JPH076498A - Recording medium - Google Patents

Abstract

PURPOSE:To record data on a disk by setting the transfer rate of data to be reproduced. CONSTITUTION:Reproducing data obtained by reproducing the management file on the inner pheriphery of an optical disk 1 with a pick-up 2 and obtained through a waveform shaping circuit 4, a data decoding circuit 6 and an error correcting circuit 7 are divided in a data dividing circuit 9 to be stored in a memory 10. A control circuit 11 control the reference signal frequency of a reference signal generation circuit 14 and a reproducing data speed by discriminating the read-out mode at the time of the storaging when the pick-up 2 is reproducing the data file.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium which specifies a data reproducing speed when reproducing a recording track on which data is recorded.

[0002]

2. Description of the Related Art The reproduction speed (reproduction bit rate) of data recorded on an optical disk is fixed according to the standard. Therefore, the file data recorded on the optical disc is composed of data that functions at a speed equal to or lower than the standardized reproduction speed.

[0003]

However, among files, there is a file in which the data transfer speed is set high and the reproduction data is processed at high speed. Therefore, it is necessary to set the transfer rate of the data to be reproduced to a desired rate according to the file.

[0004]

Therefore, the first invention is
It is characterized in that speed designation information indicating a data read speed is recorded on a recording medium such as a disk. Also, the second
The present invention is characterized in that the speed designation information is N (natural number) times the standard read speed. Furthermore, the third invention is
It is characterized in that N is 2. Furthermore, the fourth invention is characterized in that the data is real-time data. Furthermore, the fifth invention is characterized in that a synchronization signal for each frame is recorded in the data.

[0005]

According to the first aspect of the invention, the data for which the reading speed is set is recorded on the recording medium. According to the second aspect of the invention, the data whose read speed is set to the standard just multiplication is recorded on the recording medium. According to the third aspect of the invention, the data whose read speed is set to be exactly twice the standard reading speed is recorded on the recording medium. Further, according to the fourth invention,
Real-time data in which the read speed is set is recorded on the recording medium. Still further, according to the fifth invention, 1
A synchronization signal for each frame is recorded in the data.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic block diagram of an embodiment of the device of the present invention. Reference numeral 1 is an optical disk as a recording medium, 2 is a pickup as a reading means for optically reading data recorded on the optical disk 1, and 3 is a spindle motor as a driving means for rotating the optical disk 1.

Reference numeral 4 denotes a waveform shaping circuit for performing waveform shaping and digitization of a signal (data) read by the pickup 2, and reference numeral 5 denotes synchronization for detecting a synchronization signal for each frame from the signal output from the waveform shaping circuit 4. It is a detection signal. Reference numeral 6 is a data demodulation circuit that performs data demodulation of the signal from the waveform shaping circuit 4 using the detection signal from the synchronization detection circuit 5 as one reference, and reference numeral 7 is an error correction circuit that performs error correction on the demodulated data.

Reference numeral 8 denotes a system controller for controlling the entire apparatus, which separates the data input from the error correction circuit 7 from a data separation circuit 9 for separating management data described later from the separated management data and other data. A memory 10 for dividing and storing in a region of, and a control circuit 1 as a control means
1 is provided. The control circuit 11 is controlled by a controller that executes an application program (not shown), and performs access to the disk and rotation control of the spindle motor 3.

An access control circuit 12 outputs an address of data to be read in order to read the data recorded on the optical disk 1 instructed by the control circuit 11.
Is a servo circuit that moves the pickup 2 under the control of the access circuit 12 and performs focus adjustment and tracking control of the pickup 2. The servo circuit 13 uses a CLV (Constant Linear Velocity) so that the relative linear velocity between the pickup 2 and the optical disc 1 is integrated.
The pickup 2 is moved in the radial direction of the disc while controlling the locity).

Reference numeral 14 is a reference signal generating circuit which is controlled by the control circuit 11 and generates a signal of a frequency which is a reference of the rotational speed of the spindle motor 3, and 15 is a reference signal generating circuit 1.
4 is a comparison circuit that compares the signal from the synchronization signal from the synchronization detection circuit 5 and changes the rotation speed of the spindle motor 3 so that both signals match. Now, in the data recording area from the innermost circumference to the outermost circumference of the optical disc 1, as shown in FIG. 2, from the lead-in signal shown first in the recording area to the lead-out signal showing the end of the area,
Real-time data such as voice and image data is two files A and B (a group of data is called a file), non-real-time data consisting of code data is two files C and D, and these four files are managed. The management data file E for executing E, C,
It is recorded in the order of A, D, and B. The file E of the management data includes the file names of the four files, the addresses indicating the recorded areas (indicated by the time information on the disc), and the mode data indicating the file read speed (speed control data). , Is recorded for each file (see FIG. 3).

In the present embodiment, as shown in FIG. 3, as a mode indicating the file read speed, "1" indicating that it is real-time data that needs to be read at a specific read speed, and a specific read Indicates non-real-time data that does not need to be read at speed
There are 2 modes, "2", and mode "1".
In the case of, the linear velocity of 1.3 m / s is read, and in the case of mode "2", the linear velocity of 2.6 m / s, which is twice the mode "1", is read.

The modes are not limited to these two, and among the data that does not need to be read at a specific read speed, a plurality of types of data indicating the read speed are provided and the read speed is set according to the data. May be changed appropriately. In the initial state with the optical disc 1 mounted, the system controller 8 causes the reference signal generating circuit 14 to generate a signal of a specific frequency by the control circuit 11 in order to read data at a linear velocity of "1". The data of the file E of the management data is stored in the memory 10.

When the file A (or file B) of the real time data is read, the system controller 8 refers to the management data stored in the memory 10 and the read mode of the file A is "1". When the determination is made, the control circuit 11 causes the reference signal generation circuit 14 to generate a signal of the same specific frequency as described above so as to read in the mode "1".

Then, the data is read at the linear velocity of the mode "1", and after error correction by the error correction circuit 7, it is output from the system controller 8 to an output device (not shown) for real-time processing. Is output. Also,
When reading the data of the file C (or the file D) of the non-real-time data, the system controller 8 refers to the management data stored in the memory 10 and determines that the read mode of the file C is “2”. In order to perform the reading in the mode "2" by the control circuit 11, the reference signal generating circuit 14 generates a signal having a frequency twice the specific (standard) frequency.

Then, in the comparison circuit 15, since the synchronizing signal and the signal input from the reference signal generation circuit 14 are different, a signal is output so as to increase the rotational speed of the disk 1 in the spindle motor 3. Then, the state where the frequency of the synchronization signal obtained through the pickup 2, the waveform shaping circuit 4, and the synchronization detection circuit 5 and the frequency of the signal from the reference signal generation circuit 14 are kept the same is maintained, and the line of mode "2" is maintained. Data can be read stably at a speed.

The read data is subjected to error correction in the error correction circuit 7, and then the memory 10 of the system controller 8 is read.
Is stored in the memory or transferred to another device (not shown) for output. Thus, when data that requires real-time processing and data that does not require real-time processing are mixed in the same disk, each data can be read without being restricted by the read speed for real-time processing. The data is read at a speed that matches the data read speed.

Further, in this embodiment, the files recorded on the optical disk are not interleaved (distributed arrangement) in the recording area of the disk, but the areas of the lead-in signal, the lead-out signal and the management data are They may be interleaved within the excluded range. Further, the read speed mode for real-time data may be set in plural types according to the amount of data per unit time. That is, when reading real-time data with a large amount of data per unit time, the read speed is set fast according to the amount of data per unit time, and when reading real-time data with a small amount of data per unit time, The read speed may be set slower according to the amount of data per unit time.

In this embodiment, the case where the data is read from the optical disc on which the data is already recorded has been described. However, even when recording on the optical disc, the mode is recorded in the management data and the recording operation is performed at the speed of the mode. It is also possible to do Further, in the present embodiment, a plurality of files having different read speeds are recorded in one disk (recording medium). However, in the present invention, the disk having a single file recorded and the read speed of each file are common. It goes without saying that the disc to be included is included.

[0019]

According to the first aspect of the present invention, speed designation information (speed control data) indicating a data reading speed on a recording medium.
By recording, the data can be reproduced at the set read speed. Further, according to the second aspect of the invention, since the speed designation information is N (natural number) times the standard reading speed, the circuit of the reproducing device can be simplified as compared with the case of reproducing the data of the intermediate reading speed. Further, according to the third invention,
All that is required is to double the reproduction linear velocity. Further, according to the fourth invention, since the real-time data is recorded,
The quality of continuous information such as voice and images can be set and recorded. Furthermore, according to the fifth aspect, since the synchronization signal is fixed at one frame interval, the frequency of the reference signal may be switched at the time of reproduction according to the reading speed.

[Brief description of drawings]

FIG. 1 is a schematic circuit block diagram of a reproducing device for reproducing a recording medium of the present invention.

FIG. 2 is a diagram showing an example of a data structure recorded in a recording medium of the present invention.

FIG. 3 is a diagram showing a structure of a file of management data recorded on a disc of the present invention.

[Explanation of symbols]

 1 Optical Disc 2 Pickup 3 Spindle Motor 5 Synchronization Detection Circuit 8 System Controller 11 Control Circuit 15 Reference Signal Generation Circuit

Claims (5)

[Claims] 1. A recording medium in which speed designation information indicating a data reading speed is recorded. 2. The recording medium according to claim 1, wherein the speed designation information is N (natural number) times the standard read speed. 3. The recording medium according to claim 2, wherein the N is 2. 4. The recording medium according to claim 1, 2, or 3, wherein the data is real-time data. 5. The data is 1 regardless of the read speed.
2. A synchronization signal for each frame is included.
Alternatively, the recording medium according to claim 2 or claim 3 or claim 4.