JP2004127332A - Mini disc reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is impossible to display the group names or change the names of the groups for reproducing if only a single error is found in the format of the group information data when reproducing a mini disk in a mini disk reproducing device conforming the MD group standards, and further make it possible to display the group names or to change the names of the groups for reproducing. <P>SOLUTION: A control circuit 18 is provided to recognize the data between two continuing slashes (//) as a group in the group information data if they satisfy [the format that the first and the last track numbers are put between two hyphens (-) and the track numbers and the group name are separated with semicolons (;)], but if not, to neglect them without recognizing them as a group. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an MD group compatible mini-disc reproducing apparatus.
[0002]
[Prior art]
An MD (mini-disc) is a magneto-optical disc for recording digital audio signal data compressed by an audio compression technology ATRAC (Adaptive Transform Acoustic Coding), and can record about 80 minutes of digital audio signal data. The recently established MDLP (mini-disc long play) can record digital audio signal data for about 320 minutes (PL4 mode at 66 kbps) using the audio compression technology ATRAC3 (for example, see Patent Document 1).
[0003]
In the MD, a disc name (eg, genre) and a track name (song name) can be recorded in a group information area on UTOC (User's Table Of Contents). Since MDLP can record about four times as much data as a CD (compact disc), hierarchical information for dividing a track into a plurality of groups (for example, singer names) has been added to the disc name.
[0004]
The format is as follows: "The first and last track numbers belonging to each group are sandwiched by single-byte hyphens (-), and each group in which the track number and group name are separated by a single-byte semicolon (;) It is added after the disc name, sandwiched by half-width slashes (//). "
[0005]
[Patent Document 1]
JP-A-2002-163880 (page 2)
[0006]
[Problems to be solved by the invention]
However, when an MD recorded by a mini-disc recording device that supports the MD group standard is displayed on a mini-disc recording device that does not support the MD group standard, the disc name is displayed in order to edit the disc name. Information is also displayed. It is conceivable that the group information is erased or partially changed by editing the disc name at this time. If it is partially changed, it may be rewritten in the wrong format.
[0007]
Conventionally, when playing a mini-disc with a mini-disc reproducing apparatus conforming to the MD group standard, "the first and last track numbers belonging to each group are sandwiched by half-size hyphens (-), and the space between the track number and the group name is half-size. If there is at least one error in the format of adding each group separated by a semicolon (;) between two consecutive half-width slashes (//) and after the disc name, all groups are ignored. Was. Therefore, it was impossible to display the group name or change the group to be reproduced at all.
[0008]
[Means for Solving the Problems]
The mini-disc reproducing apparatus of the present invention has been made in view of such a point, and the data sandwiched between two consecutive half-width slashes (//) of the group information data is “the first and last track numbers are expressed by a half-width hyphen (-). Control means for recognizing a group as a group if it satisfies the format of separating a track number and a group name with a half-size semicolon (;), and ignoring it as a group otherwise. Is provided.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. According to the present invention, key operations registered in advance are automatically executed according to the current position. FIG. 1 is a block diagram showing a configuration of a main part of the embodiment.
[0010]
When reproducing a digital audio signal recorded on the MD (1), a compressed magneto-optical disk housed in a cartridge of the MD (1) rotated by a spindle motor (3) on a turntable (2). The digital audio signal data is read by the pickup (4), passed through the amplifier (7), and demodulated by the EFM / ACIRC encoder / decoder (9) into EFM and CIRC. The address decoder (8) demodulates an ADIP signal recorded in advance in the MD (1) to obtain an address signal and inputs the address signal to the EFM / CIRC encoder / decoder 10. The memory controller (11) for earthquake resistance stores compressed data from the encoder / decoder (9) of EFM / CIRC in the RAM (12), encodes / decodes sector format signals, error data of main data, buffer control, It has data control functions such as external input / output control.
[0011]
Next, the ATRAC encoder / decoder (13) reads out the compressed data, inputs it to the decompression circuit, demodulates the data, sends the demodulated data to a D / A (digital-analog converter) (15), and sends the analog audio signal. Convert to The converted analog audio signal is output to an audio signal output terminal.
[0012]
Next, when an audio signal is recorded on the MD1, an analog audio signal input from an audio signal input terminal is converted into digital data by an A / C (analog-digital converter) (14), and furthermore, an ATRAC encoder / decoder is used. The data is converted into compressed data in (13) and stored in the RAM (12) via the memory controller (11) for earthquake resistance. After the storage amount of the RAM (12) reaches a certain amount, the stored compressed data is recorded on the MD (1). That is, the compressed data from the RAM (12) is read out by the memory controller for earthquake resistance (11) and output to the EFM / CIRC encoder / decoder (9). The output is output to a magnetic head drive circuit (17) after performing CIRC modulation. The magnetic head drive circuit (17) generates a perpendicular magnetic field in the magnetic head (16) in accordance with the EFM signal data for recording the direction of the current flowing through the magnetic head (16). At the same time, a laser output from the pickup (4) through the servo control circuit (6) under the control of the control circuit (18) is output and irradiated to the MD (1), and a digital signal is generated by the interaction between the vertical magnetic field and the laser. Is recorded.
[0013]
Also, a control signal for the feed movement of the pickup (4) is applied from the system controller 13 to the motor section (3) via the servo circuit (6). The control circuit (18) is composed of a computer or the like, and controls the recording, reproduction, and control of search operations of the optical pickup (4), a servo circuit (6), an EFM / CIRC encoder / decoder (9), And is connected via a bus to each section of the memory controller (11) for sending and receiving control signals. The operation unit (22) is a device for performing an input operation of the control circuit (18), and the display unit (21) is a device such as a liquid crystal for displaying various data from the control circuit (18).
[0014]
Next, the recording area of the MD will be described. As shown in FIG. 2, in the MD standard, there is a group information area for recording group information and a track information area for recording track information on the disk information on the UTOC. The track information describes the total number of tracks and the reproduction time of each track.
[0015]
In the group information, group information data describing a disc name, each group name, and a track number belonging thereto are recorded. As shown in FIG. 3, the group information data includes "each of the first and last track numbers belonging to each group sandwiched between single-byte hyphens (-), and the track numbers and group names are separated by single-byte semicolons (;). A group is written between two consecutive half-width slashes (//) followed by a disc name. For example, if the group information data is “0; concert A / 1/3; singer A / 4-7; singer B // 8-10; singer C”, the disc name is “concert A”, Track numbers 1 to 3 are group names “Singer A”, track numbers 4 to 7 are group names “Singer B”, and track numbers 8 to 10 are group names “Singer C”.
[0016]
However, when an MD recorded by a mini-disc recording device that supports the MD group standard is displayed on a mini-disc recording device that does not support the MD group standard, the disc name is displayed in order to edit the disc name. Information is also displayed. It is conceivable that the group information is erased or partially changed by editing the disc name at this time. If it is partially changed, it may be rewritten in the wrong format.
[0017]
Conventionally, when playing a mini-disc with a mini-disc reproducing apparatus conforming to the MD group standard, if there is any error in the group format of the group information data, all groups have been ignored. Therefore, it was impossible to display the group name or change the group to be reproduced at all.
[0018]
In addition, a minidisk recording device that does not conform to the MD group standard can rewrite track information in the track information area when adding / deleting a track, but cannot rewrite group information data in the group information area. Therefore, for example, as shown in FIG. 3, an MD whose group name is “0; concert A // 1-3; singer A // 4-7; singer B // 8-10; If track number 8 is deleted from a non-compliant mini-disc recorder, the group name will be "0; Concert A // 1-3-3; Singer A // 4-7; Singer B // 8-10; Singer C" As it is, the track information becomes an MD having a total track number of 9.
[0019]
When this is read by a mini-disc reproducing apparatus conforming to the MD group standard, the total number of tracks is 10 in the group information area, and the total number of tracks is 9 in the track information area. In this case, the track 10 cannot be reproduced.
[0020]
Next, the operation of the present invention will be described. FIG. 4 is a flowchart showing the operation of the control circuit (18). When the end of the group information data is not "//", the control circuit (18) adds "//" to determine the group (N in S1, S2). Note that even if "//" is missing at the end, "the first and last track numbers belonging to each group are sandwiched between single-byte hyphens (-), and the track numbers and group names are separated by single-byte semicolons (;). There is no hindrance to the determination (S5) of "format".
[0021]
The control circuit (18) determines whether or not the format of the selected character string is correct for each character string (ie, group) sandwiched between “//” of the group information data (S3, S4, S9). Specifically, it is determined whether or not “the format in which the first and last track numbers belonging to each group are sandwiched by single-byte hyphens (-) and the track numbers and group names are separated by single-byte semicolons (;)”. Check (S5).
[0022]
If the format is not correct (N in S5), for example, if there is no ";" between the track number and the group name, the character string is ignored without being recognized as a group (S6).
[0023]
If the format is correct (Y in S5), it is checked whether or not the track number is written in the track information in the track information area (S7).
[0024]
If it is written in the track information in the track information area (Y in S7), it is determined that a track exists, and the character string is recognized as a group (S8). If the track information is not written in the track information area (N in S7), it is determined that the track does not exist, and the character string is ignored without being recognized as a group (S6).
[0025]
【The invention's effect】
Conventionally, when playing a mini-disc with a mini-disc reproducing apparatus conforming to the MD group standard, if there is any error in the group format of the group information data, all groups have been ignored. Therefore, it was impossible to display the group name or change the group to be reproduced at all.
[0026]
The present invention recognizes groups that have the correct format. Even if the format is correct, the content may not be correct, but it can be used as a reference. In addition, operations on a group basis, such as changing a group to be reproduced, can be performed.
[0027]
However, the group of the track number that cannot be reproduced is not recognized as compared with the information in the track information area.
[0028]
Even if “//” is missing at the end of the group information data, the number of recognizable groups increases because it is recognized as a group.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a main configuration of an embodiment of the present invention.
FIG. 2 is a diagram showing a group information area and a track information area.
FIG. 3 is a diagram illustrating a method of describing a group name in a group information area.
FIG. 4 is a flowchart showing the operation of the main part of the present invention.
[Explanation of symbols]
1 MD
18 Control circuit 21 Display

Claims (3)

"The first and last track numbers belonging to each group are sandwiched by single-byte hyphens (-), and each group in which the track number and the group name are separated by a single-byte semicolon (;) is divided into two consecutive single-byte slashes (/ In a mini-disc reproducing apparatus conforming to the MD group standard, the group information can be read from a mini-disc having a group information area in which group information data of "format to be added after a disc name sandwiched by /) is written. ,
A mini-disc whose group has been rewritten by a mini-disc recording device that displays the group information data including a group when displaying the disc name because the disc name does not conform to the MD group standard conforms to the MD group standard When reading on a playback device,
The data between the two consecutive half-width slashes (//) of the group information data is described as "The first and last track numbers are sandwiched by half-width hyphens (-), and the half-width semicolon (;) is inserted between the track number and the group name. A mini-disc reproducing device comprising a control means for recognizing a format delimited by "" as a group if it is satisfied, and ignoring it as a group if not satisfied. 2. The mini-disc reproducing apparatus according to claim 1, wherein when the end of the group information data is not two consecutive half-width slashes (//), the control information is added to recognize the group. . The control means may determine that the data sandwiched between two consecutive half-width slashes (//) of the group information data in the group information area is “the first and last track numbers are sandwiched by half-width hyphens (−), If the name does not match the track number in the track information area, the data is ignored without recognizing it as a group, even if it satisfies the format of separating names with a half-size semicolon (;). The mini-disc reproducing apparatus according to claim 1.

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