JPH0476129B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a key processing method, and in particular, when operating two operation keys each carrying a predetermined function.
A processing method that selects each function when these two operation keys are operated independently, and selects another function when the two operation keys are operated together (so-called double press). It is related to.

BACKGROUND TECHNOLOGY Small devices such as in-vehicle devices have restrictions on the area of the operation panel surface, so each device has two
Some devices reduce the number of operation keys and make effective use of the panel surface by giving one operation key another function when pressed twice.

By the way, in the key processing of the operation keys, a timer is provided to absorb chattering to prevent malfunctions due to chattering, but in order to perform the double press processing of the operation keys mentioned above, the time of the chattering absorption timer is lengthened. Then, normal key processing takes too much time, and conversely, if the time of the chattering absorption timer is shortened, double-press processing becomes difficult.

Summary of the invention The present invention has been made in view of the above points, and
To provide a key processing method that can reliably perform double press processing and can also quickly respond to quick key operations.

The key processing method according to the present invention sets a predetermined timer when at least one of two operation keys is operated, and during the operating period of this timer, one of the two operation keys is pressed. This key is enabled when the operation is released, and when both operation keys are operated during the above timer operation period, both keys are enabled. If the key is continued to be operated even after the operation period of the timer has elapsed, this key is made valid at the time when the operation period has elapsed.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic perspective view showing the appearance of a slot-in type vehicle-mounted autoloading disk player to which the present invention is applied, and FIG. 2 is a schematic configuration diagram showing the internal structure thereof. First, in Figure 1,
Front panel 2 forming part of housing 1
A slot 4 for inserting a disc 3 to be reproduced is provided extending in the left-right direction in the figure. For example, disk 3 contains audio information.
It is a so-called compact disc recorded using PCM (Pulse Code Modulation), and its outer diameter is approximately 12 cm. The front panel 2 is further arranged with a plurality of operation keys for issuing various operation commands to the disc player, such as play start, disc squeeze, etc. These keys control the operation key group 5. It is configured.

In FIG. 2, the disk 3 inserted through the slot 4 is positioned at a predetermined position on the tray 6 (hereinafter referred to as the slot position) by a positioning means (not shown), and a part of the disk 3 is placed outside the front panel 2. It is supported on the tray 6 in a protruding state. The tray 6 uses 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 like to carry the supported disk 3. It constitutes a loading mechanism for conveying between the slot position and a playback position in the housing 1, which will be described later.

In such a loading mechanism, the tray 6 carries the disk 3 set in the slot position, moves rightward from the solid line position in the figure, and loads the disk 3.
When the center hole of the disc 3 reaches the turntable 10 fixed to the rotating shaft of the spindle motor 9, it descends straight down, and after placing the disk 3 on the turntable 10, it descends further, and the double chain line in the figure As shown, the disk 3 stops at a slight distance from the disk surface, and the disk 3 is loaded through the series of operations described above. The position where the disc 3 is placed on the turntable 10 becomes the aforementioned playback position. Also, remove disk 3.
The operation is performed by reverse rotation of the loading motor 7.
This is carried out by following the completely opposite route to that of the loading operation described above. The above-mentioned loading mechanism has been disclosed in a patent application filed in 1983 by the applicant of the present application.
Applications have been filed in Nos. 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.
is turned on when the disk 3 is set in the slot position, and turned off when the disk 3 is removed from the slot position. The loading completion detection switch 12 is turned on by engaging the tray 6 after the disk 3 has been placed on the turntable 10, and detects that the loading operation is completed. Further, the eject completion detection switch 13 is turned on by engaging the tray 6 that has reached the forwardmost position (front panel 2 side) during the eject operation by the loading mechanism, and detects that the eject operation has been completed. .

Disc 3 placed on turntable 10
is rotationally driven by a spindle motor 9, and its recorded information is read by an optical pickup 14. Pickup 14 is disk 3
The carriage is mounted on a carriage (not shown) that is movable in the radial direction, and the carriage is driven by a gear mechanism 16 by a carriage motor 15.
Driven through. A group of operation keys 5 arranged on the front panel 2 and each detection switch 11 described above
Each signal emitted from ~13 etc. is sent to housing 1
The signal is transmitted to the control system shown in FIG.

Figure 3 shows the configuration of the control system, which is controlled by the central processing unit (CPU).
20 and a RAM (Random Access Memory) 21 as a storage means. The CPU 20 includes a spindle servo circuit 22 that controls the rotational speed of the spindle motor 9 based on signals emitted from the operation key group 5 and the detection switches 11 to 13, etc.;
Generates control signals to the carriage servo circuit 23 that controls the rotational speed of the carriage motor 15, the motor drive circuit 30 that drives the loading motor 7, etc. at timings described later, and displays them on the display 24 that makes various displays. Output data.

The read information read from the disk 3 by the pick-up 14 is subjected to signal processing such as demodulation and error correction in the signal processing circuit 25, and then supplied to the CPU 20. The signal is converted into analog information, passed through the electronic volume circuit 27, and outputted as left (L) and right (R) channel audio signals. Also, the sound is emitted from the pick-up 14 and the disk 3
a focus servo circuit 28 for controlling the position of the condensing point of the information reading spot converged on the recording surface in the direction perpendicular to the recording surface; and a focus servo circuit 28 for controlling the position of the information reading spot in the disk radial direction with respect to the recording track of the disk 3. A tracking servo circuit 29 is provided.

The focus servo circuit 28 controls the CPU 2 at the start of playback or when the focus is lost during playback.
controlling the pickup 14 to perform a focusing operation in response to a command issued from 0;
During normal playback, 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 astigmatism method, and the focus When the servo is locked in when it is pulled in, a lock-in signal is sent to the CPU 20. on the other hand,
The tracking servo circuit 29
4, a tracking actuator (not shown) is supplied with a drive signal in response to a command issued from the CPU 20 during a jump, etc.
During normal reproduction, the position of the information succession point in the disk radial direction is controlled by supplying a tracking error signal generated by a known detection method such as the three-beam method. The tracking error signal is also supplied to the carriage servo circuit 23, and its reduced component becomes the drive signal for the carriage motor 15 during normal reproduction.

This disc player is for car use, so
The CPU 20 is operated by a backup power source,
Each mechanical section is configured to operate using main power supplied by turning on a so-called accessory switch (not shown) of the automobile. However, among the various mechanical parts, only the loading mechanism including the loading motor 7 and its drive circuit 30 is backed up so that the disk 3 taken into the housing 1 can be injected even when the main power is turned off. It is designed to operate on power. 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 includes a volume "UP" key that commands the maximum (UP) and decrease (DOWN) of the volume.
50 and a volume "DOWN" key 51, as well as a balance "L" key 52 and a balance "R" key 53 for balancing the volume of the left and right channels. Processing when these keys are operated is performed by software by the CPU 20.
That is, the CPU 20 is an electronic volume circuit 27.
On the other hand, when the volume "UP" key 50 or the volume "DOWN" key 51 is operated,
Data and clocks are sent to increase or decrease the volume of both left and right channels simultaneously, and when the balance "L" key 52 or the balance "R" key 53 is operated, the volume of one channel is increased and the volume of the other channel is increased. Data and a clock are sent to reduce the volume of the signal, and the detailed method will be described later. The change state of the volume at this time is displayed on the display 24. In addition, as the electronic volume circuit 27, for example,
It consists of multiple resistors connected in series with each other and multiple analog switches connected in parallel to each of these resistors.
A well-known structure that controls the volume by turning it on and off in accordance with data from the CPU 20 may be used.

The volume "UP" key 50 and the volume "DOWN" key 51 each have the function of giving commands to increase and decrease the volume as described above, and when both keys 50 and 51 are operated twice, the volume It also has the function of issuing a command to lower the level by, for example, 20 dB at a time.

Next, the operating procedure of the autoloading disc player executed by the CPU 20 will be briefly explained in accordance with the playback order with reference to the flowcharts of FIGS. 6 to 12.

First, a series of loading, playing, and ejecting operations will be explained according to the flowchart shown in FIG. When set to , the disk detection switch 11 is turned on. When the CPU 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, starts the loading mechanism, and starts the loading operation (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, thereby reaching the position shown by the two-dot chain line in FIG. As shown, the disk 3 is placed on the turntable 10, and the loading operation is completed by the above series of operations. At this time, the loading completion detection switch 12 is turned on.
When the CPU 20 detects the completion of loading by the ON output of the loading completion detection switch 12 (step 3), it shifts to a focus mode for focusing on the pickup 14 (step 4). This focus mode will be described later.

When the focus is taken in the focus mode, the read operation of the pick-up 14 is started, but before reading the program area, the reading of recorded information in the lead-in area of the disk 3 is started (step 5). Thereafter, the display mode (step 6) is entered and then the play mode (step 7) is entered. The read TOC information is stored in RAM21. The lead-in area of the disc contains information such as the number of songs recorded on the disc, the total absolute time, and the playing time of each song.
TOC (Table of Contents) information is recorded, and 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, scan, and search 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). , issues an eject command to the loading motor 7 via the motor drive circuit 30. As a result, the loading motor 7 rotates in the opposite direction to the loading operation and starts the injection operation (step 9). In this eject operation, the tray 6 carries out the disk 3 from the playback position to the slot position by following the completely opposite process to the loading operation described above, and the tray 6 reaches the forwardmost position shown by the solid line in FIG. When the eject operation is completed, the eject completion detection switch 13 is turned on.

When the GPU 20 detects the eject completion by the ON output of the eject completion detection switch 13 (step 10), it then determines whether or not there is a reload command by key input on the operation key group 5 (step 11), and reloads. If there is a command, a loading command is again issued to the loading motor 7 via the motor drive circuit 30 to start the loading operation (step 12). When the completion of the loading operation is detected (step 13),
Since the CPU 20 is playing the same disk as last time and the TOC information is stored in the RAM 21 and is valid, the CPU 20 immediately shifts to the play mode (step 7) without reading the TOC information. Control.

After the eject is completed, if it is determined in step 11 that there is no reload command, it is then determined whether the disk 3 has been removed from the slot position (step 14). This removal of the disk 3 can be detected by the off output of the disk detection switch 11. When it is determined in step 14 that disk 3 has been removed from the slot position, the TOC information stored in RAM 21 is invalidated (step 14).
15), set the invalid flag. 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 disk 3 eject operation is completed, but is invalidated only when the disk 3 is removed from the slot position. Therefore, when continuing to play the ejected disc, there is no need to read the TOC information again, allowing a smooth transition to the playing operation.

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

First, the CPU 20 starts with the focus servo circuit 2.
A command to start the focusing operation is issued to the CPU 20 (step 20), and at the same time a timer for a certain period of time Ta built into the CPU 20 is started (step 20).
twenty one). Then, it is determined whether the focus servo is locked in (step 22), and if it is locked in, the timer is cleared (step 23), and then the process returns to the main flow shown in FIG. In addition, to determine whether the focus servo is locked in,
This is possible by using the 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 the disc is not locked in, it is determined whether a certain period of time Ta has elapsed (step 24). An eject command is issued to the loading motor 7 via the circuit 30 (step
twenty five). That is, if focus cannot be achieved due to scratches or dirt on the disk, or because the disk is inserted upside down, the disk is ejected after a certain period of time Ta has elapsed.

After the eject command, it is determined whether or not there is a reload command such as a key input on the operation key group 5 (step 26). If there is no reload command, the eject completion is detected (step 27), and the operation is continued from then on. It becomes stopped. Furthermore, if it is determined in step 26 that there is a reload command, the key input for that command is ignored (step 28),
After that, the process goes to step 27.

In other words, if the disk cannot be focused due to scratches or dirt on the disk, or the disk is inserted upside down, and the disk is being ejected, the command to reload the disk will not be accepted and the system will not move from the eject operation to the loading operation. It is prohibited. As a result, the user can immediately determine if the disc is 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.

In the main flow of FIG. 6, reading of TOC information is started (step 5), and then the main display mode is entered. As shown in the figure, one segment in the center of the 7-segment display is used to display a blinking "..." (step 30), and when reading of the TOC information is completed (step 31), a certain period of time Tb built into the CPU 20 is displayed. A timer (for example, 5 seconds) is started (step 32), and the TOC information read at the same time, ie, the number of songs, total absolute time, etc., is displayed (step 33). In the flowchart of FIG. 6, for convenience of explanation, the display mode and play mode are shown as separate modes, but after reading the TOC information in the display mode, the play operation begins.

Normally, during the so-called set-up period, which is the time when the TOC information is read and the play operation begins after disk loading is completed, the TOC information has not yet been read and there is no data that can be displayed on the display 24, so nothing can be displayed. It may not be possible to determine what operating state the player is in. However, as described above, even without TOC information, by displaying something, it is possible to notify the user that the player is in the setup state. Note that the display information in this case is not limited to the blinking display of "..." using a 7-segment display.

While displaying the number of songs and total absolute time, etc.
If it is detected that another mode is specified by key input such as track ±, FF, REV, etc. in operation key group 5 (step 34), the timer is cleared (step 35), and at the same time the program area is being played back. Performance (playback) status information, that is, track number, elapsed time (minutes,
seconds), etc. (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, when the number of songs, total absolute time, etc. are displayed, if no other mode is specified and it is determined that the display information has elapsed for a certain period of time Tb (step 37), the process moves to step 36 and the above-mentioned process is performed. Switch to the display of performance status information.

In other words, the read TOC information is stored for a certain period of time.
Only Tb is displayed, and if another mode command is received before the specified time Tb has elapsed, the display switches to the performance status information at that point, and after the specified time Tb has elapsed, the performance status information is automatically displayed. It will switch.

Next, the operation when the focus is lost 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 lock-in signal disappears, it determines that the focus has been lost, and the focus servo circuit 2
A command to start the focusing operation is issued to the CPU 20 (step 40), and at the same time a timer for a certain period of time Tc built into the CPU 20 is started (step 40).
41). Then, it is determined whether or not there is a disc squeeze command or a stop command by key input in the operation key group 24 (step 42), and if there is not, it is determined whether or not the focus servo has locked in (step 42). 43). When the focus servo is locked in, that is, the focus is taken off, the timer is cleared (step 44), and then the play operation is started again. If the focus servo lock-in signal is not obtained within a certain period of time Tc (step 45), at that point the focus cannot be obtained in the current focusing operation (focus
NG), the NG counter built into the CPU 20 is incremented (step 46). and,
It is determined whether the count value N of this counter has reached a predetermined value, for example "16" (step 47),
If ≠16, the process returns to step 40 and the focusing operation is performed again, and the focusing operation is repeated up to 16 times in succession until the focus is achieved.

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

In this manner, 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.

If a disc squeeze command or a stop command is issued during the focusing operation (step 42), the process moves to step 48, where the NG counter is cleared, and then the stop state is established. In addition, if there is a disk squeegee command,
After passing through the stop state, the process moves to the disk eject operation. By clearing the NG counter when there is an eject command or a stop command in this way, even when transitioning from the stop state to the play state and performing the focusing operation again,
This means that the focusing operation can be repeated up to 16 times in a row until the camera is in focus.

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

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 (Acc) based on the detection output (step 60), it then performs a key input on the operation key group 5. Determine whether or not there is an eject command (step
61) If there is an eject command, the eject command is issued to the loading motor 7 via the motor drive circuit 30 in order to eject the disk at the playback position (step 62). After the eject command, it is determined whether or not there is a reload command such as a key input on the operation key group 5 (step 63). If there is no reload command, the eject completion is detected (step 64), and the operation is continued from then on. It will be in a stopped state. If it is determined in step 63 that there is a reload command, the key input for that command is ignored (step 65), and the process then proceeds to step 64.

That is, while the disk is being ejected due to the main power being cut off, a disk reload command is not accepted, and a transition from the eject operation to the loading operation is prohibited. 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, when the volume "UP" and "DOWN" keys 50 and 51 and the balance "L" and "R" keys 52 and 53 are operated,
The key processing method executed by the CPU 20 will be explained.

First, volume “UP” and “DOWN” keys 5
In the case of 0 and 51, as mentioned earlier, these keys have the function of instructing to increase and decrease the volume, respectively, and when both keys are operated together (so-called double press), the volume increases and decreases. For example, it also has the function of issuing a command to lower the level by about 20 dB at a time.
The key processing method will be explained below with reference to the flowchart of FIG.

The CPU 20 constantly monitors at 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 key has been pressed in the previous cycle. It is determined whether it is the same key as before (step 71).
If the key is different from the previous key, start the chattering counter built into the CPU 20 (step 72), and then start the chattering counter built into the CPU 20.
Clear the heavy press timer (step 73) and press 2 more
Turn off the heavy press check flag (step
74). Note that the chattering counter is a counter that absorbs chattering when a key is pressed to prevent malfunctions, the double press timer is a timer that monitors double presses of a key, and the double press check flag is a counter that monitors the key that was pressed. is a flag indicating that the key is for double pressing.

If it is determined in step 71 that the key is the same as the previous key, it is determined whether the chattering counter has counted over (step 75), and if it has, it is determined whether the double check flag is on or not. (Step 76). In the previous cycle, the double press check flag was turned off in step 74, so next, it is determined whether the pressed key is a double press key (step 77), and the double press check flag is turned off. If the key is for use, a double press timer is started (step 78), and a double press check flag is turned on (step 79).

In this way, the double press timer starts when one of the two double press keys is pressed, and during the operation period of the timer, the step
If it is determined in step 70 that the key is not pressed, that is, the key has been released, it is confirmed that the double press check flag is on (step 80), and then the key is made valid (step 80). 81).

Similarly, during the operation period of the double press timer, it is determined whether the timer has timed out through step 76 (step 82), and if the timer has timed out, the key being pressed at that time is made valid. (Step 81). If the time has not exceeded, it is determined whether or not the key has been pressed twice (step 83). If the key has been pressed twice, the process moves to step 81 and both keys are activated and the key is pressed twice. Accept push.

That is, when the key for double press is pressed, the CPU 20 operates the double press timer,
During the timer operation period, if either of the two double-press keys is pressed, that key is accepted by detecting that the key is released, and if both keys are pressed together, the key is accepted. If the key is pressed twice, it is accepted as a double press, and if either of the two keys is pressed when the timer operation period has elapsed, that key is accepted.
After accepting each key, the electronic volume 2 is pressed to execute the function of each key or the double press function.
7 (see FIG. 4).

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. ,
This allows quick and repeated key operations to be responded to quickly.

In addition, in this embodiment, the key processing method for the double press key is the volume "UP",
Although the case of the "DOWN" keys 50 and 51 has been described, the present invention is not limited to these keys.
Furthermore, the applicable equipment is not limited to this disc player.

Next, balance "L", "R" keys 52, 53
A method for adjusting the volume balance between the left and right channels will be explained with reference to the flowchart in FIG. 12.

The CPU 20 constantly monitors whether any key in the operation key group 5 is pressed in a predetermined cycle, and if it is pressed, that key is the balance "L" or "R" key 52 or 53. (Step 90). When any key is pressed, key identification data corresponding to that key is stored in a register built into the CPU 20. Balance "L", "R" keys 52, 53
If neither of these is the case, the register is reset (step 91), and the process then waits for the next cycle.

At step 90, balance “L” or “R” key 5
If it is determined that 2 or 53 is pressed,
By comparing the key identification data stored in the previous register with the current key identification data, it is determined whether the key is the same key as in the previous cycle (step 92). With this judgment,
It can be determined whether the same key is pressed continuously. If it is not a continuous press, rewrite the key identification data in the register (step 93),
Next, it is determined whether the key is the balance "L" key 52 (step 94). If it is the balance "L" key 52, to increase the volume of the L channel and decrease the volume of the R channel,
Data and clock are sent to the electronic volume 27 (see FIG. 4) (step 95), and vice versa if it is the balance "R" key 53 (step 96).

If it is determined in step 92 that the button has been pressed continuously, it is determined whether the volume of the left and right channels is balanced (center balance state) (step 97),
If the balance is not maintained, the process moves to step 94 and the same operation as described above is performed, and if the balance is achieved, the acceptance of continuous presses is stopped 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, by stopping accepting continuous presses at that point,
This produces the so-called center click effect.
A center balance state can be easily and reliably obtained, and operation 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 case where the above-described volume balance processing method is applied to an electronic volume circuit in a disc player has been described, 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

Effects of the Invention As explained above, according to the key processing method of the present invention, a predetermined timer is set when at least one of the two operation keys is operated, and during the operation period of this timer, the two operation keys are set. When the operation of one of the operation keys is released, this key is made valid, and when both operation keys are operated during the operation period of the above-mentioned timer, both keys are made valid; If one of the two operation keys continues to be operated even after the timer operation period has elapsed, this key will be enabled once the operation period has elapsed to ensure that double presses are handled reliably. In addition, since one key operation can be performed even during the timer operation period, it is possible to quickly respond to rapid key operations.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing the external appearance of an in-vehicle autoloading disk player according to the present invention, FIG. 2 is a schematic configuration diagram showing its internal structure, and FIG. 3 is a block diagram showing the circuit configuration of the control system. FIG. 4 is a block diagram showing a specific configuration of a part of the circuit shown in FIG.
FIG. 5 is a diagram showing an example of a display method, and FIGS. 6 to 12 are flowcharts showing each operation procedure executed by the CPU. Explanation of symbols of main parts, 1...Housing, 3
...Disk, 4...Slot, 5...Operation key group, 7...Loading motor, 9...Spindle motor, 11...Disk detection switch, 12
...Loading completion detection switch, 13...Ejection completion detection switch, 14...Pickup, 15...Carriage motor, 27...Electronic volume circuit.

Claims (1)

[Claims] 1 When operating two operation keys each having a predetermined function, when each of the two operation keys is operated alone, each function is selected, and when the two operation keys are operated together, the other function is selected. A processing method that performs key processing to select a function, wherein a predetermined timer is set when at least one of the two operation keys is operated, and the two operations are performed during the operation period of the timer. When the operation of one of the keys is released, this key is made valid, and when the two operation keys are both operated during the operation period of the timer, both keys are made valid, and the A key processing method characterized in that when either one of the two operation keys is continuously operated even after the operation period of the timer has elapsed, this key is made valid at the time when the operation period has elapsed. .