JP3513998B2 - Multi-layer disk recording / reproducing method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer disc recording / reproducing method and apparatus for simultaneously recording / reproducing from a plurality of signal faces of a multi-layer disc having two or more signal faces.

[0002]

2. Description of the Related Art Conventionally, a multi-layer disc having two or more signal surfaces has been known. In such a multi-layer disc player, a signal is read from any one of the signal surfaces and reproduced.

[0003]

However, the conventional multi-layer disc player cannot reproduce signals from a plurality of signal surfaces of the multi-layer disc at the same time. Further, a recording device capable of simultaneously recording on a plurality of signal surfaces of a multi-layer disc has not been known. Therefore, it is an object of the present invention to provide a multi-layer disc reproducing method and device capable of simultaneously reproducing from a plurality of signal surfaces of a multi-layer disc. Another object of the present invention is to provide a multilayer disc recording method and apparatus capable of simultaneously recording on a plurality of signal surfaces of a multilayer disc. Another object of the present invention is to provide a multilayer disc recording / reproducing method and apparatus capable of simultaneously recording / reproducing on / from a plurality of signal surfaces of a multilayer disc.

[0004]

In order to achieve the above object, a multi-layer disc reproducing apparatus of the present invention provides a signal recorded on the signal surface from one side of a multi-layer disc having a plurality of signal surfaces. A single reading means capable of reading, a plurality of storage means for accumulating the signals read from each of the plurality of layers by the reading means, a decoder for decoding the signals accumulated in the plurality of storage means, and Read means and control means for controlling the plurality of storage means, the read means reads signals from the multilayer disc faster than the decoder decodes, and the control means sequentially reads the signals in a time division manner. so that the focus Jean switching a layer means reads the signal
Is up, the signal which the reading means has read from each layer of the multilayer disk to control so as to accumulate in the storage means corresponding to the respective layers, the decoder without the signal accumulated in said plurality of storage means is interrupted It is controlled so that it is supplied.

Further, the multilayer disc recording apparatus of the present invention is
A single recording means capable of recording a signal on the signal surface from one side of a multi-layer disc having a plurality of signal surfaces, and a plurality of storages for accumulating signals for recording on each of the plurality of layers by the recording means. Means, an encoder for encoding the signals accumulated in the plurality of storage means, and a control means for controlling the recording means and the plurality of storage means, wherein the recording means is faster than the encoder encodes. the recorded signals to the multi-layer disc, the control means, in a time division manner sequentially and said recording means is so that the focus jump switching a layer for recording a signal, a signal that the recording means records in each layer of the multilayer disk Control is performed so that the data is read from the storage means corresponding to each layer, and the signals accumulated in the plurality of storage means are uninterrupted. It is obtained so as to control to supply from over da.

Further, the multilayer disc recording / reproducing apparatus of the present invention records a signal to the signal surface or reads a signal recorded on the signal surface from one side of a multilayer disc having a signal surface of a plurality of layers. A single recording / reproducing means capable of outputting, a plurality of storage means for accumulating a signal to be recorded in each layer of the plurality of layers by the recording / reproducing means or a signal read from each layer of the plurality of layers, and the plurality of storages A recording means for decoding the signals stored in the storage means, an encoder for encoding the signals stored in the storage means, a control means for controlling the recording / playback means and the storage means, Means for recording or reading a signal onto the multilayer disc faster than the decoder and the encoder decode or encode; Control means, time division and sequentially said recording and reproducing means you switch the recording or reading layer a signal
A focus jump is made to occur, and a signal to be recorded in each layer of the multi-layer disc by the recording / reproducing means is read from the plurality of storage means corresponding to each layer, or a signal read from each layer is read out from the plurality of layers corresponding to each layer. Control so that the storage means stores the signals, and control so that the signals read from the plurality of storage means without interruption are supplied from the encoder, or the accumulated signals are supplied to the decoder. It is the one.

The multi-layer disc reproducing method of the present invention is
From one side of a multi-layer disc having a signal surface of a plurality of layers, the signal recorded on the signal surface is read by a single reading means, and the signals read from each layer of the plurality of layers are accumulated in a plurality of storage means, A decoder decodes signals stored in the plurality of storage means, controls the reading means and the plurality of storage means by a control means, and reads signals from the multilayer disc faster than the decoder decodes; so that the focus jump is to switch the layer to read the divided and sequentially signal
The signals read from each layer of the multi-layer disc are stored in the storage means corresponding to each layer so that the signals stored in the plurality of storage means are supplied to the decoder without interruption. Is.

According to the multi-layer disc recording method of the present invention, a signal is recorded from one side of a multi-layer disc having a plurality of layers of signal surfaces to the signal surface by a single recording means, and is recorded in each layer of the plurality of layers. Of the signals stored in the plurality of storage means, the signals stored in the plurality of storage means are encoded by an encoder, the recording means and the plurality of storage means are controlled by the control means, and the encoder encodes the signals. storage even faster signal was recorded on the multilayer disk, in a time division manner by <br/> example so that the focus jump switch the layer for recording a sequential signal, a corresponding signal to be recorded on each layer of the multi-layer disc to the layers The signal to be stored in the plurality of storage means is supplied from the encoder without interruption. It is.

Further, multi-layer disc reproducing method of the present invention, from one side of the multi-layer disc having a signal surface of the plurality of layers, a signal recorded signals on the recording or the signal surface to the signal surface single A signal to be read by one recording / reproducing means and recorded in each layer of the plurality of layers or a signal read from each layer of the plurality of layers is accumulated in a plurality of storage means, and a signal accumulated in the plurality of storage means Is decoded by a decoder, a signal accumulated in the plurality of storage means is encoded by an encoder, the recording / reproducing means and the plurality of storage means are controlled by the control means, and the decoder and the encoder decode or encode. Record or read signals on the multi-layer disc faster and record or read signals sequentially in a time-sharing manner So that switching the layer to issue focus
The signal to be recorded in each layer of the multilayer disc is read out from the storage means corresponding to each layer, or the signal read from each layer is accumulated in the storage means corresponding to each layer, without interruption. The signals read from the plurality of storage units are controlled so as to be supplied from the encoder or the accumulated signals are supplied to the decoder.

Recording / recording on such a multilayer disc of the present invention
According to the reproducing method and apparatus, it is possible to simultaneously reproduce from a plurality of signal surfaces of the multilayer disc, simultaneously record to a plurality of signal surfaces, and record and reproduce to a plurality of signal surfaces simultaneously. Therefore, it is possible to output and display a plurality of different reproduced images and the like from one player. Further, a plurality of different image signals and the like can be simultaneously recorded on the multilayer disc by one recorder. Furthermore, 1
It becomes possible to record while reproducing on a multi-layer disc by one recorder player.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of a reproducing apparatus for a multilayer disc of the present invention, which embodies the reproducing method for a multilayer disc of the present invention, is shown in FIG. 1 (a), and FIG. A schematic configuration is shown. Further, FIG. 2 shows an operation timing chart of the reproducing apparatus for the multilayer disc shown in FIG. FIG. 1B shows a schematic structure of a multi-layer disc having two signal surfaces. The multi-layer disc 1 has a first signal surface 1-2 and a second signal surface 1.
-3 and 3 are laminated, and a protective layer 1-1 and a protective layer 1-4 are provided before and after that. This first
The signal surface 1-2 is formed of a semitransparent film, and the second signal surface 1-3 is formed of a reflective film. In this figure, the laser light focused by the objective lens 2 is focused on the first signal surface 1-2, and the signal can be read from the first signal surface 1-2.

As shown in FIG. 1, the reproducing apparatus for a multi-layer disc irradiates a laser beam or the like from an optical pickup 3 through an objective lens 2 onto a multi-layer disc 1 having such a two-layered signal surface so as to focus it. The signal is read from one of the signal planes. R read from the optical pickup 3
The F signal is reproduced into the original digital signal by the analog / digital converter (A / D) 4 and the selection switch (S
W1) 5 is input to the movable contact. Select switch (SW
1) 5 selects and supplies the reproduction signal read from the optical pickup 3 to the first memory 8 or the second memory 10.

The central processing unit (CPU) 6 has status information F1 from the first memory 8 and the second memory 10.
Upon receiving F2, a switch changeover signal S for controlling the selection switch 5 is output, and a jump command signal J1,
J2, a focus command signal, and a tracking servo command signal are output to the servo means 7. The servo means 7 receives the focus command signal and the tracking servo command signal from the CPU 6, and performs the focus servo control and the tracking servo control of the optical pickup 3. Further, in response to the jump command signals J1 and J2, a focus jump from the first signal surface 1-2 to the second signal surface 1-3, or from the second signal surface 1-3 to the first signal surface 1-2. Do a focus jump.

The first memory 8 has a selection switch (SW
1) The signal read from the first signal surface 1-2 sorted by 5 is written, and the second signal surface 1-3 sorted by the selection switch (SW1) 5 is written in the second memory 10.
The signal read from is written. Then, the first memory 8 and the second memory 10 respectively output the state signal F1 or the state signal F2 indicating the state to the CPU 6 when the data storage amount becomes full. In addition, the decoder 9 and the decoder 11 read signals from the first memory 8 and the second memory 10 respectively over the entire period, and the signals recorded on the first signal surface 1-2 are reproduced from the decoder 9 and the video is reproduced. A signal (VIDEO 1) and an audio signal (AUDIO 1) are output, and the signal recorded on the second signal surface 1-3 is reproduced from the decoder 11 and is reproduced as a video signal (VIDEO 2) and an audio signal (AUDIO 2). Is output.

The operation of the multi-layer disc reproducing apparatus of the present invention thus constructed will be described with reference to the operation timing chart shown in FIG. 2A shows a change in the amount of data stored in the first memory 8, FIG. 2B shows a change in the amount of data stored in the second memory 10, and FIG. Status signal F1 output from the memory 8, second
The status signal F2 output by the memory 10 and the CPU 6
The timings of the jump command signals J1 and J2 and the switch switching signal S output by

It is assumed that the optical pickup 3 is reading a signal from the first signal surface 1-2 of the multilayer disc 1 at the timing when the time t is t0. In this case, the CPU 6 switches the selection switch (SW1) 5 to the H side, that is, the first memory 8 side. Then, the signal read from the optical pickup 3 is supplied to the first memory 8 by the selection switch (SW1) 5, and the writing to the first memory 8 is started at the timing of time t0. At this time, the speed at which the optical pickup 3 reads the signal from the multilayer disc 1 is set to 10 Mbps, and the decoder 9 and the decoder 11 are used.
If the average speed of reading signals from the memories 8 and 10 and decoding is 3 Mbps, the first memory 8 has 1
Since data from the multi-layer disc 1 is written at 0 Mbps and data is read at 3 Mbps at the same time,
Data is accumulated at a speed of about 7 Mbps.

When the amount of data in the first memory 8 becomes full at time t1, the first memory 8 outputs to the CPU 6 a status signal F1 indicating that it is full. CPU6
In response to this, the jump command J2 is output to the servo means 7, and the servo means 7 controls the optical pickup 3 to focus jump from the first signal surface 1-2 to the second signal surface 1-3 of the multilayer disc 1. Let At the same time, the CPU 6 inverts the switch switching signal S. As a result, the optical pickup 3 comes to read a signal from the second signal surface 1-3, and the read signal is input to the second memory 10 via the selection switch (SW1) 5 switched to the L side. Written. In this case, in order to search for the last signal sent to the second memory 10 by the previous access and write the signal continuously, the second signal plane 1- The signal read from 3 is written in the second memory 10.

In this search, since a signal is recorded on the multi-layer disc 1 with a sector as a minimum unit, a desired signal is searched by using the sector address. At this time, the signal read from the multi-layer disc 1 at 10 Mbps is written in the second memory 10, and the decoder 11 reads the signal from the second memory 10 at an average of 3 Mbps. As shown in b), data is accumulated at a speed of about 7 Mbps. Then, when the data storage amount of the second memory 10 becomes full at time t3, the second memory 10 sends a state signal F2 indicating this full state to the CPU 6.

In response to this, the CPU 6 receives the jump command J
1 is output to the servo means 7, and the servo means 7 controls the optical pickup 3 to cause a focus jump from the second signal surface 1-3 of the multilayer disc 1 to the first signal surface 1-2. At the same time, the CPU 6 inverts the switch switching signal S.
As a result, the optical pickup 3 returns to the first signal surface 1-2 again.
Signal is read from the
It is input to and written in the first memory 8 via the selection switch (SW1) 5 which is switched to the side. in this case,
After the search time from time t3 to time t4, the last signal sent to the first memory 8 by the previous access is searched and the signal is written continuously after that.
The signal read from the first signal surface 1-2 is written in the first memory 8.

Such an operation is repeated, and signals are alternately read from the first signal surface 1-2 and the first signal surface 1-3 of the multilayer disc 1 as shown in FIG. The signals from 1-2 are stored in the first memory 8 and the second signal surface 1
When the signal from -3 is written in the second memory 10, the data storage amount changes as shown in the figure. At this time, the decoder 9 reads and reproduces the signal recorded on the first signal surface 1-2 from the first memory 8 for the entire period, and at the same time, the decoder 11 outputs the second signal from the second memory 10 for the entire period. The signal recorded on the surface 1-3 is read and reproduced. That is, it is possible to simultaneously reproduce two different images and sounds recorded on the respective signal surfaces of the multilayer disc 1 and display / reproduce them on a television receiver or the like.

In this case, the condition for simultaneous reproduction is that the amount of signal that the optical pickup 3 can read out in a unit time is larger than the total amount of signals reproduced in the unit time by the decoder 9 and the decoder 11. It becomes a condition.

Next, the operation of the above-described reproducing apparatus for a multilayer disc according to the present invention will be described again with reference to the flow chart shown in FIG. When reproduction is instructed in the reproducing apparatus of the multilayer disc, this flow chart is started, and after jumping to the first layer which is the first signal surface 1-2 in step S10, the track search to the last portion of the previous reproduction is performed. . In this case, immediately after the reproduction instruction, since there is no previous access, the first part of the signal is searched. Next, in step S12, the selection switch (SW1) 5 is switched to the H side, that is, the first memory 8 side, and the data reproduced from one layer is written in the first memory 8 in step S14.

Next, in step S16, it is determined whether or not the amount of data stored in the first memory 8 is full.
In this case, if the data storage amount is not full, it is determined to be "NO", and the process returns to step S14 and further 1
The data reproduced from the layers is written in the first memory 8. As a result, when it is determined in step S16 that the data storage amount of the first memory 8 is full, "YE
S "is determined and the process proceeds to step S18. The determination in step S16 is performed every time the sector, which is the minimum recording unit, is read.

In step S18, after the focus jump to the second layer which is the second signal surface 1-3, the track search to the last data portion of the previous reproduction is performed. Then
In step S20, the selection switch (SW1) 5 is on the L side,
That is, the data which is switched to the second memory 10 side and is reproduced from the two layers in step S22 is the second memory 1 side.
Written to zero. Next, in step S22, it is determined whether or not the amount of data stored in the second memory 10 is full.

In this case, if the data storage amount is not full, it is determined to be "NO", the process returns to step S22, and the data reproduced from the two layers is stored in the second memory 10.
Will be written in. As a result, in step S24, the second
When it is determined that the amount of data accumulated in the memory 10 is full, it is determined to be "YES" and the process returns to step S10,
The processes of steps S10 to S24 are cyclically executed. The determination in step S24 is performed every time the sector, which is the minimum unit of recording, is read. In this way, the data is alternately written to the first memory 8 and the second memory 10, and the memory to be written is switched when the data storage amount becomes full. It should be noted that the "full data storage amount" state does not mean that the memory has no free space, but does not have a free space.

Next, FIG. 4 shows a modified example of the embodiment of the disc reproducing apparatus of the present invention. This disc reproducing apparatus is a multi-layer disc 1 on which the image and sound shown in FIG. 1 are recorded. Data is recorded in place of images and sounds. The decoder 9 and the decoder 11 simultaneously reproduce and output the data recorded on the first signal surface 1-2 and the second signal surface 1-3. There is. The structure and operation of this disc reproducing apparatus are the same as those of the disc reproducing apparatus shown in FIG. 1, and therefore detailed description thereof will be omitted, but the first signal surface 1-2 and the first signal surface 1-2 of the multi-layer disc 1 having two layers will be omitted. 2 signal side 1
The data read alternately from -3 is the first memory 8
And the second memory 10 are alternately written, and the decoder 9 or the decoder 11 reads and decodes the data from the first memory 8 and the second memory 10 over the entire period, and outputs the data as data 1 and data 2 at the same time. .

Next, FIG. 5 shows another modification of the embodiment of the disc reproducing apparatus of the present invention. In this disc reproducing apparatus, the multi-layer disc 1 in which the data shown in FIG. 4 is recorded has three layers. Therefore, the decoder 9 records the data recorded on the first signal surface, the decoder 11 records the data recorded on the second signal surface, and the decoder 13 records the independent data. In this case, the data recorded on the third signal surface are simultaneously reproduced and output.

Since the structure and operation of this disc reproducing apparatus are almost the same as those of the disc reproducing apparatus shown in FIG. 1, detailed description thereof will be omitted, but the first signal surface of the multilayer disc 1 having three layers, The data sequentially read from the second signal plane and the third signal plane are stored in the first memory 8 and the second memory plane.
The first memory 8, the second memory 10, and the third memory 12 are sequentially written in the memory 10 and the third memory 12.
The data constantly read from the memory 12 is decoded by the decoder 9, the decoder 11, or the decoder 13, and is simultaneously output as data 1, data 2 and data 3.

Next, FIG. 6 shows the configuration of an embodiment of the disc recording apparatus of the present invention which embodies the disc recording method of the present invention. The recording device for the multilayer disc shown in this figure is
Multilayer disc 2 having two layers of signal surfaces as shown in FIG.
1. The objective lens 2 receives laser light from the optical pickup 23
Illuminate through 2 and record the signal on either signal surface. An RF signal recorded from the optical pickup 23 is converted into a recordable analog signal by a digital / analog converter (D / A) 24, and the D / A converter 24 is input to a selection switch (SW1) 25. One of the signals read from the first memory 28 and the second memory 30 is input.

The selection switch (SW1) 25 is switched to the H side and read from the first memory 28 when the optical pickup 23 is recording a recording signal on the first signal surface of the multilayer disc 21. Is selected to record on the first signal surface, and the optical pickup 23
When the recording signal is recorded on the second signal surface of No. 1, the signal read from the second memory 30 by switching to the L side is selected to be recorded on the second signal surface. The central processing unit (CPU) 26 receives the status information E1 and E2 from the first memory 28 and the second memory 30, outputs a switch switching signal S for controlling the selection switch 25, and jump command signals J1 and J2. The focus command signal and the tracking servo command signal are output to the servo means 27.

The servo means 27 receives the focus command signal and the tracking servo command signal from the CPU 26,
Focus servo control and tracking servo control of the optical pickup 23 are performed. Further, in response to the jump command signals J1 and J2, a focus jump from the first signal surface of the multilayer disc 21 to the second signal surface or a focus jump from the second signal surface of the multilayer disc 21 to the first signal surface is performed. . In the first memory 28, the video (VI
The DEO 1) signal and the audio (AUDIO 1) signal are written over the entire period, and the video (VIDEO 2) signal and the audio (AUDIO 2) signal encoded by the second encoder 31 are stored in the second memory 30. Written over the entire period.

The data speed written from the optical pickup 23 to the multilayer disc 21, that is, the data speed read from the first memory 28 or the second memory 30 is generally 10 Mbps, and the encoder 29 is used.
Alternatively, the data rate written from the encoder 31 to the first memory 28 or the second memory 30 is 3M on average.
bps. Then, the first memory 28 and the second memory
When the amount of data accumulated in the memory 30 becomes empty,
The state signal E1 or the state signal E2 indicating the state is output to the CPU 26, respectively.

The operation of the multi-layer disc recording apparatus of the present invention thus constructed will be described with reference to the operation timing chart shown in FIG. 7A shows a change in the amount of data stored in the first memory 28, FIG. 7B shows a change in the amount of data stored in the second memory 30, and FIG. The status signal E1 output from the memory 28, the status signal E2 output from the second memory 30, and the CPU
26 shows the timings of the jump command signals J1 and J2 and the switch switching signal S output by 26.

In FIG. 7, it is assumed that the optical pickup 23 records a signal on the first signal surface of the multilayer disc 21 at the timing of time t0. In this case, the CPU
Reference numeral 26 switches the selection switch (SW1) 25 to the H side, that is, the first memory 28 side. The signal read from the first memory 28 selected by the selection switch (SW1) 25 is supplied to the optical pickup 23, so that the data is read from the first memory 28 at the timing when the time t is 0. Start to be served. At this time, if the speed at which the optical pickup 23 reads the signal from the multilayer disc 21 is 10 Mbps and the speed at which the decoder 29 and the decoder 31 encode the signal is 3 Mbps on average, the first memory 28 has the encoder 29 at 3 bps.
Since the data is written at 10 Mbps and the data is read at 10 Mbps, the accumulated data decreases at a speed of about 7 Mbps.

When the amount of data in the first memory 28 becomes empty at time t1, the first memory 28 outputs to the CPU 26 a status signal E1 indicating that it is empty. CPU
In response to this, 26 sends the jump command J2 to the servo means 2
7, the servo means 27 controls the optical pickup 23 to cause a focus jump from the first signal surface of the multilayer disc 21 to the second signal surface. At the same time, the CPU 26 inverts the switch switching signal S. As a result, the optical pickup 23 records a signal on the second signal surface of the multilayer disc 21. This recorded signal is read from the second memory 30 via the selection switch (SW1) 25 switched to the L side. In this case, the last signal read from the second memory 30 by the previous access is searched, and the signal following that signal is searched for in the second memory 3
In order to read from 0, time t1 to time t2
After the search time up to, the signal is read from the second memory 30.

In this search, since a signal is recorded on the multilayer disc 21 with a sector as a minimum unit, a desired signal is searched by using the sector address. At this time, the signal read from the second memory 30 at 10 Mbps is written to the multi-layer disk 21, and the data encoded by the encoder 31 at an average of 3 Mbps is written to the second memory 30.
, The accumulated data decreases at a speed of about 7 Mbps as shown in FIG. Then, when the amount of data accumulated in the second memory 30 becomes empty at time t3, the second memory 30 sends a status signal E2 indicating this empty status to the CPU 26.

In response to this, the CPU 26 outputs a jump command J1 to the servo means 27, and the servo means 27 controls the optical pickup 23 to cause a focus jump from the second signal surface of the multilayer disc 21 to the first signal surface. At the same time, the CPU 26 inverts the switch switching signal S.
As a result, the optical pickup 23 again records a signal on the first signal surface, and this recorded signal is read from the first memory 28 via the selection switch (SW1) 25 switched to the H side. In this case, the search from the time t3 to the time t4 is performed in order to search the last signal read from the first memory 28 by the previous access and read the signal following the signal from the first memory 28. After a lapse of time, the signal is read from the first memory 28.

Such an operation is repeated, signals are alternately recorded on the first signal surface and the first signal surface of the multilayer disc 21 as shown in FIG. 7, and the signal recorded on the first signal surface is the first signal surface. The signal recorded on the second signal surface from the first memory 28 is read from the second memory 30,
The data storage amount changes as shown in the figure. At this time, over the entire period, the signal recorded on the first signal surface is encoded from the encoder 29 and written in the first memory 28, and at the same time, the signal recorded on the second signal surface is encoded from the encoder 31 over the entire period. It is cross-encoded and written in the second memory 30. That is, the encoder 29
The two different image signals and audio signals simultaneously encoded by the encoder 31 and the encoder 31 can be alternately recorded on the respective signal surfaces of the multilayer disc 21.

In this case, the condition for simultaneous recording is that the amount of signal that the optical pickup 23 can record a signal within a unit time is larger than the total amount of signals encoded by the encoder 29 and the encoder 31 within a unit time. It becomes a condition.

Next, the operation of the above-described multi-layer disc recording apparatus of the present invention will be described again with reference to the flow chart shown in FIG. When the recording is instructed in the recording device of the multi-layer disc, this flow chart is started, and after jumping to one layer which is the first signal surface of the multi-layer disc 21 in step S30, the track search to the last portion of the previous recording is performed. Be seen. In this case, immediately after the recording instruction, since there is no previous access, the first part of the signal is searched. Next, in step S32, the selection switch (SW1) 25 is switched to the H side, that is, the first memory 28 side, and the signal read from the first memory 28 is recorded in one layer in step S34.

Next, in step S36, it is determined whether or not the amount of data stored in the first memory 28 is empty.
In this case, if the data storage amount is not empty, "N
If it is determined to be "O", the process returns to step S34, and the signal read from the first memory 28 is recorded in one layer. As a result, if it is determined in step S36 that the data storage amount in the first memory 28 is empty, it is determined to be "YES" and the process proceeds to step S38. Note that step S3
The determination of 6 is performed every time a sector, which is the minimum unit of recording, is recorded.

In step S38, after the focus jump to the second layer, which is the second signal surface of the multilayer disc 21, the track search to the last data portion of the previous recording is performed. Then, in step S40, the selection switch (SW
1) 25 is switched to the L side, that is, the second memory 30 side, and the signal read from the second memory 30 in step S42 is recorded in the two layers. Then, step S
At 44, it is determined whether or not the amount of data stored in the second memory 30 has become empty.

In this case, if the data storage amount is not empty, it is determined to be "NO", the process returns to step S42, and the signal read from the second memory 30 is recorded in two layers. As a result, when it is determined in step S44 that the amount of data stored in the second memory 30 is empty,
The determination is “YES”, the process returns to step S30, and the processes of steps S30 to S44 are cyclically executed. The determination in step S44 is performed every time a sector, which is the minimum unit of recording, is recorded. In this way, the data is alternately read from the first memory 28 and the second memory 30, and the data is alternately recorded on the first signal surface and the second signal surface of the multilayer disc. The memory to be read is switched when the data storage amount of 30 becomes empty. It should be noted that the state of “the data storage amount is empty” indicates that there is no data to be read, but some data to be read may remain.

Next, FIG. 9 shows the configuration of an embodiment of the disc recording / reproducing apparatus of the present invention which embodies the disc recording / reproducing method of the present invention. The multi-layer disc recording / reproducing apparatus shown in this figure irradiates a multi-layer disc 41 having a two-layer signal surface as shown in FIG. Record the signal on the face. Alternatively, the multilayer disc 41 is irradiated with laser light or the like from the optical pickup 43 via the objective lens 42, and a signal is read from any one of the signal surfaces. The RF signal recorded by the optical pickup 43 is input through the selection switch (SW1) 44, and the RF signal read from the second memory 51 is digital / digital.
The signal is converted into an analog signal that can be recorded by the analog converter (D / A) 52.

The RF signal read from the optical pickup 43 is input to the analog / digital converter (A / D) 47 via the selection switch (SW1) 44,
It is the original digital signal. The signal from the A / D converter 47 is written in the first memory 48. The selection switch (SW1) 44 is switched to the H side so that the read signal is written to the first memory 48 when the optical pickup 43 reads the recording signal from the first signal surface of the multilayer disc 41. And the optical pickup 43
When the recording signal is recorded on the second signal surface of the multi-layer disc 41, the signal read from the second memory 51 by switching to the L side is selected to be recorded on the second signal surface. . The central processing unit (CPU) 45 has state information F1 from the first memory 48 and the second memory 51.
In response to E2, the switch changeover signal S for controlling the selection switch 44 is output and the jump command signal J
1, J2, the focus command signal and the tracking servo command signal are output to the servo means 46.

The servo means 46 receives the focus command signal and the tracking servo command signal from the CPU 45,
Focus servo control and tracking servo control of the optical pickup 43 are performed. In addition, in response to the jump command signals J1 and J2, a focus jump from the first signal surface of the multilayer disc 41 to the second signal surface or a focus jump from the second signal surface of the multilayer disc 41 to the first signal surface is performed. . A signal is read from the first memory 48 over the entire period, and the read signal is decoded by a decoder 49 to continuously output a video (VIDEO 1) signal and an audio (AUDIO 1) signal. It is being output. Further, a video (VIDEO 2) signal and an audio (AUDIO 2) signal are encoded and written in the second memory 51 by the encoder 50 over the entire period.

The writing speed and the reading speed from the optical pickup 43 to the multi-layer disc 41, that is, the data speed written to the first memory 48 or the data speed read from the second memory 51 is generally 10 Mbps. Data rate read from memory 48 to decoder 49, or encoder 5
The average data rate of data written from 0 to the second memory 51 is 3 Mbps. Then, the first memory 48 outputs a status signal F1 indicating the status to the CPU 45 when the data storage amount becomes full, and the second memory 51
Outputs a status signal E2 indicating the status to the CPU 45 when the data storage amount becomes empty.

The operation of the multi-layer disc recording apparatus of the present invention thus constructed will be described with reference to the operation timing chart shown in FIG. The first memory 4 is shown in FIG.
8 shows the change in the amount of data stored, FIG. 8B shows the change in the amount of data stored in the second memory 51, and FIG. 8C shows the state signal F1 output from the first memory 48.
Status signal E2 and CP output from the second memory 51
The timings of the jump command signals J1 and J2 and the switch switching signal S output by U45 are shown.

In FIG. 10, it is assumed that the optical pickup 43 reads out a signal from the first signal surface of the multi-layer disc 41 at the timing of time t0. In this case, the CPU 45 switches the selection switch (SW1) 44 to the H side. As a result, the signal read from the optical pickup 43 to the first memory 48 is transferred to the selection switch (S
W1) 44 and the A / D converter 47, and the data is written in the first memory 48 at the timing of time t0. At this time, the data speed at which the optical pickup 43 reads the signal from the multilayer disc 41 is set to 10 Mb.
If the data rate at which the decoder 49 decodes the signal is 3 Mbps on average, the first memory 48 has 1
Data is written at 0 bps and at the same time, 3 Mbps
Since the data is read to the decoder 49 at, about 7 Mb
Data is accumulated at a rate of ps.

When the amount of data in the first memory 48 becomes full at time t1, the first memory 48 outputs to the CPU 45 a status signal F1 indicating that it is full. C
In response to this, the PU 45 outputs a jump command J2 to the servo means 46, and the servo means 46 outputs the optical pickup 43.
Is controlled to cause a focus jump from the first signal surface to the second signal surface of the multilayer disc 41. At the same time, the CPU 45
The switch switching signal S is inverted. As a result, the optical pickup 43 records a signal on the second signal surface of the multilayer disc 41. This recorded signal is read from the second memory 51 via the selection switch (SW1) 44 switched to the L side. In this case, the search from the time t1 to the time t2 is performed in order to search the last signal read from the second memory 51 by the previous access and read the signal following the signal from the second memory 51. After a lapse of time, the recording signal comes to be read from the second memory 51.

In this search, since a signal is recorded on the multilayer disc 41 with a sector as a minimum unit, a desired signal is searched by using the sector address. At this time, the signal read out from the second memory 51 at 10 Mbps is written in the multi-layer disc 41, and the encoder 50 writes the data encoded at 3 Mbps on average in the second memory 51 for the entire period. The accumulated data decreases at a speed of about 7 Mbps, as shown in FIG. When the amount of data accumulated in the second memory 51 becomes empty at time t3, the second memory 51 sends a status signal E2 indicating this empty status to the CPU 4
Send to 5.

In response to this, the CPU 45 outputs a jump command J1 to the servo means 46, and the servo means 46 controls the optical pickup 43 to cause a focus jump from the second signal surface of the multilayer disc 41 to the first signal surface. At the same time, the CPU 45 inverts the switch switching signal S.
As a result, the optical pickup 43 again reads the signal from the first signal surface, and the read signal is H level.
It is written in the first memory 48 via the selection switch (SW1) 44 switched to the side. In this case, the last signal written in the first memory 48 by the previous access is searched for, and the subsequent signal is searched for in the first memory 48.
In order to write to the first memory 48, the signal read after the search time from time t3 to time t4
Will be written to.

Such an operation is repeated, and FIG.
As shown in, the operation of reading a signal from the first signal surface of the multilayer disc 41 and the operation of recording a signal on the second signal surface are alternately performed. In this case, the signal read out from the first memory 48 over the entire period is decoded by the decoder 49 to continuously output the video signal and the audio signal, and the encoder 50 continuously encodes the video signal and the audio signal. Is the second memory 51 for the entire period
Written in. That is, reading and recording can be performed on the multilayer disc 41 at the same time.

The conditions for simultaneous recording and reproduction in this case are as follows.
The condition is that the amount of signals that the optical pickup 43 can record / reproduce in a unit time is larger than the total amount of signals decoded or encoded in the unit time by the decoder 49 and the encoder 50.

Next, the operation of the above-described multilayer disc recording / reproducing apparatus of the present invention will be described again with reference to the flow chart shown in FIG. When recording / reproducing is instructed in the recording / reproducing apparatus for the multi-layer disc, this flow chart is started, and the multi-layer disc 41 is started in step S50.
After jumping to the first layer, which is the first signal surface, the track search is performed to the last part of the previous reproduction. In this case, immediately after the recording / reproducing instruction, since there is no previous access, the first part of the signal is searched. Next, in step S52, the selection switch (SW1) 44 is switched to the H side, that is, the first memory 48 side, and the signal read from the first layer is written in the first memory 28 in step S54.

Next, in step S56, it is determined whether or not the amount of data stored in the first memory 48 is full. In this case, when the data storage amount is not full, it is determined to be "NO", the process returns to step S54, and the signal read from the first layer is written in the first memory 48. As a result, when it is determined in step S56 that the data storage amount of the first memory 48 is full,
It is determined to be "YES" and the process proceeds to step S58. In addition,
The determination in step S56 is made every time a sector, which is the minimum unit of recording, is recorded.

In step S58, after the focus jump to the second layer, which is the second signal surface of the multi-layer disc 41, the track search to the last data portion of the previous recording is performed. Then, in step S60, the selection switch (SW
1) 44 is switched to the L side, that is, the second memory 51 side, and the signal read from the second memory 51 in step S62 is recorded in the two layers. Then, step S
At 64, it is determined whether or not the amount of data stored in the second memory 51 has become empty.

In this case, if the data storage amount is not empty, a "NO" determination is made, the flow returns to step S62, and the signal read from the second memory 51 is recorded in two layers. As a result, when it is determined in step S64 that the amount of data stored in the second memory 51 is empty,
The determination is “YES”, the process returns to step S50, and the processes of steps S50 to S64 are cyclically executed. The determination in step S64 is performed every time the sector, which is the minimum unit of recording, is recorded.

As described above, writing to the first memory 48 and reading from the second memory 51 are alternately performed so that the signal is read from the first signal surface of the multilayer disc 41 and the second signal surface is read. The signal is recorded. Switching between reading and recording on the multilayer disc 41 is
The switching is performed when the amount of data stored in the first memory 48 becomes full and when the amount of data stored in the second memory 51 becomes empty. It should be noted that the "data storage amount is full" state means that there is no free space as described above, and the "data storage amount is empty" state is that there is no data to be read, as described above. The state that remains.

In the above description, the two-layer multi-layer disc is described in detail, but the three-layer multi-layer disc can also be recorded / reproduced simultaneously. In this case, the speed at which the optical pickup reproduces the signal from the multilayer disc and the speed at which the signal is recorded are faster than the sum of the speed at which the decoder reads the signal from the memory and the speed at which the encoder writes to the memory.

[0061]

Since the present invention is configured as described above, it is possible to simultaneously read out signals recorded in a plurality of layers from a multi-layer disc and simultaneously reproduce the signals.
In addition, the present invention can simultaneously record a plurality of continuously encoded signals on a plurality of layers of a multi-layer disc. Further, according to the present invention, a plurality of signals which are continuously encoded can be recorded on a multi-layer disc, and at the same time, the recorded signals can be read and continuously reproduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a disc reproducing apparatus of the present invention and a diagram showing a schematic configuration of a multilayer disc.

FIG. 2 is a diagram showing a memory storage amount and an operation timing of the disc reproducing apparatus of the present invention.

FIG. 3 is a flowchart showing an operation of the disc reproducing apparatus of the present invention.

FIG. 4 is a diagram showing a configuration of a modified example of the embodiment of the disc reproducing apparatus of the present invention.

FIG. 5 is a diagram showing the configuration of another modification of the embodiment of the disc reproducing apparatus of the present invention.

FIG. 6 is a diagram showing a configuration of an embodiment of a disc recording apparatus of the present invention.

FIG. 7 is a diagram showing a memory storage amount and an operation timing of the disk recording device of the present invention.

FIG. 8 is a flowchart showing the operation of the disc recording apparatus of the present invention.

FIG. 9 is a diagram showing a configuration of an embodiment of a disc recording / reproducing apparatus of the present invention.

FIG. 10 is a diagram showing a memory storage amount and operation timing of the disc recording / reproducing apparatus of the present invention.

FIG. 11 is a flowchart showing the operation of the disc recording / reproducing apparatus of the present invention.

[Explanation of symbols]

1,21,41 disk 2,22 42 Objective lens 3,23,43 Optical pickup 4,47 A / D converter 5,25,44 Selection switch (SW1) 6,26,45 CPU 7, 27, 46 Servo means 8, 10, 12, 28, 30, 48, 51 memory 9, 11, 13, 49 Decoder 24,52 D / A converter 29, 31, 50 encoders

Continuation of front page (56) Reference JP-A-5-342583 (JP, A) JP-A-6-103701 (JP, A) JP-A-6-139697 (JP, A) JP-A-2-185732 (JP , A) JP 63-247969 (JP, A) JP 3-150736 (JP, A) JP 5-135366 (JP, A) JP 60-202545 (JP, A) JP 61-210541 (JP, A) JP-A-7-45005 (JP, A) JP-A-6-150516 (JP, A) JP-A-6-139576 (JP, A) JP-A-5-282845 (JP, A) A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 20/10

Claims (6)

(57) [Claims] 1. A single reading means capable of reading a signal recorded on the signal surface from one side of a multi-layer disc having a plurality of signal surfaces, and the reading means reads from each layer of the plurality of layers. A plurality of storage means for storing the stored signals, a decoder for decoding the signals stored in the plurality of storage means, a reading means and a control means for controlling the plurality of storage means. , the readout signals from the multi-layer disc faster than the decoder decodes, the control means, time division and sequentially the reading means is so that the focus jump switching layer for reading the signal
The reading means controls the signals read from each layer of the multilayer disc to be stored in the storage means corresponding to each layer, and the signals stored in the plurality of storage means are supplied to the decoder without interruption. A multi-layer disc reproducing apparatus, which is controlled as described above. 2. A single recording means capable of recording a signal on the signal surface from one side of a multi-layer disc having a plurality of signal surfaces, and a signal for recording on each of the plurality of layers by the recording means. A plurality of storage means for accumulating; an encoder for encoding the signals accumulated in the plurality of storage means; and a control means for controlling the recording means and the plurality of storage means. the signal was recorded on the multilayer disk faster than encoding, said control means divisionally sequentially and said recording means is so that the focus jump switching a layer for recording a signal point,
The recording means controls the signals to be recorded in each layer of the multilayer disc so as to be read out from the storage means corresponding to the respective layers, and the signals accumulated in the plurality of storage means are supplied from the encoder without interruption. A multi-layer disc recording device characterized by being controlled as described above. 3. A single recording / reproducing device capable of recording a signal on the signal surface or reading a signal recorded on the signal surface from one side of a multilayer disc having a plurality of signal surfaces. A plurality of storage means for storing a signal to be recorded in each layer of the plurality of layers by the recording / reproducing means or a signal read from each layer of the plurality of layers; and a decoder for decoding the signals stored in the plurality of storage means And an encoder for encoding signals accumulated in the plurality of storage means, and a control means for controlling the recording / reproducing means and the plurality of storage means, wherein the recording / reproducing means is decoded by the decoder and the encoder. Alternatively, the control means records or reads a signal on the multi-layer disc faster than encoding, and the control means sequentially performs the recording / reproducing operation on a time-division basis. So that the focus switches the stage recording or reading layer a signal
The recording / reproducing means causes the signals to be recorded in the respective layers of the multilayer disc to be read from the plurality of storage means corresponding to the respective layers, or the signals read from the respective layers are caused to jump to the plurality of storage means corresponding to the respective layers. Control so that the signals are read out from the plurality of storage means without interruption, or the accumulated signals are supplied to the decoder. Multi-layer disc recording / reproducing device. 4. A signal read from each of the plurality of layers by reading a signal recorded on the signal surface from a single side of a multilayer disc having a plurality of layers of signal surfaces by a single reading means. Is stored in a plurality of storage means, the signals stored in the plurality of storage means are decoded by a decoder, the reading means and the plurality of storage means are controlled by a control means, and the speed is faster than the decoding by the decoder. reading a signal from the multi-layer disc, so that switching the layer to read the time division and sequentially signal follower
So that the signals read from each layer of the multilayer disc are stored in the storage means corresponding to each layer so that the signals stored in the plurality of storage means are supplied to the decoder without interruption. A multi-layer disc reproducing method characterized by the above. 5. A multi-layer disc having a plurality of layers of signal surfaces, from one side of the multi-layer disc, a signal is recorded on the signal surface by a single recording unit, and a plurality of storage units store signals for recording on each layer of the plurality of layers. The encoder stores the signals stored in the plurality of storage means, encodes the signals by the encoder, controls the recording means and the plurality of storage means by the control means, and outputs the signals to the multilayer disc faster than the encoder encodes. so that switching the layer for recording recorded, time division and sequentially signals follower
Signal to be recorded in each layer of the multilayer disc is read out from the storage means corresponding to each layer so that the signals accumulated in the plurality of storage means can be supplied from the encoder without interruption. A multi-layer disc recording method characterized by the above. 6. A signal is recorded on the signal surface or a signal recorded on the signal surface is read by a single recording / reproducing means from one side of a multilayer disc having a plurality of signal surfaces. A signal to be recorded in each layer of the layers or a signal read from each layer of the plurality of layers is stored in a plurality of storage means, the signals stored in the plurality of storage means are decoded by a decoder, and the plurality of storages are stored. The signal accumulated in the means is encoded by the encoder, the recording / reproducing means and the plurality of storage means are controlled by the control means, and the signal is recorded on the multilayer disc faster than the decoder or the encoder decodes or encodes. Or read out, switch the layer to record or read out signals sequentially in time division
A focus jump is performed so that a signal to be recorded in each layer of the multi-layer disc is read from the storage unit corresponding to each layer, or a signal read from each layer is accumulated in the storage unit corresponding to each layer, and the recording is interrupted. A multi-layer disc recording / reproducing method characterized by controlling the signals read from the plurality of storage means to be supplied from the encoder or the accumulated signals to be supplied to the decoder.