Abstract: A transmit signal generator is provided. The transmit signal generator has an n?1 bit comparator having a first set of n?1 input lines and a second set of n?1 input lines and an output line, the n?1 bit comparator operable to compare signals of the first set of n?1 input lines and signals of the second set of n?1 input lines and provide the output of the n?1 bit comparator based on the comparison, and an n-bit binary counter having a clock signal input line, a reset signal input line, a clock enable line connected to the output line of the n?1 bit comparator, and n output lines. One of the n output lines provides a sequence of pulse as an output of the transmit signal generator.

Abstract: A transmit signal generator is provided. The transmit signal generator has an n?1 bit comparator having a first set of n?1 input lines and a second set of n?1 input lines and an output line, the n?1 bit comparator operable to compare signals of the first set of n?1 input lines and signals of the second set of n?1 input lines and provide the output of the n?1 bit comparator based on the comparison, and an n-bit binary counter having a clock signal input line, a reset signal input line, a clock enable line connected to the output line of the n?1 bit comparator, and n output lines. One of the n output lines provides a sequence of pulse as an output of the transmit signal generator.

Abstract: A method and apparatus of generating a sequence of pulses by a transmit signal generator. The transmit signal generator has a multiplexer that is connected to a binary counter and one of the output lines of the binary counter provides the sequence of pulses.

Abstract: A method and apparatus of generating a sequence of pulses by a transmit signal generator. The transmit signal generator has a multiplexer that is connected to a binary counter and one of the output lines of the binary counter provides the sequence of pulses.

Abstract: A device having a vibration based propulsion system includes at least one of an extendible and retractable diaphragm, a vibrating mechanism, and an expandable and collapsible body section for driving movement of the device. Some embodiments may also include one or more coverings configured to move to adjust the fluid resistance of the device to improve the efficiency of the device's movement. At least one processor may be connected to at least one of: a transceiver, sensors, a camera, and a drive system for controlling the operations of these mechanisms. A power source may also be attached to these elements of the device to power the device. A remote controller or other computer device may communicate with the device via the transceiver to provide input for steering the device or to receive data collected by the device.

Abstract: An example ultrasound device, such as a transducer array, includes a plurality of ultrasound transducers, each ultrasound transducer having a first electrode, a second electrode, a thin piezoelectric film located between the electrodes, and a substrate supporting the plurality of ultrasound transducers. In some examples, the electrode separation is less than 10 microns, facilitating lower voltage operation than conventional ultrasound transducers.

Abstract: A device having a vibration based propulsion system includes at least one of an extendible and retractable diaphragm, a vibrating mechanism, and an expandable and collapsible body section for driving movement of the device. Some embodiments may also include one or more coverings configured to move to adjust the fluid resistance of the device to improve the efficiency of the device's movement. At least one processor may be connected to at least one of: a transceiver, sensors, a camera, and a drive system for controlling the operations of these mechanisms. A power source may also be attached to these elements of the device to power the device. A remote controller or other computer device may communicate with the device via the transceiver to provide input for steering the device or to receive data collected by the device.

Abstract: An example ultrasound device, such as a transducer array, includes a plurality of ultrasound transducers, each ultrasound transducer having a first electrode, a second electrode, a thin piezoelectric film located between the electrodes, and a substrate supporting the plurality of ultrasound transducers. In some examples, the electrode separation is less than 10 microns, facilitating lower voltage operation than conventional ultrasound transducers.

Abstract: A redundant-source clock generator has only two oscillators, rather than three oscillators. A secondary oscillator is phase-locked to a primary clock from a primary oscillator using a phase detector, charge pump, and filter that generate a control voltage to the secondary oscillator that determine the frequency of a secondary clock. The primary clock is compared to the secondary clock to detect primary clock failure. When clock failure is detected, a mux is switched to select a delayed secondary clock rather than a delayed primary clock to output as a system clock. Since the mux receives delayed clock signals, clock-failure detection has additional time to detect the clock failure before the clock failure is propagated through the mux. When the primary oscillator fails and the clock failure is detected, the phase detector stops comparing a feedback secondary clock to the primary clock and instead holds the control voltage steady.