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EP0174789A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Methods of and apparatus for reproducing signals
Assignee: Sony Corp
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Filing: 1985-09-02
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Granted: —
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Expires: 2005-09-02
Abstract
Abstract In an apparatus for reproducing signals in a plurality of oblique tracks (5A,5B) on a recording medium (2) by a rotary head (1A,1B), the signals in the tracks (5A,5B) contain a digital information signal in a first predetermined area on the oblique tracks (5A,5B) and a tracking control signal including a tracking pilot signal (P) and an erase signal (E) in a second predetermined area. When the recorded tracks (5A,5B) are reproduced by a rotary playback head (1A,1B) having a tracing width greater than the track width, the pilot signals (P) from the adjacent tracks (5A,5B) will be detected and compared in level. A tracking signal for controlling the tracking alignment of the rotary playback head (1A,1B) is generated in response to the level comparison, and is adjusted in level response to the level of the tracking control signal.
Inventors
- 👤 Hiraku C/O Patents Division Sugiki
- 👤 Makoto C/O Patents Division Yamada
- 👤 Shinji C/O Patents Division Miyamori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 07:37
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/584; G11B15/00; G11B15/18; G11B15/46; G11B15/467; G11B15/4673; G11B15/4675; G11B15/4676; G11B15/4677; G11B21/00; G11B21/02; G11B21/10; G11B21/103
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A method of reproducing signals recorded in a plurality of oblique tracks (5A,5B) on a recording medium (2) by a rotary head (lA,lB), the signals in said tracks (5A,5B) containing a digital information signal in a first predetermined area in said tracks (5A,5B) and a tracking control signal including a tracking pilot signal (P) and an erase signal (E) in a second predetermined area in said tracks (5A,5B), the method being characterised by the steps of: reproducing said tracking pilot signals (P) recorded in said second predetermined area from both tracks (5A,5B) adjacent to said track (5A,5B) being traced; comparing the levels of said tracking pilot signals (P) reproduced from said adjacent tracks (5A,5B); generating a tracking signal in response to said level comparison; controlling the tracking alignment of said rotary head (lA,lB) in response to said tracking signal; detecting the level of said tracking control signal recorded in said second predetermined area; and adjusting the level of said tracking signal in response to said level detection.
Claim 2
Independent Claim
167 words
A method of reproducing signals recorded in a plurality of oblique tracks (5A,5B) on a recording medium (2) by a rotary head (lA,lB), the signals in said tracks (5A,5B) containing a digital information signal in a first predetermined area in said tracks (5A,5B) and a tracking control signal including a tracking pilot signal (P) and an erase signal (E) in a second predetermined area in said tracks (5A,5B), the method being characterised by the steps of: reproducing said tracking pilot signals (P) recorded in said second predetermined area from both tracks (5A,5B) adjacent to said track (5A,5B) being traced; comparing the levels of said tracking pilot signals (P) reproduced from said adjacent tracks (5A,5B); generating a tracking signal in response to said level comparison; controlling the tracking alignment of said rotary head (lA,lB) in response to said tracking signal; detecting the level of said tracking control signal recorded in said second predetermined area; and adjusting the level of said tracking signal in response to said level detection.
Claim 3
Dependent Claim
64 words
A method according to claim 1 wherein said step of detecting the level of said tracking control signal includes the step of holding the peak level of said tracking pilot signal (P), and dividing the held signal by a reference level, and said step of adjusting the level of the tracking signal includes the step of multiplying the dividing signal and the comparing signal.
Claim 4
Dependent Claim
63 words
A method according to claim 1 wherein said step of detecting the level of said tracking control signal includes the step of holding the peak level of said erase signal (E) and dividing the held signal by a reference level, and said step of adjusting the level of the tracking signal includes the step of multiplying the dividing signal and the comparing signal.
Claim 5
Independent Claim
186 words
An apparatus for reproducing signals recorded in a plurality of oblique tracks (5A,5B) on a recording medium (2) by a rotary head (lA,lB), the signals in the tracks (5A,5B) containing a digital signal in a first predetermined area in said tracks (5A,5B) and a tracking control signal including a tracking pilot signal (P) and an erase signal (E) in a second predetermined area in said tracks (5A,5B), the apparatus being characterised by: means (lA,lB) for reproducing the pilot signal (P) recorded in said second predetermined area from both tracks (5A,5B) adjacent to said track (5A,5B) being traced; means (23) for comparing the levels of said tracking pilot signals (P) reproduced from said adjacent tracks (5A,5B); means (24) for generating a tracking signal in response to said comparing means (23); means (13) for controlling a tracking alignment of said rotary head (lA,lB) in response to said tracking signal; means (21,66) for detecting the level of said tracking control signal recorded in said second predetermined area; and means (67) for adjusting the level of the tracking signal in response to a level detected by said detecting means (21,66).
Claim 6
Independent Claim
186 words
An apparatus for reproducing signals recorded in a plurality of oblique tracks (5A,5B) on a recording medium (2) by a rotary head (lA,lB), the signals in the tracks (5A,5B) containing a digital signal in a first predetermined area in said tracks (5A,5B) and a tracking control signal including a tracking pilot signal (P) and an erase signal (E) in a second predetermined area in said tracks (5A,5B), the apparatus being characterised by: means (lA,lB) for reproducing the pilot signal (P) recorded in said second predetermined area from both tracks (5A,5B) adjacent to said track (5A,5B) being traced; means (23) for comparing the levels of said tracking pilot signals (P) reproduced from said adjacent tracks (5A,5B); means (24) for generating a tracking signal in response to said comparing means (23); means (13) for controlling a tracking alignment of said rotary head (lA,lB) in response to said tracking signal; means (21,66) for detecting the level of said tracking control signal recorded in said second predetermined area; and means (67) for adjusting the level of the tracking signal in response to a level detected by said detecting means (21,66).
Claim 7
Dependent Claim
66 words
An apparatus according to claim 4 wherein said means for detecting the level of said tracking control signal includes means (21) for holding the peak level of said pilot signal (P) and means (66) for dividing the held signal by a reference level, and said means for adjusting the level of the tracking signal Includes means (67) for multiplying the dividing signal and the comparing signal.
Claim 8
Dependent Claim
66 words
An apparatus according to claim 4 wherein said means for detecting the level of said tracking control signal includes means (21) for holding the peak level of said erase signal (E) and means (66) for dividing the held signal by a reference level, and said means for adjusting the level of the tracking signal includes means (67) for multiplying the dividing signal and the comparing signal.
References Cited (Backward Citations)
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