EP0727911A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus and method for decoding data
Assignee: Sony Corp
•
Filing: 1996-02-09
•
Granted: —
•
Expires: 2016-02-09
Abstract
Abstract Data decoding apparatus decodes data reproduced from a record medium (1) and stored in a memory (7). Since decoding requires a sufficient amount of data to be stored in memory, especially when the data is, for example, predictively encoded, a system controller (21) inhibits previously read data from being overwritten in the memory (7). Thus, when a reverse reproduction operation is suddenly initiated during a forward reproduction operation, a sufficient amount of data is reserved in the memory (7) for decoding the data in the reverse direction. Similarly, the system controller (21) inhibits the memory (7) from writing over previously read data during reverse reproduction and a sufficient amount of data is reserved for decoding when forward reproduction is resumed. <IMAGE>
Inventors
- 👤 Hajime C/O Int. Prop. Dep. Sony Corp. Nitta
- 👤 Kiyoshi C/O Int. Prop. Dep. Sony Corp. Ota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 16:49
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/87; H04N9/877; G; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; G11B2020/1062; G11B2020/10629; G11B2020/10666; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/783; H04N5/84; H04N5/85; H04N9/80; H04N9/804; H04N9/8042
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
An apparatus for decoding data reproduced from a record medium comprising: memory means for storing said data reproduced from the record medium; first control means for causing said data reproduced from the record medium to be written into and read from said memory means; decoding means for decoding data read from said memory means; and second control means for inhibiting the first control means from overwriting data previously read from said memory means.
Claim 2
Dependent Claim
29 words
The apparatus for decoding data according to claim 1 wherein said data reproduced from the record medium is picture-frame data recorded on the record medium in groups of picture-frames.
Claim 3
Dependent Claim
64 words
The apparatus for decoding data according to claim 2 wherein the second control means comprises: write-inhibit pointer means for storing a memory address demarking the beginning of picture-frame data of a group of pictures currently being read from the memory means, such that the second control means inhibits said first control means from writing beyond the memory address indicated by the write-inhibit pointer means.
Claim 4
Dependent Claim
61 words
The apparatus for decoding data of claim 3, wherein the first control means comprises: read pointer means for incrementing a memory address of picture-frame data currently being read from the memory means; and write pointer means for incrementing a memory address of picture-frame data reproduced from said record medium currently being written over picture-frame data previously read from said memory means.
Claim 5
Dependent Claim
17 words
The apparatus for decoding data of claim 4, wherein the memory means is a ring buffer memory.
Claim 6
Independent Claim
117 words
An apparatus for decoding predictively-encoded picture-frame data recorded on a record medium from groups of pictures comprising: reproducing means for reproducing said picture-frame data from said record medium; memory means for storing said picture-frame data of said groups of pictures reproduced from said record medium; decoding means for decoding said picture-frame data by predictive-decoding; first control means for causing said memory means to output said picture-frame data to said decoding means and for causing said memory means to store picture-frame data in portions of said memory means occupied by previously read data; and second control means for inhibiting said picture-frame data from overwriting data of a respective group of pictures currently being read from said memory means.
Claim 7
Dependent Claim
62 words
The apparatus for decoding of claim 6, wherein the second control means comprises: write-inhibit pointer means for storing a memory address demarking the beginning of data of said respective group of pictures currently being read from the memory means, such that the second control means inhibits said first control means from writing beyond the memory address indicated by the write-inhibit pointer means.
Claim 8
Dependent Claim
60 words
The apparatus for decoding of claim 7, wherein the first control means comprises: read pointer means for incrementing a memory address of picture-frame data currently being read from the memory means; and write pointer means for incrementing a memory address of picture-frame data reproduced from said record medium currently being written over picture-frame data previously read from said memory means.
Claim 9
Dependent Claim
16 words
The apparatus for decoding of claim 8, wherein the memory means is a ring buffer memory.
Claim 10
Independent Claim
93 words
A method for decoding predictively-encoded picture-frame data recorded on a record medium from groups of pictures comprising the steps of: reproducing the picture-frame data from said record medium; writing said picture-frame data of said groups of pictures reproduced from said record medium in a memory; reading said picture-frame data written to said memory in response to a request from a decoder; decoding said picture-frame data read from said memory; and inhibiting the memory from writing over data reproduced from a respective group of pictures currently being read as picture-frame data from said memory.
Claim 11
Dependent Claim
59 words
The method for decoding according to claim 10, further comprising the steps of: incrementing a read pointer to an address in said memory pointing to picture-frame data currently being read from said memory in forward reproduction; and incrementing a write pointer pointing to an address in said memory where picture-frame data is to be written in said forward reproduction.
Claim 12
Dependent Claim
78 words
The method for decoding according to claim 11, wherein the step of inhibiting comprises advancing a write-inhibit pointer to an address in said memory pointing to a beginning of said respective group of pictures currently being read as picture-frame data from said memory in said forward reproduction; and preventing picture-frame data from overwriting the data of said respective group of pictures currently being read by inhibiting the write pointer from advancing beyond the write-inhibit pointer in said memory.
Claim 13
Dependent Claim
41 words
The method for decoding according to claim 12, further comprising the step of: repositioning the write pointer to an end of the respective group of pictures currently being read from said memory as picture-frame data when a reverse reproduction is initiated.
Claim 14
Dependent Claim
37 words
The method for decoding according to claim 13, further comprising the step of: positioning the read pointer to an address in said memory pointing to picture-frame data currently being read from said memory in said reverse reproduction.
Claim 15
Dependent Claim
27 words
The method for decoding according to claim 14, further comprising the step of: inhibiting the write pointer from advancing beyond the write-inhibit pointer in said reverse reproduction.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.