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"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
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| Number | Title | Issue Date |
| 7974031 | Single-pass recording of multilevel patterned media A method of performing data/information recording and retrieval utilizing a multilevel patterned magnetic medium, comprises providing a magnetic recording system including a read/write head and a multilevel patterned magnetic recording medium including a plurality o... | 07/05/2011 |
| 7212482 | Apparatus and method to dynamically adjust the amplitude of a signal comprising information A method and apparatus to dynamically adjust the amplitude of a signal comprising information read from an information storage medium. The method first forms (N) digital signals comprising information read from an information storage medium. The method provides a fi... | 05/01/2007 |
| 7136251 | Methods for WORF improvement in conditional servowriting To account for head misplacement while servowriting, adjustments to thresholds used during writing and/or trimming of servo information can be used. A threshold can be used to disable servowriting when it is determined that servo information will not be written and/... | 11/14/2006 |
| 6961510 | Reproducing device with automatic change-over between trick-play speeds In a reproducing device (1) for the reproduction of reproduction data (WD) recorded on a magnetic tape (2), having transport means (7) for the transport of the magnetic tape (2) with a normal-play speed (VNS, VNLS2, ... | 11/01/2005 |
| 6798363 | Method for compensating an offset in an asymmetric reproduction signal The present invention relates to a method for compensating asymmetry in a reproduction signal DRSO from an optical recording medium, and to an apparatus for reading from and/or writing to optical recording media using such method. It is an object of the invention to... | 09/28/2004 |
| 6697208 | System and methods for using offset information on a data storage medium A system and methods for providing offset information on a storage medium are provided by writing at least one unalterable mark on the storage medium during a manufacturing formatting process. The unalterable mark(s) are variably offset from a fixed posit... | 02/24/2004 |
| 6359744 | Reducing thermal decay of data signals recorded on magnetic media A data storage device 15 comprises a recording head 35 and a recording media comprising a layer of magnetic material having an anisotropy that is substantially perpendicular to a plane of the layer. The device encoder 80 is adapted to provide an encoded d... | 03/19/2002 |
| 6055117 | Systems and method having data encoded with edge placement equalization A data recording system includes media such as a magnetic disk or tape, a read/write head assembly, and a circuit that provides a write signal having edge placement equalization. The circuit responds to a binary serial data signal such as a run length lim... | 04/25/2000 |
| 6049438 | Method and apparatus for encoding digital servo information in a servo burst A method and apparatus for writing binary servo data into the servo bursts contained on the storage medium of a storage device. The binary servo information may include track identifying information such as a track number, cylinder number, head number, se... | 04/11/2000 |
| 5930303 | Digital modulation employing single sideband with suppressed carrier A method for transmitting "biphase" encoded digital signals including the steps of setting an aperture corresponding to a data bit; dividing said aperture into a plurality of segments; setting a first segment, selected from said plurality of segments of s... | 07/27/1999 |
| 5889820 | SPDIF-AES/EBU digital audio data recovery A circuit for decoding an input signal includes a measurement circuit having an input to receive a timing clock signal that is asynchronous with clocking of the input signal, to measure duration of a plurality of pulses received on the input signal in rel... | 03/30/1999 |
| 5844738 | Synchronous read channel employing a sequence detector with programmable detector levels A synchronous read channel is disclosed which samples an analog read signal from a magnetic read head positioned over a magnetic disk medium, filters the sample values according to a desired partial response, extracts timing information from the filtered ... | 12/01/1998 |
| 5642338 | Information recording medium and apparatus and method for recording and reproducing information The data recording/reproducing apparatus of the present invention efficiently performs a trickplay mode operation such as fast forward reproducing and rewind reproducing and a postrecording operation by using a data recording medium storing a variable-bit... | 06/24/1997 |
| 5467231 | Using recorded data for auto calibration of fixed gain of a read amplifier in a data storage device A method and apparatus for using a varying amplitude data signal from a data storage medium such as a magnetic disk or magnetic tape to calibrate the gain of the data signal amplifier to an optimal fixed gain. At initialization, amplified data signal peak... | 11/14/1995 |
| 5434400 | Method and apparatus for decoding F2F signals read from a magnetic data carrier A method for decoding F2F signals as well as a device for decoding F2F signals read from a magnetic data carrier is provided. The signal read from the card by a magnetic reading head is amplified by an amplifier with a very high gain, discriminated in a d... | 07/18/1995 |
| 5212601 | Disk drive data synchronizer with window shift synthesis A phase-locked system for recovering data from a disk drive includes a phase detector for signalling the difference in phase between incoming delayed data pulses and a phase detection window clock signal. The phase detection window clock signal is derived... | 05/18/1993 |
| 5163067 | Method and apparatus for decoding Manchester encoded data A receiver for Manchester encoded data includes an autocalibration feedback loop that generates a timing pulse used to recover the clock and data signals. The autocalibration feedback loop includes a first digital delay line sampled by a plurality of D-ty... | 11/10/1992 |
| 5107377 | Method and apparatus for digital storage and retrieval of data A method and apparatus for error detection and correction in the storage and retrieval of digital data on magnetic storage systems includes converting the digital data into analog waveforms, multiplexing the analog waveforms with reference values and stor... | 04/21/1992 |
| 5050009 | Video tape recorder with a joint-recording capability and a video camera having the same A helical scan video tape recorder includes a recording device having a head cylinder which carries magnetic heads therewith for rotating the head cylinder and applying incoming video signals to the magnetic heads to record the signals on a magnetic tape.... | 09/17/1991 |
| 5025328 | Circuit for decoding binary information Electrical circuits suitable for decoding binary information, in accordance with a novel modulation method. The novel modulation method is referenced in the instant case, and it is explained that the method may be used when an encoding or decoding informa... | 06/18/1991 |
| 4954825 | Self clocking binary data encoding/decoding method A method for modulating binary data into a format suitable for encoding and decoding information, that employs a non-return-to-zero (NRZ) technique. The modulating method includes: defining within a recording medium an event-cell as the time between two a... | 09/04/1990 |
| 4951049 | Self clocking binary information encoder An electrical circuit suitable for encoding binary information, in accordance with a novel modulation method, is provided. The encoder circuit includes: a clock driver; an n-phase counter driven by the clock driver for producing a succession of event-cell... | 08/21/1990 |
| 4912467 | Three-part encoder circuit Electrical circuits suitable for encoding a binary data stream into a tri-bit code format. The circuits are particularly valuable for situations where the encoding or information transfer rate is dependent on unpredicable and variable transfer rate veloci... | 03/27/1990 |
| 4873524 | Decoding unit for CMI-encoded signals Decoding unit for CMI-encoded input signals. A signal having 0/1 transitions is first derived from a signal. A 0/1 transition occurs in a CMI-signal as the result of encoding a binary zero or two consecutive binary ones. In the latter case the 0/1 transit... | 10/10/1989 |
| 4868853 | Demodulation circuit for digital modulated signal A demodulation circuit for demodulating a modulated digital including a unit for detecting a specific pattern contained in a series of data before modulation, a unit for judging the phase relation between the specific pattern and a clock pulse used for de... | 09/19/1989 |
| 4747113 | Process for the base band modulation of a data signal, as well as the corresponding modulation and demodulation apparatuses A process for the base band modulation of a data signal on a magnetic support is characterized in that: (a) a bit value of 0 is marked if it follows an unmarked bit of value of 0 or a sequence of three consecutive unmarked bits of value 1; (b) a bit value... | 05/24/1988 |
| 4742532 | High speed binary data communication system There is disclosed a high speed data transmission system for transmitting a binary data signal over a communications path. The binary data signal is clocked at a given period. The system comprises encoded means responsive to a binary NRZ input data signal... | 05/03/1988 |
| 4688232 | Decoder for Manchester encoded data A decoder for Manchester encoded data in which the encoded data is sampled by a clock signal to produce a decoded data signal. The decoded data is combined with a delayed version of the encoded data, to produce the clock signal. In a preferred version, a ... | 08/18/1987 |
| 4663678 | System for writing and reading digital data interspersed with analog audio frequency data on magnetic recording tape A recording system is provided in which digital time code information is recorded interspersed on the same data track as analog audio message signals. The time codes have a unique format which enables their bit rate to be extracted while reading the code,... | 05/05/1987 |
| 4663767 | Optical data bus having a statistical access method An optical data bus with a statistical access method for the transmission of data between transmitters and receivers in the form of NRZ data provides that every transmitter of a subscriber contains a Manchester encoder which Manchester encodes the NRZ dat... | 05/05/1987 |
| 4639793 | System for recording or detecting two marking signals on a record carrier In recording and/or detecting two different marking signals on or from a record carrier, a generator for marking signals comprises at least one pulse generator which supplies marking signals in the form of two marking-pulse trains M1 and M2 having the sam... | 01/27/1987 |
| 4635141 | Method and apparatus for storing data on magnetic or optical media Method and apparatus for storing data on a recording medium wherein the method includes grouping digital binary signals into chunks of N bits where N is an integer greater than 1. The value of each of the N bit chunks is determined and converted into a sy... | 01/06/1987 |
| 4612508 | Modified Miller data demodulator A data demodulator is composed of a data separation circuit which produces synchronizing clock pulses from M2 modulation data which is reproduced by a data recording device and separates the M2 modulation data into clock bits and dat... | 09/16/1986 |
| 4606052 | Method for detection of line activity for Manchester-encoded signals A signal pre-processing method for detecting valid Manchester-encoded activity on a line carrying Manchester-encoded data signals to an inexpensive Manchester-decoding receiver. Detection is provided by monitoring both a positive-level presence and a nega... | 08/12/1986 |
| 4562422 | CMI Decoder The invention involves a decoder for converting CMI-coded signals into binary signals. Existing decoders of this type have a comparatively elaborate design and high power consumption. The invention teaches an improved decoder which has an AND gate and a N... | 12/31/1985 |
| 4562490 | Jackpot-resistant magnetic card encoding A method of magnetic encoding of credit instruments having a strip form magnetic recording medium provides at least one data field on the strip. First and second magnetic field orientations are selected for recordation on the medium of successive, adjacen... | 12/31/1985 |
| 4553131 | Method and apparatus for encoding a binary data stream into a binary code stream In an encode method in which a binary data stream is divided into data words each of three bits. Each of the data words is encoded into a binary code word of 9 bits. In the method, a code word to be encoded is encoded in consideration of a code word prece... | 11/12/1985 |
| 4544961 | Triplex digital magnetic recording and reproducing system A quaternary saturated digital magnetic recording system for enhancing information entropy provides an effective bit density increase of 100% or more over the MFM code. In the simplest implementation, groups of two input binary bits are mapped into one da... | 10/01/1985 |
| 4481548 | Magnetic recording and reproducing apparatus A still video signal is modulated to a PDM signal by a pulse duration modulator. The PDM signal is recorded by a perpendicular magnetic recording head on a recording medium of perpendicular magnetic anisotropy according to the perpendicular magnetic recor... | 11/06/1984 |
| 4473851 | Analog magnetic recording system for binary signals Digital data is recorded onto a cassette tape by utilizing an audio cassette tape recorder under the control by a microprocessor. The microprocessor assigns "0" digital data bit a time sequence of a shorter pulse of a single period (T1) and hav... | 09/25/1984 |
