Abstract: The present invention allows multiple IC devices to be placed on the same substrate within a single BGA package. The invention requires minimum distances to be kept between electrical connections of the IC devices to maintain the electrical isolation, so that the devices can be operated at different voltage differentials. Signals between the devices can be connected externally from the package to each other utilizing galvanic isolation techniques. The invention provides the flexibility of choice for the customers to use isolation or not between the devices and takes up less PC board space because only a single package is used on the board.

Abstract: The present invention allows multiple IC devices to be placed on the same substrate within a single BGA package. The invention requires minimum distances to be kept between electrical connections of the IC devices to maintain the electrical isolation, so that the devices can be operated at different voltage differentials. Signals between the devices can be connected externally from the package to each other utilizing galvanic isolation techniques. The invention provides the flexibility of choice for the customers to use isolation or not between the devices and takes up less PC board space because only a single package is used on the board.

Abstract: An intelligent interface arrangement is provided for controlling operation of peripheral devices including a video device and a random access slide projector from a computer. The computer via the interface arrangement also controls the audio and video inputs to the system monitor for the selection of either audio channel from the video device, no audio, or mixed audio. The video control includes selection of video from the video device or computer. The computer addresses the interface arrangement with a predetermined unique address code. The address also includes the category of video device to be controlled. Each command sequence from the computer to the interface arrangement includes a start of command byte, one or more command bytes and an end of command byte. Each communication command sequence also includes a video-audio device command byte for selection of desired audio and video modes.

Abstract: Apparatus is provided for the control of a video tape or cassette recorder by a microcomputer. The apparatus is interfaced to the video recorder for the input and output of various control signals via the remote control connector of the video recorder. The apparatus also includes interconnections to a microcomputer, a monitor and the audio and video signals of the video recorder. The apparatus under the control of the microcomputer controls operation of the video recorder and selectively supplies either video recorder video or microcomputer video to the monitor and independently supplies one of the two audio channels of the video recorder or no audio to the monitor. The apparatus under keyboard inputs from the microcomputer controls transport functions of the video recorder including rewind, fast forward, various play speeds, stop and pause.

Abstract: Interactive training apparatus is provided as a self-contained, mobile unit. The interactive training apparatus includes a program control unit and audio and video program transducing units responsive to respective program records. The program control unit includes a computer and a control program record. The various program records define a lesson of a training program and include program control information and audio and video program information. The apparatus includes a fold-out keyboard for limited access by an instructor-operator to organize or enroll the various learner-operators for the lesson. A video display monitor is provided on a movable shelf at the top of the cabinet. The learner-operator interfaces with the interactive training apparatus as to entry of information via a light pen device that provides visual display frame information to the central control unit.

Abstract: An intelligent interface arrangement is provided for controlling and sensing operation of one or more random access slide projectors from a host computer or intelligent terminal. The interface arrangement includes a first microprocessor controlled communication section and a second microprocessor controlled receiver section. One of the receiver sections is provided for each slide projector to be controlled. The communication section bidirectionally communicates with the host over a first communication interface and bidirectionally communicates with the receiver section over a second communication bus structure. The receiver section communicates with the controlled slide projector over a control bus including predetermined signal points in the slide projector and keyboard control lines.

Abstract: Random access slide projector apparatus is provided for the random access presentation of slide programs. The random access apparatus is responsive to an encoded program tape or to input signals from a local or remote keyboard. The encoded program tape includes predetermined slide address signals as burst format signals corresponding to desired slide positions in the slide tray. The random access apparatus decodes the encoded slide address signals and generates appropriate control outputs to move the slide tray to the desired programmed slide position and project the desired slides. The random access apparatus also provides for the recording of slide address signals in accordance with keyboard entries to prepare random access program tapes. The program tape includes one track for the recording of encoded slide address signals and a second synchronized track for narrative program information to accompany the slide program.

Abstract: Control apparatus including a keyboard is provided for a slide projector to control operation of the slide projector in various predetermined modes to perform predetermined functions. Various functions are executed by the slide projector in response to the keyboard inputs. The keyboard includes an array of digit keys for the numerals 0 through 9 and various other function keys. Actuation of each of the function keys directly corresponds to either a function to be accomplished by the control apparatus or to a command mode input. Actuation of the digit keys provides designation of particular slide address numbers and also provides predetermined mode command inputs. The slide projector and control apparatus include an associated cassette tape recorder/player.

Abstract: A slide tray position sensing arrangement is provided for slide projector apparatus. The slide tray position sensing arrangement is arranged at a detection station. A coded aperture ring is provided that moves in a manner correlated to the movement of a slide tray turntable. The slide tray turntable carries the slide tray that holds the slides for projection and also functions as a tray transport arrangement. The coded aperture ring includes two circumferential arrays of apertures. Each of the apertures in the first array corresponds to a controlled slide position of a first tray type; e.g., an 80 slide tray. Each of the apertures in the second array corresponds to a controlled side position of a second tray type; e.g., a 140 slide tray. The slide tray position sensing arrangement is controllable to selectively sense the appropriate array of apertures corresponding to the slide tray type being utilized.

Abstract: Control apparatus is provided for a slide projector to accurately control rotation of a slide tray to predetermined slide positions of the slide tray and to provide integrated control of the slide change function at each slide position. The control apparatus operates in a forced mode between slide positions and operates in a servo mode to accurately position the slide tray at each of the predetermined slide positions. The detection of the slide positions utilizes a circumferential, apertured ring carried on a movable turntable that also carries the slide tray; the ring including a single incremental position aperture corresponding to each of the slide positions. Dual photodetectors are positioned at a sensing station to sense the respective slide position apertures, to provide differential position feedback detection signals in a servo loop, to interrupt the forced mode of operation and for controlling the stopping and positioning of the slide tray to a selected slide position in the servo mode.

Abstract: A control circuit is provided in projection apparatus to control the operating characteristics of the projection lamp. The projection lamp control circuit maintains a constant illumination output and color temperature of the projection lamp to provide improved operation and increased lamp operating life. The desired operating point of the projection lamp is accurately maintained by sensing the operating point of the projection lamp and utilizing the sensed deviation from the desired operating point to vary the output of a blower that provides cooling of the lamp. Thus, the operating point and color temperature of the projection lamp is accurately maintained in a closed loop arrangement by sensing the operating point of the lamp and controlling the blower output.

Abstract: A changeover control arrangement is provided for projection apparatus to allow two identical projection apparatus with identical changeover control arrangements and interconnected by a multi-conductor changeover interconnection cable to be utilized alternately and sequentially for multi-reel presentations or other projection formats requiring the operation of more than one projection apparatus.The changeover control arrangement of each projection apparatus includes a momentary actuated changeover control switch that is interconnected over the changeover interconnection cable to activate an illumination generating source; for example, an LED device. The illumination generating source has no electrical connections to the electrical or ground reference system of the projection apparatus in which the illumination generating source is physically disposed.

Abstract: One or more remote control arrangements are provided for interconnection to projector apparatus including local controls. Each of the remote control arrangements includes momentary actuated push-button controls for independently controlling the forward, reverse and stop drive modes and the on and off lamp status of the projection apparatus. Each of the remote control arrangements and the local control arrangement generate or synthesize a predetermined control signal corresponding to each of the drive modes and lamp status conditions from a signal waveform inputted to the remote control arrangements from the projection apparatus over one conductor of the interconnection cable between the projection apparatus and each of the remote control arrangements.

Abstract: The present invention provides a system for automatically focusing a projected film image by maintaining a predetermined distance along the optical axis between the emulsion on the surface of the film and the projection lens. The system includes a movable carriage for mounting the projection lens and an electro-optic sensor mounted for movement with the carriage for maintaining the predetermined distance. The electro-optic scanner includes a light source and lens assembly for focusing a beam of light onto the surface of the film and a lens for focusing the reflected image onto a dual phototransistor receptor. A servo-amplifier is connected to the output of the dual phototransistor to provide appropriate signals to the carriage drive mechanism to maintain said predetermined distance. The servo-amplifier utilizes both positional and rate feedback to provide faster operation and settling.

Abstract: A programmable, operator responsive, audiovisual teaching apparatus includes a rear screen projector for displaying visual information and an audio reproduction unit providing correlated audiovisual presentations in a sequence corresponding to a branched learning format. A microfiche storage element is provided with a plurality of informational units to be projected toward the screen, each unit including a visual portion, an encoded data portion, and an optical sound track portion. The coded data portion is projected onto a plurality of photodetectors mounted adjacent the screen and the optical sound track is projected onto a movable sound track transducer which provides the audio presentation. A plurality of manually operable switches are provided on the apparatus for selective actuation by the operator in an attempt to select a proper response to the audiovisual presentation.

Abstract: A playback preamplifier for use on a recording machine utilizing a magnetic recording medium to provide a substantially flat response between a general range of 200 to 6000 Hz. and having a substantially improved signal-to-noise ratio. The circuit includes a three stage amplifier having an overall DC feedback loop. The magnetic transducer is connected in the feedback loop so that the DC feedback current biases the transducer with the DC feedback current.