JP2688060B2 - File storage system of image signal with audio signal and reproducing apparatus thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a file storage system for image signals, and more specifically to a file storage system for storing, for example, an image signal representing a still image in a file together with an audio signal, and a reproducing apparatus thereof.

BACKGROUND ART For example, there is a system in which an image signal representing a still image is stored in a file storage device such as a magnetic disk or an optical disk in the form of digital data together with an audio signal associated therewith. From such a file store,
It is possible to select desired images sequentially or randomly and play them with audio.

The audio signal stored in the file storage along with the image signal generally represents the audio of the scene sound, commentary, background music, etc., associated with the image, and its length or amount of data is generally not constant. On the other hand, the image signal represents, for example, one field or one frame, and its data amount is peculiar to the system.

Therefore, in the conventional method of storing the image signal together with the audio signal in a file, as illustrated in FIG.
For example, the fixed-length image data Vn and the indefinite-length audio data An for the nth (natural number) one frame image are serially stored in the form of a data block. In the figure, the track number of the file storage device is taken in the horizontal direction and the sector number is taken in the vertical direction. Usually, in a disk-shaped storage medium such as a magnetic disk or an optical disk, a plurality of concentric tracks are formed as shown in FIG. 4, and the start point and the end point of the track take a reference position and a plurality of sectors are provided between them. Has been formed. As shown in FIG. 5, the concentric track and its sector are assigned track numbers in the direction from left to right according to the step direction of the track, and track numbers in the direction from top to bottom. The sector number is written according to the scanning direction.

A playback device that reads out an image signal and an audio signal from the file storage device and plays back the audio signal on a monitor device, for example, is provided with a buffer memory that temporarily holds the image signal and the audio signal read out from the file storage device. The buffer memory performs a speed conversion function to compensate for the difference in signal speed between the file storage device and the monitor device. A reproducing device for reproducing an image signal together with an audio signal from a file storage device stored by the above-described conventional storage system must use a storage element having a large capacity for this buffer memory. This is because the conventional storage method serially stores fixed-length image data and indefinite-length audio data as a set of data blocks.

More specifically, as shown in FIG. 10, a pair of buffers is prepared for each of the image signal and the audio signal in the reproducing apparatus, and a plurality of images are displayed by alternately using the pair of buffers. It can be played back one after another along with the sound. For example, the image signal data Vn of the nth frame is read from the disk and temporarily stored in the image buffer ^# 1, and when that is finished, the audio signal data An of the frame is read from the disk and the audio buffer is read.
Store in ^# 1. In the figure, a horizontally long rectangular frame indicates a data transfer period.

When these storages are completed, the image signal Vn and the audio signal An are read from the image buffer ^# 1 and the audio buffer ^# 1, respectively, and reproduced on the monitor device.
The audio signal has a length peculiar to the audio data, and is reproduced by the monitor device for the length of the length. During this time, the image signal is repeatedly read out by reading the same frame or field from the image signal buffer. This is shown in the figure by repeating short vertical lines. During this time, the next frame ^# n is stored in the image buffer ^# 2 and the audio buffer ^# 2.
For +1, the image signal data Vn + 1 and the audio signal data An + 1 are read from the disc and stored, and are prepared for the next reproduction.

In such a conventional reproducing apparatus, both the image buffer and the audio buffer require a storage capacity capable of storing the amount of data for one frame. In other words, the audio buffer is also required to have a storage capacity enough to temporarily store all audio signals relating to a specific image of one frame. Therefore,
As the buffer memory, a large capacity memory, for example
Had to have an IC memory.

It is not preferable that the length of the audio signal is limited. That is, it is not preferable that the length of reproducible audio is limited by the storage capacity of the audio buffer provided in the reproduction device. To remove this restriction, for audio signal data that exceeds the capacity of the audio buffer, the content of the audio buffer is updated with the audio signal newly read from the disk when the audio is played back, and a fairly complicated transfer control is performed. Would have to do.

Aim The present invention solves the above-mentioned drawbacks of the conventional technique, and the capacity of the buffer memory of the device for reproducing the image signal together with the audio signal from the file storage device is minimized and the data transfer control thereof is simplified. A method and a reproducing apparatus thereof are provided.

DISCLOSURE OF THE INVENTION According to the present invention, in a file storage system of an image signal with an audio signal, wherein an image signal representing images of a plurality of successive frames is stored in a file storage medium together with an associated audio signal, the file storage medium stores The area is divided into a plurality of storage units, and the file storage system divides image signal data representing an image of one frame into data amounts corresponding to a first predetermined number of storage units, The audio signal data related to the frame immediately before is divided into data amounts corresponding to a second predetermined number of storage units,
Image signal data having a data amount corresponding to a first predetermined number of storage units is stored in a file storage medium, and subsequently, audio signal data having a data amount corresponding to a second predetermined number of storage units is filed. It is stored in a storage medium and this storage operation is
Repeated until the image signal data of one frame is stored in the file storage medium, after the image signal data of one frame is stored in the file storage medium, the voice to be stored for the frame immediately before the frame of the image signal data. When the signal data remains, the remaining audio signal data is stored in subsequent storage units of the file storage medium.

According to the present invention, in a reproducing device for an image signal with an audio signal, which reproduces the image signal together with the audio signal from a file storage medium in which the image signals representing the images of a plurality of successive frames are stored together with the associated audio signal, In the file storage medium, the storage area is divided into a plurality of storage units, the image signal data is divided into data amounts corresponding to a first predetermined number of storage units for one frame image, and audio signal data is obtained. Is divided by the data amount corresponding to the second predetermined number of storage units for the frame immediately preceding the frame of the image signal data, and the file storage medium has a data amount corresponding to the image signal data of one frame. About the first
Image signal data of a data amount corresponding to a predetermined number of storage units, and audio signal data of a data amount corresponding to a second predetermined number of storage units subsequent thereto are stored so as to repeat them. The reproducing apparatus includes a reading unit that reads out video and audio signal data from the file storage medium, a first buffer unit that temporarily stores the image signal data read out from the reading unit, and an audio signal that is read out from the reading unit. Second buffer means for temporarily storing data, control means for controlling reading of the first and second buffer means, and image signals and audio signals read from the first and second buffer means. The output means includes an output means, and the read means reads the image signal data from the file storage medium and temporarily stores the image signal data in the first buffer means, and the audio signal data And temporarily stored in the second buffer means reads the control means outputs from the read output means audio signal data in real time from the second buffer means,
At the same time, the image signal data of the frame immediately before the frame of the image signal data being read from the file storage medium, which is already accumulated in the first buffer unit, is repeated from the first buffer unit in real time. The data amount corresponding to the image signal data of one frame read out from the file storage medium and output from the file storage medium to the first buffer means is exceeded, and the remaining one frame before the frame of the image signal data remains. When the audio signal data is stored in the subsequent successive storage units of the file storage medium, the reading means reads the remaining audio signal data from the file storage medium and temporarily stores it in the second buffer means, The control means reads the remaining audio signal data from the second buffer means in real time and outputs it from the output means.

Description of Embodiments An embodiment of a file storage system for image signals with audio signals according to the present invention will be described in detail with reference to the accompanying drawings.

As described above, the audio signal stored in the file storage together with the image signal is generally a background sound or commentary sound related to the image, and the amount of data is not constant. Therefore, in order to store the audio signal in the file storage medium, a method of which the length is not limited is advantageous.
On the other hand, if the image signal is a still image, it is limited to that which represents an image unit such as one field or one frame, and the data amount thereof is constant. Therefore, in the storage system of the present embodiment, as shown in FIG. 6, variable length audio signal data is inserted in sector units between fixed length image signal data and stored in the far storage device.

In the example shown in the figure, the disk storage medium 10
Each track 12 has four storage units, namely sectors 14V, 14
A and 14A1. These sectors 14V, 14A
And 14A1 are physically the same. Image signal data is stored in four consecutive 14V sectors, followed by one sector 1
Storing the audio signal data to 4A, in this example it is (n is a natural number) the n-th one in the frame ^{# n} repeatedly for the data amount D1 corresponding to the image signal data Vn of. In the figure, portions not hatched are sectors 14V for storing image signal data Vn of the n-th one frame ^{# n,} hatched portions (n-1) th frame ^#
The sector 14A stores n-1 audio signal data An-1.

When there is audio signal data having a length exceeding the data amount D1 corresponding to the image signal data Vn of one frame stored in this way, the audio signal data is transferred to the subsequent necessary number of sectors 14A1. Store. by this,
There the frame ^{# n} image signal data Vn and indefinite length of the audio signal data An-1 associated with the frame ^{# n-1} of the immediately preceding fixed length of
Are efficiently stored in the file storage medium 10 such as a magnetic disk or an optical disk. In this embodiment, 4
The reason why the audio signal data of one sector is stored for each image signal data of the sector will be described in detail later.

An example of an apparatus that realizes such a storage system will be described with reference to FIGS. 1 and 2. FIG. 1 shows a system for recording an image signal and an audio signal related thereto on a disk storage medium 10, and FIG. 2 reproduces the image signal thus recorded together with the audio signal from the disk storage medium 10. The system is shown.

The apparatus has a disk storage device 20, by which image signal data is stored in the disk storage medium 10 together with audio signal data. The disk storage medium 10 may be, for example, a magnetic disk or an optical disk. Disk storage medium
In this embodiment, each track 12 is formed of four sectors 14V, 14A and 14A1 in this embodiment for convenience of explanation.

This device has signal input terminals 22 and 24, and has a function of receiving an image signal at the signal input terminal 22 and receiving an audio signal at the signal input terminal 24 and storing them in the disk storage medium 10 by the disk device 20. . To the signal input terminal 22, for example, a composite video signal representing a still image of one frame is input from the video signal source in the form of an analog signal. Signal input terminal 24
An audio signal related to the image signal input to the terminal 22, for example, a signal representing the audio of the scene sound, commentary, background music, etc. of the image is input from the audio signal source in the form of an analog signal.

The image signal input terminal 22 is connected to an analog / digital converter (ADCV) 26 for image signals. The converter 26 is
This is a signal conversion circuit that converts the analog signal of the input 22 into corresponding digital signal data in response to the sampling clock fsV1 generated by the clock / address generator 28 and outputs it to the output 30V1. The output 30V1 is connected to the image signal buffer memory 32V1.

In the present embodiment, the image signal buffer memory 32V1 is a RAM having a storage capacity for temporarily storing at least one frame of image signal data, and for example, an IC memory is advantageously applied. Actually, it has a pair of storage surfaces as described later, and each has a capacity capable of accumulating one frame of image signal data. The write address and command are input to the control line 36V1 from the clock address generator 28, and the read address and command are input to the control line 38V1 from the control unit 34 of the disk device 20.

Similarly, the audio signal input terminal 24 is an analog
A digital converter (ADCA) 40 is connected. Similar to the analog / digital converter 28, the converter 40 responds to the sampling clock fsA generated by the clock / address generator 42 to convert the analog signal of the input 24 into corresponding digital signal data and outputs 30A1 thereof. Is a signal conversion circuit for outputting to. The output 30A1 is connected to the audio signal buffer memory 32A1.

The audio signal buffer memory 32A1 is a RAM that temporarily stores audio signal data in the present embodiment, and for example, an IC memory is advantageously applied. The write address and command are sent from clock address generator 42 to control line 36A1,
The read address and command are input from the control unit 34 of the disk device 20 to the control line 38V1. Advantageously, the storage capacity of the buffer memory 32A1 corresponds to at least the data amount of two sectors of the disk storage medium 10, as described later.

Both buffer memories 32V1 and 32A1 advantageously comprise two memory areas 100 and 102, as shown in FIG. The buffer memory 32 shown in the figure can be applied to any of the buffer memories 32V1 and 32A1 shown in FIG. 1, and therefore the reference numerals V1 and A1 are omitted.

The data input 30 of the buffer memory 32 is connected to the data inputs 106 and 108 of the pair of memory areas 100 and 102, respectively, via switch 104 as shown. The data outputs 110 and 112, respectively, of both memory areas 100 and 102 are also coupled to the buffer memory 32 via switch 114.
Connected to the output 44 of. Both switches 104 and 114
Is a switching circuit that selectively takes the connection state shown in the figure and the connection state opposite to the figure as shown by the dotted line 116 in synchronization with each other. The write address / command line 36 is
One of the two switches 118 and 120 is connected to the corresponding memory area 100 and 102, respectively. Similarly, the read address / command line 38 is connected to the switch 118.
And 120 from the other side to corresponding memory areas 100 and 102, respectively. Like the switches 104 and 114, both switches 118 and 120 are switching circuits that selectively take the connection state shown in the figure and the connection state opposite to the figure, as shown by the dotted line 122, in synchronization with each other. These switches are the controller 34, as well as the clock and address generator.
Controlled by 68 and 74.

Returning to FIG. 1, the clock address generator 28 converts the analog-to-digital converter 26 at the television signal rate.
Supply sampling clock fsV1 to the buffer memory
The 32V1 is a circuit which gives an address and a command for writing. Similarly, the clock / address generator 42 supplies the sampling clock fsA to the analog / digital converter 40 at the audio signal rate, and the buffer memory 32A
1 is a circuit which gives an address and a command for the writing.

Buffer memory 32V1 and 32A1 data read output 44
V1 and 44A1 are connected to the data input 48 of the disk device 20 via the switch 46 as shown. The read address / command lines 38V1 and 38A1 of the buffer memories 32V1 and 32A1 are connected to the address / command output lines of the control unit 34 of the disk device 20 via the switch 50 as shown in the figure.
Connected to 52. Both switches 46 and 50 are shown in dotted line 54
As shown in, a switching circuit that selectively takes the connection state shown in the figure and the connection state opposite to that shown in the figure under the control of the control unit in synchronization.

By the way, in general, in order to reproduce sound without interruption, the signal transmission rate TRA as digital data depends on the coding method of the sound signal data, but is, for example, about 60 to 20.
It requires about 0KBS (Kbytes / second). In the data storage system of this embodiment, the signal transmission speed TRV at the time of reproducing the image signal is required to be higher than the audio signal transmission speed TRA. Furthermore, the data transfer rate TRD when reading the data of these image signals and audio signals from the disk device 20 is required to be much higher than these.

Therefore, in view of such a condition, in the present embodiment, for the purpose of explanation, the disk storage device 20 is of a constant rotation type having a data transmission rate TRD of image and audio signals of 400 KBS. Also, when reproducing audio, the transmission rate TRA of the audio signal is selected to be 80 KBS. Also disk storage medium
The storage capacity of 10 audio signal data is not limited. Furthermore, two consecutive image frames can be sequentially "joined and reproduced". Therefore, the image signal data is taken into the buffer as quickly as possible. Under such a requirement, in the present embodiment, the disk storage medium
Audio signal data is stored in the next 1 sector 14A each time image signal data is stored in 4 consecutive sectors 14V on 10 tracks, and the audio signal data storage capacity corresponding to 1 frame
Audio signal data exceeding D1 is stored in the subsequent sector 14A1.

By the way, the read data output 56 from the disk device 20
Is connected to the input 30V2 of the image signal buffer memory 32V2 and the input 30A2 of the audio signal buffer memory 32A2 via the switch 58 as shown in FIG. Further, the buffer memory 32V2 from the control unit 34 of the disk device 20 and
The write address and command output 60 to the 32A2 are sent to the write address and command input 36V2 of the image signal buffer memory 32V2 and the write address and command input 36A2 of the audio signal buffer memory 32A2 via the switch 62 as shown in the figure. It is connected. Both switches 58 and 62 are switching circuits that selectively take the connection state shown in the figure and the connection state opposite to the figure in synchronization under the control of the control section 34, as shown by the dotted line 64.

The image signal buffer memory 32V2 may have the configuration shown in FIG. The read address and command are supplied from clock address generator 68 to control line 38V2,
The read data output 44V2 is a digital
It is connected to the input of the analog converter (DACV) 70. The converter 70 is a signal conversion circuit which responds to the sampling clock fsV generated by the clock / address generator 68 to convert the digital signal data of the input 44V2 into a corresponding analog signal and output it to the output 72 thereof. The output 72 serves as an output mark of the present device, to which a video signal input of, for example, a monitor device is connected.

Similarly, the audio signal buffer memory 32A2 may have the structure shown in FIG. 3, and its read address and command are supplied from the clock / address generator 74 to the control line 38A2. The read data output 44A2 is connected to the input of a digital-analog converter (DACA) 776 for audio signals. The converter 76 receives an input 44A2 in response to the sampling clock fsA generated by the clock / address generator 74.
Is a signal conversion circuit for converting the digital signal data of 1 to a corresponding analog signal and outputting the analog signal to the device output 78. The device output 72 is connected to, for example, the audio signal input of the monitor device described above.

The clock address generator 68 supplies the sampling clock fsV to the digital-analog converter 70 at the television signal rate, that is, the real time, and the buffer memory 32V is supplied.
2 is a circuit which gives an address and a command for reading. Similarly, the clock / address generator 74 is a circuit which supplies the sampling clock fsA to the digital / analog converter 74 at the audio signal rate, that is, the real time, and gives the address and command for reading the buffer memory 32A2. This sampling clock fsA may have the same signal speed as that generated by the clock address generator 42.

The operation will be described. Frame in the signal input terminal 22, for example, an image signal Vn of one frame ^{# n} is input, this and the signal input terminal 24 simultaneously associated with the frame ^{# n-2} two frames before the frame ^{# n} The audio signal An-2 is input.
Image signal Vn for one frame input to the signal input terminal 22
Are converted into corresponding image signal data by the analog / digital converter 26. At this time, the switch 104 of the buffer memory 32V1 is controlled so as to connect the data input 30V1 to one memory area, for example, 100. Therefore, the image signal data Vn of one frame is temporarily stored in the memory area 100.

Next, the switch 104 of the buffer memory 32V1 controls to connect the data input 30V1 to the other memory area 102, and the switch 114 controls one memory area 100 to the data output 44.
Control to connect to V1. The signal input terminal 22 is input the image signal Vn + 1 of the next frame ^{# n} + 1, the same 24 audio signal An-1 of the frame ^{# n-1} and the two frames before the frame ^{# n} are input. Therefore, the frame input to the signal input terminal 22
The image signal Vn + 1 for one frame of ^# n + 1 is temporarily stored in the memory area 102 in the same manner as described above.

Along with this, the audio signal An-1 related to the (n-1) th frame ^# n-1 supplied to the input terminal 24 is
The digital converter 40 converts the corresponding audio signal data and transfers it to the buffer memory 32A1. Buffer memory
The switch 104 of 32A1 is 1 sector 1 of the disk storage medium 10.
The connection state is controlled to be inverted every time the data amount corresponding to the storage capacity of 4A or 14A1 is received. Therefore, the audio data input from the output 30A1 of the converter 40 is stored in the memory area of the buffer memory 23A1 in this data unit.
It is temporarily accumulated in 100 and 102 alternately. This data transfer is performed at 80 KBS in this example.

In synchronization with the rotation of the disk storage medium 10, the control unit 34 of the disk device 20 first connects the switches 46 and 50 to the illustrated state for a period corresponding to the four sectors. The read address and command are then output 52, which are provided to buffer memory 32V1. This is read from the memory area 100 of the buffer memory 32V1 the image signal data is output 44V1, is stored in the first four sectors 14V as part of the image signal data Vn of the frame ^{# n.} This data transfer is 400 KBS in this example.

When this storage is completed, the control unit 34 sets the switches 46 and 50 to the state opposite to the connected state shown in the figure for a period corresponding to one sector. The switch 114 of the buffer memory 32A1 is kept on one side, for example, in the connection state shown in the figure, for a period corresponding to one sector. The read address and command are then output at output 52, which are provided to buffer memory 32A1. As a result, in this example, one sector of audio signal data is read from the memory area 102 of the buffer memory 32A1 to the output 44A1. This audio signal data is the audio signal data An that is two frames before the frame ^# n + 1.
It is a part of -1 and is stored in one sector 14A following the first four sectors 14V. This data transfer is also performed at 400KBS.

This operation is repeated until one frame of image signal data Vn is stored in the area D1 of the disk storage medium 10. More specifically, the memory area 10 of the buffer memory 32V1
0 is read out image signal data Vn of the frame ^{# n} are accumulated in the region D1 of the disk storage medium 10 from which the combined, alternating buffer memory 32A1 memory area 100 and 1
The audio signal data An-1 of the frame ^# n-1 is read from 02 and accumulated in the area D1 of the disk storage medium 10 (sixth).
See figure). The buffer memory 32A1 has a function of converting the data transfer rate.

By the way, when the audio data An-1 of the frame ^# n-1 exceeds this data amount D1, the area D1 of the disk storage medium 10
After the end of the storage up to, the control unit 34 sets the switches 46 and 50 to the connection state opposite to that shown in the drawing. This connection status is input 24
It is held until the audio signal An-1 of the frame ^# n-1 input to the terminal is finished. Also, switch 11 of buffer memory 32A1
Similarly to the switch 104, the switch 4 is switched alternately every sector period. As a result, the subsequent portion of the audio signal data An-1 of the frame ^# n-1 is the sector 14 of the disk storage medium 10.
Recorded in A1. Thus, as shown in FIG.
Region of ^{# n} image signal data Vn is a disk storage medium 10 together with the audio signal data An-1 of the immediately preceding frame ^{# n-1 and} the
Memorized in D2. Meanwhile, the image signal data Vn + 1 for one frame of the frame ^# n + 1 is stored in the other memory area 102 of the buffer memory 32V1. The subsequent frames ^# n + 1 and the like are similarly stored in the disk storage medium 10.

Sequential reproduction of each frame from the disk storage medium 10 is performed as follows. Basically, as shown in FIG. 7, there frame, for example, audio An of ^{# n} when played through the buffer memory 32A2 is earlier one of the memory areas of the buffer memory 32V2, for example, 100 previously read image signal data Vn of the frame ^{# n.} Audio is also read from the disk storage medium 10 via the buffer memory 32A2, and a monitor device connected to the device terminals 72 and 74 is provided with one memory area 100 of the buffer memory 32V2.
Simultaneously reproduced together with the image signal data Vn of the frame ^{# n} from. That is, the sound is reproduced substantially in real time, and the speed conversion between reading from the disk device 20 and reproduction to the monitor device is merely performed by the buffer memory 32A2. Meanwhile, the other memory area 10 of the buffer memory 32V2
In 2, the image signal data Vn + 1 of the next frame ^# n + 1 is read from the disk storage medium 10.

More specifically, as shown microscopically in FIG. 8, the disk device 20 includes the image signal data Vn + 1 of a frame of the disk storage medium 10, for example, the (n + 1) th frame ^# n + 1.
When the stored area D1 is accessed, one frame of image signal data Vn + 1 is output to the data output 56. At this time, the control unit 34 first connects the switches 58 and 62 to the illustrated state in synchronization with the rotation of the disk storage medium 10 for a period corresponding to the four sectors. The switches 104, 118 and 120 of the buffer memory 32V2 are kept on one side, for example, in the connected state shown in the figure, for a period corresponding to the first five sectors. Next, the write address of the buffer memory 32V2 and the command are output from the output 60, which are provided to the buffer memory 32V2. As a result, a part of the image signal data Vn + 1 read from the first four sectors 14V of the area D1 of the disk storage medium 10 is stored in one memory area 100 of the buffer memory 32V2. This data transfer is 400 KBS in this example.

When this storage is completed, the control unit 34 sets the switches 58 and 62 in a state opposite to the connection state shown in the figure for a period corresponding to one sector. Further, the switches 104, 118 and 120 of the buffer memory 32A2 are kept on one side, for example, in the connection state shown in the figure, for a period corresponding to 5 sectors. Here, for convenience of explanation, the other memory area 102 of the buffer memory 32V2 already assumed that the image signal data Vn of the frame ^{# n} is written. The write address and command are then output 60, which are provided to buffer memory 32A2. This allows disk storage media
In this example, a part of the audio signal data An read from the next one sector 14A following the first four sectors 14V of the ten areas D1 is stored in the memory area 100 of the buffer memory 32A2 in this example. This audio signal data An is the current image signal data Vn
It is responsible for the voice of the frame ^# n of the immediately preceding frame ^# n + 1 +1. This data transfer is 400 KBS in this example.

Thus, as shown in FIG. 8, this operation is repeated until one frame of image signal data Vn + 1 is read from the area D1 of the disk storage medium 10 and stored in one memory area 100 of the buffer memory 32V2. More specifically,
The image signal data Vn + 1 is accumulated in the memory area 100 of the buffer memory 32V2. Meanwhile, buffer memory 32A2
The switches 104, 114, 118, and 120 alternately take the connection state shown in the figure and the connection state opposite thereto in a cycle of 5 sector periods. The control unit 34 of the disk device 20 gives a write command to the buffer memories 32V2 and 32A2, and the clock address generators 68 and 74 give a read command and an address to the buffer memories 32V2 and 32A2.

Therefore, the audio signal data An is alternately stored in the memory areas 100 and 102 of the buffer memory 32A2, and the memory areas 102 and 100 in which the writing is not performed are performed.
The audio signal data An is read from. The write command and address given from the clock address generator 74 to the buffer memory 32A2 are shown in FIG. 8 (A).
As shown in (B) and (B), after the writing to the memory area 100 or 102 is completed, it is given after the elapse of two sector periods T1 in this embodiment. Therefore, paying attention to one memory area, for example, 100, a part of the audio signal data An accumulated in one sector period is read out at the audio signal rate, that is, 80 KBS in this example, after the lapse of two sector periods T1 after the writing is completed. Be done. The audio signal data of the data amount of 1 sector is
In this embodiment, at this transmission rate, data is read in 5 sector periods. The read audio signal data An is
Is converted into an analog signal corresponding by-analog converter 76, it is outputted to the device output 78, the image on the monitor device ^# n
Is played as the sound of. Meanwhile, the other memory area,
In this example, the audio signal data following this is written in 102.

The two-sector period T1 is taken between the end of writing and the start of reading of the memory areas 100 and 102 of the audio buffer memory 32A2 because the data reading from the disk device 20 generally takes time due to the occurrence of dropout or the like. This is because there are factors that are unstable in terms of time, and we allow for that time margin. Of course, the period length is not limited to this.

On the other hand, the image signal data Vn + 1 read from the disk device 20 is sequentially stored in one memory area 100 of the buffer memory 32V2 in units of 4 sectors as shown in FIG. 8C, and one frame is accumulated. To be done. For convenience of explanation, already assumed that the image signal data Vn of the frame ^{# n} is written in the other memory area 102 of the buffer memory 32V2. Buffer memory 32V2 switch 104,11
8, 120 and 114 are connected as shown. When a read command and an address are given from the clock / address generator 68, one frame of image signal data Vn stored in the other memory area 102 is output 44V2.
Are repeatedly read at the television signal rate (8th
(See FIG. (D)). It also is converted into an analog signal corresponding with the digital-to-analog converter 70, is outputted to the device output 72, it is reproduced as an image ^{# n} on the monitor device. During this period, the image signal data Vn + 1 of the next frame ^# n + 1 is written in the one memory area 100.

When the image signal data Vn + 1 for one frame is stored in the one memory area 100 of the buffer memory 32V2, the disk device 20 determines that the audio signal data exceeding the storage capacity D1 for one frame is written in the sector 14A1. Enters its read operation. The controller 34 includes switches 58 and 62.
Is connected to the connection state opposite to the illustrated state. Further, the switches 104, 114, 118 and 120 of the buffer memory 32A2 alternately take two connection states every 5 sector periods as before. Therefore, the remaining portion of the audio signal data An stored in the sector 14A1 of the disk storage medium 10 has a unit of data amount of 1 sector with a period of 5 sectors as shown in FIGS. 8 (A) and 8 (B). Are alternately written to the memory areas 100 and 102 of the buffer memory 32A2 at 400KBS,
At the same time, the memory areas 102 and 100 are alternately read and reproduced at 80 KBS. This audio signal data An for the frame ^{# n} is performed as long as it is stored in the area D2 of the disk storage medium 10.

Thus, reproduction of the image signal data Vn and the audio signal data An coma ^{# n} is performed. During this period, the next frame ^# n + 1 accumulated in the memory area 102 of the buffer memory 32V2
The image signal data Vn + 1 of ^No. 2 is reproduced together with the image signal data Vn + 2 of the next frame ^# n + 2 and the audio signal data An + 1 of that frame ^# n + 1 from the disk storage medium 10 in the same manner as described above.

As described above, according to the present invention, the storage system is used in which the image signal data representing a frame image is stored in the file storage device together with the audio signal data related to the frame immediately before the frame image. The audio signal data is stored in the skipped sectors between the sectors of the image signal data, and the audio signal data exceeding the data amount corresponding to the image signal data of one unit of the image is stored in the succeeding sectors. To do. Therefore, in a reproducing device that reproduces the image signal together with the audio signal from the file storage device, the audio signal is reproduced substantially in real time,
The buffer memory has only to have a capacity necessary for converting the signal speed. Therefore, the capacity of the audio signal buffer is minimized and its data transfer control is also simplified.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of a file storage system for realizing a file storage system for image signals with audio signals according to the present invention, and FIG. 2 is recorded by the device shown in FIG. FIG. 3 is a functional block diagram showing an embodiment of a reproducing device for reproducing an image signal together with an audio signal, FIG. 3 is a functional block diagram showing a configuration example of a buffer memory in the embodiment shown in FIGS. FIG. 4 is a plan view showing an example of concentric tracks of a disk-shaped storage medium, FIG. 5 is an explanatory view showing a notation for notifying tracks formed on the disk storage medium and sectors thereof, and FIG. 6 is according to the present invention. An explanatory view showing an example of a file storage system of an image signal with an audio signal, FIG. 7 and FIG. 8 are diagrams for reproducing an image signal stored by the file storage system according to the present invention together with an audio signal. Timing diagrams showing the operation of the embodiment of FIGS. 1 and 2, FIGS. 9 and 10 show an example of a conventional file storage system, and explanatory diagrams similar to FIGS. 7 and 8, respectively. It is a timing diagram. Explanation of symbols for main parts 10 …… Disk storage medium 20 …… Disk device 28,74 …… Clock address generator 32V1 …… Buffer memory 34 …… Control section 46,62 …… Switch

Claims (6)

(57) [Claims] 1. A file storage system for an image signal with an audio signal, wherein image signals representing successive images of a plurality of frames are stored in a file storage medium together with associated audio signals, wherein the file storage medium has a plurality of storage areas. In this method, the image signal data representing an image of one frame is divided into data units corresponding to a first predetermined number of storage units, and the image signal data immediately before the frame of the image signal data is divided. Sound signal data associated with the frames is divided into data amounts corresponding to a second predetermined number of storage units, and image signal data having a data amount corresponding to the first predetermined number of storage units is stored in the file. The audio signal data of a data amount corresponding to the second predetermined number of storage units is stored in the file storage medium, and this storage operation is stored in the one frame. This is repeated until the image signal data is stored in the file storage medium, and after the image signal data of the one frame is stored in the file storage medium, the voice to be stored for the frame immediately before the frame of the image signal data. When the signal data remains,
A file storage system for an image signal with an audio signal, characterized in that the remaining audio signal data is stored in subsequent storage units of the file storage medium. 2. The method according to claim 1, wherein the first and second predetermined numbers are such that the ratio of the former to the latter is relative to the data transmission rate when reproducing the audio signal data as audio. A file storage system characterized in that it is set to be substantially equal to a ratio of transfer rates of image and audio signal data read from the file storage medium. 3. The method according to claim 1, wherein the file storage medium is a disk storage medium,
A file storage system, wherein the storage unit is a sector forming a track of the disk storage medium. 4. A reproducing apparatus for an image signal with an audio signal, which reproduces the image signal together with the audio signal from a file storage medium in which image signals representing successive images of a plurality of frames are stored together with the audio signal associated therewith, In the file storage medium, a storage area is divided into a plurality of storage units, and the image signal data is divided into data amounts corresponding to a first predetermined number of storage units for one frame image, The signal data is divided by the data amount corresponding to a second predetermined number of storage units for the frame immediately preceding the frame of the image signal data, and the file storage medium stores the image signal of the one frame. Regarding the data amount corresponding to the data, the image signal data having the data amount corresponding to the first predetermined number of storage units, and the second predetermined number of storage units subsequent thereto. Audio signal data of a corresponding data amount is stored so as to be repeated as a unit, and the apparatus includes a reading unit that reads the video and audio signal data from the file storage medium, and an image read from the reading unit. First buffer means for temporarily accumulating signal data, second buffer means for temporarily accumulating audio signal data read from the reading means, and control means for controlling reading of the first and second buffer means And an output means for outputting the image signal and the audio signal read from the first and second buffer means, wherein the reading means reads the image signal data from the file storage medium and outputs the first buffer. Means for temporarily accumulating, reading the audio signal data and temporarily accumulating in a second buffer means, The audio signal data is read from the buffer means in real time and output from the output means, and at the same time, one of the frames of the image signal data which is already stored in the first buffer means and is being read from the file storage medium. The image signal data of the immediately preceding frame is repeatedly read from the first buffer means in real time and output from the output means, and the image signal of the one frame read from the file storage medium to the first buffer means. When the remaining audio signal data of the frame immediately preceding the frame of the image signal data exceeding the amount of data corresponding to the data is stored in subsequent storage units of the file storage medium, the reading is performed. Means reads the remaining audio signal data from the file storage medium and temporarily stores it in the second buffer means, and the control means controls the second buffer means. Reproducing apparatus of the audio signal with the image signal, characterized in that reading the audio signal data 該残Ri in real time from the stage output from said output means. 5. The apparatus according to claim 4, wherein the first and second buffer means each have a pair of storage areas, and the pair of storage areas are selectively read out and output. Selecting means connected to the means, the selecting means alternately using one of the pair of storage areas for writing from the file storage medium and the other for reading to the output means. A reproducing apparatus controlled by the reader and control means. 6. The apparatus according to claim 4, wherein the file storage medium is a disk storage medium,
A reproducing apparatus, wherein the storage unit is a sector forming a track of the disk storage medium.