Abstract: A universal remote control transmitter for use with garage door openers including a number of switches whereby a user can program a transmitted modulation format and carrier frequency, and a controller for scanning the switches to determine the user programmed selections. The controller, in response to the programmed selections, outputs the required modulation to a selected transmitter, as well as direction to fine tune the transmitter to the particular carrier frequency. Also included is a power sensor circuit that responds to a change in power supply voltage by adjusting the modulation to maintain a constant peak transmitter output power.

Abstract: An apparatus directed to portable peripheral cards is disclosed which provide protection against electro-static discharge and electro-magnetic interference. Furthermore, this apparatus provides a solid housing which affords a strong protective structure for the PC board and also protects the ICs housed inside the peripheral card from being easily accessed.

Abstract: A universal remote control transmitter for use with garage door openers including a number of switches whereby a user can program a transmitted modulation format and carrier frequency, and a controller for scanning the switches to determine the user programmed selections. The controller, in response to the programmed selections, outputs the required modulation to a selected transmitter, as well as direction to fine tune the transmitter to the particular carrier frequency. Also included is a power sensor circuit that responds to a change in power supply voltage by adjusting the modulation to maintain a constant peak transmitter output power.

Abstract: The present invention is embodied in a Secured Processing Unit (SPU) chip, a microprocessor designed especially for secure data processing. By integrating keys, encryption/decryption engines and algorithms in the SPU, the entire security process is rendered portable and easily distributed across physical boundaries. The invention is based on the orchestration of three interrelated systems: (i) detectors, which alert the SPU to the existence, and help characterize the nature, of a security attack; (ii) filters, which correlate the data from the various detectors, weighing the severity of the attack against the risk to the SPU's integrity, both to its secret data and to the design itself; and (iii) responses, which are countermeasures, calculated by the filters to be most appropriate under the circumstances, to deal with the attack or attacks present.