JPH06162744A - Reproducing device - Google Patents

Abstract

PURPOSE:To reduce the burden on a control means by generating a display time independently of reproduced data to display it as the reproducing time at the time of fast-forwarding reproducing and fast-rewinding reproducing and starting reproducing from a position corresponding to the display time at the time of switching back to the reproducing mode. CONSTITUTION:When a fast-forwarding/fast-rewinding operation key 13 is depressed during reproducing, a system controller 9 is switched from the reproducing mode to the fast-forwarding/fast-rewinding mode to mute the audio output and counts up/down the display time at about 10-fold speed of normal reproducing. When the fast-forwarding/fast-rewinding key is released, the controller 9 is switched back to the reproducing mode to release muting of the audio output and calculates an address on a disk corresponding to the display time displayed on a display device 14 to restart reproducing of a compressed audio signal from this address. Thus, the burden-of the system control means is reduced.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problems to be Solved by the Invention (FIGS. 7 and 8) Means for Solving the Problems (FIGS. 1 to 4) Actions (FIGS. 5 and 6) Embodiments (FIGS. 1 to 1) (FIG. 6) (1) Overall configuration of the embodiment (FIGS. 1 to 4) (1-1) Configuration of the disk reproducing device 1 (FIGS. 1 to 3) (1-2) Time display processing procedure (FIG. 4) 2) Operation and effect of the embodiment (FIGS. 5 and 6) (3) Other embodiment Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus, which is suitable for application to reproducing an audio signal from a magneto-optical disk, for example.

[0003]

2. Description of the Related Art Conventionally, a disk reproducing apparatus and a disk recording / reproducing apparatus capable of reproducing information from both a magneto-optical disk and a compact disk and recording desired information on the magneto-optical disk as many times as possible have been considered. There is.

By the way, when this disk recording / reproducing apparatus is used for reproducing an audio signal recorded on a magneto-optical disk or the like, it is considered that the disk recording / reproducing apparatus is often used outdoors or the like, which is susceptible to external vibrations, and therefore a large vibration is applied. Also, a technique for improving vibration resistance by using a semiconductor memory is being studied so that data reading is not interrupted and sound skipping does not occur.

This anti-vibration technology is compressed to about 1/5,
The audio data recorded after the error correction processing is read from the magneto-optical disk at a speed of 1.4 [Mbit / s], and the decoded audio data is once written in a random access memory (hereinafter referred to as RAM).

Subsequently, the audio data which has been compressed is continuously read from the RAM at a speed of 0.3 [Mbit / s] and expanded to the original data length to improve the vibration resistance. . Incidentally, at this time, the audio data is read out intermittently from the magneto-optical disk.

In this way, by storing the audio data up to several seconds ahead of the audio data to be actually reproduced in the random access memory, even if the data cannot be taken in due to a large vibration, the data can be reproduced again. By playing back the stored data until the reading is started, it is possible to prevent the occurrence of sound skip.

[0008]

The outer circumference and the inner circumference of this magneto-optical disk are respectively allocated to a data area that can be freely rewritten by the user and a data area that cannot be erased by the user, and each area is further divided into two areas. It is designed to be divided into two areas.

That is, on the outer peripheral side of each area, there is provided a data recording area for recording a data unit (hereinafter referred to as a cluster) formed by combining a plurality of data divided into predetermined block units (hereinafter referred to as a sound group), and On the inner side, table information other than music data (TOC (Table Of Const
A lead-in area for storing tents) data) is provided.

Here, one cluster, which is a basic unit for writing and reading data to and from each area, is composed of 36 sector data. In the case of a magneto-optical disk for recording, the first 3 sectors of this 1 cluster are allocated to the link sector L as a redundant sector, the next 1 sector is allocated to the sub data S, and the remaining 32 sectors are compressed data. It is assigned (FIG. 7 (A)).

Incidentally, one sector is composed of a sync area of 12 bytes from the head, a header area of 4 bytes, a sub-header area of 4 bytes, and a compressed data area of 2332 bytes, and a cluster number from the head to the header area. ,
2 bytes, 1 byte, and 1 byte are assigned as the sector number and the mode area (FIG. 8).

Further, one sector of the compressed data area has two left and right sides.
Five sound groups each having one channel data and left channel data, or right channel data and five sound groups are assigned (FIG. 7 (B) and FIG. 7 (C)). Compressed data of 424 bytes) is handled as one unit (Fig. 7).
(D)).

Therefore, in this type of disk recording / reproducing apparatus, all the processes are executed based on the header data read from all the unit data having the above-mentioned data structure.

However, when trying to perform fast forward reproduction or rewind reproduction of the data, the time that can be spent for processing the header data is limited, and it becomes difficult to control the timing of loading the audio data into the RAM, or the data is scattered on the disk. The process for linking audio data has to be complicated.

Further, since the time display is obtained based on the address information of the audio signal to be reproduced and the compression ratio of the data (Japanese Patent Application No. 4-151131), the header information and the amount of memory accumulated in the memory during the fast-forward and fast-reverse reproduction periods. To calculate the playback time based on this, the burden on the microprocessor must be increased. Also, if the control is erroneous even a little, an abnormal sound may be output as the reproduced sound.

The present invention has been made in consideration of the above points, and proposes a reproducing apparatus capable of realizing a simple time display without burdening the control means during fast-forward reproduction or fast-reverse reproduction. Is what you are trying to do.

[0017]

In order to solve such a problem, in the present invention, the recording data read from the optical disk 3 in a predetermined unit is once written and stored in the storage means 10, and the stored recording data is sequentially stored. In a disk reproducing device which outputs recorded data in a time series continuously by reading, a first operation unit 13A for instructing fast-forward reproduction.
A second operation unit 13B for instructing rewind reproduction, and a first operation unit 13B
Alternatively, when the display time generation means 9 for generating time information according to the operation of the second operation portion 13A or 13B and the first or second operation portion 13A or 13B are released, the display time generation means 9 is used. The control means 9 is provided for stopping the generation of the time information, reading the record data from the position corresponding to the time displayed by the display time generating means 9, and restarting the reproduction.

[0018]

When the first or second operation section 13A or 13B is depressed, the time information of the display time generating means 9 generated independently of the address information of the reproduction data is displayed as the reproduction time. , The first or second operation unit 13A or 13
When the key B is released, the recorded data is reproduced from the position corresponding to the display time generated by the display time generating means 9 until immediately before, so that the system control means takes a heavy burden on the system management even in the normal reproduction. Can reduce the burden.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Overall Configuration of Embodiment (1-1) Configuration of Disk Reproducing Device 1 In FIG. 1, reference numeral 1 indicates the entire disk reproducing device,
An optical disk 3 is rotated by a spindle motor 2 to irradiate a light beam from an optical pickup 4, and a high frequency amplifier circuit 5 amplifies a reproduction signal which is a received output of reflected light.

The disk reproducing apparatus 1 supplies the amplified reproduction signal to the servo control circuit 6 and the decoder 7
Supply to. Here, the servo control circuit 6 controls the rotation speed of the spindle motor 2 on the basis of the reproduction signal, and also controls the tracking and focus of the optical pickup 4.

On the other hand, the decoder 7 outputs the reproduction signal to 2
The value data is demodulated, the EFM decoding process and the error correction process are performed on the value data, and the corrected reproduction data is supplied to the RAM control circuit 8 as compressed audio data.

When the compressed voice data is input, the RAM control circuit 8 gives the compressed voice data to the system controller 9 which is a microcomputer (hereinafter referred to as a CPU), and the direct access to the RAM 10 by the system controller 9 and the sound group as a unit. Error correction, etc.
Performs various processes.

In the case of this embodiment, the storage area of the RAM 9 is 1 [Mbit], and 44 sectors of main data, 6 or more sectors of TOC (Table Of Contents) data, and error flags are stored separately. (Fig. 2).

The data expansion circuit 11 has a capacity of 0.3 [Mbit /
from the audio compression data read in [s]
[bit / s] voice data is demodulated, and this is digital / analog conversion circuit 12 (hereinafter D / A conversion circuit 12)
It is designed to be supplied to and converted into an audio signal.

At this time, the system controller 9 controls the operation state of the entire disk reproducing apparatus 1 and adds various control data to the header area and sub-header area of each sector constituting the reproduction data.

When the compressed audio data is written in the RAM 10, the system controller 9 writes the track number in the mode area which is undefined when it is read from the magneto-optical disk, and the error information in the sector in the sub header area. And add the end position of audio data in units of sound groups and write (FIG. 8).

When the compressed audio data is read from the RAM 10, the time information and control information of each sector are RA.
The reproduction time and the remaining time are read out from the M control circuit 8 and displayed on the display 14 according to the instruction of the operation key 13 and the reproduction status is managed.

In the case of this embodiment, the system controller 9 is adapted to change the processing mode from the reproduction mode to the fast-forward mode or the fast-reverse mode based on the key depression operation of the operation key 13 during the reproduction (FIG. 3). The count value of the display counter obtained independently of the data is displayed on the display 14.

That is, when the fast-forward key 13A is pressed during reproduction, the system controller 9 shifts from the reproduction mode to the fast-forward mode to mute the audio output and counts up the display time by about 10 times the normal reproduction. . The system controller 9 also increments the music number at the same time when the reproduction time displayed at this time exceeds the reproduction time of one music.

On the other hand, when the fast-reverse key 13B is pressed during the reproduction, the system controller 9 shifts from the reproduction mode to the fast-reverse mode to mute the audio output and displays the display time at about 10 times during the normal reproduction. When the reproduction time exceeds the reproduction time of one music piece, the music piece number is decremented at the same time as in the fast-forward mode.

When the fast-forward key 13A or the fast-reverse key 13B is released, the system controller 9 returns to the reproduction mode to cancel the audio output muting and, at the same time, the display corresponding to the display time displayed on the display 14. The upper address is obtained, and the reproduction of the compressed audio signal is restarted from the calculated address.

Incidentally, the system controller 9 corrects the compression rate based on the link information for connecting the address information recorded on the TOC table or the user TOC table and the same track data scattered on the magneto-optical disk. Then, the address on the magneto-optical disk 3 is obtained.

(1-2) Processing procedure for time display during fast forward or fast reverse In the case of this embodiment, the system controller 9 displays the display time according to the processing procedure shown in FIG. There is. That is, when the reproduction mode is instructed by the operation of the operation key 13, the CPU reproduces the reproduction routine (step S).
After entering P1), proceed to the following step SP2.

Here, the CPU determines whether or not the fast-forward key 13A is pressed, and when a positive result is obtained, after muting the audio output (step SP3), the timer provided for time display is activated. The time axis is counted up at a speed about 10 times faster than that in normal reproduction (step SP4).

Thereafter, the CPU displays the value on the time axis as the reproduction time on the display 14 (step SP
5) At the next step SP6, it is determined whether or not the fast-forward key 13A is released.

On the other hand, if a negative result is obtained in step SP2, the CPU proceeds to step SP7 to determine whether or not the fast-return key 13B is pressed instead of the fast-forward key 13A.

If a positive result is obtained here, the CPU proceeds to step SP8 to mute the audio output,
Subsequently, the time axis of the timer used for time display is counted down at a speed of about 10 times that in normal reproduction (step SP9).

Then, the value of this time axis is displayed on the display 14 as the reproduction time (step SP1
0), in the next step SP11, the fast reverse key 13B
It is determined whether or not has been released, and the process repeatedly returns to step SP8 until a positive result is obtained.

CPU is step SP6 and step SP
Affirmative results were obtained in 11 and fast forward key 13A
Alternatively, when it is determined that the key pressing operation of the fast-reverse key 13B is completed, the process moves to step SP12 and the current display 1
The address on the magneto-optical disk 3 where the audio signal of the display time displayed on 4 is recorded is obtained by arithmetic processing.

Thereafter, the CPU moves to step SP13 and supplies a drive signal to the optical pickup 4 so that the data can be reproduced from the address obtained in the previous step SP12,
Data reading is restarted from the optical pickup moved to the predetermined address.

The CPU waits for the resumption of the reading and releases the audio output muting (step SP1).
4) While in the reproduction mode, the process returns to step SP2 to wait for the next operation.

If a negative result is obtained in step SP7 (that is, neither the fast-forward key 13A is pressed nor the fast-reverse key 13B is pressed), the CPU proceeds to step SP15. Other routine processing is executed and then the process returns to step SP2.

(2) Operation and effect of the embodiment In the above configuration, for example, as shown in FIG. 5, the start address and the end address of the track (song) at the time of "00 minutes 12 seconds" of the second track (song). If the fast-forward key 13A is pressed during reproduction of the audio output, the CPU of the system controller 9 shifts from step SP2 to step SP3 to mute the audio output (FIG. 5).

Subsequently, the time axis of the timer for displaying the current display time is made independent from the control based on the reproduction address,
While the fast-forward key 13A is being pressed, the count value is incremented at about 10 times the speed during normal reproduction (steps SP4 to SP6).

If the user then removes his finger from the fast-forward key 13A at "01 minutes 41 seconds", the CPU proceeds to the calculation and retrieval of the address in which the audio output at that time is stored.

That is, in the CPU, the sound group (SG) which is the minimum data unit is about 11.6 [ms], one sector is composed of 5.5 sound groups, and the compressed data area in one cluster. Using the relation composed of 176 sound groups,

[Equation 1] More demanded.

At this time, the recording area of the second track is shown in FIG.
As shown in, the user TOC is written (that is, the start address is "005A" cluster, "1"
D ”sector,“ 08 ”sound group, end address“ 00FE ”cluster,“ 0C ”sector,
If it is the “02” sound group), the system controller 11 adds the address obtained from the equation (1) to the start address as shown in the following equation.

[Equation 2]

By the way, since the address for one sector is assigned only from "0" to "1F", the address of the sector obtained by the equation (2) is rounded up, and the address corresponding to the key release of the fast-forward key 13A is It becomes a "008B" cluster, a "0A" sector, and a "0B" sound group, and the CP causes the optical pickup 4 to access this address to restart the reproduction.

Since the address of the sound group is also restricted to 11 sound groups in 2 sectors, a carry will occur even if this restriction is exceeded.

Similarly, when the fast-reverse key 13B is pressed, the address at which the reproduction should be restarted from the display time counted down independently of the reproduction data when the key-pressing operation of the fast-reverse key 13B is completed. , And the reproduction of data is restarted from this address.

According to the above configuration, in the disk reproducing apparatus which is highly dependent on the program and has a heavy burden on the CPU, such as access to the magneto-optical disk in which data is recorded discontinuously and read control of the data stored in the RAM. The time display during fast-forward playback or fast-reverse playback raises or lowers the time display during fast-forward or fast-reverse independently of the address of the playback data, and at the time of returning to the playback mode, finds the address on the disk corresponding to the time display. By restarting the reproduction from the obtained address, the load required for the system controller 9 can be further reduced as compared with the conventional case. This can reduce the scale of the control program,
The cost of the entire device can be reduced.

(3) Other Embodiments In the above-described embodiment, the count-up or count-down of the display time in the fast-forward mode or the fast-reverse mode is about 10 times faster than that in the normal reproduction mode. Although the case of counting down is described, the present invention is not limited to this, and the display time may be increased or decreased by another magnification, and the count-up or the countdown speed of the display time may be increased according to the operation of the operation key. It may be variable.

Further, in the above-mentioned embodiment, when the system controller 9 calculates the address corresponding to the display time when returning to the reproduction mode, the present invention is not limited to this. A correspondence table may be provided and the address of the optical disk 3 or the like may be obtained based on the table.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the disk reproducing apparatus having the configuration shown in FIG. 1 has been described, but the present invention is not limited to this, and the recording or reproducing of data by the magnetic field modulation method is performed. It can be widely applied to any recording / reproducing device.

Further, in the above-mentioned embodiments, the case where the optical disk is used as the recording medium has been described, but the present invention is not limited to this and can be widely applied to other recording media such as a magneto-optical disk.

[0057]

As described above, according to the present invention, the time information generated by the display time generating means is reproduced while the first or second operation portion for instructing the fast forward or fast reverse is pressed. When the time is displayed and the first or second operation unit is released, the system control is performed by restarting the reproduction of the recorded data from the position corresponding to the display time that the display time generating means has generated until immediately before. It is possible to further reduce the burden on the system control means, which requires a great deal of load, as compared with the prior art.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus according to the present invention.

FIG. 2 is a schematic diagram showing a memory map of data recorded in a random access memory.

FIG. 3 is a state transition diagram of modes according to the present invention.

FIG. 4 is a flowchart for explaining the processing procedure.

FIG. 5 is a schematic diagram for explaining a reproducing operation.

FIG. 6 is a schematic diagram showing an example of management data recorded in a user TOC table.

FIG. 7 is a schematic diagram showing a data structure of a cluster.

FIG. 8 is a schematic diagram showing a data structure of a sector.

[Explanation of symbols]

1 ... Disk playback device, 2 ... Spindle motor, 3
...... Optical disk, 4 ... Optical pickup, 7 ... Decoder, 8 ... Random access memory control circuit, 9 ... System controller, 10 ... Random access memory, 11 ... Data expansion circuit, 13 ... Operation keys , 14
…… Display.

Claims (1)

[Claims] 1. A disc reproducing apparatus for outputting the record data continuously in a time series by writing the record data read from the optical disc in a predetermined unit into a storage means, accumulating the same, and sequentially reading the accumulated record data. A first operation section for instructing fast-forward reproduction, a second operation section for instructing fast-reverse reproduction, and a display time generation means for generating time information according to the operation of the first or second operation section. When the first or second operation section is released, the generation of the time information by the display time generating means is stopped, and at this time, the recorded data is recorded from the position corresponding to the time displayed by the display time generating means. And a control unit for resuming reproduction.