JPH04313876A - Information reproducing device - Google Patents

Abstract

PURPOSE:To improve the reliability of the operation by fixing a read-in means at a reproduction interruption position at the time of occurrence of reproduction interruption, detecting a reproduction position of the read-in means with a position detecting means and newly storing contents information from a medium with a contents information restoring means. CONSTITUTION:A system controller part 10 stops a carriage motor 5 by a servo part 8 at the time of a standby state and a pickup 4 is fixed at an interruption position and the reproducing operation is interrupted. Subsequently a controller 10 makes TOC information in the memory clear. When the standby is released, the controller 10 reads in the information on a CD 2, and detects the reproducing position of the present pickup 4, i.e., a last address. Subsequently the controller 10 drives a motor 4 with a servo part 8 and moves the pickup 4 to the most inner peripheral position of the CD 2 and the TOC information is again read in a memory. Thus the reproduction control can be performed with the latest TOC information and the reliability of the operation is improved.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an information reproducing device,
Especially CD (Compact Disc), LVD (La
The present invention relates to an information reproducing device capable of reproducing recording media such as serVision Disc).

0002

2. Description of the Related Art In a conventional CD player, when a new CD is set, TOC information (Table of Contents), which is recorded as control data, along with information to be reproduced on the CD before starting playback operation.
ts information) in the RAM (Random
The TOC information is read into the CD (Access Memory), and playback is controlled based on the read TOC information until the CD is ejected again.

[0003] In early CD players, operations such as turning off the main power supply during playback or turning off power supplies other than the control power supply using a remote control device caused the player to enter a standby state (
Hereinafter referred to as standby. ) or when the stop button was pressed, the pickup returned to the standby position on the innermost CD track. For this reason, unlike compact cassette tape players, it is not possible to immediately start playback from the interrupted position. To solve this problem, conventional CD players store information about the playback interruption position (hereinafter referred to as the last address) in RAM (
Random AccessMemory), etc., and before resuming playback next time, this stored last address is read and playback (hereinafter referred to as last address playback) is resumed from the playback interrupted position. (Unexamined Japanese Patent Publication No. 195391/1983, Unexamined Japanese Patent Publication No. 1983
(Refer to Publication No.-28081).

0004

[Problems to be Solved by the Invention] However, in conventional CD players, when performing last address playback after playback is interrupted, playback is controlled based on TOC information stored in memory at the time the CD is set. However, there is a fear that correct playback control may not be performed, for example, if part of the stored information in the memory is destroyed due to noise or the like during an interruption such as when the power is turned off. Furthermore, even though TOC information is not used when playback is interrupted, T
Because the OC information is stored even when playback is interrupted, it is necessary to have a nonvolatile memory or a memory that can be backed up. Furthermore, in order to perform playback from the point where playback was interrupted, it is necessary to additionally include a non-volatile memory or a memory that can be backed up to store the last address, resulting in a complicated configuration and increased cost. was there.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an information reproducing apparatus that has a simple configuration and is capable of reproducing the last address with high reliability.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention reads table of contents information recorded on a disc-shaped recording medium by a reading means and stores it in a storage means, and based on this stored table of contents information. The information reproducing apparatus reads and reproduces information recorded on the disk-shaped recording medium by the reading means, further comprising: a fixing means for fixing the reading means at a position where reproduction of the information is interrupted when reproduction of the information is interrupted; position detection means for detecting the reproduction position of the reading means when resuming reproduction after interruption; and table of contents information re-storage for newly reading the table of contents information from the disk-based recording medium and storing it again in the storage means after detecting the reproduction position. and a control means.

[0007]

According to the present invention, the fixing means fixes the reading means at the reproduction interruption position when information reproduction is interrupted. The position detection means detects the reproduction position of the reading means when reproduction of the information is resumed after the reproduction of the information is interrupted. The table of contents information re-storage control means newly reads the table of contents information from the disc recording medium after detecting the playback position and stores it again in the storage means.

[0008] Therefore, it is possible to control playback using the latest and highly reliable table of contents information at all times, and when information playback is interrupted, there is no need to memorize the information of the playback interrupted position and the table of contents information, and information playback can be resumed without having to store information about the playback interrupted position and table of contents information. Sometimes, playback can occur immediately from the point where playback was interrupted.

[0009]

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a basic configuration diagram of a CD player. CD
The player 1 rotates the CD 2 using a spindle motor 3. The pickup 4 is driven in the track direction by a carriage motor 5, reads recorded information on the CD 2, converts it into an RF (Radio Frequency) signal SRF, and outputs it to a preamplifier section 6. The preamplifier section 6 amplifies the RF signal SRF and outputs it to the decoder section 7 , and also generates a focusing error signal SFE and a tracking error signal STE and outputs it to the servo section 8 . The decoder section 7 converts the RF signal SRF into a binary signal, separates the frame synchronization pattern, and converts the RF signal SRF into an EFM (Eight
to Fourteen Modulation) and outputs it to the D/A converter section 9.
Generates the spindle motor error signal SSE and sends it to the servo unit 8.
Output to. The servo unit 8 controls the rotation speed of the spindle motor 3 using a PLL circuit (not shown) so that the linear velocity is constant according to the radial position of the CD 2 currently being read by the pickup 4 by a spindle servo circuit (not shown). Further, the servo section 8 controls the focal position of the objective lens of the pickup 4 by a focusing servo circuit (not shown), and drives the objective lens by a tracking servo circuit (not shown) to maintain the reading position at a predetermined track position. Further, the servo unit 8 drives the carriage motor 5 via a carriage servo circuit (not shown) to move and hold the entire pickup 4 at a predetermined position. The D/A converter section 9 converts the data sent from the decoder section 7 into an analog audio signal SAD and outputs it. The system controller unit 10 has a memory (not shown) that stores various data, and controls the entire CD player 1. The display operation section 11 displays the operating status of the CD player 1, the playback order, etc., and inputs various data.

Next, the last address reproduction will be explained with reference to the operation flowchart of FIG. In this case, it is assumed that TOC information has been read in advance into a memory (not shown) of the system controller unit 10. The system controller unit 10 performs normal playback (step S).
1) Always monitors whether or not the playback operation is interrupted by pressing down a stop button (not shown) on the display operation unit 11 during the process, or whether the playback operation is set to standby due to turning off the main power, etc. (step S2), and stops the playback operation. When the button is pressed down or the standby mode is activated, the system controller section 10 stops driving the carriage motor 5 via the servo section 8, fixes the pickup at the interruption position (step S3), and interrupts the playback operation.

Next, the system controller unit 10 clears TOC information in a memory (not shown) (step S
4). This is to accommodate memories that cannot be overwritten when rereading TOC information later, and to prevent playback control from being performed due to incorrect TOC information. Therefore, if an overwritable memory is used, this process can be omitted.

In the display operation unit 11, when standby is canceled by turning the power back on or the play button is pressed down, the system controller unit 10 drives the spindle motor 3 via the servo unit 8 to rotate the CD 2. do. When the rotation speed of the CD 2 reaches a predetermined rotation speed, the system controller section 10 reads information on the CD 2 via the pickup 4, preamplifier section 6, and decoder section 7, and determines the current playback position of the pickup 4, that is, the last address. Detect (step S5). More specifically, the second bit group of CD2 subcoding,
The current pickup position is detected by reading the so-called subcode Q and calculating the current track number, and the system controller section 10 stores this pickup position as the last address.

Next, the system controller section 10 drives the carriage motor 4 via the servo section 8, moves the pickup 4 to the innermost position of the CD 2, and reads the TOC information into the memory again (step S6). This allows playback control to be performed using the latest TOC information, improving reliability of operation. When the play button is pressed down, immediately thereafter, the system controller unit 10 drives the carriage motor 5 to move the pickup 4 to the interruption position based on the last address, and performs last address playback (step S7). . Furthermore, when the standby is canceled by turning on the power again, the last address is played back immediately after the play button is pressed down.

As explained above, according to this embodiment,
Since playback control is always performed using the latest TOC information, reliability is improved, and there is no need to store TOC information and last address when playback is interrupted, so it is possible to use non-volatile memory or backup storage for this purpose. There is no need to provide memory, which simplifies the configuration. In the above embodiment, the pickup enters the playback state immediately after moving to the track that is the playback position, but in order to absorb the discrepancy between the playback position and the actual interruption position, It is also possible to configure the playback to start while fading in from the position.

Further, in the above embodiments, only a CD player has been described, but the present invention can also be applied to other optical disc players such as an LVD player.

[0016]

According to the present invention, the table of contents information re-storage control means stores the table of contents information in the storage means again after the reproduction position of the reading means is detected, so that the table of contents information is always updated and highly reliable. This has the effect that playback control can be performed based on this, and reliability of operation can be improved. Furthermore, since there is no need to store table of contents information and information regarding the playback interruption position when playback is interrupted, the configuration of the information playback device is simplified and last address playback can be easily performed.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is an operation flowchart of the embodiment of FIG. 1;

[Explanation of symbols]

1...CD player 2...CD 3...Spindle motor 4...Pickup 5... Carriage motor 6...Preamp section 7...Decoder section 8...Servo part 9...D/A converter section 10...System controller section 11...Display operation section

Claims (2)

[Claims] 1. Table of contents information recorded on a disc-shaped recording medium is read by a reading means and stored in a storage means, and the reading means reads the information recorded on the disc-shaped recording medium based on the stored table of contents information. In the information reproducing apparatus that reads and reproduces the information, a fixing means fixes the reading means at the reproduction interrupted position when the reproduction of the information is interrupted, and a fixing means detects the reproduction position of the reading means when the reproduction of the information is restarted after the reproduction of the information is interrupted. a position detection means; a table of contents information re-storage control means for newly reading the table of contents information from the disk-based recording medium and storing it again in the storage means after the playback position is detected;
An information reproducing device comprising: 2. The information reproducing apparatus according to claim 1, further comprising erasing means for erasing the table of contents information from the storage means when the information reproduction is interrupted.