Rip detector signal detection circuit
Echo canceler-suppressor speakerphone
Conversion of compressed speech codes between attenuated and unattenuated formats
System and method for providing high terminal coupling loss in a handsfree terminal Patent #: 5982755
AbstractAn apparatus and method for controlling acoustic echo cancellation in a mobile communication terminal are capable of improving phenomena occurring during a call, such as an echo phenomenon, muting phenomenon and fluctuation of transmitting signals, by performing real-time monitoring of the signal of a speaker output stage and effectively controlling an AEC function according to the characteristics of the terminal. The level of a receiving signal which is outputted to a speaker is detected. A transmitting signal, which is outputted from a microphone, is converted into a digital voice signal. A certain attenuation value is adaptively determined depending on the detected level of the receiving signal, and attenuation on transmitting signal is controlled according to the determined attenuation value.
Field of SearchUsing attenuator