JPH03116472A - Disk record reproducing device - Google Patents

Abstract

PURPOSE:To obtain a disk record reproducing device with high-performance functions by utilizing the recording linear velocity of the data of a disk record or a value relating to the linear velocity. CONSTITUTION:The table of correspondence between address performance time and the radius diameters of disk records which is stored in a ROM 214 is corrected with the actual linear velocity. For example, when an up UP key 135 is operated in manual play mode, searching operation which uses the address of the start part of next music as a target address is performed. A pickup 207 is moved in a radial direction of the disk record and data relating to the radial distance of the movement is read out of the table according to the current address to correct the distance with the actual linear velocity. Consequently, the accuracy of the searching operation is improved to make a fast search and higher performance of the device is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to, for example, a CD (engineering compact disc) type disc record reproducing apparatus.

(Prior Art) Recently, in the field of audio equipment, a digital recording and reproducing method using PCM (pulse code modulation) technology is being adopted in order to achieve high fidelity reproduction as much as possible.

In other words, 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, the system that targets recording media and disks (discs) 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 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,
Diameter: 12 cm II: 11: Thickness: 1.2 A disk made of a transparent resin disk coated with a metal thin film that forms pits (irregularities with different reflectances) corresponding to digital PCM data is processed using the CLV (constant linear velocity) method to approx. 500~20Or
, p, m, and reproduced in a linear tracking manner from the inner circumferential side to the outer circumferential side using an engineering pickup incorporating a semiconductor laser and a photoelectric conversion element. The track pitch of this disc is 1.6 μm, and the program area (
A table of contents (T.

C) Data is digitized and recorded in the lead-in area (radius 23 to 25 degrees).

Since the amount of recorded information on the disc is enormous, disc record playback devices for such discs require high-speed fast-forward and fast-reverse operations in order to easily and selectively play back desired non-playback data. It is equipped with a sending function and a search function to automatically search for a desired address. Further, some disc record playback devices are provided with a memory function that can store desired information in order to be able to search for the address of the data to be played back in a timely manner, in addition to the search function.

Various methods have been considered to improve the performance of such disc record playback devices. For example, attempts have been made to improve the pickup feed motor in order to perform the search operation at high speed, and to improve the circuitry necessary for the search operation. Additionally, new circuits are being developed to speed up the pull-in of the CLV control system and to display the pickup position more accurately. However, at present, the various functions of disc record playback devices are not yet high-speed and highly accurate. Even higher performance is desired.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a disc record playback device that has higher performance functions that the disc record playback device has.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above-mentioned object, the disc record playback device of the present invention has a disc record playback device in which a plurality of pieces of data to be played and their address data are both digitized, In a disc record reproducing apparatus for reproducing a disc record recorded at a constant linear velocity using a pickup that reads these data, means for obtaining a recording linear velocity of data on the disc record or a value related to the recording linear velocity; The method is characterized by comprising means for utilizing the recording linear velocity obtained by the means or a value related to the recording linear velocity.

(Function) In the device configured in this way, the recording linear velocity of each disc record played by this playback device or a value related thereto is obtained, and various functions are made faster and more precise. A higher performance disc record playback device can be obtained.

(Embodiment) An embodiment of a CD type disc record reproducing apparatus to which the present invention is applied will be described with reference to the drawings.

First, the outline of the disc record reproducing apparatus in this embodiment will be explained based on FIGS. 2 and 3.

Fig. 2 shows a front external view of the disc record playback device, and a horizontal loading type disc loading section (111) that can be opened and closed is formed on the left side of the center front of the cabinet (110). .

On the lower right side of this disc loading section (111) is an oven/close (0PEN/CLOSE) for opening and closing the disc loading section.
There is a CLO8E) key (112), and on the left side of the disk loading section (ill) there is a power supply (POνE
R) key (113) is provided.

In addition, on the right side of the central part of the entire surface of the cabinet (110), there is a display section (114) for making various displays described later, and further on the right end there is a PLAY button for playing operations.
key (115) and pause (PAUSE) for pause operation.
) key (11B) is provided. The front lower part of the cabinet (110) is 0°1.2...
・, 9 number keys (117) to (12B), MEMORY key (127), memory read (M
-READ) key (128), clear (CLEAR)
key (129), time key (130)
, REPEAT key (131), Reverse (REV) key (132), Fast forward (FF) key (133), DOWN key (134), 7 UP key (135), Auto A pause (AUTOPAUSE) key (13B) and a stop (5TOP) key (137) are provided.

In addition, the above-mentioned display section (114) has a data (DATA) display (114a) and a disk (DIS) at its left end.
C) Display (114b), stop (5TOP) display (1148), pause (PAUSE) display (114)
d), a play (PLAY) display (<114e) and a memory play (M-PLAY) display (114r) are provided, and the right end is equipped with an auto-pause (A-PAUSE) display (
114g), total time (T-TIME) indicator (
114h), remaining time (R-TIME) indicator (l141) and repeat (REPEAT) indicator (
114j) is provided. Also in the center is 16
Channel memory indicator (MEMORY-IM)
DICATOR) (114k), song number (Music N
o) Display (114+) and time (TIME) display (
114m), and a pickup position indicator (114n) is provided to the lower left end thereof.

FIG. 3 shows the electric circuit system of the CD type disc record reproducing apparatus shown in FIG. That is, by selectively operating each of the aforementioned keys (112) to (137), the disc playback system (202) is controlled to a predetermined level via a control circuit (201) comprising a microcomputer, an interface circuit, etc. In addition to controlling the state, the above-mentioned display section (114) displays the necessary information.

In the figure, a disc playback system (202) is connected to a disc motor (2) via an external control circuit (203) from a control circuit (201).
04) and the pickup feed motor (205) are driven, the data recorded on the disk (20B) is reproduced by the pickup (207), and the reproduced signal is sent to the RF signal detection circuit (208). This RF signal detection circuit (20g) sends the reproduced signal to the servo circuit (209).
and a signal supplied to the demodulation circuit (210).

Here, the servo circuit (209) is connected to the pickup (207).
) performs focus and tracking servo, and also sends out various signals to perform linear tracking servo to the pickup feed motor (205).

Further, the demodulation circuit (210) separates a synchronization signal for address detection from the reproduced signal, supplies this synchronization signal to the address detector (211), and performs EFM demodulation of the reproduced signal from which the synchronization signal has been separated. It is supplied to the D/A converter (212). Here, the address signal detected by the address detector (211) is transmitted to the control circuit (211) in the case of Table of Contents (TOC) data in the lead-in area.
1) is loaded into the RAM (213) and used to perform necessary control functions, and is used to store program area address data (track number, elapsed time, etc.).
If so, it is used to make necessary displays via the control circuit (201). 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, etc. processing before driving the speaker (21B) to produce sound. It will be offered to

Note that the ROM (214) in the figure is for driving the control circuit (201) with a predetermined program, and the display section (114) is for transmitting various signals for display to the control circuit (201).
) is supplied via the display output control circuit (215) and driven to a predetermined state.

Next, each key (11
2), (115) to (137) and display section (114)
) functions are explained.

Oven/Close (0PEN/CLO8E key)
112) > Operating this key during playback cancels the playback state, and the control circuit (201) and external control circuit (203)
), the disk motor (204) is stopped, the laser diode is turned off, and the pickup (207) returns to the starting position, after which the disk loading section (111) is opened. Also, if you operate this key while the disc loading section (111) is open, the disc loading section (111) will open.
11) is closed.

PLAY key (115) > This key is used both when used alone and when reading memory (M-READ).
key (12g) or number (0-9) key (117)
There are cases where the operation is performed subsequent to the operations in (12B).

First, when used alone, as a manual play mode, if the state immediately before operating this key is a pause state, which will be described later, the pause state is canceled and the disc motor (204), pickup feed motor (205), and The pickup (207) is activated and enters the play state. However, if the state immediately before operating this key is a play state in the memory play mode, which will be described later, the mode shifts to the manual play mode after the performance of the song is finished.

Furthermore, search (RAM address related to the specified song number)
(search based on the TOC data imported into (213) and move the pickup (207) to the position where the beginning of the song is to be found). being done.

And memory read (M-READ) key (128)
Alternatively, when used in conjunction with the number (0-9) keys (117)-(126), the search operation state is entered, and after the search is completed, the play state is entered.

<Bose (PAUSE) key (ll[i)> This key is also used when used alone and for memory read (M-READ).
) key (128) or number (0-9) key (117
) to (126) may be followed by the operations.

First, when used alone, if the state immediately before operating this key is the play state, the play state is canceled, the pickup feed motor (205) is stopped, and the pause state is entered. Also, if the operation is performed during search operation,
After the search is completed, it enters a pause state.

And memory read (M-READ) key (12g)
Alternatively, when used in conjunction with the number (0-9) keys (117) to (12B), the search operation state is entered, and after the search is completed, the pause state is entered.

Numerical (0-9) keys (117)-(126) >By operating these keys, each key will change to the disk (20
B) The song number (MUSICN) of the data to be played recorded in
O) That is, the playback song is specified in correspondence with the track number (TNO) and the index number (X) in one song (ITNO). In addition, the memory (MEMORY) key (1
27) is used in combination to write numerical key data to the memory channel.

MEMORY key (127) > Numeric keys (0 to 9) mentioned above (117) to (12B) or the DOWN key (H4) and UP (U
If you press this key after operating the P) key (135),
The specified track number is stored as data in the memory channel (1) of the control circuit (201) and RAM (213).
~16) are written in order from the lowest available channel number.

Memory read (M-READ) key (128) >Press this key several times to move the channel displayed on the memory indicator (114k) and read out the contents of the previously written memory channel specified there. Then, by pressing the PLAY key (115),
After performing a search operation and completing the search, the device enters memory play mode and plays sequentially according to the memory channels. Also, when changing the contents of a memory channel, use this key to call up the memory channel you want to change and use the memory indicator (l1
While 4k) is flashing, press the number (0-9) keys (117
) to (12B) and then the MEMORY key (127) changes the contents of the memory channel.

CLEAR key (129) > Numbers (0~
9) If keys (117) to (128) are operated by mistake, pressing this key cancels the data and displays the original song number on the song number (MtlSICNo) display (114+). Note that memory read (M-REA)
When the D) key (1211) and this key are operated at the same time, a memory all clear operation state is established.

Time (TIME) key (130) >Each time this key is operated, the time displayed on the time display (l14m) changes from the elapsed time of one song (normal display) to the elapsed time of all songs, and then to the remaining time of all songs. It is done like this.

REPEAT key (131) >Each time this key is operated, repeat (repeated playback) of all songs or all memory channels is turned on or off.

Rev. 7, (REV) key (132) >While this key is pressed, the pickup (207) is moved toward the inner circumference in the disk radial direction at high speed by the pickup feed motor (205) to perform a quick return operation.

Fast forward (F F) key (133) > While this key is pressed, the pickup feed motor (20
5), the pickup (207) is moved toward the outer circumference in the radial direction of the disk at high speed to perform a fast forwarding operation.

DOWN key (134) > When this key is operated in manual play mode, a search operation is performed using the start address of the currently playing song as the target address, and the search is resumed after the search is completed. Return to previous mode.

Also, when this key is operated in memory play mode, a search operation is performed using the address of the memory play start part corresponding to the memory channel contents (track number) currently being played as the target address, and the search is performed again after the search is completed. Return to previous mode.

Furthermore, if this key is operated during the search operation, in manual play mode, the start of the song that has the TNO immediately before the search target TNO displayed on the song number (MU, SICNO) display (1141). A search operation is performed using the address as the target address, and if it is in memory play mode, the music number (MUSIC No.) display (11
41) A search operation is performed for the track number currently displayed, that is, the contents of the search target memory channel, with the address of the memory performance start portion corresponding to the previous memory channel contents as the target address. .

Up (UP) key <135) > When this key is operated in manual play mode, a search operation is performed using the start address of the next song as the target address, and after the search is completed, the mode status before the search is returned. become.

Also, when this key is operated in memory play mode, a search operation is performed using the address of the memory play start part corresponding to the next memory channel contents as the target address, and after the search is completed, the mode returns to the state before the search. .

Furthermore, when this key is operated during the search operation, in contrast to the case of the DOWN key (134) described above,
In manual play mode, a search operation is performed that uses the address of the start part of the song that has the next TNO for the search target TNO as the target address, and in memory array mode, the search operation is performed using the address of the start part of the song that has the next TNO as the target address, and in the memory array mode, the search operation is performed using the address of the start part of the song that has the next TNO as the target address. A search operation is performed using the address of the memory performance start portion corresponding to the content as the target address.

AUTOPAUSE key (13B)
>Each time this key is operated, auto-pause (automatically enters a pause state after one song is played) is turned on and off.

STOP key (137) > Operating this key cancels the play state and stops the disc motor (204), pickup feed motor (205), and pickup (207) after searching for the first song. It has become.

DATA indicator (114a) > Flashes when the pickup (207') is reading TOC data recorded in the lead-in area of the disc,
It is designed to light up when all C data is read normally.

Disc display (l14b) >Oven/close (0PEN/CLO8E) key (11)
After 2) is operated, it flashes when the disk loading section (111) is opening and closing. Also, when the disc loading section (111) is open, the light goes out and the disc loading section (111) is open.
ill) is closed and a disk (208) is loaded.

The STOP indicator (114c) is turned on when the STOP indicator (114c) is in the STOP state.

The PAUSE indicator (114d) lights up when the PAUSE state is greater than the PAUSE state.

The PLAY indicator (114e) lights up when the play mode is selected.

Memory play (M-PLAY) display (114(')
>It lights up when in memory play mode.

Autobose (A-PAUSE) indicator (114g)
>It is designed to light up when the autobose function is on.

Total time (T-TIME) indicator (l14h)
>The time (TIME) indicator (114111) is designed to light up when the time displayed on it is the elapsed time for all songs.

Remaining time (R-TIME) indicator (114
i)> Time (TIME) The time indicator lights up when the time displayed on the display is the total remaining time of the song.

REPEAT indicator (l14j)> This indicator lights up when the repeat function is on.

MEMORY INDICATOR (l14k)>
It has 16 channels, and the portions corresponding to all written memory channels are lit. Also, in memory play mode, the part corresponding to the memory channel being played flashes. Furthermore, even during a memory write or read operation, the portion corresponding to the memory channel in operation blinks.

Music number (MUSIC No.) display (1141) and time (TIME) display (114III) These are 8-digit numerical displays in total, and are collectively referred to as an address display section. In other words, each two digits from the left side are TNO (
track number), X (index number), MI
It represents N (minutes) and 5EC (seconds). Here MI
N, SEC changes the elapsed time of one song according to the operation of the TIME key (130) (00 minutes each time the TNO changes).
(starting from 0 seconds), the elapsed time of all songs, and the remaining time of all songs. In addition, a disk loading section (111)
When it is open, all lights are off, and when it is in playback mode, all lights are on to display the address being played.

When the number (0 to 9) keys (117) to (12B) or the memory read (M-READ) key (128) are operated, only TNO and X are displayed and MIN is displayed.

SEC lights out. Also, TNO during search operation.

The X blinks and the MIN and SEC lights go out.

<Pickup position indicator (114n)> Displays the current playing position of the pickup (207) with respect to the disk (20[i). The part corresponding to the elapsed time of all songs lights up from the left side, and the part corresponding to the remaining time of all songs lights up. Parts are now turned off.

Next, the program written in the ROM (214) is shown in a flowchart as shown in FIG.

When the program starts, the microcomputer in the control circuit (201) connects the interface and search function circuit in this control circuit, the external control circuit (203),
Pickup feed motor (205), RF detection circuit (
208), servo circuit (209), demodulation circuit (21)
0) RO is detected in advance by the address detection circuit (211)
A pickup (207) is caused to search for a predetermined address (T1) stored in M (214). The micro combinator moves the pickup N tracks ahead via the interface and external control circuit (203) (step 2). Here, N is a positive integer of N≧1. Radial travel of this pickup (number of trucks)
This can be easily done, for example, by counting changes in the output signal of the RF detection circuit. The arrival address (T2) that the pickup actually reached can be read from the address detection circuit (211), and is read out from the RAM (213) via the interface and microcomputer.
(step ■). ROM (2) in advance
14), a predetermined address (T1), a scheduled address (T), a predetermined linear velocity (VT), and a RAM (213) stored in the RAM (213).
) is used to calculate the actual linear velocity of the disk record (VD
) (step ■).

Here, this equation 0 will be explained.

Generally, the reference position on the disc record (address TX)
The number of tracks N between and any position (address T y )
is expressed by the following equation.

The reference position (address T
There is a position. Here, the area on the disk record whose radius is from the center of the disk record to the address (TY) is 81 The area on the disk record whose radius is from the center to the address (TX) is S Subtract the area S1 from the area S 1 Let the area of the part be 82.

5-81+82 yr-(tpN+ri) 2-yrri 2+VT(
TY-Tx)t p(tpN+r t) 2-r i2
+ ” (1Y-1'p π Formula 0 is derived from the above.

Here, the current position of the pickup is set as an address (T1), and this position is set as a reference position (radius r). If the pickup is moved N tracks in the direction of the outer circumference of the disc record from this position, the expected address to be reached will be calculated from the above table and will be the address (TT).

Further, if the position actually reached by the pickup after moving is the address (T2), and the actual linear velocity of this disc record is VD, then the following equation is obtained from equation 0.

From equation (2), the relationship of equation 0, vT(TT-T□)-vD(T2-T□), holds true. That is, by finding the ratio of addresses when moving a known number of tracks, the actual linear velocity of the disc record can be obtained.

The reason why the actual linear velocity of the disk record or the ratio of addresses related to the linear velocity, which has been necessary until now, is determined in this way will be explained.

Regarding the linear velocity of recording data to a disk record,
The standard for CDs specifies a speed of 1.2 to 1.4 m/s. The recording linear velocity of commercially available discs is 1.
Although most disks seem to have speeds of 2 m/s, there are also disks with speeds other than 1.2 m/s. This recording linear velocity is determined when the disk record is manufactured, and varies depending on the manufacturing company and manufacturing equipment. If each disc record has a different recording linear velocity, for example, in a disc record playback device whose search function is designed assuming that the standard recording linear velocity is 1.2 m/s, the linear velocity is 1.2 m/s. It has been found that when playing disc records other than S, it is not possible to reduce the search time below a certain level even with other design efforts. This is because the number of times the pickup moves in the radial direction (track jump, track kick) from the start of the search until the search for the target address increases due to the difference in linear velocity, which takes time.

Therefore, by determining the actual linear velocity or a value related to the linear velocity of the disc record currently being played, it is possible to achieve faster and more accurate search operations, which was impossible until now.
They believed that it would be possible to achieve high-speed pull-in of the V-control system and improve the accuracy of pickup position display.

Now, the actual linear velocity of the disc record obtained by this embodiment is used, for example, to increase the speed and accuracy of the search operation. The table of address (performance time) versus radial distance of the disk record stored in the ROM (214) is corrected using this actual linear velocity (step 2). For example, when in manual play mode,
When the P) key (135) is operated, a search operation is performed using the address of the start portion of the next song as the target address. The pickup (207) is moved in the radial direction of the disc record, and data regarding the radial distance to be moved is read from the table based on the current address. This distance is corrected by the actual linear velocity. That is, when the actual linear velocity is large (for example, 1.
35 m/s), this distance is increased; if the actual linear velocity is small (for example, 1.20 m/s), the pickup (207) is corrected to be smaller. By doing so, the accuracy of the search operation can be improved and high-speed search can be realized.

Furthermore, the actual linear velocity of the disc record obtained here can be used to speed up the pull-in of the CLV control system and to display the position of the pickup.

Furthermore, as stated in the specification of Japanese Patent Application No. 58-157759, which is the original application, the actual linear velocity is obtained by determining the ratio of addresses (performance times). It goes without saying that the same effect can be achieved by using this ratio.

As explained above, in the embodiment of the present invention, a microcomputer is used in the control circuit, but each configuration is only hardware (
It is obvious that this method can be realized (without using a microcomputer). Furthermore, when the present invention is realized using a microcomputer, the flowchart is not limited to that shown in FIG. 1, and the software may be assembled so that there is a means for realizing functions corresponding to each requirement of the claims. , the flowchart can also be modified in various ways.

[Effects of the Invention] As described above in detail, according to the present invention, with a simple configuration, various functions of a disc record playback device can be made faster and more accurate, and higher performance can be obtained.

(Ichigoji)

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the operation of an embodiment of the present invention, FIG. 2 is a front external view showing an embodiment of a disc record playback device according to the invention, and FIG. 3 is a diagram of the disc record shown in FIG. 2. FIG. 2 is a block configuration diagram showing an electric circuit system of the playback device. 201 ...... Control circuit 202 ...
・・・・・・ Disc playback system 205 ・・・・・・・・・
・・Pickup feed motor 207 ・・・・・・・
...Pickup 209 ...... Servo circuit 211 ...... Address detection circuit 213 ...... RAM 214 ...... ROM Figure 1

Claims (1)

[Claims] In a disc record reproducing apparatus that reproduces a disc record in which a plurality of non-reproducing data and their address data are both digitized and recorded at a constant linear velocity using a pickup that reads these data, A disk record characterized by having means for obtaining a recording linear velocity of data or a value related to the recording linear velocity, and a means for utilizing the recording linear velocity or a value related to the recording linear velocity obtained by this means. playback device.