Abstract: An electronic identification system having a portable identifier with the ability to transmit by radio or audio signal the contents of an included memory upon interrogation or command to identify the user. The identifier transmits a plurality of radio frequencies intermittently to represent the memory data in digital form. The transmitted data includes a description of the proper bearer of the identifier so that a local check can be made to ascertain that the identifier is being carried by the proper person. The reader system not only identifies the bearer, but also makes a proportional recording of the transmitted data. With dual receivers and dual receiving antennas together with the proportional recording, it is possible to determine the direction of movement of the identifier through a portal into a limited access area. With proportional recording it is also possible to analyze the memory data and separate the signals from several identifiers which may have been transmitted in a time overlapping manner.

Abstract: An electronic identification and recognition system in which the recognition portion includes a voltage controlled oscillator which sweeps over a range of frequencies. The identification portion resonates at certain frequencies determined by a variable reactance in the resonant circuit in the identifier which is responsive to bits from a sequential data register. The bits result in the on-and-off switching of the variable reactance which modifies the resonant frequency in the identification portion or modifies the frequency of an oscillator in the identification portion. The changes and sequence of changes in the resonant frequency are detected and recorded by the recognition portion such that the internal code of the identifier is determined.

Abstract: An automatic identification system wherein a portable identifier, preferably shaped like a credit card, incorporates an oscillator and encoder so as to generate a programmable pulse position-modulated signal in the radio frequency range for identification of the user. The identifier can be made to generate the identification signal constantly or can be made for stimulated transmission responsive to an interrogation signal. The identification signal can be preset or can be programmable by use of a programmable memory.

Abstract: A device mounted on and coupled to the body of the wearer for measuring and visually displaying the pulse rate or other body functions. A primary sensor is positioned on the skin at a position to sense arterial pressure variations and generate a pulse signal responsive thereto while a secondary sensor is positioned close by to generate signals due to extraneous influences of the body and environment. These extraneous signals are subtracted from the pulse signal to increase the accuracy thereof.

Abstract: A personal identifier comprising a portable device for generating a signal identifying the user. This identifier may be reprogrammed periodically by the user for protecting against unauthorized use or for sending special information. In addition the identifier can be energized to radiate a uniquely coded high energy signal to indicate the user needs emergency assistance and also includes a loudspeaker for transmitting the signal to a telephone receiver to allow communicating through the telephone system.

Abstract: An electronic identification and recognition system including a portable radio frequency signal generator having a circuit for repeatedly generating and transmitting an identifying signal having predetermined characteristics of frequency and pulse length.A single crystal determines the radio frequency signal and the two modulating square wave rates, and the bit data rate, so that synchronism with a remote receiver is readily obtained. A low level of transmitting power is chosen to allow non-interfering transmission on a variety of radio frequencies, and also to allow significant circuit simplifications and economics.Transmission may be initiated by push button or by interrogation from the central receiver station.A receiver receives and synchronously decodes the transmitted signal.

Abstract: A wrist-mounted indicating device coupled to various parts of the body of the wearer for measuring and visually indicating the pulse rate, the breathing rate and the jogging rate during a running exercise.

Abstract: A recognition and identification key comprising a substrate formed from an electrically insulating material, a first sheet of conductive material formed on a first surface of the substrate in a looping pattern so as to provide an inductive element, and a capacitive element coupled to the first sheet such that the elements are resonant at a first frequency, at least one of the inductive and capacitive elements capable of being changed such that the key is resonant at a second frequency, and a method of adapting the resonant frequency.

Abstract: An electronic recognition and identification system for recognizing and identifying any one of a family of electrically-coded external objects. The system comprises internal electronics including a pulse widening circuit which enables the system to be responsive to each of the codes of the family of external objects.