Patent EP0522853A2 successfully refreshed from Google Patents.
EP0522853A2
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Digital data reproducing apparatus and method
Assignee: Sony Corp
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Filing: 1992-07-09
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Granted: —
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Expires: 2012-07-09
Abstract
Abstract A digital data reproducing apparatus and method which allows picture reproduction for a long period of time without deterioration in picture quality is described. Data are reproduced from an optical disk (16) by a pickup (41) and are transferred to and stored into a ring buffer memory (45). Data read out from the ring buffer memory (45) are transferred to and stored into a video code buffer (21) of a decoder section (31). The data stored in the video code buffer (21) are decoded in the decoder section (31) and displayed on a display (29). A track jump judging circuit (47) produces, when the amount of data stored in the ring buffer memory (45) reaches a predetermined value set in advance, a track jumping instruction to cause the pickup (41) to perform track jumping back by one track distance.
Inventors
- 👤 Jun c/o Patents Div. Sony Corp. Yonemitsu
- 👤 Hideki c/o Patents Div. Sony Corp. Koyanagi
- 👤 Yoshiyuki c/o Patents Div. Sony Corp. Akiyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 22:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; G11B20/00; G11B20/10; G11B20/10527; H; H04; H04N; H04N19/00; H04N19/10; H04N19/134; H04N19/146; H04N19/152; H04N21/00; H04N21/40; H04N21/41; H04N21/426; H04N21/42646; H04N21/43; H04N21/432; H04N21/4325; H04N21/44; H04N21/44004; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N5/9261; H04N5/9264; H04N5/93; H04N5/937; G11B2020/1062; G11B2020/10629; G11B2020/10666; H04N19/50; H04N5/84; H04N5/85
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
95 words
A digital data reproducing apparatus for reproducing digital data recorded in tracks on a disk (16) comprising: pickup means (41) for picking up said digital data from said disk (16); first storage means (45) for storing therein a predetermined portion of said digital data picked up by said pickup means (41); decoding means (31) for decoding said digital data read out from said first storage means; and jump controlling means (47) for causing said pickup means to perform track jumping in accordance with an amount of said digital data stored in said first storage means.
Claim 2
Dependent Claim
16 words
A digital data reproducing apparatus according to claim 1, wherein said digital data include video data.
Claim 3
Dependent Claim
38 words
A digital data reproducing apparatus according to any one of claims 1 and 2, wherein said disk is an optical disk (16) and said pickup means is an optical pickup (41) which makes use of a laser beam.
Claim 4
Dependent Claim
54 words
A digital data reproducing apparatus according to any one of claims 1, 2 and 3, comprising sector detecting means (43) for detecting a sector number from said digital data picked up by said pickup means (41), a write address (WP) of said first storage means (45) being set in accordance with said sector number.
Claim 5
Dependent Claim
76 words
A digital data reproducing apparatus according to any one of the preceding claims, wherein said track jumping is performed from a current reading position (A) to a position (B) on an inner circumference side by one track distance, and said first storage means (45) has a storage capacity at least sufficient to store a predetermined portion of said digital data corresponding to one rotation of said disk (16) at an outermost circumference of said disk (16).
Claim 6
Dependent Claim
24 words
A digital data reproducing apparatus according to any one of the preceding claims, wherein said first storage means is a ring buffer memory (45).
Claim 7
Dependent Claim
37 words
A digital data reproducing apparatus according to any one of the preceding claims, wherein said decoding means (31) includes second storage means (21) for storing therein said digital data read out from said first storage means (45).
Claim 8
Dependent Claim
38 words
A digital data reproducing apparatus according to any one of the preceding claims, wherein said decoding means (31) includes inverse variable length code means (22) for inverse variable length code processing a predetermined portion of said digital data.
Claim 9
Dependent Claim
34 words
A digital data reproducing apparatus according to any one of the preceding claims, wherein said decoding means (31) includes an inverse quantizing circuit (23) for inversely quantizing a predetermined portion of said digital data.
Claim 10
Dependent Claim
38 words
A digital data reproducing apparatus according to any one of the preceding claims, wherein said decoding means (31) includes inverse discrete cosine transform means (24) for inverse discrete cosine transform processing a predetermined portion of said digital data.
Claim 11
Dependent Claim
41 words
A digital data reproducing apparatus according to any one of the preceding claims, wherein said decoding means includes movement compensating means (26) for performing movement compensation in accordance with movement vector information included in a predetermined portion of said digital data.
Claim 12
Dependent Claim
40 words
A digital data reproducing apparatus according to claim 7, wherein maximum average transfer rate (Rm) to said first storage means (45) is higher than maximum transfer rate (Rc) from said first storage means (45) to said second storage means (21).
Claim 13
Dependent Claim
127 words
A digital data reproducing apparatus for reproducing digital data recorded in tracks on a disk (16) comprising: pickup means (41) for picking up said digital data from said disk (16); error detecting means (43,44) for detecting an error in said digital data picked up by said pickup means (41) and outputting an error occurrence signal; first storage means (45) for storing therein a predetermined portion of said digital data picked up by said pickup means (41); decoding means (31) for decoding said digital data read out from said first storage means (45); and jump controlling means (47) for causing said pickup means to perform track jumping in accordance with said error occurrence signal and an amount of said digital data stored in said first storage means (45).
Claim 14
Dependent Claim
57 words
A digital data reproducing apparatus according to claim 13, wherein said error detecting means (43,44) includes sector detecting means (43) for detecting a sector number from said digital data picked up by said pickup means (41) and outputting, when the sector number is not detected regularly, said output error occurrence signal to said jump controlling means (47).
Claim 15
Dependent Claim
60 words
A digital data reproducing apparatus according to any one of claims 13 and 14, wherein said error detecting means (43,44) incudes means (44) for detecting and correcting an error of said digital data picked up by said pickup means (41) and outputting, when data which cannot be corrected are found, said error occurrence signal to said jump controlling means (47).
Claim 16
Dependent Claim
22 words
A digital data reproducing apparatus according to any one of claims 13, 14 and 15, wherein said digital data include video data.
Claim 17
Dependent Claim
38 words
A digital data reproducing apparatus according to any one of claims 13 to 16, wherein the disk is an optical disk (16), and said pickup means is an optical pickup (41) which makes use of a laser beam.
Claim 18
Dependent Claim
77 words
A digital data reproducing apparatus according to any one of claims 13 to 17, wherein said track jumping is performed from a current reading position (A) to a position (B) on an inner circumference side by one track distance, and said first storage means (45) has a storage capacity at least sufficient to store a predetermined portion of said digital data corresponding to one rotation of the disk (16) at an outermost circumference of the disk (16).
Claim 19
Dependent Claim
25 words
A digital data reproducing apparatus according to any one of claims 13 to 18, wherein said first storage means is a ring buffer memory (45).
Claim 20
Dependent Claim
38 words
A digital data reproducing apparatus according to any one of claims 13 to 19, wherein said decoding means (31) includes second storage means (21) for storing therein said digital data read out from said first storage means (45).
Claim 21
Dependent Claim
39 words
A digital data reproducing apparatus according to any one of claims 13 to 20, wherein said decoding means (31) includes inverse variable length code means (22) for inverse variable length code processing a predetermined portion of said digital data.
Claim 22
Dependent Claim
35 words
A digital data reproducing apparatus according to any one of claims 13 to 21, wherein said decoding means (31) includes an inverse quantizing circuit (23) for inversely quantizing a predetermined portion of said digital data.
Claim 23
Dependent Claim
39 words
A digital data reproducing apparatus according to any one of claims 13 to 22, wherein said decoding means (31) includes inverse discrete cosine transform means (24) for inverse discrete cosine transform processing a predetermined portion of said digital data.
Claim 24
Dependent Claim
43 words
A digital data reproducing apparatus according to any one of claims 13 to 23, wherein said decoding means (31) includes movement compensating means (26) for performing movement compensation in accordance with movement vector information included in a predetermined portion of said digital data.
Claim 25
Dependent Claim
28 words
A digital data reproducing apparatus according to claim 14, wherein the write address (WP) of said first storage means (45) is set in accordance with said sector number.
Claim 26
Dependent Claim
42 words
A digital data reproducing apparatus according to claim 20, wherein the maximum average transfer rate (Rm) to said first storage means (45) is higher than the maximum transfer rate (Rc) from said first storage means (45) to said second storage means (21).
Claim 27
Dependent Claim
129 words
A digital data reproducing apparatus for reproducing digital data recorded in tracks on a disk (16), comprising: pickup means (41) for picking up said digital data from said disk (16); error detecting means (43,44) for detecting an error in said digital data picked up by said pickup means (41) and outputting an error occurrence signal; storage means (45) for storing a predetermined portion of said digital data therein, said storage means (45) having a storage capacity greater than twice the amount of data recoverable from an outermost circumferential track of said disk (16); decoding means (31) for decoding said digital data read out from said storage means; and jump controlling means (47) for causing said pickup means (41) to perform track jumping in accordance with said error occurrence signal.
Claim 28
Dependent Claim
96 words
A digital data reproducing method for reproducing digital data recorded in tracks on a disk (16), comprising the steps of: picking up said digital data from the disk (16); writing said digital data into a first memory (45) at a transfer rate within a first predetermined range; reading out said digital data stored in said first memory (45) at a transfer rate lower than the first predetermined range; storing said digital data read out from said first memory (45) into a second memory (21); and reading out said digital data stored in said second memory (21).
Claim 29
Dependent Claim
36 words
A digital data reproducing method according to claim 28, comprising the step of temporarily stopping writing of said digital data into said first memory (45) in response to a storage capacity of said first memory (45).
Claim 30
Dependent Claim
64 words
A digital data reproducing method according to any one of claims 28 and 29, comprising the steps of: detecting an error in said digital data picked up from the disk (16); outputting an error occurrence signal in accordance with the detection of an error; and temporarily stopping writing of said digital data into said first memory (45) in accordance with said error occurrence signal.
Claim 31
Dependent Claim
34 words
A digital data reproducing method according to any one of claims 28, 29 and 30, comprising the step of inverse variable length code processing said digital data read out from said second memory (21).
Claim 32
Dependent Claim
30 words
A digital data reproducing method according to any one of claims 28 to 31, comprising the step of inversely quantizing said digital data read out from said second memory (21).
Claim 33
Dependent Claim
33 words
A digital data reproducing method according to any one of claims 28 to 32, comprising the step of inverse discrete cosine transform processing said digital data read out from said second memory (21).
Claim 34
Dependent Claim
32 words
A digital data reproducing method according to any one of claims 18 to 33, comprising the step of performing movement compensation of said digital data read out from said second memory (21).
Claim 35
Dependent Claim
38 words
A digital data reproducing method according to claim 29 or claim 30, wherein said stopping step includes the step of causing a pickup (41) for picking up said digital data from said disk (16) to perform track jumping.
Claim 36
Dependent Claim
28 words
A digital data reproducing method according to claim 30, wherein the step of detecting an error includes the step of detecting a sector number from said digital data.
Claim 37
Dependent Claim
31 words
A digital data reproducing method according to claim 30, wherein the step of detecting an error incudes the step of detecting an error in said digital data and correcting the same.
References Cited (Backward Citations)
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