542,345 research outputs found
Bring the Noise: Introducing Noise Robustness to Pretrained Automatic Speech Recognition
In recent research, in the domain of speech processing, large End-to-End
(E2E) systems for Automatic Speech Recognition (ASR) have reported
state-of-the-art performance on various benchmarks. These systems intrinsically
learn how to handle and remove noise conditions from speech. Previous research
has shown, that it is possible to extract the denoising capabilities of these
models into a preprocessor network, which can be used as a frontend for
downstream ASR models. However, the proposed methods were limited to specific
fully convolutional architectures. In this work, we propose a novel method to
extract the denoising capabilities, that can be applied to any encoder-decoder
architecture. We propose the Cleancoder preprocessor architecture that extracts
hidden activations from the Conformer ASR model and feeds them to a decoder to
predict denoised spectrograms. We train our pre-processor on the Noisy Speech
Database (NSD) to reconstruct denoised spectrograms from noisy inputs. Then, we
evaluate our model as a frontend to a pretrained Conformer ASR model as well as
a frontend to train smaller Conformer ASR models from scratch. We show that the
Cleancoder is able to filter noise from speech and that it improves the total
Word Error Rate (WER) of the downstream model in noisy conditions for both
applications.Comment: Submitted and accepted for ICANN 2023 (32nd International Conference
on Artificial Neural Networks
Decreasing the uncertainty of atomic clocks via real-time noise distinguish
The environmental perturbation on atoms is the key factor restricting the
performance of atomic frequency standards, especially in long term scale. In
this letter, we demonstrate a real-time noise distinguish operation of atomic
clocks. The operation improves the statistical uncertainty by about an order of
magnitude of our fountain clock which is deteriorated previously by extra
noises. The frequency offset bring by the extra noise is also corrected. The
experiment proves the real-time noise distinguish operation can reduce the
contribution of ambient noises and improve the uncertainty limit of atomic
clocks.Comment: 5 pages, 4 figures, 1 tabl
Acquisition of pseudonoise signals by sequential estimation
Rapid Acquisition by Sequential Estimation /RASE/ system is used in the receivers of tracking and communications systems to bring identical locally generated pseudonoise digital modulation signal into time synchronization with the incoming pseudonoise signal. This acquisition system is particularly suited for medium input signal-to-noise ratios
Stochastic Control via Entropy Compression
We consider an agent trying to bring a system to an acceptable state by
repeated probabilistic action. Several recent works on algorithmizations of the
Lovasz Local Lemma (LLL) can be seen as establishing sufficient conditions for
the agent to succeed. Here we study whether such stochastic control is also
possible in a noisy environment, where both the process of state-observation
and the process of state-evolution are subject to adversarial perturbation
(noise). The introduction of noise causes the tools developed for LLL
algorithmization to break down since the key LLL ingredient, the sparsity of
the causality (dependence) relationship, no longer holds. To overcome this
challenge we develop a new analysis where entropy plays a central role, both to
measure the rate at which progress towards an acceptable state is made and the
rate at which noise undoes this progress. The end result is a sufficient
condition that allows a smooth tradeoff between the intensity of the noise and
the amenability of the system, recovering an asymmetric LLL condition in the
noiseless case.Comment: 18 page
Numerical simulations studies of the convective instability onset in a supercritical fluid
Numerical simulation studies in 2D with the addition of noise are reported
for the convection of a supercritical fluid,3He, in a Rayleigh-Be'nard cell
where the fluid parameters and cell height L are the same as in published
laboratory experiments. The noise addition is to accelerate the instability
onset after starting the heat flow across the fluid, so as to bring simulations
into better agreement with experimental observations. Homogeneous temperature
noise and spatial lateral periodic temperature variations in the top plate were
programmed into the simulations. A speed-up in the instability onset was
obtained, which was most effective through the spatial temperature variations
with a period of 2L, close to the wavelength of a pair of convections rolls.
For a small amplitude of 0.5 microK, this perturbation gave a semiquantitative
agreement with experimental observations. Results for various noise amplitudes
are presented and discussed in relation to predictions by El Khouri and
Carle`s.Comment: 6 pages (2-column format) 4 figures, Proceedings of NASA2004
workshop, Solvang,C
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