Patent ID: 6304615
Filing Date: 2001-10-16
Classification: H04L

Abstract:
A circuit for receiving an input signal and providing a controlled quantized signal in response, said circuit comprising:(a) an automatic control circuit for processing said input signal in response to an error signal so as to provide a controlled signal having a substantially constant amplitude;(b) a restorer circuit coupled to said automatic control circuit for receiving said controlled signal and providing a controlled quantized signal in response, said controlled quantized signal being equal to a first value or a second value;(c) a filter circuit coupled to said restorer circuit for band-pass filtering said controlled signal to provide a filtered controlled signal and for band-pass filtering said controlled quantized signal to provide a filtered controlled quantized signal;(d) a detection circuit coupled to said filter circuit for determining the amplitude of said filtered controlled signal and for determining the amplitude of said filtered controlled quantized signal; and(e) a difference circuit coupled to said detection circuit and to said automatic gain control circuit for determining the difference between the amplitude of said filtered controlled signal and the amplitude of said filtered controlled quantized signal and using said difference to provide said error signal,such that the amplitude of said controlled signal remains substantially equal to the amplitude of said controlled quantized signal.