Patents by Inventor Hans Zahnd

Hans Zahnd has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6470033
    Abstract: In connection with plesiochronous data transmission, data are input into an elastic memory on the basis of a first clock pulse and read out on the basis of a second clock pulse which runs asynchronously with the first. Stuff bits are inserted at the end of a data frame as needed. For this purpose, the phase difference between clock pulses within a data frame is first of all measured. This phase difference is then compared with a threshold and a certain number of stuff bits are correspondingly inserted. In accordance with the invention, a frequency difference existing between the clock pulses is measured and, depending upon in which of several specified segments it lies, a correspondingly predefined modulation curve is used as threshold. Preferably a numerically optimized curve with respect to jitter amplitudes is used for each segment.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: October 22, 2002
    Assignee: Ascom Transmission AG
    Inventors: Ulrich Menzi, Hans Zahnd
  • Patent number: 4110743
    Abstract: A wireless paging receiver to be called up individually or as member of a group of receivers by a binary modulated carrier frequency call telegram. Each call telegram contains an address. Each individual address is composed by code words selected from a certain number of patterns. In a group call address one or more code words are replaced by a group call pattern, so that all receivers are called whose addresses contain the remaining code word patterns. For coding the address in the receiver only one connection must be positioned for each address code word. Messages can be transmitted with the call telegram and different call signals of different lengths generated. A parity check of the received call telegram is performed with little additional material.
    Type: Grant
    Filed: September 14, 1976
    Date of Patent: August 29, 1978
    Assignee: Hasler AG
    Inventor: Hans Zahnd