US4864433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and reproducing device
Assignee: Pioneer Corp
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Filing: 1987-12-28
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Granted: 1989-09-05
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Expires: 2007-12-28
Abstract
Abstract In a magnetic recording and reproducing circuit, a PLL circuit extracts a clock signal from the input signal while a clock generating circuit outputs a clock signal independently of the input signal, and one of the clock signals thus obtained is applied to a signal processing circuit depending on whether or not the PLL is in a locked state. When the PLL circuit is not in a locked state, the independently generated clock signal is used, and the processing circuit outputs data substantially at zero level, whereby the recording of noises on the magnetic tape is prevented.
Inventors
- 👤 Shin-ichi Wakumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:11
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; G11B20/00; G11B20/10; G11B20/14; G11B20/1403
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
A magnetic recording and reproducing device for extracting data from an input signal and providing said data as a recording output signal for recording, said device comprising: clock signal extraction means for extracting a first clock signal from said input signal; data extracting means for extracting data from said input signal; clock generating means for generating a second clock signal independently of said input signal; detecting means for detecting when said first clock signal is accurately generated; switch means responsive to an output of said detecting means for selecting one of said first and second clock signals; and signal processing means for providing data other than said extracted data as said recording output signal when said second clock signal is selected.
Claim 2
Dependent Claim
121 words
A magnetic recording and reproducing device for extracting data from an input signal and providing said data as a recording output signal for recording, said device comprising: clock signal extraction means for extracting a first clock signal from said input signal; data extracting means for extracting data from said input signal; clock generating means for generating a second clock signal independently of said input signal; detecting means for detecting when said first clock signal is accurately generated; switch means responsive to an output of said detecting means for selecting one of said first and second clock signals; and signal processing means for providing data other than said extracted data as said recording output signal when said second clock signal is selected.
Claim 3
Dependent Claim
30 words
A magnetic recording and reproducing device as claimed in claim 1, wherein said data extracting means extracts said data from said input signal in accordance with said first clock signal.
Claim 4
Dependent Claim
28 words
A magnetic recording and reproducing device as claimed in claim 1, wherein said detecting means detects whether or not said first clock is synchronized to said input signal.
Claim 5
Dependent Claim
41 words
A magnetic recording and reproducing device as claimed in claim 3, wherein said clock signal extracting means comprises a phase lock loop (PLL) and wherein said detecting means detects whether or not said PLL is phase locked to said input signal.
Claim 6
Dependent Claim
33 words
A magnetic recording and reproducing device as claimed in claim 1, wherein said signal processing means provides substantially zero level data as said recording output signal when said second clock signal is selected.
Claim 7
Dependent Claim
33 words
A magnetic recording and reproducing device as claimed in claim 1, further comprising means for interrupting a recording operation when said detecting means detects that said first clock signal is not accurately generated.
Claim 8
Dependent Claim
28 words
A magnetic recording and reproducing device as claimed in claim 1, further comprising display means for providing a display in accordance with the output of said detecting means.
Claim 9
Dependent Claim
86 words
A magnetic recording and reproducing device for extracting data from an input signal and providing said data as a recording output signal for recording, said device comprising: clock signal extraction means for extracting a clock signal from said input signal; data extracting means for extracting data from said input signal; detecting means for detecting when said clock signal is accurately generated; and signal processing means for providing data other than said extracted data as said recording output signal when said clock signal is not accurately generated.
Claim 10
Dependent Claim
86 words
A magnetic recording and reproducing device for extracting data from an input signal and providing said data as a recording output signal for recording, said device comprising: clock signal extraction means for extracting a clock signal from said input signal; data extracting means for extracting data from said input signal; detecting means for detecting when said clock signal is accurately generated; and signal processing means for providing data other than said extracted data as said recording output signal when said clock signal is not accurately generated.
References Cited (Backward Citations)
US4040022A
Cited
US4785361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |