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| Number | Title | Issue Date |
| 4827344 | Apparatus for inserting part of one video image into another video image Computer generated video objects may be superimposed over a background video image so as to create the illusion of a single composite scene. The leading edge of an object is detected and for a period of time the object and background video signals are mix... | 05/02/1989 |
| 4481614 | Velocity correction apparatus for disc record player A velocity correction apparatus for a disc record player includes a permanent magnet attached to a cartridge mounted pickup arm and an electromagnetic coil secured in a cartridge supporting carriage. The coil is fixed to a supporting member which conforma... | 11/06/1984 |
| 4459692 | Signal pickup cartridge A signal pickup cartridge is formed in two sections to facilitate assembly of a leaf spring to a stylus therein. The two sections are dimensioned to permit suspension of the stylus to the first section but protruding therefrom and connection of one end of... | 07/10/1984 |
| 4456837 | Circuitry for generating non-overlapping pulse trains A two phase waveform generator for producing nonoverlapping pulses is designed with a CMOS inverter modified to include a resistor between the drain electrodes of the complementary inverter transistors and three conventional CMOS inverter circuits. The re... | 06/26/1984 |
| 4455638 | RF Radial choke for use in record playback apparatus In a record playback system which includes a substantially enclosed conductive arm carriage to support and translate a stylus/stylus arm assembly and an oscillator in the carriage to provide a signal at a given frequency, a symmetrical choke is formed in ... | 06/19/1984 |
| 4455633 | Method for evaluating distortions in video disc recordings An electromechanical cutting stylus is used in a system for mastering video disc recordings in a metal substrate. The cutting stylus introduces signal distortions and errors into the mastering process such that the quality of the reproduced signal display... | 06/19/1984 |
| 4451912 | Record extraction mechanism for disc player A video disc player has a record extraction mechanism to facilitate record loading and unloading while the record remains enclosed in its caddy. The caddy comprises a record retaining spine releasably secured to an outer sleeve by means of a pair of spine... | 05/29/1984 |
| 4450550 | Pickup circuit for video disc including dual-gate FET with injected RF A stylus, having a conductive electrode, is arranged to follow a spiral groove on a disc in a video disc player. Video and audio information are recorded in the bottom of the groove as relief variations. When relative motion is established between the sty... | 05/22/1984 |
| 4450394 | Stepper motor drive circuit A simplified drive circuit for applying bipolar drive current to a stepper motor includes a switch for alternately connecting a first end of the stator winding between supply potential and ground. The second end of the winding is coupled to supply potenti... | 05/22/1984 |
| 4449215 | Apparatus for varying track spacing in multi-track optical record systems A Dove prism is provided in a multiple beam optical disc record and playback system. In a multi-track optical system, the multiple spots formed in a multi-channel modulator are imaged on the record medium. The track-to-track spacing between adjacent track... | 05/15/1984 |
| 4449118 | Switching circuitry as for a flash A/D converter A flash type A/D converter has a plurality of transistor switch means for alternately connecting respective ones of a plurality of reference potentials or input signal to a plurality of summing capacitors each serially connected to a self biased inverter ... | 05/15/1984 |
| 4443872 | Video disc player having caddy lockout mechanism A caddy-type player has a pair of spring-loaded lockout members disposed at the opposite ends of the caddy input slot. The lockout members are positioned inside and outside the caddy insertion path, respectively, in response to the presence of and the abs... | 04/17/1984 |
| 4443871 | Stylus lowering, lifting and cleaning apparatus In a record playback system, which includes a carriage within which a stylus arm is mounted, it is desired to clean the stylus tip from time to time. The apparatus according to the present invention lowers and lifts the stylus so as to effect stylus-recor... | 04/17/1984 |
| 4442409 | Push-pull non-complementary transistor amplifier A push-pull amplifier having like conductivity output transistors is driven by a phase-splitter transistor amplifier. The collector load of the phase-splitter includes a diode bridge for establishing the amplifier idling current. One arm of the bridge inc... | 04/10/1984 |
| 4441176 | Damping mechanism for a video disc stylus holder Video disc stylus holders are designed to provide vertical decoupling of the pickup stylus from the stylus support arm. The compliance designed into the holder gives rise to mechanical resonant modes which affect the recovered signal in the audio range. A... | 04/03/1984 |
| 4439852 | Disc player having record handling apparatus A record handling mechanism in a disc record playback system includes a record lifting finger which rises through a slot in the turntable to lift a record against a pair of stops located above a set of record receiving pads. The record receiving pads are ... | 03/27/1984 |
| 4435799 | Disc record player having shutoff switch actuating apparatus The player has a record handling mechanism which consists of a sequencing cam for coordinating the operations of a record lifting finger and a set of record receiving pads. To transfer a record from the record receiving pads to a turntable for playback, t... | 03/06/1984 |
| 4433407 | Method and apparatus for recording video signals into a metal substrate A cutting stylus is positioned with respect to a metal substrate in order to cut a groove. The cutting stylus is vibrated about a quiescent position in response to a relatively high frequency signal while cutting the groove in order to cut an information ... | 02/21/1984 |
| 4432086 | Turntable apparatus for video disc player A turntable secured to a bearing member is freely rotatable about a support post. The bearing member has radial slots through which the fingers of a segmented spindle protrude. The spindle is axially slidable on the post. A spring is disposed about the po... | 02/14/1984 |
| 4429678 | Cutting stylus for mechanically cutting masters for keel-lapping A cutting stylus adapted for mechanically cutting a deep groove, which may be used in lapping the keel on a playback stylus, is provided. The stylus includes a tapering body, a constricted terminal region and shoulders joining the tapering body and the co... | 02/07/1984 |
| 4429376 | Video disc stylus deflector system A video disc player apparatus having a signal pickup stylus secured to a stylus arm for recovering recorded signal from a disc record, wherein the stylus arm is mechanically biased by a spring force to produce a positive stylus-disc pressure, includes app... | 01/31/1984 |
| 4429284 | Operational amplifier A differential amplifier stage is disclosed which utilizes opposed pairs of complementary transistors. The emitter electrodes of the complementary transistors of each pair are connected via matched resistors. A second matched pair of resistors are connect... | 01/31/1984 |
| 4429283 | Differential current amplifier A differential current amplifier includes a differential input transistor pair having respective first and second unity gain current mirror amplifiers (CMA) connected in their respective output circuits. The output terminal of the CMA connected in the out... | 01/31/1984 |
| 4424630 | Apparatus for measuring the dimensions of delicate parts A measuring gauge, suitable for measuring the plastic record caddy for a video disc, uses a transducer and a driver assembly. The transducer includes a plunger which will trigger a detector if a force of less than one gram is applied thereto. The transduc... | 01/10/1984 |
| 4424493 | Cross-coupled complementary power amplifier A power amplifier circuit includes an output complementary emitter-coupled transistor pair driven by a second pair of complementary transistors having a parallel resistor diode combination serially connected between their emitters to establish idling curr... | 01/03/1984 |
| 4423500 | Stylus lifting/lowering actuator with air damping A lifting-lowering assembly for a stylus arm employs two flat portions having a pivot axis in the vicinity of the intersection of the two portions, a stylus arm rest on the first portion, and, an upwardly extending member on the second portion. The upward... | 12/27/1983 |
| 4422052 | Delay circuit employing active bandpass filter A signal to be delayed is applied to a frequency selective path including an inverting active bandpass filter and to a non-frequency selective path including a voltage-to-current converter. The paths are coupled to a signal combiner which produces an outp... | 12/20/1983 |
| 4419699 | Digital on video recording and playback system In a system for recording digital information on a video disc and for playback of the digital information therefrom, the digital data is recorded in synchronism with the color subcarrier signal on a horizontal line adjacent to a constant luminance line. T... | 12/06/1983 |
| 4418408 | Stylus arm for video disc player A stylus arm assembly is formed by heating the stylus to about 250° F., and then inserting it into a section of heat shrink tubing. The subsequent heating of the joint causes the portions of the heat shrink tubing surrounding the stylus to shrink to fixe... | 11/29/1983 |
| 4418364 | Video player apparatus having caption generator A composite video signal including a timing component and a caption video signal having no timing component are combined to form a resultant video signal for application to a television receiver. The caption signal is produced by a character generator tha... | 11/29/1983 |
| 4417160 | Offset compensation apparatus for biasing an analog comparator A threshold comparator for use with a dual slope A/D converter has its input potential established at its threshold potential during auto-zeroing. Potential offset means is included in the auto-zero feedback loop around the integrating and output amplifie... | 11/22/1983 |
| 4412319 | Video disc player with self calibrating stylus translator An adaptive video disc record stylus kicker system for inducing limited stylus translation radially across the disc record. Control circuitry responsive to track identification signals recorded on the disc and to player commands evaluates the error betwee... | 10/25/1983 |
| 4409626 | Video disc player having vertical timing signal generator A signal source continuously produces a horizontal timing signal proportional to the line rate of a recovered composite video signal. A vertical timing unit coupled to the source continuously produces a vertical timing signal proportional to the field rat... | 10/11/1983 |
| 4408315 | Video disc player having stylus cleaning apparatus A stylus cleaner arm is pushed back to a retracted position when a record-bearing caddy is inserted into the player to load an enclosed record therein. The cleaner arm is held in the retracted position by a record retaining spine upon subsequent jacket wi... | 10/04/1983 |
| 4404670 | Pickup arm retainer for video disc cartridge A retainer for holding the stylus arm of a video disc signal pickup cartridge is described which is low cost and occupies little space in the cartridge. The retainer is formed from flat spring stock and shaped to have a three-sided body with fingers exten... | 09/13/1983 |
| 4404669 | Stylus assembly Assembly of a video disc signal recovery stylus apparatus is facilitated by utilizing a stylus holder having a vertical cylindrical end. A conductive leaf spring is inserted in the cylinder followed by a conductive torroidal elastomer. The stylus is then ... | 09/13/1983 |
| 4403369 | Internal caddy cleaning apparatus The walls of a video disc caddy are vibrated at or near their resonant frequency to dislodge foreign matter adhering to the inside surfaces of the walls. The separated foreign matter is collected by the pressurized air circulating inside the caddy enclosu... | 09/13/1983 |
| 4402072 | Video disc mastering using gimballed air puck A gimballed air puck is used in a video disc mastering system for controlling the depth to which an electromechanical stylus cuts into a metal substrate surface. Air is directed through the air puck toward the substrate surface to maintain the cutting sty... | 08/30/1983 |
| 4400806 | Pickup arm suspension for video disc cartridge A video disc signal pickup cartridge is described wherein the stylus arm is coupled to the cartridge body by a highly compliant relatively long, flat member suspended vertically from the top wall of the cartridge. The stylus arm is coupled to the member b... | 08/23/1983 |
| 4399329 | Stereophonic bilingual signal processor The format of two audio input signals, which may be of either matrixed form wherein each signal comprises two common components or of unmatrixed form wherein each signal comprises a respective independent component, is determined by applying the signals t... | 08/16/1983 |
