US5057945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal recording/reproducing apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1990-05-31
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Granted: 1991-10-15
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Expires: 2010-05-31
Abstract
Abstract A signal recording/reproducing apparatus equipped with a recording head section for recording signals on a recording medium and a reproducing head section for reproducing the signals recorded on the recording medium. The recording head section is arranged to record the signal to form N recording sub-tracks on the recording medium and the reproducing head section has M reproducing sub-heads which trace the N recording sub-tracks to reproduce the recording signal. The pitch of the M sub-heads thereof is equal to a pitch of the recording sub-tracks and the number M of the sub-heads is greater than the number N of the recording sub-tracks. The reproducing head section is coupled to a reproduction signal detecting section which is turn eliminates the interference and the crosstalk between adjacent tracks from the reproduced signal due to the reproducing head section. This arrangement allows narrowing the track pitch to increase the recording capacity and extremely improving the transfer rate concurrently with the elimination of the interference between the adjacent codes and crosstalk between the adjacent tracks.
Inventors
- 👤 Toshiyuki Shimada
- 👤 Kazuhiro Aoki
- 👤 Akira Kurahashi
- 👤 Noboru Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:03
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; G11B20/00; G11B20/10; G11B20/22; G11B21/00; G11B21/003; G11B5/012; G11B5/48; G11B5/488; G11B5/4886
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
115 words
A signal recording/reproducing apparatus comprising: a recording head section having recording sub-heads for recording signals inputted from an external circuit to simultaneously form a recording track comprising recording sub-tracks, whose number is N, on a recording medium; a reproducing head section for simultaneously tracing, for reproduction, said recording sub-tracks formed on said recording medium, said reproducing head section having reproducing sub-heads whose number is M and whose pitch is equal to a pitch of said recording sub-tracks, the number M of said reproducing sub-heads being greater than the number N of said recording sub-tracks; and a reproduction signal detecting section for detecting the recorded signals from the reproduced signals due to said M reproducing sub-heads.
Claim 2
Dependent Claim
115 words
A signal recording/reproducing apparatus comprising: a recording head section having recording sub-heads for recording signals inputted from an external circuit to simultaneously form a recording track comprising recording sub-tracks, whose number is N, on a recording medium; a reproducing head section for simultaneously tracing, for reproduction, said recording sub-tracks formed on said recording medium, said reproducing head section having reproducing sub-heads whose number is M and whose pitch is equal to a pitch of said recording sub-tracks, the number M of said reproducing sub-heads being greater than the number N of said recording sub-tracks; and a reproduction signal detecting section for detecting the recorded signals from the reproduced signals due to said M reproducing sub-heads.
Claim 3
Dependent Claim
55 words
A signal recording/reproducing apparatus as claimed in claim 1, further comprising a head control section for controlling said recording head section and said reproducing head section on the basis of the output signal of said reproduction signal detecting section so that the tracing direction is substantially coincident with a longitudinal direction of said recording track.
Claim 4
Dependent Claim
176 words
A signal recording/reproducing apparatus as claimed in claim 1, wherein said reproduction signal detecting section includes: M-channel reproducing amplifiers coupled to said reproducing head section for amplifying the reproduced signals corresponding to said N sub-tracks on said recording medium; analog switch means for time-division-multiplexing the outputs of said M-channel reproducing amplifiers analog-to-digital converter means for sampling and quantifying the output of said analog switch means; equalizer means for performing an equalization of the output of said analog-to-digital converter means with a same characteristic; crosstalk detector means for detecting control signal levels on the basis of M reproduction signals outputted from one of the output of said analog-to-digital converter means and the output of said equalizer means so as to calculate a crosstalk amount on the basis of the detected control signal levels and to output a crosstalk level signal indicative of the calculated crosstalk amount; and crosstalk canceller means for separately deriving the reproduced sub-track signals from the output of said equalizer means in accordance with the crosstalk level signal outputted from said crosstalk detector means.
Claim 5
Dependent Claim
141 words
A signal recording/reproducing apparatus as claimed in claim 1, wherein said reproduction signal detecting section includes: M-channel reproducing amplifiers coupled to said reproducing head section for amplifying the reproduced signals corresponding to said N sub-tracks on said recording medium; analog switch means for time-division-multiplexing the outputs of said M-channel reproducing amplifiers; analog-to-digital converter means for sampling and quantifying the output of said analog switch means; crosstalk canceller means for separately deriving the reproduced sub-track signals from the output of said equalizer means in accordance with a crosstalk level signal; crosstalk detector means for detecting a crosstalk level on the basis of the output signal of said crosstalk canceller means; and accumulator means for low-frequency-filtering and accumulating the output of said crosstalk detector means so as to produce said crosstalk level signal which is in turn supplied to said crosstalk canceller means.
Claim 6
Dependent Claim
63 words
A signal recording/reproducing apparatus as claimed in claim 4, further comprising equalizer means provided between said analog-to-digital converter means and said crosstalk canceller means for performing an equalization of the output of said analog-to-digital converter means with a same characteristic, said crosstalk canceller means deriving the reproduced sub-track signal from the output of said equalizer means in accordance with the crosstalk level signal.
Claim 7
Dependent Claim
62 words
A signal recording/reproducing apparatus as claimed in claim 1, wherein said recording head section is arranged to form a recording format in which there are no guard bands or narrow guard bands whose widths are smaller than those of sub-tracks between the formed recording sub-tracks and there are guard bands whose widths are greater than those of sub-tracks between the formed tracks.
Claim 8
Dependent Claim
28 words
A signal recording/reproducing apparatus as claimed in claim 6, wherein a signal for detection of said crosstalk level is recorded in at least one of said recording sub-tracks.
Claim 9
Dependent Claim
41 words
A signal recording/reproducing apparatus as claimed in claim 1, wherein said recording head section, said reproducing head section and said reproduction signal detecting section function, in combination, for reducing crosstalk, increasing data transfer rate and increasing recording capacity of the medium.
Claim 10
Dependent Claim
146 words
A signal recording/reproducing apparatus arranged to increase the recording capacity of a recording medium, eliminate crosstalk between adjacent tracks on said recording medium and improve the transfer rate, said signal recording/reproducing apparatus comprising: a recording head section having recording sub-heads for recording signals inputted from an external circuit to simultaneously form a recording track comprising recording sub-tracks, whose number is N, on said recording medium; a reproducing head section for simultaneously tracing, for reproduction, said recording sub-tracks formed on said recording medium, said reproducing head section having reproducing sub-heads whose number is K and whose pitch is equal to 1/2 of a pitch of said recording sub-tracks, the number K of said reproducing sub-heads being greater than twice the number N of said recording sub-tracks; and a reproduction signal detecting section for detecting the recorded signals from the reproduced signals due to said K reproducing sub-heads.
Claim 11
Dependent Claim
146 words
A signal recording/reproducing apparatus arranged to increase the recording capacity of a recording medium, eliminate crosstalk between adjacent tracks on said recording medium and improve the transfer rate, said signal recording/reproducing apparatus comprising: a recording head section having recording sub-heads for recording signals inputted from an external circuit to simultaneously form a recording track comprising recording sub-tracks, whose number is N, on said recording medium; a reproducing head section for simultaneously tracing, for reproduction, said recording sub-tracks formed on said recording medium, said reproducing head section having reproducing sub-heads whose number is K and whose pitch is equal to 1/2 of a pitch of said recording sub-tracks, the number K of said reproducing sub-heads being greater than twice the number N of said recording sub-tracks; and a reproduction signal detecting section for detecting the recorded signals from the reproduced signals due to said K reproducing sub-heads.
Claim 12
Dependent Claim
55 words
A signal recording/reproducing apparatus as claimed in claim 9, further comprising a head control section for controlling said recording head section and said reproducing head section on the basis of the output signal of said reproduction signal detecting section so that the tracing direction is substantially coincident with a longitudinal direction of said recording track.
Claim 13
Dependent Claim
176 words
A signal recording/reproducing apparatus as claimed in claim 8, wherein said reproduction signal detecting section includes: K-channel reproducing amplifiers coupled to said reproducing head section for amplifying the reproduced signals corresponding to said N sub-tracks on said recording medium; analog switch means for time-division-multiplexing the outputs of said K-channel reproducing amplifiers analog-to-digital converter means for sampling and quantifying the output of said analog switch means; equalizer means for performing an equalization of the output of said analog-to-digital converter means with a same characteristic; crosstalk detector means for detecting control signal levels on the basis of M reproduction signals outputted from one of the output of said analog-to-digital converter means and the output of said equalizer means so as to calculate a crosstalk amount on the basis of the detected control signal levels and to output a crosstalk level signal indicative of the calculated crosstalk amount; and crosstalk canceller means for separately deriving the reproduced sub-track signals from the output of said equalizer means in accordance with the crosstalk level signal outputted from said crosstalk detector means.
Claim 14
Dependent Claim
62 words
A signal recording/reproducing apparatus as claimed in claim 9, wherein said recording head section is arranged to form a recording format in which there are no guard bands or narrow guard bands whose widths are smaller than those of sub-tracks between the formed recording sub-tracks and there are guard bands whose widths are greater than those of sub-tracks between the formed tracks.
Claim 15
Dependent Claim
28 words
A signal recording/reproducing apparatus as claimed in claim 12, wherein a signal for detection of said crosstalk level is recorded in at least one of said recording sub-tracks.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |