Steven M. Schimmel

Learn More
Modulation filtering, which has been previously described as several related approaches to achieve modification of speech temporal dynamics, is shown to be less effective than intended. In particular, past Hilbert envelope approaches generate distortion which spreads across frequency sub-bands and modulation rejection is far from the amount intended. The(More)
We explore the use of the modulation frequency domain for single channel speaker separation. We discuss features of the modulation spectrogram of speech signals that suggest that multiple speakers are highly separable in this space. In a preliminary experiment, we separate a target speaker from an interfering speaker by manually masking out modulation(More)
Modulation filtering is a technique for filtering slowly-varying envelopes of frequency subbands of a signal, without affecting the signal's phase and fine-structure. Coherent modulation filtering is a promising subtype of such techniques where subband envelopes are determined through demodulation of the subband signal with a coherently detected subband(More)
This study evaluated the maximal attainable performance of speech enhancement strategies based on coherent modulation filtering. An optimal adaptive coherent modulation filtering algorithm was designed to enhance known signals from a target talker in two-talker babble noise. The algorithm was evaluated in a closed-set, speech-recognition-in-noise task. The(More)
Sound localization with hearing aids has traditionally been investigated in artificial laboratory settings. These settings are not representative of environments in which hearing aids are used. With individual Head-Related Transfer Functions (HRTFs) and room simulations, realistic environments can be reproduced and the performance of hearing aid algorithms(More)
  • 1