A subscriber unit for wireless communication with a base station in a wireless subscriber communication system includes a FIR chip, a DIF (digital intermediate frequency) chip, a single processor chip and a radio. The processor chip transcodes a digital voice input signal to provide digital input symbols;...http://www.google.com.hk/patents/US5146473?utm_source=gb-gplus-share專利 US5146473 - Subscriber unit for wireless digital subscriber communication system
