JPS6050676A - Disk record reproducer - Google Patents

Abstract

PURPOSE:To detect the actual linear speed by performing operations to obtain the 1st address read out by a pickup, an expected address obtained from the 1st address and the amount of displacement read out of a table and the 2nd address read out next as well as a fixed linear speed. CONSTITUTION:Plural data to be reproduced and address data are digitized and recorded in a disk 206 and then read by a pickup PU207. A program written in an ROM214 is read out by a control circuit 201, and a PU feed motor 205 is actuated. After a shift of the PU, an address TP at the present position is read out by an address detecting circuit 211 as well as a servo circuit 209 via RF detecting circuit 208 and a demodulating circuit 210 and then stored in an RAM213. An expected address which is shifted from the address of the ROM213 by a fixed distance is calculated from a table stored in the ROM214. This calculated address is defined as TT. At the same time, an address TD obtained after a shift is read out. The actual linear speed can be detected through operations carried out with addresses TP, TT and TD and a fixed linear speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to, for example, a CD (optical compact disc) type disc record reproducing apparatus, and particularly relates to measurement of the linear velocity of a disc.

[Technical background of the invention and its problems]

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

tb.This is called digital audio, and 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 system, and various recording and reproducing methods have been proposed, including optical, electrostatic, and mechanical. However, no matter which method is adopted, the playback device that embodies it must be able to satisfy various advanced control functions and performance that are not found in conventional devices. has been done.

In other words, if we take the CD system as an example,
C is a disk made by covering a transparent resin disk with a diameter of 12 cm and a depth of 1.2 mm with a thin metal film that forms bits (irregularities that determine reflectance) corresponding to digital PCM data.
Approximately 500 to 2oor by LV (constant linear velocity) method,
It is driven to rotate at variable rotational speeds of p and m, and reproduced in a linear tracking manner from the inner circumferential side to the outer circumferential side using an optical pickup incorporating a semiconductor laser and a photoelectric conversion element. This disc has a track pitch of 16 μn, and a huge amount of information is recorded in the program area (radius 25 to 58 mm) in the program area (radius 25 to 58 mm), digitized along with address data, allowing for approximately 1 hour of stereo playback on one side. Table-off content (TOC) data indicating the start address of each of these song numbers is digitized and recorded in the lead-in area (radius 23 to 25).

Due to the huge amount of information recorded on the disc, a disc record playback device for a disc such as the It is equipped with a high-speed forwarding function to automatically search for a desired address, as well as a search function to automatically search for a desired address. Further, some of the disc record playback devices 4 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 conjunction with the search function. .

Although the linear velocity of the disc is based on the CLV method, the width (1.2 to 1.4 m/s) is specified in the CD standard specifications, and the disc records currently on the market are recorded at 1.2 m/s. 3) is determined at the time of manufacturing the ISFR record. For normal playback, there is no need to know the actual linear velocity of the disc record, and it is possible to achieve a predetermined CL by controlling the servo using the synchronization signal recorded on the disc record.
Since V control is possible, there is no problem with playback. However, when adding special functions to a disc record playback device, it becomes important to know the actual linear velocity of the disc record. For example, when the actual linear velocity obtained by the present invention is used as a reference to speed up the pull-in of the CLV control system, or when performing a search operation at high speed and with high precision, a table of playing time versus radial distance of a disk record may be used. When used as a correction means, when the pickup is moved at high speed, it can be used as a means for accurately displaying the position of the moving pickup.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a disc record playback device that can detect the actual linear velocity of a disc record with a simple configuration.

[Summary of the invention]

The configuration of the present invention will be explained based on FIG.

The pickup drive signal generating means moves the pickup to the program area of the disc record. Normal focus servo and tracking servo are applied so that the pickup enters a normal playback state at this position, and the first address (TP) at this position is read. From this position, according to the address table of whistle 1, N l-
The planned address (TT) of the rank source is calculated. Here, the pinkup is actually moved N trunks ahead and the second address (TD) of the reached position i;:+1 is read. In the linear velocity calculation means, the first address (Tp), 'd 2
(TI)), planned address (TT), linear velocity (VT) defined by the standard (as intended by the disk record manufacturer), and actual linear velocity (VD) of the disk record. .

[Embodiments of the invention]

Embodiments of a CD type disc record reproducing apparatus to which the present invention is applied will be described with reference to the drawings.

First, an outline of the disc record reproducing apparatus according to the 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 (IIT) is formed on the left side of the center front of the gear pinnen (110,), which can be opened and closed freely. I'm angry.

On the lower right side of this disk loading section (t, 'i i ) is an open/close (O) for opening and closing the disk loading section.
PEN/CLO8E ) key (112) is located on the left side of the disk loading section (111).
An OWER.) key (113) is provided.

In addition, on the right side of the front center of the cabinet (110), there is a display section (114) 6 for making various indications to be described later.
D, and on the far right are PLAY (PLAY) for PU V and I operations.
) key (115) and pause (PAUS) key for pause operation.
E) A key (116) is provided. From the left, O1l, 2
．． ..., 9 number keys (117) to (126), MEMORY key (127), memory read (M-REA, D) key (128), clear (CL)
HA, R) keys (1, 29), time (TIME)
) key (130), repeat (RJPFAT) key (131), reverse (REV) key (132)
,,Fast forward (FF) key (133),
Down (1) OWN ) key (134), Up (U
P) key (135), auto pause (AUTOPAU)
SE) key (136) and stop (Si'OP) key (137) are provided.

In addition, the above-mentioned display section (1, 14) has a data (DA'rA) display (114a), a disk (IMSC) display (114b), and a stop (
5TOP) Display (114C).

PAUSE (PAUS E) indicator (114d), play (PLA, Y) indicator (114e) and memory play (
M-PLAY) display (114f) is provided, and an auto-pause (A-PAUSE) display (114g) is provided at the right end.
, ) - Taltime (T-TI animals) indicator (114h)
, Remaining time (几-TIME) indicator (11
4i) and repeat (REPEAT) indicator (114)
J) is provided. In addition, there is a 16 channel memory indicator (MEMORY-INDI) in the center.
CA'I"0 几) <114k).

Song number (MUSICfsuO) indicator (u4J) and time (
TIME) indicator (h4m) is provided, and a pickup position indicator (114n) is provided from the left end to the right end below it. Figure 3 shows the electric circuit system of the CD type disc record playback device shown in Figure 2. It shows. That is,
By selectively operating each of the keys (112) to (137) described above, the disc playback system (202) is brought into a predetermined state via the control circuit (201) comprising a microcomputer, an intern eight circuit, etc. In addition, the above-mentioned display section (114) displays the necessary information.

In the figure, the disc playback system (202) is the control circuit (:'01)
The disk motor (
204) and the pink-up feed motor (205) are driven, the data recorded on the disk (206) is
The pickup (207) reproduces the signal and sends the reproduced signal to the RF signal detection circuit (208). This RF
The signal detection circuit (208) sends the reproduced signal to the servo circuit (20
9) and a signal supplied to the demodulation circuit (210).

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

In addition, 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 also supplies the synchronization signal to the address detector (211).
The signal-separated reproduction signal is gFM demodulated and supplied to the 1)/A converter (212). Here, the address signal detected by the address detector (211) is taken into J(, AM (213) via the control circuit (201) in the case of table-off content (TOC) data in the lead-in area. It is used to perform necessary control functions, and if it is program area address data (track number, elapsed time, etc.), it is used to make necessary displays via the control circuit (201). The reproduced data returned to an analog signal by the D/A converter (212) is used to drive the speaker (216) to produce sound after being subjected to processing such as error correction, dinterleap, and error correction. You will be forced to do so.

Note that the ROM (214) in the figure is not for driving the control circuit (201) with a predetermined program;
11, 4) is a control circuit (201) for controlling various signals for display.
) is supplied via the display output control circuit (215) and driven to a predetermined state.

Next, each key (1
12) , (115) to (137) and display section (11
The function of 4) will be explained.

<Open/Close (OPEN/CLO8B) key (
112) > If this key is operated during playback, the locked state is released, the disk motor (204) is stopped via the control circuit (201) and the external control circuit (203), and the laser diode is turned off. and pick up (20
7) returns to the starting position, the disc loading section (111)
is designed to open. Also, the disk loading section (ii
If you operate this key while t) is open.

The disk drive unit (111) is closed.

<PLAY key (115)> This key is used both when used alone and when the memory read (M-, READ)
) key (128)'t or number (0-9) key (1
There are cases where the operation is performed subsequent to the operations of 17) to (126).

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 H is released and the disc motor (204) and pickup feed motor are activated. (205) and the pickup (207) are activated to enter 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. To Shiki et al.

Search (address RAAi regarding specified song number (2)
3) Search based on the TOC data imported into 3) and move the pickup (207) to the position where the beginning of the song is to be found) If operated during operation, the play state will be activated after the search is completed. being done.

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

<Pause (PAU, 8B) key (116) > This key also has a function when it is used alone and when it is used for memory read (M-RJ).
! AD) key (128) or number (0-9) key (1
There are cases where the operation is performed subsequent to the operations of 17) to (126).

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. If the operation is performed while the search is still in progress,
After the search is completed, it enters a pause state.

And the memory read (M-几BAD) key (128
) or number (0 to 9) keys (117) to (126), the search operation state is entered, and after the search is completed, the pause state is entered.

<Numeric (0-9) keys (11'7)-(126)) By operating these keys, each key will change to the disk (20
6) The track number of the data to be played recorded (MU8ICN
O) i.e. trunk number (TNO) and one song (I
Playback song 1 corresponding to the index number (X) in TNO)
Set. Further, it is used in conjunction with the memory (MEMO1(,Y) key (127)) to write numerical key data to the memory channel.

<MEMORY key (127) > Numerical (θ~9) keys (117)~(126) mentioned above or Luta'Z y (DOWN) + (134) , )
y If you press this key after operating the UP key (135), the song number specified there will be stored in the memory channels (1 to 16) of the control circuit (201) AM (213) as data to be stored. Data is written to the lowest free channel number first.

Press the <Memory Read (M4EAD) Key (128)> key several times to move the channel displayed on the memory indicator (114k), and read out the contents of the specified previously written memory channel. Thereafter, by pressing the PLAY key (115), a search operation is performed, and after the search is completed, the memory play mode is entered, and playback is performed sequentially according to the memory channels. Also, when changing the memory channel contents,
Use this key to call up the memory channel you want to change, and then use the memory indicator (114k) for that channel.
) is blinking, press the number (θ~9) keys (117)~
(126) and then press the MEMORY key (
A change in the memory channel contents is made by pressing 127).

<Clear (CIJAR) key (129') > Number (θ
~9) If you press this key when you have operated keys (i17) to (126) by mistake, the data will be canceled and the original song number will be displayed on the music number (MUSICNO) display (114J-). Is displayed. Note that memory read (M-REA)
When the D) key (128) and this key are operated at the same time, a memory all clear operation state is entered.

<Time ('I'IME) key (130)> Each time this key is operated, the time displayed on the time display (11,4m) changes from the elapsed time of one song (normal display) to the elapsed time of all songs, and then to the elapsed time of all songs remaining. It is arranged to switch in the order of time.

<Repeat (REPI No. A, T) key (131) > Each time you operate this key, repeat (repeated playback) of all songs or all memory channels is turned on.

It is designed to be turned off.

<Reverse (rJV) 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 pink-up feed motor (205) to perform a quick return operation.

<Fast forward (FF) 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 the manual play mode, a search operation is performed using the address of the beginning of the currently playing song as the target address.

After the search is completed, the mode returns to the state before the search.

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 search operation, the track number (MUS 1.CNo.
) Search purpose 1゛NO displayed on the display (114J')
A search operation is performed with the target address as the address of the start part of the song with the previous TNO of Δ4USiCNO.
) Indicator (j14j') K For the track number being displayed, that is, the contents of the search target memory channel, a search operation is performed using the address of the memory performance start part corresponding to the contents of the previous memory channel as the target address. It has become.

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

Also, if this key is operated in memory gray mode, a search operation will be performed using the address of the memory play start part corresponding to the next memory channel content as the target address, and after the search is completed, the mode will return to the state before the search. .

Furthermore, when this key is operated during a search operation, in contrast to the case of the down (DO to VN) key (134) described above, in manual gray mode, the song having the next TNO to the search target TNO will start. A search operation is performed with the address of the part as the target address, and even if the memory play mode is 1 (a search operation is performed with the address of the memory play start part corresponding to the next memory channel content of the search purpose memory channel content as the target address). The action is about to take place.

<AUTOPAUSE key (136)
>Every time you operate this key, Auto Bose (automatically enters Bose state after one song is played) is turned on.

It is designed to be turned off.

<Stop (5TOP) key (137)> When this key is operated, the play state is canceled, and after searching for the first song, the disc morph (204) is started.

Pickup feed motor (205) and pink amplifier (
207) is now stopped.

<Data (DATA) indicator (114a) > Flashes when the pink up (207) is reading TOC data recorded in the lead-in area of the disc, and the T
It is designed to light up when all OC data has been read.

<Disc (Disc) indicator (n4b) > After the open/close (OPEN/CLO8E) key (112) is operated, it blinks when the disc loading section (111) is performing an opening/closing operation. In addition, the disc loading section (11
1) is open, the light goes out, and the disc loading section (111
) is closed and the disc (206) is loaded.

<Stop (5TOP) indicator (114C)> Lights up when in the stop state.

<Bose (PAUS E') display (114d)>
It is designed to light up when in a pause state.

<Play (P, LAY) indicator (114e)> Lights up during play mode.

<Memory play (M-PLA, Y) display (114f)
) Lights up when in memory play mode.

<Autobose (A-PAUSE) indicator (114)
〉It lights up when the autobose function is on.

<Total time (T-TIME) indicator (1, 14h
) >Time (TIME) When displayed on the i indicator (114m), it lights up when 1■ is the elapsed time of the entire song.

<Remaining time (R-TIM)'B) indicator (n
ii)>Time (TIME) It is designed to light up when the time displayed on the display is the total remaining time of the song.

<REPEAT> Display (u4j) > Lights up when the repeat function is on.

゛〈Memory indicator (MEMO 几Y INDIC)
ATO 几) (o4k) > 16 channels,
The sections corresponding to all memory channels being written will light up. When 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.

<Track number (MTJSICNO) display (114L) and time (TIME) display (114m)> These are composed of a total of 8-digit numerical displays, and are collectively referred to as an address display section. In other words, two digits on each side on the left side are TNO()
rack number), X (index number), MIN (
minutes) and 5EC (seconds). So MIN, I
c is designed to display the elapsed time of one song (starts from 00 minutes 00 seconds each time the TNO changes), elapsed time of all songs, and remaining time of all songs according to the operation of the TIME key (130). .

Further, when the disc loading section (1n) is open, all the lights are off, and in the playback state, all the lights are on to display the address being played.

If the number (0 to 9) keys (117) to (126) or the memory read (M4EAD) key (128) are operated, only TNO and X are displayed and MIN and SEC are turned off. Also, during the search operation, 1 inch TNO,X flashes,
MIN.

It's like the SEC is going out.

<Pickup position indicator (114n)> Displays the current playing position of the pickup (207) relative to the disk (206). Starting from the left, the part corresponding to the elapsed time of all songs lights up, and the part corresponding to the remaining time of all songs lights up. The lights are set to go out.

The program written in the ROM (214) is shown in a flowchart as shown in FIG. When the program starts, the microcontroller in the control circuit (201) generates a signal to move the pink lug to the program area of the disc record via the interface in this control circuit and the external control circuit (203). , the pickup is moved by the pickup transport motor (205) (step 2). After the pick amplifier is moved, shift focus servo and tracking servo are applied to the servo circuit (209), and the address detection circuit (211) is applied via the RF detection circuit (208) and demodulation circuit (210).
The address (TP) of the current position can then be read. This address (TP) is stored in the RAM (213) via the binder interface and the microcomputer (step 2).

The ROM (214) contains the current position of the pickup + Pffi
(the current position of the address recorded on the disk record) and the amount of address displacement when the pickup is moved a predetermined distance from this current position to the outer circumference (for example, i, ooo trunks) is stored.

Table 1 shows a simple example of this table. The address displacement amount (TI()) is a value calculated assuming that data is recorded on a disc record according to a predetermined standard (track pitch 1.6 μm, linear velocity 1.2 m/S, etc.).

Table 1 Generally, reference positions on disk records (address Ill)
, ) and the arbitrary position (address To) N
is expressed by the following equation.

The reference position (address T+) on the disc record is located at riO from the center of the disc record, and the address (To) is at a position N tracks in the outer circumferential direction from the reed position. Here, the area on the disk record whose radius is from the center of the disk record to address (To) t is S, and the area on the disk record whose radius is from the center to address (T1) '':, S13 area area to area S
The area of the portion excluding 1 is 82.

5=81+82 yt (tpN 10 rl)”==yr rl” + v
T (ToTl) Formula 0 is derived from tp and above. Here, address the current position of the pickup (TP) 1
Let this position be the reference position (radius r). If the pickup is moved N tracks toward the outer circumference of the disk record from this position, the expected address that will be reached will be calculated using the table described above to become the address (TT). Further, if the position actually reached by the pickup after movement is the address (Tn), and the actual linear velocity of this disk record is Vl), then the following equation is obtained.

■From the formula, VT (1,'T −'L'P )=VD (TD −
'Tp) is established. That is, by calculating the ratio of the playing time when moving a known number of tracks, the actual linear velocity of the bass record can be easily determined.

The table in Table 1 is a rough table in which the disk record address (hereinafter referred to as the margin) is divided into 6 parts, but to further improve accuracy, it may be made into a table in units of 1 minute or 1 second. Using this table, RAM (213
The address displacement amount (TI()) with respect to the address (Tp) stored in ) is read out (step ■).

This address displacement (& (TH) and address (TP) is the expected address (TT) when the pickup is moved a predetermined distance (for example, 1,000 tracks).
Calculate (step ■). The microcomputer moves the pickup a predetermined distance via the interface and external control circuit (203) (step 2). The address (TD) that the pickup actually reaches can be read out from the address detection circuit (211), and is sent to the RAM (
213) (step ■). The standard value of linear velocity (1,,2Ill/S) is set in advance to aoM(,
This linear velocity ("i'T
).

address (TP), planned address (TT), address (
TI)) to calculate the actual linear velocity (VI) of the disc record (step).

Here, one embodiment of the disc record playback device of the present invention will be explained using an example of using a microcomputer in the control circuit, but each configuration shown in Fig. It is obvious that this is actually possible. Furthermore, when the present invention is realized using a microcombinator, the flowchart is not limited to that shown in FIG. When software is put together to run a computer, its flowcharts can change over time.

) For example, in the 70-chart of FIG.
The present invention can also be implemented in yards.

〔Effect of the invention〕

As explained above, the inventive disc record playback device can be easily constructed by simply inserting the processing routine based on the flowchart HC shown in Fig. You can know the actual linear velocity of the disc record. This extremely high linear velocity makes it possible to perform various operations at high speed and with high precision, allowing special functions to be added to the disc record reproducing apparatus.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall structure of the present invention, FIG. 2 is a front external view showing an embodiment of a disc record playback device according to the present invention, and FIG. 3 is a disc record playback device shown in FIG. FIG. 4 is a block diagram showing the electrical circuit system of the device, and is a 70-b yard diagram showing the operation of one embodiment of the present invention. 201... Control circuit 202... Disc playback system 2
05...Pickup feed motor 207...Pickup 209...Servo circuit 2
11... Address detection circuit 213... 几AM 214...i (, OM charger
Patent attorney Norichika Kensuke (and one other person) Figure 1.

Claims (1)

[Claims] A reproduction means for reproducing a disc record in which a plurality of pieces of data to be reproduced and their address data are both digitized and recorded, using a pickup that reads these data; means for generating a pickup drive signal to move the pink-up to a program area of the disk drive record by the pickup drive signal generation means; and means for reading a first address after the pickup is moved. A table that stores the address recorded on the disk record, the amount of displacement of the address when the pickup is moved a certain distance from this address, the amount of displacement of the address read from this table, and the first address to keep the pickup constant. a scheduled address calculation means for calculating a scheduled address that is scheduled to be read after the pickup has moved a distance, a means for moving the pickup a certain distance from the first address by the pickup drive signal generating means, and a certain distance of the pickup. means for reading out the first and second addresses after movement; and linear velocity calculating means for calculating the actual linear velocity based on the constant linear velocity, the first address, the planned address, and the second address. A disc record playback device consisting of.