JP2002109818A - Disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk player capable of displaying disable of reproduction with respect to an ATRAC 3-compatible disk. SOLUTION: When this disk displayer judges that respective tracks mode of a mini-disk 1 are all of the ATRAC 3, the player informs a user of it that the disk cannot be played.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus for reproducing a mini disk or the like.

[0002]

2. Description of the Related Art A mini disc employs ATRAC as an audio compression technique.

[0003] In recent years, ATRAC3, which has about twice the compression performance of ATRAC, has been announced, and minidiscs using the compression technology have been commercialized.

[0004] ATRAC3 is an extension of ATRAC technology and uses a correlation between channels of a stereo signal to increase the compression efficiency of Joint Stereo.
Technology is adopted.

[0005]

SUMMARY OF THE INVENTION By the way, ATRAC
Since the compatible playback device cannot play back ATRAC3 data, the ATRAC3 data may be noisy or muted, for example. Sometimes.

[0006]

A disk reproducing apparatus according to the present invention is characterized in that the recording mode of each track is determined, and if the recording mode is not compatible with all tracks, it is notified that the disk cannot be reproduced. Things.

Further, the disk reproducing apparatus of the present invention is characterized in that the recording mode of each track is determined, and when a track that cannot be reproduced is reproduced, it is notified that the track cannot be reproduced.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a disk reproducing apparatus according to the present invention. The disk 1 is a mini disk. On this mini disc 1, a digital audio signal compressed by ATRAC or ATRAC3 is recorded. The recording signal of the mini disc 1 is reproduced by the optical pickup 2. The output signal of the optical pickup 2 is R
The signal is supplied to the EFM demodulation circuit 4 and the servo control circuit 5 via the F amplifier 3. The servo control circuit 5 performs focus control of the optical pickup 2 based on the supplied signal,
Perform tracking control. The EFM demodulation circuit 4 has an EFM
(8-14 modulation) and supplies a demodulated signal to the CIRC decoder 6 in the next stage. The CIRC decoder 6 has a C
The error correction processing by the IRC is performed. The signal subjected to the error correction processing is supplied to the DRAM 8 under the control of the memory controller 7. The DRAM 8 is called a shock-proof memory, in which a compressed digital audio signal is written for each sound frame, and
Read out for each sound frame. The compressed digital audio signal from the DRAM 8 is supplied to an ATRAC decoder 9. The ATRAC decoder 9 applies an inverse DCT to each of the left and right channels for digital audio data that has been divided into three, namely, high band, middle band, and low band.
Performs calculation and returns to the original time axis information. In addition, A of the present invention
The TRAC decoder 9 cannot decode the digital audio data of ATRAC3. ATRA
Output data of the C decoder 9 is supplied to a D / A conversion circuit 10 and converted into an analog audio signal. The analog audio signal is output from the output terminal 11.

The system controller 12 comprises a microprocessor, and controls the servo control circuit 5, the memory controller 7, and the display 14 based on data from the CIRC decoder and an instruction signal from the key circuit 13.

A track mode is recorded for each track in the TOC and the U-TOC so that the next mode can be distinguished.

ATRAC3 LP4 Stereo ATRAC3 LP2 Stereo ATRAC Mono ATRAC Stereo Therefore, by checking the track mode of each track, it is possible to determine whether the audio data of the mini-disc is ATRAC-compatible or ATRAC3-compatible.

FIG. 2 is a flowchart of a main part program written in the system controller 12, and the operation will be described below based on the flowchart.

First, when the detection means (not shown) detects that the mini disc 1 is mounted on a turntable (not shown), the system controller 12 rotates the mini disc 1 and reads the TOC or U-TOC (S).
1). By reading the TOC or U-TOC, the start and end addresses of each track, the track mode of each track described above, and the like can be known. The system controller 12 stores these data in the internal memory.

Thereafter, the apparatus waits in a stopped state until the reproduction key of the key circuit 13 is operated, and when the reproduction key is operated, the track mode of each track is determined, and all the ATRs are determined.
In the case of AC3, the display 14 displays “No Support”.
"Disc" is displayed to notify that the disc cannot be reproduced (S11). In this case, the playback is stopped and the ejection process is awaited. When the eject key of the key circuit 13 is operated, the clamp of the mini disc 1 is released and the mini disc 1 is ejected to the outside of the apparatus (S12, S1).
3). If all the tracks are not ATRAC3, the process proceeds to the reproduction process of the mini disc 1 (S5). At first, the reproduction is started from track 1, but when the change key of the key circuit 13 is operated, the track to be reproduced is changed according to the operation (S6, 7).

The track mode of the track to be reproduced is determined.
"No Support Track" is displayed on the
Display that the track cannot be reproduced (S1
4). Then, mute processing is performed on an amplifier (not shown) to prevent noise or the like from being generated, and reproduction is advanced in that state (S15).

Therefore, all tracks are ATRAC
If it is not 3, the track of ATRAC performs normal reproduction without being muted.
As described above, the track C3 indicates that the track cannot be reproduced, and the reproduction proceeds while muting is applied.

When the eject key of the key circuit 13 is operated during reproduction, the reproduction of the mini disk is stopped and the disk is ejected to the outside of the apparatus.

In the above embodiment, when all the tracks on the mini disc 1 cannot be reproduced, the reproduction is stopped and the ejection waits. However, the reproduction may be performed while muting is applied. The ejection may be automatically performed without waiting for the ejection operation.

In the above embodiment, if all the tracks are not ATRAC3, the tracks of ATRAC3 are reproduced to the end of the track while muting them. You may make it jump.

[0021]

As described above, according to the present invention, a disc that cannot be reproduced is notified to that effect.
An easy-to-use disk reproducing device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram of a disk reproducing apparatus according to the present invention.

FIG. 2 is a flowchart of a main part program written in a system controller of the disk reproducing apparatus of the present invention.

[Explanation of symbols]

 1 mini disk 9 ATRAC decoder 12 system controller 14 display

Continuation of the front page F term (reference) 5D044 BC04 CC06 DE03 DE12 DE17 DE23 DE29 DE39 EF05 FG18 GK08 GK12 5D066 HA01

Claims (2)

[Claims] 1. A disc reproducing apparatus for reproducing a disc in which a recording mode of each track is written, wherein the recording mode of each track is determined, and if the recording mode is not all compatible, the disc cannot be reproduced. A disk reproducing device for providing notification. 2. A disc reproducing apparatus for reproducing a disc in which a type of a recording mode of each track is written. If a recording mode of each track is determined and a track that cannot be supported is reproduced, the track cannot be reproduced. A disc reproducing device for notifying the user of the information.