摘要:
A system includes long-term storage (e.g., flash memory) for storing sensitive data and critical components of a consumer electronic (CE) device such as an operating system (OS) kernel, private cryptographic key values, security applications, and firmware configurations, for example. Security hardware/software designates and restricts access to secured portions of long-term storage that contain the critical components. Requests for access to these secured portions are addressed by the security hardware/software, which authenticates a cryptographic authorization code received with the request. Read-write access to the secured portions is allowed for download and installation of, for example, a software or firmware upgrade if the cryptographic authorization code is authenticated.
摘要:
A clock including: a portable, at least partially evacuated housing; a cell being positioned within the housing and including an internal cavity having interior dimensions each less than about 1 millimeter, an intra-cavity pressure of at least about 760 Torr, and containing a metal atomic vapor; an electrical to optical energy converter being positioned within the housing to emit light through the metal atomic vapor; an optical energy intensity detector being positioned within the housing to receive the light emitted by the converter through the metal atomic vapor; at least one conductive winding around the cavity to stabilize the magnetic field experienced in the cavity dependently upon the detector; and, an output to provide a signal from the housing dependently upon the detector detecting the light emitted by the converter through the metal atomic vapor.
摘要:
The present invention provides a system and method for achieving a calibration-free primary atomic clock standard operating at the 0-0 transition free-atom frequency, thus creating a primary frequency standard, with attributes that include scalable to chip-scale dimensions and power consumption.
摘要:
A method is provided for transcoding between video signals in two standards, DV and MPEG-2, each standard including discrete cosine transform (DCT) compressed signals. The each of the signals have macroblocks containing a plurality of DCT blocks. The DCT blocks are quantized according to respective quantization methods defined by the standards. The coefficients in each block are zigzag scanned, run-length coded and variable-length coded. The process variable-length decodes the coefficients and translates the quantized coefficients in the DV standard into quantized coefficients in the MPEG standard without fully dequantizing at least some of the DV coefficients and without performing an inverse DCT operation on any of the DCT coefficients. DV blocks that are encoded in a 248 format are translated into an 88 format before they are converted to MPEG-2 blocks. A method for transcoding from MPEG-2 to DV is also described. The MPEG-2 signals are intra-frame encoded, have a 4:2:2 chrominance format and an 88 frame-encoded block format. According to this method, converted 88 DV blocks that represent significant intra-field motion are converted from the 88 format to a 248 format. The method also controls which overflow coefficients in the DV signal are transcoded into corresponding coefficients in the MPEG-2 signal to control the data rate of the MPEG-2 signal.
摘要:
The invention is a method and apparatus for generating terahertz radiation. The terahertz source is a versatile terahertz device that can be configured to transmit a plurality of wavelengths, thereby facilitating the detection of multiple contaminants using a single source device. In one embodiment, the Smith-Purcell radiation effect is exploited by passing an electron beam over a modulated conducting surface, wherein the spacing of the periods of the modulated surface is varied. The variations in the modulated surface enable the source to produce light of varying wavelengths.
摘要:
A cell suitable for use with an atomic clock and a method for making the same, the cell including: a silicon wafer having a recess formed therein; at least one amorphous silicate member having an ion mobility and temperature expansion coefficient approximately that of silicon sealing the recess; and, an alkali metal containing component and buffer gas contained in the recess. The method includes: providing a silicon wafer; forming a cavity through the silicon wafer; introducing an alkali metal containing component and buffer gas into the cavity; and, anodically bonding at least one amorphous silicate member having an ion mobility and temperature expansion coefficient approximately that of silicon to the wafer to close the cavity.
摘要:
A system (300) for combining a panning camera (308) with one or more displays (304), such as head-mounted displays, is provided. A panoramic view from an electronic panning camera may be provided to an electronic panning control circuit (510). The electronic panning control circuit may be responsive to a view selector (306), such as a head-tracker located on a user's HMD. The electronic panning circuit selects the desired portion of the panoramic view to send to the user's display. A stereoscopic, view providing for a depth-of-field effect simulating actual vision, stereo view is achieved by locating a first electronic panning camera (502) in an optically horizontally offset relation with a second electronic panning camera (504). An image splitter (510), such as a half silvered mirror, sends the same, slightly horizontally offset, to both cameras. Individually pannable views may be delivered to users via a communications network (312). One or more electronic panning cameras may output stereoscopic views to a communications network using high bandwidth lines (because the electronic panning cameras typically output a signal having a bandwidth equivalent to several video signals). The panoramic views may be received by local central offices (806) which include electronic panning circuits responsive to users' HMDs. The desired portions of the stereoscopic view may be extracted and sent to the user via conventional video bandwidth lines (because the selected views are typically equivalent to one or two video signals).
摘要:
A high power laser system including: a plurality of emitters each including a large area waveguide and a plurality of quantum well regions optically coupled to the large area waveguide, wherein each of the quantum well regions exhibits a low modal overlap with the large area waveguide; a collimator optically coupled to the emitters; a diffraction grating optically coupled through the collimator to the emitters; and, an output coupler optically coupled through the diffraction grating to the emitters.
摘要:
A compact signal source including: a semiconductor-based, pulsed optical energy source for providing a series of pulses at a given frequency; a selector being optical fiber coupled to the pulsed optical energy source and for down-selecting the pulses to a lower frequency; a stretcher being optical fiber coupled to the selector and for temporally stretching the selected pulses; at least one semiconductor-based optical amplifier being optical fiber coupled to the stretcher and for amplifying the selected pulses; a compressor being optical fiber coupled to the at least one semiconductor-based amplifier and for temporally compressing the amplified, stretched, selected pulses; and, a portable housing containing the pulsed optical energy source, stretcher, at least one semiconductor-based optical amplifier and compressor.
摘要:
The present invention provides a system and method for achieving a calibration-free primary atomic clock standard operating at the 0-0 transition free-atom frequency, thus creating a primary frequency standard, with attributes that include scalable to chip-scale dimensions and power consumption.