Abstract: A video system captures media such as images and video by tracking wearable devices of users, for example, at live events such as a music concert. The video system may determine location of the wearable devices by using infrared signals, radio frequency, or ultrasound signals detected by sensors installed at a venue of an event. Based on the locations of wearable devices and cameras, the video system generates commands to adjust orientation of one or more of the cameras to target a specific user for capturing video or images. For instance, a pan-tilt-zoom camera may be adjusted along multiple axis. The video system may notify users that video recording is ongoing, or that recording will start soon, by transmitting a command to wearable devices to emit a pattern of visible light.

Abstract: A system and method of producing an image using a plurality of independent pixel devices, each of which includes one or more light emitting or polarizing elements. The pixel devices are fixed (e.g. on the side of a building) or are moving (e.g. on water or falling in air) within an image space in which an image is to be formed. A controller determines, based upon the locations of the pixel devices within the image space, what portion of the image each pixel device is to reproduce, and then commands the pixel devices to use the emitting devices to reproduce the corresponding portion of the image. As the pixel devices move, the new locations of the pixel devices are mapped onto the image, and the control of the pixel devices is modified accordingly so that the image produced by the pixel devices is not distorted by their movement.

Abstract: A hybrid modulator apparatus includes a modulator that amplitude modulates a power supply signal. A correction circuit coupled in parallel with the modulator reduces errors caused by the modulator. In one embodiment the modulator includes a digital pulse-width modulator (PWM) and a buck converter. The K most significant bits (MSBs) of N-bit input digital words are used by the digital PWM and a buck converter to generate an amplitude modulated power supply signal having a plurality of quantized voltage levels. The remaining N?K bits of each N-bit words may be used to dither the input drive to the PMW, to produce an error signal at the output of the modulator representing quantization errors caused by only applying the K MSBs to the PWM. The correction circuit compares the error signal to a signal formed form all N bits of the N-bit words in reducing the quantization errors.

Abstract: A system, apparatus and methods are described that wirelessly communicate with its environment in response to stimuli generated locally within a communication device or within a remote activation device.

Abstract: A highly-efficient hybrid class-S modulator circuit for a polar modulator includes a class-S path having a digital pulse-width modulator (PWM) generator, which receives the K most significant bits (MSBs) of N-bit digital input words to generate a discrete set of PWM signals. The discrete set of PWM signals drives a buck converter, to provide a modulated power supply voltage signal having a plurality of quantized voltage levels. An error generated by using only K of the N bits of each N-bit word is reduced by dithering the input drive and converting the error to an AC signal. Dithering is performed by feeding the N?K least significant bits (LSBs) of each N-bit input word to an input of a digital oscillator, while feeding the K most significant bits (MSBs) of each word to the PWM generator. The digital oscillator converts the N?K LSBs of each input word into an oscillating single LSB.

Abstract: A system, apparatus and methods are described that wirelessly communicate with its environment in response to stimuli generated locally within a communication device or within a remote activation device.

Abstract: The present invention, generally speaking, provides a power-efficient method of driving a switch mode power supply at higher frequencies than those typically attainable in the prior art. In an exemplary embodiment, driver transistors exhibit gate capacitance, which is exploited by charging the gate capacitance using a pulse signal and thereafter allowing the gate capacitance to discharge. With the gate capacitance charged, the driver transistor remains on for the desired period of time even without a drive signal being continuously applied, thus conserving power. In essence, the gate capacitance is exploited in the manner of a memory cell. Furthermore, at higher-frequency operation, instead of the gate capacitance being fully charged, leading to increased turn-off time, the gate capacitance is only partially charged, allowing for quicker turn around. The envelope-following capability of the switch mode power supply, in telecommunications applications, is therefore increased.

Abstract: The present invention, generally speaking, provides a power-efficient method of driving a switch mode power supply at higher frequencies than those typically attainable in the prior art. In an exemplary embodiment, driver transistors exhibit gate capacitance, which is exploited by charging the gate capacitance using a pulse signal and thereafter allowing the gate capacitance to discharge. With the gate capacitance charged, the driver transistor remains on for the desired period of time even without a drive signal being continuously applied, thus conserving power. In essence, the gate capacitance is exploited in the manner of a memory cell. Furthermore, at higher-frequency operation, instead of the gate capacitance being fully charged, leading to increased turn-off time, the gate capacitance is only partially charged, allowing for quicker turn around. The envelope-following capability of the switch mode power supply, in telecommunications applications, is therefore increased.

Abstract: A system and method of producing an image using a plurality of independent pixel devices, each of which includes one or more light emitting or polarizing elements. The pixel devices are fixed (e.g. on the side of a building) or are moving (e.g. on water or falling in air) within an image space in which an image is to be formed. A controller determines, based upon the locations of the pixel devices within the image space, what portion of the image each pixel device is to reproduce, and then commands the pixel devices to use the emitting devices to reproduce the corresponding portion of the image. As the pixel devices move, the new locations of the pixel devices are mapped onto the image, and the control of the pixel devices is modified accordingly so that the image produced by the pixel devices is not distorted by their movement.