb)) × (Tab + Tba) (Equation 12-6)
Ym> (2 × Ra × Rb + (Ra + Rb) / (Rp−Ra−Rb)) × (Tab + Tba) / (Rp−Ra−Rb) (Equation 12-7)
Ym> ((Rp−Ra) Ra + (Rp−Rb) Rb) × (Tab + Tba) / (Rp−Ra−Rb) (12-8 formula)
It becomes.

Similarly, the above equation (13) substitutes the above equations (2), (3), (10) and (11) as equations,
Ym> Ya / Rp × (Rp−Ra) + Yb / Rp × (Rp−Rb) (Equation 13-3)
Ym> ((Rp-Ra) Ra + (Rp-Rb) Rb) × (Tab + Tba) / (Rp-Ra-Rb) (Equation 13-4)
After all, (12) and (13) are equivalent,
Ym> {(Rp−Ra) × Ra + (Rp−Rb) × Rb} × (Tab + Tba) / (Rp−Ra−Rb) (Equation 14)
It becomes.
Derivation is also omitted in the case between two signal planes,
Ym> {(Rp−Ra) × Ra + (Rp−Rb) × Rb} × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb) (Formula 14a)
Therefore, in one signal plane, the first area 19a of the track buffer memory 19 for the first information signal A is (Rp−Ra) × Ra × (Tab + Tba) / (Rp−Ra−Rb). The EMPTY value and the FULL value are determined in this range while securing the above, 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 is determined and the EMPTY value and the FULL value are determined in this range, whereby a continuous reproduction operation or recording operation can be realized.

  In the case between two signal planes, the first area 19a of the track buffer memory 19 for the first information signal A is equal to or more than (Rp-Ra) * Ra * (Tab + Tba + Fab + Fba) / (Rp-Ra-Rb). The EMPTY value and the FULL value are determined within 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 + Fab + Fba) / (Rp -Ra-Rb) or more and determining the EMPTY value and the FULL value in this range makes it possible to realize a continuous reproducing operation or recording operation.

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

  Here, in this example, the track buffer memory 19 is a 64 MB track buffer memory 19 connected to the signal processing circuit 18 of FIG. 1, but of course the 64 MB connected to the AV-ENDEC 20 of FIG. A part of the buffer memory 21 may be similarly used as a track buffer memory, or both buffer memories may be used effectively, and these may be used adaptively according to the use condition of each buffer memory. It doesn't matter.

  That is, the track buffer memory 19 absorbs the difference between the transfer rate of the reproduced signal to the information signal recording medium such as the optical disk 13 by the optical pickup 14 and the transfer rate of the compressed and expanded signal such as video. However, in the present example, the recording required by the first information signal A and the second information signal B is particularly performed using the 64 MB track buffer memory 19 connected to the signal processing circuit 18 of FIG. 1 as an example. By dividing the capacity of one track / buffer memory 19 and allocating the surplus area as a result of the calculation at that ratio, the capacity of each track buffer can be increased.

  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, and Assuming that 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 for the second information signal A is 16 MB, the remaining area is 64 MB. The remaining 16 MB is not left over but is divided into 2 to 1 by about 10 MB to 5 MB, 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 is By setting the storage capacity of the second area 19b to 16 MB + 5 MB = 21 MB, the track buffer memory 19 is enabled. It can be used. As a result, processing such as simultaneous recording and reproduction of two continuous information signals A and B can be realized.

In addition, during normal reproduction of any one of the information signals A or B, the entire 64 MB of the track buffer memory 19 is used as one track buffer. In this process, the system controller 22 that manages the reproduction secures the first and second areas 19a and 19b in the track buffer memory 19 according to the reproduction instruction. Thereby, it is possible to improve the playability such as the retry in the normal reproduction operation. The timing of division of the first and second areas 19a and 19b is determined by confirming the data in the track buffer memory 19 at the time when the reproduction input is instructed. It is performed when it is confirmed that there is not. At this timing, when the transfer rates Ra and Rb of the information signals A and B to be reproduced are changed during the reproduction processing, data in the track buffer memory 19 is similarly confirmed. This is performed when it is confirmed that there is no intermediate data during playback recording. Thus, the margin of the track buffer memory 19 can be optimized in real time when the transfer rates Ra and Rb of the information signals A and B are changed.

Here, in the case of the read-only optical disk 13, the maximum allowable time Tmax = (Tab · max), (Tba · ma) of the seek time Tab, Tba by the optical pickup 14 suppresses variations among manufacturers. In this case, it is assumed that both the maximum allowable times (Tab.max) and (Tba.max) are the same value and are set to 0.5 second in the recording type optical disc 13 for DVD, for example. .
Applying this to the above condition (Equation 9),
In one signal plane,
(Ya + Yb) ≧ Rp × (Ra + Rb) × 2 × Tmax / (Rp−Ra−Rb) (Equation 19)
By substituting Tmax = 0.5 seconds into this (Equation 19),
(Ya + Yb) ≧ Rp × (Ra + Rb) / (Rp−Ra−Rb) (20)
The first and second regions having recording capacities Ya and Yb in the first and second regions 13a and 13b on the optical disk 13 so as to satisfy the condition of (Equation 19) or (Equation 20), respectively. It is sufficient that the information signals A and B are recorded in advance.

Similarly, in the case between two signal surfaces, in addition to the above, the maximum allowable time Fmax = (Fab · max) and (Fba · max) of the focus jump times Fab and Fba by the optical pickup 14 are different between manufacturers. In this case, the maximum allowable time (Fab.max) and (Fba.max) are the same, and are set to, for example, 0.2 second in the recordable optical disc 13 for DVD. Suppose
Applying this to the above-described condition (formula 9a),
(Ya + Yb) ≧ Rp × (Ra + Rb) × 2 × (Tmax + Fmax) / (Rp−Ra−Rb) (19a formula)
By substituting Tmax = 0.5 seconds and Fmax = 0.2 seconds into the equation (19a),
(Ya + Yb) ≧ 1.4 × Rp × (Ra + Rb) / (Rp−Ra−Rb) (20a formula)
The recording capacities Ya and Yb are respectively stored in the first and second areas 13a and 13b of the respective signal surfaces on the optical disk 13 so as to satisfy the condition of (19a) or (20a). The first and second information signals A and B may be recorded in advance.

<Information signal recording device>
FIG. 7 is a diagram schematically showing an information signal recording apparatus to which an embodiment in which first and second information signals are recorded on an optical disk, and FIG. 8 shows a state in which the first and second information signals are recorded on an optical disk. FIG. 9 is a timing chart showing a state in which the first and second information signals are recorded on the optical disc.

  The information signal recording device has the same technical idea as the information signal reproducing device described above, and the input / output relationship is opposite to that of the information signal reproducing device.

  As shown in FIG. 7, the information signal recording apparatus is configured to input the first and second signals inputted 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 information signals A and B of the first and second areas 13a and 13b (signals of two layers) on the optical disc 13 are transferred by the optical pickup 14 at a constant transfer rate higher than the first and second transfer rates Ra and Rb. In the case of recording on a surface, the recording operation is performed in a time-division manner (moved by the focus jump between the signal surfaces as described above).

  That is, the optical disc 13 is formed so as to be recordable / 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 13a having a recording capacity Yb are provided. A second area 13b (the first area 13a and the second area 13b may be divided into two layers of signal surfaces) for recording the information signal B is 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. Addresses A1, A2, A3,... Are provided for each area, 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 areas within a range in which a seek time described later can be maintained, and addresses B1, B2, B3,... Each can be divided and recorded. Also in this case, the capacity of each address area A1, A2, A3,... Matches the recording capacity Ya, and the capacity of each address area B1, B2, B3,.
At this time, the optical pickup 14 has the same signal surface 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. Within the range, a range within which movement is possible within 0.5 seconds is set. When moving to a different signal layer, a range within which movement is possible by adding 0.2 seconds to the signal layer is set. The seek time of the optical pickup 14 moving between the first information signal A and the second information signal B to be recorded next is within 0.5 seconds at the maximum (0.7 seconds between two signal surfaces). is there.

  When recording on the optical disc 13, the MPEG encoder in the AV-ENDEC 20 operates in a recording mode in which the user specifies transfer rates Ra and Rb of the first and second information signals A and B (a transfer rate of 8 Mbps for high image quality, The transfer rate can be set by a transfer rate of 4 Mbps for a slightly higher image quality and a transfer rate of 2 Mbps for a normal image quality, and the first and second information signals A and B to be recorded are transmitted from the AV-ENDDEC 20 to the signal processing circuit 20 (FIG. 1) is 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 set in a standby state to set a predetermined track on the optical disc 13 to be recorded. Waiting for the kick. If the capacity of each area 19a, 19b of the track buffer memory 19 becomes a 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 information 19b stored in the second area 19b of the track buffer memory 19 are added with a correction code, an address and a sync signal. 2 is read alternately in a time-division manner, and the first information signal A read by the optical pickup 14 at a constant transfer rate Rp is stored in the first area 13a on the optical disc 13 as the second information signal. B are alternately recorded in the second area 13b on the optical disc 13 in a time-division manner. By repeating this, continuous recording is performed.

  Here, the operation of the information signal recording device will be described with reference to FIGS. In FIG. 9, the transfer rates Ra and Rb of the first and second information signals A and B are shown at the same transfer rate for convenience of illustration, but show the same tendency even when both are different. is there.

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

  Next, in step S52, it is checked whether or not the optical pickup 14 has reached the first address area A1 (target position) in the first area 13a where recording is to be performed on the optical disc 13. Here, if the address area A1 (target position) has not been reached, step S52 is further continued. If the address area A1 (target position) has been reached, the process proceeds to the next step S53.

  Next, in step S53, the first information signal A sent from the AV-ENDEC 20 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. It is stored at the transfer rate Ra.

  Next, in step S54, 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 not, the process proceeds to step S53. The operation is continued, and when the FULL value is reached, the process proceeds to the next step S55.

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

  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 EMPTY value. When the value reaches the EMPTY value, the process proceeds to the next step S57.

  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 moves to the first area 13a on the optical disk 13. The recording in the first address area A1 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 to the first area 19a in the track buffer memory 19 at the transfer rate Ra. However, as is clear from FIG. 9, the write operation may be completed before the period up to the FULL value is reached before recording of the second address area A2 in the first area 13a is started.

  Next, in step S58, the optical pickup 14 moves to the first address area B1 in the second area 13b on the optical disc 13 to be recorded next (when moving to a different signal layer, the focus jump is performed as described above. To move between signal planes). At this time, a seek time Tab (see FIG. 9 (FIG. 9)) in which the optical pickup 14 moves 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. , FIG. 12 is similar), only Tab and Tba are described as seek times, but when moving to a different signal layer, the time relationship including the Fab and Fba of the focus jump is shown as described above.) And within 0.5 seconds (at most 0.7 seconds when moving to a different signal layer).

  Next, in step S59, 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 disc 13. Here, if the address area B1 (target position) has not been reached, this step S59 is further continued. If the address area B1 (target position) has been reached, the process proceeds to the next step S60.

  Next, in step S60, the second information signal B sent from the AV-ENDEC 20 at the transfer rate Rb is temporarily stored at the transfer rate Rb until reaching the FULL value in the second area 19b of the track buffer memory 19. It is memorized.

  Next, in step S61, it is asked whether the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the FULL value. If the second information signal B has not reached the FULL value, the process proceeds to step S60. The operation is continued, and when the FULL value is reached, the process proceeds to the next step S62.

  Next, in step S62, when the second information signal B becomes the FULL value, the second information signal B 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 second information signal B is reduced by the gradient of the difference (Rp-Rb), and the second information signal B is transferred by the optical pickup 14 to the second information signal B on the optical disk 13 at a constant transfer rate Rp. It is recorded in the area 13b.

  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. When the value reaches the EMPTY value, the process proceeds to the next step S64.

  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 moves to the second area 13b on the optical disk 13. Stop recording in the address area B1. 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, the 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 optical pickup 14 moves to the second address area A2 in the first area 13a on the optical disc 13 to be recorded 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 disc 13 to the second address area A2 in the first area 13a is 0.5 at the maximum. Within seconds. 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 S52 and the same is repeated thereafter, and the optical pickup 14 causes the first and second information signals A and B to be output. .. Can be recorded alternately and continuously in the order of address areas A1, B1, A2, B2, A3, B3,.

  It should be noted that the flow for stopping all recording by the optical pickup 14 may be inquired after step 57 or after 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 has the recording capacity Ya between the EMPTY value and the FULL value in the second and subsequent cycles. The first information signal A and the second information signal B having the recording capacity Yb are stored.

  In the information signal recording apparatus described above, although the input / output relationship is reversed, the information signal recording apparatus satisfies the above-described equations (1) to (18), and a detailed description thereof will be omitted.

<Information signal recording / reproducing device>
FIG. 10 is a diagram schematically showing an information signal recording apparatus to which an embodiment in which first and second information signals are recorded on an optical disk, and FIG. 11 shows a state in which the first and second information signals are recorded on an optical disk. FIG. 12 is a timing chart showing a state in which the first and second information signals are recorded on the optical disc.

As shown in FIG. 10, the information signal recording / reproducing apparatus is a combination of the above-described information signal recording apparatus and the information signal reproducing apparatus, and has a first and a second transfer rates Ra, Rb. , And one of the second information signals A and B is reproduced from the one area 13a (13b) on the optical disk 13 by the optical pickup 14 in a time-division manner. Are stored in one area 19a, 19b of the track buffer memory 19 at a constant transfer rate Rp faster than the transfer rates Ra, Rb of the other area, and the other information signal B (A) is stored in the other area of the track buffer memory 19. The data is read out from the optical discs 19b and 19a at a constant transfer rate Rp by the optical pickup 14 and recorded in the other area 13b (13a) on the optical disc 13 in a time-division manner.

  Here, the operation of the information signal recording / reproducing apparatus will be described with reference to FIGS. In FIG. 12, 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.

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

  Next, in step S72, it is confirmed whether or not the optical pickup 14 has reached the first address area A1 (target position) in the first area 13a, which is a place where reproduction is desired on the optical disc 13. Here, if the address area A1 (target position) has not been reached, step S72 is further continued. If the address area A1 (target position) has been reached, the process proceeds to the next step S73.

  Next, in step S73, the optical pickup 14 starts reproduction from the first address area A1 in the first area 13a, and transmits the first information signal A at the transfer rate Rp to the first information signal A in the track buffer memory 19. 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 performs 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, 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 not, the process proceeds to step S73. On the other hand, if the value reaches the EMPTY value, 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. 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 is transferred from the first area 19a to the AV- The first information signal A is temporarily stored in the first area 19a while increasing with the slope of the difference (Rp-Ra) of the transfer rate Ra read to the ENDEC 20 side.

  Next, in step S76, 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. On the other hand, when the FULL value is reached, the process proceeds to the next step S77.

  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 moves to the first area 13a on the optical disk 13. The reproduction in the first 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 transferred to the AV-ENDEC 20 at the transfer rate Ra. The read operation is continued, but this read operation only needs to be completed before the period up to the EMPTY value before the reproduction of the second address area A2 in the first area 13a is started, as is apparent from FIG.

  Next, in step S78, the optical pickup 14 moves to the first address area B1 in the second area 13b on the optical disc 13 to record the second information signal B next. (When moving to a different signal layer, the focus jump is performed as described above to move between signal planes.) At this time, the optical pickup 14 moves from the first address area A1 to the first address area A1 in the first area 13a on the optical disk 13. In the seek time Tab for moving to the first address area B1 in the second area 13b (FIG. 12 (similarly in FIGS. 6 and 9), only seek times Tab and Tba are described, but the seek time moves to a different signal layer). In this case, the time relationship including Fab and Fba of the focus jump is shown as described above) is within 0.5 seconds at the maximum (when moving to a different signal layer, within 0.7 seconds at the maximum).

  Next, in step S79, 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 disc 13. Here, if the address area B1 (target position) has not been reached, step S79 is further continued. If the address area B1 (target position) has been reached, the process proceeds to the next step S80.

  Next, in step S80, the second information signal B sent from the AV-ENDEC 20 at the transfer rate Rb is temporarily stored in the second area 19b of the track buffer memory 19 at the transfer rate Rb until it reaches the FULL value. It is memorized.

  Next, in step S81, 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. Returning, on the other hand, when reaching the FULL value, the process proceeds to the next step S82.

  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, and as shown in FIG. And the EMPTY value, the second information signal B is reduced by the gradient of the difference (Rp-Rb), and the second information signal B is transferred by the optical pickup 14 to the second information signal B on the optical disk 13 at a constant transfer rate Rp. It is recorded in the area 13b.

  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 EMPTY value. On the other hand, when the value reaches the EMPTY value, 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 moves to the second area 13b on the optical disk 13. Stop recording in the address area B1. 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. 12, the 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 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 0.5 at the maximum. Within seconds.

  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 S72 and the same is repeated thereafter, and the optical pickup 14 causes the first and second information signals A, B .. Can be recorded and reproduced continuously in a time-division manner 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 free area in the second area 13b on the optical disc 13 is recorded in the management area 13c after the recording is completed.

  Note that 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 is complicated, so that it is omitted here.

  In the flow of the time-division recording / reproduction of the two information signals, the second area 19b of the track buffer memory 19 changes from the empty state to the FULL value in the first cycle, but the second and subsequent cycles. Then, the second information signal B having the recording capacity Yb between the EMPTY value and the FULL value is stored.

  The above-described information signal recording / reproducing apparatus 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, when a new second information signal B is to be recorded while the first information signal A is being reproduced from the optical disc 13 first, the information should be recorded. The second information signal B is input, and the transfer rate Rb of the second information signal B is input and set. At this time, the system controller 22 records the set value of the transfer rate Rb of the input second information signal B, the transfer rate Ra of the currently reproduced first information signal A, and the management area of the optical disc 13. The empty area and the seek time previously recorded in the ROM as an apparatus are obtained by using the above-described equations (9), (10), (11) or (9a), (10a), (11a). ) To determine the capacity of the minimum recording area for recording.

  For example, if the optical disc 13 has only a large unrecorded area, the capacity of the minimum recorded area does not matter, but if small unrecorded areas are scattered due to repeated editing, the minimum Recording can be performed only in a vacant area larger than the capacity of the area, and recording cannot be performed in a vacant area smaller than the capacity.

  As described above, in a case where an area cannot be secured effectively, the transfer rate specified as the transfer rate Rb of the second information signal B to be recorded is reduced, and this is notified to the user. It is also possible to record as described above.

<Second example>
FIG. 14 is a block diagram for explaining the overall configuration of the information signal communication apparatus of the second example related to the present invention. For the sake of convenience, the same components as those described above will be denoted by the same reference numerals and will be described as appropriate, and new components will be denoted by new reference numerals. The following description focuses on differences from the first example.

  The information signal recording and / or reproducing apparatus 10A of the first example described above is an optical disk player that compresses and expands a video signal and an audio signal, whereas the information signal recording and / or reproducing apparatus 10A according to the present invention shown in FIG. The information signal communication device 25A of the two examples has an optical disk drive configuration that does not have a compression / decompression block, and an ATAPI interface 26 that provides an external communication connection to an output side of a track buffer memory 19 provided in the optical disk drive. Although not provided, a detailed description is omitted on the outside, and as a host computer, a program ROM describing a program for realizing the operation of the present example, a RAM for operating the program, a CPU, and peripheral hardware are provided. A host 27 having a bus or the like for connecting signals between the elements, and an AV-ENDEC (audio / video / Encoder-decoder) but 20 and that the block of compression and expansion are connected are different, other portions are the same as the first example. The optical disk drive described above is the same as the information signal recording and / or reproducing apparatus 10A of the first example except that the AV-ENDEC 20, buffer memory 21, and key 23 are omitted.

  The program ROM, which is described in detail in this embodiment and describes a program for causing a computer to execute a recording and / or reproduction processing operation, is recorded only as a mask ROM or the like in the program ROM in the apparatus. Instead, the present embodiment also includes an example in which the program is recorded on a CD-ROM disc or a DVD-ROM disc, and is executed by being read from the external device into the RAM. These programs may be read from a disk (recording medium) and taken into the computer, or may be transmitted via a communication network and taken into the computer.

  More specifically, an I / F block is provided in the ATAPI interface 26, and an I / F block is provided in the I / F portion of the AV-ENDEC20. The optical disk drive is controlled based on the command system of Mount Fuji (Mt. Fuji) of an industry organization that defines the optical disk drive.

  That is, in the first example described above, the first and second information signals A and B input at the time of recording by the optical disk player 10 are analyzed to determine the respective transfer rates Ra and Rb. Although the transfer rates Ra and Rb of the first and second information signals A and B were determined by calculation from the recording state of the optical disk 13 during reproduction of the optical disk 10, in the second example of the present invention, a key input to the optical disk drive was performed. Since there is no unit for decoding the control data from the optical disk 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 determined by the host from the I / F in the ATAPI interface 26. Input via 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 content to the I / F section of the AV-ENDEC 20, and a recording command and a recording start address are described below. In addition to the above information, the transfer rate flag of the signal is transferred to the optical disk 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.

  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 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 transfers the video signal having a transfer rate of 2 Mbps to the I / F section in the AV-ENDEC 20, and adds the transfer rate flag of the signal to the reproduction command as described below. To transfer. This is decoded in the signal processing section, and the reproduction processing is performed as described above according to the transfer rate.

  Although an example of performing communication has been described using the ATAPI interface 26 for performing communication connection with the outside, a standard such as IEEE 1394 may be used, and communication using radio waves or light other than communication using such a cable is also possible. May be. Further, although the signal to be recorded and reproduced is mainly described with respect to video data, it goes without saying that audio and music data, still images, sub-pictures, and decoded signals obtained by decoding these may be used. 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 on average in a certain range of transfer rate. In this example, the optical disk 13 is mainly described. However, the present invention can also be applied to a device such as a magnetic disk device that has a plurality of disks and a plurality of heads and performs recording and reproduction while alternately switching between them. Further, the disk is assumed to be a spiral continuous track, but it is also applicable to a case where the disk is composed of 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 / reproduction, and this operation can be similarly applied 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.

  In addition, the signal transfer rate is described mainly with respect to continuous signals such as video and audio, but computer data that does not make sense unless processed within a predetermined time is referred to as continuous data. Data, and generally 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.

FIG. 1 is a block diagram for explaining an overall configuration of an information signal recording and / or reproducing apparatus of a first example related to the present invention. In the information signal recording and / or reproducing apparatus according to the first example related to the present invention, the first and second areas on the optical disk and the first and second areas on the track buffer memory are provided with the first and second areas. FIG. 3 is a diagram schematically showing a state in which recording and / or reproduction of first and second information signals is performed by one optical pickup in a time-division manner. FIG. 2 is a diagram schematically illustrating an information signal reproducing apparatus to which a mode of reproducing first and second information signals from an optical disc is applied. FIG. 3 is a diagram showing addresses of first and second areas on an optical disc. 5 is a flowchart showing a state in which first and second information signals are reproduced from an optical disc. 5 is a timing chart showing a state in which first and second information signals are reproduced from an optical disc. FIG. 2 is a diagram schematically illustrating an information signal recording device to which a mode of recording first and second information signals on an optical disc is applied. 5 is a flowchart illustrating a state in which first and second information signals are recorded on an optical disc. 5 is a timing chart showing a state in which first and second information signals are recorded on an optical disc. FIG. 2 is a diagram schematically showing an information signal recording device to which a mode for recording and reproducing first and second information signals on an optical disc is applied. 5 is a flowchart showing a state in which first and second information signals are recorded / reproduced on / from an optical disc. 5 is a timing chart showing a state in which first and second information signals are recorded / reproduced on / from an optical disc. FIG. 4 is a diagram schematically showing an address arrangement of an optical disc having two signal layers related to the present invention. It is a block diagram for explaining the whole composition of the information signal communication device of the 2nd example relevant to the present invention. FIG. 4 schematically shows a state in which recording and / or reproducing and moving in a time-division manner by one optical pickup in the first and second areas on the optical disc having two signal layers of the first example related to the present invention. FIG.

Explanation of reference numerals

10A, 10B ... information signal recording and / or reproducing apparatus,
13 ... information signal recording medium (optical disc),
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),
25A, 25B ... information signal communication device,
26 ... ATAPI interface.

Claims (9)

The first and second information signals reproduced in a time-division manner from the first and second positions on the information signal recording medium having at least the first and second signal layers readable from one direction are temporarily stored. Storing 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 from the first and second positions on the information signal recording medium in a time-division manner at a constant transfer rate higher than the first and second transfer rates by one head. Transferring to the buffer memory in a time-sharing manner from
Transfer rates of the first and second information signals transferred from the head to the buffer memory... Rp,
A transfer rate for outputting the first information signal from the buffer memory... Ra;
A transfer rate for outputting the second information signal from the buffer memory... Rb;
An information unit quantity... Ya for transferring the first information signal from the head to the buffer memory;
An information unit amount... Yb for transferring the second information signal from the head 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,
Time required for the head to move from the second position to the first position on the information signal recording medium ... Tba
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Reproducing the first and second information signals from the information signal recording medium while satisfying the relational expression (1). Temporarily storing the first and second information signals respectively input at the first and second transfer rates in a buffer memory;
The first and second information signals read in a time-division manner from the buffer memory can be read from one head in one direction at a constant transfer rate higher than the first and second transfer rates. Time-division recording at first and second positions on an information signal recording medium having a second signal layer;
The transfer rates of the first and second information signals to be transferred from the buffer memory to the head, Rp,
A transfer rate for inputting the first information signal into the buffer memory... Ra;
A transfer rate for inputting the second information signal to the buffer memory... Rb;
An information unit amount for transferring the first information signal to the head from the buffer memory... Ya,
An information unit quantity... Yb for transferring the second information signal from the buffer memory to the head;
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,
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Recording the first and second information signals on the information signal recording medium while satisfying the relational expression (1). One of the first and second information signals is recorded, and the other is reproduced from the first signal recording medium having at least the first and second signal layers readable from one direction for recording and reproduction. 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. Storing in the
Transferring one information signal reproduced from a first position on the information signal recording medium to the buffer memory at a constant transfer rate faster than the first and second transfer rates; Recording the other information signal at a second position on the information signal recording medium at the transfer rate in a time-division manner;
Transfer rates of the first and second information signals input / output to / from the buffer memory by the head ... Rp,
A transfer rate for inputting the first information signal into the buffer memory... Ra;
A transfer rate for outputting the second information signal from the buffer memory... Rb;
An information unit amount for transferring the first information signal to the head from the buffer memory... Ya,
An information unit amount... Yb for transferring the second information signal from the head 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,
Time required for the head to move from the second position to the first position on the information signal recording medium: Tba,
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Recording and reproducing the first and second information signals on the information signal recording medium by satisfying the relational expression (1). The first and second information signals reproduced in a time-division manner from the first and second positions on the information signal recording medium having at least the first and second signal layers readable from one direction are temporarily stored. Storing 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 from the first and second positions on the information signal recording medium in a time-division manner at a constant transfer rate higher than the first and second transfer rates by one head. Transferring to the buffer memory in a time-sharing manner from
Transfer rates of the first and second information signals transferred from the head to the buffer memory... Rp,
A transfer rate for outputting the first information signal from the buffer memory... Ra;
A transfer rate for outputting the second information signal from the buffer memory... Rb;
An information unit quantity... Ya for transferring the first information signal from the head to the buffer memory;
An information unit amount... Yb for transferring the second information signal from the head 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,
Time required for the head to move from the second position to the first position on the information signal recording medium ... Tba
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Reproducing the first and second information signals from the information signal recording medium while satisfying the relational expression (1). Temporarily storing the first and second information signals respectively input at the first and second transfer rates in a buffer memory;
The first and second information signals read in a time-division manner from the buffer memory can be read from one head in one direction at a constant transfer rate higher than the first and second transfer rates. Time-division recording at first and second positions on an information signal recording medium having a second signal layer;
The transfer rates of the first and second information signals to be transferred from the buffer memory to the head, Rp,
A transfer rate for inputting the first information signal into the buffer memory... Ra;
A transfer rate for inputting the second information signal to the buffer memory... Rb;
An information unit amount for transferring the first information signal to the head from the buffer memory... Ya,
An information unit quantity... Yb for transferring the second information signal from the buffer memory to the head;
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,
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Recording a first information signal and a second information signal on the information signal recording medium by satisfying the relational expression (1). One of the first and second information signals is recorded, and the other is reproduced from the first signal recording medium having at least the first and second signal layers readable from one direction for recording and reproduction. 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. Storing in the
Transferring one information signal reproduced from a first position on the information signal recording medium to the buffer memory at a constant transfer rate faster than the first and second transfer rates; Recording the other information signal at a second position on the information signal recording medium at the transfer rate in a time-division manner;
Transfer rates of the first and second information signals input / output to / from the buffer memory by the head ... Rp,
A transfer rate for inputting the first information signal into the buffer memory... Ra;
A transfer rate for outputting the second information signal from the buffer memory... Rb;
An information unit amount for transferring the first information signal to the head from the buffer memory... Ya,
An information unit amount... Yb for transferring the second information signal from the head 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,
Time required for the head to move from the second position to the first position on the information signal recording medium: Tba,
Time required for the head to move from the first signal layer to the second signal layer on the information signal recording medium: Fab,
Time required for the head to move from the second signal layer to the first signal layer on the information signal recording medium: Fba;
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba + Fab + Fba) / (Rp−Ra−Rb)
Recording and reproducing the first and second information signals on the information signal recording medium by satisfying the relational expression (2). Recording the first and second information signals at the first and second positions, respectively, and rotating an information signal recording medium having at least the first and second signal layers readable from one direction;
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 temporarily stored in a buffer memory, and the first and second information signals are stored. At the 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 at a third transfer rate faster than the first and second transfer rates. Transferring time-divisionally from one head to the buffer memory;
The information signal amount for transferring the first information signal from the head to the buffer memory or the information unit amount for transferring the second information signal from the head to the buffer memory; A time required for the head to move from the first position to the second position, a time required for the head to move from the second position on the information signal recording medium to the first position, Is the time required for the head to move from the first signal layer on the information signal recording medium to the second signal layer, and the first signal is transmitted from the second signal layer on the information signal recording medium to the first signal layer. An information signal reproducing method, comprising: a step of determining based on a time required for moving to a layer and a relationship among the first, second, and third transfer rates. Rotating an information signal recording medium having at least first and second signal layers readable from one direction for recording the first and second information signals, respectively;
Temporarily storing the first and second information signals respectively input at the first and second transfer rates in a buffer memory;
The first and second information signals read out in a time-division manner from the buffer memory are transferred from one head to the first and second information signals on the information signal recording medium at a third transfer rate faster than the first and second transfer rates. , Time-divisionally recording at a second location;
The information unit amount for transferring the first information signal to the head from the buffer memory or the information unit amount for transferring the second information signal to the head from the buffer memory, wherein the information signal recording medium A time required for the head to move from the first position to the second position, a time required for the head to move from the second position on the information signal recording medium to the first position, Is the time required for the head to move from the first signal layer on the information signal recording medium to the second signal layer, and the first signal is transmitted from the second signal layer on the information signal recording medium to the first signal layer. An information signal recording method, comprising the step of determining based on a relationship between a time required for moving to a layer and the first, second, and third transfer rates. Rotating an information signal recording medium having at least first and second signal layers readable from one direction for recording / reproduction for recording one of the first and second information signals and reproducing the other; When,
One information signal reproduced from a first position on the information signal recording medium is temporarily stored in a buffer memory and output at a first transfer rate, and the other information input at a second transfer rate. Temporarily storing a signal in said buffer memory;
Transferring one information signal reproduced from the first position on the information signal recording medium to the buffer memory at a third transfer rate faster than the first and second transfer rates;
Recording the other information signal input to the buffer memory at a second position on the information signal recording medium at the transfer rate in a time-division manner;
An information unit amount for transferring the first information signal from the buffer memory to the head; an information unit amount for transferring the second information signal from the head to the buffer memory; A time required for the head to move from the first position to the second position, a time required for the head to move from the second position on the information signal recording medium to the first position, Is the time required for the head to move from the first signal layer on the information signal recording medium to the second signal layer, and the first signal is transmitted from the second signal layer on the information signal recording medium to the first signal layer. An information signal recording / reproducing method, comprising a step of determining based on a time required for moving to a layer and a relationship between the first, second, and third transfer rates.

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