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—The purpose of room impulse response (RIR) shortening and reshaping is usually to improve the intelligibility of the received signal by prefiltering the source signal before it is played with a loudspeaker in a closed room. In an alternative, but mathematically equivalent setting, one may aim to postfilter a recorded microphone signal to remove audible(More)
This paper addresses the usability of channel shortening equalizers known for data transmission systems for the equalization of acoustic systems. In multicarrier systems, equalization filters are used to shorten the channel's effective length to the size of a cyclic prefix or the guard interval. In most applications the equalizer succeeds the channel. In(More)
Directional audio coding (DirAC) is a recent method for spatial audio processing, based on a perceptually motivated representation of spatial sound. Due to its efficiency, DirAC has already been proposed for spatial audio teleconferencing scenarios. Modern hands-free communication systems usually include beamforming techniques to improve speech(More)
The purpose of room impulse response (RIR) shortening and reshaping is usually to improve the intelligibility of the received signal by prefiltering the source signal before it is played with a loudspeaker in a closed room. In an alternative, but mathematically equivalent setting, one may aim to postfilter a recorded microphone signal to remove audible(More)
Virtual 3-D sound can be easily delivered to a listener by binaural audio signals that are reproduced via headphones, which guarantees that only the correct signals reach the corresponding ears. Reproducing the binaural audio signal by two or more loudspeakers introduces the problems of crosstalk on the one hand, and, of reverberation on the other hand. In(More)
The objective of this paper is to investigate the usability of channel shortening approaches known from data transmission for the equalization of acoustic systems. In setups for data transmission, the equalizing filter usually succeeds the channel, whereas in systems for the compensation of room acoustics it is placed in the signal path in front of the(More)
In this contribution various objective measures that can be used to evaluate speech dereverberation algorithms by means of listening-room compensation (LRC) are compared to subjective listening tests. It is shown that technical measures describing the impulse responses are suitable for evaluation of such algorithms. Most signal-based objective measures fail(More)
Hands-free telecommunication systems require acoustic echo control to cancel echoes that arise from a coupling between loudspeakers and microphones. Acoustic echo suppression (AES) represents a robust and efficient approach to cope with such echoes. Since AES applies a frequency selective attenuation of the microphone signal, it may also affect the near-end(More)
This paper aims at double-talk detection for acoustic echo cancellers enabling transmission of speech signals in stereo. Double-talk detectors are affected by the same known non-uniqueness problem as echo cancellers. However, echo cancellers are usually adapted using NLMS-like iterative algorithms. Double-talk detectors being based on pseudo-coherence(More)