JPS6018858A - Disk data reproducer - Google Patents

Abstract

PURPOSE:To obtain a disk data reproducer which can start reproduction at and after the discontinuation or the head of a music which is stopped temporarily, by comparing the disk discrimination data read out of a disk with that written to a memory before discontinuation of reproduction, then the start of reproduction discontinuation of reproduction, then the start of reproduction is indicated from the position corresponding to the stored position data when the coincidence is obtained from said comparison. CONSTITUTION:A power supply switch 11 is switched to an ON state when the insertion of a disk is detected by a disk insertion detector 41 and then turned off when the disk is taken out. A reproduction part 4 is actuated by an indication of a control part 3 which revolves the disk, controls the pickup position and delivers a music signal. The part 3 consists of a CPU31 and a stand-by RAM32. The CPU31 receives the key input information from an operation part 1 and controls a motor part or a pickup part of the part 4 and also transmits the state under reoriduction to the part 1 for display. In addition, the CPU31 calculates the information received from the part 4 and controls the part 4. While the RAM32 stores the data by a power supply for RAM32 even while a power supply 11 is cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disc data reproducing apparatus for reproducing music data or image data stored on a disc such as a digital audio disc or a video disc.

Conventional configurations and their problems One of the major features of digital audio discs and video discs is that a desired location on the disc can be accessed in a short time. However, the drawback compared to cassette tapes is that playback can be interrupted and then restarted again.
11, the 1S playback cannot be resumed from where it left off.

Therefore, conventionally, the following methods have been adopted to avoid this drawback. First, the first method is to perform tracking as shown in FIG. 1 while playback is paused. In FIG. 1, the symbol represents a spiral recording track on the disc, and when a playback pause is detected, the playback device maintains the operating state and the same track [F
]) is repeatedly tracked and waits for the pause to be released. The second method is to maintain the disc and pickup position at the position Vj just before the pause when playback is paused, and to
This is a method of cutting IjA.

However, with the first method, it is not possible to shut off the main power to the disc playback device even when the disc is paused, which results in high power consumption. This is not desirable as a data reproducing device.

Further, in the second method, due to the eccentricity of the disk rotating mechanism system and the disk itself, there is no guarantee that when playback is restarted, the playback can be accurately resumed from where it left off.

Purpose of the Invention The present invention provides that even if playback is interrupted and the main power is turned off, when playback is restarted, the playback can be resumed immediately after the playback is interrupted or temporarily.

To provide a disc data r+T raw equipment that can accurately start playback from the beginning of a stopped song.

Composition of the Invention The disc data reproducing apparatus of the present invention includes a main power opening/closing means for turning off the main power to the disc reproducing apparatus main body during playback suspension, and a main power switching means that does not erase the stored contents even during a period in which the main power to the disc reproducing apparatus main body is turned off. A storage device, and when disc data playback is interrupted, disc discrimination data and playback position data are written to the storage device, and disc discrimination data read from the loaded disc when restarting playback is written to the storage device during playback. and a control device that instructs to resume playback from a position corresponding to the playback position data written in the storage device when a match is detected by comparing the included playback interruption own disk discrimination data. It is characterized by:

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 8. Note that a digital audio disc playback device will be explained here as an example.

First, the disc discrimination method will be described. The tracks on a digital audio disc are roughly divided into lead-in tracks, music tracks, and lead-out tracks.The lead-in track contains the catalog number of the disc and all songs on the music track. number, the start time of each song number (time based on the start time of the music track), etc. are recorded. Therefore, it can be seen that catalog numbers can be used to identify discs. However, the catalog number is not necessarily included in all discs. In this case, data that allows disc discrimination among other information in the lead-in track (that is, data that is unlikely to have the same data pattern on different discs) may be used as data for disc discrimination.

FIG. 2 shows a block diagram of a digital audio disc playback device in one embodiment of the present invention.

(1) is the operation unit, power switch 0]), display (6)
, brake, stop key, program entry key, entry clear key, program clear key, and other function keys 03, and a numeric keypad (14, etc.) for song number programming. (2) is the power supply section, and the power switch 0◇ In addition to converting and supplying the output power from the operating section (1), the control section (3) and the reproducing section (4) described later into the necessary power, the 1n input directly without passing through the power switch C11> Standby RAM in the control unit (3)
power supply and disc insertion detector 01 in the playback section (4)
).

The power switch θ is configured to be turned on when the disk insertion detector θ1) detects the insertion of a disk, and turned off when the disk is removed from the stack. The playback section (4) drives the disk rotation at
b. It is configured to output a music signal by performing pickup position control, pickup data extraction signal processing, etc., and operates according to instructions from the control section (3).

The control unit (3) is mainly composed of a CPU (including ROM) C (→ and standby RAM), and the CPU 6]) receives key manual information from the operation unit (1) and operates the playback unit. In addition to controlling the motor section or pickup section of (4), the playing status (for example, the currently playing track number, etc.) is transmitted to and displayed on the operation section (1), and the disc from the playback section (4) is It receives information regarding the content, performs arithmetic processing, and controls the playback unit (4). Meanwhile, standby R
The AMO transmits each data to standby from the power supply unit (2) even while the power switch 0 is disconnected.
Memory is retained by being supplied with power.

Next, the configuration of the control section (3) will be explained in detail with reference to FIG. 8 based on the operation sequence of the digital audio disc playback device configured as described above.

However, the following explanation simply shows only the operation sequence related to the present invention, and for example, the control sequence of the disk drive motor, pickup, etc. is omitted.

First, when the disk insertion detector θυ detects that a disk has been inserted and the power switch 0 is turned on, the pickup section first accesses the lead-in track and reads the lead-in track necessary for playback. In addition to reading and storing data in the in-trunk, it also reads specific data designated as discrimination data on the disk.

Next, it is determined from the control data in the standby RAM ea whether or not the current playback is due to a temporary interruption due to the disc being ejected, and if the playback is not due to a temporary interruption, the normal playback sequence is entered. Furthermore, when it is determined that the playback is to be restarted by the temporary 11Ji, the disc discrimination data written in the standby RAM @ at the time of the temporary suspension is compared with the disc discrimination data read this time. If a match is not detected in this comparison, the normal playback sequence begins, but if a match is detected, a check is made to see if a new operation instruction has been issued using the keys on the operation panel (]), and a new operation is performed. If an instruction is given, the instruction is followed by τiG and the normal playback sequence begins. In addition, when the play key of the operation unit (1) is operated when no new operation instruction is given, the data address to be restarted stored in the standby RAP (4) is accessed, After accessing the correct address, playback resumes.

In addition, if the configuration is such that the song number is memorized when the playback is interrupted, the playback is started from the beginning of the song as the position corresponding to the playback position data.

As described in the detailed description of the invention, the disc daily playback device of the present invention writes disc discrimination data and playback position data to the storage device when disc data playback is interrupted, and also writes disc discrimination data read from the loaded disc when playback is resumed. The data is compared with the disc discrimination data before playback interruption that was written in the previous W[, ', ν) to the storage device at the time of playback interruption, and if a match is found (・9 is output, the data is omitted in the storage device. Since a control device is installed that instructs playback to resume from the position corresponding to the playback position data, even if the main power to the disc playback device is turned off while playback is interrupted, when playback resumes, the playback will resume from the point where playback was interrupted or the beginning of the song. It is possible to start playback from the beginning, consumes low power, and is particularly effective as a disc data playback device for in-vehicle or portable devices.You can also remove the disc being played and reinsert it to resume playback. Even in such a case, playback can be resumed immediately after the previous playback was interrupted or from a well-defined section, and the advantages of conventional cassette tapes can be applied to discs, contributing to improved operability. .

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the tracking state during a pause operation of the disc, No. 21Δ is a configuration diagram of a digital audio disc player according to an embodiment of the present invention, and FIG. 8 is a flowchart of the operation sequence of the digital audio disc player. (1)...Operation unit, (2)...Power supply unit, (3)...
・Control unit, (4)...Reproduction unit, (11)...Illumination switch, ell)...CPU, ni)...RAM
. @No... Disc insertion detector agent Yoshihiro Morimoto

Claims (1)

[Claims] 1. A main power opening/closing means that turns off the main power to the disc playback device while playback is interrupted, a storage device that does not lose its stored contents even when the main power to the disk playback device is turned off, and Disk discrimination data and playback position data are written in the storage device, and the disk discrimination data read from the loaded disk when playback is restarted is compared with the disk discrimination data before playback interruption that is written in the storage device when playback is interrupted to match. a control device which instructs to restart playback from a position corresponding to playback position data written in the storage device when detecting the playback position data written in the storage device.