JP2910749B2 - Recordable optical disk recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus, and more particularly to an optical disk recording / reproducing apparatus suitable for recording an optical disk on which music information or the like has been edited or additionally recorded. is there. 2. Description of the Related Art Optical discs (CDs) on which music information is converted into digital signals and recorded are sold as high-quality music sources. However, such optical discs are exclusively for reproduction. In recent years, recordable optical disks have been developed. Such recordable optical disc 1
As shown in FIG. 5, the (recording disk) has a perpendicular magnetization film having a magneto-optical effect provided on a disk recording surface having a diameter of 12 cm, and adopts a recording format that allows compatibility with conventional optical disks. ing. The track of the optical disk 1 has a depth of λ / 8 (λ
Is formed in a spiral shape by a pre-group 2 of laser light wavelength), and pits 3 serving as frame signals are formed at regular intervals along the circumferential direction on the lands between the pre-groups 2 to form an embossed area 4 having an uneven surface. The middle of the embossed area 4 is a data recording area 5 where magneto-optical recording is performed. In the lead-in portion on the inner circumference side of the optical disc 1, there is provided an area TOC (Table of Content) section 6 which can record various data (song number, start time, end time, etc.) indicating recording information of the optical disc. ing. [0004] The one composed between pits 3
The frame period accommodates 588 bits of data, of which the first 24 bits are used as a synchronization signal portion.
The remaining 14 × 32 bits (32 symbols) are used as performance information data and parity bits. (However, three margin bits are added for coupling between symbols.) The recording / reproducing apparatus for the recordable optical disc 1 as described above is capable of reproducing even a conventional CD. In order to achieve such a configuration, it is preferable to use the same data as that of a conventional CD for data such as recorded music information. That is, the recorded data is EFM (Eight to Fourteen Modul
ation) modulation and CIRC (Cross Interleave)
It is preferable that error correction by the Reed-Solomon Code) method be performed. [0006] By the way, the conventional CD
Ability error correction CIRC scheme employed may be corrected with C ₁ error correction for the detailed description thereof is omitted to correct only the symbol codes of one word, the data distributed over several frames by interleaving in the is formed by C ₂ error correction having, even error data is generated when reading the recorded data of a portion of the optical disk, before and after a plurality of frames of the error data (108
Error correction can be performed with reference to data in the frame. Therefore, as shown in FIG. 6 (a), if a new music B is written from time T to the already recorded music A, for example, when such recorded information is reproduced, FIG. As shown in FIG. 2), there is a problem that an abnormal sound (bubbling sound) is generated during a period ΔT of several frames before and after the time point T. The occurrence of abnormal sound has been made to occur by C ₂ error correction as described above, is due to the correction relevant interleaving Erroneous be lost in this period is made, this time period ΔT
Output an abnormal sound such that sounds of samples A and B alternately occur for each sample. According to the present invention, a light spot is radiated to a track of an optical disc to record information by direct light of the light spot, and the reflected light of the light spot is detected to detect the light. In a recording / reproducing apparatus capable of reproducing information recorded in a recording / reproducing apparatus, an operation means for instructing recording start, an operation means for instructing recording stop, a fader for fading out or fading in an input signal, and An encoder that generates time zero data, controls the fader so that the input signal fades out in response to the recording stop instruction, and records the zero time data on the optical disc for a predetermined time after the fade out. Control the
The encoder controls the encoder to record zero data on the optical disk for a predetermined time in response to the recording start instruction, and controls the fader so that an input signal fades in after the predetermined time has elapsed. It is. By the recording / reproducing apparatus of the present invention, for example, when a connection recording or the like in which new music information or the like is added from the middle of a music piece is performed, a fade-out,
At the same time when the fade-in process is performed, 0 data is recorded in a plurality of frame periods, so that abnormal sound can be prevented from being generated during reproduction. FIG. 1 shows a block diagram when recording (reproducing) information (music) on a recordable optical disk. The recording disk 1 is driven by a motor 11 to rotate at a constant linear velocity. Have been. The optical head 12 includes optical components such as a laser diode, a photodetector, a lens, and a half mirror, and is controlled so that recording / reproduction is performed by irradiating the recording disk 1 with a laser beam. Further, a magnet 13 for applying an external magnetic field is provided at a position facing the optical head 12 with the recording disk 1 interposed therebetween, and this magnet is controlled so that its magnetic pole is reversed at the time of erasing and at the time of recording. . Among the RF signals (high-frequency signals) read out by the optical head 12, the signals corresponding to the above-mentioned embossed area 4 are sent to the emboss reproduction amplifier 14 in particular, and the TO
The signals corresponding to the C section 6 and the data recording area 5 are sent to the MO reproduction amplifier 15. The absolute time information (address signal) from the emboss reproduction amplifier 14 is input to a microcomputer (CPU) 17 via a decoder 16, and the output from the MO reproduction amplifier 15 is transmitted to a reproduction signal processing circuit 18. Deinterleaving and other signal processing are performed, and the disk information recorded in the TOC unit 6 is sent to the buffer memory 19. Then, the performance information is converted into an analog signal by the D / A converter 20, and output to the terminal 2 via the output amplifier 21.
2 is output as a reproduction signal. On the other hand, at the time of recording, music information and the like supplied from the terminal 23 are input to the A / A via the input amplifier 24.
The signal is input to the D converter 25 and converted into a digital signal.
Then, the data is input to a recording signal processing circuit 27 via an encoder 26, and is input to a recording amplifier 28 after data blocking, interleaving, error correction code and the like are added, and a predetermined value of the recording disk 1 is modulated by modulating a laser diode. Data is written to the track. In this circuit, the output data of the A / D converter 25 is supplied to the CPU 17 as in a recording / reproducing apparatus proposed earlier by the present applicant, for example, to detect a joint photographing portion between music pieces. The music number, start time, end time, and the like are written in the buffer memory 19, and these information are recorded in the TOC unit 6 immediately before the disk is taken out. Reference numeral 17a denotes an input device for designating the operation mode of the apparatus and the position of the recording / reproduction music information, and 17b denotes a display device for displaying the recording / reproducing state of the disc. Such a recording / reproducing apparatus can perform the following recording operation by the above-described configuration. When music information B is to be recorded from the middle of already recorded music information A, the source of the music information B is connected to the terminal 23, and the apparatus is set to the recording mode by operating the keys of the input device 17a. Then, under the control of the CPU 17, the music information B is digitally processed in the recording signal processing circuit 27 to modulate the laser power. The recording process is started by a plurality of frame periods (for example, 108 frame periods) of the encoder. Muting data, for example, 0 data is output from 26. After the elapse of the plurality of frame periods, digital data (PCM data) of music information B to be recorded is input. When the recording of the music information is stopped, the recording of the recording information B is interrupted by a stop button key (or a pause button key). The control is performed such that the recording is completed by setting a plurality of frame periods after the end to a muting state (writing of 0 data). In this recording / reproducing apparatus of a recordable optical disk, the above-described operation can be performed by the CPU 17, so that the data of the music information A already written and the music to be written next are written. The connection portion of the information B data is muted with 0 data during the period ΔT as shown in FIG. 2 (a). Since this period ΔT substantially corresponds to the interleave period of the C ₂ error correction described above, for example, the recorded data of the music information A (prior to T ₁ ) may be corrected by the data of the music information B by interleaving. Whilst also eliminated that the data of the recording data (T ₂ after the time) of the music information B is modified by the data of the music information a. In this case, there is no sound during the muting period ΔT, but it is required that this period be as short as possible. Therefore, as shown in FIG. 2 (b), in order to prevent the music information A and B from being abruptly cut off, a hatched area before and after the muting period ΔT is fade-out or fade-in controlled. It is effective. [0017] The music information A, fadeout B, fade-control that-out <br/> in be performed by the encoder 26. However, the easy easy manner can be performed by connecting the analog-like faders 29 to the terminal 23 as shown by the dashed line in Figure 1. In addition, such an encoder 26 and a
Fader by encoding means such as
When the out and fade-in processes are performed, as shown in FIG. 2 (c), even if the muting period .DELTA.T 'is slightly shorter than the error correction interleave period, the occurrence of an abnormal sound is not noticeable audibly. This has the advantage that the silence period in continuous recording can be reduced. FIG. 3 shows the recording operation as described above.
7 shows a flowchart at the time of recording start and a flowchart at the time of recording stoppage performed by U17. In this embodiment, the number of frames to be muted is 10
It is set to 8 (17 ms), but in order to simplify the control program of the CPU, it may be controlled so that one round of the recording track is 0 muted in the continuous recording portion. In the recording / reproducing apparatus, the splice recording time during recording or the track position thereof is recorded as an address signal in the TOC section 6 of the optical disk. Reproduction can be performed on the reproduction side so as not to generate an abnormal sound. That is, an encoder 31 and a fader 32 are added to the playback system circuit shown in FIG. 4 to constitute a playback device. When the CPU 17 detects the address of the spliced recording portion, the same as in the recording operation. The output data of the encoder 31 is controlled to be 0 data for a predetermined period. If the connected portion is detected at the time of reproduction as described above, even if an optical disk which has not been subjected to the muting process as described above is mounted on the reproducing device at the time of performing the splicing recording, the above-described reproduction is performed. According to the circuit, the playback sound is muted when a splicing portion is encountered during playback, so that no abnormal sound is generated. Further, before and after that, the fader 32 is operated, and the above-mentioned FIG.
Alternatively, when the data of the music information as shown in (c) is output, the spliced portion can be reproduced more smoothly. As described above, the recordable optical disk recording / reproducing apparatus according to the present invention can be used when recording music information or the like at the time of recording or performing editing such that the music information is changed on the way. Before the start of recording, 0 data is added to the input signal to be added to the recording system, and recording is performed while performing fade-in processing. At the end of recording, fade-out processing is performed on the recording signal to perform 0 data for a predetermined period. The signal processing is performed so that the recording is terminated by adding a symbol, so even if discontinuity occurs in the data such as error correction at the connection between the old recording information and the new recording information, a difference occurs at the connection during playback. There is an effect of preventing generation of sound. Further, since the muting is performed in the digital signal processing part, there is an advantage that the circuit is simplified and the generation of noise is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a recording / reproducing apparatus for a recordable optical disk. FIG. 2 is a data waveform diagram of a connection recording portion. FIG. 3 is a flowchart of a CPU when recording information on an optical disc. FIG. 4 is an explanatory diagram of an optical disc reproducing apparatus for reproducing the added information according to the present invention. FIG. 5 is a plan view showing an example of a recordable optical disc and an enlarged view of a recording surface and a part thereof. FIG. 6 is an explanatory diagram of an abnormal sound output during reproduction. [Description of Signs] 1 recording disk, 12 optical head, 17 microcomputer, 18 reproduction signal processing circuit, 20 A / D converter, 31 encoder, 32 fader

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Claims (1)

(57) [Claims] By irradiating a light spot on a track of an optical disc and recording digital information by direct light of the light spot, it is possible to detect reflected light of the light spot and reproduce digital information recorded on the optical disc. Operating means for instructing recording start, operating means for instructing recording stop, and adding zero data for a predetermined time to the input recording signal
And fade out or fade that level.
Encoder for recording in optical disk by controlling
A da means, when the recording stop according to an operation means for instructing said recording stop
Fade out the level of the recording information during recording, and then
Control to add zero data for a predetermined time, and start recording.
At the beginning, the location depends on the operation means for instructing the start of recording.
Add zero data for a fixed time, and then adjust the level of recorded information.
Control to fade in, and the above zero data is continuous
The recording data interleave period
A recordable optical disk recording / reproducing apparatus characterized in that the setting is made such that: