JPH05225695A - Optical disk recorder - Google Patents

Abstract

PURPOSE:To shorten the duplicating time of an optical disk. CONSTITUTION:Sound data is compressed and made to sound compressed data by an audio encoder 17 and after this sound compressed data is converted into a CDROM format by a CDROM encoder 14, it is converted into EFM by an EFM encoder 12 and recorded on an optical disk 1. The sound compressed data gained from the data of the CDROM format reproduced from the optical disk 1 is expanded by an audio decoder 18 and an audio signal is gained. The sound compressed data is inputted from the outside by an I/O interface 19 and recorded on the optical disk and also, the sound compressed data reproduced from the optical disk is outputted to the outside from an output interface 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recorder for compressing and recording audio, and more particularly to a means for duplicating an optical disk in a short time.

[0002]

2. Description of the Related Art An MD system capable of compressing and recording audio data with a conventional optical disk recorder does not have an interface for inputting externally compressed audio data, and an audio signal before being compressed is input. It was

Further, there is no interface for outputting the signal reproduced from the optical disc as compressed audio data, and the reproduced audio compressed data is decompressed and outputted as an audio signal to the outside.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention When an optical disc is duplicated using two conventional optical disc recorders described above, the audio compressed data reproduced by one optical disc recorder is decompressed and sent to the other optical disc recorder. Therefore, there is a drawback that the duplication time is long.

The present invention has been made in view of the above points, and an object thereof is to provide an optical disk recorder capable of duplicating an optical disk in a short time.

[0006]

An optical disk recorder according to the present invention compresses audio data into audio compressed data,
EF after converting compressed audio data to CDROM format
An optical disk recorder for M-converting and recording on an optical disk, decompressing audio compressed data obtained from CDROM format data reproduced from the optical disk to obtain an audio signal is provided with an input / output interface to input audio compressed data from the outside. Recorded on the optical disc,
The audio compressed data reproduced from the optical disk can be output to the outside.

[0007]

When reproducing the optical disk on which the compressed audio data is recorded, the reproduced compressed audio data is stored in the buffer RAM.
, And the data is taken out by the first-in first-out method and expanded to become a voice signal.

The optical disk is not accessed until the data in the buffer RAM is exhausted, and when the data in the buffer RAM is exhausted, the optical disk is accessed and reproduction is continued. When the compressed audio data is decompressed and restored to the audio signal in this manner, the reproduction time becomes longer than that in which the optical disc is continuously accessed, and the actual music time is reached.

That is, when an optical disk is duplicated by using the conventional optical disk recorder, it takes time corresponding to the actual length of the music.

According to the optical disk recorder of the present invention,
The compressed audio data reproduced from the optical disk by one optical disk recorder is output as it is through the interface and can be input to the other optical disk recorder. The optical disk recorder to which the audio compression data is input records the audio compression data on the optical disk as a recording format without decompressing the audio compression data.

The speed of writing data to the optical disk and the speed of reading data from the optical disk are the same. Since the optical disk recorder on the reproducing side can continuously access the optical disk, the duplication time is shorter than that of the conventional one.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an optical disk recorder which is an embodiment of the present invention. In the figure, reference numeral 1 denotes an optical disc, which is a recordable / reproducible or reproducible disc. In the case of a recordable blank disc, a wavy groove for tracking is formed,
A wobble signal in which a 2.05 kHz carrier is FM-modulated is generated.

The wobble signal includes an ADIP (Address Implement Groove) that represents the recording address of the optical disc by the biphase signal.

The optical disk 1 is clamped on a turntable fixed to the rotary shaft of a spindle motor 2. The spindle motor 2 rotates the optical disc 1, and the signal from the light receiving element of the optical pickup 3 is input to the RF amplifier 5.

The RF amplifier 5 outputs a focus error signal and a tracking error signal to the servo circuit 6. The servo circuit 6 generates a tracking coil supply current from the tracking error signal, and also generates a focusing coil supply current from the focus error signal.

The laser spot tracks the pre-groove of the waveform when the above current is applied to the tracking coil of the actuator of the optical pickup 3, and the focus of the laser spot is on the signal surface of the optical disk 1 due to the current applied to the focusing coil. Can be matched.

A wobble signal having the same period as the pre-groove waveform is input from the RF amplifier 5 to the ADIP decoder 7, the ADIP signal is demodulated and output to the microcomputer 8. Based on this ADIP signal, the microcomputer 8 recognizes the position of the laser spot on the optical disc.

The wobble signal also indicates the linear velocity of the optical disk, from the ADIP decoder 7 to the servo circuit 6.
The servo circuit 6 controls the current of the spindle motor 2 on the basis of the signal output to the CLV (constant linear velocity) control.

The optical pickup 3 is sent in the radial direction of the optical disk by a linear motor (not shown). The linear motor is supplied from the servo circuit 6 with a current generated from the DC component of the tracking error signal during normal recording or reproduction. Further, the laser spot of the optical pickup 3 can be moved to an arbitrary position on the optical disc designated by the microcomputer 8 by the actuator and the linear motor.

A current is supplied to the laser diode of the optical pickup 3 by the laser diode driver 4, and the current becomes stronger at the time of recording than at the time of reproducing by the command of the EFM encoder 12.

The EFM encoder 12 also causes the magnet driver 26 to output a current to be supplied to the magnetic head 25 at the time of recording an optical disk, and inverts the current according to the EFM signal. Optical disc 1 heated by laser spot
Is magnetized in the direction of the magnetic field applied by the magnetic head 25 and E
The FM signal is recorded.

Reference numeral 21 is an A / D converter, which linearly converts an external L channel and R channel analog audio signal into a 16-bit digital signal. Reference numeral 22 is an input interface for external 16-bit linear data, and is generally called a digital audio interface receiver.

The output signal of the A / D converter 21 or the input interface 22 is selected by the switch S1 and input to the audio encoder 17. The audio encoder 17 compresses the input audio data as intensity data of each band, and FIG. 2 shows the relationship between the audio 16-bit linear data and the number of audio compressed data as a compression rate ⅕.

The voice compression data output from the audio encoder 17 is buffer RA via the switch S2.
It is put in M16. By switching the switch S2 to the buffer RAM 16, data similar to the compressed audio data output from the audio encoder 17 via the input interface 19 can be taken in from the outside.

The data stored in the buffer RAM 16 is taken out to the CDROM encoder 14 by the first-in first-out method. CDROM encoder 14
Converts the compressed audio data into the CDROM format for each block having the same size as one block of the CD format.

FIG. 3 shows a comparison between the CD format and the CDROM format. In a CD (compact disc), 12 samples of 16-bit (1 word) audio data for L channel and R channel are included in one EFM frame, and 98 EFM frames are combined into one block.

That is, one block contains 12 × 98 = 1176 words (2352 bytes) as shown in FIG. 3B.

In the CDROM format, as shown in FIG. 3A, 2352 bytes of data are collected in one block. In the CDROM format, the sync pattern is 12 bytes and the bedder is 4 bytes, and it becomes one block including the audio data of 2336 bytes.

The CD format signal output from the CDROM encoder 14 is input to the EFM encoder 12 and EFM converted for each block. At this time, the subcode data output from the microcomputer 8 is incorporated into the EFM signal.

In this way, the CDROM encoder 14 outputs E
The FM-converted EFM signal inverts the current of the magnet driver 26 as described above.

The microcomputer 8 includes a ROM and an R
It has a built-in AM and controls the entire device. In addition, a signal is input from the keyboard 10 and a signal is further output to the display 9 to display the operating state of the device.

Although the recording operation of the optical disk has been described above, when reproducing the signal recorded on the optical disk, the laser diode driver 4 outputs a constant current smaller than that at the time of recording. The polarization plane of the reflected light is rotated from the laser spot according to the direction of the magnetization recorded on the optical disc, and a signal for reproducing the recording is output from the light receiving element of the optical pickup 3.

The recording / reproducing signal (RF signal) of the light receiving element is R
The EFM decoder 11 after being amplified and shaped by the F amplifier 5
Entered in. The EFM decoder 11 demodulates the EFM signal to obtain a CD format signal and outputs it to the CDROM decoder 13. The subcode signal demodulated at that time is input to the microcomputer 8.

The CDROM decoder 13 extracts audio compression data from a CD format signal and buffer RAM
Put in 15. The audio compressed data stored in the buffer RAM 15 is taken out by the audio decoder 18 and expanded to restore the audio signal.

The audio signal output from the audio decoder 18 is converted into an analog signal by the D / A converter 23 and output as an analog audio signal. Further, the audio digital signal output of the audio decoder 18 can be output as a digital signal from the output interface 24. By switching the switch S3, the input signal at the time of recording can be output to the monitor via the D / A converter 23 or the output interface 24.

The compressed audio data can be externally fetched from the buffer RAM 15 via the output interface 20.

When duplicating an optical disc using two of the above devices, as shown in FIG. 4, the output interface 20 of the optical disc recorder of the reproducing system and the input interface 19 of the optical disc recorder of the recording system are connected to each other to compress the audio compressed data. Are transferred block by block.

Since the compressed audio data is recorded on the optical disk without being expanded, the copy time is shortened to a ratio substantially equal to the compression rate as compared with the normal reproduction.

[0039]

When two optical disc recorders of the present invention are connected to duplicate an optical disc, the duplication time is shortened to a rate substantially equal to the compression rate as compared with normal reproduction.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a relationship of the number of data when compressing audio data.

FIG. 3 is a diagram showing a data structure of each block of a CDROM format and a CD format.

FIG. 4 is a diagram showing a connection relationship when the optical disc recorder of the embodiment is used for duplication of an optical disc.

[Explanation of symbols]

 1 Optical Disc 2 Spindle Motor 3 Optical Pickup 4 Laser Diode Driver 5 RF Amplifier 6 Servo Circuit 7 ADIP Decoder 8 Microcomputer 9 Display 10 Keyboard 11 EFM Decoder 12 EFM Encoder 13 CDROM Decoder 14 CDROM Encoder 15 Buffer RAM 16 Buffer RAM 17 Audio Encoder 18 Audio Decoder 19 Input Interface 20 Output Interface 21 A / D Converter 22 Input Interface 23 D / A Converter 24 Output Interface 25 Magnetic Head 26 Magnet Driver

Claims (1)

[Claims] 1. Audio compression data is compressed into audio compression data, the audio compression data is converted into CDROM format, EFM converted and recorded on an optical disk, and audio compression data obtained from CDROM format data reproduced from the optical disk is converted. In the optical disk recorder that obtains the audio signal by decompressing, it is possible to provide the input / output interface, input the audio compressed data from the outside and record it on the optical disk, and output the audio compressed data reproduced from the optical disk to the outside. Optical disc recorder.