JPS62259257A - Autoloading disk player - Google Patents

Abstract

PURPOSE:To simplify the control of replaying of an ejected disk by invalidating the contents stored in a recording information storing means in a read-in area of a disk at the disappearance of a slot position detecting signal after the completion of carrying of the disk by a loading mechanism. CONSTITUTION:In the read-in area of the disk 3, TOC information such as the number of musical programs recorded on the disk, the total absolute time and the playing time of each musical programs is recorded, and the read TOC information is stored in a RAM21. When the ejecting operation of the disk 3 is completed after the end of playing, a CPU20 detects the completion and then decides the existence of a load command. When the disk 3 is ejected at the decision of absence of the load command, the TOC information stored in the RAM21 is invalidated at the decision of ejection of the disk from a slot position. Thus, the replaying of the ejected disk can be simply controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called slot-include automatic Ω-ding disc player.

A small digital audio disc with a diameter of approximately 12 ca+ called a TakeshiiL5 Compact Disc has a lead-in area containing information such as the number of songs recorded on the disc, absolute time, playing time of each song, etc. information is recorded in the lead-in area, and when the disc is played back, the recorded information in the lead-in area is always read. The read information is then stored in a memory and used as appropriate for display on a display, program selection, and the like.

By the way, in order to save the time and effort required for disc loading, disc players are equipped with a loading mechanism that automatically transports discs between the slot (disc insertion/ejection port) position of the housing and the playback position within the housing. There is something.

In such an autoloading disc play V,
After a disc is ejected, the same disc may be played again by issuing a so-called reload command to reinsert the same disc without handling it from the slot position. In such a case, conventionally, the contents stored in the memory were invalidated when the disc was ejected, so it was necessary to read the stored information in the lead-in area again after the loading was completed with the 0-code. .

1. The present invention has been made in view of the above-mentioned points, and when the disc is reloaded without being removed after being ejected, the recording information in the lead-in area must be read again. The purpose of the present invention is to provide an autoloading disc player that eliminates the need for autoloading.

The autoloading disc player according to the present invention comprises:
The disc is equipped with a storage means for storing recorded information in the lead-in area of the disc read by the pickup, and is configured to invalidate the stored contents of the storage means when the ejected disc is removed from the slot position. .

Husband-Ei-1 Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic perspective view showing the external appearance of a slot-in type vehicle-mounted autoloading disc player to which the present invention is applied, and FIG. 2 is a schematic configuration diagram showing the internal structure thereof. First, in FIG. 1, a front panel 2 constituting a part of a housing 1 has a slot 4 for inserting a disc 3 to be played, extending in the left and right direction of the figure.
QsJ has been done. For example, the disc 3 contains audio information such as PCM (Pulse Code Modula).
This is a so-called compact disc that is recorded in a compact format, and its outer diameter is approximately 12c++. A plurality of operation keys are further arranged on the front panel 2 for instructing the disc player to operate the platform scale, such as play start, disc eject, etc., and these keys constitute an operation key group 5. There is.

In FIG. 2, disk 3 inserted from slot 4
is positioned at a predetermined position (hereinafter referred to as a slot position) on the tray 6 by a positioning means (not shown), and the disk 3 is supported on the tray 6 with a part of it protruding outside the front panel 2. The tray 6 is driven by a loading motor 7 as a driving source, a driving force transmission mechanism 8 that transmits the rotational driving force of the motor 7 to the tray 6 as a linear driving force in the horizontal and vertical directions in the figure, and the loaded disk 3 is inserted into the slot. It constitutes a loading mechanism for conveying between the position and a playback position in the housing 1, which will be described later.

In this loading mechanism, the tray 6 carries the disk 3 set in the slot position and moves rightward from the solid line position in the figure, and the center hole of the disk 3 is attached to the turntable 10 which is fixed to the rotating shaft of the spindle motor 9. When it reaches the top, it descends straight down, and after placing the disc 3 on the turntable 10, it descends further and stops at a slight distance from the disc surface as shown by the two-dot chain line in the figure, and the above sequence is continued. The loading operation of the disk 3 is performed by the operation. The position where the disc 3 is placed on the turntable 10 becomes the previously mentioned playback position. Further, the ejecting operation of the disk 3 is performed by the reverse rotation of the loading motor 7, following a path completely opposite to that of the above-mentioned loading operation. The above-mentioned loading mechanism was disclosed in a patent application filed in 1973 by the applicant.
Nos. 9-200145@ to 200153, etc., and the detailed configuration and operation thereof will not be described in detail here.

Various detection switches are provided within the housing 1. First, a disk detection switch 11 is provided to detect that the disk 3 is in the slot position.This disk detection switch 11 is turned on when the disk 3 is set in the slot position, and when the disk 3 is removed from the slot position. It turns off when it is turned off. The loading completion detection switch 12 is turned on by engaging the tray 6 after the disc 3 has been placed on the turntable 10, and detects that the loading operation is completed. Further, the ejection completion detection switch 13 is
When the loading mechanism engages with the tray 6 that has reached a position of 1 m (on the front panel 2 side) during an eject operation, it becomes an on state, and it is detected that the eject operation is completed.

A disk 3 placed on a turntable 10 is driven to rotate by a spindle motor 9, and recorded information is read by an optical pickup 14. The pickup 14 is mounted on a carriage (not shown) that is movable in the radial direction of the disk 3.1. The carriage is driven by a carriage motor 15 via a gear mechanism 16. A group of operation keys 5 arranged on the front panel 2 and the above-mentioned detection switches 11 to 1
Each signal emitted from the housing 1 is transmitted to a control system shown in FIG.

FIG. 3 shows the configuration of the control system, and the 1III
The III system is controlled by the CPU (central processing
device) 20 and RAM (random
It has a microcomputer configuration consisting of an access memory) 21, etc. The CPU 20 controls the spindle servo circuit 22, which controls the rotation speed of the spindle motor 9, and the rotation speed of the carriage motor 15, based on signals emitted from the operation key group 5, each detection switch 11 to 13, etc. It generates a t111n signal to the carriage servo circuit 23, the motor drive circuit 30 that drives the loading motor 7, etc. at timings described later, and outputs display data to the display 24 that makes various displays.

The read information read from the disk 3 by the pickup 14 is subjected to signal processing such as demodulation and error correction in the signal processing circuit 25, and then supplied to the CPLI 20.
It is converted into analog information by a D/A (digital/analog) converter 26, passed through an electronic volume circuit 27, and then sent to the left (
L, ), and is output as a right (R) channel audio signal. In addition, the focus servo circuit 28 does not control the position of the focal point of the information reading spot emitted from the pickup 14 and converged on the recording surface of the disk 3 in the vertical direction with respect to the recording surface. A tracking servo circuit 29 is provided to control the position of the information reading spot in the disk radial direction.

The focus servo circuit 28 controls the focusing operation of the pickup 14 in response to a command issued from the CPLJ 20 at the start of playback or when the focus is lost during playback, and during normal playback, the focus servo circuit 28 controls the focusing operation of the pickup 14. A focus actuator (not shown) built into the pickup 14 is driven and controlled based on a focus error signal generated by a well-known detection method such as the point aberration method, and a focus actuator (not shown) is generated when the focus servo is locked in when the focus servo is pulled in. is sent to the CPU 20. on the other hand,
The tracking servo circuit 29 supplies a drive signal to a tracking actuator (not shown) built into the pickup 14 in response to a command issued from the CPU 20 during a jump, etc., and provides a drive signal using a three-beam method or the like during normal playback. By supplying a tracking error signal generated by a known detection method, the position ffi&lj of the information reading point in the disk radial direction is controlled. In addition,
The tracking error signal is also supplied to the carriage servo circuit 23, and its low frequency component becomes a drive signal for the carriage motor 15 during normal reproduction.

Since this disc player is for automotive use, CPLJ20
is operated by a backup power source, and each mechanical section is configured to operate by main power supplied by turning on a so-called accessory switch (not shown) of the automobile. However, among each Q structure, loading motor 7
Only the 0-ding mechanism including the drive circuit 30 is
It is designed to operate with a backup power source so that the disk 3 taken into the housing 1 can be ejected even if the main power source is turned off. An ACC detection circuit 31 is provided for detecting disconnection of the main power supply, and this ACC detection circuit 31 supplies a detection signal to the CPU 20 when the main power supply is disconnected.

As shown in FIG. 4, each key in the operation key group 5 commands the increase (UP) and decrease (DOWN) of the sound G, the volume rUPJ4=-50 and the volume rDO.
WNJ key 51 and balance for balancing the volume of left and right channels ]゛L” key 52 and balance 1-
"R" key 53 is included. Processing when these keys are operated is performed by software by the CPU 20. That is, the CPU 20 sends data and a clock to the electronic volume circuit 27 in order to simultaneously increase or decrease the congruence of both the left and right channels when the volume 1° UPJ key 50 or the volume DOWNJ key 51 is operated. When the balance "L" key 52 or balance 1°R" key 53 is operated, data and clocks are sent out to increase the volume of one channel and decrease the volume of the other channel.
The detailed processing method will be described later. The change state of the volume at this time is displayed on the display 24.

The electronic volume circuit 27 may include, for example, a plurality of resistors connected in series with each other and a plurality of analog switches connected in parallel to each of these resistors. By turning it on and off, a well-known structure can be used to control the volume.

Volume rUPJ key 50 and volume rDOWN
The J keys 51 each have the function of instructing the increase and decrease of wealth m as described above, and both keys 50 and 51
When the is operated twice, it also has the function of issuing a command to lower the 8th gear at once by, for example, 20c [3].

Next, the operating procedure of the autoloading disc player executed by the CPU 20 will be described in FIGS. 6 to 12.
A brief explanation will be given according to the playback order with reference to the flowchart in the figure.

First, a series of loading, playing, and ejecting operations will be explained according to the flowchart in FIG. 6. The disc 3 is inserted into the housing 1 from the slot 4,
When the disc is set in the slot position on the tray 6 as shown in the figure, the disc detection switch 11 is turned on. C.P.
When the LJ 20 detects that the disk detection switch 11 is turned on (step 1), it issues a loading command to the loading motor 7 via the motor drive circuit 30. As a result, the loading motor 7 rotates, the loading mechanism is activated, and the loading operation is started (step 2). When the tray 6 carrying the disk 3 moves to the right from the position shown by the solid line in FIG. 2 and reaches above the turntable 10, it descends directly below from that position.
As a result, the disk 3 is placed on the turntable 10 as shown by the two-dot chain line in FIG. 2, and the above series of operations completes the loading operation. At this time, the loading completion detection switch 12 is turned on. CPLI2
0 detects the completion of loading by the ON output of this loading completion detection switch 12 (step 3).
, shift to focus mode for focusing the pickup 14 (step 4)
. This focus mode will be described later.

When the focus is taken in the focus mode, the reading operation of the pickup 14 is started, but before reading the program area, the reading of the recorded information in the lead-in area of the disc 3 is first started (Step 5), and then A transition is made to the play mode (step 7) via the display mode (step 6). TOC read
Information is stored in RAM21. In the lead-in area of the disc, there is a so-called TOC (Table
e Of Contents) information is recorded,
It is necessary to read this TOC information before starting a performance. In the play mode, in addition to normal sequential performance, operations such as program selection, scanning, and searching are performed.

When the performance ends and the carriage (not shown) carrying the pickup 14 reaches its travel limit position and a detection switch (not shown) is turned on, at this point the CPU 20 detects that the performance has ended (step 8). An eject command is issued to the loading motor 7 via the motor drive circuit 30. As a result, the loading motor 7 rotates in the opposite direction to that during the loading operation and starts the ejecting operation (step 9). In this ejecting operation, the tray 6 carries out the disc 3 from the playback position to the slot position by following the completely opposite process to the loading operation described above, until the tray 6 reaches the frontmost position shown by the solid line in FIG. When the ejecting operation is completed, the ejecting completion detection switch 13 is turned on.

The CPLI 20 uses this ejection completion detection switch 13
When the eject completion is detected by the on-output of step 10), it is then determined whether or not there is a manual reload command for keys in the operation key group 5 (step 11).
, if there is a 0-mode command, the motor drive circuit 3 is reactivated.
0 to the loading motor to start the loading operation (step 1
2).

When the completion of the loading operation is detected (step 13)
, the CPU 20 is playing the same disc as last time,
Since the ToC information is stored in the RAM 21 and is valid, control is performed to immediately shift to the play mode (step 7) without reading the TOC information.

After the ejection is completed, if it is determined in step 11 that there is no O-do command, then it is determined whether the disk 3 has been removed from the slot position (step 14).

To remove this disk 3, press the disk detection switch 11.
It can be detected by the off output of When it is determined in step 14 that the disk 3 has been widely removed from the slot position,
The TOC information stored in the RAM 21 is invalidated (step 15), and an invalid flag is set. With the above steps, the series of operations of loading, playing, and ejecting is completed.

In the series of operations described above, the TOC information stored in the RAM 21 is not invalidated when the eject operation of the disk 3 is completed, but is invalidated only when the disk 3 is removed from the slot position. Therefore, when the ejected disc is to be played again, there is no need to read the TOC information again, and the playing operation can be smoothly performed.

Next, focus mode (step 4) in Fig. 6
This will be explained according to the flowchart in FIG.

First, the CPLJ 20 issues a command to start a focusing operation to the focus servo circuit 28, and executes step 20.
), and at the same time a fixed time i! built into the CPU 20! The timer of ITa is started (step 21). Then, it is determined whether or not the focus ball is locked in (step 22), and if it is locked in, the timer is cleared (step 23), after which the process returns to the main screen in FIG.

Note that it is possible to determine whether or not the focus servo is locked in by using a lock-in signal generated from the focus servo circuit 28 when the focus servo is locked in.

If it is determined in step 22 that lock-in has not been achieved, it is determined whether a certain period of time 7a has elapsed (step 24), and if it has elapsed, the disc loaded at playback position n is ejected. Motor drive circuit 30
An eject command is issued to the loading motor 7 via the (step 25). That is, if focus cannot be achieved due to scratches or dirt on the disc, or because the disc is inserted upside down, the disc is ejected after a certain period of time Ta has elapsed.

Step 26: If the eject command is violated, it is determined whether or not there is a 0-eject command by manual operation of keys in the operation key group 5.
), if there is no reload command, the completion of the lottery is detected (step 27), and the operation is stopped thereafter. If it is determined in step 26 that there is a reload command, the key input for that command is ignored (step 28), and the process then proceeds to step 27.

In other words, if the focus cannot be taken due to scratches or dirt on the disc, or the disc is inserted upside down, and the disc is being ejected, the disc loading command is not received, and the ejecting operation shifts to the loading operation. It is prohibited. As a result, the user can immediately determine if the disc has been inserted upside down, and if the disc is scratched or dirty, it is possible to prevent the disc from being played.

Next, the display mode (step 6) in FIG. 6 will be explained according to the flowchart in FIG. 8.

In the main flow of FIG. 6, when reading the TOCI information is started (Step 5), the model display mode is entered. From the time the reading of the TOC information is started, predetermined information is displayed on the disk display 24, for example, as shown in FIG. 7 as shown in
Use one segment in the center of the segment display to select r-
--- Display J blinking (step 30), TOC
When the reading of the information is completed (step 31), the CPU 2
0 is started (step 32), and the TOC information read at the same time, ie, the number of songs, total salary versus time, etc., is displayed (step 33). In addition, in the flowchart of FIG. 6, the display mode and play mode are shown as separate modes for convenience of explanation, but in the display mode, the TOC
After reading the information, play operation begins.

Normally, at the time of so-called Sera i-up, which is the time when the TOC information is read after the disc has been loaded and the play operation begins, the TOC information has not yet been read.
Since there is no data to display on the display 24 and nothing can be displayed, the user may not be able to determine what operating state the player is in. However, as described above, even if there is no TOC information, it is possible to notify the user that the player is in the setup state by displaying some kind of display. In addition, the display information in this case is r------ using a 7-segment display.
The display is not limited to the blinking J.

If it is detected that another mode has been manually designated by keys such as track engineer, FF, REV in operation key group 5 while the number of songs and total salary vs. time, etc. are being displayed, (
Step 34), Clear the timer Step 35),
At the same time, based on the read information of the pickup 14 that is playing the program area, performance (playback) status information, that is, song '1
t1 (track number), the elapsed time (minutes and seconds) from the start of the performance of each song, etc. are displayed (step 36).

This performance information is recorded in the Q channel of the subcode signal in the so-called CD format, and can be detected from the information read by the pickup 14. In addition, in the state where the number of songs and σ total absolute time, etc. are displayed, if there is no other mode specified and it is determined that the display state has elapsed for a certain period of time Tb (step 37), the process moves to step 36 and the j Switch to the display of performance status information.

That is, the read TOC information is displayed for a certain period of time Tb, and if another mode is specified before the certain period of time Tb passes, the display switches to the performance status information at that point and the certain period of time Tb is displayed. When the time has elapsed, the display automatically switches to the performance status information.

Next, the operation when the focus goes out during play will be explained according to the flowchart of FIG. 9.

The CPU 20 constantly monitors the lock-in signal generated from the focus servo circuit 28 in the lock-in state of the servo loop in a predetermined cycle, and when it detects that the C01 twin-in signal disappears, it determines that the focus has been lost.
A command to start the focusing operation is issued to the focus servo circuit 28 (step 40), and at the same time, the CPLJ 20
Start the timer for a certain period of time Tb built into the
Step 41). Then, it is determined whether there is a manual disc eject command or a stop command in the operation key group 24 (step 42), and if there is no key, it is determined whether the focus servo is locked in (step 43). . When the force nervo is locked in, that is, when the focus is obtained, the timer is cleared (step 44), and the play operation is then started again. If the lock-in signal of the focus servo is not obtained within the fixed time TC (step 45), it is assumed that the current focusing operation could not focus (focus NG), and the NG counter built in the CPtJ20 is incremented ( Step 46). Then, it is determined whether or not the count value N of this counter has reached a predetermined value, for example, '16' (step 47). If N≠16, the process returns to step 40 and the focusing operation is performed again, and the focus is Repeat the focusing operation up to 16 times in a row until you get the focus.

If focus cannot be achieved even after repeating the focusing operation 16 times in a row, clear the NG counter (step 48), and then set the stop state (step 49). Here, the stop state refers to a state in which the disc is at the playback position, the main power is cut off, and each mechanical section stops operating. In this stopped state, operate key group 5.
When it is detected that a play command has been issued by the key operator (step 50), the process moves to step 40 and the focusing operation is started again.

In this way, by limiting the number of consecutive focusing operations, it is possible to reduce the load on the servo system including the focus actuator and the like, and to prevent the pickup 14 from generating heat.

Furthermore, if a disc eject command or stop command is issued during the focusing operation (step 42),
The process moves to step 48, where the NG counter is cleared, and then a stop command is issued.

Note that if there is a disc eject command, the process goes through a stop state and then moves to a disc eject operation.

By clearing the NG counter when there is an eject command or stop command in this way, even when moving from the stop state to the play state and performing the focusing operation again, the focusing operation can be performed up to 16 times in a row until the focus is achieved. This allows you to repeat the action.

Next, the operation when the accessory switch of the car is turned off during play as a special operation will be explained according to the flowchart of FIG. 10.

The CPU 20 constantly monitors the detection output of the ACC detection circuit 31 in a predetermined cycle, and when it detects disconnection of the main power supply (Ace) based on the detection output (step 60), it then manually presses the key in the operation key group 5. In step 61), it is determined whether or not there is an eject command, and if there is an eject command, the motor is activated to eject the disc at the playback position. An eject command is issued to the loading motor 7 via the J1 circuit 30 (step 62
). After the eject command, step 63) determines whether there is a manual reload command in operation 4, group 5, etc., and if there is no 0-mode command, detects the eject completion in step 64). After that, the operation will be stopped. If it is determined in step 63 that there is an O-do command, the key input for that command is ignored and the process proceeds to step 65), followed by step 64.

In other words, while the disk is being ejected by the main power supply, the disk load command will not be accepted.
This prohibits the transition from the eject operation to the loading operation. Thereby, the loading operation and the ejecting operation are not repeated, and a drop in battery voltage can be prevented.

Next, in the operation key group 5, select the volume [UPJ, r
DOWNJ key 50.51 and balance rLJ, -r
When RJ keys 52 and 53 are operated, CPIJ20
The key processing method executed by is explained below.

First, volume l' (JPJ, roOWNJ key 50
．． In the case of 51, as mentioned above, these keys each have the function of commanding volume increase and decrease, and when both keys are operated together (so-called 2, river push), Ba is pressed, for example. 20. It also has the function of instructing to lower the degree of E at once, and the key processing method will be explained below with reference to the flowchart of FIG.

The CPU 20 constantly monitors in a predetermined cycle whether or not any key in the operation key group 5 has been pressed (Step 70), and if any key has been pressed, the CPU 20 constantly monitors whether or not any key in the operation key group 5 has been pressed. It is determined whether the key is the same as (step 71). If the key is different from the previous key, start the chattering counter built into CPtJ 20! (step 72), followed by CPtJ2
Step 7 to clear the double press timer built into 0
3) Furthermore, the two-way push check flag is turned off (step 74). Note that the chattering counter is a counter that absorbs chattering during key operation to prevent malfunctions, the double press timer is a timer that monitors double presses of a key, and the 2-hand press check flag is a counter that monitors double presses of a key. This is a flag indicating that the key is for heavy pressing.

If it is determined in step 71 that it is the same key as last time, it is determined whether the chattering counter has counted over (step 75), and if it has exceeded, it is determined whether the double check flag is on or not. A decision is made (step 76). In the previous cycle, the double press check flag was turned off in step 74, so next, in step 77), it was determined whether the key being pressed is a double press key. If so, start the double press timer (step 78) and turn on the double press check flag (step 79).
.

In this way, the double press timer starts when either of the two double press keys 4-1 is pressed, and during the operation period of the timer, it is determined in step 70 that no key is pressed, that is, the key is not pressed. If it is determined that the person has been separated, 2
Make sure that the heavy press check flag is on (step 80), and then enable the key (step 81).

Similarly, during the operation period of the double-press timer, it is determined whether the timer has timed out or not via step 76 (step 82), and if the timer has timed out, the key being pressed at that time is made valid (step 82). Step 81)
. In addition, if the time has not exceeded, it is determined whether or not the key has been pressed twice (step 83); if it has been pressed 2m, the process moves to step 81 to enable both keys and double press the key. Attach the reception.

In other words, the CPtJ20 operates a double press timer when a double press key is pressed, and during the timer operation period, when either of the two keys for double presses is pressed. When the key is released, the key is accepted by detecting that the key has been released, and when both 4 knees are pressed together, it is accepted as a double press, and furthermore, when the timer operation period has passed. When either of the two keys is pressed, processing is performed to accept that key. After each key is pressed, data and a clock are sent to the electronic volume 27 (see FIG. 4) in order to execute the function of each key or the opening of two melons.

In this way, by providing a double press timer and detecting that one key is pressed and then released during the timer's operating period, it is possible to perform one key process even during the timer's operating period. , it is possible to quickly respond to rapid repeated key operations.

In this embodiment, the key processing method for the double-press key is described for the volume 1° UPJ and rDOWNJ keys 50.51, but the method is not limited to these keys. Furthermore, the applicable equipment is not limited to this disc player.

Next, a processing method for adjusting the balance of the sound m of the left and right channels using the balance rLJ and rRJ keys 52 and 53 will be explained according to the flowchart of FIG. 12.

The CPU 20 constantly monitors in a predetermined cycle whether or not any key in the operation key group 5 has been pressed, and if pressed, that key is the balance rLJ or rRJ key 5.
2 or 53 (step 90).

When any key is pressed, key identification data corresponding to that key is stored in a register built into the CPIJ 20. If neither the balance rLJ nor the rRJ key 52 or 53 is present, the register is reset (step 91), L, and then the next cycle is held.

If it is determined in step 90 that the balance rLJ or rRJ key 52 or 53 is pressed, the key identification data stored in the register last time and the current key identification data are compared to determine whether the key is Determine whether it is the same key as in the cycle (step 92)
. Based on this determination, it is possible to determine whether the same key is being pressed continuously. If not pressed continuously,
Change the key identification data of the register (step 93)
Then, it is determined whether the key is the "Balance 1°L" key 52 (step 94). In the case of the balance rLJ key 52, the electronic volume 27 is used to increase the volume of the L channel and decrease the N amount of the R channel.
(Step 95) to send data and a clock to the balance rRJ key 53 (see FIG. 4), and perform the opposite control if it is the balance rRJ key 53 (Step 96).

If it is determined in step 92 that the volume has been pressed continuously, it is determined whether the volume of the left and right channels is balanced (center balance state) or not (step 97); if the volume is not balanced, the process moves to step 94 and the above-mentioned procedure is performed. Perform the same motion, and when the balance is achieved, stop attaching the receiver of continuous push at that point. The center balance state can be detected by comparing the left and right channel data sent to the electronic volume circuit 27 and checking whether the two data match.

In this way, if the balance key is pressed continuously and the center balance state is reached, the so-called center click effect can be obtained by stopping the continuous presses at that point. A balanced state can be obtained, and operations can be performed without looking at the display. Therefore, it is particularly useful for in-vehicle equipment that is often operated without checking the display.

In this embodiment, the above-described volume balance processing method is applied to an electronic volume circuit in a disc player, but the invention is not limited to this, and it can be applied to a normal tone control circuit, fader control circuit, etc. It can also be applied to

As explained above, according to the autoloading disc player of the present invention, the recorded information in the lead-in area of the disc stored in the -II memory is not invalidated when the eject operation is completed; By invalidating the disc only when it is removed from the slot position, there is no need to read the recorded information in the lead-in area again when the ejected disc is played again, making the second performance smoother. It is possible to move to

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing the external appearance of an in-vehicle autoloading disc player according to the present invention, FIG. 2 is a schematic configuration diagram showing its internal structure, FIG. 3 is a block diagram showing the circuit configuration of the control system, and FIG. 4 is a block diagram showing a specific configuration of a part of the circuit shown in FIG. 3, and FIG. 5 is a diagram showing an example of a display method.
6 to 12 are flowcharts that do not show the order of each operation executed by the CPU. Explanation of symbols of main parts 1... Housing 3... Disc 4... Slot 5... Operation key group 7... Loading motor 9 ... Spindle motor 11 ... Disc detection switch 12 ...
- Loading completion detection switch 13...Ejection completion detection switch 14...Pickup 15...Ki 1ν ridge motor 27...Electronic volume circuit Mo, 4 U! J 2Δ Yuu 5 zu Qin ro concave 7 zu xiao 8 Hui filial, 9 zu wei to vJE II, IIUJ Volume! Figure 2

Claims (1)

[Claims] A disc player comprising a loading mechanism for transporting a disc between a slot position in a housing and a playback position in the housing, the pickup reading recorded information on the disc at the playback position;
The storage means includes a storage means for storing recorded information in a lead-in area of the disc read by the pickup, and a disc detection means for detecting the presence of a disc in the slot position and generating a detection signal. The autoloading disc player is characterized in that the stored contents are invalidated at the time when the detection signal disappears after the loading mechanism completes ejecting the disc.