A software-controlled, external programmer for transcutaneously programming and receiving data from an implanted medical device providing a real-time indication of the implanted medical device RF telemetry signal strength to the user of the device programmer while automatically optimizing gain level...http://www.google.com.tw/patents/US5107833?utm_source=gb-gplus-share專利 US5107833 - Telemetry gain adjustment algorithm and signal strength indication in a noisy environment
