JPH05217340A - Data reproduction device - Google Patents

Abstract

PURPOSE:To display lap time from the leading position of music by conforming a timing to a signal being reproduced at present. CONSTITUTION:Main data is sent to a D/A converter 7 at a constant rate and is outputted via an LPF 8 by taking out the main data by decoding data separated at every music read from a disk 1 by a signal processing part 4, and performing read/write control on a RAM 6 for buffer by a RAM controller 5. A system controller 10 finds delay quantity between read and write based on the amount of data accumulated in the RAM 6 for buffer, and finds in-music lapse time(lap time) by subtracting the absolute time of the leading position of the music and the delay quantity from the absolute time obtained by subcode data from the signal processing part 4, then, it is displayed on a display part 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data reproducing apparatus for storing data read from a recording medium in a memory, reading the data from the memory at a constant rate and reproducing the data.

[0002]

2. Description of the Related Art Generally, in a tape recorder, a disc player or the like for recording and / or reproducing a digital audio signal or a digital video signal, the recorded digital signal is digital audio data which has been subjected to error correction coding processing or interleave processing. Many have main data such as digital video data and auxiliary data such as address information and control information. For example, in a so-called compact disc (CD) format, stereo left and right two-channel audio signals are sampled at 44.1 kHz and quantized with 16 bits to produce an audio PCM signal, and a CIRC (cross.
Interleaved Reed-Solomon code) is used as main data. This main data includes information such as identification information between songs and between songs, song number (track number), elapsed time from the beginning of each song (lap time), absolute time (absolute time), emphasis control, etc. Data, so-called sub-code data, is added as recording data, and this recording data is processed by EFM (8-
14 modulation) to obtain a recording signal.

When a compact disc (CD) having such a format is reproduced by a normal reproducing apparatus, a PLL is generally used from an EFM signal read from the disc.
A clock component is detected (clock reproduction) using a (phase locked loop) configuration, binary data is taken in by the reproduced clock, and EFM signal demodulation is performed.
The data after EFM demodulation is usually RA for decoding processing.
M is used to perform error correction based on CIRC and decoding (decoding) processing including deinterleaving to obtain a digital audio signal (PCM signal). Data is written to the decoding RAM in synchronization with the PLL reproduction clock, and data is read out in synchronization with a clock from a reference oscillator such as a crystal oscillator. The digital audio PCM signal obtained by the decoding process becomes an analog audio signal via a D / A converter and a low pass filter (LPF).

By the way, a data reproducing device, especially the above-mentioned CD
In a device equipped with an optical pickup such as a player, mechanical disturbance such as shock or vibration to the device causes
The servo system such as the focus servo and tracking servo of the optical pickup may be disconnected, and normal data reproduction may not be performed. In this case, it is impossible to deal with the error correction as described above, and there is a possibility that the reproduction is temporarily interrupted.

Therefore, the applicant of the present application has previously described that in the specification and drawings of Japanese Patent Application No. 3-25566, the reproduction data is stored in a relatively large capacity RAM for buffer and read at a constant rate. And the RAM for the buffer
By always storing a predetermined amount or more of reproduced data in the buffer, even if normal data cannot be obtained from a medium such as a disk due to a read error or the like, the buffer R
A system is proposed in which the data stored in the AM is read to compensate for interruptions in the reproduced signal such as sound breaks.

As such a system, for example, in the case of the compact disc reproducing apparatus as described above, data is read from the disc at high speed in bursts (intermittently) and sequentially written in the buffer RAM.
To read data continuously from the
When writing data to the buffer RAM, it is necessary to control the write address and store adjacent data in the RAM in a continuous state. Specifically, for example, the disc is rotationally driven at a rotation speed that is about twice or three to four times the standard rotation speed, and the data read from the disc is recorded in a sub-coding frame (sub-code block, 13.3 msec for standard reproduction). It is conceivable to write the data into the buffer RAM as a unit.

[0007]

By the way, a data reproducing device using such a buffer RAM, such as a CD, is used.
In the player, at least the data corresponding to the data stored in the buffer RAM is provided between the data read from the disc and the signal (music, etc.) read from the buffer RAM and currently being reproduced. There is a time difference of. Further, the decoded main data (PCM data) itself has auxiliary information such as the subcode data, that is, information such as a song number (track number), absolute time, in-time (lap time), de-emphasis and the like. Etc. are not left. Therefore, if the subcode data read from the disc is used to display the song number or time of the reproduced music, the above time difference causes a deviation from the music actually being reproduced, resulting in an unnatural sound. It will be displayed etc.

It is possible to store not only the main data but also the auxiliary data (subcode data, etc.) in the buffer RAM as it is, but the storage capacity of the main data is reduced by that much, and the write / read processing and The configuration is also complicated, which is not preferable.

Therefore, it is conceivable to obtain the time information corresponding to the contents currently being reproduced from the time information of the subcode data read from the disc.
In the D player, the elapsed time (lap time) from the beginning of each song is often displayed for each song, but when the song currently being played and the song read from the disc are different, , It is difficult to obtain the lap time of the song currently being reproduced by using the lap time read from the disc. Further, during special reproduction such as random reproduction or AB repeat, the RAM for buffer is actually used for accessing the disk even during reproduction.
In the case where the sub-code time information or the like cannot be read out, etc., it is difficult to obtain the time information that matches the content of the main data currently being reproduced.

The present invention has been made in view of the above circumstances, and is a data reproducing apparatus for controlling writing / reading of main data read from a medium such as a disk and reproduced to a buffer memory. In, you can get time information, etc. that have an accurate correspondence with the main data read from the buffer memory. Especially, the elapsed time (lap time) for each file (for each song) can be calculated at the time of file switching. It is an object of the present invention to provide a data reproducing device that can be accurately obtained even during special reproduction.

[0011]

In a data reproducing apparatus according to the present invention, identification information (song number) and time information of the file are included in main data (audio data, etc.) divided in file units (for example, for each song). Auxiliary data (subcode Q data) including (information on absolute time and elapsed time in song)
In a data reproducing apparatus that uses a recording medium (optical disk) on which recording data added with is recorded, and reads the recording data from the recording medium to reproduce the main data, the recording data read from the recording medium is used. A signal processing means for separating the main data and the auxiliary data, a buffer memory for storing the separated main data, and a memory control for controlling writing / reading of the main data to / from the buffer memory. Means and a delay amount between writing and reading according to the amount of reproducible data stored in the buffer memory, and the file obtained from this delay amount and the auxiliary data from the signal processing means. It is read from the buffer memory based on the identification information (song number) and the time information (especially absolute time information). It calculates the time information of the main data (absolute time information), by a control means for calculating the elapsed time (lap) from the beginning position of the current file, to solve the problems described above.

That is, the absolute time information of the main data currently being reproduced is obtained according to the absolute time information from the auxiliary data and the time of the delay amount, and the absolute time information of the main data being reproduced is currently being reproduced. By subtracting from the absolute time at the beginning of the song (file), the song (file)
Calculate the elapsed time, the so-called lap time.

Here, the buffer memory has a memory space of a ring-shaped address, and the delay amount (time difference) is determined according to the address difference from the write address to the read address. The auxiliary data is, for example, subcode Q data in a so-called CD format, and the subcode Q data includes absolute time information from the head position of the disc,
It includes time-related information such as elapsed time (lap time) information, music number (track number) information, index number information and the like for each music, and control information such as emphasis information.
The time information and the number information are displayed. Here, the time information such as the absolute time and the elapsed time in the song (lap time) is obtained by subtracting the delay time from the value of each time information obtained from the auxiliary data (subcode Q data). You can

Also, the absolute time is used as the time information obtained from the auxiliary data, the elapsed time in the file is calculated based on this absolute time and the absolute time of the head position of the file, and this elapsed time and the delay amount. It is preferable to calculate the elapsed time in the file currently being reproduced based on

Further, when a plurality of files on the recording medium are continuously reproduced, the identification information of the old file is changed to the identification information of the new file at the file boundary position of the main data read from the buffer memory. It is preferable to update.

[0016]

The time information of the main data read from the buffer memory is calculated based on the file identification information and the time information, and the elapsed time from the start position of the current file is calculated. Therefore, it is possible to obtain the in-file elapsed time whose timing coincides with the main data which is read from the buffer memory and actually reproduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a device of one embodiment in which a data reproducing device according to the present invention is applied to a so-called compact disc (CD) player. That is, the optical disc 1 has a so-called C
Recorded data in D format is recorded. Briefly explaining this so-called CD format, 1
The upper and lower 8 bits of 16-word PCM digital audio data are separated into a symbol that is an error correction coding unit.
(Cross interleaved Reed-Solomon code) adds error correction parity and interleaves. A total of 32 symbols of 24 symbols of this CIRC-encoded audio data and 8 symbols of parity
Main data of symbol is one recording unit (frame)
Then, a so-called sub code, which is 8-bit auxiliary data, is added to this, so-called EFM (8-14 modulation).
By being modulated by the method and adding the frame synchronization pattern, one frame is recorded on the optical disc 1 as an EFM signal of 588 channel bits.
The sub-code is made up of one block (sub-coding frame) in 98 frames and carries auxiliary information for eight channels P to W. The Q channel of this subcode contains auxiliary data such as the song number, index number, elapsed time within the song, and absolute time.

In FIG. 1, an optical disk 1 is rotationally driven by a drive motor 18 at a speed (for example, twice the speed) higher than a standard speed (linear speed), and an optical pickup 2 intermittently or burstly outputs a signal. It is read, amplified by the preamplifier 3, and sent to the signal processing unit 4 as a so-called RF signal. This RF signal is a signal modulated by the EFM method described above, and the signal processing unit 4 performs processing such as EFM demodulation, deinterleaving, error correction, interpolation, and subcode decoding, and the main data ( Audio PCM data) output is from the RAM controller 5
It is stored in the buffer RAM 6 via. The data transfer rate up to this point is higher than the standard reproduction rate (for example, double the rate) in response to the high-speed disk rotation drive. However, the reading of data from the optical disc 1 is performed intermittently or in a so-called burst manner, and even if the instantaneous data transfer rate is higher than the standard, the average rate including the read pause period is almost standard playback. It is a rate. In this way, the data sent to and accumulated in the buffer RAM 6 intermittently or in bursts is continuously read out at a standard reproduction rate by the RAM controller 5, and the D / A converter 7, LP
By passing through an F (low-pass filter) 8, an analog audio output signal is taken out.

The servo control circuit 9 includes, for example, a focus servo, a tracking servo, a spindle motor servo,
The sled (head movement) servo and other control operations are performed. That is, the focus servo controls the focus of the optical system of the optical pickup 2 so that the focus error signal becomes 0, and the tracking servo controls the tracking of the optical system of the optical pickup 2 so that the tracking signal becomes 0. Further, the spindle motor servo controls the rotation of the drive motor 18 so that the optical disc 1 is rotationally driven at a predetermined linear velocity (for example, a standard double linear velocity). Further, the sled servo controls the movement of the optical pickup 2 to the target track position of the optical disc 1 designated by the system controller 10. The servo control circuit 9 that performs such various control operations outputs information indicating the operating state of each unit controlled by the servo control circuit 9 to the system controller 1
I am sending it to 0.

The system controller 10 stores a CPU (central processing unit) such as a microprocessor for controlling the operation of each unit, a ROM (read only memory) in which a control program executed by this CPU is stored in advance, and various data. RAM for writing / reading and temporary storage
It is a so-called microcomputer system configured by including a (random access memory) and an I / O (input / output) circuit that transmits and receives various signals between the CPU and the outside. The system controller 10 includes a display unit 11 for displaying the operation state of each unit and a key input operation unit 12 for instructing various operations.
Etc. are connected. The display unit 11 includes, for example, an LCD
(Liquid crystal display), LED (light emitting diode) display device,
An FL display device, a plasma display device, or the like is used. The key input operation unit 12 is provided with various operation keys such as a play button, a stop button, and a fast-forward button. In addition, the system controller 10
Sends and receives signals to and from the signal processing unit 4 and the RAM controller 5 to control the operations of the signal processing unit 4 and the RAM controller 5.

Here, for example, when the servo system is disturbed due to disturbance or the like and the reproduction signal is interrupted, that is, specifically, for example, a) out of focus, b) subcode Q data When it becomes discontinuous, c) when the PLL system becomes unstable for a certain period of time, d) when interpolation processing is performed (interpolation flag is raised), etc. Monitor and
The writing to the buffer RAM 6 is interrupted. And
After the servo system is restored, for example, the address immediately before the interruption of the reproduction signal is accessed, and writing is restarted from that address position. As a result, continuous reproduction output can be obtained unless the data stored in the buffer RAM 6 becomes empty. Further, even when the data stored in the buffer RAM 6 becomes full, the writing to the RAM 6 is temporarily stopped and the pause operation or the like is started.

By the way, the RF signal input to the signal processing unit 4 is synchronized with a so-called PLL system clock including uneven rotation of the optical disc 1, whereas the main data output to the RAM controller 5 is: Since it is synchronized with, for example, a so-called crystal system clock as a reference clock, jitter exists between the two. For this reason,
If the timing of starting writing to the buffer RAM 6 depends on the absolute time obtained by decoding the so-called sub-code Q data in the signal processing unit 4, a connection error such as data loss or duplication occurs. Therefore, a data comparison block is provided in the RAM controller 5, and data of the last several samples of the data written in the buffer RAM 6 and the RA from the signal processing unit 4 are stored.
The data sent from the M controller 5 to the RAM 6 are compared with each other, and the data from the signal processing unit 4 is written to the buffer RAM 6 at the timing when these data match.

That is, FIG. 2 shows a specific example of the signal processing unit 4, and FIG. 3 shows a specific example of the RAM controller 5. In FIG. 2, the RF signal from the preamplifier 3 is sent to the EFM demodulation circuit 21, the synchronization detection circuit 22 and the PLL / timing generation circuit 23, respectively. The EFM demodulation circuit 21 demodulates the RF signal modulated by the EFM system, and sends the main data signal to the data bus DB and the subcode data signal to the subcode Q processing circuit 24. The synchronization detection circuit 22 detects the sub-coding frame synchronization signal and sends it to the PLL / timing generation circuit 23. PLL / timing generation circuit 23
Detects the channel bit clock (EFM clock) component of the RF signal and locks the PLL, and
The channel bit clock is divided by using the sub-coding frame synchronization signal to generate a word clock, a bit clock of data after EFM demodulation, and the like, and a write clock WCK is read / write control circuit 27. Send to. The PLL / timing generation circuit 23 outputs a sub-coding frame synchronization signal or the like for use in, for example, a spindle servo. Subcode Q data and the like are serially output from the subcode Q processing circuit 24 and used as current position information of the optical pickup 2 on the optical disc 1.

The main data (audio data and parity data for error detection / correction) sent from the EFM demodulation circuit 21 to the data bus DB includes a PLL / timing generation circuit 23 containing a jitter component due to uneven rotation of the optical disc 1. Data is written in the decoding processing RAM 26 by the read / write control circuit 27 in synchronization with the write clock WCK from. Thereafter, while the read / write control circuit 27 controls the read / write to the decoding processing RAM 26, error detection / correction processing and deinterleave processing are performed by the error correction processing circuit 25 based on the CIRC. .. The decoding processing RAM 26 is
In addition to the capacity required for RC decoding (for example, about 108 frames), it has a capacity for allowing a predetermined (for example, ± 24 frames) margin to absorb the above jitter. For example, a 32 kbit RAM is used. Be done. The decoded main data (PCM data) has a timing generation circuit 2 including a reference oscillator such as a crystal oscillator.
In synchronization with the read clock RCK from 9, the read / write control circuit 27 reads from the decoding processing RAM 26 and sends it to the interface circuit 28. From the interface circuit 28, the decoded main data, the bit clock BCK, and the word clock W are input.
Various clocks such as DCK, LR (for switching stereo left and right channel words) clock LRCK, etc. are output, and the RAM controller 5 and the system controller 10 are output.
Etc. Here, the write / read operation is intermittently performed at a speed higher than the standard, for example, double speed.

Next, referring to FIG. 3, the signal processing circuit 4
The input data from (the interface circuit 28 of) is
16 sample PCM sent to register 31
It is stored as data, and the system controller 10
Is permitted to write data, the data is written in the buffer RAM 6 according to the write address output from the address generation circuit 34 via the data selector 32. At this time, data writing is intermittently performed at a speed faster than the standard. Data is read from the buffer RAM 6 via the data selector 32 in accordance with the read address output from the address generation circuit 34 to the register 33.
Sampling frequency (eg 44.1k
It is continuously output from the register 33 at a constant reproduction rate according to (Hz) and sent to the D / A converter 7.

Here, the buffer RAM as described above
When the writing to 6 is suspended and then the writing is resumed, that is, when data connection is performed, the address when the last data is written to the buffer RAM 6 is output from the address generation circuit 34, and the data is used for the buffer. It is taken into the register 35 from the RAM 6 via the data selector 32. This data is compared with the data input to the register 31 from the signal processing unit 4 by the data comparator 36, and when both match, a coincidence output is output to determine the timing of data connection. That is, the input data from the next signal processing unit 4 for which a coincident output is obtained may be written in the buffer RAM 6.

Next, FIG. 4 schematically shows the write / read operation for the buffer RAM 6 in the memory space, and FIG. 5 shows an example of the internal configuration of the address generation circuit 34. 4 and 5, in FIG.
When the write enable signal W-EN from the system controller 10 is sent to the write address counter 13, the write address counter 13 operates and the write address is advanced (incremented) at a speed faster than the standard. W
A is generated. Data is written in the buffer RAM 6 by the write address WA. Further, the system controller 10 or the like checks the subcode information or the like to check for skipped sounds, etc., and sends a good state signal SOK to the effective write address latch 14 if there is no problem. Effective write address latch 14 latches write address WA from write address counter 13 in response to this signal SOK, and outputs it as effective write address VWA. The stored data up to the address VWA is reproducible data with no skipped sound, and can be sent to the D / A converter 7.

The read address counter 15 operates in response to the read enable signal R-EN from the system controller 10 to advance the read address RA at the standard speed.
And the data written in the buffer RAM 6 are sequentially read. Since the step speed (write speed) of the write address WA is higher than the speed (read speed) of the step (increment) operation of the read address RA, the address WA is the address RA in the loop memory space. However, at this time, the stepping operation of the write address WA is stopped, and the writing is restarted when the read address RA advances and the remaining amount of data falls below a predetermined amount (the step of the write address WA. Restart the advancing operation). The remaining amount of data at this time indicates the amount of actually reproducible data from the valid write address VWA to the read address RA. The subtracter 16 obtains the address difference ΔA by subtracting the address RA from the address VWA.

Here, the data read from the buffer RAM 6 and sent to the D / A converter 7 and the system controller 1 obtained by the subcode Q processing circuit 24 and the like.
The time difference between the subcode time information held by 0 is the sum of the delay amount in the decoding process RAM 26 and the delay amount in the buffer RAM 6 and is the delay amount in the decoding process RAM 26. Is about ten and several msec including the above-mentioned jitter correction amount, and can be ignored in the case of time display or the like. Therefore, only the delay amount in the buffer RAM 6 is taken into consideration in the following description.

Therefore, the time difference Td between the actual reproduction data and the time information of the subcode is the address difference ΔA.
The data amount Dm corresponding to (= VWA-RA) is divided by the data read rate Dr. RAM 6 for buffer
If the number of bits of the storage unit (word) for one address is n bits, the time difference Td is as follows: Td = Dm / Dr = (n × ΔA) / Dr (1)

From the above, the system controller 1
For 0, the subcode information received from the subcode Q processing circuit 24 or the like of the signal processing unit 4 may be delayed by the time difference Td to perform control operations such as actual time display and de-emphasis switching. That is, the display unit 11
Absolute time T _ABS and elapsed time in the song (lap time) T
When displaying the _{LAP and the} like, it is _sufficient to display the values obtained by subtracting the time difference Td from the absolute time T _QABS and the in-tune time T _{QLAP and the} like obtained from the sub-code Q information, and switching control such as de-emphasis is performed. Also in the case of switching, it is possible to match the content of the reproduced audio signal by delaying and switching the time difference Td. The same applies to the display of song numbers (track numbers) and index numbers.

Further, even in a special reproduction state such as pause (pause) and re-beat between A and B, the time difference Td is taken into consideration to perform control so that the display, audio output and key operation are performed between the apparatus. You can avoid giving it an unnatural feel.

For the address difference ΔA, it is not necessary to obtain all the bits of the address (for example, 20 bits).
You may make it use about several high-order bits according to the required precision. Here, as a specific example of the buffer RAM 6, the storage capacity is such that the bit number n of one word is 4 bits and the address bit number is 20 bits (A _{0 to} A ₁₉ ).
When using an M-bit memory, the upper 4 bits (A ₁₆
When to A ₁₉₎ using only becomes distinguishable accuracy 0.25M bits. The data read rate Dr is about 1.
When it is set to 4 Mbits / sec, the data amount [M bits] with respect to the value of the upper 4 bits (A _{16 to} A ₁₉ ) of the 20-bit address (A _{0 to} A ₁₉ ) representing the address difference ΔA and the time conversion amount [Second. Frame] is shown in Table 1 below.

[0034]

[Table 1]

However, in this case, an error may occur in the calculated data, and the time may be returned when the elapsed time of the CD is displayed. In such a case, an unnatural feeling can be prevented by using a program so that the calculated value does not decrease due to the error.

Further, the address difference ΔA is displayed on the display unit 11 by a numeral or a visual representation of the quantity so that the user of the device can know the remaining memory capacity of the buffer RAM 6 and the memory storage data quantity. Can inform,
This is useful for checking the operating status. Here, the display that expresses the visual amount is, for example, the buffer RAM 6
And a fixed display element that represents a container that reminds of
6 and a variable display element that expresses the reproducible data amount stored in the storage device 6.

Next, the elapsed time from the beginning position of each song,
The display of the so-called lap time T _LAP will be described.
About this lap time T _LAP , the buffer R
The time difference (delay amount) Td between writing and reading determined according to the reproducible data amount Dm in the _AM6 may be _calculated by subtracting from the lap time T _QLAP of the subcode Q data, but switching of the song or T for special playback
_Considering that the relationship between _QLAP and T _LAP is disturbed, the lap time T _QLAP of subcode Q data is not directly used,
Seeking lap time T _LAP absolute time of the subcode Q data from the (absolute time) T _QABS using what obtained by subtracting the delay amount Td.

The calculation of the lap time T _LAP is roughly divided into three types. (A) Track number (song number) of subcode Q data
And the track number of the song (file) currently read out from the buffer RAM 6 is the same. (B) When the track number of the subcode Q data and the track number of the song being played back are different due to switching of the song or the like during normal playback.

(C) When the track number of the subcode Q data and the track number of the song being reproduced are different during special reproduction such as shuffle or random reproduction, program reproduction, and AB repeat reproduction. Is.

Here, in any of the above cases (a) to (c), the index number is "00".
There is a difference in the display at the time of and the time other than "00". That is, the index number "00" is a silent part before the start position of the song, and a minus number is displayed so that the start position of the song becomes "00:00" (0 minutes 0 seconds). It is necessary to change the displayed numbers. Then, when the head position of the song is reached, the index number becomes "01", and a number that increases according to the elapsed time is displayed. This will be described with reference to FIG. 6. In the area of the index number “00”, the sub-code Q increases as it moves away from the top position TOP of the music (to the left in the drawing).
The frame value of the lap time T _QLAP obtained from the data increases from “00”, and the value of seconds also increases from 0 although not shown. Therefore, while reading the area of the index "00" along the reproduction direction, the lap time T _QLAP of the subcode Q is detected as a value that decreases toward 0, and when the head position TOP of the music is reached, the index " When it enters the area of "01", it is detected as a value increasing from 0.

Also, the absolute time T _QABS or T in the time information
_In order to obtain the lap time T _QLAP or T _LAP which is the elapsed time from the _ABS top position TOP from _ABS , first, the top position TOP of the music, that is, the index number is “01” and the lap time T _QLAP is “00:00. It is necessary to obtain the head position time (hereinafter referred to as the top time) T _TOP which is the absolute time at the position “(0 minutes 0 seconds 0 frame)”. This top time T _TOP is subcode Q
Absolute time T _QABS and lap time T obtained from data
_{According to QLAP} , when the index number is “00”: T _TOP = T _QABS + T _QLAP +00: 00.01 (2) When the index number is other than “00”: T _TOP = T _QABS −T _QLAP ... ( It is calculated by each formula of 3). In the above formula (2), "00:00
The value "0.01" takes into consideration that the frame immediately before the head position TOP is "00" in the area of the index "00" in FIG. Such a top time T _TOP is calculated and calculated each time a song is changed, and is saved in a memory or the like.

Also, from the delay amount (time difference between writing and reading) Td in the buffer RAM ₆ and the absolute time T _QABS of the subcode Q data, the absolute time T _ABS of the main data being reproduced is _ABS = T _QABS −Td (4) Absolute time T currently playing
_It is determined whether the _ABS is before or after the top time T _TOP obtained by the equations (2) and (3). It is possible to determine that the index number is "00" if it is before and the index number is other than "00" if it is after. In addition, the absolute time T _ABS during reproduction obtained from the equation (4), the top time T _TOP, and the end time T _END described later.
By comparing with, it is determined whether or not the position currently being reproduced is in the same track (in the same song). Then, in the same track, that is, in the case of (a) above, depending on the index number of the position currently being reproduced, other than the index number "00": T _LAP = T _ABS -T _TOP ... (5) When the index number is “00”: T _LAP = T _TOP −T _ABS (6) The lap time T _LAP of the main data being reproduced is calculated and displayed on the display unit 11.

FIG. 7 is a diagram showing the respective times in the case of (a) above. The track number (song number) N _SUBQ of the subcode Q of the data read from the disk and the buffer RAM 6 are read. This shows the case where the track number N _PB of the main data currently being reproduced is the same value “01”. FIG. 8 shows the above case (b), that is, the case where the track number N _SUBQ of the subcode Q data and the track number N _PB of the song being reproduced are different during normal reproduction. Further, FIG. 9 shows the case (c), that is, the case where the track number N _SUBQ of the subcode Q data and the track number N _PB of the song being reproduced are different during the special reproduction. In these figures, the delay amount (time difference between writing and reading) Td is shown as a constant for simplification of description, but in reality, it is high-speed and intermittent writing and a constant rate. The Td is dynamically changed depending on the reading.

In the case of (a) shown in FIG. 7,
The relationships of the expressions (4) to (6) described above are directly applied. In FIG. 7, the absolute time T _{QABS at} the boundary between “00” and “01” of the index number I _SUBQ of the sub code Q data, that is, the absolute time T _QABS is the top time T _TOP and the index number I _SUBQ. Is "0
The difference between the absolute time T _QABS and the lap time T _QLAP is the top time T _TOP when it is other than 0 (when it is “01”, “02”, etc.). The absolute time T _ABS of the main data being reproduced is obtained by subtracting the delay amount Td from the absolute time T _QABS of the sub code Q by the equation (4), and the lap time T _LAP being reproduced is obtained from the _equation (5). ), The top time T _TOP is subtracted from the absolute time T _ABS during reproduction. This lap time T
Display the _LAP . Also, the track number (song number) N _PB and index number I _{PB that} are being reproduced are set as display values (display track number and display index number), respectively, and displayed on the display unit 11 or the like in FIG. The index number _IPB of the main data currently being reproduced is "0.
When it is "0", a negative value of the lap time T _LAP is displayed by the calculation of the above formula (6).

Next, in the case of the above (b) shown in FIG.
While performing the display in the case of the above (a), the timing at which the track number (music number) N _QSUB is switched by the subcode Q data is constantly monitored. The subcode Q absolute time T _QSUB immediately before this track is switched to the end time T
_It is detected as _END and saved in memory etc. Until the absolute time T _ABS during the reproduction reaches the end time T _END , the top time T _TOP1 of the previous track number “01” is used to calculate the above equations (4) and (5). The lap time T _LAP is obtained and displayed, and the displayed track number (track number N _{PB being} reproduced) and the like also hold the numerical value of the previous track. After the absolute time T _ABS during playback reaches the above end time T _END , the above (2),
The lap time T _LAP is calculated by using the top time T _TOP2 of the track number “02” obtained by the equation (3),
Display this. Further, the track number N _PB and index number I _PB of the main data being reproduced at this time are displayed on the display unit 11 and the like as the display track number and the display index number, respectively.

Next, FIG. 9 shows the case of the above (c), where there is a portion where the subcode Q data cannot be obtained due to the disk access operation, and the absolute time T of the subcode Q is
_QABS is not continuous. For this reason, a flag (special reproduction flag) F _SP that is turned on during the access operation is provided, and this flag F _SP is used for determining time information during reproduction and the like. FIG. 9 shows an example in which the track number is changed from the track number "01" to the track number "05" in the program reproduction or the like.

In the case of FIG. 9, first, the end time T _END on the track “01” is detected and saved in a memory or the like. With special playback access,
"0" in the index "01" of the target track "05"
Since the position of "0: 00.00" (0 minutes 0 seconds 0 frame) is accessed, it is not necessary to reproduce or display the area of the index "00". In this case, if the lap time T _LAP of the subcode Q is subtracted from the delay amount (time difference) Td of the buffer RAM 6, the remaining time (hereinafter referred to as rest time) T _{REST of} the current track is obtained, and this rest time T _{When REST} becomes 0,
Since the main data being reproduced is transferred to the next target track "05", the flag F _SP is turned off. Therefore, the lap time T _{LAP is calculated by the following equation} : T _REST = Td-T _QLAP (6) T _ABS = T _END -T _REST (7) T _LAP = T _ABS -T _TOP (8) Is derived.

As described above, since the absolute time is mainly considered, so-called remaining display can be performed without any problem. It should be noted that an error of about 0.2 seconds may occur in an actual device due to the calculation error of the value of the delay amount Td, and the value of the lap time T _LAP or the like obtained by the above-described calculation is It may be smaller than the value obtained in. Therefore, it is preferable to compare the calculated value with the previously calculated value and adopt a larger value.

FIGS. 10 and 11 are flowcharts for explaining the procedure for calculating the lap time T _LAP in the case of the three types as described above, and the connectors A and B in FIG.
Are connected to the respective connectors A and B in FIG. In these FIGS. 10 and 11, in the first step S41, the delay amount (time difference) Td according to the above equation (1) is calculated and obtained. Next, in step S42, the special playback mode (that is, shuffle or random playback,
It is determined whether or not the special reproduction flag F _SP indicating that the program reproduction, AB repeat reproduction, etc.) is on. When it is not in the special reproduction mode (when the flag F _SP is off), it is the case other than the above (c), that is, the above (a) and (b), and the process proceeds to the next step S43.

In step S43, the absolute time of the main data being reproduced is obtained by subtracting the delay amount Td from the absolute time T _QABS obtained from the sub-code Q data. The calculated value at this time is calculated. Instead of using T _ABS immediately, it _{uses the} temporary absolute time T _LABS . This is the next step S4
In 4, the absolute time T _ABS obtained in the previous calculation is compared with the calculated value (above-mentioned temporary absolute time) T _LABS, and T _ABS is compared.
Only when T _LABS is larger than _ABS (T _ABS <T _LABS ), T _{LABS is set} to T _ABS in the next step S45, and otherwise, the absolute time T _ABS previously obtained is used as it is to display This avoids such a problem that the value of the time taken is reduced. That is, step S
If YES in 44 (T _ABS <T _LABS ), step S4
In step 5, the absolute time T _ABS is updated and the process proceeds to the next step S46. If NO, the process directly proceeds to step S46.

In step S46, it is determined whether or not the track number (song number) N _SUBQ of the subcode Q data from the disc is the track number N _PB of the main data currently being reproduced. If YES (same track number) Step S
Proceed to 47. In step S47, it is determined whether or not the index number _IPB being reproduced is "00", and if NO, the process proceeds to step S48. In step S48, it is determined whether or not the index number I _SUBQ of the subcode Q is "00", and if NO, the process proceeds to step S49. Step S
In 49, the track number N _SUBQ of the subcode Q is _set as the track number N _{PB being} reproduced, and the index number I _PB being reproduced is set to “01”. This is because in the case of a device that does not display an index, all index numbers of “02” and above are treated as “01”. In the next step S50, the lap time T _LAP is calculated by calculating the above equation (5). After that, the process proceeds to step S51, the emphasis and the mute are controlled, and the process ends.

When NO is determined in the above step S46, that is, when the track number N _SUBQ of the subcode Q and the track number N _PB being reproduced are different, the process proceeds to step S52. In this step S52, the end time T _END is compared with the absolute time T _ABS during reproduction, and if the end time T _END is T _ABS or more, the process proceeds to step S50, and the end time T _END is greater than T _ABS. If it is smaller, the process proceeds to the next step S53 to calculate the top time T _TOP , and then the step S54.
Proceed to. In addition, YES (I _PB = 0 in step S47)
0), or YES (I
_Also when _SUBQ = 00), the process proceeds to step S54.
In this step S54, it is determined whether or not the top time T _TOP is equal to or less than the absolute time T _ABS during reproduction. If YES, the process proceeds to step S49, and if NO, the process proceeds to the next step S55. In step S55, the track number N _SUBQ of the subcode Q is reproduced and the track number N _PB of the track being reproduced.
And the index number _IPB being played is set to "0.
0 ”. In the next step S56, the lap time T _LAP is obtained by calculation, the process proceeds to step S57, and after the flag F ₀₀ indicating that the main data of the index number “00” is being reproduced is turned on, the process proceeds to step S51. ..

When it is judged as YES (the special reproduction flag F _SP is ON) in the above step S42, FIG.
In step S61, it is determined whether the delay amount Td of the buffer RAM _{6 is} less than or equal to the _wrap time T _QRAP of the subcode Q data. If NO, the next step S6
Go to 2 and calculate the rest time T _REST , that is, T
The calculation of d-T _QLAP is performed, then the process proceeds to step S63, and the temporary absolute time T similar to that of step S43 described above is used.
Calculate _LABS . The following steps S64 and S65
Similar to steps S44 and S45 described above, these steps S63 to S65 avoid the problem that the value of the displayed time decreases. Next step S6
In 6, the lap time T is calculated by calculating T _ABS -T _{TOP.
After obtaining the LAP} , the process proceeds to step S51 in FIG. When YES (Td ≦ T _QRAP ) is determined in the above step S61, the process proceeds to a step S67, and the special reproduction flag F _SP
Is turned off, and in step S68, the track number N _SUBQ of the subcode Q is _set to the track number N _PB being reproduced, and
The index number _IPB during reproduction is set to "01".
Further, in the next step S69, "00: 00.00", that is, 0 minute 0 second 0 frame is set in the lap time T _LAP , and then the process proceeds to step S51 in FIG.

As is clear from the above description, according to this embodiment, it is sufficient to store the main data in the memory (buffer RAM 6), the memory capacity can be effectively used, and the information of the write data can be used. The read main data can be controlled with. Also, the absolute time T _QABS and the elapsed time in the song (lap time) T based on the subcode Q data
Time T of the delay amount in the buffer RAM 6 from _QLAP or the like
Only by subtracting d, the time information (T _ABS or T _LAP
Etc.) can be obtained, an appropriate display can be performed, and the amount of reproducible data in the buffer RAM 6 can be displayed to notify the operating state of the device. Further, it is possible to control reproduction data such as de-emphasis switching at the correct timing. Furthermore, when displaying the so-called lap time, which is the elapsed time within the song, the track being played back is different from the track of the subcode Q data, or even in the special playback mode, it matches the content of the main data being played. The calculated lap time can be calculated, and the lap time without error can be displayed.

The present invention is not limited to the above-described embodiments, and for example, as the recording medium, a magneto-optical disk, a magnetic disk, a magnetic tape or the like can be used in addition to the optical disk, and the format is so-called. It is not limited to the CD format. In addition to PCM audio data, video data, compressed data, etc. can be used as the main data. Further, the auxiliary data is not limited to the above subcode data, and can be applied to a format in which error correction processing is not performed. Of course, the hardware configuration is not limited to the illustrated example.

[0056]

As is apparent from the above description, according to the data reproducing apparatus of the present invention, the identification information (song number) of the file is added to the main data divided in file units (for example, for each song). And recording information to which auxiliary data including time information (absolute time and elapsed time in song) is added, is read from the recording medium, and the read data is separated into the main data and the auxiliary data, Write / read control of the separated main data to / from the buffer memory is performed, and a delay amount between writing and reading according to the amount of reproducible data stored in the buffer memory, and The time information of the main data read from the buffer memory is calculated based on the file identification information and the time information obtained from the auxiliary data, and Since the elapsed time (lap time) from the beginning position of the file is calculated, it is possible to obtain time information that has an accurate correspondence with the main data read from the buffer memory, especially for each file. The elapsed time (lap time) of each song can be accurately obtained even at the time of file switching or special reproduction.

In particular, the absolute time information of the main data currently being reproduced is obtained according to the absolute time information from the auxiliary data and the time of the delay amount, and the absolute time information of the main data being reproduced is currently being reproduced. By subtracting from the absolute time of the beginning position of the song (file), the elapsed time within the song (within the file), so-called lap time, can be easily and accurately obtained.

When a plurality of files on the recording medium are continuously reproduced, the identification information of the old file is changed to the identification information of the new file at the file boundary position of the main data read from the buffer memory. By updating, the file identification information (song number) can be displayed in conformity with the main data being reproduced.

Further, since the recording data in which the auxiliary data is added to the main data is read from the recording medium to separate the main data and the writing / reading is controlled with respect to the buffer memory, the buffer memory is controlled. It is sufficient to store only the main data, and the effective utilization rate of the storage capacity can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall schematic configuration of an embodiment of a data reproducing apparatus according to the present invention.

FIG. 2 is a block circuit diagram showing a specific example of a signal processing unit in the above embodiment.

FIG. 3 is a block circuit diagram showing a specific example of a RAM controller in the above embodiment and its periphery.

FIG. 4 is a diagram for explaining movement of a write address and a read address in the memory space of the buffer RAM in the above embodiment.

5 is a block diagram showing an example of an internal configuration of an address generation circuit in FIG.

FIG. 6 is a diagram for explaining the relationship between index numbers and frames.

FIG. 7 is a diagram showing time information when the track number of subcode Q data and the track number being reproduced are the same.

FIG. 8 is a diagram showing time information when the track number of subcode Q data and the track number being reproduced are different during normal reproduction.

FIG. 9 is a diagram showing time information when the track number of subcode Q data and the track number being reproduced are different during special reproduction.

FIG. 10 is a flowchart for explaining the operation of the above embodiment.

FIG. 11 is a flowchart for explaining the operation of the above embodiment.

[Explanation of symbols]

 1 ... Optical disc 2 ... Optical pickup 4 ... Signal processing unit 5 ... RAM controller 6 ... Buffer RAM 9 ... Servo control circuit 10 ... System controller 11 ... Display unit 12 ... Key input unit 21 ... EFM demodulation circuit 23 ... PLL / timing generation circuit 24 ... Sub-code Q processing circuit 25 ... Error correction processing circuit 26 ... Decoding processing RAM 27 ... Read / write control circuit 29 ... Timing generation circuit 31, 33 , 35 ... Register 36 ... Data comparator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Toru Tsunono 134 Toyohama Business Park East Tower 11F Kobe Tower, Hodogaya-ku, Yokohama, Kanagawa Prefecture Sony LSI Design Co., Ltd.

Claims (3)

[Claims] 1. A recording medium in which recording data in which auxiliary data including identification information and time information of the file is added to main data divided in file units is used, and the recording data is recorded from the recording medium. In a data reproducing apparatus for reading and reproducing the main data, a signal processing means for separating the main data and the auxiliary data from the recording data read from the recording medium, and a buffer for storing the separated main data. Memory, a memory control means for controlling writing / reading of the main data to / from the buffer memory, and a writing / reading period according to the amount of reproducible data stored in the buffer memory. Of the file identification information obtained from the delay amount and the auxiliary data from the signal processing means, and Based on the time information,
A data reproducing apparatus comprising: control means for calculating time information of the main data read from the buffer memory and for calculating an elapsed time from the current head position of the file. 2. The absolute time is used as the time information obtained from the auxiliary data, the elapsed time in the file is calculated based on this absolute time and the absolute time of the head position of the file, and the elapsed time and the delay amount are calculated. 2. The data reproducing apparatus according to claim 1, wherein the elapsed time in the file currently being reproduced is calculated based on 3. When reproducing a plurality of files on the recording medium continuously, at the boundary position of the file of the main data read from the buffer memory, the identification information of the old file is changed to the identification information of the new file. The data reproducing apparatus according to claim 1, which is updated.