Abstract: This specification describes, among other things, a computer-implemented method. The method can include receiving a stream of audio data at a computing device. The stream of audio data can be segmented into a plurality of audio segments. Respective intensity levels are determined for each of the plurality of audio segments. For each of the plurality of audio segments and based on the respective intensity levels, a determination can be made as to whether the audio segment includes a speech signal. Selective gain control can be performed on the stream of audio data by automatically adjusting a gain of particular ones of the plurality of audio segments that are determined to include a speech signal.

Abstract: This specification describes, among other things, a computer-implemented method. The method can include training a baseline neural network using a first set of training data. For each node in a subset of interconnected nodes in the baseline neural network, a rank-k approximation of a filter for the node can be computed. A subset of nodes in a rank-constrained neural network can then be initialized with the rank-k approximations of the filters from the baseline neural network. The subset of nodes in the rank-constrained neural network can correspond to the subset of nodes in the baseline neural network. After initializing, the rank-constrained neural network can be trained using a second set of training data while maintaining a rank-k filter topology for the subset of nodes in the rank-constrained neural network.

Abstract: This specification describes, among other things, a computer-implemented method. The method can include receiving a stream of audio data at a computing device. The stream of audio data can be segmented into a plurality of audio segments. Respective intensity levels are determined for each of the plurality of audio segments. For each of the plurality of audio segments and based on the respective intensity levels, a determination can be made as to whether the audio segment includes a speech signal. Selective gain control can be performed on the stream of audio data by automatically adjusting a gain of particular ones of the plurality of audio segments that are determined to include a speech signal.