Abstract: A digital storage stethoscope is provided. The digital storage stethoscope includes a noise canceling microphone apparatus configured to detect an analog signal from a sound generating source, an amplifier electrically connected to the noise canceling microphone apparatus and configured to amplify and add electrical gain to the analog signal from the noise canceling microphone apparatus, an analog to digital converter electrically connected to the amplifier and configured to: a) receive the analog signal, b) convert the analog signal to a digital signal, and c) add digital gain to the digital signal, a controller electrically connected to the converter and configured to receive the digital signal from the converter into a data file, a memory storage electrically connected to the controller for storing the data file, and a data transmitter electrically connected to the controller and being configured to transmit the data file from the controller.

Abstract: A remotely activated control device responsive to a specific transmitter operating in a frequency band assigned to radio telephone equipment, such as cellular telephone networks, cordless telephones, etc. The control device includes a radio receiver which provides a received pulse train to an assurance logic circuit. The assurance logic circuit determines if the received pulse train is limited to no more than a transmitter identification code and an action code, the combination of which is less than the code required to activate a relay network or initiate a radio telephone connection. Pulse trains accepted by the assurance logic circuit are compared to a stored code by a comparitor. The stored code includes the identification of a specific transmitter or group of transmitters and at least one action code. If the received pulse train matches the stored code, a switching circuit is activated to control a user supplied device.

Abstract: A remotely activated control device responsive to a specific transmitter operating in a frequency band assigned to radio telephone equipment, such as cellular telephone networks, cordless telephones, etc. The control device includes a radio receiver which provides a received pulse train to an assurance logic circuit. The assurance logic circuit determines if the received pulse train is limited to no more than a transmitter identification code and an action code, the combination of which is less than the code required to activate a relay network or initiate a radio telephone connection. Pulse trains accepted by the assurance logic circuit are compared to a stored code by a comparitor. The stored code includes the identification of a specific transmitter or group of transmitters and at least one action code. If the received pulse train matches the stored code, a switching circuit is activated to control a user supplied device.