JPH0896515A - Optical disk reproduction system - Google Patents

Abstract

PURPOSE: To obtain an optical disk reproduction system capable of easily reproducing information on an optical disk of a different recording format. CONSTITUTION: The information recorded in the optical disk 34 which is driven by a disk motor 35 and a disk motor 36 in an optical disk drive 31 to rotate, is read out by a pickup 37 controlled by a pickup control circuit 38 to be sent to a preamplifier circuit 40. After the signal of the information is amplified by the preamplifier circuit 40, it is sent to a waveform shaping circuit 41 to be converted into a pulse signal. This pulse signal is sent from the waveform shaping circuit 41 to an interface part 32 constituted of a PLL circuit 42 and a discriminator 43. The PLL circuit 42 extracts a synchronizing signal in the pulse signal, and the discriminator 43 detects the presence of the pulse signal in a fixed time zone based on the synchronizing signal and the pulse signal is sent to a personal computer 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing system which uses an optical disc drive and a host device to utilize data read from an optical disc.

[0002]

2. Description of the Related Art An optical disk reproducing system constructed by combining an optical disk drive and a higher-level device such as a personal computer is capable of storing a large amount of data and is used in general companies, the National Police Agency and other wide fields.

In the general optical disc reproducing system shown in FIG. 10, the optical disc drive 1 is provided with an interface 2,
It is configured to be connected to the personal computer 4 via 3. An interface 2 is built in the optical disc drive 1, and the data read from the optical disc drive 1 passes through the interfaces 2 and 3 and is sent to the personal computer 4 for use.

Since the optical disk drive 1 reproduces the information stored in the optical disk 11 as shown in FIG. 11, the disk motor 12, the disk motor servo circuit 13, the pickup 14 and the pickup control circuit 1 are provided.
5, preamplifier circuit 16, waveform shaping circuit 17, PLL circuit 18, discriminator 19, decoder 20, error correction circuit 21,
It is composed of a system control circuit 22 and an interface 2.

The information stored in the optical disk 11 which is rotationally driven by the disk motor 12 and the disk motor servo circuit 13 is read by the pickup 14 and converted into an electric signal, which is sent to the preamplifier circuit 16. The electric signal is amplified by the preamplifier 16, sent to the waveform shaping circuit 17, converted into a pulse signal, and then sent to the PLL circuit 18. This PL
The L circuit 18 synchronizes with the pulse signal and detects the presence or absence of the pulse signal in the time zone determined by the discriminator 19. The pulse signal detected by the discriminator 19 is demodulated into a data bit tone by the decoder 20. The demodulated signal is sent to the error correction circuit 21 for error correction, and then the interface 2
Then, it is output to the outside of the optical disc drive 1 and sent to the personal computer 4 via the interface 3 as shown in FIG.

[0006]

In the above-mentioned conventional optical disc reproducing system, since the optical disc drive 1 has the decoder 20 and the error correction circuit 21 built therein,
The configuration of the optical disk drive 1 is complicated.
The decoder 20 and the error correction circuit 21 are configured by hardware such as an IC, that is, an electronic circuit, and the optical disc 11 is processed by a different modulation system such as a 1-7 modulation system or a 2-7 modulation system. When the information is recorded, the hardware needs to be changed in order to reproduce the information. This change is extremely difficult, so
In some cases, the optical disc drive 1 itself must be replaced. As a result, there is a problem that the information on the optical disks 11 recorded by different modulation methods, that is, the information on the optical disks 11 of different recording formats cannot be easily reproduced by the same optical disk drive 1.

The present invention has been made in view of the above circumstances, and provides an optical disk reproducing system in which the structure of the optical disk drive 1 is simplified and information in optical disks of different recording formats can be easily reproduced by the same optical disk drive. The purpose is to

[0008]

SUMMARY OF THE INVENTION A first invention is a pickup for irradiating an optical disc with laser light, detecting return light and converting it into an electric signal, and a preamplifier circuit for amplifying an output signal from the pickup. An optical disc drive that reads out the information recorded on the optical disc and a waveform shaping circuit that converts the output signal of the preamplifier circuit into a pulse signal, and performs synchronization processing on the pulse signal output from the waveform shaping circuit. It comprises a PLL circuit and a discriminator for detecting the pulse signal synchronized by the PLL circuit in a predetermined time zone, and of the information read from the optical disc drive based on the detection result by the discriminator. An interface section for reproducing the signal and a signal of the above information reproduced by this interface section And Shin, characterized by comprising a host device which performs decoding and error correction processing.

According to a second aspect of the invention, a pickup which irradiates an optical disk with laser light, detects return light and converts it into an electric signal, a preamplifier circuit which amplifies an output signal from the pickup, and an output signal of the preamplifier circuit. To a pulse signal, an optical disc drive for reading information recorded on the optical disc, a PLL circuit for synchronizing the pulse signal output from the waveform shaping circuit, and the PLL. Discriminator for detecting the pulse signal synchronized by the circuit in a predetermined time period, and serial / parallel conversion circuit for performing serial / parallel conversion on the regenerated pulse signal output from the discriminator And an interface unit for reproducing the information signal read from the optical disk drive. Receives a signal of the information reproduced by the interface unit, characterized by comprising a host device which performs decoding and error correction processing.

A third invention is a pickup for irradiating an optical disk with laser light, detecting return light and converting it into an electric signal, a preamplifier circuit for amplifying an output signal from the pickup, and an output signal of the preamplifier circuit. To a pulse signal, an optical disc drive for reading information recorded on the optical disc, a PLL circuit for synchronizing the pulse signal output from the waveform shaping circuit, and the PLL. From a discriminator that detects the pulse signal synchronized by the circuit in a predetermined time period, and a microcomputer that performs decoding and error correction processing on the regenerated pulse signal output from the discriminator. An interface for reproducing the information signal read by the optical disk drive. And parts, decoded by the interface unit receives and processes the signal of the information subjected to error correction processing, characterized by comprising a host device for performing control of the microcomputer.

[0011]

[Action]

(First Invention) In a state where an optical disc is rotationally driven in an optical disc drive, laser light emitted from the pickup is reflected on the optical disc and returns to the pickup again. The pickup converts the intensity change of the returned laser light into an electric signal and sends it to the preamplifier circuit. The electric signal is amplified in the preamplifier circuit and then sent to the waveform shaping circuit to be converted into a pulse signal. This pulse signal passes through the PLL circuit and the discriminator in the interface section and is input to the host device as a pulse signal subjected to synchronization processing. Decoding and error correction processing are performed on the pulse signal subjected to the synchronization processing in this host device.

As described above, by performing the decoding process and the error correction process inside the host device, it is possible to easily cope with a wide variety of decoding and error correction. Therefore, for example, information is recorded by different modulation methods. The same optical disk drive can be used to reproduce the optical disk.

(Second Invention) In a state where the optical disc is rotationally driven in the optical disc drive, the information recorded on the optical disc is detected by the pickup and converted into an electric signal. This electric signal passes through a preamplifier circuit and a waveform shaping circuit, is converted into a pulse signal, and is output from the optical disk drive to the interface section. The pulse signal passes through the PLL circuit and the discriminator in the interface section, and is input to the serial / parallel conversion circuit as a pulse signal subjected to synchronization processing. In this serial / parallel conversion circuit, the pulse signal is serial / parallel converted and sent to the host device. The host device performs decoding and error correction processing on the pulse signal subjected to the synchronization processing.

As described above, by performing the decoding process and the error correction process inside the host device, it is possible to easily cope with a wide variety of decoding and error correction. Therefore, for example, information is recorded by different modulation methods. The same optical disk drive can be used to reproduce the optical disk. Further, since the serial / parallel conversion circuit transfers information in parallel format to the higher-level device, high-speed transfer of information between the interface unit and the higher-level device becomes possible.

(Third invention) In a state where the optical disc is driven to rotate, the information recorded on the optical disc is detected by the pickup and converted into an electric signal. This electric signal passes through a preamplifier circuit and a waveform shaping circuit, is converted into a pulse signal, and is output from the optical disk drive to the interface section.

On the other hand, the microcomputer is controlled by the host device and is in a state capable of executing decoding and error correction processing. In this state, the pulse signal input to the interface section passes through the PLL circuit and the discriminator and is input to the microcomputer as a pulse signal subjected to synchronization processing. This microcomputer performs decoding and error correction processing on the pulse signal that has been subjected to the synchronization processing, and sends the processing result to the host device.

As described above, since the decoding process and the error correction process are performed by the microcomputer controlled by the host device, it is possible to easily cope with a wide variety of decoding and error correction. The same optical disc drive can be used to reproduce an optical disc on which is recorded. Further, since the information is transferred between the microcomputer and the host device, the information can be transferred at high speed between the interface unit and the host device.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram of an optical disk reproducing system according to a first embodiment of the present invention.

As shown in the figure, in the optical disc reproducing system, the optical disc drive 31 is provided with the interface unit 3.
Personal computer 33, which is a higher-level device via
The information is read from the optical disc 34 on which the information is recorded and reproduction processing is performed.

In the optical disc drive 31, the optical disc 34 is mounted on a disc motor 35 and is rotationally driven. Pits are previously formed as information data on the reflection surface of the optical disc 34. The number of revolutions of the disc motor 35 is controlled by a control signal output from the disc motor servo circuit 36. The information recorded on the optical disk 34 is the pickup 37.
Read by. The pickup 37 irradiates the reflecting surface of the optical disc 34 with laser light and receives the return light from the reflecting surface. The pickup 37 is
It is controlled by a signal output from the pickup control circuit 38. That is, although not shown, the pickup control circuit 38 is an LD control circuit that controls the light amount adjustment of the laser diode in the pickup 37, and the optical disc 3.
4 is composed of a focus servo circuit for adjusting the focus of the laser beam on the reflecting surface of No. 4 and a tracking servo circuit for correcting and adjusting the track deviation generated in the optical disc 34, and the above control is performed by the pickup control circuit 38 to the pickup 37. Is done to. In addition,
The disc motor servo circuit 36 and the pickup control circuit 38 are controlled by signals from the system control circuit 39.

The pickup 37 also converts the intensity change of the received return light into an electric signal and sends it to the preamplifier circuit 40. The preamplifier circuit 40 amplifies the electric signal and sends it to the waveform shaping circuit 41. The waveform shaping circuit 41 converts the amplified electric signal into pulse signals of “1” and “0” and sends the pulse signal to the interface unit 32. The optical disc drive 31 includes a disc motor 35, a disc motor servo circuit 36, a pickup 37, a pickup control circuit 38, a system control circuit 39, a preamplifier circuit 40, and a waveform shaping circuit 41.

The interface section 32 includes a PLL circuit 42.
And a discriminator 43. The waveform shaping circuit 41
The pulse signal sent out from is input to the PLL circuit 42 of the interface unit 32. This PLL circuit 42 is
A synchronization signal is extracted by performing phase adjustment on the pulse signal to perform synchronization processing. As a result, the phase-adjusted pulse signal is output from the PLL circuit 42 to the discriminator 43 together with the synchronization signal, and it is detected whether or not the phase-adjusted pulse signal is present within a predetermined time period. . The signal detected by the discriminator 43 is sent to the personal computer 33.

The personal computer 33 performs a decoding process of demodulating the detection code string in the phase-adjusted pulse signal into a data bit string, and further performs an error correction process on the demodulated data. This error correction process is a process for correcting data errors caused by defects such as small dust and scratches on the optical disc 34. The personal computer 33 uses the data corrected by the error correction processing as read data from the optical disc 34.

FIG. 2 is a diagram showing the configuration of the personal computer 33 in FIG. 1 and further explaining the connection with the interface section 32. As shown in the figure, a CPU 52, an I / O port 51, which is a signal input / output port,
Memory 53, storage device 54, keyboard 55, CRT 5
6 are connected to form a personal computer 33. Further, the discriminator 43 is connected to the I / O port 51 to realize the connection between the interface unit 32 and the personal computer 33. The CPU 52 controls the operation of the decoding process and the error correction process with respect to the reproduction signal from the optical disc 34 input into the personal computer 33 from the discriminator 43 via the I / O port 51. Further, the storage device 54 stores the procedure of the decoding process and the error correction process. That is, the procedure of the decoding process and the error correction process stored in the storage device 54 by the CPU 52 is loaded into the memory 53, and the data input into the personal computer 33 is also stored in the memory 53. In this memory 53, decoding and error correction processing are performed according to the above procedure. In addition,
The keyboard 55 is used when inputting a processing command or the like to the personal computer 33, and the CRT 56
Displays the data reproduced from the optical disc 34.

Next, the operation of the above embodiment will be described.
While the optical disc 34 shown in FIG. 1 is being rotationally driven by the disc motor 35 and the disc motor servo circuit 36, the pickup 37 moves to the optical disc 34.
Irradiate laser light to the. This laser light is reflected on the reflection surface of the optical disc 34 and returns to the pickup 37 again. At this time, the intensity of the laser light is determined by the optical disc 34.
It changes depending on the pits formed on the reflective surface of. The pickup 37 detects a change in the intensity of the laser light,
It is converted into an electric signal and sent to the preamplifier circuit 40. Next, the preamplifier circuit 40 amplifies the electric signal and sends it to the waveform shaping circuit 41. The waveform shaping circuit 41 detects the presence or absence of the amplified electric signal, that is, "1", "0".
To a PLL circuit 42 in the interface section 32 which is provided separately from the optical disc drive 31 or detachably.

During the above-mentioned information read operation,
When it becomes necessary to change the rotation speed of the optical disc 34, or when the laser beam defocuses or tracks on the optical disc 34 occur, the disc motor servo circuit 36 and the pickup control circuit 38 cause the disc motor to rotate. A correction process and the like for 35 and the pickup 37 are performed.

The PLL circuit 42 adjusts the phase of the input pulse signal and extracts a synchronization signal. Next, the phase-adjusted pulse signal (hereinafter referred to as the pulse signal) is output from the PLL circuit 42 to the discriminator 43 together with the synchronization signal. Next, the discriminator 43
Detects the presence or absence of the pulse signal within a certain defined time zone (detection window), and the personal computer 3
Send to 3. The personal computer 33 selects a method of data decoding processing and error correction processing based on the input pulse signal, and based on the selection result, a signal for demodulating the pulse signal into a data bit string and small dust and dirt. Error correction processing is performed to correct an error caused by a defect such as a scratch.

The implementation of the decoding process and the error correction process will be described in more detail with reference to FIGS. 2 and 3. In order to shift the procedure of the decoding and error correction processing stored in the storage device 54 to the memory 53 in the state before the pulse signal data is input to the personal computer 33 shown in FIG. By CP
Input a command to U52. The CPU 52, which has received the command from the keyboard 55, reads out the procedure of the decoding and error correction processing from the storage device 54 and stores it in the memory 53.

Next, the operation of decoding and error correction processing is shown in FIG. The CPU 52 outputs the I / O signal from the discriminator 43.
The data of the pulse signal input into the personal computer 33 via the O port 51 is stored in the memory 53 (step A1). When the above data is loaded into the memory 53, the CPU 52 selects one of a plurality of decoding processing procedures stored in the memory 53 in advance, based on the loaded data. Next, the CPU 52 performs the decoding process on the data of the pulse signal based on the selected decoding process procedure (step A2). When this process is completed, the CPU 52 then performs an error correction process on the decoded data based on the error correction procedure stored in the memory 53 (step A3). When this process is completed, the CPU 52 uses the error-corrected data as read data from the optical disc 34 on the personal computer 33, that is, performs data processing (step A4). When step A4 ends, the CPU 52 confirms whether or not to end the above operation (step A5), and if data still needs to be fetched from the interface unit 32, returns to step A1 and executes the above process. repeat. In addition, CR
T56 displays the processing result and the like. If it is not necessary to take in the data, the operation of the personal computer 33 is ended.

As described above, the PLL circuit, the discriminator, the decoder, and the error correction circuit provided in the conventional optical disk drive are as shown in FIG.
By disposing the discriminator 43 and the discriminator 43 as the interface unit 32 outside the optical disc drive 31, and by substituting the functions of the decoder and the error correction circuit by the personal computer 33, the configuration of the optical disc drive 31 can be simplified. become. In addition, the personal computer 3
By assigning the functions of the decoder and the error correction circuit to the internal storage device 54 and executing the decoding and the error correction processing as the processing of the CPU 52, the decoder and the error correction circuit can be implemented by hardware such as an electronic circuit. It is not necessary to configure the configuration, and various decoding processes and error correction processes can be easily handled by only changing the data in the storage device 54. Therefore, when information is written on the optical disc 34 by different modulation methods, the same optical disc drive 31 can easily perform reproduction processing on the optical discs 34 having different recording formats without changing the hardware. Can be done.

(Second Embodiment) FIG. 4 is a block diagram of an optical disk reproducing system according to a second embodiment of the present invention.

As shown in the figure, the interface section 61 in the optical disk reproducing system of the second embodiment is
The PL in the interface unit 32 of the first embodiment shown in FIG.
In addition to the L circuit 42 and the discriminator 43, a serial / parallel conversion circuit 62 is added. That is, the serial / parallel conversion circuit 62 is inserted between the discriminator 43 and the personal computer 33.
The pulse signal data sent from the device is serial / parallel converted to parallel form and sent to the personal computer 33. Other configurations are the same as those in the first embodiment.

Further, in FIG. 5, the personal computer 3
3 shows the configuration and the connection with the interface unit 61.
The configuration of the personal computer 33 is the same as that of the first embodiment, and the I / O port 51 has an interface section 61.
Serial / parallel conversion circuit 62 is connected.

Next, the operation of the above embodiment will be described.
In a state where the optical disc 34 shown in FIG. 4 is rotationally driven by the disc motor 35 and the disc motor servo circuit 36, by the same procedure as in the first embodiment,
The signal read from the optical disc 34 by the pickup 37 is applied to the waveform shaping circuit 41 of the optical disc drive 31.
Is sent as a pulse signal to the PLL circuit 42 of the interface section 61 for phase adjustment, passes through the discriminator 43, and is then sent to the serial / parallel conversion circuit 62. The serial / parallel conversion circuit 62 converts the input serial data of the phase-adjusted pulse signal into parallel data, and sends the parallel data to the personal computer 33 outside the interface 61.

At this time, in the personal computer 33 shown in FIG. 5, the decoding and error correction processing procedures are already stored in the memory 53 as in the first embodiment. The parallel data input to the I / O port 51 is processed by the processing procedure shown in FIG.

The CPU 52 stores in the memory 53 the parallel data output from the serial / parallel conversion circuit 62 and input into the personal computer 33 via the I / O port 51 (step B1). When the data is fetched into the memory 53, the CPU 52 performs the decoding process on the parallel data, that is, the phase-adjusted pulse signal based on the procedure of the decoding process stored in the memory 53 in advance (step). B2). When this process ends, the CPU 52 next performs an error correction process on the decoded data based on the error correction procedure stored in the memory 53 (step B).
3). When this process ends, the CPU 52 uses the error-corrected data as read data from the optical disc 34 on the personal computer 33.
That is, data processing is performed (step B4). Step B
When step 4 is completed, the CPU 52 confirms whether or not to end the above operation (step B5), and if data still needs to be fetched from the interface section 61, the process returns to step B1 and repeats the above processing. . The CRT 56 displays the processing result and the like. If it is not necessary to take in the data, the operation of the personal computer 33 is ended.

As described above, the PLL circuit, the discriminator, the decoder, and the error correction circuit provided in the conventional optical disk drive are as shown in FIG.
By disposing the discriminator 43 and the discriminator 43 as an interface unit 61 outside the optical disc drive 31, and by substituting the functions of the decoder and the error correction circuit by the personal computer 33, the configuration of the optical disc drive 31 can be simplified. become. In addition, in the interface unit 61,
Since the parallel data is sent to the I / O port 51 by adding the serial / parallel conversion circuit 62,
Interface unit 61 and personal computer 33
Enables high speed data transfer between.

Further, by assigning the functions of the decoder and the error correction circuit to the storage device 54 inside the personal computer 33 and executing the decoding and the error correction processing as the processing of the CPU 52, the decoder and the error correction circuit can be realized. It is not necessary to configure by hardware such as an electronic circuit, and various decoding processes and error correction processes can be easily handled only by changing the data in the storage device 54. Therefore, when information is written on the optical disc 34 by different modulation methods, the same optical disc drive 31 can easily perform reproduction processing on the optical discs 34 having different recording formats without changing the hardware. Can be done.

(Third Embodiment) FIG. 7 is a block diagram of an optical disk reproducing system according to a third embodiment of the present invention.

As shown in the figure, the interface section 71 of the optical disk reproducing system of the third embodiment uses a microcomputer 72 in place of the serial / parallel conversion circuit 62 of the second embodiment shown in FIG. Has become. That is, in the third embodiment, the microcomputer 7 controlled by the personal computer 33.
The reference numeral 2 is for performing decoding and error correction processing.

As shown in FIG. 7, the microcomputer 72 is inserted between the discriminator 43 and the personal computer 33. The microcomputer 72 receives a control signal (control software) sent from the personal computer 33, performs decoding and error correction processing on the phase-adjusted pulse signal output from the discriminator 43, and outputs the processed data. Is sent to the personal computer 33.

Further, FIG. 8 shows a personal computer 3
3 shows the configuration and the connection with the interface unit 71,
The configuration of the personal computer 33 is the same as in the first and second embodiments. Discriminator 43 of interface unit 71
The data of the phase adjusted pulse signal output from
The data is taken into the memory 82 through the I / O port 81 in the microcomputer 72. In addition, the memory 82 is
It is connected to the CPU 83. This CPU 83
It is connected to the CPU 52 through the O port 84 and the I / O port 51 of the personal computer 33. The procedure of the decoding process and the error correction process sent from the personal computer 33 via the I / O port 84 is stored in the memory 82 via the CPU 83, and the CP is executed based on the above procedure.
The U 83 performs decoding and error correction processing on the phase-adjusted pulse signal data stored in the memory 82. The microcomputer 72 includes an I / O port 81, a memory 82, a CPU 83, and an I / O port 84.

Next, the operation of the above embodiment will be described.
A signal read from the optical disc 34 by the pickup 37 by the same procedure as in the first and second embodiments while the optical disc 34 shown in FIG. 7 is being rotationally driven by the disc motor 35 and the disc motor servo circuit 36. Is a pulse signal from the waveform shaping circuit 41 of the optical disk drive 31 and P of the interface unit 71.
It is sent to the LL circuit 42.

On the other hand, by the operation of the CPU 52 in the personal computer 33 shown in FIG. 8, the procedure of the decoding and error correction processing stored in the storage device 54 is preloaded in the memory 82 of the microcomputer 72. This operation and the processing for the data input to the microcomputer 72 are shown in FIG. It should be noted that FIG. 10A shows the operation of the CPU 52 in the personal computer 33, and FIG. 9B shows the operation of the CPU 83 in the microcomputer 72.
Shows the operation of.

The CPU 52 reads out the procedure of the decoding and error correction processing stored in the storage device 54 and sends it as control software to the CPU 83 via the I / O ports 51 and 84 (step C1). The CPU 83 receives the control software (step D1) and stores the software, that is, the procedure of the decoding and error correction processing in the memory 82.

The phase of the pulse signal input to the PLL circuit 42 is adjusted, passes through the discriminator 43, and is then sent to the I / O port 81 of the microcomputer 72 as a reproduction signal from the optical disk 34. . CPU
83 fetches the data of the phase-adjusted pulse signal (hereinafter referred to as the pulse signal) output from the I / O port 81 into the memory 82 (step D2). When the data is taken into the memory 82, the CPU 83 performs the decoding process on the data of the pulse signal based on the procedure of the decoding process already stored in the memory 82 (step D3). When this process ends, the CPU 83 next
Performs error correction processing on the decoded data based on the error correction procedure stored in the memory 82 (step D4). When this process ends, CP
The U83 reads the data after the error correction processing from the memory 82 and transmits it to the CPU 52 of the personal computer 33 via the I / O ports 84 and 51 (step D5). When this transmission is completed, the CPU 83 confirms whether or not the data acquisition from the discriminator 43 is completed (step D6). If the data acquisition is not completed, the process returns to step D2 and the above-mentioned operation is repeated again. If the acquisition is completed, the operation of the microcomputer 72 is ended.

Next, the CP of the personal computer 33
The U52 receives the data after the error correction processing from the microcomputer 72 via the I / O port 51 (step C2). The CPU 52 uses the data after the error correction processing as read data from the optical disc 34 on the personal computer 33, that is, performs data processing (step C3). When step C3 ends, C
The PU 52 confirms whether to end the process (step C4). If the read data from the optical disk 34 still needs to be processed, step C
Returning to 1, the above-mentioned processing is repeated for the microcomputer 72 again. If no processing is required, the operation of the personal computer 33 is ended.

As described above, the PLL circuit, the discriminator, the decoder, and the error correction circuit provided in the conventional optical disk drive are as shown in FIG.
And the discriminator 43 are provided as an interface unit 71 outside the optical disk drive 31, and a microcomputer 72 is provided in the interface unit 71, and the functions of the decoder and the error correction circuit are provided by the microcomputer 72.
The optical disc drive 31
The configuration can be simplified. Further, since data is transferred between the microcomputer 72 and the personal computer 33, high speed transfer becomes possible.

In the personal computer 33,
The functions of the decoder and the error correction circuit are assigned, the functions are transferred to the microcomputer 72 during the reproduction processing, and the decoding and the error correction processing are executed as the processing of the CPU 83. It is not necessary to configure by hardware such as a circuit, and various decoding processes and error correction processes can be easily handled by only changing the data in the storage device 54 in the personal computer 33. Therefore, even when information is written on the optical discs 34 by different modulation methods, even for optical discs 34 of different recording formats,
The reproduction process can be easily performed by the same optical disk drive 31 without changing the above hardware.

[0050]

As described above, according to the present invention,
In an optical disc reproducing system for reading information from an optical disc and reproducing the information, a PLL circuit and a discriminator are provided as an interface unit outside the optical disc drive, and further decoding and error correction processes are performed on a host device external to the optical disc drive, or a host device outside the optical disc drive. Since it is executed by the microcomputer controlled by the device, the structure of the optical disk drive can be simplified.
Further, since it is possible to easily make a wide variety of changes in the above-mentioned decoding and error correction, it becomes possible to perform reproduction processing on the same optical disk drive for optical disks of different recording formats.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an optical disk reproduction system according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the configuration of the personal computer and the connection with the interface unit in the embodiment.

FIG. 3 is a flowchart illustrating processing operations of decoding and error correction in the embodiment.

FIG. 4 is a configuration diagram of an optical disk reproducing system according to a second embodiment of the present invention.

FIG. 5 is a diagram for explaining the configuration of the personal computer and the connection with the interface section in the embodiment.

FIG. 6 is a flowchart illustrating processing operations of decoding and error correction in the embodiment.

FIG. 7 is a block diagram of an optical disk reproducing system according to a third embodiment of the present invention.

FIG. 8 is a diagram for explaining the configuration of the personal computer and the connection with the interface section in the embodiment.

FIG. 9 is a flowchart illustrating processing operations of decoding and error correction in the same embodiment.

FIG. 10 is a block diagram of a conventional optical disc reproducing system.

FIG. 11 is a diagram illustrating in detail the configuration of an optical disc drive in a conventional optical disc reproduction system.

[Explanation of symbols]

 31 optical disk drive 32, 61, 71 interface section 33 personal computer 34 optical disk 35 disk motor 36 disk motor servo circuit 37 pickup 38 pickup control circuit 39 system control circuit 40 preamplifier circuit 41 waveform shaping circuit 42 PLL circuit 43 discriminator 51, 81, 84 I / O port 52,83 CPU 53,82 Memory 54 Storage device 55 Keyboard 56 CRT 62 Serial / parallel conversion circuit 72 Microcomputer

Claims (3)

[Claims] 1. A pickup for irradiating an optical disk with laser light, detecting return light and converting the light into an electric signal, a preamplifier circuit for amplifying an output signal from the pickup, and a pulse signal for the output signal of the preamplifier circuit. An optical disc drive for reading information recorded on the optical disc, a PLL circuit for performing a synchronization process on the pulse signal output from the waveform shaping circuit, and a synchronization process by the PLL circuit. A discriminator for detecting the pulse signal generated during a predetermined time period, and an interface unit for reproducing the information signal read from the optical disk drive based on the detection result of the discriminator; The signal of the above information reproduced by the interface unit is received, and decoding and error correction processing is performed. Optical disk reproducing system characterized by comprising a host device that performs. 2. A pickup for irradiating an optical disc with laser light, detecting return light and converting it into an electric signal, a preamplifier circuit for amplifying an output signal from the pickup, and an output signal of the preamplifier circuit for converting into a pulse signal. An optical disc drive for reading information recorded on the optical disc, a PLL circuit for performing a synchronization process on the pulse signal output from the waveform shaping circuit, and a synchronization process by the PLL circuit. A discriminator for detecting the generated pulse signal in a predetermined time period, and a serial / parallel conversion circuit for performing serial / parallel conversion on the reproduced pulse signal output from the discriminator, An interface section for reproducing the information signal read from the optical disk drive, Optical disk reproducing system characterized by receiving a signal of the information reproduced, and and a host device which performs decoding and error correction processing by the face portion. 3. A pickup which irradiates an optical disk with laser light, detects return light and converts it into an electric signal, a preamplifier circuit which amplifies an output signal from this pickup, and an output signal of this preamplifier circuit into a pulse signal. An optical disc drive for reading information recorded on the optical disc, a PLL circuit for performing a synchronization process on the pulse signal output from the waveform shaping circuit, and a synchronization process by the PLL circuit. The optical disc comprises a discriminator for detecting the generated pulse signal in a predetermined time period, and a microcomputer for decoding and error correcting the reproduced pulse signal output from the discriminator. An interface unit for reproducing the information signal read by the drive, and Decoded by interface unit, an optical disc reproducing system, characterized in that receives and processes the signal of the information subjected to error correction processing, and and a host device for performing control of the microcomputer.