JPH0522985B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to, for example, a CD (optical compact disc) type DAD (digital audio disc).
Relating to a disc record playback device suitable for
Especially regarding its control system.

[Technical background of the invention and its problems]

Recently, in the field of audio equipment, digital recording and playback methods that utilize PCM (pulse code modulation) technology are being adopted in order to achieve high-fidelity playback as much as possible.

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

In this case, a system that uses a disk as a recording medium is called a DAD system.
Optical, electrostatic, and mechanical methods have been proposed as recording and reproducing methods, but no matter which method is adopted, the reproducing device that embodies it is still a conventional method. There is a need for devices that can satisfy various advanced control functions and performances that are not found in other devices.

In other words, taking the CD system as an example, this is a transparent resin disk with a diameter of 12 cm and a thickness of 1.2 mm, and a thin metal film that forms pits (irregularities with different reflectances) corresponding to digital (PCM) data. The disk coated with The disk is played using a linear tracking method toward the outer periphery, but the track pitch of the disk is
With a size of 1.6 μm, a huge amount of information that can provide approximately 1 hour of stereo playback on one side is digitized and recorded in the program area (radius 25 to 58 mm) along with address data, as well as the maximum and minimum song numbers. Data, etc. are in the lead-in area (radius 23 to 25
This can easily be seen from the fact that it has been digitized and recorded in MM).

However, conventionally known disk record playback devices of this type have not yet been developed with excellent operability and display performance to satisfy the advanced control functions.
This was considered to be an issue that needed to be resolved urgently.

In particular, conventional CD players have only one disk loading section for one disk drive playback section, and each time one disk is finished playing, another disk must be newly loaded. There is a problem in that operability is significantly impaired in that it is not possible to perform organic continuous playback operations or arbitrary playback operations that have a certain relationship with the disk.

It should be noted that in recent years, it has been considered that CD players can be applied to commercial multi-disc playback devices such as so-called joke boxes and karaoke machines, but this is only in a form that is suitable only for that type of use. However, the above-mentioned request for truly improving operability and improving usability could not be met.

[Purpose of the invention]

Therefore, this invention was made in view of the above points, and is intended to reliably provide advanced control functions with a simple configuration, especially in a disk record playback device that plays back a disk containing digitized data. It is an object of the present invention to provide an extremely good disc record reproducing device which has been improved to improve operability and contribute to improved operability.

[Summary of the Invention] That is, a disc record reproducing apparatus according to the present invention is a disc record reproducing apparatus for reproducing a disc on which a plurality of data to be reproduced and their address data are both digitized and recorded. 2 disk loading section,
a disk reproducing drive means for selectively bringing one of the disks loaded into the first and second disk loading sections into a reproducing driving state; Reproduction disk command means for giving a reproduction command to the disk reproduction driving means to select which one to reproduce; and a disk detection means for detecting whether or not a disk is loaded in the first and second disk loading sections. and when the disk playback driving means is in a playback driving state in which a disk loaded in one of the disk loading sections is selected, and the playback command means gives a playback command to the non-selected disk. , based on the detection signal from the disk detecting means, it is determined whether or not the non-selected disk is loaded, and when the judgment is not, the play command for the non-selected disk is canceled. It is characterized by comprising a control means.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a CD type disc record reproducing apparatus to which the present invention is applied will be described in detail below with reference to the drawings.

In other words, if two discs can be selectively played back in any format, Figure 1 shows double disc playback.
This figure shows a front external view of a CD player, in which A and B disk loading sections 110 and 111 of a horizontal loading type are provided on the left and right sides of the central front surface of a cabinet 100 so as to be openable and closable. These A and B disk loading sections 110,1
11 is equipped with an eject (EJECT) for opening and closing the A and B disk loading sections 110 and 111.
Keys 133 and 134 are provided, and A
and B-tray (A-TRAY, B-TRAY) indicators 135a, 135b and 1 to 12, respectively.
Channel A and B (track number) track number indicators 135g and 135h are provided.

Further, a power key 112 for connecting and disconnecting the power is provided at the bottom of the A disk loading section 110, and numeric keys 113 to 12 from 0 to 9 are provided.
2 and A-MEMORY key 1
23 are provided.

At the bottom of the B disk loading section 111 are a B-MEMORY key 124, a CLEAR key 125, a REPEAT key 126, and a repeat indicator 1.
35i is provided.

Additionally, a track number (TNo.) display 135 is provided on the top of the B disk loading section 111.
c. LAP display 135d, total recording time (TOTAL) display 135e, 4
A track number/time display 135f with a numerical display and a display (DISPLAY) key 127 are provided.

Furthermore, on the right side of the B disk loading section 111,
A and B playback (A-PLAY, B-PLAY) keys 128, 129, pause (PAUSE) key 13
0, an UP key 131 and a DOWN key 132 are provided.

FIG. 2 shows the electric circuit system of the double CD player shown in FIG.
34, the microprocessor 201 operates the disk playback system 20 (described later) via the input/output (I/O) interface 203.
2 to a predetermined state, and the display unit 135 including the above-mentioned displays 135a to 135i displays the necessary information.

That is, assuming that the disk 206 loaded in the A disk loading section 110 is to be played back, the disk playback system 202 will be driven in response to various control signals from the I/O interface 203. First, mechanical unit 2
When the disk motor 204 and pick-up feed motor 205 included in 00 are driven,
The pickup 207 is configured to reproduce the data recorded on the disk 206 and send the reproduced signal to the RF signal detection circuit 208.

Here, the RF signal detection circuit 208 is a matrix circuit, and has a function of separating the reproduced signal into a signal to be supplied to two servo circuits 220 and 221, which will be described later, and a signal to be supplied to a waveform shaping circuit 222. . Of these, focus servo circuit 22
1 provides a focus servo for the pick-up 207, and a tracking servo circuit 220 provides a tracking servo for the pick-up 270 and a linear tracking servo for the pick-up feed motor 205. It is designed to send out various controls for closing the screen.

The reproduced (RF) signal supplied to the waveform shaping circuit 222 is sent directly and via the phase-locked loop circuit 223 to the first RF signal, which mainly performs synchronization signal separation for address detection, EFM demodulation, and subcode decoding. is supplied to the signal processing circuit 224 of. Among these, the detected address signal is sent to the interface circuit 203 and the microprocessor 2 through the address signal bus 211.
If the data is table of contents (TOC) in the lead-in area on the disk 206, it is imported into the RAM 213 by the operation described below, and necessary control functions such as the search function are executed. It is offered for playing. Further, if it is address data (track number, time, etc.) in the program area on the disk 206, it can be used for necessary display.

Furthermore, the EFM demodulated playback signal is converted into a digital audio signal by a second signal processing circuit 226 that mainly performs necessary signal processing such as deinterleaving, error correction, and error correction in cooperation with the memory 225. At the same time, the signal is returned to an analog signal by the D/A conversion circuit 212, and then analog switches 215L and 21 for L/R channel separation are applied.
5R, low pass filter 216L, 216R,
De-emphasis control amplifier 217L,
It is designed to be used to drive the speakers 218L and 218R to produce sounds via the 217R.

Note that the ROM 214 is the microprocessor 20
Program data for driving 1 according to a predetermined program is written therein.

The functions of the disc reproducing system 202 as described above are performed in a similar manner to the discs loaded in the B disc loading section 111, and in this case, the above-mentioned mechanical unit 200
Mechanism A is controlled by the control signal from the I/O interface circuit 203.
The B disk loading section 1 is moved by the B movement motor 230.
It needs to be moved to the 11th side.

That is, an embodiment of the double CD according to this invention
The player is configured such that one disk-driven playback section can assume a predetermined playback mode as needed for two disk loading sections.

Note that in FIG. 2, the A and B disk loading sections 110 and 111 are
and B tray motors 231, 232, A and B disk sensors 233, 234, mechanical unit up and down motor 235, mechanical unit up and down limit switches 236, 237,
Mechanical unit position detection switches 238, 239 and A and B disk loading section open/close detector 24
0,241 is the I/O interface circuit 203
It is designed such that necessary control signals can be sent and received to and from the terminal.

Next, each key 113 to 134 and each display 135a to 135 described above based on FIG. 1 and FIG.
The functions that make i achievable will be explained.

<A-disk loading section eject key 133> If this key is operated during playback of a disk loaded in the A-disk loading section 110, the playback state is canceled, and the microprocessor 201 and interface circuit 203 After the disk motor 204 is stopped via the disk motor 204, the laser diode being picked up is turned off, and the pickup 207 is returned to the starting position, the disk loading section 110 is opened. Furthermore, when this key is operated while the disc loading section 110 is open, the disc loading section 110 is closed.

<B disk loading section eject (EJECT) key 134> Above A disk loading section eject (EJECT)
The B disk loading section 11 has the same function as the key 133.
1 is played.

<Number (0 to 9) keys 113 to 122> These are keys for inputting numbers, and are used to specify playback songs during a search (to find the beginning), and to write to and erase from memory.

<A.MEMORY key 123> Used to write or erase numerical key data to the A memory channel in the RAM 213.

<B MEMORY key 124> Used to write or erase numerical key data to the B memory channel in the RAM 213.

<CLEAR key 125> Track number display 1 displaying the above numerical key data
35f is used to display the original song number (address, time).

Note that if the A memory (AMEMORY) key 123 and the clear (CLEAR) key 125 are operated at the same time, the A memory all clear (AMEMORY
ALL CLEAR) is in working condition. In addition, B memory (BMEMORY) key 12
4 and the CLEAR key 125 are operated at the same time, the B MEMORY ALL CLEAR operating state is entered.

<REPEAT key 126> Repeat (repeated playback) is turned on and off each time this key is operated. However, the repeat function is off when the power is turned on.

<Display (DISPLAY) key 127> Each time this key is operated, the track number/time display 1
The display on 35f is switched from the track number and index number (T No.) to the elapsed time of one song (LAP TIME) and then to the synchronous recording time (RECORDING TIME).

<A・PLAY key 128> This key is used both when used alone and when
~9) There are cases where the keys are operated subsequent to the operations of the keys 113 to 122.

First, when used alone, if the state immediately before operating this key as a manual play mode is a pause state, the pause state is canceled and the A play state is entered.

When used in combination with number (0 to 9) keys 113 to 122, it becomes a search operation state,
After the search is completed, the A-play state is entered.

<B・PLAY key 129> This key operates in the same way as the A・PLAY key 128, but differs in that it finally enters the B play state.

<PAUSE key 130> If the state immediately before operating this key is the play state, the play state is canceled and the pause state is entered. Furthermore, if the operation is performed during a search operation, the pause state is entered after the search is completed.

If the state immediately before operating this key is a pause state, the pause state is canceled, the laser diode being picked up is turned off, and the stop state is entered.

<UP key 131> When this key is operated, a search operation is performed with the target address being the start address of the song corresponding to the T No. that has advanced by the number of times this operation section is pressed, and the search is resumed after the search is completed. Returns to previous mode.

<DOWN key 132> When this key is operated, the first operation will perform a search operation using the start address of the currently playing song as the target address, and after the search is completed, the mode will return to the mode before the search. . Furthermore, if operated during the search operation, the target address will be returned in units of T No., in contrast to the case of the up operation section 131 described above, the number of times this operation section is pressed.

<A-TRAY indicator 135a> Lights up when A-tray is selected.

<B-TRAY indicator 135b> Lights up when B-tray is selected.

<Track number (TNo.) display 135c> Lights up when the display mode of the track number/time display 135f is set to display the track number.

<LAP indicator 135d> Lights up when the display mode of the track number/time indicator 135f is set to display the elapsed time within one song.

〈RECORDING TIME
TIME) display 135e> Lights up when the display mode of the track number/time display 135f is [TOTAL] recording time display.

<Track number/time display 135f> This is a four-digit numerical display, and is designed to display the song number or time in response to the operation of the display key 127. That is, the two digits from the left represent the T No. when the song number is displayed, and the minutes and seconds when the time is displayed.

<A track number display 135g> In this case, it has 12 channels, and the channel number corresponds to the T No. If it has been memorized, the lamp corresponding to the memorized T No. is lit. During play, the lamp corresponding to the T No. being played flashes.

<B track number display 135h> The same operation as the A track number display 135g is performed for the B tray.

<REPEAT indicator 135i> Lights up when the repeat function is on.

And a double CD with the above functions
According to the player, by simply loading the desired disks into the A and B disk loading sections 110 and 111 in advance and specifying the desired playback format, continuous performance from one disk playback to the other disk playback (of course, each It is possible to play only the desired songs on the disc) or to perform endless performances by repeating them as many times as desired, making it extremely easy to use.

Next, a description will be given of control functions that are particularly taken into consideration in the embodiment of the double CD player as described above.

In other words, the control function here refers to a state in which after the playback operation for a disk loaded in either one of the A and B disk loading sections 110, 111 is completed, a playback command is issued to the other disk loading section. This is a control function that, when it is detected that no disk is loaded on the other disk loading side, cancels the reproduction command to the other disk loading side.

Such a control function is performed by the microprocessor 201 using the program written in the ROM 214 described above to control each part of FIG. 2 to a predetermined state as described below in accordance with the flowchart shown in FIG. It is carried out by doing.

First, in the steps in Figure 3, for convenience of explanation, A
It is assumed that after a playback command is issued to the disk loaded in the disk loading section 110 (hereinafter referred to as A disk), playback preparations such as a clamping operation for positioning the A disk are performed. is not limited to this. In the above step and the next step, by operating the A playback (PLAY) key 128, the A disk is played back by the mechanical unit 200 as a disk playback driving means. In this state, in the next step, a playback command to the disk loaded in the B disk loading section 111 (hereinafter referred to as B disk) is issued by the B playback (PLAY) key 129 or the aforementioned search operation and repeat operation. It is determined whether or not it has been given, and if NO, the above step is continued, and if YES, the process continues with the current state (disk A is being played) and proceeds to the next step. In this step, the microprocessor 201 takes in the detection signal from the B disk loading section opening/closing detector 241 shown in FIG. Determine whether or not there is. Since this determination essentially detects whether or not the B disk is loaded, the B disk sensor 234 may be used instead of the above-mentioned detector, or other means may be used. If the judgment result in the step is NO, that is, if the B disk loading section 111 is not closed (the B disk is not loaded), the playback command for the B disk is canceled and the playback command is not executed, and the process returns to the step. Return and continue playing the A disk. In addition, the judgment result at the step
If YES, that is, if the B disk loading section 111 is closed (B disk is loaded), proceed to step, stop the playback operation for the A disk, and then move the mechanical unit 200 to the B disk loading section 111.
It is moved to the disk loading section 111 side. In the next step, playback preparations such as a clamping operation for positioning the B disk are made, and then in the next step the playback operation for the B disk is started.

By providing the control functions described above, when there are consecutive play commands for two discs, the loading status of the disc to be played later can be detected while the disc to be played first is being played. If it detects that the disk is not loaded, or even if it is loaded, it is incompletely loaded, it cancels the playback command for the disk that should be played later. As a result, it is possible to encourage reliable loading of the disc and contribute to ensuring continuous performance, reduce unnecessary movement of the mechanical unit 200 as a disc playback drive means, and reduce the risk of malfunction etc. It is possible to ensure extremely favorable controllability and operability to prevent accidents from occurring.

It goes without saying that the present invention is not limited to the embodiments described above and illustrated, and that various modifications and applications can be made without departing from the gist of the invention.

〔Effect of the invention〕

Therefore, as detailed above, according to the present invention, it is possible to reliably perform advanced control functions with a simple configuration, especially in a disc record playback device that plays back a disc on which digitized data is recorded. This makes it possible to provide an extremely good disc record playback device that can contribute to improved operability.

[Brief explanation of the drawing]

Fig. 1 is a front external view showing an embodiment of a disc record playback device according to the present invention, Fig. 2 is a block configuration diagram showing an electric circuit system of the embodiment, and Fig. 3 is a main part of the embodiment. This is a flowchart for explaining functions. 113-134... Input operation keys, 135a-
135i...Various displays, 201...Microprocessor, 203...I/O interface circuit, 2
13...RAM, 214...ROM, 202...disk playback system, 110, 111...disk loading section, 2
00...Mechanical unit for disk playback drive.

Claims (1)

[Claims] 1. In a disk record playback device that plays back a disk on which a plurality of pieces of data to be played and their address data are both digitized and recorded, the first and second disk loading sections and the first and second disks are connected to each other. A disk playback driving means for selectively putting one of the disks loaded in the loading section into a playback driving state, and selecting which one of the disks loaded in the first or second disk loading section to play. a reproduction disk command means for giving a reproduction command to the disk reproduction drive means; a disk detection means for detecting whether a disk is loaded in the first and second disk loading sections; and a disk reproduction drive means. Detection from the disk detection means when a playback command is given to a non-selected disk by the playback disk command means when a disk loaded in one of the disk loading sections is selected. control means for determining whether or not the disk on the non-selected side is loaded based on the signal, and canceling the reproduction command for the disk on the non-selected side if the judgment is not made; A disc record playback device characterized by: