JPH0877709A - Recording/reproducing device - Google Patents

Abstract

PURPOSE: To provide a recording/reproducing device capable of protecting interrupted recording edit information even when a recording edit operation is interrupted due to great fluctuations in a power voltage during recording, or editing of information in an optical magnetic disk MD. CONSTITUTION: When a fluctuation occurs in a power voltage in a range exceeding an allowable range, a part from the recording start to the interruption of sound signal data during recording is temporarily stored in a buffer memory 4 and a part from the recording start to the interruption of character information data during recording is temporarily stored in another memory. When the power voltage is returned within the allowable range, recording/reproducing of the sound signal and the character information is controlled by a system controller 15 so that respective protected data are read and continuously recorded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a recording method capable of protecting the interrupted recording / editing information even if the recording / editing operation is interrupted by a large power supply voltage fluctuation during recording or editing of information on a magneto-optical disk. Reproduction device

[0002]

2. Description of the Related Art As a recording / reproducing system for recording / reproducing an audio signal and an address (positional information) of a music related to the magneto-optical disk, and character information such as a title and an artist, there is the following system. That is, the audio signal to be recorded is compressed, vibration-proof compensated, error-correction coded, and modulated to obtain a modulated audio signal, which is recorded in the audio recording area of the magneto-optical disk, and the audio recording area of this magneto-optical disk is reproduced. Complementary demodulation of the obtained reproduced modulated audio signal, error correction decoding, vibration compensation compensation and expansion, and output the reproduced audio signal obtained,
In addition, character information to be recorded (voice signal address to be recorded) is stored in the UTOC (User Table Of Contents)
As a recording / reproducing system for a magneto-optical disk which is configured to directly record in the (nts) area and directly output reproduced character information from the area, there is a mini disk (hereinafter referred to as MD) system.

This MD system has ± 10% of the rated voltage.
It is designed to operate normally if it is about a certain degree, and can sufficiently cope with a normal fluctuation of the power supply voltage. However, in the case of a large fluctuation of the power supply voltage exceeding the normal fluctuation of the power supply voltage, it is not designed to sufficiently compensate for this, and in such a case a normal recording / reproducing operation cannot be performed.

In order to improve this state, the MD system adopts a dual power supply system, and when the power supply voltage exceeds a normal fluctuation range, it adopts a system in which the power supply is switched from an AC power supply to a battery. However, when the MD system is driven by a battery for a long time, a voltage drop gradually occurs, and there is a possibility that a normal recording / reproducing operation cannot be performed when the voltage drops to about -10% or less of the rated voltage.

[0005]

As described above, in the conventional MD system, the voltage value is not within ± 10% of the rated voltage regardless of whether the AC power source or the battery is used. , I had the following problems. That is, M
The functions of the D system include a commercially available soft MD, a playback function for playing a self-recorded MD, a recording function, and an editing function for the user to edit the audio signal of recorded music. Functions that are problematic for voltage sags and fluctuations that exceed normal power supply voltage fluctuations are:
Recording function and editing function. While the recording function was operating, there was a problem that even if the audio signal was recorded normally from the start of recording to the occurrence of an abnormal power supply voltage fluctuation, it could not be recorded normally after the fluctuation occurred. However, if the recording history (positional information such as the track number) is not written to the UTOC at the end of this recording, there is no way to read out the audio signal recorded halfway. Also, during the operation of the editing function, the record history (recording count) of the recorded audio signal (text information about the recorded audio signal (song address (position information), song title, character information such as artist, etc.)) ) Is written in the UTOC area, but if an abnormal power supply voltage fluctuation occurs during such writing, the character information cannot be normally recorded from the start of recording to the time when the abnormal power supply voltage fluctuation occurs. As a result, there was a problem that all the character information that was normally recorded halfway was lost.

The present invention provides a recording / reproducing apparatus capable of protecting the interrupted recording / editing information even if the recording / editing operation is interrupted due to a large power supply voltage fluctuation during recording or editing of information on a magneto-optical disk. The purpose is to do.

[0007]

In order to solve the above problems, the present invention provides a recording / reproducing apparatus having the following structure. The modulated audio signal obtained by compressing the audio signal to be recorded, compensating for the vibration resistance, performing error correction coding, and modulating the audio signal is a magneto-optical disk MD.
Recording on a magneto-optical disk MD which outputs a reproduced audio signal obtained by complementary demodulation of the reproduced modulated audio signal obtained by reproducing the magneto-optical disk MD, error correction decoding, vibration resistance compensation, and expansion. A recording / reproducing apparatus A used in a reproducing system for recording / reproducing character information related to the audio signal to be recorded, wherein the power supply voltage is within an allowable range (recording / reproducing apparatus A during recording of the audio signal or the character information. The fluctuation range for the fluctuation of the primary power supply seen from the above is the adjustable voltage characteristic (the fluctuation range within ± 10% for the rated 100V (volt))
If the power supply voltage fluctuates within the allowable range, the recording interruption data is continuously recorded and protected until the power supply voltage recovers within the allowable range (within a fluctuation range within ± 10% of the rated 100V). A recording / reproducing apparatus including a control unit (system controller 15) for performing recording / reproducing control of the audio signal and the character information.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The recording / reproducing apparatus of the present invention will be described in detail below with reference to FIGS. 1 is a block diagram of a recording / reproducing apparatus of the present invention, FIG. 2 is a diagram for explaining a power supply state of the recording / reproducing apparatus of the present invention, FIG. 3 is a diagram for explaining a recording format of an MD, and FIG. , Fig. 5 shows audio signals,
It is a flowchart which shows the recording procedure of character information.

As shown in FIG. 1, an MD device A embodying the recording / reproducing device of the present invention includes an AD converter 1, an audio compression encoder / decoder 2, a vibration-proof memory controller (shock-proof memory controller) 3, a buffer. Memory (shock proof memory) 4, EFM (Eight to Fo
urteen Modulation)) / CIRC (Cross InterleaveRee
d-Solomon Code) Encoder / decoder 5, head drive circuit 6, recording magnetic head 7, spindle motor 8, optical pickup 9, objective lens 10, feed motor 11, R
It is composed of an F amplifier 12, an address decoder 13, a servo control circuit 14, a system controller 15, a display unit 16, an operation unit 17, and a DA converter 18. MD in the figure is a mini disk. The audio compression encoder / decoder 2 has an audio compression encoding function (during recording) and an audio expansion decoding function (during reproduction). Further, the EFM / CIRC encoder / decoder 5 has an error correction coding / EFM modulation function (during recording) and an EFM demodulation / error correction decoding function (during reproduction).
Have. The system controller 15 has a built-in or separate memory (RAM,
(Not shown). Further, the operation unit 17 is composed of operation buttons and a jog dial (not shown).
The display unit 16 is an LCD (liquid crystal) display, and the character information can display a maximum of 32 characters.

Next, regarding the operation of the above-mentioned MD device A,
(1) voice recording operation, (2) voice reproducing operation, (3) character recording operation, and (4) character reproducing operation will be described in this order.

(1) Audio Recording Operation The analog audio signal to be recorded is AD-converted by the AD converter 1 and supplied to the audio compression encoder / decoder 2 as a digital audio signal. The audio compression encoder / decoder 2 converts this digital audio signal into ATRAC (Adaptive TR).
An encoding operation for audio compression coding is performed by the ansform Acoustic Coding method, and about 1/5 of the original signal information amount is performed.
The compressed digital audio signal obtained by compression is output intermittently to the buffer memory 4 via the vibration-proof memory controller 3 and is temporarily stored therein.

The vibration-proof memory controller 3 causes the optical pickup 9 and the recording magnetic head 7 to inadvertently vibrate due to external vibration when the recording magnetic head 7 magneto-optically records a modulated audio signal on the MD. When a so-called off-track occurs and a partial dropout of the modulated audio signal recorded in the MD occurs, this recording magnetic head 7
Is instantly returned to the track position of the MD where the track deviation occurs, and the modulated audio signal of that portion is overwritten (re-recorded) again. Therefore, it is the original signal of the modulated audio signal required for this overwriting, and the buffer memory 4 from the buffer memory 4 to the compressed digital audio signal temporarily recorded in
The operation is controlled by the system controller 15 so that the FM / CIRC encoder / decoder 5 is read again. The anti-vibration memory controller 3 reduces the transfer rate of the compressed digital audio signal supplied from the audio compression encoder / decoder 2 to about 1/5 for such anti-vibration compensation.
The compressed digital audio signal is output to the EFM / CIRC encoder / decoder 5.

The vibration-proof memory controller 3 outputs the compressed digital audio signal stored in the buffer memory 4 to the EFM / CIRC encoder / decoder 5 at the same signal rate as before compression in accordance with the read control of the system controller 15. The EFM / CIRC encoder / decoder 5 performs an interleaving process and a process of generating and adding an error correction code on the compressed digital audio signal read from the buffer memory 4 in accordance with the encoding control of the system controller 15, and then performs EFM modulation. The obtained modulated audio signal is output to the head drive circuit 6.

The head drive circuit 6 amplifies the modulated audio signal by a predetermined amount and supplies it to the recording magnetic head 7. The recording magnetic head 7 magneto-optically records the modulated audio signal on the MD. In addition, the system controller 15 controls the servo control circuit 1 according to the output signals supplied from the anti-vibration memory controller 3 and the EFM / CIRC encoder / decoder 5.
4 is driven and controlled, the rotation speed of the spindle motor 8 is controlled to a constant linear velocity, and a display signal for displaying the above-described series of recording operation states is output to the display unit 16. The system controller 15 executes such a series of recording operations,
This is executed based on operation control signals such as start and stop supplied by a specific key input operation of a large number of keys of the operation unit 17. Thus, the audio signal can be recorded on the MD.

(2) Sound Reproducing Operation The sound signal recorded in the MD by the above-mentioned (1) recording operation is reflected light obtained by irradiating the MD from the optical pickup 9 through the objective lens 10 with laser light. You can read this by The signal thus read is supplied from the optical pickup 9 to the RF amplifier 12, where it is amplified by a predetermined amount, and then the address decoder 1
3, output to the EFM / CIRC encoder / decoder 5 and the servo control circuit 14, respectively. Address decoder 1
Reference numeral 3 decodes only the address data from the reproduction signal supplied from the RF amplifier 12, and outputs this to the EFM / CIRC encoder / decoder 5. The EFM / CIRC encoder / decoder 5 performs EFM demodulation of the reproduction signal supplied from the RF amplifier 12 according to the address data supplied from the address decoder 13, and then performs error correction decoding processing and deinterleaving processing on compressed digital audio. The signal is continuously output to the buffer memory 4 via the anti-vibration memory controller 3 and sequentially stored therein.

The vibration-proof memory controller 3, when the modulated voice signal magneto-optically recorded on the MD is read by the optical pickup 9, is vibrated from the outside to cause the optical pickup 9 to vibrate.
Violently vibrates and a so-called off-track occurs, and M
When a part of the reproduced signal read out from D is dropped out, the optical pickup 9 is instantly returned to the MD track position where the off-track has occurred, the modulated audio signal of that part is read again, and the buffer memory is read. The system controller 15 controls the operation so that the compressed digital audio signal stored in 4 is read by the audio compression encoder / decoder 2 instead of the signal in which the partial omission occurs. This control of the anti-vibration memory controller 3 is called anti-vibration compensation (shock proof) control. The anti-vibration memory controller 3 uses the E
The transfer rate of the compressed digital audio signal supplied from the FM / CIRC encoder / decoder 5 to this is about 1/5.
Compressed digital audio signal
Output to the decoder 2.

The compressed digital audio signal stored in the buffer memory 4 is supplied to the audio compression encoder / decoder 2 according to the read control of the anti-vibration memory controller 3 of the system controller 15. The audio compression encoder / decoder 2 decodes this digital audio signal by audio expansion and decoding, expands it to about 5 times the information amount of the audio compressed signal, and returns it to the original digital audio signal.
This digital audio signal is output to the DA converter 18 and is output as an analog signal obtained by DA conversion here.

The system controller 15 drives and controls the servo control circuit 14 according to each output signal supplied from the RF amplifier 12 via the vibration-proof memory controller 3, the EFM / CIRC encoder / decoder 5, and the servo control circuit 14. , A feed motor for controlling the rotation speed of the spindle motor 8 and for moving the optical pickup 9 to the part where the above-mentioned track deviation occurs, in order to return the optical pickup 9 to the track position where the track deviation occurred. 11, the display unit 16 outputs a display signal for displaying the above-described series of reproduction operation states, and the operation unit 17 starts the reproduction operation.
A designation signal that designates an operation such as stop is input. Also,
The system controller 15 also has a function of a character code conversion unit 22 described later. In this way, the audio signal can be reproduced from the MD.

(3) Character Recording Operation The MD device A described above has an editing function in addition to recording and reproduction. There are five more editing functions ("TITLE"
(Title) ”,“ JOIN ”,“ DIVI ”
DE (divided), RENUM (sorted), E
RASE (erasing) ”).

Of these, "TITLE (title)" can be given a title for each song. The added title can be displayed and confirmed on the display unit 16. By the way, M with a mark such as [text information / English]
Album names, song names, etc. are written in the D software in advance and can be displayed.

Now, the operation section 17 described above is composed of operation buttons and a jog dial. The operation buttons are the basic operation buttons ("PLAY", "STOP / C").
ANCEL (stop / cancel) ”,“ PAUSE / SC
"ROLL (pause / feed character)", "EJECT" (eject disc), "AUTO SEARCH / CU"
6 operation buttons "RSOR (cue / cursor move)", "REC (record)", number keys ("1" to "1")
0 ”,“ +10 ”/“ 0 ”),“ TRACK MARK
ING (track marking), "PLAY MODE
(Playback mode selection), "TITLE (disc name / song name)", "EDIT (editing mode selection)", "ENTER"
(Execute) ”,“ REPEAT ”,“ SET ”
(Set) ”and“ DISPLAY / CHARA (display switching / character selection) ”.

By using the "TITLE (title)" function, it is possible to give a name of up to 32 characters to a recorded song or MD. There are three types of characters that can be used: katakana, uppercase letters, and lowercase letters. If a name is given to each song, the selected song is displayed by name on the display unit 16, so that the contents can be easily confirmed.

Next, a procedure using the "TITLE (title)" function will be described. Set MD for recording Set device A once to stop.
When naming a song, select the song number and play it back. Press the "TITLE" button. The indicator (neither shown) on the side of the jog dial changes from red to green. Select the character type Press the "DISPLAY / CHARA" button. Each time you press, "Katakana" → "English capital letters" → "English lowercase letters" →
Switches in the order of "Katakana". To switch the character selection range (katakana, upper case, lower case) (send characters), press the "PAUSE / SCROLL" button. Also, keep turning the jog dial to select characters. If you make a mistake in the name, you can correct it before you press the "ENTER" button. To correct the last character,
Press the "STOP / CANCEL" button. The character is deleted, so enter the correct character. To correct the characters in the middle, click "AUTO SEARCH / CURSO
R "" Press the button to move the cursor to the character you want to correct. When deleting, press the "STOP / CANCEL" button. If you want to change the character, enter the correct character. Enter your name. Turn the jog dial to move the cursor to the character you want to write, and press the "SET" button one by one. Press the "ENTER" button The name is recorded on the MD. “UTOC Wr
Recording is completed when "iting" disappears. "UTOC Writing"
Do not shake or vibrate the MD device A during the display. In this way, character information (katakana / uppercase / lowercase) can be recorded on the MD.

(4) Character Reproducing Operation Regarding character reproducing operation, during reproduction of MD, the reproduction control of the system controller 15 transfers the optical pickup 9 to the UTOC area of the MD and reproduces the character information recorded therein. Then, by displaying this on the display unit 16, the character information (katakana / uppercase / lowercase) can be reproduced.

By the way, character information (katakana / uppercase / lowercase) used in the above character recording operation.
Is recorded in the UTOC area in the MD recording format including a TOC area (lead-in area), a UTOC area, an audio recording area (program area), and a lead-out area, as shown in FIG. Incidentally, the area where the UTOC area and the audio recording area are combined is called a recordable area (recordable area).
An area including the TOC area (lead-in area), the recordable area, and the lead-out area is called an information area (information area). For more information,
The UTOC area is composed of three clusters, one to three, and each cluster is sector 0 to sector 3.
It consists of 32 sectors of 1. Sector 0, which composes one cluster, has data on track address, sector 1 has data on ASCII title (disk / track), sector 2 has data on recording date, sector 3 is undecided, and sector 4 is Data regarding the title (ISO 8859 / SHIFT-JIS) is recorded. Sectors 5 to 7 are undecided, and sectors 8 to 31 are unused.

Incidentally, in the case of (1) pits (= lead-in area of premastered disc (playback-only MD) / recordable disc (recording / playback MD)) ... 1 cluster = 36 sectors, the breakdown of which is Main Data = 32 sectors; Audio Data, Sub Data = 4 sectors; Reserved, Li
nking = 0 sector; No Linking. In the case of (2) groove (UTOC area / audio recording area / lead-out area of recordable disc) ... 1 cluster =
There are 36 sectors, of which Main Data = 32 sectors; Audio Data, Sub Data = 1 sector; Reserved, Link
ing = 3 sectors; Run-in, Linking and Run-out Data (in order to realize intermittent recording, recording is performed in cluster units, and to connect clusters to clusters (= Linking (to complete interleaving of EFM, Linking area) uses 3 sectors).

As a result, of the input Katakana character string (upper part), uppercase character string (middle part), and lowercase character string (lower part), the characters in the uppercase character string and lowercase character string are the sectors in one cluster of the UTOC area. It is recorded in 1. The characters in the input Katakana character string are recorded in sector 4 in one cluster in the UTOC area.

The power supply state of the MD device A having the above-described structure is divided into three systems, that is, a digital system, an audio system and a servo system, as shown in FIG. The digital system requires a stable DC voltage (for example, 4.5 V) with a small ripple supplied to the audio compression encoder / decoder 2 including the system controller 15, the anti-vibration memory controller 3, the buffer memory 4, and the like. The audio system requires a voltage supplied to the AD converter 1, the DA converter 18, and an amplifier (not shown). What is supplied to the amplifier D is a DC voltage (for example, ± 12 V) considering the dynamic range, and the AD converter 1 and DA.
The converter 18 is supplied with a single 5V power supply (eg + 5V). The servo system requires a direct current voltage to be supplied to the actuator (not shown) of the optical pickup 9 and the spindle motor 8 and is, for example, 8.5V.

The voltage value of the digital system for performing the shock proof control described above operates at a lower voltage value than that of the audio system and the servo system. Therefore, MD device A
Is the voltage sag characteristic of the power supply (40% lower than the rated 100V,
If there is a performance standard that satisfies the condition that there is no abnormality during 10 cycles (200 ms) at 50 Hz), the voltage supplied to the audio system and the servo system within 200 ms from the start of the voltage drop when the power supply is instantaneously dropped. Is lower than the specified value, if the voltage supplied to the digital system that executes shock proof control satisfies the specified value,
The data transfer operation and the like can be normally performed without any problem.

As a result, the compressed digital signal read from the digital buffer memory 4 is converted into EF.
Through the M / CIRC encoder / decoder 5 and the head drive circuit 6, it is detected that the above-mentioned instantaneous drop of the power supply has occurred while magneto-optically recording in the voice recording area of the MD by the recording magnetic head 7. Then, the system controller 15 temporarily stores the address value (position information corresponding to the track number) of the recording of the compressed digital signal in the buffer memory (not shown) for controlling the writing and reading, so that from the start of recording. It is possible to protect the address value (position information) of the compressed digital signal during reading until the momentary power drop occurs.

Similarly, the character information from the operation unit 17 input via the digital system controller 15 is magneto-optically transferred to the UTOC area of the MD by the recording magnetic head 7 via the head drive circuit 6. During the recording, after detecting the occurrence of the power supply sag, the system controller 15 temporarily stores the character information in the middle of input in the buffer memory for controlling the writing and reading, so that the power supply is started from the recording start. It is possible to protect the character information in the middle of input until the occurrence of the instantaneous drop.

Here, the standard characteristic (40
%, 200 ms) will be described.

(During reproduction) When the primary voltage drops by 40%, the voltage on the output side of the rectifier circuit becomes about 5.1 V, which is below the voltage at which the servo system operates normally, and the servo system does not operate normally. . Therefore, during this period, the signal cannot be read from the MD via the servo system.
Since the digital system including the system controller 15 can operate normally during ms, only the data transfer operation in the digital system can be normally performed without any problem, and the reproduction can be continued by the shock proof function.

(Recording) Recording magnetic head 7 during recording
It is necessary to supply a current of about 400 mA, and the voltage drop due to this is not negligible. Therefore, when the voltage drop of 40% of the power supply overlaps with the recording, the voltage on the output side of the rectifier circuit becomes lower than about 5.1 V, and the entire system including the digital system may not function at all. Therefore, when the voltage drops, the recording operation is temporarily suspended (without supplying a current of about 400 mA to the recording magnetic head 7), the voltage on the output side of the rectifier circuit is maintained at about 5.1 V, and the data in the digital system is changed. In this state, the system controller 15 temporarily stores the address value of the compressed digital signal in the middle of reading in the buffer memory for controlling the writing and reading during 200 ms so that only the transfer operation can be normally operated. It is possible to protect the address value of the compressed digital signal during reading until the occurrence of low. The system controller 15 constantly monitors the voltage change during recording (at the time of recording), and once the supply voltage of the servo system becomes 6 V or less, the recording is temporarily stopped, and the address of the compressed digital signal during reading which is accumulated in the buffer memory after the voltage is recovered. A value is read, and based on this, a compressed digital signal read from the next address value can be continuously recorded on the MD via the recording magnetic head 7.

By the way, as described above, MD- (buffer memory 4) -audio compression encoder / decoder 2-AD converter 1 is used to compress and expand analog audio signals.
The data transfer rates differ between the / DA converters 18. That is, the transfer rate between MD- (buffer memory 4) -audio compression encoder / decoder 2 is about 1/5, and the transfer rate between the audio compression encoder / decoder 2-AD converter 1 / DA converter 18 is 1. . Depending on the transfer rate,
Reading from the MD and writing to the MD are intermittent operations. A compressed digital audio signal is temporarily stored in a buffer memory 4 called a shock proof memory by utilizing the period of this transfer rate difference (about 4/5). Of course, it goes without saying that the buffer memory 4 is provided with a memory capacity capable of temporarily storing again the data that is being read when the power supply is instantaneously lowered. MD depending on the transfer rate
Reading from and writing to MD are intermittent operations.

As long as the compressed digital audio signal stored in the buffer memory 4 does not overflow or underflow (as long as the compressed digital audio signal is not stored in the buffer memory 4 at the time of recording), the recording / reproducing data is not recorded. There is no discontinuity. By storing a full compressed digital audio signal in the buffer memory 4 at all times, even if the signal cannot be read from the MD, the audio compression encoder / decoder 2 can operate until the buffer memory 4 becomes empty. Data can continue to be sent to the DA converter 18. The power supply voltage can be monitored (the power supply is momentarily cut off and the power supply is momentarily lowered) by the system controller 15 constantly monitoring the voltage of the power line of the servo system.

As described above, in the recording of music in the MD system, after recording the music data, the recording result (position information such as track No., address value) is UTO.
It does not hold unless it is recorded in the user record information area called C. Therefore, if the power is cut off during recording, U
Since this recording result cannot be recorded in the TOC, all information from the time when recording is started will be lost. In order to solve this problem, the system controller 15 backs up the recording history (address information of each song, etc.) in the memory of the system controller 15, and when the power is turned on again or the power is restored, Record the history up to when the power was restored to the UTOC. As a result, data can be normally reproduced from the start of recording until the power is cut off.

Now, the recording procedure of the audio signal performed by the system controller 15 will be described. As shown in FIG. 4, the system controller 15 determines whether or not recording is in progress, and if not, performs recording processing (S10, S1).
1). On the other hand, even during recording and the power supply voltage is normal, the above-described recording process is performed (S10 to S12). If recording is in progress and the power supply voltage is not normal, recording is interrupted (S1).
2, S13). If the power supply voltage returns to normal after the recording is interrupted, the recording is restarted (S14, S15).

Next, a recording procedure of character information performed by the system controller 15 will be described. As shown in FIG. 5, the system controller 15 determines whether or not recording is in progress, and if not, performs recording processing (S20, S2).
1). On the other hand, even when recording is in progress and there is no music change, the above-described recording processing is performed (S20 to S22). If there is a song change during recording, the address of the recorded song is stored in memory (S
22, S23). If the power supply voltage returns to normal after the power supply voltage drops while storing the address of the recorded music, the history up to immediately before is written to the UTOC (S23 to S).
26).

[0040]

As described above, since the recording / reproducing apparatus of the present invention is provided with the control unit, when the power supply voltage fluctuates within the width exceeding the allowable width during the recording of the voice signal or the character information, the power supply is changed. Since the recording interruption data can be protected until the voltage returns to within the allowable range, the complicated work of re-inputting the recording interruption data can be eliminated, which is suitable for portable use. There is an effect that a recording / reproducing apparatus can be provided.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a recording / reproducing apparatus of the present invention.

FIG. 2 is a diagram for explaining a power supply state of the recording / reproducing apparatus of the present invention.

FIG. 3 is a diagram for explaining an MD recording format.

FIG. 4 is a flowchart showing a recording procedure of an audio signal.

FIG. 5 is a flowchart showing a recording procedure of character information.

[Explanation of symbols]

 4 buffer memory 15 system controller (control unit) A recording / reproducing device, MD device MD magneto-optical disk, mini disk

Claims (1)

[Claims] 1. A reproduced modulated sound obtained by compressing a sound signal to be recorded, compensating for vibration resistance, performing error correction coding and modulating, and recording the modulated sound signal on a magneto-optical disk, and reproducing the magneto-optical disk. Used in a recording / reproducing system for a magneto-optical disk that outputs a reproduced audio signal obtained by complementarily demodulating a signal, performing error correction decoding, compensating for vibration, and expanding, and records character information related to the audio signal to be recorded. A recording / playback device that plays back, and if the power supply voltage fluctuates within the allowable width while recording audio signals or character information, the recording is suspended until the power supply voltage returns to within the allowable width. A recording / reproducing apparatus comprising a control unit for controlling recording / reproduction of the audio signal and character information so as to protect data.