Abstract: A screen assembly for a rear projection television set, including a frame portion extending about a viewing portion thereof, the viewing portion defining a lenticular screen. The frame and viewing portions may be formed as one piece, for example from injection molded plastic. The screen assembly includes a fastener for mounting the lenticular screen to a projection television set over an opening therein, and preferably for slidably mounting the lenticular screen in a focal plane thereof. The fastener may include slots extending horizontally along upper and lower regions of the frame portion for receiving slide rails attached to the television set. A set of projection tubes and a mirror mounted in the television set project a viewable image onto the lenticular screen.

Abstract: Methods and apparatus for use in communication between a remote control and a receiving unit provide power saving modes of operation and enable remote control use of high data generating devices, such as a trackball. A pulse position modulation protocol is provided in which the position of a single pulse, such as an infrared pulse is located in time in one of three or more locations. In the preferred embodiment, the pulse is provided at least in one of eight states, and more preferably in one of sixteen states. In the latter arrangement, a single bit provides for a hex data output by a single pulse. In this way, a single pulse may substitute for what otherwise would have been multiple pulses in a binary protocol. Power savings may be achieved through this method. A time base compensation method is provided in which the remote control provides two detectable events separated by a predetermined time as measured by the remote control time base or clock.

Abstract: Apparatus is provided for presentation of images from multiple sources on a monitor or television at the same time. In the preferred embodiment, the system comprises a picture-in-picture display, wherein a main picture has overlayed on it a picture-in-picture (PIP) occupying a minor portion of the main picture. In one mode of operation, called a review mode, the PIP displays the channel which had been displayed on the main picture prior to the channel change. In another mode of operation, called the preview mode, the main picture is selected by operation of a channel selection device, such as an up channel selector, and the PIP contains the next sequential channel in the list associated with that channel selection device. Such a list may be predefined, such as in the case of sequential channel selection either in an up or a down direction, or by use of a favorite channel list.

Abstract: A converter for converting video signals of an interlace format to video signals of a progressive format includes an intra-field converter and an adaptive temporal filter. The intra-field converter intra-field converts a video signal of the interlace format into a video signal of the progressive format. The adaptive temporal filter temporally filters the video signal of the progressive format such that as a degree of image movement in images represented by said video signal of said progressive format increases, a lesser degree of temporal filtering is performed.

Abstract: A class 1 cellular mobile telephone apparatus has an LCD display and keypad provided in a transceiver main unit, which can be installed directly in a passenger compartment of a motor vehicle. The handset unit contains only a speaker and a microphone, eliminating the need for a microprocessor and associated supporting circuitry. The additional space within the handset is utilized for placement of a battery pack power supply for transportable operation of the apparatus. The apparatus is smaller, simpler and lighter in weight than conventional class 1 cellular apparatus.

Abstract: An enclosure for housing electronic circuitry and the like, having a case and a cover which are mated together along edges thereof by substantially C-shaped flanges oriented in the same direction and asymmetrically with respect to each other to form semi-interlocking joints. Assembly and disassembly of the joints is accomplished by direct insertion and extraction without the need for sliding motion. The mating elements are locked together through the use of fasteners inserted into circular recesses formed by the flange members. The construction enables the use of internal dividing walls and shielding gaskets for forming electromagnetically isolated compartments within the housing enclosure.

Abstract: A system for controlling the power level of RF signals output by a portable radio transmitter having a first voltage supply, a first amplifier stage and a microcomputer coupled to the first amplifier stage for selecting one of a set of power levels. An indicator signals when the radio transmitter is coupled to a vehicular voltage supply and, in response, the microcomputer generates a control signal representative of a desired power level. A second amplifier stage is coupled to the first amplifier stage and receives RF signals at the selected power level. A constant gain control circuit coupled to the second amplifier stage receives the control signal and responds by setting the gain of the second amplifier stage at one of at least two constant gain values so that the output RF signals are provided with the desired power level.