Motorola

About: Motorola is a company organization based out in Schaumburg, Illinois, United States. It is known for research contribution in the topics: Signal & Communications system. The organization has 27298 authors who have published 38274 publications receiving 968710 citations. The organization is also known as: Motorola, Inc. & Galvin Manufacturing Corporation.

A New Preferential Etch for Defects in Silicon Crystals

Abstract: A new preferential etch for (100) and (111) oriented, p‐ and n‐type silicon has been developed. Oxidation‐induced stacking faults, dislocations, swirl, and striations are clearly defined with minimum surface roughness or extraneous pitting. A relatively slow etch rate (∼1 μm per min) at room temperature provides etch control. The long shelf life of this etch allows the solution to be stored in large quantities.

Performance modeling of asynchronous data transfer methods of IEEE 802.11 MAC protocol

Abstract: To satisfy the needs of wireless data networking, study group 802.11 was formed under IEEE project 802 to recommend an international standard for Wireless Local Area Networks (WLANs). A key part of standard are the Medium Access Control (MAC) protocol needed to support asynchronous and time bounded delivery of data frames. It has been proposed that unslotted Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) be the basis for the IEEE 802.11 WLAN MAC protocols. We conduct performance evaluation of the asynchronous data transfer protocols that are a part of the proposed IEEE 802.11 standard taking into account the decentralized nature of communication between stations, the possibility of “capture”, and presence of “hidden” stations. We compute system throughput and evaluate fairness properties of the proposed MAC protocols. Further, the impact of spatial characteristics on the performance of the system and that observed by individual stations is determined. A comprehensive comparison of the access methods provided by the 802.11 MAC protocol is done and observations are made as to when each should be employed. Extensive numerical and simulation results are presented to help understand the issues involved.

Passivation of organic devices

Abstract: A method of passivating organic devices (12) positioned on a supporting transparent plastic substrate (11) including the steps of overcoating the plastic substrate with a multi-layer overcoating (16), composed of alternating layers of a transparent polymer film (17) and a transparent dielectric material (18), forming an organic device (12) on the overcoated transparent plastic substrate (11) and sealing the organic device (12) formed on the overcoated plastic substrate (11). The polymer film layer (17) used in overcoating the plastic substrate acts as a means of improving the barrier properties of the multi-layer overcoating (16) and the dielectric material (18) acts as a physical barrier to atmospheric elements which can corrode the organic device (12) and are a detriment to the reliability of organic LEDs.

Entering a character into an electronic device

Abstract: A method ( 300 ) for entering a character into an electronic device ( 100 ) is provided The method ( 300 ) includes displaying ( 301 ) input character keys ( 204 ) on a touch sensitive region ( 202 ) of a display screen ( 105 ) of the device ( 100 ), the keys identifying an associated character Next, a display step ( 309 ) shows at least one entered character in a display region ( 201 ) of the screen, the entered character having been selected by actuation of one of the character keys ( 204 ) Next, a group of potential subsequent characters that follow the entered character is predicted ( 311, 317 ) A second set of input character keys ( 205 ) identifying the potential subsequent characters is displayed ( 327 ) The second set of keys ( 205 ) are grouped together ( 323 ) such that their relative screen locations with respect to each other are different to that of corresponding keys in the first set of keys ( 204 ) Finally in receiving ( 303 ) and displaying steps ( 309 ), the potential subsequent characters are entered adjacent the entered character, the entering having been in response to actuation of one of the second set of keys ( 205 )

Noise suppression system

Abstract: An improved noise suppression system (400) is disclosed which performs speech quality enhancement upon speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The noise suppression system of the present invention includes a background noise estimator (420) which generates and stores an estimate of the background noise power spectral density based upon pre-processed speech (215), as determined by the detected minima of the post-processed speech energy level. This post-processed speech (255) may be obtained directly from the output of the noise suppression system, or may be simulated by multiplying the pre-processed speech energy (225) by the channel gain values of the modification signal (245). This technique of implementing post-processed signal to generate the background noise estimate (325) provides a more accurate measurement of the background noise energy since it is based upon much cleaner speech signal. As a result, the present invention performs acoustic noise suppression in high ambient noise backgrounds with significantly less voice quality degradation.