EP0343930A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Data signal processing apparatus
Assignee: Sony Corp
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Filing: 1989-05-23
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Granted: —
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Expires: 2009-05-23
Abstract
Abstract Apparatus for processing an input data signal includes a generator (64) providing a plurality of pseudo-random signals each of which scrambles the input data signal in one of a plurality of mod. 2-adders (62a to 62d) to provide a plurality of respective scrambled outputs, a detector (65) in which a DC component, such as a run-length or a digital sum value, is detected for each of the scrambled outputs, and a selector (67) responsive to the detector (65) for selecting the one of the scrambled outputs, for example having a minimum run-length or a digital sum value closest to zero. An identifying signal identifying the pseudo-random signal used in scrambling the selected scrambled output is then transmitted with the latter, for example, by recording on a magnetic tape. When the transmitted signal is received or reproduced, the identifying signal included therein is detected, and the received signal is descrambled with a pseudo-random signal corresponding to the detected identifying signal.
Inventors
- 👤 Keiji Kanota
- 👤 Michio Nagai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 04:22
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10009; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
149 words
Apparatus for processing an input data signal, the apparatus comprising: generator means (64) for generating a plurality of pseudo-random signals; scramble means (62a to 62d) for scrambling the input data signal by each of said plurality of pseudo-random signals and thereby providing a plurality of respective outputs; detector means (65) for detecting variation of a DC component for each of said outputs of said scramble means; selector means (67) for selecting one of said outputs of said scramble means (62a to 62d) under the control of said detector means (65); means (68) for adding to said one output selected by said selector means (67) an identifying signal which identifies the pseudo-random signal used in scrambling said one selected output of the scramble means (62a to 62d); and means (46A, 46B) for transmitting a signal comprising said one output selected by said selector means (67) together with said identifying signal.
Claim 2
Dependent Claim
149 words
Apparatus for processing an input data signal, the apparatus comprising: generator means (64) for generating a plurality of pseudo-random signals; scramble means (62a to 62d) for scrambling the input data signal by each of said plurality of pseudo-random signals and thereby providing a plurality of respective outputs; detector means (65) for detecting variation of a DC component for each of said outputs of said scramble means; selector means (67) for selecting one of said outputs of said scramble means (62a to 62d) under the control of said detector means (65); means (68) for adding to said one output selected by said selector means (67) an identifying signal which identifies the pseudo-random signal used in scrambling said one selected output of the scramble means (62a to 62d); and means (46A, 46B) for transmitting a signal comprising said one output selected by said selector means (67) together with said identifying signal.
Claim 3
Dependent Claim
32 words
Apparatus according to claim 1, wherein said transmitting means includes means (46A) for recording said one output selected by said selector means (67) with said information signal on a magnetic tape (46B).
Claim 4
Dependent Claim
27 words
Apparatus according to claim 1 or claim 2, wherein said detector means includes means for detecting run-lengths of said outputs of said scramble means (62a to 62d).
Claim 5
Dependent Claim
61 words
Apparatus according to claim 1 or claim 2, wherein said detector means includes means (131A to 131D) for detecting digital sum values of said outputs of the scramble means (117A to 117D), and said selector means (132) is operative to select the one of said outputs of the scramble means (117A to 117D) having a digital sum value closest to zero.
Claim 6
Dependent Claim
58 words
Apparatus according to any one of the preceding claims, comprising: receiver means (46C) for receiving a signal transmitted by said transmitting means (46A, 46B); detector means (50) for detecting said identifying signal in the received transmitted signal; and descramble means (147) for descrambling the received signal in accordance with a pseudo-random signal corresponding to the detected identifying signal.
Claim 7
Dependent Claim
33 words
Apparatus according any one of the preceding claims, comprising precoder means (121A to 121D) for encoding each of said outputs of said scramble means (117A to 117D) to have a predetermined frequency characteristic.
Claim 8
Dependent Claim
18 words
Apparatus according to claim 6, wherein said precoder means comprises a partial response encoder means (121A to 121D).
Claim 9
Dependent Claim
81 words
Apparatus according to claim 6, wherein said precoder means includes a plurality of partial response encoders (121A to 121D) each comprising feedback circuit means (123 to 125) having a delay (124, 125) for encoding a respective output of said scramble means (117A to 117D) in accordance with a partial response method, and switching means (123, 126) for providing, as a feedback to one of said partial response encoders (121A to 121D), an output signal of another of said partial response encoders.
References Cited (Backward Citations)
No citation records indexed.
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