H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/5, 326/1.4
H04M 11/00 (2006.01) A61B 5/00 (2006.01) A61N 1/37 (2006.01)
Patent
CA 1073133
ABSTRACT OF THE DISCLOSURE A system for providing a signal suitable for transmission by telephone equipment to indicate the duration of pulses produced by a heart pacer is disclosed. The system includes a pickup for detecting pacer pulses and a switched circuit responsive to pulse duration for applying charge to a first capacitor. During the inter-pulse period a second or reference capacitor is charged to a level corresponding to that of the first capacitor through a timed switching circuit, after which another timed switching circuit discharges the first capacitor to prepare it for receiving a sub_ sequent charge. The potential accumulated upon the second capacitor is then used to operate an output stage pulse generator which controls the duration of an audio-frequency tone burst The duration of this tone, or more precisely, the period of interruption of this tone provides a telephonically transmittable analog of pacer pulse width.
284077
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