JP2003045170A - Reproducing device, time display method for the same and its program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily understandably indicate that newly specified ATRAC3 system data are being reproduced by an ATRAC decoder not for the ATRAC3 system during silent reproduction. SOLUTION: This system controller 9 judges which of an ATRAC, ATRAC3- LP2 mode, and ATRAC3-LP4 mode is applied to a decoded track from a disk 1. Then, when reproducing data in the ATRAC3-LP2 and LP4 modes by an ATRAC decoder, a reproduction equivalent time is updated at an updating speed which is two times and four times as high as the SP mode at a display part 11. When the updating speed of the reproduction equivalent time is made higher than usual, it is judged that ATRAC3 system data are being decoded by the ATRAC decoder even during silent reproduction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus, a time display method for the reproducing apparatus, and a program.

[0002]

2. Description of the Related Art Conventionally, as a rewritable recording medium, a mini disc (MD; Mini Disc to trademark) has been known. In recent years, ATRAC (Adaptive Transform Acoustic Codi
ng) method is known, and even in the early minidiscs, ATRA
Data is recorded in the C method.

In this encoding method, a sound waveform pattern is divided into frequency bands, and the sound waveform patterns are further divided into a plurality of pieces for data compression. After the ATRAC system, AT
The RAC3 method has also been developed. The ATRAC3 system is a coding system which is based on the ATRAC system and is capable of being compressed to a size of 1/2 or 1/4 of the ATRAC system with almost no loss of sound quality.

[0004]

By the way, ATRAC
Data encoded by the 3 method cannot be decoded by a conventional ATRAC decoder.

[0005] The audio information recorded on the ATRAC3-compatible track of the mini disk is used as it is in the conventional ATR.
Playback with an AC decoder causes noise. In order to prevent this noise, the conventional playback device plays back this audio information silently.

However, due to the format of the mini disk, this silent reproduction ends in half of the time actually recorded by the model compatible with the ATRAC3 system, and when it reaches half of the recorded time. The track ends.

The user does not know why the silent reproduction is performed when the silent reproduction is performed. In addition, when the recording time is known, the user does not know why the track ends when the recording time reaches 1/2 of the recording time.

Therefore, in order to indicate to the user that the data is recorded by the ATRAC3 method different from the conventional ATRAC method, long-time recording is performed when reproducing the data of the track corresponding to the ATRAC3 method of the mini disk. It is recommended to display "LP" indicating that, and there is also a reproducing apparatus that automatically adds such display data.

However, in order to display "LP",
It is necessary to provide a dedicated display segment or a new display "LP" on the liquid crystal display.

If a dedicated display segment is to be provided, the display area is restricted and it is necessary to develop a new display module. In addition, if the liquid crystal display is made to newly display "LP", the display on the liquid crystal display becomes smaller, and if the display is made larger, it becomes necessary to omit the time display and the like. But,
If you switch between the track title and time display, etc., there will be a period when "LP" is not displayed in the title.
It becomes impossible to recognize that the track is not compatible with the ATRAC3 system.

Therefore, in the case of silent reproduction, ATRAC, which is a newly standardized encoding method, is provided without providing a dedicated display segment or newly providing a display.
3 compatible data is converted to conventional ATRAC-based ATRAC
It is necessary to clearly indicate to the user that the decoder is playing.

The present invention has been made in view of the above-mentioned conventional problems, and in the case where there is no sound even when reproduced, the encoded data by the newly standardized encoding method is reproduced. An object of the present invention is to provide a playback device, a time display method for the playback device, and a program that can be displayed in an easy-to-understand manner.

[0013]

In order to achieve this object, a reproducing apparatus according to a first aspect of the present invention is configured so that encoded data and identification information of an encoding method in which the encoded data is encoded are identified. In a reproducing apparatus for reading the encoded data from the recorded recording medium, decoding and reproducing the encoded data, an encoding method reading unit for reading the identification information from the recording medium, and an identification read by the encoding method reading unit. Decoding stop means for stopping the decoding of the coded data when the coding method identified based on the usage information is a predetermined method, and when the decoding stop means stops the decoding of the coded data, Display means for displaying a reproduction equivalent time when the encoded data is decoded and reproduced.

The display means includes a predetermined clock and a counting means for counting the number of clocks of the clock.
The target count number setting means for setting the target count number according to the encoding method, and the reproduction equivalent time when the count number of the clock counted by the counting means reaches the target count number set by the target count number setting means. And a time updating means for updating.

The encoding method is the ATRAC method or A
In the TRAC3 system, when the decoding stopping unit identifies that the encoding system is the ATRAC3 system based on the identification information read by the encoding system reading unit, the ATRAC3 system encoded by the ATRAC3 system is used.
The display means may stop the decoding of the corresponding data, and the display means may display the reproduction equivalent time of the ATRAC3 corresponding data when the decoding stopping means stops the decoding of the ATRAC3 corresponding data.

In the time display method of the reproducing apparatus according to the second aspect of the present invention, the identification is performed from the recording medium in which the encoded data and the identification information of the encoding method in which the encoded data is encoded are recorded. Read information, and stopping the decoding of the encoded data when the encoding method identified based on the read identification information of the encoding method is a predetermined method, and the encoded data When the decoding of (1) is stopped, the step of displaying the reproduction equivalent time when the encoded data is decoded and reproduced is provided.

A program according to the third aspect of the present invention is
A procedure for reading the identification information of the encoding system from a recording medium in which the encoded data and the identification information of the encoding system that encodes the encoded data are recorded in a computer,
A procedure for stopping the decoding of the encoded data when the encoding method identified based on the read identification information is a predetermined method, and when the decoding of the encoded data is stopped, the encoded data is This is for executing the procedure of displaying the reproduction equivalent time when the data is decrypted and reproduced.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the structure of a reproducing apparatus 100 according to an embodiment of the present invention. As shown in FIG. 1, the reproducing apparatus 100 has a spindle motor 2
An optical pickup 3, a feed motor 4, a recording head 5, a head driver 6, and an RF (Radio Frequency).
It is composed of an amplifier 7, a digital signal processing circuit 8, a system controller 9, an operation unit 10, and a display unit 11.

The disc 1 is a rewritable record data such as a mini disc. Music data or the like is recorded on the disc 1 in a data format compatible with ATRAC or ATRAC3.

The ATRAC recorded on the disc 1,
A data format of the ATRAC3 system is shown in FIG. This format is the format of the data stream when stored in the sound group of the disc 1, which is an MD.

In the ATRAC system shown in FIG. 2A, L
512 sample PCM per channel and R channel
(Pulse Code Modulation) Signals are collectively encoded,
This is stored in one sound group of MD.

On the other hand, the ATRAC3 system is shown in FIG.
As shown in, ATRAC3-LP2 mode and ATRA
There is a C3-LP4 mode. The ATRAC3-LP2 mode is a coding method in which 1024-sample PCM signals are collectively coded and separately recorded in the L channel and the R channel.

In the ATRAC3-LP4 mode, the correlation component between the L channel signal and the R channel signal is detected, the correlation component is recorded as the main channel (M), and the other components are recorded as the sub channel (S). This is the encoding method. As described above, in the ATRAC3-LP4 mode, the coding rate is increased by commonly using the correlation component recorded in the main channel for the L channel signal and the R channel signal.

When compared with the data of the ATRAC system,
The data compression rate is doubled for the ATRAC3-LP2 track and four times for the ATRAC3-LP4 track.

ATRAC3-LP2 mode, ATRAC
A dummy bit of 12 bytes is added to the 3-LP4 mode data. The dummy bit is a scale factor for identifying the conventional ATRAC decoder to silently reproduce the reproduction track.

Returning to FIG. 1, the spindle motor 2 is controlled by the digital signal processing circuit 8 to rotationally drive the disk 1 held by the turntable or the clamp mechanism at a predetermined rotational speed.

The optical pickup 3 is for irradiating the disc 1 with a laser beam to enable recording / reproducing of recorded data such as music data. More specifically, the optical pickup 3 outputs a high-level laser beam that heats a recording track of the disc 1 to the Curie temperature when recording data on the disc 1. In addition, the optical pickup 3
When the recorded data is reproduced from the disc 1, a low-level laser beam that enables the detection of the data signal by the reflected light received by using the magnetic Kerr effect is output. Optical pickup 3
Sends the detected data signal to the RF amplifier 7.

The feed motor 4 is for moving the optical pickup 3 in the radial direction of the disc 1 under the control of the digital signal processing circuit 8.

The recording head 5 is for writing data, is arranged at a position facing the optical pickup 3 with the disk 1 sandwiched therebetween, and generates a magnetic field according to the drive signal received from the head driver 6, 1 is applied.

The head driver 6 receives data encoded by the digital signal processing circuit 8,
This is for generating a drive signal for driving the recording head 5, and supplies the generated drive signal to the recording head 5.

The RF amplifier 7 executes arithmetic processing based on the signal detected by the optical pickup 3,
Group information such as a reproduction RF signal that is a data signal, a tracking error (TE) signal, a focus error (FE) signal, and absolute position (ADIP; ADdress In Pregroove) information recorded as pregrooves on the disc 1 are extracted. . The RF amplifier 7 sends the extracted various signals and information to the digital signal processing circuit 8.

The digital signal processing circuit 8 is a circuit for executing signal processing such as encoding / decoding of user data to be recorded / reproduced on the recording / reproducing disc 1 and decoding of address information, as shown in FIG. , ADIP
Decoder 21 and EFM (Eight-to-Fourteen Modulati
on) decoder 22 and DRAM (Dynamic Random Acces)
s Memory) 23, memory controller 24, ATR
An AC encoder 25, an ATRAC decoder 26, and a buffer memory 27 are provided.

The ADIP decoder 21 decodes address information such as absolute position information (ADIP information) received from the RF amplifier 7. EFM decoder 22
Is an ATRAC (Adaptive TRansfer Acoustic Coding) included in a reproduction RF signal that has been subjected to EFM system modulation.
The data, address, sub-data, etc. are decoded.

The DRAM 23 is a memory for temporarily storing data in order to realize, for example, a shock proof function, and the memory controller 24 is a DRAM.
It controls the writing / reading of data to / from 23.

The ATRAC encoder 25 is an ADC (An
The ATRAC data is generated by encoding music data and the like input from an alog-to-digital converter or the like.

The ATRAC decoder 26 expands the ATRAC data decoded by the EFM decoder 22 and outputs it to a DAC (Digital-to-Analog Converter) or the like.

The buffer memory 27 is composed of a semiconductor memory or the like, and when the ATRAC encoder 25 compresses the data from the ADC to generate ATRAC data, A
It is a memory for temporarily storing data when the TRAC decoder 26 expands ATRAC data.

The ATRAC decoder 26 is a decoder for decoding and decoding ATRAC data.
The ATRAC decoder 26 is a conventional decoder that does not support the ATRAC3 system.
Data in the 3-LP2 mode and ATRAC3-LP4 mode cannot be decoded.

The system controller 9 is composed of a microprocessor or the like, and controls the operation of the digital signal processing circuit 8 to record / reproduce data on / from the disk 1.

Further, the system controller 9 has a clock, uses this clock to update the time display of the reproduction equivalent time, and displays the time display and information such as the track number on the display unit 11.

The operation unit 10 is composed of a push switch, a keypad, etc., and is for inputting instruction information for instructing the start / stop of recording / reproducing of user data to the system controller 9 by the operation of the user. .

The display unit 11 is an LCD (Liquid Crystal D
isplay) panel, etc., and displays the reproduction time, track number, recording mode such as SP mode, ATRAC-LP2, ATRAC-LP4 mode, level, etc. under the control of the system controller 9.

Next, the structure of the disk 1 will be further described. The disc 1 is a recording medium in which user data can be recorded / reproduced with, for example, 36 sectors as one recording / reproducing operation unit (cluster), and a user data recording area (user area) for recording user data such as music data.
And a management information area for recording management information for managing the configuration of the user data recording area.

In the management information area, for example, U-TOC (User's Table Of Cont) is provided as rewritable management information.
ents) are recorded. FIG. 4 shows the U-TO of sector 0.
It is a figure which illustrates the structure of C. As shown in the figure, the U-TOC of sector 0 is composed of 588 × 4 bytes of data, and includes information for managing user data such as music data recorded in the user area. Note that FIG.
The numerical value shown with "h" in is a numerical value in so-called hexadecimal notation.

The P-DFA is a table pointer for designating a defective area (DFA; DeFective Area) on the disk 1, and designates the leading byte position of the part table showing the sector which becomes the defective area due to scratches or the like. .

P-EMPTY is a table pointer that designates the leading byte position of an unused part table.

The P-FRA is an unrecorded area (FRA; Free Recordable Ar) in which data can be recorded on the disc 1.
ea), which specifies the first byte position of the part table that indicates the sector to be the unrecorded area.

P-TNON (n; 0 to 255) is a table pointer for designating the recording position of the music data recorded on the disc 1. For example, P-TNO1 is the first music (track number is "1"). ), The head byte position of the part table indicating the sector in which the music data corresponding to the music is recorded is designated.

Start address, End a
ddress is a pointer that specifies the start address and end address of the user data, respectively. This St
Start with art address, then End address
User data ending with ss is one track. Tra
ck mode is information for identifying the encoding method in the track, and the recording track of the user data is AT
RAC, ATRAC3-LP2, ATRAC3-LP4
It indicates which of the encoding methods is used for the track.

Link-P is a link pointer that indicates the connection relationship of music data and the like recorded in a plurality of physically discontinuous segments in the user area. For example, P-
Link-of the part table specified by TNO1
By P, the byte position of the other part table is designated according to the temporal reproduction order (recording order), and thereafter,
Link-P in the linked part table is "00"
Each part table is concatenated until it becomes "h". By reading and reproducing the data from the recording position (sector) shown in each part table according to the concatenated order, the user areas are physically separated. The recorded music data or the like can be continuously reproduced as one music.

Next, the reproducing apparatus 100 according to the present embodiment.
The operation of will be described. When the disc 1 is mounted on a turntable or the like, the spindle motor 2 rotates the disc 1. When the disk 1 rotates, the system controller 9 instructs the digital signal processing circuit 8 to read the U-TOC read from the management information area of the disk 1.
To get. Then, the system controller 9 specifies the configuration of the recording data in the user area based on the acquired U-TOC.

When the structure of the recording data in the user area is specified, the ADIP decoder 21 of the digital signal processing circuit 8 decodes the ADIP address information, and the EFM decoder 22 decodes the EFM address information. This allows the user data to be reproduced.

The feed motor 4 moves the optical pickup 3 to the read position of the recorded data, and the optical pickup 3 moves
The disk 1 is irradiated with laser light to detect return light, which is converted into an electric signal and sent to the RF amplifier 7.

The RF amplifier 7 executes arithmetic processing and the like based on the signal received from the optical pickup 3 and extracts a reproduction RF signal, a tracking error signal, a focus error signal and the like which are data signals. The RF amplifier 7 sends the extracted various signals to the digital signal processing circuit 8.

The EFM decoder 22 decodes the reproduced RF signal that has been subjected to the EFM system modulation. The decoded data is supplied to the memory controller 24, and the memory controller 24 uses the DRAM 23 to realize the shock proof function and the like. The memory controller 24 also supplies data to the ATRAC decoder 26,
The ATRAC decoder 26 decodes the data supplied from the memory controller 24.

The ATRAC decoder 26 uses ATRAC data, ATRAC3-LP2 mode, ATRAC
Although it is possible to decode data in 3-LP4 mode, ATRAC3-LP2 mode, ATRAC
It is not possible to decrypt data in 3-LP4 mode. Only ATRAC data can be decrypted. Data is ATRAC3-LP2 mode, ATRA
In the C3-LP4 mode, the ATRAC decoder 26
Plays this data silently.

The system controller 9 predetermines the update speed of the playback equivalent time depending on whether the track to be decoded is the ATRAC track or the ATRAC3 track.

The update speed of the reproduction equivalent time is determined by the data compression rate. In the case of ATRAC data, that is, when the compression rate in SP mode is 1, A
The compression rates in the TRAC3-LP2 mode and the TRAC3-LP4 mode are 2 times and 4 times, respectively. Therefore, ATRAC3-LP2 mode, TRAC3-LP
When each of the 4 mode data is reproduced while being decoded by the ATRAC3 decoder, the decoding speed is
It becomes 1/2 or 1/4 that in the case where the ATRAC data is reproduced while being decoded by the ATRAC decoder 26.

Then, the ATRAC3 system data is sent to the AT.
When decoding with the RAC3 decoder, the decoding speed is X, and the data of the ATRAC3 system is ATRAC decoder 2
The system controller 9 obtains X / Y, where Y is the decoding speed when decoding is performed in 6. This X / Y
Is the update speed of the reproduction equivalent time displayed on the display unit 11.

The track to be decoded is ATRAC3-L
In the case of the P2 mode track, X / Y is 2. X / Y
If is 2, the update speed is doubled in SP mode. When the track to be decoded is the ATRAC3-LP4 mode track, X / Y is 4. If X / Y becomes 4, the update speed is made 4 times faster than in SP mode.

The system controller 9 determines the target count number of the clock based on the update speed. Then, the system controller 9 counts the clock, and when the count number reaches the target count number, the reproduction equivalent time is updated and the count number is cleared.

Next, the system controller 9 causes the display unit 1 to
FIG. 5 shows the operation of displaying the reproduction equivalent time in 1. First, the system controller 9 determines whether or not there is a key input for instructing the operation unit 10 to start reproduction (step S11). If there is no key input to the operation unit 10 to start the reproduction, the system controller 9 ends the process.

When there is a key input on the operation unit 10 to start reproduction, the system controller 9 causes the track
The track that identifies and decodes the mode is ATRA
It is determined whether it is the C track or the ATRAC3 track (step S12).

When the system controller 9 determines that the track to be decoded is the ATRAC track, it sets the target count number to the SP mode value (step S1).
3). When the target count number is set to the SP mode value, the system controller 9 updates the reproduction time at the SP mode update speed.

Next, the track to be decoded is ATRAC.
When it is determined that the track is not the track, the system controller 9 determines whether the track to be decoded is the ATRAC3-LP2 mode track (step S1).
4).

The track to be decoded is ATRAC3-L
When it is determined that the track is the P2 mode track, the system controller 9 sets the target count number to 1 / the value of the SP mode value.
2 (step S15). 1/2 target count
Then, the update speed of the reproduction equivalent time becomes twice as fast as that of the SP mode, and the system controller 9 updates the reproduction equivalent time at this update speed.

When the system controller 9 determines that the track to be decoded is not the ATRAC3-LP2 mode track, the track to be decoded is ATRAC3-.
It is determined whether the track is an LP4 mode track (step S16).

The track to be decoded is ATRAC3-L
When it is determined that the track is not the P4 mode track, the system controller 9 ends this process.

The track to be decoded is ATRAC.
When it is determined that the track is the 3-LP4 mode track, the system controller 9 sets the target count number to 1/4 of the SP mode value (step S17). When the target count number is set to ¼, the update speed of the reproduction equivalent time becomes four times that of the SP mode, and the system controller 9 updates the reproduction equivalent time at this update speed.

As described above, according to the present embodiment, the data of the newly standardized ATRAC3 system is
When the TRAC decoder 26 decodes, the update speed of the playback equivalent time is set to be faster than that in the SP mode, so that it is easy for the user to understand that the ATRAC3 format data is being played even if the silent playback is performed. be able to. Further, since the reproduction equivalent time of the track and the time display coincide with each other, it is possible to grasp the actual position of the track on the time axis.

In addition, a dedicated display segment such as "LP" is provided so that the user can recognize that the decoded track is an unsupported ATRAC3 track.
There is no need to provide a new display on the liquid crystal display.

The disc 1 is not limited to the mini disc. Also, the encoding method is not always AT
The present invention is not limited to the RAC method and ATRAC3 method. In addition, a program for operating a computer as all or a part of a reproducing apparatus or executing the above-described processing is provided on a flexible disk or a CD-ROM.
(Compact Disc Read-Only Memory), DVD (Digital
It may be stored in a computer-readable recording medium such as a Video Disc), distributed, installed in a computer, operated as the above-described means, or executed the above-described steps.

[0074]

As described above, according to the present invention,
When trying to reproduce the encoded data encoded by the newly standardized encoding method by the conventional encoding method,
That fact can be clearly shown.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a playback device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a data format of an ATRAC system.

3 is a block diagram showing a configuration of a digital signal processing circuit of FIG.

FIG. 4 is a diagram illustrating a configuration of a U-TOC of sector 0.

FIG. 5 is a flowchart showing the operation of the system controller.

[Explanation of symbols]

1 disc 2 spindle motor 3 optical pickup 4 Feed motor 5 recording head 6 head driver 7 RF amplifier 8 Digital signal processing circuit 9 System controller 10 Operation part 11 Display 100 playback device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI theme code (reference) G11B 20/10 321 G11B 27/34 S 27/34 H03M 7/14 B H03M 7/14 G10L 9/18 A M

Claims (5)

[Claims] 1. A reproducing apparatus for reading, decoding and reproducing the encoded data from a recording medium on which encoded data and identification information of an encoding method in which the encoded data is encoded are recorded. Coding method reading means for reading the identification information from a recording medium, and decoding of the encoded data when the coding method identified based on the identification information read by the coding method reading means is a predetermined method A decoding stop means for stopping the encoding, and a display means for displaying a reproduction equivalent time when the encoded data is decoded and reproduced when the decoding stop means stops the decoding of the encoded data. A playback device characterized by the following. 2. The display means includes a predetermined clock, a counting means for counting the number of clocks of the clock, a target count number setting means for setting a target count number according to the encoding method, and the count. 2. The time updating means for updating the reproduction equivalent time when the count number obtained by counting the clocks by the means reaches the target count number set by the target count number setting means. Playback device. 3. The encoding system is the ATRAC system or A
In the TRAC3 system, the decoding stopping means is based on the identification information read by the coding method reading means, and the coding method is ATR.
When it is identified as the AC3 system, the decoding of the ATRAC3 compliant data encoded by the ATRAC3 system is stopped, and the display means, when the decoding stopping means stops the decoding of the ATRAC3 compliant data, the ATRAC3 compliant data is displayed. 3. The playback device according to claim 1, wherein the playback equivalent time is displayed. 4. A step of reading the identification information from a recording medium on which encoded data and identification information of an encoding method obtained by encoding the encoded data are recorded, and identification of the read encoding method. Stopping the decoding of the encoded data when the encoding method identified based on the usage information is a predetermined method, and when the decoding of the encoded data is stopped, the encoded data is decoded. And a step of displaying a reproduction equivalent time when the reproduction is performed, the time display method of the reproduction device. 5. A procedure of reading the identification information of the encoding method from a recording medium in which encoded data and identification information of the encoding method obtained by encoding the encoded data are recorded in a computer, A procedure for stopping the decoding of the encoded data when the encoding method identified based on the identification information is a predetermined method, and when the decoding of the encoded data is stopped, the encoded data is decoded. The program of the playback device for executing the procedure for displaying the playback equivalent time when the playback is performed.