Other

Conexant Systems, Inc.

Rest Manufacturing, Inc.

William A Farnbach

A system of and method for extended Booth encoding of two binary numbers, K and L. A stage of the encoder receives K&lsqb;2n&plus;1&rsqb;, K&lsqb;2n&rsqb;, L&lsqb;2n&plus;1&rsqb;, and C&lsqb;n&minus;1&rsqb;, N&minus;1&gE;n&gE;0, with N being the length of L, and it being assumed L&lsqb;2n&rsqb;&equals;0, and forms C&lsqb;n&rsqb;, S&lsqb;n&rsqb;, M &lsqb;n&rsqb;, and M &lsqb;n&rsqb; according to the following equations: C&lsqb;n&rsqb;&equals;K&lsqb;2n&plus;1&rsqb;&verbar;L&lsqb;2n&plus;1&rsqb;, S&lsqb;n&rsqb;&equals;K&lsqb;2n&plus;1&rsqb;{circumflex over ( )}L&lsqb;2n&plus;1&rsqb;, M &lsqb;n&rsqb;&equals;K&lsqb;2n&rsqb;{circumflex over ( )}C&lsqb;n&minus;1&rsqb;, M &lsqb;n&rsqb;&equals;(S&lsqb;n&rsqb;&/K&lsqb;2n&rsqb;&/C&lsqb;n&minus;1&rsqb;)&verbar;(/S&lsqb;n&rsqb;&K&lsqb;2n&rsqb;&C&lsqb;n&minus;1&rsqb;), where &verbar; refers to the logical OR function, {circumflex over ( )} to the exclusive OR function, & to the logical AND function, and/to the logical inversion function. Numerous applications are discussed such as using the extended Booth encoded numbers to perform arithmetic computations of the form Z&equals;(&plusmn;X&plusmn;Y)*&plusmn;W.

System of and method for efficiently performing computations through extended booth encoding of the operands thereto

An information display system is provided having a transmitter and a plurality of uniquely identified display terminals, each terminal having an IR receiver. Uniquely identified sets of messages are transmitted in by the IR transceiver for reception by the display terminals. Between each set of transmissions, the receiver is periodically activated. Once the presence of a transmission is sensed by the receiver, a timer forces the receiver to remain activated while it compares the uniquely identified received messages to the display terminals unique identification. The receiver stores the message that matches the identification of the display terminal and the timer forces the receiver to remain deactivated at least until the entire set of transmissions has been completed.

Power conserving receiver operation for a remote electronic display

The present invention comprises an electrical test circuit for testing a signal in a digital circuit, to detect common analog signal deficiencies or 'faults'. More specifically, the test circuit can simultaneously detect one or all of three such faults in a digital circuit, including: (1) a voltage spike which occurs when the signal briefly jumps either high or low; (2) a float fault which occurs when the signal is floating for too long; and (3) a noise fault which occurs when the signal passes from either the high or the low state to the float state, and then returns directly to the same state. The signal to be tested is first processed in an input state discriminator to classify it by state, either high, low, or float. In a preferred embodiment, both the high voltage threshold and the low voltage threshold of the input state discriminator are adjustable separately to accommodate all logic families. Following classification, three circuits test simultaneously for the appearance of the three separate faults, each circuit testing for a different fault. The spike fault circuit and the float fault circuit each include an adjustable timer, logic, and a comparator to test for the respective fault. The noise fault circuit includes logic to test for a noise fault. Thus, the present invention is adaptable for testing virtually any digital circuit, operating asynchronously or at any of a wide variety of frequencies. The present invention can be used alone as a device to verify proper digital circuit operation, or it can be used in combination with another testing device such as a logic analyzer.

Growing community of inventors

San Diego, CA, United States of America

William A Farnbach