JPH06150541A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To easily control additional information and TOC data on main data stored in an external memory area in a disk reproducing device successively reading out after the reproduced recording data are written and stored in a storage means temporarily. CONSTITUTION:An exclusive address generation means 8B generating an address in the storage means 9 based on the control data of a micro computer 11 is provided, and a second data area storing additional information on the main data is accessed directly. Thus, the control at every unit data is realized since it becomes possible that the additional information on the main data are read out as well simultaneously at the time of reproducing the main data.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Fields of Industrial Application Conventional Technology Problems to be Solved by the Invention (FIGS. 5 and 6) Means for Solving the Problems (FIGS. 1, 3 and 4) Action Embodiment (1) Overall Configuration of Embodiment (FIGS. 1 to 3) (1-1) Configuration of disk recording / reproducing device 1 (FIGS. 1 and 2) (1-2) Configuration of RAM control circuit 8 (FIG. 3) (2) Operation and effect of embodiment (3) Other Embodiments (FIG. 4) Effects of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus, and is suitable for application to, for example, a device for reproducing an audio signal recorded on a magneto-optical disc.

[0003]

2. Description of the Related Art Conventionally, a disk reproducing apparatus and a disk recording / reproducing apparatus capable of reproducing information from both a magneto-optical disk and a compact disk and recording desired information on the magneto-optical disk as many times as possible have been considered. There is.

By the way, when this disk recording / reproducing apparatus is used for reproducing an audio signal recorded on a magneto-optical disk or the like, it is considered that the disk recording / reproducing apparatus is often used outdoors or the like, which is susceptible to external vibrations, and therefore a large vibration is applied. Also, a technique for improving vibration resistance by using a semiconductor memory is being studied so that data reading is not interrupted and sound skipping does not occur.

This anti-vibration technology is compressed to about 1/5,
The audio data recorded after the error correction processing is read from the magneto-optical disk at a speed of 1.4 [Mbit / s], and the decoded audio data is once written in a random access memory (hereinafter referred to as RAM). Following this, the compressed audio data is stored in RAM
The vibration resistance is improved by continuously reading at a speed of 0.3 [Mbit / s] and expanding the original data length. At this time, the audio data is intermittently read from the magneto-optical disk.

In this way, by storing the audio data up to several seconds ahead of the audio data to be actually reproduced in the random access memory, even if it becomes impossible to take in the data due to a large vibration, the audio data will be reproduced again. By playing back the stored data until the reading is started, it is possible to prevent the occurrence of sound skip.

[0007]

By the way, in the magneto-optical disk used for reproducing the audio data, audio data divided into predetermined block units (hereinafter referred to as sound groups) are predetermined data units (hereinafter referred to as clusters). A data recording area for each recording and a lead-in area for storing table of contents information (TOC (Table Of Contents) data) other than music data, such as disk information and track information, are provided.

Of these, the data recording area is provided outside the recording area, and the lead-in area is provided inside the recording area. Writing and reading of data to and from this data recording area is performed by an integral multiple of one cluster.

Here, one cluster is composed of 36 sector data, and in the case of a magneto-optical disk for recording, the first 3 sectors are link sectors L as redundant sectors,
The next 1 sector is assigned to the sub data S, and the remaining 32 sectors are assigned to the compressed data (FIG. 5 (A)).

Incidentally, one sector consists of a sync area of 12 bytes from the beginning, a header area of 4 bytes, a sub-header area of 4 bytes, and a compressed data area of 2332 bytes, of which the cluster number, sector number, Mode area is 2 bytes, 1 byte,
They are allocated byte by byte (Fig. 6).

Of these, in one sector of the compressed data area, there are 5 sound groups consisting of two left and right channel data and left channel data or right channel data and 5 sound groups.
A set of sound groups is assigned (Fig. 5
(B) and FIG. 5 (C)).

In this type of disk recording / reproducing apparatus, compressed data of 512 samples, that is, 424 bytes of one sound group is handled as one unit (FIG. 5 (D)).

By the way, in this disk recording / reproducing apparatus,
Since it is necessary to manage the management data for each sector in addition to the TOC data such as the start address and end address of the data, the amount of management information is large, and the memory area in the micro computer (hereinafter referred to as MPU) is insufficient. R
It is considered to write in AM.

However, since the MPU cannot directly access the RAM which is an external memory area, it is difficult to manage the management data corresponding to the main data.
It was also impossible to edit OC data.

The present invention has been made in consideration of the above points, and reads additional information relating to main data and TOC data stored in the RAM which is an external memory area.
Alternatively, the present invention intends to propose a disk reproducing device in which writing can be directly performed by the MPU.

[0016]

In order to solve such a problem, in the present invention, the recording data read from the optical disk 3 in a predetermined unit is once written and stored in the storage means 9, and the stored recording data is sequentially stored. In a disk reproducing device that reproduces recorded data in a time series by reading out, a storage control unit 8 that controls writing and reading of the recording data to and from the storage unit 9, and a control unit 11 that controls an operation state of the storage control unit 8. And storage means 9
Is divided into a first data area for storing main data of the recording data and a second data area for storing additional information (header, sub-header) relating to the main data of the recording data, and the storage control means 8 is a control means. The address of the second data area is directly accessed by means of 11, and the additional information (header, subheader) stored in the second data area is read and written at any time.

Further, in the present invention, the storage control means 8
Is provided with a dedicated address generator 8B for generating the address of the storage means based on the external command transferred from the control means 11.

Further, in the present invention, the additional information (header, subheader) is index information including at least management information of the optical disk 3 and recording information (TOC, UTOC).

[0019]

The address of the second data area for storing the additional information (header, sub-header) related to the main data is directly accessed by the control means 11, and the additional information stored in the second data area is accessed at any time. By reading and writing, management of main data and editing of TOC data can be realized.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Overall Configuration of the Embodiment (1-1) Configuration of Disk Recording / Reproducing Device 1 In FIG. 1, reference numeral 1 denotes a disk recording / reproducing device as a whole, and a magneto-optical disk rotatably driven by a spindle motor 2. Irradiate a light beam from the optical pickup 4 to 3,
The reproduction signal, which is the received output of the reflected light, is amplified by the high frequency amplifier circuit 5.

The disk recording / reproducing apparatus 1 supplies the amplified reproduction signal to the servo control circuit 6 and the encoder / decoder 7. Here, the servo control circuit 6
Controls the rotation speed of the spindle motor 2 on the basis of this reproduction signal, and also controls the tracking and focus of the optical pickup 4.

The encoder / decoder 7 operates as an encoder in a recording mode for recording audio data as recording data on the magneto-optical disk 3, and a decoder in a reproducing mode for generating audio data recorded on the magneto-optical disk 3. To work as.

That is, the encoder / decoder 7 performs an encoding process (parity addition and interleaving process) for error correction of the audio data read from the RAM 9 via the RAM control circuit 8 in the recording mode, and an EFM.
Processing such as (8-14 modulation) processing is output to the magnetic head drive circuit 10, and audio data is recorded on the magneto-optical disk 3 by the magnetic field modulation method.

On the other hand, the encoder / decoder 7 performs processing such as decoding processing for error correction and EFM demodulation processing on the audio data input from the high frequency amplifier circuit 5 in the reproduction mode, and then, via the RAM control circuit 8. Write to RAM9.

When the audio data is input from the encoder / decoder 7 or the data compression / expansion circuit 12, the RAM control circuit 8 sequentially transfers the audio data to a predetermined address of the RAM 9 designated by the system controller 11 including the MPU. Further, the RAM control circuit 8 is the system controller 1
The audio data is read from a predetermined address of the RAM 9 designated by 1 and output to the data compression / expansion circuit 12 or the encoder / decoder 7.

The RAM control circuit 8 extracts the headers and sub-headers from the compressed audio data supplied to the data compression / decompression circuit 12 and gives them to the system controller 11, and the RAM by the system controller 10.
Performs various processing such as direct access to the header data of 9 and error correction in units of sound groups

In the case of this embodiment, the storage area of the RAM 9 is 1 [Mbit], and 44 sectors of main data, 6 or more sectors of TOC (Table Of Contents) data, and an error flag are separately stored. (Fig. 2).

The data compression / expansion circuit 12 has a capacity of 0.3 [Mbi
t / s] from audio compressed data read at 1.4
When the [Mbit / s] audio data is demodulated, it is converted to a digital / analog conversion circuit 13 (hereinafter referred to as D / A conversion circuit 1).
3) while supplying analog / digital conversion circuit 1
4 (hereinafter referred to as A / D conversion circuit 14) 1.4 [M
The bit / s] audio data is compressed to 0.3 [Mbit / s] and supplied to the RAM control circuit 8.

In the case of this embodiment, the system controller 11 controls the operation state of the entire disk recording / reproducing apparatus 1 and adds various control data to the header area and the sub-header area of each sector constituting the reproduction data. Has been done.

When the system controller 11 writes the compressed audio data in the RAM 9, the system controller 11 writes the track number in the mode area which is undefined when reading from the magneto-optical disk and the error information in the sector in the sub header area. And add the end position of audio data in units of sound groups and write (FIG. 6).

When the compressed audio data is read from the RAM 9, the time information and control information of each sector are stored in the RAM.
The reproduction time and the remaining time are read out from the control circuit 8 and displayed on the display 16 according to the instruction of the operation key 15, and the reproduction situation is managed.

(1-2) Configuration of RAM Control Circuit 8 In the case of this embodiment, the RAM control circuit 8 is constructed as shown in FIG. 3, and the compressed address data is designated by the system controller 11 at a predetermined address of the RAM 9. Between R
Input / output is performed via the AM interface 8A.

The RAM control circuit 8 can control the writing / reading of TOC data by the system controller 11 and the writing / reading of management data in units of each sector.

That is, the RAM control circuit 8 is connected to the system controller 11 via the microcomputer interface 8B.
And serial data is input / output between the two, and the counter value of the address generation circuit 8C is initialized based on the control data and the address designated by the system controller 11, and the address generated thereafter is set to the memory interface. It is designed to be given to 8A.

Incidentally, the counter constituting the address generation circuit 8B has a maximum count value of "3" which is incremented by 1 each time the RAM 9 is accessed unless an address is designated from the system controller 11.
FFFFF ”cyclic counter. This allows RAM
The control circuit 8 is a RAM by the system controller 11.
It is possible to directly write or read the data to and from the memory 9.

(2) Operations and Effects of the Embodiment Consider the case where the magneto-optical disk recording / reproducing apparatus 1 reads the stored data from the magneto-optical disk 3 in the above-mentioned configuration. Under the control of the system controller 11, the magneto-optical disk recording / reproducing apparatus 1 intermittently reads the reproduction data based on the remaining amount of data in the RAM 9.

At this time, the magneto-optical disk recording / reproducing apparatus 1
Reads the reproduced data at a transfer rate of 1.4 [Mbit / s], inputs it to the encoder / decoder 7, and performs decoding processing (parity deletion and deinterleave processing) for error correction and EFM (8-14). (Modulation) demodulation processing is executed.

Thereafter, the magneto-optical disk recording / reproducing apparatus 1 transfers this compressed audio data to the memory interface 8.
By writing to the RAM 9 via A, data several seconds ahead of the audio data currently being reproduced is accumulated.
At the same time, the magneto-optical disk recording / reproducing apparatus 1 sequentially reads out the stored compressed data and supplies it to the data compression / expansion circuit 12 to reproduce the data.

At this time, the system controller 11 wants to directly read the user TOC data and the error information contained in the sector to be currently reproduced, the management information as to what sound group the end of the music in the sector is. A read request command is sent to the microcomputer interface 8C, and a count value for setting the read address start value is given to the address generation circuit 8B.

Here, when the memory interface 8A permits access to the RAM 9, the RAM control circuit 8 gives the address generated in the address generation circuit 8B to the RAM 9 via the memory interface 8A, and the corresponding data. Is read out and transferred to the microcomputer interface 8C.

After that, the system controller 11 sends a read clock to the microcomputer interface 8C to sequentially take in this data internally. As a result, the system controller 11 can read the data necessary for processing the compressed data at an arbitrary timing.

When the order of the music data recorded on the magneto-optical disk is to be changed to change the reproduction order, the system controller 11 sends a write request command to the microcomputer interface 8C and a start address and an end of each music. Send the data that specifies the address and specify the address at that time.

The data writing is performed by the memory interface 8A writing the data to the address designated by the address generating circuit 8B when the access permission from the memory interface 8A is obtained.

According to the above configuration, a dedicated counter for generating an address when the system controller 11 directly accesses the RAM 9, that is, the address generation circuit 8B.
By setting this count value by the system controller 11, the magnetic disk recording / reproducing apparatus 1 can directly manage the time relating to the data actually read from the RAM 9 and read / write the TOC information at any time. can do.

(3) Other Embodiments In the above-described embodiment, the memory-dedicated address generation circuit 8B is provided in the RAM control circuit 8, and various data is exchanged with the system controller 9 using serial data. However, the present invention is not limited to this, and the data may be read directly via the bus controller 20 as shown in FIG. However, in this case, the number of pins of the MPU forming the system controller 11 increases, and an expensive MPU is required.

In the above embodiment, the maximum count value of the counter constituting the address generation circuit 8B is "3".
The case of the configuration using the cyclic counter of "FFFFF" has been described, but the present invention is not limited to this, and the maximum count value of the counter can be set to various values according to the data format, the storage capacity, and the like.

Further, in the above embodiment, the case where the magneto-optical disk is used as the recording medium has been described.
The present invention is not limited to this, and can be widely applied to optical disks.

[0049]

As described above, according to the present invention, the address of the second data area for storing the additional information regarding the main data is directly accessed by the microcomputer, and the additional data stored in the second data area is accessed. By reading / writing information at an arbitrary time, it becomes possible for the microcomputer to manage main data and edit TOC data. As a result, even if there is a large amount of management information regarding the data being reproduced, direct management using a micro computer can be made possible.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram showing a memory map of data recorded in a random access memory.

FIG. 3 is a block diagram showing a configuration of a random access memory control circuit.

FIG. 4 is a block diagram for explaining another embodiment.

FIG. 5 is a schematic diagram showing a data structure of a cluster.

FIG. 6 is a schematic diagram showing a data structure of a sector.

[Explanation of symbols]

1 ... Disk recording / reproducing device, 2 ... Spindle motor, 3 ... Magneto-optical disk, 4 ... Optical pick-up, 7
... Encoder / decoder, 8 ... Random access memory control circuit, 9 ... Random access memory, 10 ...
... magnetic head drive device, 11 ... system controller, 12 ... data compression / expansion circuit.

Claims (3)

[Claims] 1. A disc reproducing apparatus for reproducing the record data continuously in a time series by writing the record data read out from the optical disk in a predetermined unit into a storage means, accumulating the same, and sequentially reading the accumulated record data. A storage control unit that controls writing and reading of the recording data to and from the storage unit, and a control unit that controls an operation state of the storage control unit, wherein the storage unit stores main data of the recording data. It is divided into a first data area to be stored and a second data area to store additional information relating to the main data of the recording data, and the control means directly accesses the address of the second data area, The disk re-reading characterized by reading and writing the above-mentioned additional information stored in the second data area at an arbitrary time point. Raw equipment. 2. The storage control means according to claim 1, further comprising a dedicated address generator for generating an address of the storage means based on an external command transferred from the control means. Disk playback device. 3. The disk reproducing apparatus according to claim 1, wherein the additional information is index information including at least management information and recording information of the optical disk.