Abstract: A network for electronic communications in which disparate anonymous devices may transmit and receive information, such as in a secure manner. A method for collecting health-related data may, for example, comprise detecting, at a first time, that a sensor has moved within a detection range of a link component, the sensor having not been identified to the link component prior to the first time; receiving data collected by the sensor relating to activity by and/or health of a human subject associated with the sensor; and processing the data to determine at least one indicator of the human subject's health.

Abstract: Low-data-rate device-to-device communications may be established via at least one intermediate audio link Non-audio data may be encoded onto an audio data stream. The audio data stream may be converted to a non-audio data stream, e.g., an RF data stream, for wireless transmission to a second device. The second device may receive the wireless data stream. The second device may further decode a replica of the original non-audio data from the audio stream. Device-to-device communications employing an intermediate audio link may be used for communications between low-processing power devices, e.g., sensors and monitors, and more sophisticated processors, e.g., cell phones, computers, PDA's, tablets. Intermediate audio links may be useful for health and industrial applications. Low-power network protocols may also be used to establish a network of devices that use at least one intermediate audio link.

Abstract: A network for electronic communications in which disparate anonymous devices may transmit and receive information, such as in a secure manner. A method for collecting health-related data may, for example, comprise detecting, at a first time, that a sensor has moved within a detection range of a link component, the sensor having not been identified to the link component prior to the first time; receiving data collected by the sensor relating to activity by and/or health of a human subject associated with the sensor; and processing the data to determine at least one indicator of the human subject's health.

Abstract: A counterfeit coin detector circuit comprising an constant frequency and voltage maxima and minima square wave oscillator input to a tank circuit including an inductive probe and an adjustable capacitance. The tank circuit is driven at a fixed and stable frequency and has a variable peak to peak AC output voltage amplitude which is a function of the characteristics of the coin under test. The AC output of the tank circuit is converted to a DC voltage correlated to the peak to peak AC ouput from the tank circuit. A group of window detector circuits are employed to determine whether the DC voltage output falls within certain preset ranges corresponding to the presence of particular coins. The presence or absence of a window detect can be used to accept or reject the coin or to otherwise take appropriate action with respect to the coin under test.