JP4053964B2 - Disc recording device and disc playback device - Google Patents

Description

  The present invention relates to a recording apparatus and a reproducing apparatus using a disk-shaped storage medium for data recording, and more particularly to a video data recording apparatus and a reproducing apparatus using an optical disk, a magneto-optical disk, or the like.

  2. Description of the Related Art In recent years, digital video disks that record and reproduce digital data by light or magneto-optical have become widespread as equipment for recording consumer video / audio signals.

  For such digital video discs, there are standards such as DVD-RAM, DVD-RW, and DVD + RW, and recorders using these are called digital video disc recorders.

  Hereinafter, the digital video disk recorder may be abbreviated as “disk” or “optical disk”.

  However, the recording bit rate of this optical disc is significantly slower than the maximum recording bit rate of an HDD (Hard Disk Recorder), and the amount of data that can be recorded per second is substantially equal to the reading / writing of continuous data in the case of an HDD according to the ATA100 standard. Has reached about 320 Mbps (Mbit / sec), whereas the optical disk has only about 11 Mbps at 1 × speed.

  As a result, the recording rate that can be recorded on the optical disc can be suppressed to the maximum recording bit rate. Therefore, when recording a variable bit rate with a data compression circuit such as the MPEG method, it is necessary for a scene with fine patterns and fast movement. There is a problem in that the recording bit rate is insufficient, and the resolution of the image is deteriorated to such an extent that it can be visually recognized.

  Therefore, in order to cope with such problems and increase the maximum recording bit rate of the optical (magneto-optical) disk, n (n is an integer of 2 or more) on one side of the disk and 2n optical heads on both sides are used. Thus, there has been proposed a disk device that achieves a high transfer rate with a high recording density equivalent to that of a recording method with a constant linear velocity, although it is a recording method with a constant angular velocity (see, for example, Patent Document 1).

Also, in order to improve the transfer rate during playback, n optical pickups are provided, and the spindle motor is controlled by the signal detected by the outermost optical pickup, thereby speeding up the transfer rate without breaking data transfer An optical disc apparatus and a reproducing method that can realize the above are also conventionally known (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 4-184787 JP-A-8-321125

  However, in the case of the prior art disclosed in Patent Document 1, it is assumed that recording and reproduction are performed using a plurality of optical heads, respectively. Therefore, the linear velocity constant (CLV method: recording on a disk) which is a normal data format of an optical disk is assumed. This is a recording / reproducing method that deviates from the standard of fixed pit intervals) and lacks versatility.

  In addition, the conventional technique disclosed in Patent Document 2 is merely a method of reading data from a disk at high speed using a plurality of optical pickups, so that the reproduction rate can be improved, but nothing has been considered about the improvement of the recording rate. Absent.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a disk recording apparatus and a disk reproducing apparatus in which resolution is not lowered even for a scene with a fine pattern and fast movement. There is.

  The object is to provide a plurality of recording means for recording data on a disk-shaped recording medium, a data processing means for supplying recording data to each recording means, an encoding means for reducing the amount of recording data, and a disk-shaped recording medium. Address detecting means for detecting the address of recording data to be recorded, bit rate setting means for setting the maximum recording bit rate value of the encoding means, decoding means for expanding the current maximum recording bit rate, and each means The rate control means determines that the image quality at the time of variable recording bit rate recording is deteriorated from a certain standard based on information of the means for reducing the recording data amount. When the recording means is operated in parallel in two systems, the maximum recording bit rate is increased from N to E × N (E is larger than 1 and 2 (The numerical value below) is changed so that data can be recorded, and when it is determined that the image quality is deteriorated from a certain standard, the recording means is operated in parallel in three systems, so that the maximum recording bit rate is E × N Is changed to F × N (F is a numerical value greater than 2 and less than or equal to 3), and is controlled so that data can be recorded.

  At this time, the rate control unit uses the address detection unit, the recording unit, and the data processing unit to record data in advance on a disc-shaped recording medium so that the recorded data is continuous. To achieve the above purpose even if the continuity of the recorded data and the satisfaction of the disc standard can be obtained by recording the data recorded in another area of the disc in order to increase the maximum recording bit rate in the space Can do.

  Similarly, at this time, the disk-shaped recording medium may be an optical disk or a magneto-optical disk, the recording means may be a semiconductor laser, and the encoding means may be an MPEG2 encoder.

  Another object of the present invention is to provide means for reproducing data from a disk-shaped recording medium, decoding means for reducing the amount of data recorded on the disk-shaped recording medium to the original recording data, and the highest recording of the decoding means. In the disk reproducing apparatus, comprising: a bit rate setting means for setting a bit rate value; and a rotation speed control means for controlling the rotation speed of the disk-shaped recording medium based on information of the bit rate setting means. The means is such that the rotational speed at the maximum recording bit rate N is K, and the rotational speed is always E × K when the maximum recording bit rate is E × N (E is a numerical value greater than 1 and less than 2). The disk rotation speed is fixedly controlled, and when the maximum recording bit rate is F × N (F is a value greater than 2 and 3 or less), the disk rotation speed is set so that the rotation speed is always F × K. By restoring the reproduced data to the data at the time of recording by fixing the rotation speed of the disk at the time of reproduction to either E × K or F × K according to the maximum recording bit rate recorded. Is also achieved.

  Next, the object is to reproduce data from a disk-shaped recording medium, decoding means for reducing the amount of data recorded on the disk-shaped recording medium to original recording data, and the highest of the decoding means. In a disk reproducing apparatus comprising: a bit rate setting means for setting a value of a recording bit rate; and a rotation speed control means for controlling the rotation speed of a disk-shaped recording medium based on information of the bit rate setting means. Based on the information on the maximum recording bit rate determined from the reproduction data, the control means sets the number of rotations at the maximum recording bit rate N to K, and the maximum recording bit rate is E × N (E is a numerical value greater than 1 and less than 2). ), The rotation speed is changed to E × K, and the maximum recording bit rate is F × N (F is greater than 2 and less than or equal to 3). In the disc area where the data is recorded in (Value), the number of revolutions is changed to F × K, and the number of revolutions of the disc during playback is changed as needed according to the maximum recording bit rate of the recorded data. It is also achieved by restoring the data to the data at the time of recording.

  The above object is also achieved by means for reproducing data from a disk-shaped recording medium, decoding means for restoring data recorded on the disk-shaped recording medium with a reduced amount of data to the original recording data, and the disk-shaped recording medium. Address detecting means for detecting the address of data to be reproduced, data memory means for storing data whose maximum recording bit rate exceeds N among recorded data, and maximum recording bit rate among recorded data In a disk reproducing apparatus comprising address memory means for storing addresses of data exceeding N, the maximum recording bit rate exceeds N in advance from the data memory means based on information of the address detecting means and address memory means. Data is read out, and based on the information in the address memory means, the maximum recording bit rate is N When the lower data portion is reproduced, the reproduced data is obtained by inputting the data having the maximum recording bit rate of N or less and the data of the portion having the highest recording bit rate exceeding N together to the decoding means. This is also achieved by restoring the data to the data at the time of recording.

  Further, the object is to provide a plurality of pickup means for reproducing data from the disk-shaped recording medium, a decoding means for reducing the data amount and recording the data recorded on the disk-shaped recording medium to the original recording data, and the disk-shaped recording. In a disk reproducing apparatus comprising: an address detecting means for detecting an address of data to be reproduced from a medium; and an address memory means for storing an address of data having a maximum recording bit rate exceeding N among recorded data. Based on the information in the address memory means, for data having a maximum recording bit rate of E × N (E is a numerical value greater than 1 and less than or equal to 2), the pickup means is operated in parallel in two systems, and the maximum recording bit rate is F For the data of × N (F is a numerical value greater than 2 and less than or equal to 3), the pickup means is operated in parallel in three systems, At birth, by changing the number of the pickup means, it is achieved so as to restore the reproduced data to the recording time of the data.

  At this time, the disc-shaped recording medium may be an optical disc or a magneto-optical disc, the pickup means may be a semiconductor laser, and the encoding means may be an MPEG2 encoder.

  According to the present invention, when recording data is recorded on a disc at a variable bit rate by a data compression circuit such as MPEG, for example, the maximum recording bit rate is set as is done in an optical disc device capable of recording and reproducing at present. To provide a disk recording apparatus and a disk reproducing apparatus capable of selectively increasing the maximum recording bit rate to 10 Mbps or 15 Mbps selectively even in a scene with a fine pattern and fast movement even when fixed at 5 Mbps. it can.

  Hereinafter, a disk recording apparatus and a disk reproducing apparatus according to the present invention will be described in detail with reference to embodiments shown in the drawings.

  Before describing the embodiment of the present invention, first, the recording method according to the present invention will be described in the case of recording data of bit rate N, bit rate EN, and bit rate FN on an optical disc.

  At this time, E and F are magnifications with respect to the bit rate N, where E is a numerical value greater than 1 and less than or equal to 2, that is, (1 <E ≦ 2), and then F is greater than 2. It is assumed that the numerical value is 3 or less, that is, (2 <F ≦ 3).

  First, here, E = 2 and F = 3 will be described. In this case, according to the present invention, as shown in FIG. 1A, first, a laser having a maximum recordable bit rate of N ( A semiconductor laser A) is provided for main recording.

  Next, in addition to this laser A, a plurality of semiconductor lasers having the same performance, that is, the highest recordable bit rate N, such as two lasers B and C, are provided. Lasers B and C are not operated, and recording is performed using only the main recording laser A.

  If there is a case where it is desired to increase the recording bit rate from the maximum recording bit rate N during the recording by the laser A, first, the operation of the laser B and its related circuit is started.

  Then, at this time, the maximum recording bit rate N of the laser A + the maximum recording bit rate N of the laser B, and the maximum recording bit rate can be increased to 2N (E = 2).

  Next, during recording with these two lasers A and B, if it is desired to further increase the recording bit rate from the maximum recording bit rate 2N, the operation of the laser C and related circuits is also started.

  In this case, the maximum recording bit rate N of the laser A + the maximum recording bit rate N of the laser B + the maximum recording bit rate N of the laser C, so that the maximum recording bit rate can be increased to 3N (F = 3). .

  For this reason, when data is recorded from the inner periphery to the outer periphery of the disk by laser A, recording by lasers B and C is performed separately from storage area A by laser A, as shown in FIG. Area B and recording area C are secured in advance. In these areas B and C, when it is desired to record the data, the data to be recorded is further overwritten by the laser A.

  Here, the region A is partitioned from the inner periphery of the circular boundary line As to the outer periphery of the boundary line Ae, the region B is partitioned from the inner periphery of the boundary line Bs to the outer periphery of the boundary line Be, and the region C is separated from the boundary line Cs. It is delimited by the outer periphery of the boundary line Ce from the inner periphery.

  In addition, the management information recording area shown in FIG. 1 (a) is mainly in the innermost part of the disc, separately from the recordable / reproducible area added by the user in advance or later. This is an area that is secured, and the base refers to a mechanism that holds a laser, as will be described in detail later.

  Next, FIG. 2 shows the movement of the lasers A, B, and C and the formation status of the recording pit row on the disc. At this time, the pit (recording pit) is a hole that is drilled by the laser on the disc. Thus, when “0” and “1” of recording data continue alternately, the data is formed as indicated by a black circle at the position of data “1”.

  The base shown here is usually a mechanism called a carriage actuator that holds the laser and moves it in the radial direction of the disk, so that laser A is in area A and laser B is in area. In B and laser C is moved in region C, respectively.

  Here, in FIG. 2, the pit interval in the area A in the recording pit row is a constant linear velocity (CLV) recording adopted in a recordable / reproducible DVD, and a pit when high density recording is possible. It represents the distance (distance between a certain pit and the next pit).

  At this time, the number of revolutions (rotation speed) of the disc is controlled by the CLV method so that the pit interval in the region A becomes a predetermined constant interval, so the pit interval in the region B is the pit interval in the region A. For the same reason, the pit interval in the region C becomes wider than the pit interval in the region B.

  Therefore, the area B and the area C on the disc do not satisfy the standard according to the CLV recording method. However, since these areas are later overwritten with new recording data by the laser A, it is not wasted. .

  Further, when reproducing the data in the areas B and C on the disc, since the data are reproduced simultaneously by the lasers A, B and C if necessary, it is not necessary to change the rotation speed of the disc between the areas B and C.

  Next, an embodiment of the disk recording apparatus according to the present invention will be described with reference to FIGS. 3a and 3b. This is a block diagram of an embodiment in the case of the maximum recording bit rate 3N, and FIG. It is the figure which showed the relationship between the total recording area of a medium, and the recording position of laser A, B, C.

  Here, the case where an optical disc capable of recording / reproducing digital data according to the DVD standard is used as the main storage medium, but the present invention is not limited to this.

  Further, the recording rate at this time can be set to any desired magnification such as 1.1N, 1.5N, or 2.3N when the recording bit rate is increased from N, for example. However, here, in order to simplify the description, a case of improving from N to 2N and 3N will be described as an example.

  In FIG. 3a, reference numeral 1 denotes a recording rate expansion circuit which functions as a main control unit, and details will be described later. Reference numeral 2 denotes an MPEG2 encoder, which is a circuit generally used for reducing the amount of moving image data.

  Reference numeral 3 denotes a bit rate N setting unit which allows the user to arbitrarily set the normal recording bit rate N to 2N or 3N from the outside. When the recording bit rate exceeds N, the maximum recording bit rate is set to 2N or 3N. The control signal for limiting is output to the recording rate expansion circuit 1.

  In the following, 4 is a disk address detection circuit, which detects the address on the disk and always indicates the current address, and 5A, 5B and 5C are recording / reproduction data processing circuits A, B and C, respectively. The digital parallel data, which is the output of, is converted into serial data, and processing such as modulation / demodulation is performed to reduce the DC component so that it can be easily recorded on the disk.

  At this time, the recording / playback data processing circuit 5A controls the recording / playback pickup 6A, the recording / playback data processing circuit 5B controls the recording / playback pickup 6B, and the recording / playback data processing circuit 6C controls the recording / playback pickup 6C. Control.

  Here, the recording / reproducing pickups 6A, 6B, and 6C are lasers (semiconductor lasers) A, B, and C for recording data on the disc, and pickups A, B, and C for reproducing the data recorded on the disc, respectively. Both C are provided.

  Next, the details of the recording rate expansion circuit 1 will be described. As shown in the drawing, the recording rate calculation circuit 11, the bit rate 2N detection unit 12, the bit rate 3N detection unit 13, the PU A / B address memory 14, A PU A / C address memory 15, circuits A, B, and C control unit 16, and a pickup control unit 17 are included.

  First, the recording rate calculation circuit 11 functions to calculate the recording rate and pass a control signal to the next stage circuit. Next, the bit rate 2N detector 12 receives the output of the recording rate calculation circuit 11. When the bit rate becomes 2N, the control signal is passed to the next stage circuit, and the bit rate 3N detector 13 delivers the control signal to the next stage circuit when the bit rate becomes 3N. do.

  Further, the PU A / B address memory 14 serves to store the addresses of the recording / reproducing pickups 6A and 6B when the bit rate becomes 2N, and the PU A / C address memory 15 sets the bit rate to 3N. In this case, the recording / reproducing pickups 6A, 6B and 6C are stored.

  The circuits A, B, C control unit 16 operates the recording / playback data processing circuits 5A, 5B, 5C in accordance with the maximum recording bit rate set values N, 2N, 3N, and the pickup control unit 17 In conjunction with the recording / playback data processing circuits 5A, 5B and 5C, the recording / playback pickups 6A, 6B and 6C which are located ahead of the recording / playback data processing circuits 5A, 5B and 5C are operated.

  By the way, since the MPEG2 encoder 2 may use a well-known general circuit, its detailed description is omitted. Briefly, first, 21 is a motion detection circuit, which detects the motion of an image. Next, 22 is a prediction memory which temporarily stores the data of the previous image.

  Reference numeral 23 denotes a DCT, which decomposes the frequency components of the data, 24 is a quantization unit, weights the data by the frequency components, 25 is an inverse quantization unit, and performs inverse quantization opposite to the quantization unit 24. No. 26 is an IDCT, which returns the frequency component of the decomposed data to the original state.

  Next, 27 is a variable length encoding unit, 28 is a buffer memory, the buffer memory 28 serves to temporarily store recording data, and 29 is a rate control unit for recording by frequency components. Control the rate increase or decrease.

  Next, a control procedure for improving the recording bit rate only when necessary in the embodiment of FIG. 3a will be described with reference to FIG. At this time, data is recorded from the inner periphery to the outer periphery of the disc.

  During recording, recording is usually started from the innermost boundary line As of the disk of FIG. 1 by one recording laser (laser A in the recording / reproducing pickup 6A).

  At this time, in the disk of FIG. 1, a groove having a width of less than 1 μm (micrometer) is continuously carved in a spiral shape from the boundary line As to the boundary line Ce. When A is “1”, the laser A is turned on, pits are formed as shown by black circles (●) in FIG. 2, and when the recorded data is “0”, the laser A is turned off and data is recorded.

  Here, No. 1 to No. 7 in FIG. 4 are straight lines for easy understanding of the spiral grooves extending from the boundary line As to the boundary line Ce of the disk.

  D1 in FIG. 4 represents a data chunk (for example, a data block of 11 Mbit), and D2-1, D2-2, and D2-3 are two data chunks of D2. In the case of recording as described above, D2-1 is recorded when recording in the area A, D2-2 is recorded when recording in the area B, and D2-3 is recorded when recording in the area C.

  In FIG. 4, when it is desired to increase the recording bit rate of No. 1 data D2 to 2 times (2N), as shown in No. 2, it is attached to the outer peripheral portion of the data rather than the recording / reproducing pickup 6A. Then, the laser B in the recording / reproducing pickup 6B is operated to record D2-2.

  If the recording bit rate is not 2N, as shown in No. 3, the laser C in the recording / reproducing pickup 6C attached to the outer peripheral portion is further operated from the laser B to record D2-3. To do.

  Here, when the recording bit rate of data D3 to be recorded next returns to N, as shown in No. 4, a space for recording data D2-2 and data D2-3 later (☆ in region A) D3 and after are recorded with a blank mark).

  At this time, the data recorded by the lasers B and C is data for temporary recording, and these data (D2-1, D2-2, D2-3) are re-recorded in a continuous form later. Leave space to do it.

  Next, when it becomes necessary to increase the recording bit rate of the data D5 to 2N, the data D5-2 is further recorded after the data D2-2 as shown in No. 5. At this time, there is no need to increase the recording bit rate of the data D5 to 3N. Therefore, as shown in the next No. 6, a space for recording the data D5-2 later (the portion marked with a asterisk in the figure) is provided. This is recorded as data D6.

  On the other hand, when recording is interrupted, data D2-2, D2-3, and D5-2 are added later to the portions marked with * as shown in No. 7.

  That is, in this embodiment, the data recorded by the lasers B and C is only temporarily recorded, and the data D2-1, D2-2, D2-3 and the data D5 in the form of continuous data later. After re-recording to be -1, D5-2, the data is overwritten as a normal data recording area.

  At this time, when the recording of the current recording data reaches the boundary line Ae, the recording is continued while overwriting the area B and the area C as it is. Although the rate cannot be increased from N, there is no free space where no data is recorded on the disc.

  Next, the disk recording apparatus according to an embodiment of the present invention will be described in more detail with reference to FIG. 3A. First, image (recording) data is input to the MPEG2 encoder 2. Here, the MPEG2 encoder 2 is the same as that generally used as a whole.

  At this time, the rate control unit 29 inputs an N signal arbitrarily set by the user from the bit rate N setting unit 3, and thereby sets the maximum recording bit rate at the time of variable bit rate recording in this embodiment to N. Put into operation.

  Here, the MPEG2 encoder 2 in this embodiment is different from the conventional circuit in that the quantization circuit 24 is operated as it is without limiting the rate by the rate control unit 29 until the maximum recording bit rate is 3N. And a buffer memory 28 having a large storage capacity.

  First, when the maximum recording bit rate is 2N or less, the output signal of the recording rate calculation circuit 11 is input from the bit rate 2N detector 12 to the PU A / B address memory 14, and the laser A and laser at this time The address of B is stored in the PU A / B address memory 14.

  As a result, the circuits A, B, and C control unit 16 and the pickup control unit 17 record the data D5-1 of No. 5 in FIG. 4 by the laser A of the recording / playback data processing circuit 5A and the recording / playback pickup 6A, for example. At the same time, at the same time, the recording / reproducing data processing circuit 5B and the laser B of the recording / reproducing pickup 6B are operated to record the data D5-2.

  At this time, as apparent from the buffer memory output T1a (recording) in the time chart of FIG. 5a, assuming that the required clock frequency is CLK when the maximum recording bit rate is N, the data in the buffer memory 28 of FIG. It is understood that it is necessary to read the data by doubling the clock frequency, that is, increasing it to 2CLK. Similarly, the recording / playback data processing circuits 5A and 5B need a circuit for reducing the data rate of 2N to the data rate N. I understand that.

  That is, when the data of the buffer memory 28 is output at the timing T1a, the data of D5-1 and D5-2 are slightly delayed by the recording / playback data processing circuit 5A and the recording / playback data processing circuit 5B, respectively, and the time T2a It is output at the timing of time T3a and is recorded at the corresponding addresses in the area A and area B of the disc by the laser A and laser B, respectively.

  In FIG. 3a, when the maximum recording bit rate is up to 3N, an output signal is supplied from the recording rate calculation circuit 11 to the bit rate 2N detection unit 12 and the bit rate 3N detection unit 13.

  The addresses of laser A, laser B, and laser C at this time are stored in the PU A / B address memory 14 and the PU A / C address memory 15, and the circuit A, B, C control unit 16 and the pickup control unit 17 are stored. The recording / playback data processing circuit 5A and the laser A, for example, simultaneously record the data D2-1 in FIG. 4 and operate the recording / playback data processing circuit 5B and the laser B to record the data D2-2. At the same time, the recording / reproducing data processing circuit 5C and the laser C are operated to record data D2-3.

  At this time, as is clear from the time chart (T1a) in FIG. 5a, the data in the buffer memory 28 in FIG. 3 also needs to be read by increasing the frequency to the 3CLK clock, and the recording / playback data processing circuit 5A, It can be seen that a circuit for reducing the data rate of 3N to the data rate of N is required in 5B and 5C.

  Thus, when data is read from the buffer memory 28 at the timing T1a, the data D2-1 and D2-2, and the data D2-3 are recorded on the recording / playback data processing circuit 5A and the recording / playback data processing circuit 5B, respectively. The re-data processing circuit 5C outputs the signals at timings T2a, T3a, and T4a that are slightly delayed, and records them at the addresses corresponding to the areas A and B of the disc and the areas C of the disk by the laser A, laser B, and laser C, respectively.

  4 are recorded in advance by vacating the portions marked No. 4 to No. 6 in FIG. 4 (D2-2, D2-3 and D5-2), and when the recording operation is interrupted after D6 in FIG. As shown in .7, the data is moved from region B and region C to region A.

  Therefore, this operation is referred to as data alignment, and the operation during data alignment will be described below with reference to FIG. 3b. Here, FIG. 3b is different from FIG. 3a only in the direction of data in the recording / reproducing pickups 6B and 6C and the recording / reproducing data processing circuits 5B and 5C.

  First, the operation when the data D2-2 in the region B and the data D2-3 in the region C are moved after the data D2-1 in the region A will be described.

  First, the pickups in the recording / playback data processing circuit 5B and the recording / playback pickup 6B are performed by the circuits A, B, C control unit 16 and the pickup control unit 17 based on the addresses stored in the PU A / B address memory 14. Turn B on.

  Then, the data of D2-2 is reproduced by the pickup B and transmitted to a buffer memory (not shown) in the recording / reproducing data processing circuit 5A.

  Further, at the same time as reproducing the data of D2-2, the recording / reproducing data processing circuit 5C is connected by the circuit A, B, C control unit 16 and the pickup control unit 17 based on the address stored in the PU A / C address memory 15. The pickup C in the recording / reproducing pickup 6C is turned on to reproduce the data of D2-3 and transmit it to a buffer memory (not shown) in the recording / reproducing data processing circuit 5A.

  When the data of D2-2 and D2-3 are stored in each buffer memory, the circuit A, B, C control unit 16 and the A / B address memory 14 are also based on the addresses stored in the PU A / B address memory 14. The pickup controller 17 turns on the laser A in the recording / playback data processing circuit 5A and the recording / playback pickup 6A, and D2-2, D2-3 as shown in the area A of No. 7 in FIGS. The data of will be recorded.

  As for the data D5-2 of the area B, the data of D5-2 is reproduced from the area B by the pickup B as shown in the area A of No. 7 in FIGS. Write in the appropriate part of.

  At this time, if the recording area of the laser A reaches the boundary line Bs in the middle, the recorded data D2-2, D5-2,... Continue recording in

  By controlling the amount of data recorded by lasers A, B, and C to be less than the maximum amount of data that can be recorded on the disc by the CLV method, a useless area on the disc is prevented from being generated. it can.

  Next, a disk reproducing apparatus according to an embodiment of the present invention for reproducing data arranged on a disk as described above by the disk storage apparatus according to the present invention will be described in detail with reference to the illustrated embodiments. To do.

  FIG. 6 shows an embodiment of a disc playback apparatus according to the present invention. This embodiment differs from the embodiment described in FIGS. 3a and 3b in that an MPEG2 decoder 7, a disc rotation speed control circuit 8, and an MPEG2 decoder. 7 is provided with a variable length decoding unit 30 and in the data direction.

  At this time, each of the pickups A, B, C of the recording / reproducing pickups 6A, 6B, 6C and each of the recording / reproducing data processing circuits 5A, 5B, 5C and means for reproducing the data as claimed in claim are provided. Constitute.

  First, the MPEG2 decoder 7 functions to decompress the data compressed by the MPEG2 encoder generally used for reducing the moving image data amount and restore the original image data.

  The MPEG2 decoder 7 is different from the variable-length decoder unit 30, but the other parts are composed of the same circuit as the MPEG2 encoder 2 of FIG.

  Next, the disk rotation speed control circuit 8 functions to control the disk rotation speed in accordance with the maximum recording bit rate, and the disk rotation speed set by the bit rate N setting circuit 3 in FIG. For double speed (bit rate 3N, that is, FN), the rotational speed of the disk is increased to 3K if the rotational speed of the disk is tripled, that is, if the normal rotational speed is K.

  In the first procedure for reproducing the data arranged on the disc according to this embodiment, the recording / reproducing pickup 6A is operated under the disc rotation speed 3K, that is, under the variable bit rate system. Only the data reproduction pickup A, the recording / reproducing data processing circuit 5A, and the MPEG2 decoder 7 are turned on, and the data recorded at the maximum recording bit rate 3N is reproduced at the triple speed as indicated by T2c in FIG. 7a.

  Then, in No. 7 in FIG. 4, the data reproduction capability can be tripled within a certain time (3T), and the data (D2-1, D2-2, D2-3) having a maximum recording bit rate of 3N can be obtained. ) Can be processed within 3T time, and the recorded data can be restored to the original data.

  At this time, it is needless to say that the clocks in the recording / reproducing data processing circuit 5A and the MPEG2 decoder 7 are also required to be three times the frequency. As a result, when the maximum recording bit rate is 2N (EN), the rotational speed of the disk is naturally 2K (E = 2), and the clocks in the recording / playback data processing circuit 5A and the MPEG2 decoder 7 are also E times. That is, the frequency must be doubled.

  By the way, also in the first procedure, as described below, a procedure of reproducing at double speed and triple speed only near the maximum recording bit rate 2N or 3N on the disc can be considered.

  In the case of this procedure, first, in FIG. 6, the header of the data in the buffer memory 28 (information such as the recording rate at the head of the user recording data) is checked by the rate control unit 29, and there is a portion recorded at the bit rate 3N. Check whether or not.

  If there is a portion recorded at a bit rate of 3N, the disk rotation speed control circuit 8 is activated to increase the disk rotation speed to triple speed, that is, the rotation speed is increased to 3K, and the pickup A in the recording / reproducing pickup 6A. Then, the recording / playback data processing circuit 5A and the MPEG2 decoder 7 are turned on.

  At this time, the clock in the recording / playback data processing circuit 5A and the MPEG2 decoder 7 is also set to a triple frequency, and the data recorded at the maximum recording bit rate 3N is tripled as shown in T2c of FIG. 7a. Play it.

  As a result, as shown in No. 7 of FIG. 4, the ability to reproduce data within a certain time can be tripled, and data D2-1 having a maximum recording bit rate of 3N, D2-2 and D2-3 can be processed within the time 3T to restore the original recorded data.

  Therefore, when the maximum recording bit rate is 2N, it goes without saying that the number of rotations of the disk is doubled, and the clocks in the recording / reproducing data processing circuit 5A and the MPEG2 decoder 7 must be doubled.

  By the way, in the case of the above procedure, it is difficult to rotate the disc at 2x speed or 3x speed (fixed) during playback operation, or to change to 1x speed, 2x speed, or 3x speed in the middle. In reality, it is desirable to follow the second procedure described below.

  In the first procedure described above, the data D2-1, D2-2, and D2-3 are 3 for the data D2-1, D2-2, and D2-3 even when the disk is always set to double or triple speed during playback and when the speed is changed during playback. The speed is set to double speed, and the data D5-1 and D5-2 are set to double speed.

  Here, the bit rate of 2N or 3N is necessary only for a part of the recording area of the disc, as indicated by the asterisk mark No. 7 in FIG. Therefore, in the second procedure, the embodiment shown in FIG. 8 is used, and the normal speed (K) is set when the power is turned on or the data reproduction is started only for the data D2-2, D2-3, and D5-2 in the portion marked with *. ) And stored in advance in the memory, and later restore the data together with D2-1 and D5-1.

  The embodiment of FIG. 8 is obtained by adding a shock proof memory 9 to the embodiment of FIG. 6. At this time, the shock proof memory 9 temporarily stores data for the data processing circuit after the reproduction data of FIG. This is a memory different from the buffer memory 28 having the role of storing in the memory, and other configurations are not changed.

  In this shock proof memory 9, data D2-2, D2-3, D5-2 of the portion marked with * are stored in advance, and the data D2-1 and D5-1 are stored as indicated by TM in FIG. 7b. Immediately before playback, the data is read from the shock proof memory 9 and transferred to the buffer memory 28.

  Then, as shown in T2d of FIG. 7b, the data D2-1 and D5-1 output from the recording / playback data processing circuit 5A are combined, and the same as the original data, as shown in T1a of FIG. 5a. To be restored.

  In this way, it is not necessary to always allow a disc having a high recording bit rate part to be driven at 2x or 3x speed to allow useless power consumption. In particular, it is possible to eliminate the need for difficult control such as setting the rotational speed of the disk to double speed or triple speed.

  By the way, in the above embodiment, data with a recording bit rate exceeding N is continuously aligned on the disk. Here, the laser A reaches the last boundary line Ae of the area A in FIG. In this case, the data recording can be ended and the areas B and C can be left.

  Therefore, an embodiment of the disk recording apparatus and disk reproducing apparatus according to the present invention in which the areas B and C of the disk are left as described above will be described below.

  First, FIG. 9 is a diagram showing the relationship between the total recording area of a recording medium such as a disk and the recording positions by lasers A, B, and C, and FIG. 10 is another example of the disk reproducing apparatus according to the present invention. It is a block diagram which shows embodiment.

  At this time, in the embodiment of FIG. 10, in the embodiment of FIG. 6, the disk rotation speed control circuit 8 is removed from them, and the bus from the recording / playback data processing circuits 5A, 5B, 5C to the buffer memory 28 is provided. Three systems are provided separately, and the other configurations are the same.

  In this embodiment, the recording rate can be controlled to the minimum necessary, for example, when the recording bit rate is increased from N, such as 1.1N, 1.5N, and 2.3N. In the embodiment, in order to simplify the description, a case where the recording bit rate is improved from N to 2N and 3N will be described.

  In this embodiment, the data alignment described with reference to FIG. 3B is not performed during recording. That is, the data D3 is recorded after the data D2-1 on the disc as shown in the area A of No. 7 in FIG. 9 without leaving the portion marked with a star in the area A of No. 7 in FIG. . Similarly, data D6 is recorded after data D5-1 on the disc.

  Accordingly, also in this embodiment, during recording, the recording / reproducing data processing circuits 5A, 5B, 5C and the recording / reproducing pickups 6A, 6B, 6C are operated as in the case of FIG. As shown in FIG. 9, data D2-1, D2-2, and D2-3 are simultaneously recorded on the disc.

  The data D5-1 and D5-2 are also recorded simultaneously by operating the recording / reproducing data processing circuits 5A and 5B and the lasers A and B of the recording / reproducing pickups 6A and 6B, as shown in FIG. Will do.

  Then, at the time of reproduction, for example, at the time of reproduction of data D2-1 or D5-1, the recording / reproducing data processing circuits 5B and 5C and the recording / reproducing pickups 6B and 6C in FIG. 10 are operated, and the data D2-2 and D2-3 are operated. And data D5-2, as shown by T2e, T3e, and T4e in FIG. 7c, data D2-1, D2-2, and D2-3 and data D5-1 and D5-2 are simultaneously input to the buffer memory 28. It controls so that.

  Therefore, the embodiment of the disk recording apparatus and the disk reproducing apparatus according to the present invention includes an optical disk or magneto-optical disk as a disk-shaped recording medium, a semiconductor laser as a recording means, a semiconductor pickup as a reproducing means, and MPEG2 as a means for reducing the amount of recorded data This method can be applied to general digital video disk recorders such as DVD-RAM, DVD-RW, and DVD + RW.

  Here, as described above, generally, when data is recorded at a variable recording bit rate by the MPEG2 system, for example, when recording on an optical disc at a variable recording bit rate with an upper limit of the bit rate of 5 Mbps, In severe scenes, the resolution is poor.

  However, according to the above-described embodiment of the present invention, it is possible to record at 10 Mbps or 15 Mbps as necessary only in a scene with intense movement, so that deterioration in image quality of a scene with intense movement can be minimized.

  Further, according to one embodiment of the disk recording apparatus described above, for example, the recording data of a part exceeding the maximum recording bit rate of 5 Mbps is temporarily recorded in another area of the disk, and the recording data of the part exceeding is recorded later. Since the data is rearranged after reading, the continuity of the recording data and the CLV standard of the optical disk or magneto-optical disk can be satisfied.

  Also, according to one embodiment of the above-described disk reproducing apparatus, a disk that has been recorded at a maximum recording bit rate of 15 Mbps is reproduced by a single pickup, so that a normal rotation of a disk recorded at the maximum recording bit rate of 15 Mbps is performed. When the number is K, since the data is reproduced with the rotation speed of the disk fixed at 3K during reproduction, the original recorded data can be restored from the disk on which the data with the maximum recording bit rate of 15 Mbps is recorded.

  Also, according to one embodiment of the above-described disk reproducing apparatus, a disk that has been recorded at a maximum recording bit rate of 15 Mbps is reproduced by a single pickup, so that a normal rotation of a disk recorded at the maximum recording bit rate of 15 Mbps is performed. When the number is K, only the recorded portion at the maximum recording bit rate of 15 Mbps at the time of playback is played back by increasing the disc rotation speed to 3K. The original recorded data can be restored from the disk on which the data with the rate of 15 Mbps is recorded.

  Also, according to one embodiment of the above-described disk reproducing apparatus, a disk that has been recorded at a partly maximum recording bit rate of 15 Mbps is reproduced by a single pickup. The data of the portion where the maximum recording bit rate exceeds N is read out, temporarily stored in the semiconductor memory, and when the portion of the data having the maximum recording bit rate of N or less that is paired with the data is reproduced, these two are put together. As a result, recorded data having a maximum recording bit rate of 3N can be reproduced without increasing the rotational speed of the disk and consuming unnecessary power.

  Further, according to one embodiment of the above-described disk reproducing apparatus, the data of the portion where the maximum recording bit rate exceeds 5 Mbps is not aligned, and is read out simultaneously with two or three pickups and restored to the original recording data. Therefore, it is possible to reproduce the recorded data in the portion where the maximum recording bit rate exceeds 5 Mbps without increasing the rotational speed of the disk and consuming unnecessary power.

  In the embodiment described above, the MPEG2 system is adopted as the data compression system used to improve the maximum recording bit rate. However, the present invention can be implemented by other data compression systems. Needless to say.

  Incidentally, in the above embodiment, the maximum recording bit rate when data is recorded on an optical disk or a magneto-optical disk is increased. Here, the disk recording apparatus and the disk reproducing apparatus according to the present invention are hereinafter referred to as HDDs. The case where it is used for data backup of (hard disk decoder) will be described.

  When an optical disk is used for HDD data backup, the HDD has a higher data transfer speed. Therefore, when copying a large capacity data file, the optical disk cannot keep up with the recording speed of the HDD.

  Even so, it is possible to reproduce the recorded HDD data later and record it on the optical disk, or to have a lot of built-in memory in the optical disk for temporary data saving.

  However, if the HDD is down during playback of recorded data, the former cannot be backed up, and the latter increases both circuit scale and cost due to the large number of built-in memories. It can not be said.

  If the apparatus according to the above-described embodiment is used for HDD data backup at this time, in this case, first, the MPEG2 encoder 2 is not required in the embodiment of FIG. When the bit rate is set to 3N, as described above, the data in the HDD can be recorded at a triple speed by using the method of later aligning the data in the areas B and C of the disk with the area A. Pack up is possible.

  When this data is reproduced, since the data is only backed up, it is not necessary to reproduce the data within a predetermined time as in the case of MPEG2 described above. It is only necessary to turn on the disc and rotate the disc at a normal speed.

It is explanatory drawing of the positional relationship of the disc and laser in this invention, and the recording area of a disc. It is explanatory drawing showing the position of the laser at the time of a recording start and a recording end. It is a block diagram which shows one Embodiment when the disk recording device based on this invention is set to the highest recording bit rate 3N operation | movement. 1 is a block diagram showing an embodiment when a disk recording apparatus according to the present invention is operated when data is aligned. FIG. It is explanatory drawing showing the relationship between the total recording area of a recording medium, and the recording position by laser A, B, C. 6 is a time chart for explaining an operation during recording by an embodiment of the disk recording apparatus according to the present invention. It is a time chart for demonstrating the operation | movement at the time of the data rearrangement by one Embodiment of the disc recording device based on this invention. It is a block diagram which shows one Embodiment when the disc reproducing | regenerating apparatus concerning this invention is made into N times speed data reproduction operation | movement. 6 is a time chart for explaining an operation at the time of 3 × speed reproduction by an embodiment of the disk reproducing apparatus according to the present invention. 4 is a time chart for explaining an operation when using a shock-proof memory according to an embodiment of the disk reproducing apparatus according to the present invention. It is a time chart for demonstrating operation | movement when leaving the area | regions B and C by one Embodiment of the disc reproducing | regenerating apparatus based on this invention. It is a block diagram which shows one Embodiment when the disc playback apparatus based on this invention is made into operation using shock proof memory. It is explanatory drawing showing the relationship between the total recording area of a recording medium, and the recording position by laser A, B, C. It is a block diagram which shows one Embodiment when the disc reproducing | regenerating apparatus based on this invention is set to the operation | movement which leaves the area | regions B and C.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Recording rate expansion circuit 2 MPEG2 encoder 3 Bit rate N setting part 4 Disk address control circuit 5A Recording / reproducing data processing circuit A
5B Recording / playback data processing circuit B
5C Recording / playback data processing circuit C
6A Recording / playback pickup A
6B Recording / playback pickup B
6C Recording / playback pickup C
7 MPEG2 decoder 8 disc rotation speed control circuit 9 shock proof memory 11 recording rate calculation circuit 12 bit rate 2N detection unit 13 bit rate 3N detection unit 14 PU A / B address memory 15 PU A / C address memory 16 circuits A, B, C control unit 17 pickup control unit 21 motion detection circuit 22 prediction memory 23 DCT
24 Quantizer 25 Inverse Quantizer 26 IDCT
27 Variable length encoding unit 28 Buffer memory 29 Rate control unit 30 Variable length decoding unit

Claims (8)

A plurality of recording means for recording data on a disk-shaped recording medium, a data processing means for supplying recording data to each recording means, an encoding means for reducing the amount of recording data, and a recording medium for recording on a disk-shaped recording medium Address detecting means for detecting an address of data, bit rate setting means for setting a maximum recording bit rate value of the encoding means, decoding means for expanding the current maximum recording bit rate, and rates for controlling the respective means In a disk recording device comprising a control means,
The rate control means includes
When it is determined that the image quality at the time of variable recording bit rate recording is deteriorated from a certain standard based on the information of the means for reducing the recording data amount, the recording means is operated in two systems in parallel, and the maximum recording bit rate is changed from N Change to E × N (E is a numerical value greater than 1 and less than or equal to 2) to control data recording
Further, when it is determined that the image quality is deteriorated from a certain standard, the recording means is operated in parallel in three systems,
A disk recording apparatus characterized in that the maximum recording bit rate is changed from E × N to F × N (F is a numerical value greater than 2 and 3 or less) so that data can be recorded. The disk recording apparatus according to claim 1, wherein
The rate control means uses the address detection means, the recording means, and the data processing means,
By recording data on a disc-shaped recording medium with a space in advance so that recorded data is continuous, and recording the data recorded in another area of the disc in order to increase the maximum recording bit rate,
A disc recording apparatus characterized in that continuity of recording data and satisfaction of disc standards can be obtained. The disk recording apparatus according to claim 1, wherein
The disc-shaped recording medium is an optical disc or a magneto-optical disc,
The recording means is a semiconductor laser;
A disk recording apparatus characterized in that the encoding means is an MPEG2 encoder. A means for reproducing data from a disk-shaped recording medium, a decoding means for restoring data recorded on the disk-shaped recording medium with the data amount reduced, and a value of the maximum recording bit rate of the decoding means are set. A disc playback apparatus comprising: a bit rate setting unit that controls the rotation rate of the disc-shaped recording medium based on information of the bit rate setting unit;
The rotation speed control means includes
The rotational speed at the highest recording bit rate N is K, and when the highest recording bit rate is E × N (E is a numerical value greater than 1 and less than 2), the rotational speed of the disc is always E × K. Fixed control,
When the maximum recording bit rate is F × N (F is a value greater than 2 and less than or equal to 3), the disc rotation speed is fixedly controlled so that the rotation speed is always F × K.
By fixing the number of revolutions of the disc at the time of playback to either E × K or F × K according to the recorded maximum recording bit rate,
A disc reproducing apparatus for restoring reproduced data to data at the time of recording. A means for reproducing data from a disk-shaped recording medium, a decoding means for restoring data recorded on the disk-shaped recording medium with the data amount reduced, and a value of the maximum recording bit rate of the decoding means are set. A disc playback apparatus comprising: a bit rate setting unit that controls the rotation rate of the disc-shaped recording medium based on information of the bit rate setting unit;
The rotation speed control means includes
Based on the information on the maximum recording bit rate determined from the reproduced data, the number of rotations at the maximum recording bit rate N is K, and the maximum recording bit rate is E × N (E is a numerical value greater than 1 and less than 2). In the recorded disc area, change the rotation speed to E × K,
In the disk area where data is recorded with the maximum recording bit rate of F × N (F is a numerical value greater than 2 and less than 3), the rotational speed is changed to F × K,
By changing the number of revolutions of the disc at the time of playback according to the maximum recording bit rate of the recorded data,
A disc reproducing apparatus for restoring reproduced data to data at the time of recording. Means for reproducing data from the disk-shaped recording medium; decoding means for restoring data recorded on the disk-shaped recording medium with the data amount reduced; and an address of data reproduced from the disk-shaped recording medium. Address detecting means for detecting, data memory means for storing data having a maximum recording bit rate exceeding N among recorded data, and data having a maximum recording bit rate exceeding N among recorded data In a disk playback device comprising address memory means for storing addresses,
Based on the information of the address detecting means and the address memory means, data having a maximum recording bit rate exceeding N is previously read from the data memory means,
Based on the information in the address memory means, when the data portion having the maximum recording bit rate of N or less is reproduced, the data having the maximum recording bit rate of N or less and the data of the portion where the maximum recording bit rate exceeds N Are collectively input to the decoding means,
A disc reproducing apparatus configured to restore reproduced data to data at the time of recording. A plurality of pickup means for reproducing data from the disk-shaped recording medium; a decoding means for reducing the amount of data recorded on the disk-shaped recording medium to restore the original recording data; and data for reproducing from the disk-shaped recording medium In a disk reproducing apparatus comprising address detecting means for detecting an address and address memory means for storing an address of data having a maximum recording bit rate exceeding N among recorded data,
Based on the information in the address memory means, the pickup means is operated in parallel in two systems for data having a maximum recording bit rate of E × N (E is a numerical value greater than 1 and less than 2),
For data with a maximum recording bit rate of F × N (F is a numerical value greater than 2 and less than or equal to 3), the pickup means is operated in parallel in three systems,
By changing the number of pickup means during playback,
A disc reproducing apparatus configured to restore reproduced data to data at the time of recording. The disc reproducing apparatus according to any one of claims 4 to 7,
The disc-shaped recording medium is an optical disc or a magneto-optical disc,
The pickup means is a semiconductor laser;
A disk reproducing apparatus characterized in that the encoding means is an MPEG2 encoder.

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