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| Number | Title | Issue Date |
| 7733596 | System and method for identifying the signal integrity of a signal from a tape drive A system and method for identifying signal degradation in a tape drive is disclosed in which a data signal read from the tape drive and the signal characteristics of the undecoded portion of the data stream are compared with a set of known values. The undecoded port... | 06/08/2010 |
| 7393066 | Servo systems, servo heads, servo patterns for data storage especially for reading, writing, and recording in magnetic recording tape Methods and systems for data recording and reading for increasing overall tape data storage density, especially for data written in azimuth style. The principles of the invention provide servo formats and systems that allow accurate on track guidance for higher dens... | 07/01/2008 |
| 7391587 | Servo systems, servo heads, servo patterns for data storage especially for reading, writing, and recording in magnetic recording tape Methods and systems for data recording and reading for increasing overall tape data storage density, especially for data written in azimuth style. The principles of the invention provide servo formats and systems that allow accurate on track guidance for higher dens... | 06/24/2008 |
| 7369523 | Data signal demodulation in a communication system A method described evaluates the pilot-to-data power ratio based on the values of the demodulated data at the output of a receiver such as a conventional maximal ratio combiner or an equalizer receiver. Since the data are not scaled to their particular decision grid... | 05/06/2008 |
| 7369748 | Reproducing apparatus and tracking method A reproducing apparatus comprises detecting means 18 and 19 for detecting levels of pilot signals recorded on tracks from reproduced signals reproduced by magnetic heads 1A, 1B, a calculating means 24 for calculating a ratio betwee... | 05/06/2008 |
| 7362954 | Recording apparatus and method, recording medium, and program When the head of a data pack that can be a start point of consecutive recording is included in an ECC (error correcting code) bank, data indicating this is set in an ECCTB (error correctly code two-B picture). When the head of a data pack that can be a start point o... | 04/22/2008 |
| 7355359 | Universal apparatus for driving diverse fans A universal driving apparatus of a computer system, including a receptacle, a power switch, an integrator and a comparator, is provided to identify and drive a first fan and a second fan. The receptacle connects to the first fan or the second fan for electricity sup... | 04/08/2008 |
| 7310291 | Method and apparatus for tracking error detection in optical disk driver A method and apparatus for tracking error detection in an optical disk reproduction system. The tracking error detecting apparatus generates a tracking error signal as a difference signal of optical detection signals generated by more than two optical detectors posi... | 12/18/2007 |
| 7265924 | Servo writer with multiple servo write heads and a method of writing with the servo writer Disclosed is a servo writer in which a servo write head is easy to exchange, and which writes, to magnetic tapes, a servo signal from which a reading signal of the improved SN ratio can be obtained. The servo writer includes a magnetic tape running system, at least ... | 09/04/2007 |
| 7197522 | Bi-quad digital filter configured with a bit binary rate multiplier The invention is directed to a bi-quad filter circuit configured with sigma-delta devices that operate as binary rate multipliers (BRMs). Unlike conventional bi-quad filter circuits, the invention provides a bi-quad filter configured with a single-bit BRM. In anothe... | 03/27/2007 |
| 7158338 | Servo track having periodic frames of tone field and embedded synchronization marks Methods and systems for sensing a position of a transducer head with respect to a storage medium. One method includes generating a read signal from a servo track stored on a magnetic storage medium. The servo track includes servo frames of magnetic flux transitions ... | 01/02/2007 |
| 7154694 | Servo writer Disclosed is a servo writer which forms servo bands on information recording media so as to enable a drive to track the servo bands with great accuracy by using a recording/reproducing head. The servo writer includes a driving mechanism for running a tape-shaped inf... | 12/26/2006 |
| 7139151 | Band identification in time-based servopositioning formats Time-based servopositioning systems, methods, formats, and data recording media used in association with the same, employing bands of signals that differ from each other in the polarity of the servo signal, or the orientation of the servo signal, or the pattern widt... | 11/21/2006 |
| 7126320 | Evaluation of the characteristics of electric pulses A circuit for evaluating characteristics of duration and/or shape of an electric pulse induced in an element of an integrated circuit comprising an assembly of elements, each element being likely to receive an occasional external disturbance generating an electric p... | 10/24/2006 |
| 7123086 | Feed forward amplifier employing positive feedback pilot generation A pilot generation and detection system within a feed forward power amplifier that uses positive feedback to create a narrow bandwidth limit cycle is disclosed. The pilot system adjusts its frequency automatically to keep a desirable phase relationship between the p... | 10/17/2006 |
| 7106535 | Method and apparatus for maintaining consistent track pitch in helical scan recorder New helical recording scanner architectures and transducing methods provide a consistent track pitch for helical tracks despite positional errors in placement of transducing elements (or sets of transducing elements) from their nominal positioning. The new scanners ... | 09/12/2006 |
| 7046479 | Magnetic recording/reproducing device having position control Track thinning at an IN point of consecutive recording is prevented by doing a head-track one-edge coincidence tracking by using a head of a larger width than the track width. ATF control unit (15) makes a control during reproduction of pre-roll of consecutiv... | 05/16/2006 |
| 7042665 | Apparatus and method for reproducing recorded signal In an apparatus for reproducing a recorded signal and the like of this invention, two reproducing heads are provided for a single track with their set positions being deviated in the track width direction. A signal selecting unit discriminates a reproducing head who... | 05/09/2006 |
| 6999258 | Time-based servopositioning systems Servo positioning systems, methods, formats, and data recording media used in association with the same, employing additional timing reference information to improve immunity to time-based errors caused by instantaneous speed variations. ... | 02/14/2006 |
| 6981198 | Dynamic error correction code shortening A method and system are provided for dynamically shortening a number of error correction codewords to correspond to an amount of user data to be recorded on a recording medium. The system and method determine in advance that the number of bytes of user data will onl... | 12/27/2005 |
| 6937542 | Recording device and method of detecting tracking error signal and wobble signal of a wobbled track of an optical disk In an optical disk recording device for projecting a recording light beam onto an optical disk to form 3T-11T pits in a land of the optical disk, timing to sample and hold a reflected light detection signal for tracking servo control is delayed behind timing to samp... | 08/30/2005 |
| 6934108 | Servo pattern based tape tension control for tape drives A system and method of controlling tape tension during operation of a tape drive by making use of pre-existing timing based servo patterns formatted on the media. Changes in servo pattern timing are read at regular intervals and used to calculate changes in tension,... | 08/23/2005 |
| 6718120 | Magnetic recording and reproduction method and apparatus In a recording and reproduction method for recording digital data on magnetic tape by a helical scanning method or for reproducing digital data recorded on magnetic tape by the helical scanning method, a plurality of sectors are generated in each track on the magnet... | 04/06/2004 |
| 6697209 | Phase based time domain tracking for helical scan tape drive In a helical scan recording system, magnetic tape (31) is transported by a tape transport (98) proximate a rotating scanner (85). The scanner has a pair of read heads (82) mounted thereon, e.g., a first read head and a second read head, which travel in a ... | 02/24/2004 |
| 6590733 | Digital processing of pilot-tone amplitudes In a system having an input signal set with at least two signals having mutually exclusive frequencies f1 and f2 being part of the input signal set, whose amplitude is represented in an input digital representation, the amplitudes of each of the at least ... | 07/08/2003 |
| 6580573 | DISK DRIVE HAVING A CHANNEL CIRCUIT WHICH RECEIVES A READ SIGNAL REPRESENTING DATA IN A DATA SECTOR AND DATA IN A SERVO SECTOR IN A FIRST ORDER AND DEMODULATES THE READ SIGNAL TO PROVIDE DATA SECTOR DATA AND SERVO-SECTOR DATA IN A SECOND ORDER A disk drive has a channel circuit for demodulating data sectors and servo sectors stored on a rotating medium to provide data-sector data and servo-sector data. The channel circuit transmits the data-sector data and servo-sector data to a disk controller... | 06/17/2003 |
| 6219489 | Apparatus and method for discriminating recording mode In order to easily discriminate a recording mode of a magnetic tape even when the fast feeding/rewinding reproducing operation is set to the odd number times speed or even number times speed, a standard pilot signal for generating the tracking error signa... | 04/17/2001 |
| 6154336 | Frame synchronizing circuit in a magnetic recording and reproducing apparatus and a frame synchronizing method thereof A reproducing signal read out by a reproducing head is transmitted to a demodulator including a track number detecting circuit through a reproducing amplifier. A microcomputer performs tracking control by controlling the rotation of a capstan based on the... | 11/28/2000 |
| 6141177 | Signal reproducing device and method with tracking error formation A device that reproduces signals recorded on a recording medium includes a unit that forms a tracking error signal from pilot signal components recorded in the signal being reproduced. A controller controls the tracking error signal forming unit so that t... | 10/31/2000 |
| 6137648 | Magnetic tape and a method for recording and reproducing a plurality of different information signals on and from the magnetic tape In an information signal recording method for recording one information signal on slant tracks formed on a magnetic tape housed in tape cassette usable in a conventional magnetic recording and reproducing apparatus capable of reproducing another informati... | 10/24/2000 |
| 6134074 | Reproducing apparatus having tracking control in accordance with track number information There is provided a reproducing apparatus arranged to reproduce an information signal from a recording medium on which a number of recording tracks are formed in parallel with each other and the information signal is recorded on the recording tracks toget... | 10/17/2000 |
| 6130799 | Signal recording and/or reproducing apparatus, method, and medium with pilot signal and tracking servo signal recorded at different azimuth angles A method and apparatus for recording and/or reproducing signal on or from a recording medium, wherein correct tracking servo signals may be produced so that tracking errors may be detected correctly. The pilot signal from a recording amplifier 3, produced... | 10/10/2000 |
| 6101060 | Method and apparatus for reducing data loss errors in a magnetic tape device A method and associated apparatus for reduction of data loss errors in computer data tape transport applications. In tape transport devices with moveable read heads (i.e. auto-tracking read/playback heads), by sensing telemetry information regarding tape ... | 08/08/2000 |
| 6081395 | Apparatus and method for generating a digital tracking signal with a frequency spectrum corresponding to one or more n-bit words A signal recording apparatus for a video instrument using a magnetic recording medium which is capable of more accurately computing the signal to be recorded on the tape by correcting the output signal when affixing "1" or "0" after computing the output s... | 06/27/2000 |
| 6021017 | Magnetic recording and playback device which processes error signals to obtain a servo correction signal A tracking error signal is detected using an error detector, from cross-talk components at a point in each of the regions of several duplication areas from which reproduction is possible, and tracking control is performed using a servo circuit, based on t... | 02/01/2000 |
| 6014284 | Signal reproducing apparatus having rotary heads rotating 180° out of phase and producing signals for tracking control A signal reproducing apparatus is arranged to have two reproduced signals reproduced from a plurality of tracks formed on a magnetic medium by two rotary heads arranged to rotate 180 degrees out of phase with each other and which trace positions shifted f... | 01/11/2000 |
| 6005741 | Reproducing apparatus using pilot signal crosstalk for tracking control and using pilot signals to eliminate a back lock condition An information signal reproducing apparatus for reproducing information signals from a recording medium in which a pilot signal component having a predetermined frequency is superimposed on the information signals at every other track of a plurality of pa... | 12/21/1999 |
| 5991109 | Magnetic recording and reproducing apparatus with signal delay and selection A magnetic recording and reproducing apparatus includes a reading and writing head for writing data on data tracks formed on a recording tape and reading the data therefrom to produce a first reproduction data. A simultaneous reproducing head is provided ... | 11/23/1999 |
| 5978171 | Information signal reproducing apparatus with diverse mode tracking control In a reproducing apparatus for reproducing an information signal from a recording medium on which a number of recording tracks are formed in parallel to each other and on which the information signal is recorded with a pilot signal component superimposed ... | 11/02/1999 |
| 5973868 | Recording and/or reproducing apparatus with means for establishing an after-recording area Rotary head recording and/or reproducing apparatus in which respective oblique tracks on a record medium are scanned, each track having an information signal area in which information data is recorded and a track following area in which a tracking control... | 10/26/1999 |
