JPH07312038A - Disk device and reproducing method therefor, method for measuring error of reproduced information and measuring method therefor - Google Patents

Abstract

PURPOSE:To efficiently reproduce information by detecting and correcting an error for only required information without performing it for unnecessary information based on a write-in control signal which stores information in a memory. CONSTITUTION:A motor 5 carries a pickup 4 in the direction of a radius of an optical disk 1. A reading signal is amplified, arranged in a waveform, and binarized by a RF circuit 6, and focusing and tracking error signals are obtained. A signal processing circuit 7 includes an EMF demodulation circuit, a EMF decoder 71 being an error correcting means, a memory 72, a memory control circuit 73, a circuit 74 which performs sound extension and D/A conversion, and connects a signal line of a write-in control signal WR to the EMF decoder 71. When data is reproduced, it is judged whether the signal WR is active or not, if it is active, measuring reproduced data is started. It is judged whether measuring is finished or not, if it is finished, an error measuring flow is finished. Thus, since the detection and correction of the error for unnecessary information is not performed, but the detection and correction of the error for only information required to store in a memory is performed, efficient information reproduction can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk apparatus for playing an optical disk on which information such as music is recorded and reproducing the information, a reproducing method therefor, and an error measuring apparatus for measuring information error in the disk apparatus. And the measuring method thereof.

[0002]

2. Description of the Related Art In recent years, a disc device for playing a mini disc (hereinafter referred to as MD) capable of recording and reproducing has become widespread. In such a disc device, information such as music information is compressed to about 1/5 and recorded in an MD, and at the time of reproduction, the data of the compressed reproduction signal read from the MD by the pickup, that is, the compression information is written in the memory. , About 5 for compressed information read from memory
Double expansion processing is performed, and predetermined processing such as A / D conversion is performed. Audio compression technology, AT
It is called RAC (Adaptive TRansform Acoustic Coding). In such a system, the writing rate to the memory is about 1/5 of the reading rate.

By recording the compressed information on the MD, the equivalent recording density can be increased five times, and when an error occurs in the compressed information read from the MD due to a disturbance such as vibration, an error occurs. By re-reading the record information related to the compressed information, the error correction can be substantially performed.

[0004]

However, in the above-mentioned conventional disk device, error detection and error detection are performed for unnecessary information even when the pickup is jumping during special reproduction such as search operation or scan operation. Since the correction is performed, there is a problem that it takes a long time to detect and correct the error.

Further, an error measuring device for measuring an error of information read from a disk in the disk device has the same problem.

The present invention solves the above-mentioned conventional problems, and a disk apparatus which does not perform error correction on unnecessary information, a reproducing method thereof, and an error measuring apparatus for measuring an information error in the disk apparatus. And its measuring method.

[0007]

In order to achieve the above object, the invention according to claim 1 irradiates a light beam onto a disk having information recorded on spiral or concentric tracks, and A pickup that reads information, an RF amplifier that extracts the information from a read signal obtained from the pickup, an error correction unit that corrects an error in the information, a memory that stores the information, and the information is written in the memory. A disk device comprising a memory control means for issuing a write control signal, wherein the error correction means performs error correction on the information when receiving the write control signal.

According to a second aspect of the present invention, there is provided an information reproducing method for reproducing the information from a disc in which information is recorded on spiral or concentric tracks, which is given to the memory when the information is written in the memory. An error correction process of the information is performed when a write control signal is issued.

According to a third aspect of the present invention, there is provided an error measuring device for measuring an error of the read information in a disk device for reading the information recorded on the disc, storing the information in the memory, and reproducing the stored information. The memory control means of the disk device measures information error when receiving a write control signal issued when the information is stored in the memory.

According to a fourth aspect of the present invention, there is provided an error measuring method for reading an information recorded on a disc, storing the information in a memory, and measuring an error of the read information in a disc device for reproducing the stored information. The memory control means of the disk device measures information error when receiving a write control signal issued when the information is stored in the memory.

[0011]

According to the present invention, therefore, error detection and correction are not performed on unnecessary information, and error detection and correction are performed on only necessary information stored in the memory, so that efficient information reproduction is possible. It will be possible.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a disk device of the present invention. In FIG. 1, 1 is an optical disc on which information such as music is recorded, and 2 is this optical disc 1.
A spindle motor 3 for rotating and driving the objective lens is an objective lens that converges a light beam emitted from a light source (not shown) and focuses it on a track of an optical disc. By changing the attitude of the objective lens, It includes an objective lens actuator that performs focus servo and tracking servo. Reference numeral 4 denotes a pickup that supports the objective lens 3, and includes a light source that generates a light beam and a photoelectric conversion element that receives the light beam reflected by the optical disk and converts it into an electric signal.

A pickup driving motor 5 moves the pickup 4 in the radial direction of the optical disk 1, and constitutes a traverse mechanism as a conveying means together with a position detector and other mechanical parts. An RF circuit 6 amplifies a read signal obtained from the pickup 4 and performs waveform shaping to binarize the read signal, and outputs a focus error signal and a tracking error signal. 7 inputs the read signal obtained from the RF circuit, detects the edge, CL
The signal processing circuit performs various signal processings such as V control signal extraction, EFM demodulation, and error correction.

Reference numeral 8 is a CPU as a control means for controlling the entire apparatus, and reference numeral 9 is a servo control circuit for controlling the spindle motor 2 and the pickup drive motor 5 by a control signal from the CPU 8.

The internal structure of the signal processing circuit 7 is EF.
EFM decoder 71 which is an error correction means for performing M demodulation and error correction, a storage memory 72 for storing information, a memory control circuit 73 for writing and reading information to and from the storage memory 72, and information read from the storage memory 72. The audio decompression circuit for decompressing the band and the D / A conversion circuit 74 for converting a digital signal into an analog signal. The feature of the present embodiment is that the signal line of the write control signal WR connected from the memory control circuit 73 to the storage memory 72 is also connected to the EFM decoder 71.

FIG. 2 is a block diagram showing the system configuration of an error measuring apparatus according to another embodiment. 2, the same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 10 is an error measuring device for measuring an error in information included in the read signal obtained from the RF circuit 6. A signal line for the write control signal WR from the memory control circuit 73 is connected to the error measuring device 10. Furthermore, CPU8
Is connected to a signal line of a status signal ST for notifying the operating state of this disk device.

FIG. 3 is a flow chart showing the error measuring method of the error measuring apparatus of FIG. 2, but the flow chart showing the operation of the reproducing method of the disk apparatus of FIG. 1 is almost the same, so the flow chart of FIG. I will also explain that. In FIG. 3, it is determined whether or not the data is being reproduced (step S1), and if the data is being reproduced, it is determined whether or not writing to the storage memory 72 is started, that is, whether or not the write control signal WR is active (step S2). ), If the write control signal WR is active, measurement of reproduction data is started (step S3). Then, it is determined whether or not the measurement is completed (step S), and when the measurement is completed, this flow is ended.

[0019]

As is apparent from the above embodiment, the present invention is based on the write control signal for storing information in the memory.
Since error detection or correction is not performed on unnecessary information and error detection or correction is performed only on necessary information stored in the memory, efficient information reproduction is possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a disk device of the present invention.

FIG. 2 is a block diagram showing a system configuration of an error measuring device of the present invention.

FIG. 3 is a flowchart showing an error measuring method of the error measuring device of FIG.

[Explanation of symbols]

 1 Optical Disc 2 Spindle Motor 3 Objective Lens / Objective Lens Actuator 4 Pickup 5 Pickup Drive Motor 6 RF Circuit 7 Signal Processing Circuit 8 CPU 9 Servo Control Circuit 71 EFM Decoder 72 Storage Memory 73 Memory Control Circuit 74 Voice Expansion Circuit / D / A Conversion Circuit WR Write control signal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 20/18 F 8940-5D 7/00 Y 9464-5D

Claims (4)

[Claims] 1. A pickup for irradiating a disc on which information is recorded on a spiral or concentric track with a light beam to read the information, and an RF amplifier for extracting the information from a read signal obtained from the pickup.
A disk device comprising: an error correction unit that corrects an error in the information; a memory that stores the information; and a memory control unit that issues a write control signal that writes the information in the memory. Is a disk device which performs error correction of the information when receiving the write control signal. 2. An information reproducing method for reproducing the information from a disk in which information is recorded on spiral or concentric circular tracks, wherein a write control signal given to the memory is issued when the information is written to the memory. An information reproducing method, characterized in that an error correction process is performed on the information when received. 3. An error measuring device for reading information recorded on a disc, storing the information in a memory, and measuring an error of the read information in a disc device for reproducing the stored information, the memory of the disc device. An error measuring device characterized in that the control means measures an error in information when receiving a write control signal issued when the information is stored in the memory. 4. An error measuring method for reading information recorded on a disc, storing the information in a memory, and measuring an error of the read information in a disc device for reproducing the stored information, the memory of the disc device. An error measuring method characterized in that an error in information is measured when a control means receives a write control signal issued when the information is stored in the memory.