Abstract: A method (196) for providing speech therapy to a learner (30) utilizes a formant estimation and visualization process (28) executable on a computing system (26). The method (196) calls for receiving a speech signal (35) from the learner (30) at an audio input (34) of the computing system (26) and estimating first and second formants (136, 138) of the speech signal (35). A target (94) is incorporated into a vowel chart (70) on a display (38) of the computing system (26). The target (70) characterizes an ideal pronunciation of the speech signal (35). A data element (134) of a relationship between the first and second formants (136, 138) is incorporated into the vowel chart (76) on the display (38). The data element (134) is compared with the target (70) to visualize an accuracy of the speech signal (35) relative to the ideal pronunciation of the speech signal (35).

Abstract: A system and method of reducing noise in an enclosure is disclosed. The method includes receiving at least one reference signal; receiving pressure signals from no more than two substantially orthogonally placed pairs of acoustic sensors, where one pair of acoustic sensors is in the x-direction and one pair of acoustic sensors is in the y-direction, and where the acoustic sensors are placed in a plane which is substantially parallel and in proximity to an inner surface of the enclosure; using the pressure signals and the reference signal to generate an output signal to minimize energy density at a location of the acoustic sensors; and sending the output signal to an acoustic actuator.