196 results about "Acoustic processing" patented technology

A cooled acoustic liner useful in a fluid handling duct includes a resonator chamber 52 with a neck 56, a face sheet 86, and a coolant plenum 80 residing between the face sheet and the chamber. Coolant bypasses the resonator chamber, rather than flowing through it, resulting in better acoustic admittance than in liners in which coolant flows through the resonator chamber and neck. In one embodiment, the liner also includes a graze shield 88. Openings 40, 38 penetrate both the face sheet and the shield to establish a relatively low face sheet porosity and a relatively high shield porosity. The shielded embodiment of the invention helps prevent a loss of acoustic admittance due to fluid grazing past the liner. Another embodiment that is not necessarily cooled, includes the resonator chamber, low porosity face sheet and high porosity shield, but no coolant plenum for bypassing coolant around the resonator chamber. An associated method of retrofitting an acoustic treatment into a fluid handling module includes installing openings in the module and mounting a resonator box 44 on the module so that the inlets to the resonator necks register with the installed openings.

Combination light diffusion with either sound diffusion or absorption is provided in a single lighting fixture, to provide uniform luminosity and sound control. The traditional flat light diffuser is replaced with a translucent acoustical element which either diffuses sound or absorbs the sound. The sound diffuser topology includes random surfaces, geometrical shapes, number theoretic diffusers or optimized rectilinear or curvilinear surfaces. The translucent sound absorber includes microperforated or microslit panels, as well as translucent fabrics and microperforated, translucent wood veneers.

A system and method for classifying a voice signal to one of a set of predefined categories, based upon a statistical analysis of features extracted from the voice signal. The system includes an acoustic processor and a classifier. The acoustic processor extracts features that are characteristic of the voice signal and generates feature vectors using the extracted spectral features. The classifier uses the feature vectors to compute the probability that the voice signal belongs to each of the predefined categories and classifies the voice signal to a predefined category that is associated with the highest probability.

Herein disclosed is a sound signal processing apparatus ( 10 ), comprising: a speaker unit ( 12 ) for converting a first sound signal to a first sound; sound signal producing means ( 13 ) for producing a second sound signal constituted by at least two different components including an echo component indicative of the sound outputted by the speaker unit ( 12 ), and a voice component indicative of one's voice having a least one leading end; echo component suppressing means ( 14 ) for suppressing the echo component of the second sound signal on the basis of the first and second sound signals to output, as a third sound signal, the suppressed second sound signal; sound signal storing means ( 15 ) for storing the third sound signal outputted by the echo component suppressing means ( 14 ); voice detecting means ( 16 ) for detecting the leading end of the speaker's voice on the basis of the third sound signal outputted by the echo component suppressing means ( 14 ); and controlling means ( 17 ) for controlling the sound signal storing means ( 15 ) to have the sound signal storing means ( 15 ) output, as a fourth sound signal, said third sound signal stored in the time period when said voice is detected on the basis of said third sound signal outputted by said echo component suppressing means, the controlling means ( 17 ) being operative to specify two different clock times on the basis of a predetermined time difference, the clock times including a first clock time at which the leading end of the voice is detected by the voice detecting means ( 16 ), and a second clock time prior to the first clock time, the controlling means ( 17 ) being operative to have the sound signal storing means ( 15 ) start to output the third sound signal stored after the second clock time.