A method of and apparatus for telemetering both analog and digital data transcutaneously between an implantable medical device and an external receiver, such as between an external programmer and an implantable cardiac pacer. A damped carrier at 175 kilohertz is pulse position modulated by digital data....http://www.google.de/patents/US5314450?utm_source=gb-gplus-sharePatent US5314450 - Dual channel telemetry for implanted medical device
