JPS5940374A - Disk record reproducer - Google Patents

Abstract

PURPOSE:To ensure a highly efficient control function, by providing the 1st means to detect the state of reproduction of the final data and searching the head part of the first data when the detection output is operated in a certain state to set a reproduction mode from the head part of the first data. CONSTITUTION:When the final music on a disk is played, a final music play mode detecting circuit 313 provided in a control circuit 201 detects the play of the final music based on an address detection data and then delivers a detecting signal of a high level. Under such conditions, a next play switch 311 is operated to reset the head part of the first music for reproduction. Thus the 2nd flip-flop circuit 315 is set via a double input AND gate 312, and a search control signal for head of the first music is supplied to the input terminal of the 1st music head searching circuit 318 to proceed to a reproduction mode from the head of the first music.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a CD (optical compact disc).
The present invention relates to a disc record playback device suitable for a digital audio disc (DAD) system, and particularly to a control system thereof.

[Technical background of the invention and its problems]

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

First, this is what is called digital audio, and the audio characteristics do not depend on the characteristics of the recording medium and are much superior to those using conventional analog recording and playback methods. This is because it is established in principle.

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

Well, if you look at the CD format,
CLV (Constant Linear Velocity) ) Approximately 500 to 2 depending on the method
It is driven to rotate at variable rotational speeds of 00r, p, and m, and is reproduced in a linear tracking manner from the inner circumference side to the outer circumference side using an optical pickup containing a semiconductor laser and a photoelectric conversion element. The disc has a track pitch of 1.6 μm, and a huge amount of information that can be played in stereo for about 1 hour on one side is recorded in the program area (radius 25 to 58 wn) in digitized form along with address data. , their maximum and minimum song number data, etc. are in the lead-in area (radius 23 to 25
This can easily be seen from the fact that it has been digitized and recorded in the WS.

However, since conventionally known disk record playback devices of this type have not yet been realized with excellent operability and display performance to satisfy the advanced control functions, there is an urgent need to This was seen as 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 is improved so as to be able to reliably perform advanced control functions with a simple configuration, thereby contributing to improved operability.

[Summary of the invention]

That is, in a playback device for a disc record in which a plurality of pieces of data to be reproduced and their address data are both digitized and recorded, the first step is to detect that the last data among the plurality of pieces of data to be reproduced is being reproduced. 1
and a means for searching for the head part of the first data among the plurality of data to be reproduced and reproducing from the head part of the first data by being operated with the detection output from the first means. The present invention is characterized by comprising a second means for causing the state to shift to the state.

[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 cabit 110 so as to be openable and closable. and,
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 POR key 113 for connecting and disconnecting the power supply.

Further, on the upper right side of the disk loading section 111, 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 116 and the play (PL) key 116 for play operation.
AY ) key 117 is provided. Similarly, in the middle row is NEXT PLAY, which will be described later.
A key 118, a REPEAT key 119, a PAUSE key 120, and a s'rOP key 721 are provided.Similarly, in the lower row are 0.1.2...9. Numeric keys 122 to 131, a memory read (MREAD) key 132, a memory (MEMORY) key 133, and a clear (CLEAR) key 134 are provided.

Then, the above-mentioned display section 114 displays the eject (EJEC)
T) Display 114as search (5EARCH) display 114b, error (ERROR) display 114e,
REPEAT indicator 114d.

Manual (MANUAL) display 114j, auto play (AUTO) display 114es Memory (ME
MORY) Display 114f and 8 channel memory indicator (MEMORY INDICATOR)
114g and song number (MUSIC No.) display 114h
and a time (TIME) indicator 114I.

In addition, the PLAY key 117 and the pause (
During the PAUSE ) key 120, you can also press the PLAY button.
AY) and pause (PAUSE) on the display 114.

A display 114t is provided.

FIG. 2 shows the electric circuit system of the CD type DAD generator shown in FIG.
134, the disk reproducing thread 202 is controlled to a predetermined state via the control circuit 201 comprising a microcomputer, an interface circuit, etc., and the necessary information is displayed using the display section 114 described above. It is a display.

That is, when the disc motor 204 and the Birafatsuji feed motor 205 are driven from the control circuit 201 via the external control circuit 203, the data recorded on the disc 206 is reproduced by the pickup 207, and the reproduction signal is transmitted to the disc reproduction thread 202. The RF signal detection circuit 20
Send on 8th. This RF signal detection circuit 208 separates the reproduced signal into a signal to be supplied to a servo circuit 209 and a signal to be supplied to a demodulation circuit 210.

Here, the servo circuit 209 provides focus servo and tracking servo to the pickup 207. At the same time, various signals are sent to the pickup sending motor 205 to make a linear tracking signal ν2.

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 n raw signal from which the synchronizing signal has been separated is demodulated (EFIVI) and supplied to the D/A converter 212.

The address signal detected by the address detector 21 is taken into the power W213 via the input circuit 201, and is used to perform the necessary control function.

In addition, the reproduced data returned to an analog signal by the D/A converter 212 is subjected to necessary error correction, deinterleaving, error correction, and other processing before being used to drive the speaker 216 to produce sound. It turns out.

In FIG. 2, 214 is a ROM for driving the control circuit 201 with a predetermined program.

215 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 described above.
2, 115 to 134 and the functions of the display section 114 will be explained.

[Numeric keys (O-9) keys 122-13] These are keys for manual numeric input, and are used when specifying a song to be played when searching for the beginning of a song and when inputting one into the memory.

[MEMORY key 133] Numeric key is used when writing data to the memory rechannel.

[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.

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

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

[REPEAT]
Keys - 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
READ) key 132 or number (0-9) key 1
There are cases where operation 8 is performed subsequent to operations 22 to 131.

First, when used alone, it is set as a manual play mode, and if the state in front of which this key is operated 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 operating the key was in the play state in the auto play mode (described later), the key will shift to manual play mode, and if the key is operated during a search operation, the play state will change 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, the search operation state is set to auto play mode, and the play state is entered after the search is completed. ing.

Please note that an error (gR
If the ROR display 114c is blinking, this key has the same operation as the 6 CLEAR key 134.

[PAUSE key 12o] This key may also be used alone, or may be operated following the operation of the memory read (M READ) key 132 or number (0 to 9) keys 122 to 131. .

First, when used alone, if the state immediately before operating this key is the play state, the play state is canceled and the pause state is entered. Furthermore, if the operation is performed during a search operation, the pause state is returned after the search is completed.

When used in combination with the memory read (MREAD) key 132 or the numeric (0-9) keys 122-13, 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
] When this key is operated in the manual play mode, a search operation is performed to find the next song (actually the next TNO track number) at the 00 address.

Further, when this key is operated in the auto play 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, a search operation will be performed with the target address as the next TNO of It'j,, H indicated TN□ in manual play mode.
In addition, in the auto play mode, a search operation is performed using the contents of the memory channel next to the display memory channel as the target address.

Note that this key operation does not cause a transition between the play/pause state.

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

In addition, if you operate this key in auto play mode,
A forward operation is performed during the operation, but if the position at which the operation is stopped deviates from the song being played, a search operation for the next memory channel is performed.

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

Please note that if you perform a packed word operation in auto play mode, the stop position may deviate from the currently playing song.
, a search operation is performed for the previous memory channel.

[Stop (5TOP) key 121] When this key is operated, the mode shifts to manual play mode, and after the first song search is performed, the 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.

[Iji! (EJECT) key 1125 If you operate this key during playback, the playback status will be canceled.The disk motor will stop, the laser diode will turn off, and the disk will start running about 1 second after the Birafatsuji returns to the starting position. The loading section 11 is configured to open.

- When operating each key mentioned above, a so-called CHI RP sound (approximately 3.5 k
Hz″r for 0.072 seconds) is generated.

[EJECT indicator z14a:l] After the EJECT key 112 is operated,
The light blinks at a frequency of about 3 Hz until the picker 7'' returns to the starting position, turns on when the disk loading section 111 is opened, and turns off when the disk loading section 11 closes.

[Serf (5EARCH) Display 114 b] When all the TOC (Table Off Content) data in the lead-in area recorded as index data on the disc has been read normally, and the search for the first song has been completed. It is designed to light up.

[Error (ERROR) indicator 114c] When an error (described later) occurs, it lights up for about 0.67 seconds and blinks at a frequency of about IHz for about 0.33 seconds, but it starts blinking. The light goes out when about 10 seconds have elapsed from the hour or when the CLEAR key 134 is operated.

And, what is the error state? ■ When about 20 seconds have passed since the disc was set upside down ■ Number (O to 9) keys 122 to 1, ? If a search operation is commanded by l, but the specified TNO does not exist on the disk ■Memory read (M READ) key 132 or 1
Next play (NEXT) when in iJ-tray mode
If a search operation is commanded by operating the PLAY ) key 118, but the TNO of the specified memory channel contents does not exist on the disk. If it is determined that it does not exist ■ If the search operation is completed even after 20 seconds have passed after the start of the search operation and it is not strong ■ This is Yang Han, etc. who tried to capture TNO 200 as memory channel data.

[REPEAT] Display 114 d This indicator lights up when the repeat function is on.

[MANUAL display 114j] Lights up when in manual mode or innoet mode, and blinks while reading the lead-in area (approximately 3 Hz).
8th period) It's like that.

[Auto play (AUTO) 5 indicator 114e] It is designed to light up in the auto play mode.

[MEMORY display 114t] 1 character (0
~9) When the keys 122 to 131 are operated, the light is turned on when memory 1 can be written, and the light is turned off after about 10 seconds or when a key other than the numeric keys is operated.

[MEMORY INDICAT
OR) 114g] In this case, the portion corresponding to the memory channel that has 8 channels and is written in is lit in all states.

Further, in auto play mode 2, a portion corresponding to the memory channel being played back flashes (at a frequency of about 3 Hz).

When number keys 122 to 131 (0 to 9) are operated, the part corresponding to the lowest numbered memory channel that can be accessed will blink (approximately 3
Hz period).

Further, when the memory read (M READ) key 133 is operated, a portion corresponding to the memory channel being read out flashes (approximately 3 times (z 8 periods)).

[Track number (WfUSICNo) display 114h and time (TIME) display 1141] These are composed of a total of 8-digit numerical displays, and are collectively referred to as an address (data) display section. In other words, two digits each from the left 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.

Also, if you operate the number (0 to 9) keys 122 to 131 or the memory read (M READ) key 133,
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 indicator 114k] Lights up when in play mode.

[PAUSE indicator xx4t] Lights up during the pause mode.

Next, an embodiment of the present invention based on the above-mentioned outline will be described. In this invention, the playback is configured such that during the playback of the last song, the playback can be returned to the beginning of the first song with a single touch. .

In other words, as shown in FIG. 3, in which the same reference numerals are given to the same parts as in FIG. 2, the next play switch 311 (corresponding to 118 in FIGS. 1 and 2) has one end It is grounded and the other end is connected to the power supply (Vc) through the resistor (R1).
c) and to one end of the two-man power AND boot 3120 input via an inverter (11)e.

The other end of this two-person controller 312 is connected to the output end of the last song playing detecting circuit 313 provided in the control circuit 201 described above.
14 set input terminals (S), and its output terminal is connected to the set input terminal (S) of the second flip-flop circuit 315. f70 tube circuit 314
．． 315 is the beginning of the first song whose respective positive phase output terminals (Q) are connected correspondingly to the respective input terminals of the two-person driver circuit 316, and whose reset input terminals (R) are provided in the control circuit 201. It is commonly connected to the output terminal of the search end detection circuit 317.

Also, the second 7-rip frog circuit 315.

The inverting output terminal (Q) is connected to the play control signal input terminal (Tl) of the control circuit 201.

The output end of the two-player track 316 is connected to the input end of a first song beginning search circuit 318 provided within the control circuit 20.

In FIG. 3, the switches corresponding to the operation keys other than the next play switch are not shown for the purpose of simplifying the explanation, but it is assumed that they are actually provided in the same way as those in FIG. 2.

In the above configuration, if the last song on the disc is currently being played, the last song being played detection circuit 313 provided in the control circuit 201 detects this based on address detection data. and outputs a HIGH level detection signal.

In this state, if the next play switch 311 is operated to return to the beginning of the first song and play it, the second frig 70 tube circuit 31
5 is set.

Then, before this, the first frizzo-frozzo circuit,
? Since l 4 is set, AND gate 31
6 into the control circuit 201, and the first music beginning search control signal is supplied to the input terminal of the fc first music beginning search circuit 318.

As a result, as described above, the control circuit 201 transmits the signal necessary for searching the beginning of the first track to the disc playback thread 202 via the external control circuit 203, thereby causing the pickup 207f to perform the backward operation. A state is entered in which the beginning of the first song on the disc 206 is searched.

When the beginning of the first song is searched (this is achieved by detecting the address [01] corresponding to the beginning of the first song), the first The first song start search end detection signal is now output from the song start search end detection circuit 317. Thereby, the first and second frizzo flop circuits, ? 1
4, J15 will be reset, but the second
The HIGH level signal from the inverting output terminal (Q) of the 7 lip-flop circuit 315 is supplied as a play control signal to the play control signal input terminal (TI) of the control circuit 20, and as a result, the playback state starts from the beginning of the first song. It will be migrated.

In other words, by configuring the configuration so that when the last song is being played, the pickup can be returned to the beginning of the first song with a single touch, and the pickup will normally return to the beginning of the first song when the stop operation is performed. Compared to having to operate the game once you return to the game, it has the advantage of saving you time and speeding up the operation, and it is hoped that the highly advanced control function will contribute to improved operability. It can be said that there is.

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 the drawing]

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. It is a block diagram of the main part showing implementation [11'lJ. 110... Cabinet, 111... Disk loading section, 112... Eject key, 113...) working key, 114... Display section, 115... Reverse key, 116... Fast forward key , 117・
... Gray Key, 118... Next Play Key, 1
19...Repeat key, 120...Pause key, 1
21...Stop key % 122-131...Numeric key, 132...Memory read key, 133...Memory key, 134...Clear, 114g...Eject indicator, 114b...Search Display, 114c
...Error indicator, 114d...Repeat indicator・
114e...Auto play display, 114f...
Memory indicator, 114g...Memory indicator, 1
14h...Track number display, 1141...Time display,
114j...manual display, 114k...play display, 114t...pause display, 20no...
Control circuit, 202... Disk reproduction system, 203.
... External control circuit, 204 ... Ice motor, 2
05...Pickup feed motor, 206...Disk, 207...Pickup, 208...RF sign detection circuit, 209...Serve circuit, 210...Demodulation circuit, 211...Address detection Vessel, 212...D
/A converter, 213...RAJvI, 214...R
OM, 215...Display output side leg circuit, 216...
Speaker, 311 -- Next play switch, 31
4.315... Frizzo flop circuit, 313...
Last song playing detection circuit, 312° 316...AND gate, 317... First song beginning search end detection circuit, 3
18... 1st song beginning search circuit, ■! ...Inverter.

Claims (1)

[Claims] In a disc record playback device that plays back a disc record in which a plurality of data to be reproduced and their address data are both digitized and recorded, it is determined that the last data among the plurality of data to be reproduced is being reproduced. a first means for detecting, and a first means for searching for the beginning of the first data among the plurality of data to be reproduced by being operated with a detection output from the first means; 1. A disc record reproducing apparatus comprising: second means for shifting to a partial reproduction state.