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`the following document, Publication of Unexamined Patent Application, JP,
`This is to certify that
`H11-187367 (A), containing five pages, originally in Japanese, is a true and accurate English translation
`to the best of my knowledgeandbelief.
`
`Date: March 21, 2019
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`Elica Funatsu
`Translator
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`Swornto and signed before me this ©? (\7_ dayof elee Ba , 2019.
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`VIMEO/IAC EXHIBIT 1013
`VIMEO ETAL., v. BT, IPR2019-00833
`
`VIMEO/IAC EXHIBIT 1013
`VIMEO ET AL., v. BT, IPR2019-00833
`
`

`

`(19) Japanese Patent Office (JP)
`
`(12) Publication of Unexamined Patent Application (A)
`
`(11) Patent application
`publication number
`JP, H11-187367
`
`(51) Int. Cl6
`
`
`H 04 N 7/10
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`7/24
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`Identification symbol
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`H 04 N 7/10
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`(43) Date of publication 7-9-1999
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`Z
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`Request for examination Requested Number of claims 8 OL (Total 5 pages)
`
`(21) Application filing number 9-350752
`12-19-1997
`(22) Date of application
`
`(71) Applicant 000004237
`
`
`NEC Corp.
`
`
`5-7-1 Shiba Minato-ku Tokyo
`(72) Inventor Yasuyuki Muroi
`
`
`NEC Corp. 5-7-1 Shiba Minato-ku Tokyo
`(74) Agent
`Naoki Kyomoto, patent attorney
`
`
`
`(and two other persons)
`
`(54) 【Title of the invention】A video transmission device, a video receiver device, and a video delivery system using
`
`
`
` said devices
`
`display unit
`
`Video
`
`memory
`Buffer
`
`receiver unit
`Video data
`
`detection unit
`Data volume
`
`Rate switching
`
`request unit
`
`3
`
` path
`Delivery
`
`transmission
`Video data
`
`unit
`
`receiver unit
`Rate switching
`
`(3)
`data
`Video
`
`(2)
`data
`Video
`
`(1)
`data
`Video
`
`rate switching unit
`
`Video data
`
`Video receiver device
`
`Video transmission device
`
`(57) 【Abstract】
`【Problem intended to be solved by the invention】Pre-
`vent interruption of video caused by changes in delivery
`bandwidth of the delivery path when transmitting digital
`video images, and reproduce video using a reproducing
`rate of the highest bandwidth possible.
`【Means for solving the problem】A video transmission
`device 1 is provided with video data (1) through (3) having
`a plurality of video rates; a video receiver device 2 detects
`changes in delivery bandwidth on a delivery path 3 using
`data volume in a buffer memory 22, and a rate switching
`request signal is sent to the video transmission device 1 to
`switch between video data (1) through (3), thereby pre-
`venting interruption of video and realizing transmission of
`higher image quality video data.
`
`

`

`(2)
`
`【Scope of the claims】
`【Claim 1】A video delivery system characterized as fol-
`lows: a video transmission device is provided with a plurality
`of video data having different video rates for the same video;
`data volume in a buffer memory of a video receiver device
`that temporarily stores the video data delivered from the vid-
`eo transmission device is detected during video reproduction;
`and, when the data volume is less than a first reference value,
`video data is transmitted upon switching to video data that has
`a video rate lower than the video rate of the video data cur-
`rently being transmitted; and, when the data volume exceeds
`a second reference value having a greater value than the first
`reference value, video data is transmitted upon switching to
`video data having a video rate higher than the video rate of the
`video data currently being transmitted.
`【Claim 2】A video delivery system characterized as being
`provided with a video transmission device and a video re-
`ceiver device that is linked to said video transmission device;
`further wherein,
`said video transmission device is provided with the follow-
`ing:
`a plurality of video data having different video rates for the
`same video;
`a rate switching receiver unit that receives a video rate switch-
`ing request signal for video data, said signal transmitted by
`the video receiver device; and,
`a video data rate switching unit that selects one of the plural-
`ity of video data and transmits it to the video receiver device
`and, further, in accordance with the video rate switching re-
`quest signal, switches video data to video data having a higher
`video rate or a video rate lower than the video data currently
`being transmitted and transmits the selected video data; and,
`said video receiver device is provided with the following:
`a buffer memory that temporarily stores video data received
`from the video transmission device;
`a data volume detection unit that, during reproduction of vid-
`eo data, detects the volume of video data stored in the buffer
`memory and compares the video data volume to a first refer-
`ence value and a second reference value that is greater than
`the first reference value; and,
`a rate switching request unit that, in the event the video data
`volume falls below the first reference value, transmits a video
`rate switching request signal to the video transmission device
`to switch to video data having a lower video rate than the
`video data currently being transmitted and, in the event the
`video data volume exceeds the second reference value that is
`greater than the first reference value, to switch to video data
`having a higher video rate than the video data currently being
`transmitted.
`【Claim 3】The video delivery system of claim 2, further
`characterized by the data volume detection unit detecting the
`data volume stored in the buffer memory at fixed intervals
`during reproduction of the video data.
`【Claim 4】The video delivery system of claims 1 and 2,
`further characterized by the first reference value and the sec-
`ond reference value being provided per aggregate of video
`contained in the same program.
`【Claim 5】A video transmission device characterized as be-
`ing provided with the following:
`a plurality of video data having different video rates for the
`same video;
`a rate switching receiver unit that receives a video rate switch-
`ing request signal for video data, said signal transmitted by
`the video receiver device; and,
`
`JP, H11-187367(A)
`a video data rate switching unit that selects one of the plu-
`rality of video data and transmits it to the video receiver de-
`vice and, further, in accordance with the video rate switch-
`ing request signal, switches video data to a video rate higher
`or a video rate lower than the video data currently being
`transmitted and transmits the selected video data.
`【Claim 6】A video receiver device characterized by be-
`ing provided with the following:
`a buffer memory that temporarily stores video received
`from a video transmission device;
`a data volume detection unit that, during reproduction of
`video data, detects video data volume stored in the buffer
`memory and compares the video data volume to a first ref-
`erence value and a second reference value that is greater
`than the first reference value; and,
`a rate switching request unit that, in the event the video
`data volume falls below the first reference value, transmits
`a video rate switching request signal to the video transmis-
`sion device to switch to video data having a lower video
`rate than the video data currently being transmitted and, in
`the event the video data volume exceeds the second refer-
`ence value that is greater than the first reference value, to
`switch to video data having a higher video rate than the
`video data currently being transmitted.
`【Claim 7】The video receiver device of claim 6, further
`characterized by the data volume detection unit detecting
`data volume stored in the buffer memory at fixed intervals
`during reproduction of video data.
`(Claim 8】The video receiver device of claim 6, further
`characterized by the first reference value and the second
`reference value being provided per aggregate of video con-
`tained in the same program.
`【Detailed description of the invention】
`【0001】
`【Technical field to which the invention pertains】The
`present invention relates to a video transmission device, a
`video receiver device, and a video delivery system that uses
`these [devices]; and, in particular, relates to a video trans-
`mission device, a video receiver device, and a video de-
`livery system using these devices that operate correspond-
`ingly to decrease in delivery speed of video data caused by
`changes in traffic on the delivery path.
`【0002】
`【Prior art】Conventionally, when transferring moving
`images via a line such as the Internet and the like in which
`data delivery speed was not guaranteed, the bandwidth us-
`able for delivery varied by changes in traffic on the delivery
`path; and, when the video data transmission rate from the
`server that distributes video to a client that receives and dis-
`plays video data fell below the required transfer rate, suf-
`ficient data volume could not be sent from the server to the
`client, resulting in interruption in video.
`【0003】In light of this problem, Publication of Japanese
`Patent Application, JP, H07-222113, discloses an example
`of a video reproducing device wherein video will not be
`interrupted even when sufficient data volume cannot be de-
`livered. In this publication, when the volume of received
`data stored in a video information temporary storage means
`provided to the video reproducing device decreases, the
`video information reproducing rate is controlled to a slow
`reproduction rate or use of still images to prevent interrup-
`tion of video.
`
`

`

`(3)
`
`【0004】
`【Problem intended to be solved by the invention】In the
`technology described above, when the stored volume of re-
`ceived data decreases, the video information reproducing rate
`is controlled to a slow reproduction rate or use of still images,
`which allowed for continuous video but there was a problem
`wherein natural video could not be realized when slow repro-
`duction rate or use of still images continued.
`【0005】An object of the present invention is to prevent
`interruption in video without controlling video information
`reproduction rate when the volume of received data that is
`stored decreases.
`【0006】
`【Means for solving the problem】A first video delivery sys-
`tem according to the invention is characterized as follows:
`a video transmission device is provided with a plurality of
`video data having different video rates for the same video;
`data volume in a buffer memory of a video receiver device
`that temporarily stores the video data transmitted from the
`video transmission device is detected during video reproduc-
`tion; and, when the data volume is less than a first reference
`value, video data is transmitted upon switching to video data
`that has a video rate lower than the video rate of the video
`data currently being transmitted; and, when the data volume
`exceeds a second reference value having a greater value
`than the first reference value, video data is transmitted upon
`switching to video data having a video rate higher than the
`video rate of the video data currently being transmitted.
`【0007】A second video delivery system according to the
`invention is characterized as being provided with a video
`transmission device and a video receiver device that is linked
`to said video transmission device; further wherein, the video
`transmission device is provided with the following: a plural-
`ity of video data having different video rates for the same
`video; a rate switching receiver unit that receives a video rate
`switching request signal for video data, said signal transmitted
`by the video receiver device; and, a video data rate switching
`unit that selects one of the plurality of video data and trans-
`mits it to the video receiver device and, further, in accordance
`with the video rate switching request signal, switches video
`data to video data having a higher video rate or a lower video
`rate than the currently transmitted video data and transmits
`the selected video data; and, the video receiver device is pro-
`vided with the following: a buffer memory that temporarily
`stores video data received from the video transmission de-
`vice; a data volume detection unit that, during reproduction
`of video data, detects the volume of video data stored in the
`buffer memory and compares the video data volume to a first
`reference value and a second reference value that is greater
`than the first reference value; and, a rate switching request
`unit that, in the event the video data volume falls below the
`first reference value, transmits a video rate switching request
`signal to the video transmission device to switch to video data
`having a lower video rate than the video data currently being
`transmitted and, in the event the video data volume exceeds
`the second reference value that is greater than the first refer-
`ence value, to switch to video data having a higher video rate
`than the video data currently being transmitted.
`【0008】A third video delivery system according to the in-
`vention is characterized as the second video delivery system in
`the invention, further characterized by the data volume detec-
`tion unit detecting the data volume stored in the buffer memory
`at fixed intervals during reproduction of the video data.
`
`JP, H11-187367(A)
`【0009】A fourth video delivery system according to the
`invention is characterized as the first and the second video
`delivery system in the invention, further characterized by
`the first reference value and the second reference value be-
`ing provided per aggregate of video contained in the same
`program.
`【0010】A video transmission device according to the in-
`vention is characterized as being provided with the follow-
`ing: a plurality of video data having different video rates
`for the same video; a rate switching receiver unit that re-
`ceives a video rate switching request signal for video data,
`said signal transmitted by the video receiver device; and,
`a video data rate switching unit that selects one from the
`plurality of video data and transmits it to the video receiv-
`er device and, further, in accordance with the video rate
`switching request signal, switches video data to a video rate
`higher or a video rate lower than the video data currently
`being transmitted and transmits the selected video data.
`【0011】A first video receiver device according to the
`invention is characterized by being provided with the fol-
`lowing: a buffer memory that temporarily stores video data
`received from a video transmission device; a data volume
`detection unit that, during reproduction of video data, de-
`tects video data volume stored in the buffer memory and
`compares the video data volume to a first reference value
`and a second reference value that is greater than the first
`reference value; and, a rate switching request unit that, in
`the event the video data volume falls below the first refer-
`ence value, transmits a video rate switching request signal
`to the video transmission device to switch to video data
`having a lower video rate than the video data currently be-
`ing transmitted and, in the event the video data volume ex-
`ceeds the second reference value that is greater than the
`first reference value, to switch to video data having a higher
`video rate than the video data currently being transmitted.
`【0012】A second video receiver device according to the
`invention is the first video receiver device in the invention,
`further characterized by the data volume detection unit de-
`tecting data volume stored in the buffer memory at fixed
`intervals during reproduction of video data.
`【0013】A third video receiver device according to the in-
`vention is the first video receiver device in the invention,
`further characterized by the first reference value and the
`second reference value being provided per aggregate of
`video contained in the same program.
`【0014】
`【Embodiment of the invention】The following is a de-
`tailed description of an embodiment of the invention and
`refers to drawings.
`【0015】Figure 1 is a block diagram depicting the config-
`uration of a first embodiment of the invention, comprising
`a video transmission device 1 that transmits video data, a
`video receiver device 2 that receives video data, and a de-
`livery path 3 that connects the video transmission device 1
`and the video receiver device 2 and delivers video data.
`【0016】The video transmission device 1 is provided with the
`following: video data (1) through video data (3) that have dif-
`ferent reproducing rates for the same video; a video data rate
`switching unit 11 that switches between any one of video data (1)
`through video data (3); a video data transmission unit 12 that
`
`

`

`(4)
`transmits video data that is output from the video data rate
`switching unit 11 to the video receiver device 2 via the
`delivery path 3; and, a rate switching receiver unit 13 that
`receives a rate switching request from the video receiver
`device 2.
`【0017】Further, the video receiver device 2 is provided
`with the following: a video data receiver unit 21 that re-
`ceives video data; a buffer memory 22 that stores video
`data received by the video data receiver unit 21; a video
`display unit 23 that sequentially acquires video data stored
`in the buffer memory 22 and reproduces video; a data
`volume detection unit 24 that detects data volume in the
`buffer memory 22; and, a rate switching request unit 25
`that makes a request to the video transmission device 1 to
`switch video data rate.
`【0018】Figure 2 is an illustration depicting data volume
`in the buffer memory and reference values.
`【0019】Next, the operation of an embodiment of the in-
`vention is described in detail and references figures 1 and
`2.
`【0020】As to video data transmitted from the video data
`transmission unit 12 of the video transmission device 1,
`the video data rate switching unit 11 arbitrarily selects one
`from among the plurality of video data (1) through (3) and
`transmits the selected video data to the video data receiver
`unit 21 of the video receiver device 2 via the delivery path
`3. The video data receiver unit 21 temporarily stores the
`received video data in the buffer memory 22.
`【0021】The video display unit 23 takes video data out
`from the buffer memory 22 and reproduces video. The data
`volume stored in the buffer memory 22 increases or de-
`creases by changes in delivery speed of video data associ-
`ated with traffic fluctuation on the delivery path 3. In other
`words, when the video data transmission rate starts to fall
`below the required transfer rate, data volume stored in the
`buffer memory 22 will also start to decrease.
`【0022】As shown in figure 2, a first reference value (a)
`and a second reference value (b) are set for data volume in
`the buffer memory 22, having a relationship of the first ref-
`erence value (a) < the second reference value (b). The first
`reference value and the second reference value are provid-
`ed per aggregate of video contained in the same program.
`【0023】During reproduction of video data, when the vol-
`ume of data stored in the buffer memory 22 falls below the
`first reference value or exceeds the second reference value,
`the data volume detection unit 24 instructs the rate switch-
`ing request unit 25 to issue a rate switching request.
`【0024】In the event data volume stored in the buf-
`fer memory 22 falls below the first reference value, the
`rate switching request unit 25 makes a request to the rate
`switching receiver unit 13 in the video transmission device
`1 to switch to video data with a lower video rate than the
`video data currently being transmitted. Further, when the
`data volume stored in the buffer memory 22 exceeds the
`second reference value, the rate switching request unit 25
`makes a request to the rate switching receiver unit 13 in the
`video transmission device 1 to switch to video data hav-
`ing a video rate higher than the video data currently being
`transmitted.
`
`JP, H11-187367(A)
`【0025】The rate switching receiver unit 13 of the video
`transmission device 1 receives the rate switching request
`from the rate switching request unit 25 and notifies the vid-
`eo data rate switching unit 11.
`【0026】Now, the video transmission device 1 is provided
`with video data with three types of video rates, wherein the
`bit rate increases in the order of video data (1) to video data
`(2) and then video data (3). Here it is assumed the video
`data currently being transmitted is video data (2). In this in-
`stance, since bit rate increases in the order of video data (1)
`to video data (2) to video data (3), video data (1) is a low
`bit rate with faster transmission speed but the picture qual-
`ity deteriorates accordingly and, while transmission speed
`slows down with higher bit rates when switching to video
`data (2) and to video data (3), picture quality improves ac-
`cordingly.
`【0027】When the video data rate switching unit 11 re-
`ceives a request to switch to video data having a video rate
`lower than the currently transmitted video data, the video
`data rate switching unit 11 switches video data from video
`data (2) to video data (1) and, when a request to switch to
`video data having a video rate higher than the currently
`transmitted video data is received, it switches from video
`data (2) to video data (3).
`【0028】After that, the data volume detection unit 24 in
`the video receiver device 2 detects the data volume stored
`in the buffer memory 22 per fixed intervals, and the opera-
`tion described above is repeated.
`【0029】
`【Effects of the invention】A first effect of the invention
`is, by switching video data transmitted from the video
`transmission device to a low video rate when data volume
`received and stored in the buffer memory decreases, the
`invention prevents interruptions in video display without
`controlling video data reproduction speed on the video re-
`ceiver device side.
`【0030】A second effect of the invention is, when using
`a network in which delivery speed fluctuates by traffic on
`the delivery path, the invention realizes video reproduction
`with the highest picture quality possible by changing the
`video rate dynamically according to the state of the net-
`work at a given point in time.
`【Brief description of drawings】
`【Figure 1】A block diagram depicting the configuration
`of an embodiment of the invention.
`【Figure 2】A diagram depicting data volume in the buffer
`memory and reference values.
`【Description of symbols】
`1
`Video transmission device
`11
`Video data rate switching unit
`12
`Video data transmission unit
`13
`Rate switching receiver unit
`2
`Video receiver device
`21
`Video data receiver unit
`22
`Buffer memory
`23
`Video display unit
`
`

`

`24
`25
`
`Data volume detection unit
`Rate switching request unit
`
`3
`
`Delivery path
`
`(5)
`
`JP, H11-187367(A)
`
`Video transmission device
`
`Video receiver device
`
`【Figure 1】
`
`Rate switching
`receiver unit
`
`Video data
`transmission
`unit
`
`Video data
`rate switching unit
`
`Video
`data
`(1)
`
`Video
`data
`(2)
`
`Video
`data
`(3)
`
`Delivery
` path
`3
`
`Rate switching
`request unit
`
`Data volume
`detection unit
`
`Video data
`receiver unit
`
`Buffer
`memory
`
`Video
`display unit
`
`【Figure 2】
`
`(Buffer memory)
`
`0
`
`
`
`
`
`
`↑
`First reference value
`(a)
`
`
`
`
`
`
`↑
`Second reference value
`(b)
`
` Max
`
`[0<(a)<(b)<Max]
`
`