EP0602943A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for reproducing multiplexed data from a record medium
Assignee: Sony Corp
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Filing: 1993-12-15
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Granted: —
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Expires: 2013-12-15
Abstract
Abstract Video data is reproduced from a record medium on which is recorded, in multiplexed form, the video data, reference time data representing a reference time, and video time data representing the time at which decoding of the video data reproduced from the record medium should begin. The reference time data is separated (5A) from the reproduced multiplexed data and used to generate timing data. The video data and video time data are temporarily stored in a video buffer (6A) and a video time data extractor (30) is connected to an output of the video buffer to extract the video time data from the contents of the video buffer. The video buffer (6A) also is connected to a video decoder (7) which decodes the video data temporarily stored in the video buffer, the operation of the video decoder being controlled (31) as a function of a comparison between the generated timing data and the extracted video time data.
Inventors
- 👤 Yasushi C/O Intellectual Prop. Div. Fujinami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:30
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/24; H04N7/52; H04N7/54; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N21/00; H04N21/40; H04N21/41; H04N21/426; H04N21/42646; H04N21/43; H04N21/4302; H04N21/4307; H04N21/43072; H04N21/432; H04N21/4325; H04N21/434; H04N21/4341; H04N5/92; H04N5/926; H04N5/9261; H04N5/9264; H04N5/9265; H04N5/9267; H04N5/84; H04N5/85; H04N5/94; H04N5/945
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
179 words
Apparatus for reproducing video data from a record medium on which is recorded in multiplexed form the video data, reference time data representing a reference time and video time data representing the time at which decoding of said video data reproduced from the record medium should begin, said apparatus comprising: reference time data separating means (5A) for separating said reference time data from the reproduced multiplexed data and for generating timing data based thereon; a video buffer (6A) for temporarily storing the video data and video time data which are reproduced from said record medium; a video time data extractor (30) coupled to said video buffer for extracting the video time data from said video buffer; a video decoder (7) for decoding the video data temporarily stored in said video buffer, said video buffer being connected to said video time data extractor and to said video decoder; and synchronizing control means (31) coupled to receive and compare said generated timing data and said extracted video time data and for controlling said video decoder as a function of the comparison.
Claim 2
Dependent Claim
46 words
Apparatus according to claim 1, wherein said reference time data separating means (5A) includes a clock generator (27) for generating clock signals, and means (26; 26A) for incrementing a reference time established by said reference time data with said clock signals to generate said timing data.
Claim 3
Dependent Claim
39 words
Apparatus according to claim 2, wherein said synchronizing control means is operative to sense when said timing data is substantially equal to said extracted video time data to initiate the decoding of said video data by said video decoder.
Claim 4
Dependent Claim
41 words
Apparatus according to claim 3, wherein said synchronizing control means (31) is further operative to sense when said timing data and said extracted video time data differ from each other by at least a predetermined amount, thereby indicating a synchronizing error.
Claim 5
Dependent Claim
71 words
Apparatus according to claim 4, for reproducing said video data which is recorded on said record medium as a series of video pictures, each video picture exhibiting a picture interval, wherein said synchronizing control means (31) is additionally operative to delay by a picture interval the decoding of video data by said video decoder (7) when said extracted video time data exceeds said timing data by at least said predetermined amount.
Claim 6
Dependent Claim
50 words
Apparatus according to claim 5, wherein said synchronizing control means (31) is still further operative to cause said video decoder (7) to skip to a next picture interval for decoding said next picture interval when said timing data exceeds said extracted video time data by at least said predetermined amount.
Claim 7
Dependent Claim
160 words
Apparatus according to claim 1, for use where the multiplexed data recorded on said record medium further includes audio data and audio time data representing the time at which decoding of said audio data reproduced from the record medium should begin, including an audio buffer (8A) for temporarily storing the audio data and audio time data which are reproduced from said record medium, an audio time data extractor (32) for extracting the audio time data from said audio data reproduced from said record medium, and an audio decoder (9) for decoding the reproduced audio data temporarily stored in said audio buffer, wherein said audio buffer (8A) is connected to said audio time data extractor and to said audio decoder, and wherein said synchronizing control means (31) is further coupled to receive said extracted audio time data and to compare said audio time data to said generated timing data for controlling said audio decoder (9) as a function of the comparison.
Claim 8
Dependent Claim
47 words
Apparatus according to claim 7, wherein said synchronizing control means (31) is additionally operative to compare the extracted video time data to the extracted audio time data for controlling a selected one of the video decoder (7) or the audio decoder (9) in response to the comparison.
Claim 9
Dependent Claim
76 words
Apparatus according to claim 3, for reproducing said video data which is recorded on said record medium as a series of video pictures exhibiting respective picture intervals, comprising means for generating an interrupt command to temporarily interrupt the reproduction of new multiplexed data from said record medium, and wherein said video decoder (7) is responsive to said interrupt command to delay until the interrupt command terminates the decoding of a next picture interval of video data.
Claim 10
Dependent Claim
63 words
Apparatus according to claim 9, wherein said means (26A) for incrementing a reference time is inhibited for the duration of said interrupt command, and wherein said synchronizing control means (31) is further operative to sense when the extracted video time data is greater than said timing data to cause said video decoder not to decode the video data of said next picture interval.
Claim 11
Dependent Claim
57 words
Apparatus according to claim 10, wherein said means (26A) for incrementing is enabled when the interrupt command terminates, and wherein said synchronizing control means (31) is additionally operative to sense when said timing data is greater than said extracted video time data to cause said video decoder (7) to decode said next picture interval of video data.
Claim 12
Dependent Claim
63 words
Apparatus according to claim 7, comprising means for generating an interrupt command to temporarily interrupt the reproduction of new multiplexed data from said record medium, and wherein the video and audio decoders (7, 9) are responsive to said interrupt command to delay until said interrupt command terminates the decoding of video and audio data stored in said video and audio buffers (6A, 8A).
Claim 13
Dependent Claim
55 words
Apparatus according to claim 3, comprising means (28A) for generating a re-read command to cause re-reproduction of the multiplexed data from a portion of said record medium and to cause said video decoder (7) to delay the decoding of video data temporarily stored in said video buffer (6A) until re-reproduced video data is supplied thereto.
Claim 14
Dependent Claim
68 words
Apparatus according to claim 13, wherein said means (26A) for incrementing a reference time is inhibited until said re-reproduced video data is supplied to said video buffer (6A), and wherein said synchronizing control means (31) is further operative to sense when the extracted video time data is greater than said timing data to cause said video decoder (7) not to decode the video data in said video buffer.
Claim 15
Dependent Claim
64 words
Apparatus according to claim 14, wherein said means (26A) for incrementing is enabled when re-reproduced multiplexed data is supplied to said video buffer (6A), and wherein said synchronizing control means (31) is additionally operative to sense when said timing data is greater than said extracted video time data to cause said video decoder (7) to decode the video data then in said video buffer.
Claim 16
Dependent Claim
66 words
Apparatus according to claim 7, comprising means (28A) for generating a re-read command to cause re-reproduction of the multiplexed data from a portion of said record medium and to cause said video and audio decoders (7, 9) to delay the decoding of video and audio data temporarily stored in said video and audio buffers (6A, 8A), respectively, until re-reproduced video and audio data are supplied thereto.
Claim 17
Dependent Claim
120 words
Apparatus according to claim 16, wherein said reference time data separating means (5A) includes a clock generator (27) for generating clock signals and increment means (26A) for incrementing a reference time established by said reference time data with said clock signals to generate said timing data, said increment means being inhibited until said re-reproduced video and audio data are supplied to said video and audio buffers, and wherein said synchronizing control means (31) is further operative to sense when at least one of the extracted video and audio time data is greater than said timing data to cause said video and audio decoders not to decode the video and audio data in the video and audio buffers (6A, 8A), respectively.
References Cited (Backward Citations)
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