JPH058760U - End information recording disk and end fade-out recording device - Google Patents

Abstract

(57) [Summary] [Purpose] Perform fade-out recording at the end of recording. [Structure] In the lead-in area of the disc master D1,
The final address code generated by the final address generation circuit 8 is recorded plural times, and the ATIP code generated by the ATIP code generation circuit 9 is sequentially recorded in the recording area.
When the TIP code matches the final address code, the code comparison circuit 10 ends the operation of the ATIP code generation circuit 9 and ends the recording.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

      The present invention relates to a magneto-optical disk and a digital recording device using the magneto-optical disk. End fade-out recording device.

[0002]

[Prior art]

  A disc record called a compact disc is a lead-in on the inner circumference side. The TOC information includes the start address of each program and the final time code in the area. Is recorded. In addition, using this magneto-optical recording principle Product development with standardization for recorders that record signals of the same format Is being promoted. This magneto-optical disc record was previously called the guide track. A groove is formed. This guide track is called an ATIP code Address information is multiplexed with the subcode frame period, The row carries information as an FM modulated wave of the ATIP code. Therefore, in the record At this time, a predetermined amount of audio data is recorded according to the ATIP code.

[0003]

[Problems to be solved by the device]

  In the case of the above-mentioned optical recording disc, the recording exceeds the amount of recordable audio data. May be done. Therefore, the audio recording suddenly ends at the end of the recording, and a The sound may be interrupted in the middle of the gram, which may cause discomfort to the user. It was Therefore, it becomes necessary to fade out the audio information at the end of recording. It is very troublesome to search and store the end of recording in advance, and the device configuration is complicated. I have no choice.

[0004]

[Means for Solving the Problems]

  Therefore, in the present invention, the address information of the recording end near the starting end of the guide track is previously set. The first feature is to form a guide track of this disc at the start of recording. Address information at the end of recording that was reproduced near the beginning of the Compare the address information and add fade-out to the recorded audio information from near the end of the recording. The second feature is to obtain.

[0005]

[Action]

  Therefore, according to the present invention, it is only necessary to reproduce the lead-in area of the magneto-optical disk. The end of recording can be detected in advance, and the address information of the guide track to be played during recording can be obtained. The vicinity of the end of recording is predicted by reproducing, and the recording signal is based on this prediction. Fade out is added.

[0006]

【Example】

  Hereinafter, the present invention will be described with reference to an illustrated embodiment. Figure 1 shows a magneto-optical disk It is a circuit block diagram of a master recording circuit that forms a guide track.

[0007]   Reference numeral D1 in FIG. 1 denotes a disk in which a photosensitive material such as photoresist is uniformly applied. It is a master. Reference numeral 1 is built in the recording head housing and used as a reading beam. Generates a recording beam such as an argon laser or He-Cd laser with a shorter wavelength Laser light source. Reference numeral 2 changes the beam deflection angle according to the control voltage. The beam deflecting means is composed of an EO deflector. Reference numeral 4 indicates focus control means and And a recording beam that is displaced by the tracking control means is an optical disc master. It is an objective lens for focusing and irradiating on the guide track of D1. Reference numeral 14 is The optical disc master D1 is rotated at a linear velocity of 1.2 m / s, and 52 This is a disk motor that outputs five rotation detection pulses. Reference numeral 6 is a recording beam Is integrated with the recording head housing to detect the radial irradiation position of the This is a radius information decoder. Reference numeral 11 is a base used for disc rotation control. It is a fixed oscillator that generates a quasi clock. Reference numeral 12 denotes the radius information decoder 6 The reference clock is divided in the range of (4 to 1.7 KHz) based on the beam position information of It is a variable frequency dividing circuit for generating a reference clock. Reference numeral 13 is a disk mode Disk for synchronizing the rotation detection pulse from the controller 14 with the output of the variable frequency divider 12 It is a servo circuit. Reference numeral 8 is a final address for generating a final address code set in advance. This is an address code generation circuit. Reference numeral 9 is an elapsed time composed of minutes: seconds: frames It is an ATIP code generation circuit that represents information as an absolute address on the disk master D1. Reference numeral 10 indicates the final address code from the final address code generating circuit 8 and the ATI. The ATIP code from the P code generating circuit 9 is compared, and when the codes match, the ATI code It is a comparison means for stopping the generation of the ATIP code of the P generation circuit 9. Reference numeral 7 is Select the final address code when recording in the read-in area and record in the program area It is a selection circuit which sometimes selects an ATIP code. Reference numeral 5 is an output code of the selection means 7. -FM-modulates the mode at the center frequency (22.05 KHz) and outputs the output from the beam. This is an FM modulation circuit that is supplied to the deflection unit 2.

[0008]   FIG. 2 is a block diagram of a recording circuit for recording on the magneto-optical disk. Second Reference numeral D2 in the figure is a duplicate disc whose master is the disc master D1 in FIG. A magneto-optical disk having a magnetic recording film formed thereon. Reference numeral 25 is a semiconductor laser light. Output of 0.5mW or less when reproduced on the medium and 3-9mW when recorded Is. Reference numeral 26 is a reproduction amplifier for amplifying the reproduction output of the pickup 25. is there. Reference numeral 28 represents the reproduction of the reference signal 22.05 KHz from the fixed oscillator 27. Recording that controls the rotation of the disk motor 29 so that the output frequencies of the amplifier 26 match. It is a re-servo circuit. Reference numeral 24 is an FM recovery signal for demodulating the modulated ATIP code. It is a tuning circuit. Reference numeral 23 is an ATIP for decoding the demodulated ATIP code. It is a decoder. Reference numeral 22 indicates the read-in area from the ATIP decoder 23. Data latch that stores the last recorded address code by latch pulse Circuit. Reference numeral 20 is an ATIP code output from the ATIP decoder 23. It is a sub-code generating circuit that forms and derives a sub-code based on the following. Reference numeral 21 is The final address code stored in the data latch circuit 22 and the ATIP decoding -Compare the ATIP codes that are sequentially reproduced from the header 23, and check a few seconds before the final address. A comparison circuit (fade-out signal generation circuit) that detects and controls the fader circuit 15 is there. Reference numeral 15 indicates the level of the recorded voice in conjunction with the generation of the detection output of the comparator 21. It is a fader that fades out. In this embodiment, the fader circuit 15 is connected to the A / D Although it is placed in the front stage of the conversion circuit 16, it is placed in the rear stage and digitally fades out. You can Reference numeral 17 is an error correction code added to the data of the recorded voice 2 channels. It is a CD-DA encoder that additionally forms a recording signal in the CD format. Mark No. 19 is a recording signal amplified by the head drive circuit 18 (0.3 to 0.5 A) Is a magnetic head for magnetic field modulation.

[0009]   The operation of this embodiment will be described below with reference to FIGS. 1 and 2. First, the disc When forming a master, the irradiation position of the recording beam is always kept by the radius information decoder 6. The variable frequency divider circuit 12 that detects and divides the output of the fixed oscillator circuit 11 is The reference signal corresponding to the radial position is derived from the variable frequency dividing circuit 12 by inputting the Therefore, the disk servo circuit 13 ensures that the rotation detection signal is phase-synchronized with this reference signal. To control the rotation of the disc motor 14 to drive the disc D1 to rotate at a constant linear velocity. There is. On the other hand, the code selection circuit 7 makes a final address when recording the lead-in area. Code is selected, and the ATIP code is used for recording in the normal information recording area. Is selected. The selected code is FM-modulated and supplied to the beam deflecting means 2. Thus, the recording beam is deflected in the radial direction of the disc master D1. This deflected beam , Is reflected by the reflection mirror 3 and is collected by the objective lens 4 on the recording surface of the disc master D1. It is illuminated by light. As a result, continuous exposure traces meandered by the FM modulation signal are formed. Is made. In this embodiment, the last address code is continuous in the lead-in area. Will be recorded. Further, the code comparison circuit 10 is generated by the ATIP code generation circuit 9. When the ATIP code matches the final address code, the ATIP code is generated. The operation of the path 9 is stopped, and the recording area has the ATIP code in the lead-in area. The process ends when it matches the final address code of. The data exposed in this way The disk master D1 is developed to form a guide track.

[0010]   A magnetic layer is formed on the surface of a duplicated disc that duplicates the developed disc master D1. The formed magneto-optical disk D2 is a modulated AT that is reproduced by a pickup during recording. The IP code is used as a comparison signal for the recording / reproducing servo circuit 28, and the fixed oscillator 27 is used as a reference. Moreover, the rotation of the disk motor is controlled at a constant linear velocity. Meanwhile, play the lead-in part The final address code demodulated by the Stored in path 22. In addition, the recorded sound is converted to AD and then recorded in CD format. It is converted into data and supplied to the magnetic head 19 via the head drive circuit 18. , Magnetic field modulation is performed for recording. The comparison circuit 21 uses the final address code and AT A few seconds before the IP code matches, fader 15 is activated to fade out the sound. Let Therefore, the audio signal is faded out at the end of recording during reproduction.

[0011]

[Effect of device]

  Therefore, according to the present invention, it is possible to easily fade out the voice information, and the effect is great. Is.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a disk master recording circuit.

FIG. 2 is a block diagram of a recording circuit of the magneto-optical recording device.

[Explanation of symbols]

21 Comparison circuit (fade-out signal generation circuit) 15 faders 8 Final address code generation circuit

Claims (2)

[Scope of utility model registration request] 1. A disc record formed by sequentially updating and forming address information along a spiral guide track at a predetermined cycle, and terminating information recording in which final address information is additionally formed in the vicinity of a starting end of the guide track. disk. 2. A disk recorder for recording audio information on a terminal information recording disk, wherein address information is added along a spiral guide track and final address information is added near the start end of said guide track. A fade-out signal generation circuit that compares the reproduced final address information with the sequentially reproduced address reproduction information and generates a fade-out signal in the vicinity of the final address, and a fader that fades out recorded audio information when the fade-out signal is generated. End fade-out recording device.