1. A speech recognition system (SRS) comprising: a first input to receive a raw microphone signal having a user voice signal based on user speech during a period of time and an echo signal based on sound produced by a speaker during the period of time; a second input to receive a plurality of types of echo information signals during the period of time, each type of echo information signal including information derived from the echo signal by an echo cancellation system; and a trained speech recognition processor to recognize speech based on the raw microphone signal and the plurality of types of echo information signals, wherein the processor was trained at least by inputting a plurality of different samples of raw microphone signals and a plurality of different samples of each of a plurality of the types of echo information signals.
7. The system of claim 1 , wherein the plurality of types of echo information signals include different types of ambient noise suppression signals from a noise suppressor.