Patent ID: 7881483
Filing Date: 2011-02-01
Classification: H04B,H04M

Abstract:
1. A two-way communication device comprising: an analog signal processor configured to insert in or close to an ear canal and having a first analog input for receiving a reception signal containing electrical audio signals, a second analog output for outputting a transmission signal containing electrical audio signals, the analog signal processor further comprising a bridge circuit configured to provide a first echo cancellation operation and including a transducer configured to convert the reception signal at the first analog input into acoustic wave vibrations in the ear canal and further configured to convert acoustic wave vibrations received from the ear canal into the transmission signal at the second analog output; and a digital signal processor (DSP) having a first digital output coupled to the first analog input of the analog signal processor and a second digital input coupled to the second analog output of the analog signal processor, the DSP configured to measure operating characteristics of an electronic signal path through the transducer and the bridge circuit in the analog signal processor by comparing the reception signal input into the transducer by the DSP through the first analog input with the transmission signal output by the same transducer from the second analog output responsive to the reception signal, the DSP further configured to use the measured operating characteristics to provide a second echo cancellation operation to filter reception signal echo from the transmission signal not filtered by the first echo cancellation operation provided by the analog signal processor.