Method and apparatus for processing quasi-transient telemetry signals in noisy environments
US5168871A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1990 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Nov 9, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S128/903
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A software-controlled, external programmer for transcutaneously programming and receiving data from an implanted medical device providing enhanced discrimination and detection of pulse-interval-coded signals of interest telemetered out of the implanted medical device from undesirable transient and steady-state noise. The programmer incorporates a detector including an active mixer and a precision tuned active phase shifting network providing low level signal rectification, precise narrow bandpass filtering, and 30 decibels of amplification. At the detector, the received signal is mixed with a phase shifted version of itself to produce a detected DC component which is a function of frequency. The DC response emulates a system with a narrow 25 kHz bandpass filter operating at 175 kHz, but does not share its undesirable transient response. For signals in the reject band, the output produces a signal of the opposite polarity of the signals within the pass bands. Transient0 noise excites the receiver antenna and produces a ringing response accompanied by components above 400 kHz. The noise response of the antenna stimulates the detector to produce the intended inverted output. As the tr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.