A method and apparatus for encoding data into amplitude and pulse encoded signals begins by partially encoding a set of bits that are contained within a data stream into a pulse modulated signal. The encoding continues by amplitude modulating the pulse modulated signal to produce the amplitude and pulse...http://www.google.com/patents/US20010055353?utm_source=gb-gplus-sharePatent US20010055353 - METHOD AND APPARATUS FOR AMPLITUDE AND PULSE MODULATION
