Abstract: A charging frequency between a transmitting coil and a receiving coil of a wireless power transfer (WPT) system is found by setting an input voltage to the transmitting coil at a fixed voltage, shunting the receiving coil, determining a first input current frequency range in which a resonant frequency is expected to be found, frequency polling within the first input current frequency range using a set of polling frequencies in the first input current frequency range, and selecting as the charging frequency a polling frequency having a lowest input current. The first input current frequency range may be found by setting the first input current frequency range based on regulation, international electromagnetic frequency allotments, or prior experience with WPT between the transmitting coil and the receiving coil. A frequency range around the input current minima is selected to poll for a charging frequency that approximates the resonant frequency.

Abstract: An audio analysis and processing system with a processor configured with an audio array input thread connected to a plurality of audio input channels each corresponding to an audio input sensor. An audio input sensor may be positionally related to a position of other audio input sensors and a source input thread may be configured to be connected to a microphone audio input channel. An audio output thread may be configured to be connected to a speaker output channel and a beamformer thread may be responsive to the audio array input thread. A beam analysis and selection thread may be connected to an output of the beamformer thread and a mixer thread may have a first input connected to an output of the source input thread and a second input connected to an output of the beam analysis and selection thread and may have an output connected to the audio output thread. The audio input channel may be connected to the personal communication device.

Abstract: An audio analysis and processing system with a processor configured with an audio array input thread connected to a plurality of audio input channels each corresponding to an audio input sensor. An audio input sensor may be positionally related to a position of other audio input sensors and a source input thread may be configured to be connected to a microphone audio input channel. An audio output thread may be configured to be connected to a speaker output channel and a beamformer thread may be responsive to the audio array input thread. A beam analysis and selection thread may be connected to an output of the beamformer thread and a mixer thread may have a first input connected to an output of the source input thread and a second input connected to an output of the beam analysis and selection thread and may have an output connected to the audio output thread. The audio input channel may be connected to the personal communication device.

Abstract: An audio analysis and processing system with a processor configured with an audio array input thread connected to a plurality of audio input channels each corresponding to an audio input sensor. An audio input sensor may be positionally related to a position of other audio input sensors and a source input thread may be configured to be connected to a microphone audio input channel. An audio output thread may be configured to be connected to a speaker output channel and a beamformer thread may be responsive to the audio array input thread. A beam analysis and selection thread may be connected to an output of the beamformer thread and a mixer thread may have a first input connected to an output of the source input thread and a second input connected to an output of the beam analysis and selection thread and may have an output connected to the audio output thread. The audio input channel may be connected to the personal communication device.

Abstract: A beamforming apparatus may have a domain conversion stage converting a plurality of time domain signals representing audio information to a plurality of frequency domain signals representing said audio information, a bandpass filter stage having a plurality of inputs connected to the frequency domain signals and having a plurality of outputs. A beamformer filter stage may have a plurality of inputs corresponding to the of outputs of the bandpass filter stage and a plurality of outputs. An inverse domain conversion stage, converting a plurality of inputs corresponding to outputs of the beamformer filter stage from frequency domain signals to time domain signals and having a plurality of outputs connected to an output stage.

Abstract: An audio analysis and processing system with a processor configured with an audio array input thread connected to a plurality of audio input channels each corresponding to an audio input sensor. An audio input sensor may be positionally related to a position of other audio input sensors and a source input thread may be configured to be connected to a microphone audio input channel. An audio output thread may be configured to be connected to a speaker output channel and a beamformer thread may be responsive to the audio array input thread. A beam analysis and selection thread may be connected to an output of the beamformer thread and a mixer thread may have a first input connected to an output of the source input thread and a second input connected to an output of the beam analysis and selection thread and may have an output connected to the audio output thread. The audio input channel may be connected to the personal communication device.

Abstract: A microphone array may include a microcontroller having a plurality of ports, a plurality of microphones connected to the ports, and a position sensor connected to a port of the microcontroller. The microcontroller may be responsive to a clock signal and the microcontroller may include a data output as a universal serial bus output. Two microphones may be connected to a single port of the microcontroller. The microphones may be equally spaced around the circumference of the circle. The microphones may be located in a known relative position to one or more other microphones of the microphone array. The microphone array may be positioned in a fixed relative position to the position sensor. The microphones may be connected to an I2S port of the microcontroller. A position sensor may be connected to the microcontroller at an I2C port. Traces connecting the microphones to the microcontroller may be substantially equal in length. The microphones may have a digital input.

Abstract: A beamforming apparatus may have a domain conversion stage converting a plurality of time domain signals representing audio information to a plurality of frequency domain signals representing said audio information, a bandpass filter stage having a plurality of inputs connected to the frequency domain signals and having a plurality of outputs. A beamformer filter stage may have a plurality of inputs corresponding to the of outputs of the bandpass filter stage and a plurality of outputs. An inverse domain conversion stage, converting a plurality of inputs corresponding to outputs of the beamformer filter stage from frequency domain signals to time domain signals and having a plurality of outputs connected to an output stage.