Kenneth William Crandall

US Patent:

7969161, Jun 28, 2011

Filed:

Dec 1, 2009

Appl. No.:

12/665514

Inventors:

Yashar Behzadi - San Francisco CA, US
Kenneth C. Crandall - Sunnyvale CA, US

Assignee:

Proteus Bomedical, Inc. - Redwood City CA

International Classification:

G01R 29/26
A61B 5/05

US Classification:

324613, 600547

Abstract:

Electrical tomography drive frequency selection systems and methods are disclosed. One aspect of the present invention pertains to a system for optimally selecting a drive frequency of an electrical tomography which comprises a sensor electrode stably associated with a tissue site within an internal organ of a subject for generating an induced signal based on a noise signal over a range of frequency bands, wherein an electrical field for the electrical tomography is turned off. In addition, the system comprises a noise processing module for isolating the induced signal for each frequency band over the range of frequency bands. Furthermore, the system comprises a frequency select module for selecting a drive frequency of the electrical field for the electrical tomography by comparing the induced signal for each frequency band over the range of frequency bands.

US Patent:

8487893, Jul 16, 2013

Filed:

May 16, 2011

Appl. No.:

13/108968

Inventors:

Kenneth Crandall - Sunnyvale CA, US
Michael Brosnan - Fremont CA, US
Jeffrey Stone - Fort Collins CO, US
Thomas Murphy - Boulder Creek CA, US

Assignee:

Pixart Imaging, Inc. - Hsin-Chu

International Classification:

G06F 3/041

US Classification:

345173, 178 1806

Abstract:

Disclosed are capacitive touchscreen or touch panel systems, devices and methods which increase the dynamic range of touches that may be detected on a capacitive touch screen or touch panel. Increased dynamic range is provided by employing automatic gain control methodologies and circuitry to process signals corresponding to individual mutual capacitance cells in a touch screen or touch panel.

US Patent:

8576197, Nov 5, 2013

Filed:

May 16, 2011

Appl. No.:

13/108875

Inventors:

Kenneth Crandall - Sunnyvale CA, US
Michael Brosnan - Fremont CA, US
Sam Sen Li - Santa Cruz CA, US

Assignee:

Pixart Imaging, Inc. - Hsin-Chu

International Classification:

G06F 3/045

US Classification:

345174

Abstract:

Disclosed are various embodiments of a capacitive touchscreen or touch panel system comprising a controller operably connected to a first plurality of drive electrodes and a second plurality of sense electrodes. The controller includes a noise disruption detector circuit, a user noise source detector/anticipator circuit, clock control logic circuitry operably connected to the noise disruption detector circuit and to the user noise source detector/anticipator circuit, at least one static-clocked digital filter circuit operably connected to and controlled by the clock control logic circuitry, a central processing unit (CPU) operably connected to the clock control logic circuitry, firmware operably connected to the CPU; and touch position circuitry configured to deliver signals indicative of touch positions on the touchscreen to a host controller. The controller is configured to employ at least one of the CPU and the firmware to cause the clock control logic circuitry to inhibit operation of the digital filter circuit in response to a signal representative of excessive noise levels being provided by either the noise disruption detector circuit or the user noise source detector/anticipator circuit.

US Patent:

20090135886, May 28, 2009

Filed:

Nov 26, 2008

Appl. No.:

12/324798

Inventors:

Timothy Robertson - Belmont CA, US
Kenneth C. Crandall - Sunnyvale CA, US
Lawrence W. Arne - Redwood City CA, US

International Classification:

H04B 1/00

US Classification:

375133, 375E01033

Abstract:

Transbody communication systems employing communication channels are provided. Various aspects include, for example, an in vivo transmitter to transmit an encoded signal; a transbody functionality module to facilitate communication of the encoded signal; and a receiver to receive the encoded signal. Methods and apparatus are also provided.

US Patent:

20120182252, Jul 19, 2012

Filed:

Jan 17, 2011

Appl. No.:

13/007995

Inventors:

Michael Brosnan - Fremont CA, US
Kenneth Crandall - Sunnyvale CA, US

Assignee:

Avago Technologies ECBU IP (Singapore) Pte. Ltd. - Fort Collins CO

International Classification:

G06F 3/045

US Classification:

345174

Abstract:

Various embodiments of differential cells for touchscreens or touch panels in capacitive sensing systems are disclosed. The differential circuit topologies of individual cells forming an array of such cells in a touchscreen or touch panel are configured to cancel common mode noise appearing on the multiple sense lines contained in each cell, and can result in lower power consumption, enhanced touch or near-touch sensitivity for a touchscreen or touch panel, and increased immunity from noise.

US Patent:

43353541, Jun 15, 1982

Filed:

Apr 4, 1980

Appl. No.:

6/137488

Inventors:

Kenneth C. Crandall - Foster City CA
Michael A. Robinton - Palo Alto CA

Assignee:

Robinton Products, Inc. - Sunnyvale CA

International Classification:

H03D 300

US Classification:

329126

Abstract:

A demodulator for frequency shift keyed carrier signals is described. A conditioned F. S. K. signal is simultaneously fed to a pair of rising edge triggered single shot voltage generators, such carrier signal being inverted prior to being fed to one of such single shots. The single shots are each triggered upon receipt of a cycle edge to initiate an output pulse having a duration falling between the time intervals distinctive of the cycles of the two possible carrier signal frequencies. The next rising edge received by each causes the respective single shots to retrigger, and latches the previous output of each into the first element of an associated serial memory device. The successive elements of each of the serial memory devices, store the state output signals of adjacent cycles of the carrier signal, with the states in one of such devices being one-half cycle apart from the states in the other. The outputs of all the elements of the two serial storage devices are connected to corresponding inputs of a majority logic gate, and such elements are triggered simultaneously to furnish output signals to such majority logic gate upon receipt of a carrier signal rising edge. The result is that the majority logic gate produces a demodulated digital output signal which is representative of the digital states of a majority of the carrier signal cycles examined.

US Patent:

53829140, Jan 17, 1995

Filed:

May 5, 1992

Appl. No.:

7/879966

Inventors:

Robert W. Hamm - Pleasanton CA
Kenneth R. Crandall - Corrales NM
James M. Potter - Los Alamos NM

Assignee:

AccSys Technology, Inc. - Pleasanton CA

International Classification:

H01J 2510

US Classification:

315505

Abstract:

A compact proton-beam therapy linac utilizing a linear, cascaded organization including a proton source, a radio-frequency-quadrupole (RFQ) linac coupled to the output of the source, a stepped-frequency (around 500- to around 100-MHz), low-peak-beam-current (around 100- to around 300-. mu. A) drift-tube linac (DTL) coupled to receive the output of the RFQ, and a plural-stage, low-peak-beam-current stage-switchable, side-coupled linac (SCL) coupled to the output of the DTL for producing the ultimate output proton-therapy beam.

US Patent:

59955538, Nov 30, 1999

Filed:

Jan 28, 1997

Appl. No.:

8/789296

Inventors:

Kenneth Crandall - Redwood City CA
Kenneth Fesler - Stanford CA

Assignee:

TFT, Inc. - Santa Clara CA

International Classification:

H04L 2710

US Classification:

375272

Abstract:

An encoder/decoder for an emergency alert system to enable broadcasters to receive, store, re-broadcast and originate emergency alert messages. Multiple emergency alert signals are received by the encoder/decoder. A digital signal processor of the encoder/decoder scans the reception of the multiple emergency alert messages to determine the presence of an incoming emergency alert signal. The digital signal processor provides digital implementation of a frequency shift key modulation and a frequency shift key demodulation to encode and decode emergency alert messages. Additionally, the digital signal processor functions as a central processing unit to control input/output ports over a digital signal processor bus for performing all encoding and decoding functions and to control all encoding and decoding functions.