Title:
【発明の名称】埋め込み型装置と体外装置の間のPPM通信を同期させるための方法ならびにその装置
Document Type and Number:
Japanese Patent JPH10508446
Kind Code:
A
Abstract:
A method and apparatus is disclosed for use in an implantable device that communicates with an external device through pulse position modulation. A timing generator is provided as part of said implantable device that determines the phase uncertainty between an external signal and an internal cock signal. The phase uncertainty then is added to the preset delay period to more precisely control the position of the response. The phase uncertainty is measured by a dual slope circuit that varies a state variable (which can be a digital timer, a capacitor voltage, or the like) at a fixed rate with either a positive or negative slope. When the external signal is detected, the state variable is reset and then decreased at a fixed rate until the next positive edge of the clock signal. The state variable then is increased at the same rate until the subsequent positive clock edge. The resulting variable value is proportional to the phase uncertainty. When the delay timer reaches zero, the state variable is again decreased at the same fixed rate until the initial value is reached, at which the output response is generated.
Inventors:
Fernardo, Kenneth Wilson
Application Number:
JP51485095A
Publication Date:
August 18, 1998
Filing Date:
October 31, 1995
Export Citation:
Assignee:
Salzar Intermedics, Inc.
International Classes:
A61B5/00; A61N1/372; G01R25/00; H04L7/00; H04L7/033; H04L25/40; (IPC1-7): H04L7/00; A61B5/00; A61N1/372; G01R25/00; H04L25/40
Attorney, Agent or Firm:
Seiji Yanagida (1 person outside)