JP2004095041A - Mini disc player - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display a plurality of group names and first and last track numbers belonging to each group even when the total number of tracks of a group information area and the total number of tracks of a track information area are different from each other regarding an MD group compatible minidisk player. <P>SOLUTION: When a track number written in a group information area is different from the total number of tracks written in a track information area, the difference of a last track number written in the group information area from the total number of tracks written in the track information area is displayed, and a plurality of group names read from the group names of the group information area, and first and last track numbers belonging to each group are displayed. <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) by the audio compression technology ATRAC3 (see Japanese Patent Application Laid-Open No. 2001-163880).
[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 data about four times as large as a CD (compact disc), hierarchical information for dividing tracks into a plurality of groups (for example, singer names) is added to the disc name (MD standard Rainbow). Book).
[0004]
[Problems to be solved by the invention]
However, when an MD recorded by a mini-disc recording device compatible with the MD group standard is edited by a mini-disc recording device not supporting the MD group standard, the track information in the track information area is rewritten, but the track information in the group information area is rewritten. There is an inconsistency that the group (for example, singer's name) information is not rewritten because it has a format with an added hierarchy.
[0005]
Therefore, conventionally, when the track information in the track information area and the track information in the group information area do not match, the display of the group information is ignored as a mismatch and is not performed at all. For this reason, the user could not know the information of the song about the group at all.
[0006]
[Means for Solving the Problems]
The mini-disc reproducing apparatus of the present invention has been made in view of such a point. When the last track number written in the group information area is different from the total number of tracks written in the track information area, the mini disc reproducing apparatus is written in the group information area. Indicates that the last track number is different from the total number of tracks written in the track information area, and displays the group names read from the group name in the group information area and the first and last track numbers belonging to each group. indicate.
[0007]
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.
[0008]
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.
[0009]
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.
[0010]
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.
[0011]
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).
[0012]
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. As shown in FIG. 3, the group information records a disk name, each group name, and a group name describing a track number belonging to the group name. If the group name is, for example, "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”. The track information describes the total number of tracks and the reproduction time of each track (see JP-A-2000-105968).
[0013]
A minidisk recording device that does not conform to the MD group standard can rewrite track information, but cannot rewrite a group name or the like. 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 the track number 6 is deleted from the non-compliant mini-disc recording device (see FIG. 4), the group name is "0; concert A / 1 / 3-3; singer A / 4-7; singer B // 8-. 10; the singer C "remains, and the track information becomes an MD having a total of 9 tracks.
[0014]
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.
[0015]
Therefore, the control circuit (18) of the present invention, when reading with a mini-disc reproducing device conforming to the MD group standard, the last track number written in the group information area is different from the total number of tracks written in the track information area. At the time, as shown in FIG. 5, the information display of the group name "group name: concert A // 1-3-3; singer A // 4-7; singer B // 8-10; singer C""here, concert A Is the name of the disc. "And" (Note) There is an error in the total number of songs. " As a result, the user can understand that the song number obtained by removing the disc name from the group name has an error and is a reference display. Even if there is a discrepancy between the track numbers, the MD (1) is reproduced based on the track information, so that the user can listen to the music and determine the wrong track number.
[0016]
Also, as shown in FIG. 6, "the total number 10 of the following songs is incorrect, and is correctly 9.""Reference: 1-3 is singer A / 4-7, singer B / 8-10 is singer C," and so on. An error display may be performed. Even in this case, by displaying the information of the incorrect group name, the user can refer to the information.
[0017]
【The invention's effect】
According to the present invention, when the last track number written in the group information area is different from the total number of tracks written in the track information area, a plurality of erroneous group names and first and last track numbers belonging to each group are provided. Is displayed. In the related art, the group information in which the error occurred is ignored and is not displayed at all. However, since the MD is reproduced based on the track information, the present invention displays the information so that the user can refer to it. be able to.
[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 flowchart 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 diagram showing track information rewritten by an MD recording device that does not conform to MDLP.
FIG. 5 is a diagram showing an example of an error display.
FIG. 6 is a diagram showing another example of an error display.
[Explanation of symbols]
1 MD
18 Control circuit 21 Display

Claims (1)

A group information area in which a group information area in which a plurality of group names and a group name describing the first and last track numbers belonging to each group are written, and a track information area in which a total number of tracks are written, In a mini disc reproducing apparatus conforming to the MD group standard capable of reading the name and the total number of tracks in the track information area,
The total number of tracks in the track information area was rewritten by a mini-disc recording device which could rewrite the total number of tracks in the track information area but did not rewrite the group name in the group information area without complying with the MD group standard. When reading a mini disc with a mini disc playback device conforming to the MD group standard,
When the last track number written in the group information area is different from the total number of tracks written in the track information area, the last track number written in the group information area is written in the track information area. A mini-disc reproducing apparatus for displaying that the number differs from the total number of tracks, and displaying a plurality of group names read from the group names in the group information area and the first and last track numbers belonging to each group.

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