Abstract: Communication terminal includes a first microphone system, a second microphone system, and a noise reduction processing unit (NRPU). The NRPU receives a primary signal from the first microphone system and a secondary signal from the second microphone system. The NRPU dynamically identify an optimal transfer function of a correction filter which can be applied to the secondary signal provided by the second microphone system to obtain a correction signal. The correction signal is subtracted from the primary signal to obtain a remainder signal which approximates a signal of interest contained within the primary signal.

Abstract: Communication terminal includes a first microphone system, a second microphone system, and a noise reduction processing unit (NRPU). The NRPU receives a primary signal from the first microphone system and a secondary signal from the second microphone system. The NRPU dynamically identify an optimal transfer function of a correction filter which can be applied to the secondary signal provided by the second microphone system to obtain a correction signal. The correction signal is subtracted from the primary signal to obtain a remainder signal which approximates a signal of interest contained within the primary signal.

Abstract: Systems (100) and methods (400) for transducer volume bias control. The methods involve: obtaining an audio signal that is to be output from first and second transducers (102, 202) of an electronic device (100); and dynamically changing spectral content of the audio signal to at least one of the first and second transducers as a transducer volume level increases and decreases. The first transducer is disposed on a first side (108) of the electronic device. The second transducer is disposed on a second side (204) that is different than the first side of the electronic device. The first and second transducers have imbalanced capabilities.

Abstract: Systems (300) and methods (1100) for providing audio output from a handheld Communication Device (“CD”). The methods comprise: receiving an audio signal at CD; and dividing the audio signal into a first audio signal with a first frequency bandwidth and a second audio signal with a second frequency bandwidth exclusive of and lower than the first frequency bandwidth. Next, a first electroacoustic transducer (402) produces directional sound in response to the first audio signal. A second electroacoustic transducer (404) produces omnidirectional sound in response to the second audio signal. The first electroacoustic transducer is located on a first side (406) of CD which comprises at least one input device (320, 340) of a user interface (330) that has a stacked arrangement with the first electroacoustic transducer. The second electroacoustic transducer is located on a second side (408) opposed from the first side of the communication device.