JPS5940333A - Disk record reproducer - Google Patents

Abstract

PURPOSE:To improve the operability of a disk record reproducer, by obtaining a pause state after searching the head part of the 1st music when a power supply is applied, then turning off the laser light source of a pickup if no operation command is given within a fixed period. CONSTITUTION:When a power switch 311 is turned on, an FF circuit 313, and an FF315 are set via an initializing circuit 312. Then a search control signal is supplied to the 1st music searching circuit 317 via an AND gate 316, and a control circuit 201 sends a signal needed for searching to a disk reproduction system 202. Thus a searching operation is started. Then the 1st music is serached, a detecting signal is delivered from a search end detecting circuit 318. A pause control signal is supplied to a pause signal input circuit 321 via gates 319 and 320 by the detecting signal of the circuit 318 and the output Q of the FF315. Thus the initialization is over. The search end detecting signal is supplied to a counter 322, and a carry signal is delivered after a fixed period. Then a light source OFF signal is supplied to a laser ON/OFF control circuit 324 to turn off the light source.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a disc record playback device suitable for, for example, a CD (optical compact disc) type DAD (digital audio 7'). Regarding its control 7 stem.

[Technical background of the invention and its problems]

Recently, in the field of audio equipment, PCM ()frus code modulation) is being used to achieve high fidelity reproduction as possible.
Digital recording and playback methods using technology are being adopted.

This is called digital audio, and it means that the audio characteristics are independent of the characteristics of the recording medium and are far superior to those using conventional analog recording and playback methods. This is because it has been established in principle.

In this case, a system that uses a disk as a recording medium is called a DAD system9, and optical, electrostatic, and mechanical recording and reproducing methods have been proposed. Regardless of which method is adopted, the playback device that embodies it is required to be able to satisfy various advanced control functions and performance that are not found in conventional devices. .

In other words, if we take the CD system as an example,
CLV (Constant Linear Velocity) method is used to create a transparent resin disk with a diameter of 12crR1 and a thickness of 1.2m, coated with a metal thin film that forms bits (irregularities with different reflectances) corresponding to digital (PCM) data. Approximately 500~20
The disc is rotated at a variable rotational speed of 0 ftp, m, and is reproduced in a linear tracking manner from the inner circumference side to the outer circumference side using an optical pickup with a built-in semiconductor radar and photoelectric conversion Yonago. The track pitch is 1.6 μm, and a huge amount of information that can be played in stereo for about 1 hour on one side is digitized and recorded in the program area (radius 25 to 58 mm) along with address data. This can be easily seen from the fact that the maximum and minimum song number data, etc., are digitized and recorded in the lead-in area (radius 23rd to 25th tone).

However, this type of f-isc record playback device that has been known in the past has not been developed with excellent operability and display performance to satisfy its advanced control functions. It was believed that this was an issue that needed to be solved.

[Purpose of the invention]

Therefore, this invention was made in view of the above points, and is particularly applicable to a disc record playback device that plays back a disc on which digitized data is recorded.
It is an object of the present invention to provide an extremely good disc record reproducing device which has been improved so that it can reliably perform advanced control functions with a simple configuration, thereby contributing to improved operability.

[Summary of the invention]

That is, the disc record playback device according to the present invention optically plays back a disc record in which data to be played and its address data are both digitized and recorded, and the disc record is played back when the power is turned on. a first means for causing the pickup to search for the head portion of the first data to be reproduced in the data to be reproduced and initialize it to a pause state; The present invention is characterized by comprising second means for turning off the radar light source of the pickup when a predetermined operation command is not issued within a time.

[Embodiments of the invention]

First, an outline of a CD-based DAD reproducing apparatus to which the present invention is applied will be explained.

That is, FIG. 1 shows a front external view, and 11 in the figure
Reference numeral 1 denotes a Kangaru pocket-type disc loading section provided on the front surface of the cabinet 110 so as to be openable and closable. On the left side of the disk loading section 111 are provided an EJECT key 112 for opening and closing the disk loading section and a POWER key 113 for connecting and disconnecting the power supply.

Further, on the upper right side of the disk loading section 11, there is a display section 114 for making various displays described later, a reverse (REV) key 115 for so-called backward operation, and a fast forward (REV) key 115 for fast forward operation.
FF) key 11C and the play (PL) key for play operation.
AY) key 117 are provided. Similarly, in the middle row there are a NEXT PLAY key 118 and a REPEAT key 119, which will be described later, as well as a PAUSE key 120 and a STOP key.
5TOP) key 121 are provided. Similarly,
Number keys 122-131 of 0.1.2...9 on the bottom row
, memory read (MREAD) key 132, memory (MEMORY) key 133 and clear (C)
LEAR) key 134 is provided.

Then, the above-mentioned display section 114 displays the EJEC
T) Display 114h, search (5EARCH) display 114b, -”-ERROR display, 114C
.

REPEAT display 114d, MANUAL display 114j, auto play (
AUTO) display 114e, memory (MEMORY)
Display 114f and 8 channel memory indicator (ME-MORY INDICATOR) 114
g, a music number (MUSICNO) display 114h, and a time (TIME) display 1141.

In addition, the play (PLAY) key 117 and the pause (P
AUSE) key 120 also allows play (PLA).
Y) The display 114 is provided with a PAUSE display 114t.

FIG. 2 shows the electric circuit system of the CD type DAD playback device shown in FIG.
By selectively operating 134, the disc reproducing thread 202 is controlled to a predetermined state via the control circuit 201 comprising a microcomputer, an interface circuit, etc., and necessary displays are displayed on the display section 114 described above. It is something that does.

That is, when the disk motor 204 and the pickup feed motor 205 are driven from the control circuit 201 via the external control circuit 203, the disk reproduction thread 202 reproduces the data recorded on the disk 2θ6 by the pick-up roller f207. The reproduced signal is sent to the RF signal detection circuit 20.
Send to B. This RF signal detection circuit 20B separates the reproduced signal into a signal supplied to the Boo 2 circuit 209 and a signal supplied to the demodulation circuit 210.

Here, the Boo 2 circuit 209 causes the big anog 207 to perform focus servo and tracking servo, and also sends out various signals to the pickup feed shimoter 205 to perform linear tracking servo.

Further, the demodulation circuit 210 separates a synchronization signal for address detection from the reproduced signal, and transmits the synchronization signal to the address detector 2.
At the same time, the reproduced signal t-(EFM) from which the synchronizing signal is separated is demodulated and supplied to the D/A converter 212.

Then, the address signal detected by the address detector 21 is taken into the RAM 213 via the control circuit 201, and is used to perform necessary control functions.

Furthermore, the reproduced data returned to an analog signal by the D/A converter 212 is subjected to necessary error correction, deinterleap, error correction, and other processing before being used to drive the speaker 216 to produce sound. become.

In FIG. 2, 214 is a ROM for driving the control circuit 201 with a predetermined program, and 216 is a display output control circuit for driving the display section 114 in a predetermined state.

Next, each key 11 in FIG. 1 and FIG.
2, 116 to 134 and the functions of the display section 114 will be explained.

[Number (0 to 9) keys 122-131] These are keys for inputting numbers, and are used when specifying a playback song at the time of searching (searching for the beginning) and when writing to the memory.

[MEMORY key 133] Numeric key is used to write data to the memory channel.

[CLEAR key 134] This key is used to change the song number display 114h, which is currently displaying the above-mentioned numeric key data, to the original song number (address) display.

Incidentally, when the memory read (M READ key 132) and the clear (CIJAR) key 134 are operated at the same time, a memory all clear (ALL CLEAR) operating state is established.

[Memory read (M READ) key 132] Used to read the written contents of the memory channel.

(REPEAT) key
-1 1 9] Repeat (repeated playback) is turned on and off each time this key is operated.

However, the repeat function is off when the power is turned on.

[PLAY key 117] This key is used both when used alone and for memory read (M
RIiAD) key 132't, or numbers (0-9)
There are cases where the key is operated subsequent to the operation of keys 122 to 13.

First, when used alone, the manual gray mode is set, and if the state immediately before operating this key is a pause state, which will be described later, the pause state is canceled and the play state is entered. However, if the state immediately before the key is operated is in the auto gray mode (described later) and the key is in the gray state, the key will shift to the manual gray mode, and if the key is operated during a search operation, it will return to the play state after the search is completed. It is made to be.

When used in conjunction with the memory read (MREAD) key 132 or number (0 to 9) keys 122 to 131, as an auto play mode, the key is not in the search operation state, but after the search is completed, it is in the play state. It is done like this.

Please note that an error (ER), which will be described later, occurs immediately before operating this key.
If the ROR display 114C is blinking, this key has the same operation as the CLEAR key 134.

[PAUSE key 120] This key can also be used alone or after the operation of the memory read (M READ) key 132 or number (0-9) keys 122-131. .

First, when used alone, if the state immediately before operating this key is a gray state, the play state is canceled and the pause state is entered. Further, if the operation is performed during a search operation, the search is completed and the device enters a pause state.

When used in combination with the memory read (M READ ) key 132 or the numeric (0 to 9) keys 122 to 131, a search operation state is entered.

Please note that an error (ERROR) occurs immediately before operating this key.
If the display 114c is blinking, this key operates in the same way as the CLEAR key 134.

[NEXT PLAY key 118
First, when this key is operated in the manual gray mode, a search operation is performed with the next song (actually, the next TNO track number) as the target address.

Further, when this key is operated in the auto gray mode, a search operation is performed using the contents of the next memory channel as the target address.

Furthermore, if this key is operated during a search operation, the search operation will be performed with the target address being the TNO next to the display TNO in manual gray mode, and the next memory in the display memory channel in auto gray mode. A search operation is performed using the channel contents as a target address.

Note that this key operation does not cause the Louis/Pause state to change.

[Fast forward (FF) key 116] When this key is operated, a forward operation is started.

If you operate this key in auto gray mode, the forward operation will be performed while you are operating it, but if the position where you stopped the operation is outside the currently playing song, the search operation will be performed for the next memory channel. It is designed to do this.

[Reverse (REV) Key 115] When this key is operated, a packed word operation is started.

Note that when a packed word operation is performed in the auto gray mode, if the stop position deviates from the song being played, a search operation is performed for the previous memory channel.

[Stone f (5 TOP) key 121] When this key is operated, a transition is made to a manual presade, and after the first song search is performed, a pause state is entered. However, this excludes the case where the player is already in a pause state at the beginning of the first song.

[EJECT key 112] If you operate this key during playback, the playback status will be canceled.The disc motor will stop, the laser diode will turn off, and the pickup will return to the starting position approximately 1 second later. The disk loading section 111 is configured to open.

In addition, when operating each key mentioned above, a so-called CHIRP sound (approximately 3.5 kHz) is emitted as proof that the key operation has been accepted.
(output for 0.072 seconds) is generated.

[EJECT indicator 114m, 1 After the EJECT key 112 is operated, it flashes at a frequency of approximately 3 Hz until the pickup returns to the starting position. When the disc loading section 111 opens, it lights up and the disc loading section When 111 is closed, the light is turned off.

[Search (5EARCH) indicator 114b] Lights up when all the TOC (table off content) data in the lead-in area recorded as index data on the disk is read normally and the search for the first song is completed. It is done like this.

[Error (ERROR) indicator 114c] When an error (described later) occurs, it blinks in synchronization at about I Hz, blinking for about 0.67 seconds and extinguishing for about 0.33 seconds, but when the blinking starts The light goes out when about 10 seconds have elapsed since then or when the CLEAR key 134 is operated. The following error conditions are: ■ When approximately 20 seconds have passed since the disk was set upside down ■ A command was issued to perform the numeric (0 to 9) numeric key 122 to 13 operation, but the specified TNO does not exist in the f4 disk. ■ If memory read (M READ ) key 132 or next gray (NEXT P) is pressed in auto gray mode
When a search operation is commanded by operating the LAY ) key 118, but the TNO of the specified memory channel contents does not exist on the disk. When it is determined that the file does not exist: ■ When the search operation is not completed even after 20 seconds have passed after the start of the search operation ■ When an attempt is made to write TNO=00 as memory channel data.

[Libby] (REPEAT) Indicator 114d"J is designed to light up when the repeat function is on.

[MANUAL indicator 114j] Lights up when in manual gray mode or eject mode.
Flashes while reading the lead-in area (approximately 3 Hz cycle)
It is done like this.

[Auto gray (AUTO) indicator 114@] It is designed to light up in the auto gray mode.

[Memory (■ groove 0RY) display 114f] Numbers (0 to 9
) When the keys 122 to 131 are operated, the light is turned on when memory writing is possible, and the light is turned off after about 10 seconds or when a key other than the numeric keys is operated.

[MEMORY INDICAT
OR) 114gJ In this case, there are 8 channels, and in all states, the portion corresponding to the memory channel being written is lit.

In addition, when in auto gray mode, the part corresponding to the memory channel being played flashes (approximately 3 Hz cycle). Also, if you operate the number (0 to 9) keys 122 to 131, you can write to the memory. state, the part corresponding to the lowest numbered memory channel that can be written to will blink (approximately 3
Hz period).

First, when the memory read (M READ ) key 133 is operated, a portion corresponding to the memory channel being read out flashes (at a cycle of approximately 3 Hz).

[Music number (MUSICNO) display 114h and time (
TIME) Display 1x4s) These are composed of a total of 8 digit numerical displays, and are collectively referred to as an address (data) display section. Toe 9, two digits each from the left side are TNO and X.

They represent MIN (minutes) and SEC (seconds), and in the eject mode, all lights are off, and in the playback mode, the address being played is displayed.

In addition, when the number (0 to 9) keys 122 to 13 or the memory read (M READ) key 133 are operated,
Only TNO and X are displayed, and MIN and 5EC (time elapsed from the beginning of the first song) are blanked.

During the search operation, TNO and X flash,
MIN and SEC are blanked.

[PLAY display 114k]! [PAUSE indicator 1141] O that is designed to light up when in PAUSE mode. Next, an embodiment of the present invention based on the above outline will be explained. To explain, in this invention, when the power is turned on, the pickup searches for the beginning of the first track on the disk and initializes it to a pause state, and if no operation command is issued within a certain period of time thereafter. It is characterized in that it is configured to turn off the radar light source of the pickup.

That is, as shown in FIG. 3, in which the same reference numerals are given to the parts that are configured in the same way as in FIG. As a result, a first flip-flop circuit 313 is set via an initialization circuit 312 consisting of a resistor R1, a capacitor c1, and an inverter circuit 11+I.

At the same time, the set output Q of the first flip-flop circuit 313 is supplied to the second
The flip-flop circuit 316 is also set.

As a result, each set output Q of the first and second flip-flop circuits 313 and 315 is connected to the control circuit 20 via the two-person circuit 316, which is supplied to each input terminal.
A first music search control signal is supplied to the first music search circuit 317 provided in the first music program. As a result, as described above, the control circuit 201 sends a signal necessary for searching for the first track to the disc 1 generation system 202 via the external control circuit 203. The first song search operation state is entered.

Then, when the first song is searched (this is achieved by detecting the address [O1] corresponding to the beginning of the first song), the search end detection circuit 318 provided in the control circuit 201 A search end detection signal is now output. As a result, the search end detection signal and the set output Q of the second 7-lip frog circuit 3150 are supplied to each input terminal of the two-person circuit 319, and the output of the AND route 319 is supplied to one input terminal of the two-person circuit. By supplying a pause control signal to the pause signal input circuit 321 provided in the control circuit 201 via the ff-t 320, the beginning of the first song is searched for when the power is turned on to enter a pause state. Initialization is completed.

In addition, in this case, the search end detection signal is detected by the counter 32.
2 and opens its dart, resulting in the oscillator circuit 323
The oscillation output of a predetermined period is read into the counter 322. This causes the counter 322
When it counts the reset time (approximately 10 seconds), it outputs a carry signal to reset itself, and also supplies a Radeon light source off control signal to the Radeon off control circuit 324 provided in the control circuit 201. , the laser light source of the pickup 207 is turned off via the external control circuit 203.

However, for the counter 322! If a desired control operation such as play or search is performed using other keys, which are not shown in FIG. 3 for simplicity of explanation, within the reset time period, the system will shift to the predetermined operating state according to the operation command. In this case, the laser light source of the pickup 207 is not turned off.

Then, the search completion detection signal is sent to the first and second free-lag frog circuits 313 and 31 via a delay circuit 325 that ensures that the above-described pause state is reliably obtained.
It is used to clear (reset) 5.

Note that the pause switch 326 (12 in Figs.
(equivalent to 0), if you turn on Ingetae 3,
or dart 314, second free lag frog circuit 315
, two-person controller 32'l and orgate 320
A pause signal in the control circuit 201 via the hexagonal circuit 321
A pause control signal is supplied to the pause state.

That is, as described above, when the power is turned on, the pickup searches for the beginning of the first track on the disc and initializes it to the pause state, so the user can perform the desired play, search, etc. The advantage is that control operations can be performed quickly.
It can be said that it has such advanced control functions that it can contribute to improving operability.

In addition, if no operation command is issued within a certain period of time after initialization when the power is turned on, the radar light source of the pickup will be turned off while the pause state at the beginning of the first song is maintained. Therefore, it can contribute to extending the life of the Rade light source and also has the effect of preventing wasteful power consumption.

It goes without saying that the present invention is not limited to the embodiments described above and illustrated, and that various modifications and applications can be made without departing from the gist of the invention.

〔Effect of the invention〕

Therefore, as detailed above, according to the present invention, it is possible to improve a disc record playback device that plays back a disc containing digitized data in such a way that it can reliably perform advanced control functions with a simple configuration. death,
Therefore, it is possible to provide an extremely good disc record playback device that contributes to improved operability.

[Brief explanation of drawings]

1 and 2 are a front external view showing a CD type DAD playback device to which the disc record playback device according to the present invention is applied, and a block configuration diagram showing its electric circuit system, and FIG. 3 is a block diagram showing an electric circuit system thereof. FIG. 2 is a block configuration diagram of main parts showing an embodiment. 110... Cabinet, 111... Disk loading section, 112... Eject key, 113... Volume work key, 114... Display section, 115... Repeat key, 1.16... First forward key, 117
...Greykey, 118...Next Greykey,
119...Repeat key, 120...Pause key,
121...Stop key, 122-131...Numeric key, 132...Memory read key, 133...Memory key, 134...Clear, 114a...Eject indicator, 114b...Search Display, 114C
...Error indicator, 114d...Repeat indicator,
114e°°autoplay display, 114f...
Memory indicator, 114g...Memory indicator, 1
14h...Track number display, 1141...Time display,
114j...Manual display, 114k...Play display, 1141...Pause display, 201...
Control circuit, 202... Disc playback system, 203...
External control circuit, 204... disk motor, 205...
...Pickup feed motor, 206...Disk,
207... Pickup, 208... RF signal detection circuit, 209... Servo circuit, 210... Demodulation circuit, 211... Address detector, 212... D/A converter, 213 ...RAM. 214...ROM...? J5... Display output control circuit, 216... Speaker, 311... Power switch, 312... Initialization circuit, 313.315.
...Frig Frog! Circuit, 314, 320... or dirt, 316, 319, 327... and gate,
I! + "2, I3...Inverter, 31
7... First song search circuit, 318... Search end detection circuit, 321... Pause signal input circuit, 322...
... Counter, 323 ... Oscillation circuit, 324 ... Radeon off control circuit, 325 ... Delay circuit, 326
...Pause switch.

Claims (1)

[Claims] In a disc record playback device that optically plays back a disc record in which data to be reproduced and its address data have both been digitized and recorded, when the power is turned on, a pickup that plays back the disc record records data in the data to be reproduced. a first means for searching the head portion of the first data to be reproduced and initializing it to a pause state; and in response to the first means, a predetermined operation command is not issued within a certain period of time after the initialization. and second means for turning off the radar light source of the pickup when the pickup is in the OFF state.