JPH10341414A - Video signal reproducing device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video signal reproducing device with excellent response of transition from a high-speed reproduction mode to the continuous frame reproduction mode of a normal reproduction mode or the like. SOLUTION: This video signal reproducing device 1 is provided with a frame memory 6 to be a storage means for storing the plural frame images of video signals and an internal controller 7 for controlling the write to the frame memory 6 of the video signals and controlling the read of the video signals written in the frame memory 6. By the internal controller 7, at the time of the high- speed reproduction mode, the plural frame images composed of the frame image to be reproduced and the front and back frame images continued to the frame image are written to the frame memory 6 and the read of a part of the stored frame images is controlled. At the time of the continuous frame reproduction mode, the frame image continued to the frame image read last is read.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal reproducing apparatus and method for reproducing a video signal, and more particularly, to a video signal reproducing apparatus for reproducing a video signal in various reproduction modes such as a normal reproduction mode, a shuttle mode and a jog mode. Apparatus and method.

[0002]

2. Description of the Related Art A video signal reproducing apparatus for reproducing a video / audio signal reads out a video / audio signal recorded on a recording medium, performs a reproducing process, and outputs the read signal. The video signal reproducing apparatus outputs, for example, a compression-encoded video / audio signal by performing a decoding process or the like.

Some video signal reproducing apparatuses have functions of various reproduction modes such as a normal reproduction mode, a jog reproduction mode, and a shuttle reproduction mode. The shuttle reproduction mode is often in a so-called high-speed reproduction state in which the video signal is reproduced by thinning out the frames. The jog reproduction mode and the normal reproduction mode are generally modes for reproducing a video signal as it is, that is, modes for reproducing continuous frames.

[0004] A video signal reproducing apparatus writes and reproduces a frame image obtained by decoding a compressed image data recorded in a disk recording apparatus by a decoder in a frame memory, for example. For example, when reproducing the compressed image data recorded on the disk recording device, the video signal reproducing device first transfers the compressed image data from the disk recording device and temporarily stores the data in the buffer memory.

In the buffer memory, compressed image data is read out by thinning out frames according to the reading speed. The compressed image data read from the buffer memory is decoded by a decoder and output as a video signal.
Here, the video signal is output as it is from the decoder, or is temporarily stored in the frame memory as described above, and is sequentially read out and output.

When the video signal reproducing apparatus executes the shuttle reproduction mode, it outputs an intermittent frame image which is a frame-thinned video signal stored in a frame memory.

[0007]

By the way, for example, when the shuttle playback mode is switched from the shuttle playback mode in the high-speed playback mode to the jog playback mode, at that moment, the frames before and after the frame image output last in the shuttle playback mode are stored in the frame memory. Do not enter jog playback mode immediately because there are no images. Therefore, the compressed image data of the frame image before or after the frame image last output from the buffer memory to the frame memory is transferred from the buffer memory to the frame memory, and the transferred compressed image data is output from the frame memory. Then, after the so-called cue-up (cue-up), it is possible to shift to the jog playback mode.

[0008] Therefore, in order to shift from the shuttle reproduction mode to the jog reproduction mode, it is necessary to temporarily cue up, so that the responsiveness from the shuttle reproduction mode to the jog reproduction mode is remarkably deteriorated. For example, not limited to this, the responsiveness is also deteriorated in the transition from the shuttle reproduction mode to the normal reproduction mode, and in the transition from the shuttle reproduction mode to the variable speed reproduction mode.

The present invention has been made in view of the above circumstances, and has a responsiveness in shifting from a high-speed playback mode such as a shuttle playback mode to a continuous frame playback mode such as a jog playback mode and a normal playback mode. It is an object of the present invention to provide a video signal reproducing apparatus and a video signal reproducing method which have good performance.

[0010]

In order to solve the above-mentioned problems, a video signal reproducing apparatus according to the present invention is provided at an output stage of a reproduction processing section for reproducing a video signal read from a video signal recording medium. Storage means for storing a plurality of frame images of a reproduced video signal, and writing for controlling the writing of the reproduced video signal to the storage means and reading and controlling the video signal written to the storage means; Read control means for controlling, in the high-speed reproduction mode, write control of a plurality of frame images consisting of a frame image to be reproduced and frame images before and after the frame image to be reproduced in the storage means, in the high-speed reproduction mode. Reads a part of the stored frame image and controls it. Controlling reading out frame images continuous in-time image.

[0011] The video signal reproducing apparatus according to the present invention comprises:
In order to solve the above-mentioned problem, the image processing apparatus is provided at an output stage of a reproduction processing unit that reproduces a video signal read from a video signal recording medium, and stores a plurality of frame images of the reproduced video signal in a storage unit. A storage step of writing and controlling a plurality of frame images composed of a frame image to be reproduced in the high-speed reproduction mode and a frame image immediately before and after the frame image to be reproduced in the storage means, and reading and controlling a part of the stored frame images; And a read / write control step of reading and controlling a frame image continuous with the last read frame image during continuous frame reproduction.

[0012]

Embodiments of the present invention will be described in detail with reference to the drawings. This embodiment is a video signal reproducing device provided with a disk recording device for recording compressed image data of a video signal.

As shown in FIG. 1, the video signal reproduction processing system comprises a buffer memory 4 for reproducing a video signal read from a disk recording device 2 as a video signal recording medium and a decoder 5 for reproducing the video signal. A frame memory 6 provided at an output stage of the unit and serving as storage means for storing a plurality of frame images of the reproduced video signal; and writing and controlling the reproduced video signal to the frame memory 6; An internal controller 7 having a read / write / read control function of reading and controlling a video signal written in the frame memory 6 is provided.

An external controller 8 for transmitting control information and the like to the internal controller 7 is connected to the video signal reproduction processing system 3.

The video signal reproduction processing system 3 constructed as described above
In the high-speed playback mode such as the shuttle playback mode, the internal controller 7 controls the frame memory 6 to write a plurality of frame images including a frame image to be played back and frame images before and after the frame image to be played back, and A part of the stored frame image is read and controlled, and in a continuous frame reproduction mode such as a normal reproduction mode or a jog reproduction mode, a frame image continuous with the last read frame image is read and controlled.

Each part of the video signal reproducing apparatus 1 will be described in detail. The disk recording device 2 has a so-called RAI
D, which is a large-capacity recording medium having a plurality of hard disks. On each hard disk of the disk recording device 2, for example, a video signal compressed and encoded by the MPEG2 system is recorded as compressed image data. Also,
The disk recording device 2 reads the compressed image data by changing the reading speed in accordance with the reproducing speed.

The compressed image signal data read from the disk recording device 2 is stored in a buffer memory 4 of the video signal processing system 3.
Is input to The compressed image data is stored in the disk recording device 2
From the buffer memory 4 via, for example, SCSI.

The buffer memory 4 is a memory for temporarily storing the input compressed image data, and serves to supplement the access time to the disk recording device 2 such as a SCSI scheduling cycle. The buffer memory 4 is set to have a sufficiently large storage capacity such that necessary data can be transferred to the decoder 5 and the like without any waiting time in various speed reproduction.

The decoder 5 has, for example, an image decoding memory, decodes the compressed image data using the image decoding memory, and outputs it as a normal video signal. The video signal output from the data coder 5 is input to the frame memory 6.

The frame memory 6, as shown in FIG.
Storage areas FM ₀ , FM ₁ , FM ₂ , FM ₃ ,..., FM
_N-2 and FM _N-1 . The frame memory 6 has storage areas FM ₀ , FM ₁ , FM ₂ , FM ₃ ,..., FM _N−2 , FM
_The frame image output from the decoder 5 is stored for each of the _N-1 units in units of the frame image. Frame memory 6
Is controlled by a memory control signal.

The storage capacity of the frame memory 6 is as follows:
In various variable-speed reproduction, the setting is made so that the access time required for reading out the compressed image data from the buffer memory 4 and decoding and outputting the data in the decoder 5 is compensated. By setting in this way, it is possible to output data required for the device connected to the video signal output terminal, which is the final output stage, without waiting time.

The external controller 8 externally controls the video signal processing system 3 to set, for example, various variable speed reproduction modes and reproduction speeds. The external controller 8 is connected by, for example, an RS-422A interface.

The internal controller 7 performs transfer control for transferring necessary compressed image data from the disk recording device 2 to the buffer memory 4 when necessary based on information on various variable speed reproduction modes and reproduction speeds sent from the external controller 8. Also, transfer control for transferring data from the buffer memory 4 to the frame memory 6 through the decoder 5 and read control of a video signal from the frame memory 6 are performed.

The video signal recording / reproducing apparatus 2 having the above-described configuration is used in a high-speed reproduction mode, for example, a shuttle reproduction mode in a high-speed reproduction state (hereinafter, the shuttle reproduction mode in the high-speed reproduction state is simply referred to as a shuttle reproduction mode) and a normal reproduction mode. 3 and FIG. 4 will be described with reference to flowcharts shown in FIGS.

In the shuttle reproduction mode, the video signal is decimated and reproduced, that is, the intermittent frame image is reproduced. In the normal reproduction mode, the video signal is reproduced as it is, that is, the continuous frame image is reproduced. Reproduction.

The number of frames (M) that can be stored in the buffer memory 4 is 30 frames, and the number of frames (N) that can be stored in the frame memory 6 is 6 frames. Then, read access to the disk recording device 2 is performed once a second, and 30
The compressed image data of the frame is read at one time. here,
The read time of 30 frames to the buffer memory 4 is M
Frame time (1 second).

First, the video signal reproducing apparatus 1 first executes step S1
As shown in (1), an execution instruction of the shuttle reproduction mode or the normal reproduction mode is received from the external controller 8.

As shown in step S2, the internal controller 7 determines whether the execution command is a normal reproduction mode or a shuttle reproduction mode. Here, if the mode is the shuttle reproduction mode, the process proceeds to step S3, and if the mode is the normal reproduction mode, the process proceeds to step S7.

The case of proceeding to step S3 and executing the shuttle reproduction mode will be described. In step S3,
As shown in FIGS. 5 (a) and 5 (b), the internal controller 7 outputs one time every M frame times from the disk recording device 2.
The compressed image data of the intermittent frame and the compressed image data of the preceding and succeeding frames continuous with the intermittent frame are written in the buffer memory 4 in accordance with the read speed.

That is, N / M frames of compressed image data are selected as intermittent frames to be selected by skipping several frames in accordance with the readout speed performed once every M frame times, and the (N-M) frames before and after each frame. 1) Write the compressed image data of a total of M frames composed of the compressed image data of one frame to the buffer memory 4.

It is assumed that the data read head of the disk recording device 2 can read data at five locations within M frame times by jump seek.

As a result, a total of 30 frames, including 5 intermittent frames and 5 frames before and after each intermittent frame, are written in the buffer memory 4 as compressed image data.

Next, the internal controller 7 proceeds to step S4
As shown in FIG. 5C, the decoder 5 decodes the compressed image data of a total of N frames, that is, the first frame output in this shuttle playback mode and (N-1) consecutive frames before and after the first frame. Frame memory 6 after decoding
Write to. The frame image to be output in the shuttle playback mode is written to a specific address near the center of the address of the frame memory 6.

More specifically, a frame image to be output as an image (eg, frame image n + 2 in FIG. 5C) and five consecutive frame images before and after the frame image (frame images n, n + 1, and n + 1 in FIG. 5C). .. N + (N-1)), a total of six frame images are written into the frame memory 6,
At this time, the frame image n + 2 is written near the center of the address of the frame memory 6.

The time required to start writing a frame image in the frame memory 6 is, as shown in FIG. 5C, the time required for writing compressed image data for M frames from the disk recording device 2 to the buffer memory 4. Is completed, and is a time T _R from when the data is written to the frame memory 6.

After writing, the internal controller 7
Part of the frame image written in the frame memory 6, in this case, the frame image to be output written at a specific address near the center of the address of the frame memory 6, is repeatedly output for N frame times as shown in step S5. Specifically, the frame image n + 2 stored near the center of the address of the frame memory 6 is repeatedly output as shown in FIG.

On the other hand, the internal controller 7 generates the compressed image data of the next intermittent frame and the frame following the intermittent frame (the image compressed data n + i,
n + i + 1, n + i + 2,..., n + i + (N−
1)) is decoded from the buffer memory 4 to the frame buffer 6 by the decoder 4 and transferred. For example, as shown in FIG. 5D, it is possible to repeatedly output the frame image n + i + 2 of the frame images transferred to the frame memory 6 after repeatedly outputting the frame image n + 2 for N frame times as shown in FIG. it can. In this manner, shuttle reproduction is executed by repeatedly outputting frame images one after another for N frame times.

The process of repeatedly outputting frame images one after another for N frames in step S5 in the shuttle reproduction mode is performed until a stop instruction of the shuttle reproduction mode is confirmed, as shown in step S6. When confirming the stop instruction of the shuttle reproduction mode, the internal controller 7 repeatedly outputs the last frame image output from the frame memory 6, as shown in step S11 of FIG. The repetitive output of the frame image in step S11 is performed until the execution instruction of the normal reproduction mode is confirmed as shown in step S12, or until the execution instruction of the shuttle reproduction mode is confirmed as shown in step S13.

When the execution command of the normal reproduction mode is confirmed in step S11, the internal controller 7
The process proceeds to step S9 executed in the normal reproduction mode shown in FIG.

This normal reproduction mode is a reproduction mode determined and executed in step S2. The normal reproduction mode will be described.

When the internal controller 7 confirms the execution command of the normal reproduction mode in step S2, the operation proceeds to step S7. In step S7, the internal controller 7
As shown in FIGS. 6A and 6B, the disk recording device 2 writes the compressed image data of M frames into the buffer memory 4 once every M frame time. Specifically, the compressed image data of 30 frames is written in the buffer memory 4.

Next, the internal controller 7 proceeds to step S8.
At this time, as shown in FIG.
, N + n frames of compressed image data (image compressed data n, n + 1, n + 2,..., N +
After decoding (N-1)), the data is written to the frame memory 6.

After writing, the internal controller 7
As shown in step S9, the frame memory 6 outputs one frame at a time. For example, as shown in FIG. 6 (d), the output is started from the frame image n + k by the reproduction control signal after a time T _up after reading from the disk recording device 2. When the number of remaining frame images output from the frame memory 6 becomes small, the internal controller 7 sequentially replenishes the compressed image data of the frame images from the buffer memory 4.

The internal controller 7 includes a frame memory 6
, And the successive replenishment of the frame images to the frame memory 6 accompanying the image output is performed until the stop command of the normal reproduction mode is confirmed in step S10.

Incidentally, step S in the normal reproduction mode.
The output processing of the frame image in 9 is the first processing to be performed by shifting to the normal reproduction mode when the shuttle reproduction mode is switched to the normal reproduction mode.

That is, as described above, the frame image to be output written at a specific address near the center of the address of the frame memory 6 is repeatedly output for N frame times (step S11), and the stop instruction of the shuttle reproduction mode is confirmed. After that, the frame image output from the frame memory 6 is repeatedly output (steps S10 and S11), and an execution instruction in the normal reproduction mode is confirmed (step S). This is the first processing of the mode.

As described above, by shifting from the shuttle reproduction mode to the normal reproduction mode, in the shuttle reproduction mode, a frame image continuous with the last output frame image is always written in the frame memory 6. Even if the process shifts to, the continuous frame image written in the frame memory 6 is output instantaneously without writing a new frame image for the normal reproduction mode to the frame memory 6 in the frame memory 6. Can be.

That is, since the compressed image data of the frame images before and after the last output frame image is transferred from the buffer memory 4 to the frame memory 6, so-called cue-up is not required, N frames to the frame memory 6 are stored. The transition to the normal reproduction mode is accelerated by the replenishment time of the minute data.

It should be noted that, even if an instruction to execute the normal reproduction mode is issued while the shuttle reproduction mode is being executed, the shuttle reproduction mode can be instantaneously shifted to the shuttle reproduction mode. That is, from the process of repeatedly outputting the frame image to be output in step S5 of the shuttle reproduction mode, the execution instruction of the normal reproduction mode is
It is possible to shift to step S9 of the normal reproduction mode,
In this case, output of a frame image that is continuous with the frame image output in the shuttle playback mode is started.

The internal controller 7 determines whether or not the stop command for the normal reproduction mode executed as described above is determined in step S10.
When it is confirmed that the stop command has been issued, in step S11, the frame memory 6
Repeatedly output the frame image output from. Then, in steps S12 and S13, the internal controller 7 determines whether the instruction is the execution instruction of the normal reproduction mode or the execution instruction of the shuttle reproduction mode.
Returning to rt, the shuttle reproduction mode is executed, and in the case of the normal reproduction mode, the processing shifts to the processing of step S10 in the normal reproduction mode.

The video signal reproducing apparatus 1 can instantaneously shift from the shuttle reproduction mode to the normal reproduction mode according to the above-described flowchart.

Accordingly, the responsiveness of the video signal reproducing device 1 when shifting from the shuttle reproduction mode to the normal reproduction mode is improved.

The number of frames that can be stored in the buffer memory 4 and the number of frames that the frame memory 6 can store,
Further, the access time is not limited to the above numerical values.

Here, a conventional shuttle reproduction mode will be described. In the conventional shuttle playback mode, as shown in FIGS. 7A and 7B, only the intermittent frames are written to the buffer memory 4 once every M frame time from the disk recording device 2 according to the read speed. (Processing corresponding to step S3). It is assumed that the data read head of the disk recording device 2 reads data of, for example, five intermittent memories within M frame times by jump seek.

Then, the intermittent frames n, n + i, n + 2i, n + 3i, n + 4i are decoded from the buffer memory 4 and written into the frame memory 6 (corresponding to step S4). After writing the frame images, each frame image is sequentially output within M frame times. For example, image frames n, n + i, n + 2i, n + 3i, n
+ 4i are output one after another for 10 frame times.

Therefore, in the conventional shuttle playback mode, when the mode is shifted to the normal playback mode, at that moment, there is no frame image before and after the last output frame image in the frame memory 6, so that a new disc recording is performed. It is necessary to read out a necessary frame image from the device 2,
That is, it is necessary to perform cue-up, and a transition time is required for that time.

Therefore, even if the video signal reproducing apparatus 1 according to the embodiment of the present invention shifts from the shuttle reproduction mode to the normal reproduction mode, the transition time can be shortened because cue-up is not required.

The video signal reproducing apparatus 1 can also instantaneously execute various continuous frame reproducing modes such as a jog reproducing mode and a variable speed reproducing mode after shifting from the shuttle reproducing mode, as described above.

Further, two decoders 5 are mounted in parallel,
By doubling the storage capacity of the frame memory 6, the transfer speed can be doubled, and the update of the frame image in the shuttle playback mode can be doubled.

Then, the decoder 5 converts the compressed image data into 2
Decoding at double speed and writing to the frame memory 6 at double speed also makes it possible to double the update rate.

Further, the video signal reproducing apparatus 1 according to the present invention
Can instantaneously shift from the shuttle playback mode to the normal playback mode even for an uncompressed video signal recorded on the disk recording device 2. In this case, the uncompressed video signal read from the disk recording device 2 is appropriately reproduced, then written to the frame memory 6, and then output.

[0062]

The video signal reproducing apparatus according to the present invention is provided at an output stage of a reproduction processing section for reproducing a video signal read from a video signal recording medium, and comprises a plurality of frame images of the reproduced video signal. And a write / read control unit that controls writing of the reproduced video signal to the storage unit and controls reading and reading of the video signal written in the storage unit. In the high-speed playback mode, the plurality of frame images including the frame image to be played back and the frame images before and after the frame image to be played back are written and controlled in the storage unit, and a part of the stored frame image is read and controlled. In the continuous frame playback mode, control to read the frame image that is continuous with the last read frame image In Rukoto, it is possible to perform jog playback mode from the high-speed reproduction mode by the shuttle reproduction mode or the like, a normal transition to continuous frames playback mode such as play mode instantly.

Therefore, the video signal reproducing apparatus can improve the responsiveness of transition from the high-speed reproduction mode such as the shuttle reproduction mode to the continuous frame reproduction mode such as the jog reproduction mode and the normal reproduction mode.

Also, the video signal reproducing method according to the present invention
A storage step that is provided at an output stage of a playback processing unit that plays back a video signal read from a video signal recording medium and stores a plurality of frame images of the playback-processed video signal in a storage unit; A frame image to be reproduced and a plurality of frame images consisting of frame images before and after the frame image to be reproduced are controlled to be written in the storage means, and a part of the stored frame image is read and controlled. A writing / reading control step of reading and controlling a frame image that is continuous with the read frame image allows instantaneous transition from a high-speed playback mode such as a shuttle playback mode to a continuous frame playback mode such as a jog playback mode and a normal playback mode. Can be done.

Therefore, the video signal reproducing method can improve the responsiveness of transition from the high-speed reproducing mode such as the shuttle reproducing mode to the continuous frame reproducing mode such as the jog reproducing mode and the normal reproducing mode.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a video signal reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a frame memory included in the video signal reproducing device.

FIG. 3 is a first half of a flowchart showing processing when the video signal reproducing apparatus shifts from a shuttle reproduction mode to a normal reproduction mode.

FIG. 4 is a second half flow chart showing processing when the video signal reproducing apparatus shifts from a shuttle reproduction mode to a normal reproduction mode.

FIG. 5 is a diagram illustrating a process until the video signal reproducing device outputs a frame image in a shuttle reproducing mode.

FIG. 6 is a diagram showing a process until the video signal reproducing device outputs a frame image in a normal reproduction mode.

FIG. 7 is a diagram showing a state in which a conventional playback apparatus outputs a frame image in a shuttle playback mode.

[Explanation of symbols]

1 video signal reproducing device, 2 disk recording device, 4 buffer memory, 5 decoder, 6 frame memory, 7
Internal controller

Claims (4)

[Claims] 1. A storage means provided at an output stage of a reproduction processing unit for reproducing a video signal read from a video signal recording medium and storing a plurality of frame images of the reproduced video signal; Writing and reading control means for writing and controlling the written video signal to the storage means, and reading and controlling the video signal written to the storage means, wherein the writing and reading control means And controlling the writing of the plurality of frame images including the frame image to be reproduced and the frame image before and after the frame image to be reproduced to the storage unit,
A video signal reproducing apparatus, comprising: reading and controlling a part of a stored frame image; and reading and controlling a frame image that is continuous with the last read frame image in a continuous frame reproduction mode. 2. The video signal recording medium records the video signal composed of the compression-encoded frame image, and the reproduction processing unit has a larger storage capacity than the storage means and reads the video signal from the video signal recording medium. 2. The image processing apparatus according to claim 1, further comprising: a buffer memory for temporarily storing the compression-encoded frame image; and decoding means for decoding the compression-encoded frame image read from the buffer memory. Video signal playback device. 3. The read / write control means reads and controls a frame image near the center of the time axis between the preceding and following frame images written in the storage means in the high-speed playback mode. The video signal reproducing device according to claim 1, wherein: 4. A storage step provided at an output stage of a reproduction processing unit for reproducing a video signal read from a video signal recording medium and storing a plurality of frame images of the reproduced video signal in a storage unit; In the high-speed playback mode, the plurality of frame images including the frame image to be played back and the frame images before and after the frame image to be played back are written and controlled in the storage unit, and a part of the stored frame image is read and controlled. And a control step of reading and controlling a frame image that is continuous with the last read frame image in the continuous frame reproduction mode.