JP2001167501A - Portable disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption by minimizing a turn-on time of a backlight of a display part when a CD is reproduced with an internal power source. SOLUTION: This device is provided with a control circuit 11 turning off the display part after character information related to the music to be reproduced next is displayed for a prescribed time when the CD is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable disk reproducing apparatus for displaying character information on music in a CD mode.

[0002]

2. Description of the Related Art Many navigation devices and DVD players currently on the market can play CDs. For this purpose, the display unit of the navigation device or the DVD player displays not only images such as maps and videos, but also characters related to songs.

A description will be given of character display relating to a song. CD
TOC (Tabl)
e Of Contents) information is recorded.
The P channel is a cueing signal of each song, and 1 is recorded in a pause period (2 to 3 seconds) of each song, and 0 is recorded in other periods. In the subcode of the Q channel, a track number, time information assigned to each track number, and the like are recorded as mode 1.

[0004] Further, there is a CD of the CD-TEXT standard, and subcodes of the R to W channels in the lead-in area include an album title related to the CD,
Character information about the disc, such as an artist name and a song title, is recorded as mode 4. In addition, CD-TE
The XT information is also recorded in the program area as mode 2, and is read out at the timing determined by the CD maker.

By reading the sub-codes of the P to W channels, it is possible to display the performance time of the music to be reproduced next, the artist name, the title of the music, and the like (see Japanese Patent Application Laid-Open No. 6-275011).

[0006]

However, there are portable navigation devices and DVD players. Conventionally, the display section is always lit even when characters related to music are displayed. It was getting shorter.

[0007]

SUMMARY OF THE INVENTION The portable disk reproducing apparatus of the present invention has been made in view of the above point. When a CD is reproduced, character information relating to the next reproduced music is displayed for a predetermined time. Control means for turning off the display unit later is provided.

The display device further includes a display key, and control means for turning off the display unit after displaying character information relating to the music for a predetermined time when the display key is operated when the CD is reproduced.

The power supply detecting means for detecting whether the power supplied to the apparatus is an internal power supply or an external power supply is provided, and the control means controls the turning off of the display unit based on the power supply detecting means. .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described. The portable disk reproducing device of the embodiment is a portable DVD player, and can reproduce a video such as a movie or karaoke recorded on a DVD. Further, it is also possible to reproduce a song or characters related to the song recorded on a CD. As the power source, not only the internal power source of the rechargeable battery but also an external power source of AC100V (commercial power source) can be used.

FIG. 1 is a block diagram showing a main part of a portable disk reproducing apparatus according to the present invention. (1) is an optical disk (1) of DVD or CD. (2) is a turntable, which holds the optical disk (1). (3) is a motor section composed of a spindle motor, which rotates the turntable (2).

An optical pickup (4) having a lens (not shown) reads information written on the optical disc (1). (5) is a pickup moving means for moving the pickup in the radial direction of the optical disk (1) based on a control circuit (11) described later. An amplifier (6) amplifies information read from the pickup. (7) is a signal processing circuit (DSP) that demodulates a signal read from the pickup and amplified.
First digital processing including error detection and correction processing, and second digital processing including demodulation processing, error detection and correction processing, and extraction of address information (time information) using the RAM (8). Or

A servo circuit (9) for the pickup (4) performs focus servo and tracking servo of the pickup (4) based on a control circuit (11) described later. More specifically, the control circuit (11) calculates a focus error or a tracking error based on a signal read from the optical disk (1), and controls the servo circuit (9) to change the focus or move the tracking. The movement of the tracking by the servo circuit (9) is a small range that can be moved in the pickup (4), and the movement of the tracking by the pickup moving means (5) corresponds to the entire area of the optical disk (1) where the information is written. It is a large area that moves in the radial direction.

Reference numeral (10) denotes a servo circuit for the motor unit (3), which controls the rotational speed of the motor unit (3) based on frequency information reproduced from the optical disk (1) so that the rotation speed becomes a specified speed. The rotation control is such that the optical disc (1)
For VD, ZCLV (Zoned Constant Linear Veloci)
ty) control, and if the optical disc (1) is a CD, CA
This is V (Constant Angle Velocity) control.

A control circuit (11) is composed of a microprocessor, a ROM and a RAM, and controls each section by a signal from an input section (12) and a signal from a power supply switching section (13) for switching between an external power supply and an internal power supply. I do. Input section (1
2) a display key (12) for performing a character display operation related to the music;
1).

The power supply switching section (13) supplies internal power to the apparatus when no external power is supplied, and supplies DC power slightly higher than the voltage of the internal power when external power is present.
The voltage is converted into a voltage and supplied to the device, and the internal battery is charged. Then, the control circuit (11) controls the power supply switching unit (1).
3) By detecting the voltage supplied in the apparatus, it is determined which power is being supplied.

The control circuit (11) separates the signal input from the signal processing circuit (7) into image data and audio data. (14) is a decoder, which outputs a signal from the control circuit (11) separated into image data and audio data,
Each is decoded by the MPEG method using the RAM (15). Reference numeral (16) denotes an audio / image processing unit, which converts an image signal and an audio signal from the decoder (14) from digital to analog signals, and displays an image or music on a display unit (161) in the audio / image processing unit. Display text information and generate sound. The display unit (161) is composed of a liquid crystal display having a backlight, and blinking of the backlight is performed based on the control of the control circuit (11).

Next, the operation of the present invention will be described. FIG. 2 is a flowchart showing the operation of the main part of the control circuit (11). The control circuit (11) checks whether data on the disk can be read under predetermined data reading conditions.
Discriminates whether the disc (1) to start reproduction is a CD or a DVD (S1, S2).

When reproducing a DVD (Y in S2), the backlight of the display unit (161) is always turned on (S2).
3, S4). At this time, an image is displayed.

When playing back a CD (Y in S1), if the internal power is not supplied (N in S5), that is, if external power is supplied, the display unit (16) is always displayed.
The backlight of 1) is turned on (S6, S7). At this time, characters related to the music are always displayed.

If the internal power is supplied (Y in S5), the control circuit (11) turns on the backlight for a predetermined time (for example, 10 seconds) before reproducing the music (Y in S8, S9, S10). , S11). The characters related to the song are displayed during the predetermined time, and when the predetermined time has elapsed, the backlight is turned off and the characters are not displayed.

If the internal power is supplied (S5)
Y), the control circuit (11) turns on the backlight even when the display key (121) is operated (Y in S12, S9, S10, S11). The characters related to the song are displayed during the predetermined time, and when the predetermined time has elapsed, the backlight is turned off and the characters are not displayed.

As described above, when a CD is reproduced by the internal power supply, the lighting time of the backlight of the display unit is minimized to reduce power consumption.

The present invention is not limited to the portable DVD player of the embodiment, but can also be applied to a portable navigation device or the like that can reproduce images such as maps and television images and can also reproduce CDs.

[0025]

As described above, the present invention relates to a device for displaying an image such as a DVD player or a navigation device, and a portable disk reproducing device for displaying characters related to a CD. At the time of reproduction, the lighting time of the backlight of the display unit can be minimized to reduce power consumption.

[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 main operation of the embodiment.

[Explanation of symbols]

 11 Control Circuit 13 Power Switching Unit 121 Display Key 161 Display Unit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiaki Maeda 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture F-term in Tottori Sanyo Electric Co., Ltd. 5D066 CA07 CA13

Claims (3)

[Claims] 1. A portable disc reproducing apparatus having a display unit for displaying an image when reproducing a disc on which an image such as a map or a video is recorded and displaying character information relating to a tune when reproducing a CD. A portable disk reproducing apparatus, comprising: control means for displaying character information relating to a music to be reproduced next for a predetermined time when a CD is reproduced, and then turning off a display unit. 2. A portable disk reproducing apparatus having a display unit for displaying an image when reproducing a disk on which an image such as a map or a video is recorded, and displaying character information relating to a tune when reproducing a CD. The apparatus further comprises a display key, and control means for turning off the display unit after displaying character information relating to the music for a predetermined time when the display key is operated when the CD is reproduced. Portable disc player. 3. A power supply detecting means for detecting whether the power supplied to the apparatus is an internal power supply or an external power supply, wherein the control means controls the turning off of the display unit based on the power supply detecting means. 3. The portable disk reproducing device according to claim 1, wherein