JPH11296862A - Disk medium reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the sound start fast at the reproducing start time without causing a sound brake in the top of a piece of music. SOLUTION: Whether or not the length that the musical data are continuously recorded from a reproducing start position is a prescribed length or longer is investigated referring to UTOC information, and when it is the prescribed length or below, after the musical data of the time length (t) of an extent that the sound brake doesn't occur are written in a shockproof memory 21b, the musical data are read out from the shockproof memory in order of reproducing to be reproduced, and when it is the prescribed length or above, after the musical data of the minute time length shorter than the time (t) are written in the shockproof memory 21b, the musical data are read out from the shockproof memory in order of reproducing to be reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reproducing a disk medium, and more particularly, to a sound interruption at a discontinuous portion even when music data of a predetermined length or more is not recorded physically continuously. The present invention relates to a disk medium reproducing method capable of outputting sound quickly and quickly after a reproducing operation when music data having a predetermined length or more is continuously recorded.

[0002]

2. Description of the Related Art A mini disc (MD) as a recording / reproducing medium in a mini disc player has a structure shown in FIG. A pit area (TOC area) PTA has a range of 14.5 mm to 16 mm from the center of the disk, and a groove area (recordable area) GRA has a radius of 16 mm to 61 mm of the center of the disk. The groove area (recordable area) GRA includes an inner UTOC area and a program area for recording music data and the like. or,
Address information at predetermined time intervals is recorded on the entire circumference of the recording / reproducing minidisk.

[0003] The TOC area PTA includes a disc type (separate for reproduction only / recording / reproduction), recording power, UTO.
Various data such as a C start address and a head address of a program area are recorded in a pit string in advance. In the program area of the recordable area GRA, the user can record up to 255 songs of arbitrary music data and the like, and the song number, the start address / end address of the song, the track mode (copy protection or not). , Stereo / mono, emphasis on / off, etc.) are collectively managed in the UTOC area as shown in FIG.
Therefore, by referring to the UTOC information, a desired song can be selected and played easily at high speed, and by operating only the recorded contents of the UTOC area, unnecessary songs are erased (ERASE) or all songs are erased (ALL ERASE). ), Song division (DIV
IDE), Combine multiple songs into one song (COMBINE), Move songs
Various editing such as (change track number) (MOVE) can be performed easily.

As shown in FIG. 7, a mini-disc player converts digital music data input from an AD converter 1 into ATRAC (Adaptive Transform Acourstic Coding).
The compressed music data read from the mini disc 3 is demodulated by the ATRAC encoder / decoder 2 and output to the DA converter 4 after being compressed by the encoder / decoder 2 and recorded on the mini disc 3. At the time of reproduction, the optical pickup 5 converts the digital signal (compressed music data) on the mini disc 3 to 1.4M.
Read in bps. On the other hand, ATRAC encoder / decoder 2
If compressed music data is input at 300 Kbps, ATRAC compression is released, music data is input to the DA converter 4 at 1.4 Mbps, and music signals can be output from the DA converter without interruption. In order to absorb the speed difference between 1.4 Mbps and 300 Kbps, a shockproof memory 6 is provided as a data buffer between the optical pickup 5 and the AMTRC encoder / decoder 2.

When the compressed music data read from the mini disk 3 at 1.4 Mbps is stored up to the upper limit FULL, a data full signal is generated. When this data full signal occurs,
Reading from the mini-disc 3 is stopped, and thereafter, the compressed music data is read from the shock proof memory 6 at 300 Kbps and input to the ATRAC encoder / decoder 2. Thereby, when the amount of compressed music data stored in the shock proof memory 6 decreases and becomes equal to the lower limit value EMPTY, a data empty signal is generated. When the data empty signal is generated, the reading of the compressed music data from the mini disc 3 is restarted, and the read compressed music data is set to the upper limit value FULL.
The above control is repeated thereafter. In parallel with the above, the compressed music data read out at a constant rate of 300 Kbps from the shock proof memory 6 is stored in the ATRAC encoder / decoder 2.
The data is demodulated as 1.4 Mbps music data and input to the DA converter 4. The DA converter outputs the music signal without interruption.

At the time of recording music data on the mini-disc 3, the ATRAC encoder / decoder 2 compresses the music data input from the AD converter 1 at 1.4 Mbps according to the ATRAC method, and compresses the compressed music data at 300 Kbps without interruption. Write to 6. The compressed music data is read from the shock proof memory 6 at 1.4 Mbps, and the optical disc 5 reads the compressed music data at 1.4 Mbps.
Write on top. In order to absorb such a speed difference, the operation of reading the compressed music data from the shock proof memory 6 at 1.4 Mbps and writing it to the disk is performed intermittently.

When the compressed music data is read from the shock proof memory 6 at 1.4 Mbps and written to the mini disc 3, the compressed music data in the shock proof memory 6 decreases. Then, when the compressed music data decreases to the lower limit value EMPTY, a data empty signal is generated. When this data empty signal is generated, reading from the shock proof memory 6 and writing to the mini disk are stopped. After that, 300Kbps from ATRAC encoder / decoder 2
The compressed music data is output and stored in the shock proof memory 6. As a result, the amount of compressed music data stored in the shock proof memory 6 increases, and the upper limit value FULL
, A data full signal is generated. When the data full signal is generated, the reading of the compressed music data from the shock proof memory 6 is restarted, the read compressed music data is written to the mini disc 3, and the above control is repeated thereafter.

[0008]

In the case of a mini disc, erasing (ERASE), dividing (DIVIDE), combining (COMBINE), moving (MOVE)
For example, the recorded music data is not necessarily sequential, and is often recorded in discrete steps. In the case of reproducing such a mini-disc, once music data is completely loaded from the mini-disc into the shock proof memory at the start of the reproduction, no sound skipping occurs and there is no particular problem. However, when playing such a mini-disc with a player that starts sound output when it is almost full in the shock proof memory to speed up the sound output, the sound is interrupted at the discontinuous part of the song at the start of playback Occurs.

For example, as shown in FIG. 8A, the music data of the first music piece is divided into two pieces, and the length of the first music piece is one.
Consider the case of playing a mini-disc in a place where the following music part is distant (fourth music or later) in about seconds. First, 1
Add to shock-proof memory of the first bending portion M ₁₁ of the track read one second. At this time, it is assumed that sound is immediately started to be emitted. It takes about 0.2 seconds to read one second of data.
Then gradually raise the sound, to search for the top part to send a peak up to the first track of the continued portion M ₁₂ direction. If this search is completed within 0.8 seconds (= 1.0-0.2) seconds, the sound will not be interrupted. But if, for example, it took 1.2 seconds,
(1.2 + 0.2) -1.0 = 0.4 sound break occurs.

In order to avoid such a sound interruption, for example, a sound output may be started after the reproduction time is set to 10 seconds in the shock proof memory. However, it takes about 2 seconds to store 10 seconds in the shock proof memory, which causes a problem that sound output is delayed. The recording / playback mini-disc has to read the TOC and UTOC information twice, and the sound output is much slower than the CD originally. Occurs. In the above description, the case where the first tune portion of the mini-disc is short has been described. However, as shown in FIG. The same problem as in the case described with reference to FIG.
From the above, it is an object of the present invention to start reproduction from a case where a music piece is divided and a leading music piece portion is short as shown in FIG. 8A, or near the end of the music piece as shown in FIG. Even if the music is in a remote place, there is no sound interruption at the beginning of the music, and in other cases, a method of reproducing a disk medium that can speed up sound output at the start of reproduction. To provide.

[0011]

According to the present invention, the present invention relates to a method for determining whether or not a length in which music data is physically continuously recorded from a reproduction start position is equal to or longer than a set length by referring to UTOC information. Investigation, if the length is less than the set length, write the music data into the shock proof memory for a time that does not cause a sound break, read the music data from the shock proof memory in the order of playback, and play it back. This is achieved by writing music data in the shock proof memory for a time shorter than the above time, and then reading and reproducing the music data from the shock proof memory in the order of reproduction.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (A) Configuration of Mini Disc Player FIG. 1 is an overall configuration diagram of a mini disc player according to an embodiment of the present invention. Reference numeral 11 denotes a recording / reproducing mini-disc, in which UTOC information and compressed music data are recorded in a groove area, and TOC information is recorded in a pit area on the innermost circumference. 12
Reference numeral denotes a spindle motor which rotates the recording / reproducing mini-disc 11 at a predetermined constant linear speed under the control of a spindle servo system. Numeral 13 irradiates the recording / reproduction mini-disc 11 with a laser beam, detects a signal recorded on the recording / reproduction mini-disc 11 from the reflected beam, and raises the temperature above the Curie temperature by the irradiation of the laser beam, which will be described later. An optical pickup that enables magneto-optical recording by a recording head; 14, a feed motor that sends the optical pickup 13 in the radial direction of the recording / reproducing mini-disc 11; 15, a recording head that performs magneto-optical recording of new data during recording; Is a head drive circuit for driving the recording head.

Reference numeral 17 denotes an RF amplifier for generating an RF signal, an EFM signal, various error signals (focus error signal, tracking error signal), an address modulation signal, a CLV control signal, and the like from a detection signal of the optical pickup 13; An address decoder 19 demodulates address data from the output address modulation signal. Reference numeral 19 denotes a servo circuit, which performs focus servo control, tracking servo control, and tracking servo control based on a focus error signal, a tracking error signal, and a CLV control signal output from the RF amplifier. The spindle servo control is performed, and the thread servo control for the feed motor 14 is performed. Reference numeral 20 denotes a digital signal processing circuit. At the time of recording, the digital signal processing circuit 20 converts compressed music data input from a shock proof memory controller described later into an EFM signal, and causes the optical pickup 13 and the recording head 15 to perform magneto-optical recording on the recording / reproducing mini-disk 11. During reproduction, UTOC information and compressed music data are demodulated from the EFM signal input from the RF amplifier and output to the system controller and the shockproof memory controller.

A DRAM 21 stores compressed music data for a predetermined time and also stores TOC / UTOC information. As shown in FIG. 2, a DRAM 21 stores TOC / UTOC storage area 2.
1a and a music data storage area (shock proof memory) 21b. In the TOC / UTOC storage area 21a, the TOC / UTOC information read from the TOC / UTOC area of the disc when the recording / reproducing mini-disc 11 is mounted on the disc player is written. Reference numeral 22 denotes a shock proof memory controller, which performs predetermined communication with the system controller and stores compressed music data input from an ATRAC encoder / decoder (to be described later) during recording in a music data storage area (shock proof memory) 21b of the DRAM 21. The compressed music data is output to the digital signal processing circuit 20 intermittently and at high speed in parallel with the writing. During playback, the shock proof memory controller 22 writes compressed music data input from the digital signal processing circuit 20 intermittently and at high speed into the music data storage area (shock proof memory) 21b at high speed and intermittently. In parallel, compressed music data is continuously output to the ATRAC encoder / decoder at the normal speed.

Reference numeral 23 denotes an ATRAC encoder / decoder.
2ch audio sample data is demodulated from the compressed music data continuously input from the CPU, and at the time of recording, the 2ch audio sample data input from the AD converter is converted into the compressed music data by the ATRAC method, and the shock proof memory controller 22 is used. Output to 24,2
Reference numeral 5 denotes a DA converter for DA-converting audio sample data for 2 ch output from the ATRAC encoder / decoder 23 during reproduction, and 26 and 27 A / D convert an analog audio signal for 2 ch inputted from outside during recording to ATRAC. It is an AD converter that outputs to the encoder / decoder 23.

Reference numeral 28 denotes an operation unit.
It has various operation keys, such as an AY key, a STOP key, and a REC key, for performing normal recording / reproduction operations, and operation keys for operating and editing UTOC information of the recording / reproduction mini-disc 11. Editing includes deleting a song (ERAS
E), delete all songs (ALL ERASE), combine (COMBINE), split (DIVID
E), song number change (MOVE), etc. Reference numeral 29 denotes a display unit that displays UTOC information and the current operation state of the system, and 30 denotes a system controller that controls the entire system.

The system controller 30 controls the entire system in accordance with the operation of various operation keys to perform recording / performance / editing / display control desired by the user, and receives a data full notification from the shock proof memory controller 22 during reproduction. Sometimes pause control, then
Pause release control is performed when a vacancy occurrence notification is received, and when a track jump occurs, a track jump occurrence notification is made to the shock proof memory controller 22 and return control for returning the optical pickup 13 to before jumping is performed. , And notifies the shock proof memory controller 22 of the return notification. Further, the system controller 30 controls the sound output start time according to whether or not the length in which the music data is physically continuously recorded from the reproduction start position is equal to or longer than the set length.

(B) UTOC information FIG. 3 is an explanatory diagram of UTOC information. DISC ID is a disc identification number, P-DFA is a defective area start address,..., P-TN
On (n = 1 to 255) is a pointer indicating the storage location of the strat address of the nth track, Track mode is an indication of copy protection, stereo / mono, emphasis on / off, etc., Link
-P is a pointer indicating the start position of the next music part when the music is divided. If Link-P is 00h, it means the end of the music. Therefore, by referring to the UTOC information, the length of music data that is physically continuous from the reproduction start position can be identified.

(C) Reproduction control FIG. 4 shows a system controller 30 for controlling the sound output start time according to whether or not the length of the music data physically continuously recorded from the reproduction start position is equal to or longer than a set length. 3 is a reproduction processing flow of the first embodiment. When the PLAY key of the operation unit 28 is operated after the mini disk 11 is mounted on the player (step 101), the system controller 30
The UTOC information stored in the TOC / UTOC storage area 21a is inspected, and the length at which music data is physically continuously recorded from the reproduction start position is obtained (step 102). When the PLAY key is operated with the song number specified, the start position (address) of the song number becomes the reproduction start position. When the PLAY key is simply operated without specifying the song number, the PLAY key operation is performed. The pickup position (address) at the time is the reproduction start position.

Next, it is checked whether the obtained length is equal to or longer than a set length (for example, a length corresponding to a reproduction time of 10 seconds).
(Step 103). If the time length is longer than the set time length, music data of a sufficient length is already stored in the shock proof memory 21b at the time of reproduction at the discontinuous portion even if the music is divided, so that skipping occurs at the discontinuous portion. Never. Therefore, if any music data accumulates in the shock proof memory 21b, the music data is continuously read from the memory in the order of reproduction, and the ATRAC encoder / decoder 2
3 to start demodulation, DA conversion, and sound output (step 104). Thereafter, normal play control is performed (step 105).

On the other hand, in step 103, when the length of the music data physically continuously recorded from the reproduction start position is equal to or less than the set length, the music data is stored in the shock proof memory 21b by the time of reproduction of the discontinuous portion. The amount of music data is small and inadequate, and skipping occurs when the discontinuous portion is reproduced. Therefore, in such a case, the sound output is not performed immediately, and the sound output is waited until the music data having a length corresponding to a predetermined time, for example, the reproduction time of 10 seconds is stored in the shock proof memory 21b (step 106, 10
7). Then, if music data having a length corresponding to 10 seconds is stored in the shock proof memory 21b, the music data is continuously read out from the shock proof memory 21b in the order of reproduction, input to the ATRAC encoder / decoder 23, demodulated, and demodulated. Conversion and start sound output (step 104)
Thereafter, normal play control is performed (step 105).

As described above, the continuity of the tune is checked before the reproduction is started, and if the continuity is continued for 10 seconds or more, the sound output is started when any data is accumulated in the memory. if,
If it's not continuous, the song is split, and if it's not continuous for more than 10 seconds, wait 10 seconds for the shockproof memory and then start making sound. In this case, in most cases, a sound can be output quickly in a short time after the operation of the PLAY key, and a rare case (FIGS. 8A and 8B).
Sound can be prevented. As described above, the present invention has been described with reference to the embodiments. However, the present invention can be variously modified in accordance with the gist of the present invention described in the claims, and the present invention does not exclude these.

[0023]

As described above, according to the present invention, it is determined whether or not the length at which music data is physically continuously recorded from the reproduction start position is equal to or longer than the set length by referring to the UTOC information. In the case of, the music data is written into the shock proof memory for a time that does not cause a sound interruption, and then the music data is read out from the shock proof memory in the reproduction order and reproduced. Since the music data is written to the shock proof memory for the time, and the music data is read out from the shock proof memory in the order of reproduction and reproduced, the sound can be output quickly in a short time after the PLAY key is operated. It is possible to prevent the sound from being cut off at the divided part.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a mini-disc player according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a DRAM configuration.

FIG. 3 is an explanatory diagram of UTOC information.

FIG. 4 is a play control processing flow of the present invention.

FIG. 5 is a configuration diagram of a recording / reproducing mini-disc.

FIG. 6 is a schematic explanatory diagram of UTOC information.

FIG. 7 is an explanatory diagram of intermittent write / intermittent read control to a shockproof memory.

FIG. 8 is an explanatory diagram of a conventional problem.

[Explanation of symbols]

11. Mini disc for recording / reproduction 13. Optical pickup 20. Digital signal processing circuit 21. DRAM 21a .. TOC / UTOC storage area 21b .. Music data storage area (shock proof memory) 22 .. Shock proof memory Controller 23 ATCR encoder / decoder 24, 25 DA converter 26, 27 AD converter 30 System controller

Claims (1)

[Claims] An intermittent high-speed reading of music data from a disk having a UTOC area in which a start address and an end address indicating a recording position of a music is recorded and a program area in which music data of the music is recorded is shocked. In a disk medium reproducing method for writing to a proof memory and reading music data continuously from the shock proof memory at a low speed for reproduction, the length of the physically continuous recording of the music data from the reproduction start position is set. If the length is less than the set length, the music data is written into the shock proof memory for a time that does not cause sound interruption, and then the music data is read from the shock proof memory in the order of reproduction. Is read out and played, and if it is longer than the set length, the music data is ® click reproducing method characterized by the writing to the proof memory reading out and reproducing the music data in the reproduction order from the shock-proof memory.