JP2001273749A - Optical disk reproducing and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems, such as an increase of a buffer memory quantity, a significant time lag from the segments reproduced from the memory when the segments currently readed from a CD are displayed and the complication of processing flow if P-TIME is directly used in dealing with the optical disk reproducing device of CDs, etc., of a system to previously read data and to record the data into the buffer memory in order to prevent the sound skip, etc., by the impact against a player and to reproduce and output the data. SOLUTION: The audio data 8 read out of the CD 1 is recorded in the memory 12 for audio buffer and aural signal output 13 is obtained by reproduction therefrom. On the other hand, the sub-code data 7 is recorded in a data table memory 16 for display indicating the correspondence of the second unit of P-TIME and A-TIME and the time accumulated in the buffer memory 12 is subtracted. The P-TIME corresponding to the A-TIME is determined from the memory 16 and is displayed on a display unit 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reproducing data from an optical disk such as a CD, which is provided with reproducing means for pre-reading data, storing the data in a buffer memory, and outputting the data from the buffer memory. The present invention relates to an optical disk reproduction and display device for displaying a part that is playing.

[0002]

2. Description of the Related Art For various types of optical disks such as CDs, there are a fixed type optical disk reproducing device used at home, a compact portable player, and an on-vehicle optical disk reproducing device mounted on a vehicle. Widely used. In these optical disc reproducing devices, it is possible to determine which song is currently being reproduced and which portion of the song is being reproduced in various forms with respect to a display unit such as a liquid crystal display device provided in the player. The display has been done. At this time, the part actually displayed is the track number of the part currently being read from the disk and the elapsed time from the beginning of the track.

On the other hand, a widely used audio C
As described above, portable and in-vehicle types of optical disc reproducing apparatuses such as a D player, an MD player, a DVD player, and the like are also increasing. Since many vibrations and shocks such as the vibration of the servo are received, the data read is interrupted due to the deviation of the servo.

As a countermeasure, a buffer memory is connected to the control device of the player, and audio data and video data to be output from the outside are recorded and stored in the buffer memory in advance when the player reproduces the data. A device that reads and outputs data from the buffer memory is also used. In other words, in such a player, data on an optical disk such as a CD is pre-read and stored in a buffer memory, and the data is reproduced and output in order from the buffer memory. Even if such a situation occurs, during the time when the stored data in the buffer memory is being read and played back, the pickup is returned to the original disk reading position, data reading is resumed, high-speed reading is performed, and the original data is read again. First, data is stored in a buffer memory.

In a player using such a buffer memory, the capacity of the buffer memory has recently been increased,
It is possible to sufficiently cope with large vibrations and continuous vibrations for a long time. In addition, with the recent improvement in the data processing speed of players, not only listening while reproducing, but also providing a large buffer memory in advance, and the player reads data for a predetermined time at high speed and accumulates the data in the buffer memory. An intermittent high-speed reading operation from a disk is also performed, in which data is reproduced and output, and when the amount of data that has been reproduced and accumulated for a predetermined time or more decreases, high-speed reading is performed again by the player.

[0006] In the above-described optical disk reproducing apparatus for pre-reading, for example, a reproducing operation is performed by an apparatus as shown in FIG. 3 and a reproduced portion is displayed. That is, the illustrated example shows a player of an audio CD, and an optical disc 3 such as a CD stored in a large number in a disc changer 30.
1 is selected and applied to the player 32, is driven to rotate by the spindle motor 33, and the pickup 34 reads data recorded on the disc. The read RF signal and signals such as a focus error signal and a tracking error signal are transmitted to the RF amplifier 3
5, the signal enters the signal processing unit 36 and is processed. The sub-code data 37 as management information and the audio data 38 as audio information are separated from these signals, and the sub-code data 37 is input to the system controller 40 to be various control data. The audio data 38 is supplied to the buffer RA through the memory controller 41 instructed by the system controller 40 to operate.
The amount of the predetermined time is recorded in M42.

The audio data recorded in the buffer RAM 42 as described above is sequentially read out to the signal processing unit 36 via the memory controller 41 in accordance with an instruction from the system controller 40, and an audio signal output 43 is performed. In the signal processor 36, the servo driver 44 controls the drive of the spindle motor 33 and the pickup 34, and also responds to the focus error and tracking error as described above.

With such a device, data on an optical disk 31 such as a CD, which is arbitrarily selected, can be read out, and audio can be sequentially output from the audio data stored in the RAM 42 for a buffer. Even when the data reading is interrupted due to the above, the reading of the audio data from the buffer RAM can be continued while the pickup is returned to the original reproduction state.
I try not to feel any change in the audio being played.

On the other hand, a display unit 45 is connected to the system controller 40. As shown in the figure, the display unit 45 displays the number of the currently output tune on the disc being reproduced. That is, a track number display 46 in the CD data and an elapsed time display 47 indicating the elapsed time from the beginning of the track in minutes and seconds are performed. Also, the currently playing index number is displayed as needed. As a result, the user can be informed of the song currently being reproduced, and, for example, setting of a cue portion at the time of repetitive reproduction, setting of a skip position, and the like can be easily performed based on this data. I can do it.

The display of the reproduction position as described above is performed by, for example, C
In the case of the disk D, this can be performed by reading recorded data as shown in FIG.
That is, as shown in (a), the management information of this disc is recorded on the lead-in portion of the data reading start portion on the surface of the CD disc, and divided into tracks as movements up to the last lead-out portion. ing. Each track has
Normally, data for one song is recorded.

As shown in FIG. 1B, the inside of this track is subdivided into indices and can be divided into up to 99 indices. However, in a normal music CD, many subdivisions are not performed. This index is used to provide a blank so that music pieces between them are not continuous. For example, an index 0 is often used for a blank part and an index 1 is often used for a music data part.

In order to facilitate data management, each index is subdivided into 1/75 second frames as shown in FIG. 3C, and each frame is divided into sub-codes as shown in FIG. It is divided into a sub-channel on which data is recorded and a main channel on which audio data is recorded. When the index is not subdivided as described above, this frame is substantially data obtained by subdividing the track. The sub-channel includes a synchronization unit and eight sub-channels P to X, as shown in FIG. However, general music CDs often do not use the R to X channels.

In the above sub-channels, in particular, a sub-code Q (SUB-Q) includes a synchronization part (CTL), an address part (AD), its track number (TNO), and an index number as shown in FIG. (INDEX),
Elapsed time from the beginning of this movement (track) (P-TI
(ME), the minute (MIN), the second (SEC), the number of this frame (P-FRAME), the 0 data part (ZERO) for indicating between data, and the continuation from the first movement (track) of this CD. Minutes (MIN) as absolute time (A-TIME) from the elapsed time music audio data
Seconds (SEC), number from the first frame of this CD (A-FRAME), CRC as error correction data
Etc. are provided.

In the data structure of the CD as described above,
At the time of displaying the currently reproduced music and the reproduction position, the display section of the conventional player displays the above-mentioned various data, especially the track number, index number, and P-TIME movement in the subcode Q channel (SUB-Q). The easiest method is to read the elapsed time data in the data and display the data as it is.

P-TIM which is relative time data in a movement
The data of E is, for example, as shown in the table of FIG. In this table, the data structure is shown as data for each elapsed time of 1 second for easy understanding of the data configuration. As shown in this table, TRACK No., which is a track switching portion in particular, is used. In the 7th and 8th columns in the figure where P changes, P-TIME is expressed as 2 minutes 33 seconds to 00 minutes 2 seconds. That is, when the previous track 02 is completed and the next track 03 is entered, the index changes from 01 to 00, indicating that the pause period is a pause period as a silence period. It indicates whether to end after a second and start the next song. In the pause section, the display device assigns a minus sign (-) to this number, and the number gradually decreases, so that it is possible to tell how many seconds later the next song starts.

Also, the portion where the index number changes from 00 to 01 indicates the position to enter the next song.
The IME changes from 01 to 00, and thereafter the numbers increase to 01 and 02, so that it is possible to display how many minutes and seconds have elapsed since the reproduction of the music of the next track number 03 started. . Note that this table shows an example in which only one index of 00 and 01 is used for one track, that is, an index is used only to indicate a pause section, but a long track is divided and managed. Further subdivision is also performed.

[0017]

In the case of displaying the elapsed time or the like on a display device by using the P-TIME in the CD data, while reproducing the data of the CD,
When the sound is directly output from the speaker as it is, the above-described P-TIME can be displayed as it is from the read data. However, in a player using a buffer RAM 42 as shown in FIG. 3, audio data is pre-read and stored in the buffer RAM 42, and the audio data stored in the buffer RAM 42 is reproduced sequentially from the audio data. The data position at which data is read out from the CD disk by the pickup is different from the data position at which sound is output. Such a temporal difference may be allowed in a short time, for example, about 1 to 2 seconds.

However, in recent years, in order to make the player more impact-resistant and to enable high-speed reading, the memory has become cheaper,
There is an increasing tendency to increase the capacity of buffer memories.
As described above, when the capacity of the memory is increased, if the position where data is currently read out by the pickup is displayed as it is, there is a large difference in time from the position where audio is output. Despite the output, the display device is playing the next song, which is unacceptable to the user.

For this reason, it is conceivable to display the data from the position where the data is currently being output by the pickup by subtracting the amount of time during which the data is stored in the memory. And can be displayed by processing. That is, the track number (TRACK No.), index (INDEX), P-TIME, and A-
SUB-Q data such as TIME is read, and the current Q
Is the value of the SUB-Q (step S11).

Next, the track number (TRACK N)
o. ) Is changed (step S12),
When it changes, the P-TIME immediately before the change is stored (step S13). If the track number does not change in step S12, the process proceeds to step S14. In step S14, it is determined whether or not INDEX has changed, and the P-TIME before the change is stored in memory (step S15). Normal audio CD
Is divided into tracks, and is displayed by P-TIME as in the above example. However, in the case of a series of songs from the beginning of the CD, such as when one song is a long time, , Can be displayed by A-TIME if necessary.

As described above, the value of Q and the amount of data stored in the buffer memory converted to the reproduction time (Qst
rd) Based on the data, the display data (Qdisp) is changed to [Qd
isp = Q−Qstrd]. However, the TRACK No. If INDEX has changed, it is necessary to calculate from P-TIME before the change. That is, as shown in the table of FIG. 02 to No. 2 As can be seen from the seventh and eighth columns, which change to 03, P-TIME changes from 2:33 to 0: 2, and then becomes a value subtracted by 1 second, and the index becomes 00. From the part changing to 01, the value is accumulated every second. As described above, the P-TIME data at the portion where the track number changes is complicated,
In order to properly display this, complicated calculations must be performed in accordance with the position from which data is read and the position where data is actually reproduced. For this reason, there is a problem that software for calculating this becomes complicated.

Therefore, according to the present invention, in an optical disc reproducing apparatus in which pre-read data is stored in a buffer memory in advance and audio data in the data is sequentially reproduced and output to the outside, only a simple process is performed. It is an object of the present invention to provide an optical disk reproduction and display device capable of accurately displaying a portion reproduced and output from a buffer memory.

[0023]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a data reading unit for reading data from an optical disk, a buffer memory for recording the read data, and a data memory for storing the data recorded in the buffer memory. An optical disc reproducing / displaying device comprising a signal output means for reading and outputting to the outside and a display device for displaying a recording position of output data, wherein at least a track number and an absolute value representing a series of elapsed time from the beginning of the disc are provided. A display memory in which time data and relative time data representing the elapsed time in the track are recorded for an amount of time corresponding to the capacity of the buffer memory, and the absolute time read from the optical disk is used to store the data in the buffer memory. The display corresponding absolute time is obtained by subtracting the time of the recorded data, and the display corresponding absolute time is obtained from the display memory. It reads the corresponding relative time data is obtained by the optical disk reproducing display device characterized by comprising a display means for displaying this on the display device together with the track number.

In still another aspect, the apparatus further comprises a memory table check unit for checking whether display data read from the optical disk exists in the display memory.

In another aspect, an index is recorded in the display memory, and the index is also displayed on the display device.

[0026]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram of an embodiment of the present invention. Portions having the same functions as those of the conventional one shown in FIG. 3 are indicated by the same blocks. Hereinafter, an explanation will be given based on an example in which the most commonly used audio CD is used as the optical disc reproduced in the present invention. A CD 1 selected from a disc changer 9 shown as a block in FIG. 1 is applied to a player 2, is driven to rotate by a spindle motor 3, and data recorded on the disc is read by a pickup 4.

The read RF signal, and signals such as a focus error signal and a tracking error signal are amplified by an RF amplifier 5 and processed by a signal processing unit 6. The subcode data 7 such as the SUB-Q data and the audio data 8 are separated from those signals, and the subcode data 7 is input to the system controller 10 and used as various control data. The audio data 8 is recorded in the audio buffer memory 12 via the audio memory controller 11 for a predetermined amount of time such as 5 seconds.

The system controller 10 instructs, via the audio memory controller 11, to sequentially read the audio data recorded in the audio buffer memory 12 as described above. The read audio data is processed by the signal processing unit 6 to output an audio signal output 13.
I do. These parts correspond to the signal output means of the present invention. In the signal processing unit 6, the servo driver 14 controls the drive of the spindle motor 3 and the pickup 4. The above components are the same as the conventional one,
With such a device, data of the CD 1 arbitrarily selected is read, and audio can be sequentially output from the audio data recorded in the audio buffer memory 12. When errors or tracking errors occur,
By reading the audio data from the buffer memory while returning the pickup to the original playback position and the original playback state, the user does not feel any change in the audio to be played despite the various errors. I have to.

On the other hand, a display data table memory 16 is connected to the system controller 10 via a display data memory controller 15, in which a part of the data as shown in FIG. 5 is recorded. ing. Here, at least the audio buffer memory 12
The display data for the time stored in the memory is stored.
Therefore, if the audio buffer memory can store, for example, data for 5 seconds, the display data table memory 16 stores data for each second in this table for 5 seconds, that is, FIG. It is set to record data for the middle five columns. However, in consideration of the deviation from the data stored in the audio buffer memory, it is also possible to record more data for about 1 to 2 seconds.

Items recorded in this table include a track number (TRACK No.), an index (INDEX), P-TIME minutes and seconds, and A-
TIME minutes and seconds are recorded. This data is updated by deleting old data every time new data is read from the disk and input from the display data memory controller 15. The timing of this update substantially coincides with new audio data recorded in the audio buffer memory.

The system controller 10 controls the display data table memory 1 via the memory table confirmation unit 17.
6, it is possible to confirm what data is recorded, and data that already exists in the memory table is not recorded. In particular, data is recorded every 1 second in the display data table memory 16, whereas data read from the CD is every 1/75 second. Therefore, it is necessary to record all read data. It is preferable to check the data in the memory table as described above, since the data for display is not wasteful because it is not a scale that requires a large amount of memory.

Also, the system controller 10 calculates an A-TIME corresponding to a time obtained by subtracting the A-TIME of the data currently read from the CD by the amount of data recorded in the audio buffer memory, Thus, the A-TIME of the data read from the audio buffer memory 12 and reproduced is calculated, and the A-TIME is transmitted to the display data memory controller 15.
Instructs reading of data corresponding to the IME. On the basis of the data read in this way, the display unit 20 displays the track number, the time when a minus is displayed until the actual song is reproduced when the track is changed to this track,
And the time since the song was actually reproduced, and an index or the like as necessary.

In the apparatus having the above block configuration,
In particular, the operation of creating the display data can be performed according to the flow shown in FIG. That is, when the display data is created, the track number (TRAC) is obtained from the CD data.
K No. ), Index (INDEX), P-TI
SUB-Q data such as ME and A-TIME is read, and the current Q value is set as the read SUB-Q value (step S1). Note that P-TIME is relative elapsed time data in a track (movement) as described above.
TIME is absolute time data representing a series of elapsed time continuous from the beginning of the CD, and P-TIME is usually displayed on a display device.

Next, the memory table confirming section 17 shown in FIG. 1 stores the Q captured as described above in the display data table memory 1 as backup data.
6 is determined (step S)
2). That is, in the above step 1, 1/1 shown in FIG.
Read the data of the frame output every 75 seconds,
Since the display data is data every one second, a large amount of data already exists, and only when the A-TIME data changes, the display data memory controller is instructed to record the data. (Step S
3). At this time, the display data table memory 16
The oldest data in is erased. Thus, A-
The data is constantly updated every second of TIME and recorded in the display data table memory 16.

On the other hand, as the display data, after the signal from the pickup 4 is processed by the signal processing unit 6 as described above, the AT data is obtained from the data obtained as the subcode data.
The data of IME is taken in, and this is Q (A-TIME)
The amount of data currently recorded in the audio buffer memory 12 is stored in the audio memory controller 11.
, And this is set as Qstrd, and A-TIME as the display corresponding absolute time corresponding to the data to be displayed is [Q
(A-TIME) -Qstrd].
Data corresponding to TIME is read from the display data table memory 16 and is used as display data (Qdisp) (step S4). This data is stored in the display unit 20
And displays the track number, the elapsed time in the track, and the index and the like as necessary.

In the present invention, as described above, it is not necessary to perform complicated processing as in the conventional optical disk reproduction and display apparatus, and accurate reproduction position data can be displayed by a simple processing flow.

In the above-described embodiment, the operation of reproducing an audio CD, which is the most common mode of use, is shown as an example of reproducing an optical disk. In a CD player, it is possible to accurately display a portion currently being reproduced and output only by performing a simple process. In addition, audio and video recording such as a video CD, MD, laser disk, DVD, etc. Even in the reproduction of various optical disks as a medium, the present invention can be applied in the same manner without adding any special means, whereby the same effects as in the above embodiment can be obtained.

[0038]

The present invention is configured as described above.
Pre-read data is stored in the buffer memory in advance,
In an optical disc reproducing apparatus that reproduces and outputs the audio data in order, it is possible to accurately display the portion currently reproduced and output only by performing a simple process.

Further, in the case where the display data read from the optical disk is provided with a memory table check section for checking whether or not the display data exists in the display memory, the data already existing in the display memory is stored. Therefore, it is possible to record data for a long time with a small amount of memory.

In the display memory, the index is recorded, and the index is displayed together with the track number on the display device. In addition, the reproduction position of the index obtained by dividing the track can be known. When the index is a predetermined value such as 0, various displays such as indicating a waiting time until the reproduction of the music recorded on the track can be performed clearly.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of an embodiment of an optical disk reproduction / display apparatus according to the present invention.

FIG. 2 is an operation flowchart of the same.

FIG. 3 is a functional block diagram of a conventional optical disk reproduction and display device.

FIG. 4 is a data configuration diagram showing a data configuration of a CD.

FIG. 5 is a data table showing an example in which data obtained from a subchannel-Q code of a CD is expressed in units of seconds of elapsed time.

FIG. 6 is an operation flowchart showing an outline of an operation of a conventional optical disc reproducing apparatus.

[Explanation of symbols]

 Reference Signs List 1 CD 2 Player 4 Pickup 6 Signal processing unit 7 Subcode data 8 Audio data 10 System controller 11 Audio memory controller 12 Audio buffer memory 14 Servo driver 15 Data memory controller 16 Display data table memory 17 Memory table check unit 20 Display unit

Claims (3)

[Claims] A data reading unit for reading data from an optical disk; a buffer memory for recording the read data; a signal output unit for reading data recorded in the buffer memory and outputting the data to the outside; An optical disk reproducing display device having a display device for displaying a recording position of data, comprising at least a track number, absolute time data representing a series of elapsed time from the beginning of the disk, and relative time data representing an elapsed time in the track. And a display memory for recording a time amount corresponding to the capacity of the buffer memory, and a display-corresponding absolute time obtained by subtracting the time of the data recorded in the buffer memory from the absolute time read from the optical disk. And reads relative time data corresponding to the display corresponding absolute time from the display memory, Optical disk reproducing display device characterized by comprising display means for displaying the shown device. 2. A display device according to claim 1, further comprising a memory table check unit for checking whether display data read from the optical disk exists in the display memory.
An optical disk reproduction / display apparatus according to the above. 3. The optical disk reproducing and displaying apparatus according to claim 1, wherein an index is recorded in the display memory, and the index is displayed together with the track number on the display device.