Patent EP0248536A2 successfully refreshed from Google Patents.
EP0248536A2
Expired / Lapsed
EP
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Methods of and apparatus for seeking a target address on a record medium
Assignee: Sony Corp
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Filing: 1987-05-05
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Granted: —
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Expires: 2007-05-05
Abstract
Abstract A method of and an apparatus for seeking a target address having an appended error check code are disclosed. When seeking a target address on a record medium (1) on which the recorded data are divided into a plurality of blocks in correlation with an address for each block and an error check code for each address, the error check code to be appended to the address is formed from the target address. The target address and the error check code derived from the target address are compared with the address having the error check code reproduced from the record medium (1). When the result of such comparison has revealed that the error is within the symbol or bit number that can be corrected by the error check code, the address read from the record medium (1) is determined to be the target address.
Inventors
- 👤 Tamotsu C/O Patents Division Yamagami
- 👤 Yoichiro C/O Patents Division Sako
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 07:32
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/085; G11B7/08505; G11B27/00; G11B27/10; G11B20/00; G11B20/10; G11B20/18; G11B20/1803; G11B20/1806; G11B20/1813; G11B21/00; G11B21/02; G11B21/08; G11B21/081; G11B21/083; G11B27/102; G11B27/105; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B2020/10916; G11B2220/00; G11B2220/17; G11B2220/20; G11B2220/25; G11B2220/2525; G11B2220/2537
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
155 words
1 . A method of seeking a target address on a record medium (1) on which has been recorded data divided into a plurality of blocks in correlation with an address for each block and an error check code for each address; said method being characterized by the steps of: (a) forming from a supplied target address an error check code to be appended to said target address; . ( b ) reading data recorded on said record medium (1), and extracting the address therefor with the corresponding error check code; (c) comparing said target address and the error check code formed therefrom with said extracted address and corresponding error check code; and (d) repeating steps (b) and (c) until the comparison in step (c) indicates that the error between the target address and the extracted address is less than a predetermined number and then designating the currently extracted address to be the target address.
Claim 2
Dependent Claim
155 words
1 . A method of seeking a target address on a record medium (1) on which has been recorded data divided into a plurality of blocks in correlation with an address for each block and an error check code for each address; said method being characterized by the steps of: (a) forming from a supplied target address an error check code to be appended to said target address; . ( b ) reading data recorded on said record medium (1), and extracting the address therefor with the corresponding error check code; (c) comparing said target address and the error check code formed therefrom with said extracted address and corresponding error check code; and (d) repeating steps (b) and (c) until the comparison in step (c) indicates that the error between the target address and the extracted address is less than a predetermined number and then designating the currently extracted address to be the target address.
Claim 3
Dependent Claim
22 words
2 . A method according to claim 1 wherein in step (b) the data is read optically from said record medium (1).
Claim 4
Dependent Claim
15 words
A method according to claim 1 wherein said error check code is a Bose-Chaudhuri-Hoquehem code.
Claim 5
Dependent Claim
18 words
4 . A method according to claim 1 wherein said error check code is a Reed Solomon code.
Claim 6
Independent Claim
27 words
A method according to any one of the preceding claims wherein said predetermined number is the number of bits which are correctable by the error check code.
Claim 7
Independent Claim
160 words
A method of seeking a target address on a record medium (1) on which are recorded data divided into a plurality of blocks in correlation with an address for each block and an error check code for each address, said method comprising the steps of: (a) reproducing the signals recorded on said record medium (1) and extracting the addresses from the reproduced signals; and (b) computing a target address based on the extracted address; characterized by the further steps of: (c) forming from the computed target address an error check code to be appended to said target address; (d) comparing said target address and error check code with the extracted, reproduced address and error check code therefor; and (e) repeating steps (a) to (d) until the comparison in step (d) indicates that the error between the target address and the extracted address is less than a predetermined number and then designating the currently extracted address to be the target address.
Claim 8
Independent Claim
160 words
A method of seeking a target address on a record medium (1) on which are recorded data divided into a plurality of blocks in correlation with an address for each block and an error check code for each address, said method comprising the steps of: (a) reproducing the signals recorded on said record medium (1) and extracting the addresses from the reproduced signals; and (b) computing a target address based on the extracted address; characterized by the further steps of: (c) forming from the computed target address an error check code to be appended to said target address; (d) comparing said target address and error check code with the extracted, reproduced address and error check code therefor; and (e) repeating steps (a) to (d) until the comparison in step (d) indicates that the error between the target address and the extracted address is less than a predetermined number and then designating the currently extracted address to be the target address.
Claim 9
Dependent Claim
24 words
A method according to claim 6 wherein in said signal reproducing step the signals are read optically from said record medium ( 1 ).
Claim 10
Dependent Claim
32 words
A method according to claim 6 or claim 7 wherein said predetermined number in the comparison step is equal to or less than the error correction capability of said error check code.
Claim 11
Dependent Claim
78 words
9, A method according to any one of the preceding claims wherein said data blocks are recorded on said record medium (1) along with corresponding addresses and error check codes recorded a multiple number (n) of times for each block, and further wherein in said comparing step at least a number k of said extracted, multiple recorded addresses and error codes, where k is less than n, are compared with said target address and error check code therefor.
Claim 12
Dependent Claim
155 words
A target address seeking apparatus for use with a signal reproducing means (2) for reproducing signals recorded on a record medium (1) on which recorded data are divided into a plurality of blocks in correlation with an address for each block and an error check code for each address: said target address seeking apparatus being characterized by: (a) means (7) for forming from a supplied target address an error check code to be appended to said target address; (b) means (3) for extracting an address having an error check code from the output signals of said signal reproducing means; (c) means (5) for comparing said target address and the error check code formed from said target address with said extracted address and said extracted error check code; and (d) means (11) for controlling the operation of said signal reproducing means (2) on the basis of the results of the comparison by said comparing means (5).
Claim 13
Dependent Claim
155 words
A target address seeking apparatus for use with a signal reproducing means (2) for reproducing signals recorded on a record medium (1) on which recorded data are divided into a plurality of blocks in correlation with an address for each block and an error check code for each address: said target address seeking apparatus being characterized by: (a) means (7) for forming from a supplied target address an error check code to be appended to said target address; (b) means (3) for extracting an address having an error check code from the output signals of said signal reproducing means; (c) means (5) for comparing said target address and the error check code formed from said target address with said extracted address and said extracted error check code; and (d) means (11) for controlling the operation of said signal reproducing means (2) on the basis of the results of the comparison by said comparing means (5).
Claim 14
Dependent Claim
165 words
A target address seeking apparatus for use with a signal reproducing means (2) for reproducing signals recorded on a record medium (1) on which recorded data are divided into a plurality of blocks in correlation with an address.for each block and an error check code for each address; said target address seeking apparatus comprising: (a) means (3, 26) for extracting the recorded addresses and error codes from the output signals of said signal reproducing means (2); and (b) means (14) for computing a target address based on the extracted address; characterized by: (c) means (7) for forming from the computed target address an error check code to be appended to said computed target address; (d) means (5) for comparing said computed target address and the error check code therefor with the extracted address and the error check code therefor; and (e) means (11) for controlling the operation of said signal reproducing means (2) based on the results of the comparison by said comparison means (5).
Claim 15
Dependent Claim
165 words
A target address seeking apparatus for use with a signal reproducing means (2) for reproducing signals recorded on a record medium (1) on which recorded data are divided into a plurality of blocks in correlation with an address.for each block and an error check code for each address; said target address seeking apparatus comprising: (a) means (3, 26) for extracting the recorded addresses and error codes from the output signals of said signal reproducing means (2); and (b) means (14) for computing a target address based on the extracted address; characterized by: (c) means (7) for forming from the computed target address an error check code to be appended to said computed target address; (d) means (5) for comparing said computed target address and the error check code therefor with the extracted address and the error check code therefor; and (e) means (11) for controlling the operation of said signal reproducing means (2) based on the results of the comparison by said comparison means (5).
Claim 16
Dependent Claim
70 words
1 2. An apparatus according to claim 10 or claim 11 wherein said comparing means (5) generates an accessing drive signal for driving said signal reproducing means (2) and supplies it to said controlling means (11) to seek the next address when the comparing means (5) determines that the difference between said target address and the error check code derived therefor exceeds the error correction capability of said error code.
Claim 17
Dependent Claim
72 words
13 . An apparatus according to claim 10, claim 11 or claim 12 wherein said data blocks are recorded on said record medium (1) along with corresponding addresses and error check codes recorded a multiple number (n) times for each block, and further wherein said comparing means (5) performs said comparison for at least a number k of said extracted, multiple recorded addresses and error codes where k is less than n.
References Cited (Backward Citations)
No citation records indexed.
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