Patents Represented by Attorney David A. Boone
  • Patent number: 3984770
    Abstract: An automatic transfer oscillator system for frequency measurement using a single sampler is described. Two signals, of frequencies f.sub.1 and f.sub.2, are alternately used to drive the sampler. The two frequencies are sufficiently close by design so that the intermediate frequency signals generated arise from the same harmonic number when sampling a signal of unknown frequency f.sub.x. The resulting average IF output is accurately measured and used to compute the unknown frequency f.sub.x. Accurate measurement of the average IF output is made possible because the transition between f.sub.1 driving the sampler and f.sub.2 driving the sampler only occurs when the two signals are in phase. As a result, the IF signal transitions are also in phase and spurious signals are not produced. This technique is referred to as phase continuous switching.
    Type: Grant
    Filed: February 5, 1975
    Date of Patent: October 5, 1976
    Assignee: Hewlett-Packard Company
    Inventor: David C. Chu
  • Patent number: 3978413
    Abstract: A circuit provides the dual functional capability of a modulus counter and a shift register, and does not require parallel access of the storage elements to preset or read the counter state.
    Type: Grant
    Filed: February 7, 1975
    Date of Patent: August 31, 1976
    Assignee: Hewlett-Packard Company
    Inventor: Robert Alan Frohwerk
  • Patent number: 3970999
    Abstract: This invention addresses large memories in a computer through the use of translation tables, associated control circuitry, and an appropriate set of instructions. A portion of the memory address bits from the processor are used to address registers in translation tables. The output of the selected translation table register is appended to the remaining memory address bits (those not used to address the translation table) to form the expanded memory address. Data may be loaded into or read from the memory area selected by one translation table by a program being executed in a memory area selected by another translation table. Also, a user may execute a subroutine in a memory area selected by one translation table and then return to his main program in a memory area selected by another translation table. Memory is seen by the computer as a set of logical pages. Each translation table has a register corresponding to each logical page, starting with the lowest logical page which is called the base page.
    Type: Grant
    Filed: March 24, 1975
    Date of Patent: July 20, 1976
    Assignee: Hewlett-Packard Company
    Inventor: John S. Elward
  • Patent number: 3965367
    Abstract: A circuit provides multiple output switching functions. Diodes couple groups of switching elements to form a single complex circuit. The diodes provide isolation between each group so that the logical function of each group may be output, as well as the logical function provided by the coaction of the groups. The present invention is particularly useful in circuits using complementary switching elements, e.g., Complementary Metal Oxide Semiconductor (CMOS) and Silicon on Sapphire (SOS) integrated logic circuits.
    Type: Grant
    Filed: May 5, 1975
    Date of Patent: June 22, 1976
    Assignee: Hewlett-Packard Company
    Inventor: Kenyon Chi-Yen Mei