JP3591655B2 - Reproduction apparatus and method - Google Patents

Description

[0001]
【table of contents】
The present invention will be described in the following order.
Means for solving the problems to be solved by the conventional technical invention (FIGS. 1 and 2)
Action (FIGS. 1 and 2)
Example (1) Configuration of Example (FIGS. 1 to 3)
(2) Effects of Embodiment (3) Effects of Other Embodiments
[Industrial applications]
The present invention relates to a reproducing apparatus and method, and can be applied to, for example, a disk reproducing apparatus for reproducing recorded information from a disk-shaped recording medium.
[0003]
[Prior art]
2. Description of the Related Art Conventionally, in a disk reproducing apparatus such as a compact disk player, a disk-shaped recording medium is irradiated with a light beam, and recorded information can be reproduced based on the reflected light beam.
In this compact disk player, by processing the reproduction data in real time, the recorded information can be reproduced in accordance with the transmission speed of the output signal.
[0004]
[Problems to be solved by the invention]
However, the compact disc player has a drawback in that, when the reproduction head processes the reproduced data in real time and the optical head tracks and jumps due to external vibration or the like, the sound skips.
[0005]
In this case, it is considered that skipping can be effectively avoided by processing the reproduced data via a large-capacity buffer memory.
That is, in this method, after reproducing data obtained from a recording medium is stored at a high speed in a large-capacity buffer memory, the reproducing data is processed in accordance with the transmission speed of the output signal, and the reproducing data is stored in the buffer memory. At this time, the reproduction data is stored intermittently in the recording order.
In this way, the reproduction data lost by the track jump can be reproduced repeatedly by using the period for completely processing the reproduction data stored in the buffer memory, thereby effectively preventing sound skipping.
[0006]
However, in this method, the reproduced data obtained from the recording medium is output after being delayed by a time determined by the capacity of the buffer memory.
For this reason, there is a problem that it is difficult to easily set an editing point and the like when processing reproduction data via a buffer memory as compared with a case where reproduction data is processed in real time like a compact disc player.
[0007]
That is, in the case of processing reproduction data in real time, for example, when a start ID is provisionally set, it is possible to immediately confirm whether or not the position of the start ID is a desired position by repeating the reproduction operation. Even when the ID is changed, it can be easily changed.
On the other hand, when processing the reproduction data via the buffer memory, it is necessary to process the reproduction data extra by the amount of the buffer memory in order to confirm the start ID. Has the disadvantage that the operation is complicated.
[0008]
The present invention has been made in view of the above points, and it is an object of the present invention to propose a reproducing apparatus that can easily set a start ID and the like even when processing reproduced data via a buffer memory.
[0009]
[Means for Solving the Problems]
In order to solve this problem, according to the present invention, reproduced data is read out from a predetermined recording medium 22 at a high speed and intermittently stored in the buffer memory 6, and the reproduced data stored in the buffer memory 6 is transmitted at a transmission speed lower than the high speed. The playback device 1 that continuously outputs the data in the case where the operation element 16 is operated during the data reproduction, and in response to the operation of the operation element 16, the data near the time when the operation element 16 is operated is used as the data. The data stored in the buffer memory 6 and the neighboring data stored in the buffer memory 6 are cyclically reproduced. If the search marker moving operation is executed during the cyclic reproduction, the position of the search marker M is stored in the buffer memory 6. The data is moved to the buffer memory 6 based on the upper address, and the position of the search marker M having a smaller data amount than the neighboring data is set as a reference. The preceding and following data is read out from the buffer memory 6 in which the neighboring data is stored and reproduced cyclically, and the position of the search marker M determined when the search marker determination operation is executed is stored in the buffer memory 6. After detecting the address data on the recording medium 22 corresponding to the address data, the recording medium 22 is reproduced based on the address data on the recording medium 22.
[0010]
[Action]
After setting a data search marker M on the buffer memory 6 which is intermittently stored on the buffer memory 6 at a high speed and is read continuously at a low speed, the recording medium 22 corresponding to the search marker M is set. By detecting the upper address data, the position of the search marker M can be determined while cyclically reading out the data in the buffer memory 6 while limiting the data in the buffer memory 6 to a narrower range without repeating the reproducing operation of the recording medium 22 each time. By adjusting the range of the data including the edit point gradually by adjusting, the edit point can be easily and reliably determined.
[0011]
【Example】
An embodiment of the present invention will be described below in detail with reference to the drawings.
[0012]
(1) Configuration of the embodiment In FIG. 1, reference numeral 1 denotes a magneto-optical disc device as a whole, which records and reproduces a digital audio signal using a disc-shaped recording medium.
[0013]
That is, in the magneto-optical disc device 1, during recording, give audio signal A _IN to the analog-digital converter (A / D) 2, where after converting into a digital signal, and outputs to the decoder encoder 4.
At the time of recording, the decoder encoder 4 compresses the input digital signal, adds an error correction code or the like, and outputs it in a predetermined format.
[0014]
The buffer memory 6 sequentially takes in the output data of the decoder encoder 4 and, when this output data is accumulated in a predetermined amount or more, outputs this output data at a transmission speed four times as fast as the input data.
Thus, the buffer memory 6 converts the transmission speed and outputs the input data intermittently.
[0015]
If an error such as a track jump occurs during the data output, the buffer memory 6 re-outputs the output data after a lapse of a predetermined period. If the output data cannot be recorded due to an error such as the track jump, the buffer memory 6 outputs the output data. The data can be re-recorded.
[0016]
The data processing circuit 8 performs an interleaving process or the like on the output data of the buffer memory 6, and then adds the address data and outputs the result.
The disk drive circuit 10 drives the magneto-optical disk to rotate at a high speed, and drives a magnetic head for forming a modulation magnetic field in accordance with output data of the data processing circuit 8.
[0017]
Further, the disk drive circuit 10 emits a light beam at a predetermined timing, thereby performing thermomagnetic recording of output data of the data processing circuit 8.
At this time, the disk drive circuit 10 detects an abnormality such as a track jump by monitoring a pre-groove formed on the magneto-optical disk in advance, and outputs the detection result to the system controller 12.
[0018]
As a result, in the system controller 12, when an abnormality such as a track jump occurs, the control data is output to the buffer memory 6 and the data processing circuit 8 to re-output the recording data, whereas the control data is output to the disk drive circuit 10. Output and return from abnormal state.
Thus light in the magnetic disc apparatus 1, even in a place of great vibration, and a stable audio signal A _IN is adapted to be recorded.
[0019]
On the other hand, when it is detected that the key operator (KEY) 16 has been operated through the interface circuit 14, the system controller 12 outputs control data to each circuit block to thereby control the entire operation mode. Switch.
Further, the system controller 12 switches the display of the display device (DSP) 18 via the interface circuit 14, thereby displaying the operation mode, the recording / reproducing time, and the like.
[0020]
Here, in the reproduction mode, the disk drive circuit 10 emits a light beam while reducing the light amount in a state where the magneto-optical disk is rotationally driven in the same manner as during recording, and detects the reflected light beam of the magneto-optical disk.
Further, the disk drive circuit 10 generates reproduced data based on the detection result of the reflected light beam, and stores the reproduced data in the buffer memory 6 via the data processing circuit 8.
[0021]
At this time, the disk drive circuit 10 repeatedly reproduces the same recording track, outputs the reproduced data intermittently while monitoring the data storage amount of the buffer memory 6, and thereby stores the reproduced data in the buffer memory 6 even if the track jump occurs. The necessary reproduction data is repeatedly reproduced using a period until the processing of the reproduction data is completed.
The data processing circuit 8 processes and outputs the reproduced data in a manner opposite to that at the time of reproduction, while the buffer memory 6 reduces the transmission speed of the output data to 1/4 that of the input data. Output.
[0022]
Further, while the buffer memory 6 intermittently takes in input data, it continuously outputs output data, thereby converting the rate of input / output data and outputting it. The decoder encoder 4 processes data at the time of reproduction and at the time of recording, and thereby performs error correction processing and data decompression processing to demodulate a digital audio signal.
[0023]
A digital-to-analog conversion circuit (D / A) 20 converts the output data of the decoder encoder 4 into an analog signal and outputs the signal. In the magneto-optical disk device 1, the magneto-optical disk is reproduced and the audio signal A _OUT is reproduced. It is made to be able to output.
[0024]
At the time of this reproduction, when the key operator 16 is operated to enter the edit mode, the system controller 12 monitors the operation of the subsequent key operator 16, and when the operator of the marker is pressed here, as shown in FIG. Execute the processing procedure.
[0025]
That is, as shown in FIG. 2, the system controller 12 shifts from step SP1 to step SP2, where it outputs a control signal to the disk drive circuit 10 and the data processing circuit 8, and the reproduction at the time when the operator of the marker is pressed. Based on the reproduced data inside (FIG. 3A), the reproduced data in the vicinity thereof is stored in the buffer memory 6 (FIG. 3B).
At this time, address information is assigned to the buffer memory 6 in accordance with the absolute address on the magneto-optical disc. In the magneto-optical disc apparatus 1, reproduction data is designated on the buffer memory 6 and the magneto-optical disc is designated. A corresponding position on the disk can be detected.
[0026]
Subsequently, the system controller 12 proceeds to step SP3, starts outputting the reproduced data stored in the buffer memory 6 to the decoder encoder 4, and then proceeds to step SP4.
Here, the system controller 12 sequentially and cyclically outputs the reproduction data stored in the buffer memory 6 while monitoring the key operator 16, and detects the timing of the pressing operation when the marker setting operator is pressed. To set a marker M (FIG. 3C).
[0027]
That is, the system controller 12 fetches the address data for the reproduction data being reproduced at the time when the marker setting operator is pressed, and thereby sets the marker on the buffer memory 6.
Subsequently, the system controller 12 proceeds to step SP5, where the setting position of the marker is set at the reproduction point P, and then the reproduction data before and after the reproduction point P are sequentially and cyclically output from the buffer memory 6 (FIG. )).
[0028]
When the operator for changing the marker is pressed in this state, the system controller 12 moves the position of the marker M back and forth in response to the operation of the operator.
Further, the system controller 12 proceeds to step SP6 when a predetermined period has elapsed after updating the reproduction point P with updating of the marker.
Here, the system controller 12 determines whether or not the operator for confirming the marker setting has been pressed. If a negative result is obtained here, the process proceeds to step SP7 to update the contents of the buffer memory 6.
In this embodiment, the marker setting position is displayed in the form of a bar graph, so that the marker setting position can be easily confirmed.
[0029]
At this time, the system controller 12 stores the previously reproduced data in the buffer memory 6 so as to partially overlap with the reproduced data previously stored in the buffer memory 6, and then proceeds to step SP4 to execute the processing procedure. repeat.
On the other hand, when the confirmation operation element is pressed, the system controller 12 moves to step SP8 because a positive result is obtained in step SP6, and stores the position of the marker M in the built-in memory circuit. .
[0030]
At this time, the system controller 12 detects the corresponding address data on the magneto-optical disk 22 based on the address data on the buffer memory 6, and stores the address data in the memory circuit as the position of the marker M.
After the marker M is set on the buffer memory 6, the address data on the corresponding magneto-optical disk 22 is detected based on the marker M, so that the marker can be easily read without reproducing the magneto-optical disk 22 each time. Can be set.
[0031]
Thus, in the system controller 12, using this address data as the start ID, it is possible to execute cueing, editing work and the like. When the address data is stored in the memory circuit, the process proceeds to step SP9 and ends the processing procedure. .
[0032]
(2) Effect of Embodiment According to the above configuration, after the marker M is set on the buffer memory 6, the corresponding address data on the magneto-optical disk 22 is detected and the start ID is set, so that the magneto-optical device is set up. The start ID can be changed without reproducing the disk 22, so that even when the reproduction data is processed via the buffer memory 6, the start ID can be easily set.
[0033]
(3) Other Embodiments In the above embodiments, the case where the start ID is recorded in the memory circuit built in the system controller has been described. However, the present invention is not limited to this, and the innermost circumference of the magneto-optical disk is not limited to this. May be recorded in a data recording area for disk management provided in the.
That is, in this type of magneto-optical disc, a user toque area is allocated to this data recording area, and a start ID can be recorded in a reserve area of this user toque area. In this case, the start ID is taken in at the start of reproduction. Thus, it is possible to process reproduction data such as cueing according to the start ID.
Alternatively, the start address and the end address of the user's contact area may be directly updated. In this case, repeat reproduction can be performed using the start address and the end address.
[0034]
Further, in the above-described embodiment, the case where the start ID is set has been described. However, the present invention is not limited to this, and can be widely applied to the case where the reference position of the editing process is set.
[0035]
Furthermore, in the above-described embodiment, the case of reproducing a magneto-optical disk has been described. However, the present invention is not limited to this, and can be widely applied to a reproducing apparatus that reproduces a desired recording medium via a large-capacity buffer memory. Can be.
[0036]
【The invention's effect】
As described above, according to the present invention, a search marker for data which is stored at a high speed, intermittently in a buffer memory, and which is continuously read at a low speed is set on the buffer memory, and then the search marker is set. Address data on the recording medium corresponding to the search marker, the data in the buffer memory is cyclically read out while being limited to a narrower range, without repeating the reproducing operation of the recording medium each time. By gradually limiting the range of the data including the edit point by adjusting the position, the edit point can be easily and reliably determined.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a magneto-optical disc device according to an embodiment of the present invention.
FIG. 2 is a flowchart for explaining the operation.
FIG. 3 is a schematic diagram for explaining the operation.
[Explanation of symbols]
1 ... Magneto-optical disk device, 6 ... Buffer memory, 10 ... Disk drive circuit, 12 ... System controller.

Claims (3)

A reproducing apparatus for reading reproduced data from a predetermined recording medium at a high speed, intermittently storing the reproduced data in a buffer memory, and continuously outputting the reproduced data stored in the buffer memory at a transmission speed lower than the high speed. ,
When an operator is operated during data reproduction, in response to the operation of the operator, data near the time when the operator is operated is stored in the buffer memory, and the nearby data stored in the buffer memory is circulated. If the search marker moving operation is performed during the cyclic playback, the position of the search marker is moved to the buffer memory based on the address in the buffer memory, and the position of the search marker is shifted from the neighboring data. Also, when the data before and after the position of the search marker having a small amount of data as a reference is read out from the buffer memory in which the neighboring data is stored and reproduced cyclically, and the search marker confirmation operation is executed. The address data on the recording medium corresponding to the address data on the buffer memory indicating the determined position of the search marker is stored. After issuing, reproducing apparatus, characterized in that on the basis of the address data on the recording medium for reproducing the recording medium. 2. The reproducing apparatus according to claim 1, wherein the reproducing apparatus moves the position of the search marker based on an operation of an operation element. A first step of temporarily writing intermittently the data read together with the address data from the recording medium on which the address data and data are recorded to a buffer memory;
A second step of reading the data written in the buffer memory at a lower transfer speed than the transfer speed at the time of writing the data;
During the reproduction of the data written in the buffer memory, a search marker for searching the data read from the recording medium is set on the buffer memory in accordance with an operation given from the outside. A third step of storing data near the time when the operation is performed in the buffer memo memo;
The stored data in the vicinity is cyclically reproduced, and when a search marker moving operation is performed during the cyclic reproduction, the position of the search marker is set to the buffer memory based on the address on the buffer memory. Up and down, the data before and after the address data in the buffer memory indicating the position of the search marker having a smaller data amount than the data in the vicinity is referenced from the buffer memory in which the data in the vicinity is stored. A fourth step of reading out and playing back cyclically and setting the position of the search marker determined when the search marker determination operation is executed on the buffer memo memo;
After detecting the address data on the recording medium corresponding to the address data on the buffer memory indicating the position of the search marker determined when the search marker determining operation is executed, the address data on the recording medium is referred to. And a fifth step of reproducing the recording medium.

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