Other

Sigmatron Nova, Inc.

Teletron Security, Inc.

Randy W Watkins

Walter F Essinger

Joseph A Martorano

Robert J Bell

A proximity reader for a radio frequency identification (RFID) system is programmed for determining and storing optimum antenna impedance values to achieve peak antenna resonance at each of multiple operating frequencies. Antenna resonance is peaked at power up and periodically during operation to compensate for environmental detuning influences. The reader scans the multiple frequencies to more effectively search for off-frequency identification tags.

Auto-tunning scanning proximity reader

A backup security system for the telephone company lines of a protected home located in a neighborhood in which all the homes have a.c. supply lines connected to a common power transformer. The protected home, in addition to being provided with a conventional security system, is provided with a line-cut monitor, a PWM transmitter, and a conflict avoidance circuit. When the line-cut monitor senses that the telephone company lines for the protected home have been cut by an intruder, it provided a signal for gating an alarm signal from the conventional security system to the PWM transmitter which impresses the alarm signal as high frequency signals on the a.c. supply lines in the neighborhood. A neighboring home in the neighborhood is provided with a PWM receiver, telephone company lines and an automatic telelphone communicator. The PWM receiver in the neighboring home responds to the high frequency signals on the a.c. supply lines and provides a digital signal to the automatic telephone communicator causing it to seize the telephone company lines for the neighboring home and send a message informing a central station that an intruder has broken into the protected home. The conflict avoidance circuit in the protected home enables the PWM transmitter therein to impress high frequency signals on the a.c. supply lines in the neighborhood only when there is an absence of any other high frequency signals on the a.c. supply lines in the neighborhood.

Neighborhood home security system

A central controller is connected by a common two-wire communication cable to a plurality of remote zone transponders. Each zone transponder includes a counting means and a resistive network having a detecting sensor therein. The central controller includes pulse generating means for generating control pulses and address pulses, and an analog-to-digital converter means. A gate enabled by the control pulses passes the address pulses onto the communication cable for supplying power to and incrementing the counting means in each of the zone transponders to sequentially render the resistive network in each operable to transmit a responsive current on the communication cable back to the central controller where the disabling of the gate by the absence of a control pulse permits the analog-to-digital converter means to receive the responsive current from the resistive network of each of the zone transponders and convert it into a digital signal indicative of the status of the detecting sensor therein.

Multiple-zone intrusion detection system

A plurality of memory sections is provided each storing binary data to be employed for refreshing picture elements of a thin-film EL matrix display panel on successive frame time periods constituting an integration time period. The number of frame time periods in an integration time period corresponds to the number of different shades to be displayed on the panel. The binary data stored in each of the memory sections differs. Thus, when the binary data in the memory sections are read out on successive frame time periods, some of the picture elements on the panel are refreshed more than others during the integration time period. Accordingly, the eye of the viewer receives more light from some picture elements than others during each integration time period which results in the relative brightness levels and, therefore, the shades of the picture elements to vary. In a modified embodiment of the present invention each of the memory sections is binarily weighted and, during an integration time period, each memory section is read out a number of frame time periods corresponding to its binary weight in order to obtain the different brightness levels or shades on the panel.

Growing community of inventors

Sun Valley, CA, United States of America

Randy W Watkins