JP2000011520A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously execute a recording and a reproducing apparently by hardly increasing circuit systems by using the memory control circuit provided with two independent control pointers and recording and reproducing in sides of recording and reproducing media at high speeds while keeping continuity of data being in a memory. SOLUTION: When data of a disk are successively written in a pointer (1) and the pointer (1) reaches the maximum value, this device is shifted to a disk changing operation. After storage positions are determined with address information, a memory control part 110 reads out the data from the memory with the pointer (1) to record them on an exchanged disk. Enen in this period, the data are continued to be outputted to a data reproducing circuit 45 with a pointer (2). The control part 110 becomes a waiting time before the recording of the data is completed and the pointer (2) reaches the final point and in this state, a new disk reproduced and the pointer (1) advances to start an increment and the operation of the pointer (2) is not changed in a range in which the pointer (1) does not catch up with the pointer (2).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plurality of recording media,
The present invention relates to a so-called changer device for recording and reproducing data by sharing one mechanism.

[0002]

2. Description of the Related Art A conventional changer type MD (mini-disc) system is disclosed in Japanese Patent Laid-Open No. 6-103699.
Japanese Unexamined Patent Publication (Kokai) No. H10-264, pp. 157-334 is known. FIG. 6 is a schematic block diagram of a conventional mini disk system. In FIG. 6, reference numeral 201 denotes a disk serving as a recording / reproducing medium; 202, a reproduction signal processing circuit; 203, a memory for temporarily storing reproduced data; 204, a decompression circuit for decompressing compressed data; Digital-to-analog converter for converting to signals, 21
0 is an analog / digital converter for digitizing an analog audio signal, 209 a compression circuit for compressing information of digitized data to reduce the amount of data,
Reference numeral 208 denotes a memory for temporarily storing print data, reference numeral 207 denotes a print signal processing circuit, reference numeral 206 denotes a servo circuit for moving a print medium at a predetermined speed, and reference numeral 211 denotes a memory control circuit for managing the storage state of the memory. FIG. 5 is a conceptual diagram illustrating the operation of the memory control circuit.

The operation of the conventional recording / reproducing apparatus configured as described above will be described. The signal reproduced from the disk 201 is reproduced as data by the reproduction signal processing circuit 202 and is temporarily written to the memory 203.
Although the details will be described later, the transfer rate of the signal is converted using the memory 203, and the memory control circuit 211 instructs the compression / decompression circuit 204 to output the reproduced signal. In the case of the MD, the compression / decompression circuit 204 reproduces the audio signal by performing the decompression process because the MD is recorded by a compression method called ATRAC. The data thus restored is converted into an analog audio signal by the D / A converter 205 and output.

At the time of recording, an analog audio signal is converted into digital data by an A / D converter 210, and the signal is converted into a data string based on the ATRAC standard by a compression circuit 209. This compression process is a process introduced to extend the recording time that can be recorded on one disc,
Since the transfer rate of data to be recorded / reproduced by this compression processing is smaller than the transfer rate of the signal subjected to A / D / D / A, when transferring at the same rate, a waiting time is required to reduce the transfer rate. Need to convert. This rate conversion processing is performed by the memory control circuit 21 as described later.
1 is controlled. The output of the compression circuit 209 is temporarily stored in the memory 2
08, and output to the recording signal processing circuit 7 according to the instruction of the memory control circuit 211. The memory control circuit 211 issues a command to the servo circuit 206 in accordance with the reading from the memory, and controls the data to be written at a correct position based on the address information previously written on the disk. In the operation of the servo circuit 206, the same address control processing is performed at the time of reproduction.

The operation of the memory control circuit 211 will be described with reference to FIG. When the writing to the memory 203 is started at the point (a), the usage of the memory rapidly increases. Next, reading from the memory 203 is started at a point (b). In the case of the MD system, the transfer rate of the data reproduced from the disc is set faster than the rate of the signal reproduced as an audio signal. Go. Before the capacity of the memory 203 overflows, the writing to the memory 203 is temporarily stopped at a point (c).
In this case, since only reading is performed, the usage of the memory 203 gradually decreases. After a while, writing to the memory 203 is restarted at the point (d). In this way, by repeating the operations (c) and (d), the transfer rate conversion processing is executed while reading is continued.

Point (g) represents a case where the reproduction signal from the disc is interrupted for some reason and a state where writing cannot be performed for a while continues, and all the contents of the memory are read. If writing can be started before at point (h), the reproducing operation can be continued without interrupting the reading side. After storing data in the memory up to the point (i), the operation is performed in the same manner as in the steps (d) and (e). In the MD system in which the reproduction rate is converted by using the memory in this way, by increasing the capacity of the memory 203, it is possible to change the disk as one of the states where the case of the point (g) has continued for a long time. By utilizing this fact, information can be continuously recorded on a plurality of disks without interruption.

In general, the memory 203 and the memory 2
08 uses a configuration in which the same memory is switched between recording and reproduction. Therefore, the role of the storage element is to store the signal from the reproduction signal processing circuit 202 at the time of reproduction and to output the signal to the restoration circuit 204, and to store the signal from the compression circuit 209 at the time of recording. 203 is to be output.

[0008]

In this recording / reproducing apparatus, recording and reproduction are performed as independent operations. Therefore, in order to perform recording and reproduction at the same time, it is necessary to prepare two similar circuits. is there. The present invention takes advantage of the characteristic that recording and reproduction on a recording medium can be performed at a higher speed than the transfer rate of a compressed audio signal, so that recording and reproduction can be performed at the same time apparently with almost no increase in circuit system. An object of the present invention is to provide a recording and reproducing device.

[0009]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention uses a memory control circuit having two independent control pointers so that the recording / reproducing media side can be reproduced while the audio side is reproduced. High-speed recording / reproduction on the recording / reproducing media side while preserving the continuity of the data in the memory by enabling the recording operation or the recording / reproducing media side to be the reproducing operation with the audio side being recorded. By letting
It is configured so that recording and reproduction can be performed at the same time apparently.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a recording / reproducing apparatus provided with a changer mechanism for exchanging a plurality of recordable / reproducible recording media, a reproducing circuit for reproducing information recorded on the recording medium, and a method for temporarily reproducing a reproduced signal. , A data reproduction circuit for reading and restoring a reproduction signal stored in the memory, a recording circuit for recording the reproduction signal stored in the memory on a recording medium, and writing and reading from the memory. A memory control unit that controls writing to the memory and reading to the recording circuit with the pointer 1, controls reading to the data reproducing circuit with the pointer 2, and performs continuous control by the data reproducing circuit. It is configured such that recording can be performed by the recording circuit on the recording medium exchanged by the changer mechanism during reproduction.

FIG. 1 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 104 denotes a changer mechanism unit, 101 and 102 denote changeable disks, 105 denotes a control unit for controlling disk exchange, 111 denotes a buffer memory for storing recording / reproduction signals, and 110 denotes reading / writing of the buffer memory. 6 is the same as that of FIG. 6, and the data reproduction circuit 45 includes a compression / decompression circuit 204 and a D / A converter 205.
It is a combination of FIG. 2 is a conceptual diagram showing a memory control method, which is different from FIG. 7 in that an address pointer value of a memory control unit is shown together with remaining amount information.
FIG. 3 is a conceptual diagram for explaining a special case of remaining amount information, which is a portion corresponding to the continuation of FIG. Hereinafter, FIG.
The control method of the pointers 1 and 2 will be described with reference to FIG. Reading and writing of the memory with these pointers can be time-divisionally processed in a very short cycle, so that they seem to be changing at the same time.

First, a portion corresponding to the data area on the disk 100 is initialized and a reproducing operation is started. In the state (A), data read from the disk is sequentially written to the pointer 1 and is written up to the maximum capacity of the memory 111. At this time, by reading data from the buffer memory 111 with the pointer 2 and outputting the data to the data reproduction circuit 45, the reproduction state of the disk can be confirmed. The remaining memory information at this time is pointer 1
And the change speed of the pointer 2 sequentially increases.

Next, when the pointer 1 reaches the maximum value, the state transits to the state (B) and the operation shifts to a disk change operation. During this time, the pointer 1 is stopped, and the pointer 2 is slowly changing in the reproduction state. When the change operation of the disk is completed and the address information is read from the replaced disk to determine the recording location, the memory control unit changes to the state (C), reads the data from the memory with the pointer 1, and An operation of recording data on the replaced disk is performed through the recording circuit 70. During this time, data is continuously output to the data reproducing circuit 45 by the pointer 2. The remaining amount information in the states (B), (C), and (D) decreases only in synchronization with the reading of the pointer 2 because only the reading from the memory is performed. When the data recording is completed, the state transits to the state (D) and the change operation is performed. Also at this time, the data reproduction circuit 45
The data of the pointer 2 continues to be output.

The next state (E) corresponds to a waiting time from the end of the change operation until the pointer 2 reaches the final point. In this state, a new disc is reproduced, and the pointer 1 starts increasing before the pointer 2, and the operation of the pointer 2 does not change even in the case where the pointer 1 cannot catch up with the pointer 2. When the pointer 2 reaches the final point, the state returns to the state (A), and the above operation is repeated.
By these operations, data read from the disk 1 can be recorded on the disk 2 while the audio-based reproduction state is continuous, and it appears that recording and reproduction are performed simultaneously.

FIG. 3 shows a state after the processing of FIG. 2, and illustrates a case where the pointer 1 is about to overtake the pointer 2. The state (A ') occurs after the state (E). The state (A ′) indicates a state where the remaining amount information becomes full because the pointer 1 catches up with the pointer 2 while the signal reproduced from the disk is being written to the memory, and the writing to the memory is stopped. I have.
When the state (A ') occurs, the memory control circuit 110 stops changing the pointer 1, stops writing to the memory, and waits for the reading of the pointer 2 to be completed. During this state (E '), the system control unit 1
20 issues a re-access command to the servo circuit 206,
As soon as it is confirmed that the pointer 2 has read the contents of the memory, the state transits to the state (A ") and waits so that the information from the disk can be read.

When the pointer 2 finishes reading the data up to the last address and detects that the remaining amount information has also been released from the full state, the memory control unit 110 permits the writing to the memory 111 by the pointer 1 and Detecting the previously stopped address, transitions to state (A "), and writes the subsequent data to the memory. When the necessary data has been written to memory 111, memory control unit 110 transitions to state (B). 2, the information can be copied to another disk while the data recorded on the disk 100 is being reproduced by the data reproducing circuit 45. By effectively using the capacity, even if data could not be read due to dirt on the disk, etc. Function of preventing the beauty of it can be realized at the same time.

According to the second embodiment of the present invention, in a so-called changer device which performs recording and reproduction by one recording and reproducing mechanism while exchanging a plurality of recording media with a recordable and reproducible recording medium, reproduction is performed from the recording medium. A memory for storing signals, a data reproducing circuit for reading and reproducing from the memory with the pointer 1, and a recording circuit for reading and rewriting to the recording medium with the pointer 2; The memory control unit is configured so that the content of the memory can be rewritten by the recording circuit on a recording medium different from that reproduced. FIG. 4 is a conceptual diagram showing a memory control method in that case, and is different from FIG. 2 in that there is no state (E).
Hereinafter, a control method of the pointers 1 and 2 will be described with reference to FIG.

When FIG. 2 is compared with FIG. 4, the inclination of the pointer 2 changes because there is no state (E). In order to change the inclination of the pointer 2, it is necessary to change the transfer rate of the data output to the data reproducing circuit 45. However, if this is executed as it is, the pitch of the reproduced signal changes, and a sound that is difficult to hear is reproduced. Therefore, by skipping and outputting data while maintaining the transfer rate as it is, it is possible to monitor a high-speed reproduction signal while maintaining the pitch, and this function is realized by the operation of the memory control unit.
Since the compressed audio data is recorded in units of 212 bytes called a sound frame, if the data is thinned out every other data unit and output, for example,
It is possible to reproduce at twice the speed without changing the pitch.

In this state, the operation of the pointer 1 is the same as that of the first embodiment.
Therefore, even when the time in the state (E) in FIG. 2 is long and the operation time and the waiting time are almost equal,
By decimating and changing the pointer 2, the copy can be executed while confirming the data at a high speed. The method of thinning out the data is determined by the data read speed corresponding to the inclination of the pointer 1 and the time required for exchanging the disk and locating the disk.
With this combination, a function of copying data between disks can be realized while monitoring audio data at an assumed speed while preventing sound skipping other than predetermined thinning data. Of course, the data is output to the data reproduction circuit 45 at the normal speed, and the operation of resetting the pointer 2 to the initial value when returning to the state (A) is performed. It is also possible to collectively thin out the data and reproduce the data intermittently. With these functions, it is possible to confirm the outline of the contents while copying the data at a high speed.

According to a third embodiment of the present invention, there is provided a memory for storing a signal reproduced from a recording medium, a data reproducing circuit for reading out and reproducing the pointer with the pointer 1 from the memory,
A recording circuit for reading the data with the pointer 2 and rewriting the data on a recording medium; and a means for changing the contents of the memory. The data is reproduced from the recording medium while being continuously and continuously reproduced from the memory by the data reproducing circuit. The memory control unit is configured to read out control information and the like other than the received signal with another pointer and newly record it on a recording medium.

FIG. 5 is a conceptual diagram showing a method of controlling the memory in that case. Since FIG. 2 is the same as FIG. 2 except that the state (F) is added, the description is omitted. Less than,
The method of controlling the memory will be described with reference to FIG. When FIG. 2 is compared with FIG. 5, the state (F) is added. In this state, the writing of the operation on the disk side is performed. As data used for writing, data obtained by reading a spare area on the memory with a new dedicated pointer 3 or data directly given from the system control unit is used. These data are stored in, for example, TOC (Table
There is table of contents information called “Of Contents”, which is prepared in advance using a memory data change function before writing to the disk, and is read out at the timing of state (F) and written to the disk.

With this function, it is possible to absorb the processing time separately required for writing the control information on the disk by including it in the spare time corresponding to the reproduction waiting time, and to reduce the total processing time. Can be shortened. It should be noted that the timing of this state (F) may be before the state (C), or the processing may be continued normally without passing through the state (F), and the state (F) may be added only when necessary.
There is no need to write extra data to disk each time.

[0023]

As described above, by using the recording / reproducing apparatus of the present invention, it is possible to easily realize a recording / reproducing apparatus capable of recording and reproducing at the same time apparently without adding a circuit. Is extremely useful.

[Brief description of the drawings]

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

FIG. 2 is a conceptual diagram illustrating an operation of a memory control unit of the recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 3 is a conceptual diagram for explaining a special operation of a memory control unit of the recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 4 is a conceptual diagram for explaining an operation of a memory control unit of a recording / reproducing device according to a second embodiment of the present invention.

FIG. 5 is a conceptual diagram illustrating an operation of a memory control unit of a recording / reproducing device according to a third embodiment of the present invention.

FIG. 6 is a block diagram of a conventional recording / reproducing apparatus.

FIG. 7 is a timing chart showing fluctuations in the usage of a buffer memory of a conventional recording / reproducing apparatus.

[Explanation of symbols]

100, 101, 102 ... disk, 202 ... reproduction circuit, 203, 208, 111 ... buffer memory, 205 ... D / A converter, 206 ... servo circuit, 207 ... recording circuit, 204, 209 ...
Compression / decompression circuit, 210 A / D converter, 21
1, 110: memory control circuit; 104: changer device; 105: disk change control unit;
0: System control unit.

Claims (5)

[Claims] 1. A recording / reproducing apparatus having a changer mechanism for exchanging a plurality of recordable / reproducible recording media, comprising: a reproducing circuit for reproducing information recorded on the recording medium; a memory for temporarily storing a reproduced signal; A data reproduction circuit for reading and restoring the reproduction signal stored in the memory, a recording circuit for recording the reproduction signal stored in the memory on a recording medium, and a memory control unit for controlling writing to and reading from the memory The memory control unit controls writing to the memory and reading to the recording circuit with the pointer 1, controls reading to the data reproducing circuit with the pointer 2, and uses the changer mechanism during continuous reproduction by the data reproducing circuit. A recording / reproducing apparatus capable of performing recording by a recording circuit on an exchanged recording medium. 2. The recording / reproducing apparatus according to claim 1, wherein the changing speed of the pointer 1 is higher than the changing speed of the pointer 2. 3. The recording / reproducing apparatus according to claim 1, wherein the memory control unit controls writing to the memory so that the pointer 1 does not exceed the pointer 2 when writing to the memory. 4. The recording / reproducing apparatus according to claim 1, wherein the data reproducing circuit includes a decimating means for decimating and outputting a reproduced output. 5. The recording device according to claim 1, wherein the memory control unit is configured to:
2. The recording / reproducing apparatus according to claim 1, wherein control information other than the signal reproduced from the recording medium is read from the memory by the third pointer and recorded on the recording medium.