- Forschung
- Speech
Speech
- Echo Cancellation
- Acoustic Echo Cancellation deals with the question how to eliminate an occurring echo in conferencing or hands-free communication situations. Key element is the estimation of the acoustical path, over which the incoming signal is transmitted and afterwards received at the microphone as a disturbing echo signal. Therefore adaptive algorithms are used and combined with a postfilter for residual echo supression.
- Multi-Microphone Systems
- Reverberant signals cause problems. Dereverberation algorithms suppress reverberation. Typical algorithms and their applications are introduced.
- Bandwidth Extension
- "Artificial Bandwidth Extension" adds synthetic frequency components to narrowband speech. Thus a more natural sounding speech reproduction and an increased intelligibility is achieved.
- Intelligibility Enhancement
- Algorithms for near-end listening enhancement (NELE) improve the intelligibility of speech from the far-end, played back in a noisy near-end environment, by adaptively filtering the speech signal and taking into account the near-end background noise characteristics.
- Dereverberation
- Dereverberation algorithms remove unwanted reverberation from signals recorded in reverberant rooms. Typical applications of dereverberation are the improvement of telephone or hearing aid speech quality or automatic speech recognition.
- Noise Reduction
- Given a noisy input signal, noise reduction aims at attenuates the noise signal component as much as possible while keeping the distortion of the underlying speech signal as low as possible.
