Topic
Noise
About: Noise is a research topic. Over the lifetime, 5111 publications have been published within this topic receiving 69407 citations. The topic is also known as: Мопсы танцуют под радио бандитов из сталкера 10 часов.
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26 Aug 2002
TL;DR: Simulation experiments show that the new method proposed is an efficient and robust voice activity detector and has the same merit of tracking the noise spectrum properly as in Sohn's method.
Abstract: On the basis of the short-time energy of speech signals and the efficient method of noise statistics adaptation estimation proposed by Sohn et al.(1998), a new highly robust voice activity detection (VAD) rule for any kind of environmental noise is proposed in this paper. The accurate recognition rate of the new method is about five percent higher than that of Sohn's method on average, and also has the same merit of tracking the noise spectrum properly as in Sohn's method. Simulation experiments show that the new method is an efficient and robust voice activity detector.
39 citations
TL;DR: The aim of the study was to assess the effects of exposure to impulse noise on TEOAE, as compared to PTA, and found that after military service significant deterioration of hearing was observed on average by 6 dB exclusively at the frequencies of 10 and 12 kHz.
Abstract: The aim of the study was to assess the effects of exposure to impulse noise on TEOAE, as compared to PTA. The study comprised 92 soldiers, subjected to impulse noise during military service. The control group consisted of secondary school students, not exposed to noise. Extended high frequency PTA, and TEOAE were recorded before and after one year of military service. The total level of noise and spectrum analysis were performed for all kinds of weapons, separately.The highest levels of noise for weapons were related to frequencies from 1.6–16 kHz. After military service significant deterioration of hearing was observed on average by 6 dB exclusively at the frequencies of 10 and 12 kHz. TEOAE reduction was registered predominantly at frequencies of 2, 3 and 4 kHz, with the greatest decrease at 2 kHz (p<0.02). The control group did not show any significant audiometric changes as well as TEOAE during the time of experiment.
39 citations
21 Apr 1997
TL;DR: A very practical and useful noise reduction system that has wide application for hearing impaired persons, such as a sound-gathering system at a lecture hall or conference room, and the results of intelligibility tests using persons with hearing loss show excellent noise reduction.
Abstract: We proposed a very practical and useful noise reduction system that has wide application for hearing impaired persons, such as a sound-gathering system at a lecture hall or conference room. The system uses two basic technologies, a speech/non-speech identification process and a new noise reduction process. A speech/non-speech identification process uses four characteristics of the time and frequency domains of the input signal. In the noise reduction process, frequency weighting function is used for basic spectral subtraction and a loss control algorithm. Various kinds of environmental noise were reduced by this system, which showed excellent performance. Noise is further reduced by using a multi-microphone system as an acoustic noise suppressor. The results of intelligibility tests using persons with hearing loss show excellent noise reduction.
39 citations
TL;DR: Ridid-hulled inflatable boats were the dominant noise source with respect to estimated beluga hearing sensitivity in the studied habitats due to their high occurrence and proximity, high correlation with site-specific FD-weighted sound levels, and the dominance of mid-frequencies in their noise signatures.
Abstract: The threatened resident beluga population of the St. Lawrence Estuary shares the Saguenay-St. Lawrence Marine Park with significant anthropogenic noise sources, including marine commercial traffic and a well-established, vessel-based whale-watching industry. Frequency-dependent (FD) weighting was used to approximate beluga hearing sensitivity to determine how noise exposure varied in time and space at six sites of high beluga summer residency. The relative contribution of each source to acoustic habitat degradation was estimated by measuring noise levels throughout the summer and noise signatures of typical vessel classes with respect to traffic volume and sound propagation characteristics. Rigid-hulled inflatable boats were the dominant noise source with respect to estimated beluga hearing sensitivity in the studied habitats due to their high occurrence and proximity, high correlation with site-specific FD-weighted sound levels, and the dominance of mid-frequencies (0.3–23 kHz) in their noise signatures. Median C-weighted sound pressure level (SPLRMS) had a range of 19 dB re 1 μPa between the noisiest and quietest sites. Broadband SPLRMS exceeded 120 dB re 1 μPa 8–32% of the time depending on the site. Impacts of these noise levels on St. Lawrence beluga will depend on exposure recurrence and individual responsiveness.
38 citations
Patent•
06 Oct 1997TL;DR: In this paper, an analytical method for automatic tracing of a Doppler time-velocity waveform envelope was proposed, which is based on a theoretical noise amplitude distribution in the video spectral domain.
Abstract: An analytical method for automatic tracing of a Doppler time-velocity waveform envelope. At the core of this algorithm is a maximum frequency detection mechanism which is based on searching for the highest frequency bin whose spectral amplitude exceeds a certain noise threshold. The method is based on a theoretical noise amplitude distribution in the video spectral domain. In particular, the method uses a precise model of the statistical distribution of the video spectral power of white noise to establish a threshold for maximum frequency detection. Input to the noise model is the average white noise level in the video spectral display, which can be computed using either of two analytical methods.
38 citations