JPH0945054A - Information reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be able to automatically reproduce a data block of latest recording by comparing the data of dates of different tracks. SOLUTION: When UTOC exists in an inserted MD10, the manufacturer's code and unit type code of an MD recorder recorded at the last recorded in the address of the sector '0' of the UTOC area are read. When their codes match the codes of the MD recorder/player itself stored in a controller 20, the record date of respective tracks recorded at the address of a sector '2' are compared, the track of the latest recording is stored in the controller 20 and reproduced. On the other hand, at the time of discordance, the MD recorder manufacturer's code and unit type code of the track recorded with the address of the sector '2' are read, the matching of them with the codes of the recorder/ player itself is decided. When the entirety is mismatch, it is normally reproduced. When there is a matching track, the track of the latest record of the tracks is decided from the record date data of the address of the sector '2', stored in the controller 20 and reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reproducing apparatus for reproducing an information recording medium on which a recording date / time of a data block is recorded.

[0002]

2. Description of the Related Art Mini disc, one of information recording media
A data block from the start of recording to the end of recording (hereinafter referred to as MD) is called a track. When recording each broadcast to the same MD to learn a language in a language program and playing this MD before the next broadcast, the user wants to play the most recently recorded track at that time. . In MD, the order of the most recently recorded track is usually the last one. Therefore, when playing this track on the MD player, the user searches the last track in order from the first track, or directly searches the last track. Was specified and played.

[0003]

The MD has an area for recording the track order, and the track order can be easily changed by rewriting this area. Therefore, the last track is not always the most recently recorded track. Therefore, in the conventional MD player, even if the last track is specified, the latest recorded track cannot always be reproduced.

By the way, in the MD, data of the date and time when the track is recorded is recorded for each track. Therefore, by comparing the date and time data of two different tracks,
It is possible to determine the subsequently recorded track.
Therefore, the present invention focuses on the fact that it is possible to determine the data block recorded after two tracks, that is, the two data blocks, and determines the most recently recorded data block among all the data blocks. It is an object of the present invention to provide an information reproducing apparatus which automatically makes this judgment and reproduces the most recently recorded data block.

[0005]

An information reproducing apparatus according to the present invention comprises means for comparing the date and time when a data block was recorded and determining the most recently recorded data block from all the data blocks. And a means for reproducing the recorded data block, the data of the recording date and time for each data block recorded at a predetermined position of the information recording program is read out, and the most recently recorded data block from this recording date and time is read. It is judged and this data is reproduced.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a block diagram of the essential parts of the MD recorder / player of the present invention. Reference numeral 2 is an A / D conversion circuit for converting an analog signal input from the input terminal 1 into a digital signal, and the converted digital signal is input to the ATRAC encoder 3. The ATRAC encoder 3 compresses the input digital signal, encodes it with high efficiency, and inputs it to the CD-ROM encoder 4. The CD-ROM encoder 4 converts the input digital signal to CD-ROM format and
Input to M, ACIRC encoder 5 and shockproof memory 7.

EFM, ACIRC encoder 5 is the input CD-
A ROM format digital signal is interleaved, an error correction code is added, and a subcode signal is further added and input to the head drive circuit 6. The head drive circuit 6 converts the input digital signal into a signal for recording on the magneto-optical disk 10 and supplies it to the magnetic head 8. Also,
The shock proof memory 7 is connected to the CD-ROM encoder 4 and the CD-ROM decoder 13, and when writing is interrupted by an external shock to the MD recorder / player during the recording operation, during the interruption. The digital signals input from the CD-ROM encoder 4 are stored, and when the writing is restarted, the stored digital signals are collectively output to the CD-ROM encoder 4 to prevent the recorded information from being interrupted.

On the other hand, the pickup 9 heats the surface of the magneto-optical disk 10 above the Curie temperature for recording a digital signal by the magnetic head 8 and irradiates the surface of the magneto-optical disk 10 with laser light during reproduction. A digital signal is read from the reflected light and input to the reproduction HF (High Frequency) amplifier 11. The reproduction HF amplifier 11 converts the input digital signal into an EFM signal and inputs it to the EFM and ACIRC decoder 12.

The EFM / ACIRC decoder 12 extracts a subcode signal from the input EFM signal, corrects errors, deinterleaves it, converts it into a digital signal of CD-ROM format, and inputs it to the CD-ROM decoder 13. The CD-ROM decoder 13 converts the digital signal in the CD-ROM format into a digital signal before formatting and inputs it to the shock proof memory 7 and the ATRAC decoder 14.

The shock proof memory 7 stores a digital signal input from the CD-ROM decoder 13 in a pre-read state during the reproducing operation in such a manner that a larger amount than the actually reproduced amount is stored, and the shock is applied from the outside to interrupt the reading. During this period, the accumulated digital signal is output to the CD-ROM decoder 13 to prevent the reproduction signal from being interrupted. ATRA
The C decoder 14 expands the input digital signal, converts it into the original digital signal, and inputs it to the D / A conversion circuit 15.
The D / A conversion circuit 15 supplies an analog signal obtained by converting the input digital signal to a device such as a speaker or headphones connected to the output terminal 16.

Reference numeral 17 is a spindle motor for rotating the magneto-optical disk 10, and 18 is a thread motor for driving the pickup 9 in the radial direction of the magneto-optical disk 10. The motor control circuit 19 controls the spindle motor 17 and the sled motor 18 based on the tracking error signal output from the pickup 9.

The control circuit 20 operates in accordance with an instruction given by the user using the input keys 21, such as recording / playback / fast forward / fast reverse.
It controls the RAC encoder 3, the CD-ROM encoder 4, the CD-ROM decoder 13, the ATRAC decoder 14, and the motor control circuit 19. Further, the input key 21 is also an instruction to use the latest track playing function according to the present invention. The MD has a UTOC (User Table Of Contents) area for recording information such as disc and track names, start / end addresses of each track, date and time when the track was recorded, and model. Table 1 shows a part of the address map of the MD UTOC area.

[0013]

[Table 1]

The MD is stipulated by the standard to record the manufacturer code and model code of the MD recorder for which the recording was last performed in the address 7 of the sector 0 of the UTOC area shown in Table 1. The MD can record up to 255 tracks, and the date and time when each track was recorded and the manufacturer code and model code of the MD recorder are recorded in the sector 2 address.
It is stipulated to be recorded in 78 to 587.

FIG. 2 is a flow chart showing a processing procedure of a portion related to the present invention, which is performed by the above-mentioned MD recorder / player. MD recorder / player, when MD is inserted,
Unless the latest track playing function according to the present invention is in use
(S31) Normal playback is performed by sequentially playing back from the first track (S40). If the latest track performance function is used, determine whether the inserted MD has UTOC (S32).
, If the UTOC does not exist, that is, if the inserted MD is a MD for playback only, normal playback is performed (S40).

If the UTOC is present in the MD, the manufacturer code and model code of the MD recorder recorded last in the address 7 of sector 0 are read (S33), and these codes are read by the control circuit 20. If it matches the code of the MD recorder / player itself stored in (S34), it is the MD recorder / player or the same model that was recorded last, so that the addresses 78 to 587 of sector 2 are recorded. The recording date and time of each recorded track are compared and the most recently recorded track is stored in the control circuit 20 (S35). Then, the stored track is reproduced (S36).

On the other hand, if the code read from the MD in S34 does not match the code of the MD recorder / player itself, the manufacturer code of the MD recorder that recorded the tracks recorded at addresses 78 to 587 of sector 2. Then, the model code is read and it is determined whether or not the code matches the code of the MD recorder / player itself (S38). When no matching track exists, normal playback is performed (S4
0). If there is a coincident track, the most recently recorded track among the tracks is judged from the data of the recording date and time of the addresses 78 to 587 of the sector 2 and the control circuit
Store in 20 (S39). Then, the stored track is reproduced (S36).

The MD player is generally provided with a repeat playback function for repeatedly playing a designated track.
When this model is used in S36, the stored track is repeatedly played until the user gives a stop instruction. Although the MD recorder / player capable of recording and reproducing according to the embodiment of the present invention has been described in detail as described above, it is needless to say that the MD recorder / player for reproduction can also be used.

[0019]

As described above, according to the present invention, even when the order of data blocks is rearranged, the most recently recorded data block is determined by checking the data of the date and time when the data block was recorded. , It is possible to play this. As described in detail in the embodiments of the present invention, when the MD recorder / player according to the present invention reproduces an MD in which a program continuously broadcasted periodically is recorded every time, the MD recorder / player newly recorded at that time. It is capable of playing back recorded tracks, and is particularly suitable for playing MDs that record language programs.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part of an MD recorder / player according to the present invention.

FIG. 2 is a flowchart showing a processing procedure of an MD recorder / player according to the present invention.

[Explanation of symbols]

 11 Playback HF amplifier 12 EFM, ACIRC decoder 13 CD-ROM decoder 14 ATRAC decoder 15 D / A conversion circuit 16 Output terminal 20 Control circuit

Claims (1)

[Claims] 1. An information reproducing apparatus for reproducing an information recording medium in which the date and time when the data block is recorded is recorded for each data block, comparing the date and time when the data block is recorded, and selecting from all the data blocks. An information reproducing apparatus comprising: a means for judging the most recently recorded data block; and a means for reproducing the judged data block.