The present invention provides an apparatus and a method for generating vital information signals which are formed by a pulse train made up of bursts of the same width and distance, wherein each burst is made up of a given number of pulses of a specific frequency. The apparatus according to the present...http://www.google.com/patents/US5018524?utm_source=gb-gplus-sharePatent US5018524 - Apparatus and method for generating vital information signals
