Patents Represented by Law Firm Soules & McCamish
  • Patent number: 4276573
    Abstract: A pulse shaping network for the read circuitry of a floppy disc memory system in which encoded digital data is recorded in a double density format. The pulse shaping network processes an uncompensated input read signal in order to substantially eliminate cross talk between the bivalent pulses of the read signal, thereby correcting the peak phase shift and peak amplitude distortion that characterizes intersymbol cross talk. The resulting phase and amplitude corrected read signal can then be accurately decoded in order to retrieve the information contained in the peak phases of the read signal. The pulse shaping network includes a sine pulse-forming filter comprised of a capacitively terminated parallel cascade of series LC sections characterized by respective half-period harmonic transfer functions whose impulse responses are substantially finite time duration sine pulses of a successively odd multiple of half cycles.
    Type: Grant
    Filed: June 29, 1979
    Date of Patent: June 30, 1981
    Assignee: Datapoint Corporation
    Inventors: Peter H. Halpern, Charles E. Lawrence