For hands-free, untethered full-duplex speech communication at the human-machine interface, the acoustic feedback from the loudspeaker(s) to the microphone(s) has to be suppressed. Following the analysis of the problem, the basic concept of acoustic echo cancellation is reviewed. Typical adaptation algorithms are discussed and adaptation control as well as computationally efficient filtering sc...

In a duct-flute such as the recorder, steady-state oscillations are controlled by two parameters, the blowing pressure and the frequency of the acoustic resonator. As in most feedback oscillators, the oscillation amplitude is determined by gain-saturation of the amplifier, and thus it cannot be controlled independently of blowing pressure and frequency unless the feedback loop is opened. In thi...

This paper discusses a time-domain technique for synthesizing acoustic impedance at the diaphragm of a loudspeaker using a proportional-plus-derivative output feedback. The dynamics of electroacoustic transducers such as moving-coil loudspeakers can be readily controlled either by direct feedback principle on acoustic quantities, or by plugging a shunt network at the electrical terminals. Any c...

Budgerigars are small Australian parrots that learn new vocalizations throughout adulthood. Earlier work has shown that an external acoustic model and auditory feedback are necessary for the development of normal contact calls in this species. Here, the role of auditory feedback in the maintenance of species-typical contact calls and warble song in adult budgerigars is documented. Deafened adul...

The article presents a statistical mapping approach for crossspeaker acoustic-to-articulatory inversion. The goal is to estimate the most likely articulatory trajectories for a reference speaker from the speech audio signal of another speaker. This approach is developed in the framework of our system of visual articulatory feedback developed for computer-assisted pronunciation training applicat...

The problem of creating a multiuser hands-free immersive telecommunications environment poses many challenges for acoustic signal processing. The most pressing is the creation of a fast multi-channel acoustic echo canceller (MCAEC) to eliminate acoustic feedback created in the speaker-microphone loop. Traditional multi-channel adaptive algorithms for echo cancellation are not fast enough to wor...

An acoustic impedance spectrometer was used to measure the frequencies R1 and R2 of the first two resonances of the vocal tract. The measurement was made just outside the mouth, in parallel with the free field, using a new technique that provides precise information about the acoustic response of the vocal tract in real time. Values measured for native speakers for a particular vowel were used ...

Hybrid CAA-approaches are commonly used for aeroacoustic engineering applications. In this kind of computational techniques, the numerical domain is split into a noise generating region, where an aerodynamic field generates the acoustic sources, and an acoustic propagation region. Nowadays a large variety of hybrid approaches exist differing from each other in the way the source region is model...

Despite enjoying the resulting freedom from physical constraints that can result from the incorporation of computer technology in electronic musical instruments as musicians are enabled to push back the creative boundaries within which they work, musicians are still searching for virtual instruments that come closer to their physical counterparts in terms of their playing experience. This paper...