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| Number | Title | Issue Date |
| 6724826 | Method and apparatus for improving the image quality of transmitted video signals via pre-filtering A method and apparatus is disclosed which minimizes the visual artifacts normally generated when images are compressed for transfer through very narrow band channels such as, for example, the Internet. To this end, the images are pre-filtered and then scaled down pr... | 04/20/2004 |
| 4780779 | Laminated sendust metal-in-gap video head An improved magnetic head structure which places a laminate at the gaps of the head, said laminate deposited on each substrate facing the gap, and comprising alternating layers of first and second magnetic materials, said first material having a higher co... | 10/25/1988 |
| 4751586 | Rotary head tape transport servo system having high speed servo lock capability A method and apparatus for controlling the capstan servo of a magnetic video tape recording and reproducing machine is disclosed. The invention provides almost instantaneous color framing and synchronous control track lock when accelerating from a very sl... | 06/14/1988 |
| 4751375 | Method and apparatus for reading bar code under rapidly changing scanning speed conditions A bar code reader system includes a stream of pulses whose period is a function of the scan speed of the reader as it scans the bars and spaces of a bar code symbol. Transition pulses are supplied which identify the boundaries of the bars and spaces. The ... | 06/14/1988 |
| 4743984 | Scheme for encoding a magnetic tape cassette A coding array usable on a series of cassettes of varying size, the array symmetrically located in a threading area of the cassette with respect to designated cassette reference points, to present the array of each size cassette to the associated recorder... | 05/10/1988 |
| 4731685 | Transducing head mounting on an unsupported length of spring To stabilize the transducing head of a magnetic disc memory apparatus, the head is mounted on a flexible leaf aligned transverse to the disc radius; the upstream leaf end is fixed to the head carriage, and the downstream leaf end is restrained against mot... | 03/15/1988 |
| 4727370 | Method and system for synchronous handshake generation A method and system are provided for generating a synchronized handshake between communicating parts of a digital system operating from a common clock. A request signal is sent from an initiating station to a responding station. The responding station ack... | 02/23/1988 |
| 4715558 | Single piece tape reel and assembly A single piece tape reel and assembly which combines a hub portion, a bottom flange and a top bearing cover into a one-piece member of substantially improved rotational stability.... | 12/29/1987 |
| 4707653 | Frequency measurement circuit A frequency measuring circuit measures the period between successive pulses of an input signal and converts the pulse count to a measured frequency value. The measured frequency signal is filtered to eliminate spurious noise and a variable threshold is ge... | 11/17/1987 |
| 4697207 | System for generating a synchronizing signal in response to two timing reference signals A method and system for composite system phase control in a signal processor such as a television video recorder operating in a genlocked system. A synchronizing signal, preferably a frame-rate horizontal reset pulse, is generated in response to coinciden... | 09/29/1987 |
| 4695876 | Method and apparatus for the extraction of luminance information from a video signal using a field store A method and apparatus for the extraction of luminance information from an analog composite video signal. Non-luminance information in the video signal is 180° out of phase between adjacent lines in adjacent fields of a video signal. Appropriately filter... | 09/22/1987 |
| 4695873 | Horizontal line data position and burst phase encoding apparatus and method Information related to the beginning of data and the phase of color burst on consecutive horizontal scan lines of a digital color television signal is encoded into a variable width pulse. A first transition of that pulse has a predetermined phase relation... | 09/22/1987 |
| 4694343 | Digital effects device integrally combined within a video switcher A digital effects unit is integrally combined with a video switcher apparatus by interrupting various selected video signal and control paths in the switcher and, in particular, the mix effects signal from the first mixer and the pattern signal from the p... | 09/15/1987 |
| 4694344 | Digital effects loop for video switchers A digital effects loop is inserted in the video and key signal buses which extend to a mixer of a switcher apparatus, and a digital effects unit is coupled to the loop. Circuitry is included in the loop to interrupt the particular bus or buses and the sig... | 09/15/1987 |
| 4692819 | Method and apparatus for controlling the position of a transported web An apparatus and method for controlling the position of a web containing location identifying information thereon. In particular, a means for measuring displacement of the web independent of the location information is employed to measure the displacement... | 09/08/1987 |
| 4688326 | Method of manufacturing a modular magnetic head assembly A nonmagnetic holder is made having a plurality of precisely located parallel grooves. Each groove has a reference lateral surface provided therein. Individual magnetic transducers are inserted in each groove with a lateral surface abutting the reference ... | 08/25/1987 |
| 4688080 | Multi-standard adaptive chrominance separator An adaptive chrominance separator is provided which responds to horizontal high frequency luminance detail as well as to vertical chrominance detail. The luminance and chrominance levels are detected and an adaptive decision is made, depending upon the re... | 08/18/1987 |
| 4685016 | Door operating mechanism for a cassette usable in a magnetic tape recorder A door operating mechanism for a magnetic tape cassette, such mechanism including a door latch mechanism provided in the cassette capable of rotating a door assembly of the cassette from the fully closed to the fully opened position and designed to preven... | 08/04/1987 |
| 4684990 | Method and apparatus for combining multiple video images in three dimensions A plurality of input video signals (including background) are combined in accordance with priority. Each video signal comprises data samples corresponding to respective discrete locations on a viewing plane. The signals are preferably from an ADO transfor... | 08/04/1987 |
| 4683167 | Magnetic iron oxide pigment and recording media An improved magnetic particulate pigment suitable for use in recording media and media employing it are disclosed. The particles of the pigment comprise a magnetic core with an epitaxial layer containing approximately 0.05-2.0% of the total pigment as zin... | 07/28/1987 |
| 4679098 | Video tape transport servo for variable tape speed control A capstan servo for moving video tape with variable speed during playback controls the tape speed according to time period inputs. The input specifies the number of seconds per hour of program length, for example, that a segment of recorded video informat... | 07/07/1987 |
| 4677388 | Synchronization slicer There is disclosed herein an apparatus and method for accurately ascertaining the time of occurrence of passage of the leading and trailing edges of an input pulse through the 50% amplitude level. The apparatus implements the transfer function 1 - cos(wt)... | 06/30/1987 |
| 4675723 | Single oscillator PAL generator lock system A signal generator for generating a clocked PAL reference video signal from a single signal source wherein a counter-divider extracts subcarrier frequency component from the PAL reference video signal and modulator means in combination with a counter-divi... | 06/23/1987 |
| 4675724 | Video signal phase and frequency correction using a digital off-tape clock generator In a time base correction system, a composite color television analog signal derived from a prerecorded tape is converted by an analog-to-digital (A/D) converter to a digital signal having horizontal sync and color burst signal components. The digitized s... | 06/23/1987 |
| 4675760 | Information signal recording and/or playback system and method using a prerecorded reference track A reference track is recorded in a longitudinal direction on a recording medium. During recording of an information signal along parallel tracks on the medium a deviation of the reference track in a transverse direction from its nominal position with resp... | 06/23/1987 |
| 4675905 | Multiple input silent audio switch A silent audio switch provides switching between multiple audio sources while eliminating the "pop" caused by switching spikes. Two internal buses are used for each visible external bus, whereby a new audio signal is first switched to an off-air bus oppos... | 06/23/1987 |
| 4672474 | Synthetic control track signal producing apparatus for video tape machines A synthetic control track signal is provided for a magnetic video tape recording and/or reproducing machine having a motor driven capstan and capstan servo which controls the speed of the tape during recording and reproducing. The synthetic signal enables... | 06/09/1987 |
| 4667271 | Adjustable front control panel for a tape transport component arrangement A tape transport front panel is adjustable to position the controls conveniently for operators in various positions.... | 05/19/1987 |
| 4663654 | Blanking signal generator for a subcarrier locked digital PAL signal Non-orthogonality of the blanking region information caused by the 25 Hz offset in a digital PAL-encoded color television signal is corrected by a dynamic offset circuit. To this end, a plurality of waveforms describing the envelopes of the blanking, sync... | 05/05/1987 |
| 4663544 | High performance analog gate/absolute value circuit An analog gate configuration employing multiple input transistors, eliminates distortion in its output signal when switching between multiple input signals during a corresponding switch-over interval when the input transistors are sharing current, by prov... | 05/05/1987 |
| 4654735 | Latch for head positioning actuator for disc files A latch for the pivoting head arm of a data-storage magnetic disc machine, in which a U-shaped latching member is arranged to avoid malfunctioning to block the movement of the arm, and may be operated entirely by means of a toggle spring, or entirely by m... | 03/31/1987 |
| 4652946 | Fast deploying tape transport A machine for extracting tape from a cassette and for threading the tape to a monoplanar disposition for longitudinal shuttling and transducing by fixed transducing heads, and then further threading the tape, if desired, to a helical disposition around a ... | 03/24/1987 |
| 4651232 | Method of controlling apparatus for recording and/or reproducing on a record medium A method and apparatus is disclosed for recording and reproducing color television signals on a magnetic media such as magnetic tape, wherein the signals recorded on and reproduced from the magnetic media are in a digital domain. The analog color televisi... | 03/17/1987 |
| 4649450 | Modular multichannel magnetic head assembly with accurate channel locations A nonmagnetic holder is made having a plurality of precisely located parallel grooves. Each groove has a reference lateral surface provided therein. Individual magnetic transducers are inserted in each groove with a lateral surface abutting the reference ... | 03/10/1987 |
| 4649441 | Head reel servo system in a recording and/or reproducing apparatus An improved reel servo for a recording and reproducing machine is disclosed. The reel servo as well as other servos in the machine are controlled by a single microprocessor which results in greater inherent communication between such servos and significan... | 03/10/1987 |
| 4645561 | Metal-polishing composition and process The working surfaces of nickel-coated substrates for rigid magnetic discs are polished in a single-step process that employs a polishing composition comprising an aqueous suspension of unlubricated aluminum oxide powder having a hexagonal crystal shape an... | 02/24/1987 |
| 4638230 | Bang-bang controlled velocity command generator In a disc information storage system which employs a servo data disc, a servo data head and a moveable carriage assembly for transporting a plurality of magnetic heads radially across the surface of the disc in response to a control signal produced in con... | 01/20/1987 |
| 4635878 | Indexing means for tape cassette A tape cassette has a springloaded indexing mechanism to urge the cassette reels in a tape winding directions so as to tension the free run of tape between the reels whenever the cassette is removed from the tape transport machine.... | 01/13/1987 |
| 4635138 | Microprocessor controlled reproducing apparatus having asynchronous reproducing capability A microprocessor controlled multiple servo system for use with a recording and reproducing apparatus is disclosed. The system controls all servo systems for a magnetic tape recording and reproducing apparatus, including a capstan servo, a reel servo, a sc... | 01/06/1987 |
| 4633200 | Voltage controlled equalizer A voltage controlled equalizer has two parallel signal paths. A first signal path is provided by a delay line coupled to an input of an amplifier. A control circuit is coupled between an input of the delay line and an output of the amplifier, via a second... | 12/30/1986 |
