WO1997004598A1 - Device for decoding encoded video signal and storing and decoding device using it - Google Patents

Device for decoding encoded video signal and storing and decoding device using it Download PDF

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Publication number
WO1997004598A1
WO1997004598A1 PCT/JP1995/001454 JP9501454W WO9704598A1 WO 1997004598 A1 WO1997004598 A1 WO 1997004598A1 JP 9501454 W JP9501454 W JP 9501454W WO 9704598 A1 WO9704598 A1 WO 9704598A1
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WO
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Patent type
Prior art keywords
decoding
video signal
image
signal
means
Prior art date
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PCT/JP1995/001454
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French (fr)
Japanese (ja)
Inventor
Hiroki Mizosoe
Masuo Oku
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Hitachi, Ltd.
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146Data rate or code amount at the encoder output
    • H04N19/152Data rate or code amount at the encoder output by measuring the fullness of the transmission buffer
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/78Television signal recording using magnetic recording
    • H04N5/782Television signal recording using magnetic recording on tape
    • H04N5/783Adaptations for reproducing at a rate different from the recording rate
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/84Television signal recording using optical recording
    • H04N5/85Television signal recording using optical recording on discs or drums

Abstract

A device for storing and decoding encoded video signals realizes high-speed reproduction with a requisite minimum circuit provided on the decoding device side without analyzing and reconstructing the codes on the storing device side. The storing and decoding device smoothly decodes not only I pictures, but P pictures also. An IPB identifying section (121) identifies the kind (I, P and B) of a picture and only stores I and P pictures in a buffer memory (122) and discards B pictures. Therefore, the device has a mode where only the I and P pictures are decoded. Data are transferred to a decoding device (1) from an encoded data storing device (2) at a rate which is higher than the average rate in the normal reproduction, thus, realizing high-speed reproduction. When the buffer memory (122) makes an underflow error, it is judged that the data transfer rate is too low and track jump is carried out through a jump control section (23) to ensure the reproduction speed.

Description

Decoding apparatus and use it t Ming fine manual coded video signals were accumulated decoding apparatus art

The present invention, storage device encoded signal, to accumulate decoding apparatus had use decoding apparatus and them. BACKGROUND

Digitized video signal, especially moving images with huge amount of information. Therefore, a very large storage capacity when it when you'll recording intact for a long time on a recording medium such as a magnetic disk is required, costly. Similarly, if you'll directly transmitting digitized video signal even when the transmission by wire or wireless, it requires a very wide band transmission path since bit tray Bok video data is high, its realization is not easy . Therefore efficiently encode the video data by signal processing, the coding scheme to reduce the amount of data has been proposed several.

MP EG 1 as such coding scheme ( "OPTRON ICS";. 1 992, No. 5, p p according to "encoding in the storage medium" of 86 to 98) and MPEG 2 ( "Journal of the Institute of Television Engineers" ;. Vo l 48, refers to both cases was No. l, p p 44~49 are described) (hereinafter simply MP EG and Gentsu)..

The MPEG is an encoding scheme of the coding method and the audio signal of the video signal. Furthermore, there is integration schemes that integrate each and encoded encoding video signals and encoded audio signals in a manner, it'll connexion integrates both can be transmitted and stored at the same time. In MPEG, one method that has been used to reduce the data amount of the video data, converted into smaller information of connexion amplitude preparative difference between the image and the images before and after the image to be encoded (hereinafter reference image) by a method of reducing the number of bits required for coding.

In MPEG, it referred to the unit of an image to be coded and pictures. MPEG

For 1, one picture is composed of one frame of the original image. In the case of MPEG 2 1 picture is composed of one frame or one field unit of the original image, whether used either unit has become possible selected during encoding.

I, P, three kinds of pictures of B exists by reference method for the image. The Re This is shown in the first 4 FIG. Arrows in the figure indicate the start point reference image, the endpoint is the Picture in decoding. I-picture does not perform the reference image. Information needed was decoded is from is encoded to all within the picture (image marks Goka image). Although I picture is capable alone decoding, generally the amount of data it is most. P picture as a reference picture to I pixels Chiya or P-picture has been decoded immediately before (forward predictive picture). The amount of data followed common in the I picture. The B-picture is the immediately preceding and the reference image I or P-picture exists immediately (bidirectional prediction image). The amount of data most fewer.

Next, we describe the hierarchical structure of a code of MPEG video signal. Coded data of the MPEG has a hierarchical structure called a layer. As shown in the first 5 Figure, there are six levels below the uppermost sequence layer to the lowest layer of the block layers.

Uppermost sequence layer starts a sequence header, which is a unit of code that ends with a sequence end code. The sequence header pixels Chiyasaizu, parameters common to the series of sequences, such as the frame rate has been encoded. Note that, as in the case of channel switching, in case of decoding starts in the middle of shea one cans, header is adapted to be inserted repeatedly appropriately in the sequence on the encoding side to the sequence layer. The next group, O blanking picture layer began in the header to the group, O blanking picture includes a plurality of picture layer.

Picture layer begins in the picture header includes a plurality of slice layer. As described above, one picture corresponds to one frame image or a field image. The picture header I, P, etc. parameter indicating the distinction of B is encoded.

Slice layer begins to slice header includes a plurality of macro blocks. Macroblock layer includes a macroblock header, six blocks. Then, DCT (discrete cosine transform) coefficient is encoded in the lowest layer of the block layers.

Incidentally, in the MPEG, the sequence error code indicating that you have included an error in the encoded data is prepared. This insertion due transmission medium is allowed when has failed completely correcting errors occurred during transmission of the encoded data evening, for example. However, not defined for how to deal with the decoding apparatus side when the sequence error first cord has been inserted in the MPEG standard, the usage is found up to the decoder.

In MPEG, provided a buffer memory capacity predetermined inside decoding apparatus, it coding is the responsibility of the encoder side so as not to cause overflow or underflow. To explain this Te C, use an eighth FIG. Figure is a graph illustrating transition of a buffer memory inside the data amount of the decoding device. The horizontal axis represents time and the vertical axis represents the amount of data. Further, in this diagram taken in the case of one picture period = one frame as an example. Is input encoded data of the video signal from the outside, it the amount of data of the internal Ban connexion buffer increases. 1 frame diary once, periodically decoded I spoon (decoding) is performed, data of only the buffer amount consumed at that time is reduced. Since repeating the above transition of the data amount in the buffer becomes sawtooth shape as shown in FIG. Although the actual hardware decoding is performed over a certain time, in this figure represented by the model decoding it is instantaneous. The slope of the graph of the time data increase is represents the transfer rate of data input, which will be described later.

It should be noted that the peak of the data amount or exceeds the capacity of the buffer memory (overflow one flow), opposite the minimum amount of data becomes zero, Isseki de is insufficient (underflow) is it is that is required in the encoding apparatus for encoding as no. Therefore, the encoding apparatus in advance assuming a buffer capacity of the decoding apparatus side, encoding is performed so that it does not overflow one flow or underflow. At the same time, describing the assumed buffer capacity value of the a parameter in the encoded video signal. Thus the decoding apparatus side can be performed by preparing the above-Bas Ffamemori capacity that is at least written, the normal decoding processing without causing underflow or overflow.

Figure 4 is an example of a storage decoder 3 common encoded signal made up of a decoding apparatus 1 and the encoded data storage device 2 of the encoded data. In the coded data storage unit 2, a memory 2 2 When there is a vacancy therein, issues a data request signal to the data reading unit 2 8 requests the encoded data. Data reading portion 2 8 based thereon, reading the evening encoded data from the storage medium 2 1, and outputs to the memory 2 2. The memory 2 2 receives the data request signal from the decoding device 1, and outputs the stored encoded data therein accordingly. In the decoding apparatus 1, to separate the evening encoded data received in the system decoding section 1 1 to the encoded video data and encoded audio data. After separated encoded video data is temporarily stored in the buffer memory unit 1 2, is input to the decoding section 1 3, where they undergo a decoding process is outputted as the decoded video signal. Further, when there is a vacancy inside the path 'Ffamemori unit 1 2 requests the data and outputs the data Tarikuesu Bok signal to the system decoding unit 1 1, the system decoding unit 1 1 encodes the further data request signal in response thereto It is output to the data storage device 2 requests the encoded data.

Figure 6 is a diagram for explaining the transmission rate of the code Cadet Isseki outputted from the encoded data storage device 2. Upon receiving the data request signal from the decoding device 1, and outputs a predetermined amount of coded data in the coded data storage unit 2 is constant data transfer rate (peak value in the figure). Since Detarikue strike is performed intermittently in response to advances 涉 decryption processing, the average value of the transfer rate Bok encoded data as a whole becomes a value smaller than the peak value. Its value is the average of the data transfer rate one Bok during normal playback.

Incidentally, in the reproduction system of such a coded video signal, not only the normal playback, a practical upper Convenient and special playback can be achieved, such as high-speed reproduction. However, it not defined specifically for the method to achieve such a special reproduction in the standard of MPEG.

For example, a video signal originally being normally encoded by assuming the playback, it is possible to perform high-speed reproduction by a child output to the decoding device from thinning partially within the encoded data storage device . As such, after kept the grammatical structure of the code, to realize high-speed reproduction by remake the encoded data on another working apparent from the side of the decoding apparatus is also recommended MPEG. However, in their present form without modifying the video signal itself is coded assuming normal playback, does not refer to schemes for fast play deliberately on the side of the decoding apparatus.

To realize high-speed reproduction, as recommended by the MPEG, the encoded data storage device, remaking the original encoded video signal the grammatical structure of the code to the encoded video signal on the normal alternative apparent Te Moritsu in the method, you do not have to make a hand to decode KaSo 置側. However, since the analyzes coded video signal shall newly provided in a device for reconstructing the encoded data storage device. Thus the circuit scale increases, thereby leading to increase in cost.

For the purposes of high speed reproduction, in order to avoid such an increase in circuit scale, simple apparatus is omitted analysis and reconstruction of the encoded video signal in the coded data storage device is considered. Show it in Figure 5. That is, using the jump controller 2 3, the coded data read from the storage medium 2 1 by controlling the data reading section 2 8 to skip regularly to read, Mayumi a portion of the coded data evening, sent to the decoding apparatus Te is Umono have to realize high-speed reproduction.

The storage medium on 2 1 encoded data along the track 2 1 1 (but not or shown concentric) spiral in a form such as that shown in the first 3 FIGS became are recorded. Data reading section 2 8 is going to usually convex read in the order it from the beginning. The jump controller 2 3 by controlling the data reading section 2 8 so as to 1 or more tracks Jiyan flop it skips encoded data.

However This way, there is a problem that the reproduced image may One Do unnaturally discontinuous image. Is, I, B, the possible decoding three of Picture of P is because only I-pictures because. That is, in order to decode the B-picture and P-picture immediately before the reference image is necessary. Where Ca, encoded data is sent to the decoding apparatus so are discontinuous in places by the track jump, there is a possibility that the reference image necessary for decoding is missing. In other words, it guaranteed I called reference image decoding apparatus holds therein is necessarily suitable reference image. Therefore, B at the time of high speed reproduction, decoding of P picture is not possible, forced decoding only decodable I-picture in alone. Since high-speed itself of it had been reproduced Considering the purpose thinned picture necessary, the reference image is thinned out B pictures can not be decoded with two not considered appropriate, but following the not decrypt even a P picture it may become unnaturally discontinuous reproduced image as.

The state of the image to be reproduced is shown in the first 1 FIG. The horizontal axis is time and the vertical axis represents the image order to be displayed at the time of normal reproduction. FIG (a) for the time of normal reproduction, and indicates that the I, P, a picture of Te to Baie B is displayed. (B), (c), (d) shows the case of the high speed reproducing mode, both large average inclination than (a), the which indicates that the correspondingly high speed reproduction. Among them, high-speed playback of the image by the above-mentioned track jump is stepped graph (b). Only, yet decoded forced at intervals I-picture of the coded data for doing a track jump. Therefore, it is necessary to even repeated the same image (I picture) to repeatedly display as shown in FIG., There is a problem that unnaturally discontinuous image into a connexion put away.

An object of the present invention is to provide a storage decoding device of the coded video signal while avoiding an increase in circuit size due to the provision of an apparatus for analyzing the encoded video signal in the encoded data storage in the device to realize high-speed reproduction It is in.

Further object of the present invention is to realize as much as possible smooth playback image as per the high-speed reproduction connexion first 1 view (c) or (d). Disclosure of the Invention

For the purposes achieved, the storage device encoded signal in the present invention, a signal reading means for reading the encoded video signal from a storage medium storing the encoded video signal,

A first buffer memory for storing temporarily an output of said signal reading means, in response to a signal from the storage device externally forcedly read skip so that the part of the recorded coded video signal in the storage medium and control means for controlling the signal reading means,

The first reads the encoded video signal from the buffer memory, information is the high speed at a value greater than the time average of the data transfer rate is the normal reproduction in a period that is output in the same sequential order as the time records the encoded video signal is to be output to an external.

Further, in the decoding device of the coded video signal,

By analyzing the input the coded video signal, the image prediction method identifying means for identifying the image coding image and the forward predicted picture and a bidirectional predicted picture, temporarily the entered the encoded video signal and a second buffer memory for storing,

Comprising a decoding means for decoding reads the encoded video signal stored in said second buffer memory,

On the basis of the output of the image prediction method identifying means, only the image in the coded image and the forward predicted picture stored in the second buffer memory among the input the encoded video signal, not bidirectional prediction image stored Accordingly, a first decoding mode to the decoding means decodes only the image coded picture and forward prediction image,

On the basis of the output of the image prediction method identification unit, 蓄 example only image coded image to the second buffer memory among the input the encoded video signal, not stored in the forward prediction picture and bidirectionally predictive image it allows the decoding means has a Rukoto provided a second decoding mode for decoding only image coded image. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a block diagram of a storage decoding device of the coded video signal in the first embodiment.

Figure 2 is a Proc view of storage decoding device of the coded video signal in the second embodiment.

Figure 3 is a block diagram of a storage decoder encoded signal in the third embodiment.

Figure 4 is a Proc view of storage decoding apparatus of the general encoded signal.

Figure 5 is a Proc view of storage decoding apparatus of the general encoded signal.

6 is a diagram for explaining a transfer rate one preparative code Cadet Ichita outputted from the encoded data storage device.

7 is a diagram for explaining the transfer rate of the coded data outputted from the encoded data storage device.

8 is a graph showing the transition of the data amount of the buffer memory provided in the decoding apparatus.

9 is a graph showing the transition of the data amount of the buffer memory provided in the decoding apparatus.

First 0 is a graph showing a transition of the data amount of the buffer memory provided in the decoding apparatus.

The first 1 is a diagram showing a state of normal reproduction and high speed reproduction of the image (first 2 is a diagram showing a state of super-high-speed reproduction of the image.

The first FIG. 3 is a schematic diagram of tracks on a storage medium for storing encoded data.

The first 4 is a diagram showing I, P, how to reference B pictures each image in MPEG.

The first 5 is a diagram showing the hierarchical structure of coded video signals of MPEG. BEST MODE FOR CARRYING OUT THE INVENTION

It will be described with reference to the embodiment of the present invention accompanying drawings. In this embodiment, assuming the encoding data evening video signal analogous to MPEG described above as an input signal.

FIG. 1 is a block diagram of a storage decoder 3 encoded signal according to the present invention. 1 decoding device of the coded video signal, 2 is the encoded data storage equipment.

First, it will be described flow of signals in the normal decoding process. In the encoded data storage device 2, the storage medium 2 1 encoded data is recorded that integrates the encoded video signal and the encoded audio signal. De Isseki reader 2 8 reads the recorded encoded data on the storage medium 2 1 in response to a request from the memory 2 2. Memory 2 2 temporarily stores the coded data read, and outputs it in response to a request from the decoding device 1. Also, the memory 2 2 when the free inside occurs, requests data from the data reading unit 2 8 issues a Detari quest signal.

In the decoding device 1, separated from the coded data storage unit 2 up undergo coding de one data, the encoded data to the encoded video data Xi and the encoded audio data in the system decoding unit 1 1. Among the encoded video data is once stored in the buffer memory unit 1 2 internal memory 1 2 2, is input to the decoding unit 1 3.

The decoding section 1 3, first, in the VLD 1 3 1 analyzes the encoded video data, DCT coefficients and Ugokibeku Torr information, extracts the parameters needed for other decoding. The IDCT unit 1 3 2 DCT coefficients to inverse DCT conversion. The MC unit 1 3 3 performs motion compensation. That is, when or P picture for decoding B-pictures, previously decoded image based on the motion base transfected Le information read as the reference image from the frame memory 1 3 5, IDCT unit 1 3 2 outputs it that turn into decoded image by adding a. Decoded image, for display, or as a next reference image is temporarily stored in the frame memory 1 3 5. DISP unit 1 3 4 reads the decoded image is stored in the frame frame memory 1 3 5 performs processing such as interpolation of vertical or horizontal optionally as decoded Film image signal according to the synchronization of the display and outputs it to the outside.

Next, a description will be given of the case of performing the high-speed playback.

First, an instruction to perform the high-speed reproduction is inputted from the outside of the decoding apparatus 1 in IPB determination unit 1 2 1.

IPB determination unit 1 2 1 Based on the instruction, the system decoding unit 1 1 or et output encoded video data determines whether it is I, P, B pictures. As a result, if a B-picture inhibits the writing to the memory 1 2 2. Also, in the case of I or P-picture is allowed to write to the memory 1 2 2. In this way, it is possible to input from the encoded video data from the previously removed only B-pictures to the decoding unit 1 3.

Further, in the present invention, during high-speed reproduction has been than the normal reproduction from the encoded data storage device 2 at a high transfer rate Bok enable outputs the encoded data. Because, since the removal of the B-picture, that much because the next I or P picture earlier than usual is required.

Here, the high-speed transfer rate Bok mentioned mean the following. That is, as shown in FIG. 7, during high-speed playback data lik es Bok from only the decoding apparatus 1 minute to remove the B-picture frequently occurs than in the normal reproduction. Sign-data storage unit 2 has to be capable of outputting coded data corresponding to the frequent de Isseki requests Bok. Accordingly, the average value of the transfer rate one Bok coded data in this case is larger than the average value of the transfer rate Bok during the normal reproduction as shown in Figure 6.

Examples, Ι Β Β Ρ Β I as beta · · ', considering the case as is sandwiched by two B pixels Chiya is between P-pictures, fast playback transfer rate (the average value ) is usually required three times at the time of reproduction. Because is the picture data of the original 3 sheets (e.g. IBB), by removing the two B pictures between, because at a ratio to be consumed by the time for one sheet (I picture).

The transition of the data amount in the memory 1 2 2 in the case of the above is shown in Figure 9. B-pictures to be removed does not write data to the memory 1 2 2 at that portion does not increase the amount of data. Also because of the high data transfer rate, the slope of the portion in which the data when compared with FIG. 8 is increasing is larger. While removing B-picture as this I, is it possible to continuously P-picture is supplied to the decoding section 1 3 performs a smooth high-speed reproduction. Reproduction image when this is as the first 1 view (c).

Incidentally, in the above example has been described that you transfer the encoded data at a high rate Bok than normal to the coded data storage unit 2 or we decoding apparatus 1 at the time of high speed reproduction, that the performance of the device by physical factors, there is naturally an upper limit to the rate. Then the data transfer is too late, there is a case where I, can not be supplied to the P picture relevant catcher decoder 1 3 continuously. In this case A, the case number and the data of B-pictures to be cane e.g. removal often. In terms of Figure 7 is that the value of the above peak value as the average value of the data transfer rate is required. When this occurs consumed too early encoded data in the memory 1 2 2 by the decoding section 1 3, the supply of the encoded data catch up to it also outputs data request No. signal to the encoded data storage device 2 since no underflow in the memory 1 2 2 occurs. When an underflow occurs, and pause the decoding process until the memory 1 2 2 data of the next picture finishes accumulate, so must rather continues to wait as it is, the amount corresponding video signal pause time period cause that leads to a decrease in high-speed playback speed.

In the present invention, it was decided to provide a jump mechanism data read coded data Xi storage device 2 in order to minimize the decrease in the playback speed of the video signal even when Andafuro occurs. In Figure 1, an underflow occurs in the memory 1 2 2, conveys it to the speed adjuster 1 4 jump controller 2 3 provided code cade Isseki storage device 2 via. The jump controller 2 3 accordingly, the storage medium 2 by the encoded data read from 1 to control the data reading unit 2 8 so that a predetermined number of tracks jump connexion, can skip encoded data is there. Thereby suppresses the deterioration of the reproduction speed by en da one flow occurs.

The transition of the memory 1 2 2 data amount at the time of occurrence of underflow shown in 1 0 FIG.

Not communicating gun encoded data is generated in the area in which the track jump as described above has occurred. That is, there may occur an inconvenience to decoding is not a normal encoded data. However, the discontinuous portion of the data encoded by the track jump because there is a time lag until it is inputted to the underflow occurs after decoding device 1 for passing through the memory 2 2, discontinuity of the intact decoding apparatus it is impossible to know the generated point. In the present invention there, it is determined that the discontinuity when an error is detected during the decoding of the high-speed reproduction, it was decided to shift to a mode for decoding only I pictures. That is, to allow writing to the IPB determination unit 1 2 1 image coded picture only memory 1 2 2 by. Thus, in later than discontinuity of the coded data, it is made possible to perform high-speed playback to avoid decoding of P picture using the wrong reference picture.

Note that after detecting the I-picture is so that again I, return to the mode of decoding the P both pictures, it performs a smooth high-speed reproduction. The state of the playback picture image in the case of above is shown in the first FIG. 1 (d). I, and a period for the period and track jump for decoding P both pictures appear alternately. In this case as compared to the high-speed reproduction which performs only Bok rack jump FIG (b), it is possible to perform smoother high-speed reproduction. The above was as can be seen from the above, in the period between the track jump and track jump, I remove the B picture relevant catcher, and decodes only the P picture, coding from the storage device 2 in the period the average value of the transfer rate Ichito data is greater than the value in between the same period of normal reproduction.

Next, a description will be given of the case of the ultra-high-speed playback. The super high speed reproduction, a case where further high speed is required than the high-speed playback of the upper SL.

In the present embodiment, by actively jump recording Bok rack 2 1 1 encoded data shown in the first FIG. 3, to play popping fly a portion of the encoded data. Further, during the track jump and track jump, as in the case of the upper Symbol fast playback, the decoding apparatus 1 by decoding the I picture and P picture of the encoded video data, the ultra high-speed reproduction If it was also to perform as much as possible smooth playback. The state of the playback picture at ultra high-speed reproduction is shown in the first 2 FIG. Kake tight my rack jump instructs the decoding device 1 on the encoded data storage equipment 2. Decoding device 1 is determined by the tight over as follows.

In Figure 1, the system decoding unit 1 1 decodes the PTS (presentation tio n time stamp) in separating the encoded data to the encoded video data and encoded audio data, and passes the speed adjustment unit 1 4 . PTS is information indicating the time to display the individual picture data decrypted. Originally is information for allowing the use of that information during normal reproduction and outputs the decoded video data at an appropriate timing.

In the present embodiment uses the PTS to speed adjustment at super high speed reproduction. That speed adjustment unit 1 4, when receiving an instruction for ultra high-speed reproduction is, PTS value and the system decoding section 1 when it is assumed that reproduced in the original play than the speed greater the desired ultra high-speed reproduction speed comparing the PTS value at the current time passed from 1, it is to give an indication of track jump to the coded data storage device 2 when it is determined that exceeds a certain value the difference.

In this embodiment, as described above and enables ultra high-speed reproduction by the desired playback speed.

It will now be described a second embodiment of the present invention.

As described in the first embodiment, when an underflow occurs in the memory 1 2 2 at the time of high-speed reproduction, forcibly cause track jump so that skip code Cadet Isseki. In the present embodiment, by 揷入 an error code as a mark at a position by connexion data jump it is discontinuous, error detection, i.e. devised so as to be easy to detect discontinuities.

Figure 2 is a pro-click view of storage decoding apparatus 3 of the encoded video signal in the present embodiment. Parts common to the first embodiment will be omitted. When underflow occurs in the memory 1 2 2 decoding apparatus 1 at the time of high speed reproduction, the encoded data storage device 2, jump controller 2 3 by controlling the data reading section 2 8 to skip encoded data at the same time, temporarily switch the switch 2 5 to error code generator 2 4 side. And Te cowpea, an error code is 揷入 at a position jump occurs.

Encoded data inserted an error code enters the decoding device 1 3 via the memory 2 2, is further input to the system decoding unit 1 1, carbonochloridate Ffamemori unit 1 2 decoding unit 1 3 through the that. The inserted error one code have you to VLD unit 1 3 1 is detected. VLD unit 1 3 detects an error one code, notifies the MC unit 1 3 3, DISP unit 1 3 4 and IPB determining unit 1 2 1. MC unit 1 3 3 and D 1 3? Part 1 3 4, if the E error code is detected, so as to use the image stored in the frame memory 1 3 5 decodes immediately before the error as the never decoded images for continued Ku incorrect data in the code after disturbance. As described above, according to this embodiment, if the encoded data becomes discontinuous to a track jump during high-speed reproduction Thus from the middle, by 揷入 an error code to its position, in the encoder 1 error detection, and to facilitate detection of ie discontinuities.

It will now be described a third embodiment of the present invention.

As described in the first embodiment, when an underflow occurs in the memory 1 2 2 at the time of high-speed playback, jump controller 2 3 controls data reading portion 2 8 to skip encoded data. However, in the present embodiment, as the data of the I picture is not the middle discontinuous by jump, and to prevent the disturbance of the decoded image.

FIG. 3 is a pro click view of storage decoding apparatus 3 of the encoded video signal in the present embodiment. Parts common to the first embodiment will be omitted. The time of high speed reproduction in the upper figure switcher 2 6 coded data storage device 2 switches the switch 2 7 on the lower side. Memory 2 2 is Bas Ipasu By doing this, the encoded data is input directly from the data reading unit 2 2 to the decoding device 1. In this way, time lag definitive in the memory 2 2 was prevented from being generated during high-speed reproduction in the present embodiment.

Upon finding the I (P) picture during high-speed playback IPB determining unit 1 2 1 of a decoding apparatus 1, open between the switching circuit 1 4 until the picture is finished, underflow signal is coded data storage device 2 to prohibit the that Tsutawa to jump controller 2 3. And I connexion, if Anda one flow in the memory 1 2 2 I (P) picture in the middle of being accumulated is generated jump is inhibited Runode, data of the I picture complete without interruption in the middle It is stored in memory 1 2 2 form. Accordingly, the decoded image is not disturbed even if underflow has occurred.

In each of the above embodiments, an example is shown for decoding an encoded signal conforming to MPEG standards, the present invention is rather to be limited to such standards, other with similar properties also encoded signal encoding standard is applicability ability.

As described above, it is provided by the present invention, the storage device and the decoding device of the coded video signal to realize high-speed reproduction without providing a device for analyzing the encoded video signal to the encoding data evening accumulation within the device it is possible. Moreover, I, by decoding the P-picture, it is possible to achieve smooth high-speed reproduction. Industrial Applicability

According to the present invention, it marks Goka video signal to the decoding device from the storage device of the encoded video signal is input,

In the case of performing high-speed reproduction is inputted encoded video signal is analyzed by the image prediction method identification means provided in the decoding apparatus, image coding image and the forward predictive picture and a bidirectional predicted picture is identified that.

As a result, if when you have identified a bidirectional prediction image will stop writing to said second buffer memory provided in the decoding apparatus, was the image coding image or identifying the forward prediction image , resume writing to the same buffer memory. As such removal of the bidirectional prediction image, the image code Kaga image and send only the forward prediction image to the decoding unit. Only decodes the decoded in the image sent in part encoded image and forward prediction picture, and outputs. Since removal of the bidirectional predictive picture decoding apparatus as compared with the case (normal playback) which was not removed following encoded video signal is required to early. In the present invention, since the storage device of the encoded video signal which enables outputting data at a high transfer rate Bok than the normal reproduction at the time of high speed reproduction, to output a coded de one data to answer the request it is possible.

Still in the case of insufficient transfer rate I data, the storage device of the encoded movies image signal using the control means, forced reading skip as a portion of a recorded coded video signal in a storage medium controlling said signal reading means. In that case, the above-mentioned decoding apparatus output of the image prediction method identification means, when identifying the bidirectional prediction image or the forward prediction image writing to the second buffer memory in the decrypted device discontinued, when identifying the image coding image resume writing into the buffer memory. As such removal of the bidirectional predictive picture and forward predictive picture and sends only the images in the coded image to the decoding unit. Only decodes the image coded image sent in the decoding unit, and outputs.

As described above, it performs high-speed reproduction without providing a code analysis device inside the storage device encoded video signal. Further, by performing also the decoding of the forward prediction image in addition to image marks Goka image when high-speed playback, it is possible to realize a smooth high-speed reproduction.

Claims

The scope of the claims
1. Having a storage device for Play output encoded video signal recorded in the storage medium, a decoding device and to obtain a decoded video signal by decoding the encoded video signal reproduced output from the storage device, code message ヽ the accumulation decoding apparatus of video signal
Said storage device,
A signal reading means for reading the encoded video signal from a storage medium storing encoded video signal,
A first buffer memory for storing temporarily an output of said signal reading means, in response to a signal from outside of the storage device, forcibly skip part of the recorded coded video signal in the storage medium and control means for controlling said signal reading means as,
The read out coded video signal from the first buffer memory, de in a period of the coding image signal is output in the same sequential order as the recording - faster than the average data transfer rate is the normal reproduction shall apply to the encoded video signal can output storage device to the outside,
The decoding device,
As input coded video signal output from said storage device,
By analyzing the input the coded video signal, the image prediction method identifying means for identifying the image coding image and the forward predicted picture and a bidirectional predicted picture, temporarily the entered the encoded video signal and a second buffer memory for storing,
Comprising a decoding means for decoding reads the encoded video signal stored in said second buffer memory,
On the basis of the output of the image prediction method identifying means, only the image in the coded image and the forward predicted picture stored in the second buffer memory among the input the encoded video signal, in the decoding unit image code a first decoding mode, based on the output of the image prediction method identifying means, only the image in the code Kaga image among the input the encoded video signal the for decoding only coded image and the forward predictive picture stored in the second buffer memory, storing decoded encoded signal, wherein said decoding means is a decoder and a second decoding mode for decoding only image marks Goka image apparatus.
2. In the accumulation decoding device of the coded video signal in the range first claim of claim, the decoding device,
During decoding the coded video signal in the first decoding mode, forcibly read skip control portion of a recorded coded video signal in the storage medium in the storage equipment is performed by the control means by the above first
Storing the decoding device of the coded video signal, characterized in that the decoding device shifts to the second decoding mode one mode.
3. In the storage decoding device of the coded video signal in the range first claim of claim, the decoding device,
Comprising an error detecting means for detecting an error in decoding,
During decoding the coded video signal in the first decoding mode, and characterized in that by an error is detected by the error detection means, a decoding apparatus to shift to the second decoding mode storing the decoding device of the coded video signal to.
4. In the storage decoding device of the coded video signal in the range 3 claim of claim, the storage device,
And signal generating means for generating an error code,
; And a SWITCHING means switches between the outputs of the signal generating means of said signal reading means, when skip encoded video signal, Yore said switching means at a place skipped, Erako one Te de accumulation decoding device of the coded video signal, characterized by 揷入 a.
5. In the storage decoding device of the coded video signal in the range first claim of claim, the decoding device,
It monitors the amount of data accumulated in the second buffer memory, comprising the underflow detection means for outputting an underflow signal when it is below a certain de Isseki amount value,
The Anda monounsaturated port first signal output to the storage device,
Said storage device,
It said the Andafuro signal inputted to the control means, storing the decoding device of the coded video signal, characterized in that skip a portion of a recorded coded video signal in the storage medium in accordance with the Andafuro signal.
6. In the accumulation decoding device of the coded video signal in the range 5 claim of claim, the decoding device,
The underflow signal comprises a switching means for selecting whether to output to the storage device,
On the basis of the output of the image prediction method identification means, when it detects the image coding image during the Andafu opening one of the image to the decoding means completes reading from the second buffer memory a signal switching the switching means so as not to output to the storage device,
Said storage device,
The output of said signal reading means, and switch the output of the first buffer memory comprises a switching means for outputting to the decoding device,
Using said switching means, accumulating the decoding device of the coded video signal, characterized in that the output of said signal reading means includes a mode to be output to the decoding device without passing through the first buffer memory.
7. Having a storage device for the encoded video signal recorded in the storage medium for reproducing output, a decoding device and to obtain a decoded video signal by decoding the encoded video signal reproduced output from the storage device, code a storage decoding apparatus of video signal,
Said storage device,
A signal reading means for reading the encoded video signal from a storage medium storing the encoded video signal,
A buffer memory for storing temporarily an output of said signal reading means, in response to a signal from outside of the storage device, forced reading skip manner above a part of the recorded coded video signal in the storage medium and control means for controlling the signal reading means,
Reads the encoded video signal from said first buffer memory, faster than when the average value of the de Isseki transfer rate Bok normal reproduction in period the coding video signals are output in the same sequential order as the recording an output depot device the encoded video signal to the outside,
Storing the decoding device of the coded video signal, characterized in that the input to the decoder reads the encoded video signal from said buffer memory.
8. Shall apply in the decoding device of the coded video signal to output the encoded video signal as by decoding decoded video signal,
Analyzes the input coded video signal, the image prediction method identifying means for identifying the image coding image and the forward predicted picture and a bidirectional prediction image,
Comprising a buffer memory for storing input the encoded video signal temporarily, and decoding means for decoding reads the encoded video signal stored in the buffer memory,
On the basis of the output of the image prediction method identifying means, only the image in the coded image and the forward predicted picture stored in the buffer memory among the input the encoded video signal, said decoding means and image encoded image a first decoding mode for decoding only forward prediction image, based on the output of the image prediction method identifying means, only the image in the coded image among the input the encoded video signal stored in the buffer memory , decoding device encoded movies image signal and having a second decoding mode for the decoding means to decode only image coded image.
9. Having a storage device for the encoded video signal recorded in the storage medium for reproducing output, a decoding device and to obtain a decoded video signal by decoding the encoded video signal reproduced output from the storage device, code flashing Party B the accumulation decoding apparatus of video signal,
Said storage device,
A signal reading means for reading the encoded video signal from a storage medium storing the encoded video signal,
A first buffer memory for storing temporarily an output of said signal reading means, in response to a signal from outside of the storage device, forced reading skip as a portion of a recorded coded video signal in the storage medium and control means for controlling said signal reading means,
It reads the encoded video signal from said first buffer memory, de in a period of the coding image signal is output in the same sequential order as the recording - the average value of the data transfer rate of the normal reproduction 3 times an output depot device the encoded video signal to the outside values,
The decoding device,
As input coded video signal output from said storage device,
By analyzing the input the coded video signal, the image prediction method identifying means for identifying the image coding image and the forward predicted picture and a bidirectional predicted picture, temporarily the entered the encoded video signal and a second buffer memory for storing,
Comprising a decoding means for decoding reads the encoded video signal stored in said second buffer memory,
On the basis of the output of the image prediction method identifying means, only the image in the coded image and the forward predicted picture stored in the second buffer memory among the input the encoded video signal, in the decoding unit image code a first decoding mode for decoding only coded image and the forward predictive picture,
On the basis of the output of the image prediction method identification unit, 蓄 example only image coded image to the second buffer memory among the input the encoded video signal, the decoding means only image coded image storing the decoding device of the coded video signal, which is a decoding device and a second decoding mode for decoding.
1 0. Having a storage device for the encoded video signal recorded in the storage medium for reproducing output, a decoding device and to obtain a decoded video signal by decoding the encoded video signal reproduced output from said storage device, filed in the storage decoder encoded signal
The decoding device,
As input coded video signal output from said storage device,
By analyzing the input the encoded video signal temporarily and image prediction method identifying means for identifying an image in the code I spoon image and the forward predicted picture and a bidirectional predicted picture, the input the encoded video signal a first buffer memory for storing in,
Comprising a decoding means for decoding reads the coded video signals stored in said first buffer memory,
Based on the output of the image prediction method identification unit Te, only the image within the coded picture and the forward predicted picture stored in the first buffer memory among the input the encoded video signal, said decoding means image a first decoding mode for decoding only the inner coded picture and forward prediction image,
Output based t of the image prediction method identification unit Te, the inputted 蓄 example only image coded image to the first buffer memory of the encoded video signal, said decoding means image code a second decoding mode for decoding only coded image,
A decoding apparatus having a de - all input the encoded video signal stored in said first buffer memory, a third decoding duck said decoding means to decode all encoded video signal Te,
Said storage device,
A signal reading means for reading the encoded video signal from a storage medium storing encoded video signal,
And a second buffer memory for temporarily storing the output of said signal reading means,
Upon request from the decoding apparatus, the second buffer memory reads marks Goka video signal, code from said second buffer memory to a request from the decoding apparatus of the third decoding mode the average value of the high-speed data transfer rate than the average value of the data transfer rate Bok during reading of the video and signal, the first response to a request from the decoding apparatus of the first and second decoding mode storing the decoding device of the coded video signal, characterized in that the second buffer memory is capable of outputting storage device encoded video signal to the outside.
PCT/JP1995/001454 1995-07-21 1995-07-21 Device for decoding encoded video signal and storing and decoding device using it WO1997004598A1 (en)

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JP2004274694A (en) * 2002-07-11 2004-09-30 Matsushita Electric Ind Co Ltd Image coding method and image decoding method
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