Abstract:
Two-dimensional semiconductor chips (11-1, 11-2) are stacked to form a three-dimensional array in which coupling between chips is affected optically (22, 23, 24). This permits the use of smaller chips, with a corresponding higher yield, and serves to reduce the chip area required for interconnecting leads. It also reduces the internal interconnection path lengths which, at present, limit the speed of operation.
Abstract:
Method for avoiding accessing of defective locations in disks and other storage media. A disk file controller (12) uses manufacturer-provided information about the location of defects to construct a sequentially ordered list of addresses of defective storage locations in the disk, and the list is stored in a table in the disk. During use of the disk (13), the disk file controller reads the table of defects into its memory (15), and uses it to translate virtual addresses into real addresses. The translation process skips over real addresses of defective locations. The virtual addresses are translated into a real address by being incremented by the number of defects whose addresses are lower than the real address. Subsequent contiguous virtual addresses are translated into real addresses by being incremented by the number of contiguous defective locations that follow the location associated with the preceding virtual address. Addresses of new defects found during use of the disk are stored by the disk file controller in temporary storage on the disk and are incorporated into the defect table when the disk is taken out of service.
Abstract:
A connector (100) has cross-connect terminals (122) which interconnect telephone central office wiring and outside plant wires. The connector (100) consists of two connector units (101, 102) arranged in mirror relationship. The connector (100) is totally front-facing and has designation dividers (125, 131) to facilitate identification of the cross-connect terminals (122) and associated protector modules (108).
Abstract:
The present apparatus for controlling the application of telephone line power in a telephone set has obviated the requirement for a local source of power at the premises of a telephone customer. A data processor-based telephone set incorporating the present invention comprises a power supply having first and second voltage storage devices (C401, C402) which accumulate charge from the telephone line. First and second regulator circuits (410, 420) regulate the charging of the voltage storage devices and the power distribution to power-consumptive components of the telephone set during on-hook and off-hook switchhook conditions. A voltage threshold detector (301) actuates a power-down of power consumptive components including the data processor (210) when the power supply voltage falls below a particular threshold value. In the meantime, power is continuously provided to certain essential components such as the volatile memory (220) of the data processor. A telephone impedance switch (202) under data processor control intentionally increases the resistance of the telephone set so that the telephone line voltage delivered to the telephone set is increased, the increased voltage powering certain components of the telephone which require the higher voltage level for proper operation.
Abstract:
A high frequency induction furnace (10) for reflowing a portion of a lightguide preform (44) in order to draw a fiber (52) therefrom. The furnace (10) has a centrally located tubular susceptor (34) therein. A high frequency coil (38) is energized to couple its elecromagnetic field to the susceptor (34) to heat and reflow a portion of the preform (44) in order to draw the fiber (52) therefrom. The susceptor has a thin coating of the preform material (e.g., silica) on at least a portion of the inside surface thereof. In a further embodiment a cylinder (62) is positioned in concentric, spaced relation about the susceptor (34) and is surrounded by an insulating grain (36). A thin coating of the preform material may be additionally provided on at least a portion of either the outer surface of the susceptor or the inner surface of the cylinder. The thin coating prevents contaminating particulates from migrating from small cracks in the inside surface of the susceptor (34) onto the preform (44) while the cylinder (62) prevents small particulate emanating from the insulating grain (36) from being drawn through larger cracks in the susceptor and onto the preform and/or the fiber (52).
Abstract:
Low temperature sintering of grade materials sintered to 99 percent of the theoretical density is described using TiO2 powder prepared by hydrolyzing titanium isopropoxide and sintering at 850oC.
Abstract:
In generally known segmented plasma excitation and recombination type of light sources, comprising spaced apart metal strips (101-110) capable of generating a high-density metal-vapor ion plasma (141-149) when an electrical voltage (130) is applied across the strips, the use of strip materials formerly not usable in such devices is made possible by using strips which are significantly thinner (e.g., 10 times thinner) than previously used.
Abstract:
Un photodétecteur fournissant une amplification électrique de faible bruit du signal lumineux détecté comprend un étage à photodiode qui consiste en une couche de siliciure (12) formant une jonction de barrière Schottky avec un substrat de silicium (11) et qui est intégré avec un étage d'amplification utilisant un transistor au silicium (13, 14, 19) adapté pour amplifier la tension photovoltaïque dérivée par l'étage à photodiode. Dans un mode préférentiel de réalisation, la couche de siliciure forme la grille d'un transistor à base perméable.
Abstract:
Un affichage à panneau au plasma à courant alternatif (100) présente des aptitudes au décalement sélectif des rangées et des colonnes. Les conducteurs alternés de colonnes (C2, C4...,C512) sont communs entre une région de transfert (11) et une région d'exposition (12) tandis que les autres conducteurs de colonnes (C1, C3..., C511) dans la région de transfert se terminent à la frontière entre les deux régions. Le décalage des rangées s'effectue dans la région de transfert pour entrer les données d'affichage sur le panneau. Le décalage des colonnes est utilisé entre les deux régions pour acheminer les données d'affichage vers la région d'exposition depuis la région de transfert. La terminaison des autres conducteurs de colonnes en-deçà de la région d'exposition permet le décalage latéral des données par l'intermédiaire de la région de transfert sans qu'il y ait de décalage semblable des données dans la région d'exposition.
Abstract:
Frequency-hopped single sideband (SSB) mobile radio system implemented by hopping the carrier frequency of an input signal (s(t)) every tau seconds. The hopping is controlled by a carrier-frequency-hopped sequence (fi(t)) generatd by a carrier-frequency-hopping generator (16, 24). When employed in a frequency-hopped SSB transmitter (10), the carrier sequence functions to modulate the input signal, "hopping" it to a different carrier frequency every tau seconds. The carrier-frequency-hopped SSB receiver employs the identical carrier sequence as used by the transmitter to demodulate the transmitted carrier-frequency-hopped SSB signal, thereby recovering the original single sideband signal (s(t)). By frequency hopping the carrier signal of an SSB signal, the present invention mitigates the effects of co-channel interference and frequency selective fading inherent in prior art SSB cellular mobile radio systems.