11,068 research outputs found

    Mutual funds and annuities at Tenth District banks

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    Mutual funds are today's second-largest financial industry in the United States, second only to commercial banks. Since 1990, mutual fund assets have more than doubled to $2.3 trillion. Such rapid growth, coupled with the desire of banks to expand into new financial services, has prompted up to one-fourth of all U.S. commercial banks to begin selling mutual funds and annuities. Some banks have even begun to manage and provide investment advice to their own mutual fund companies. This article shows that many commercial banks in the Tenth District states are following the national trend, with large banks leading the way.Mutual funds ; Federal Reserve District, 10th

    Speech Separation Using Partially Asynchronous Microphone Arrays Without Resampling

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    We consider the problem of separating speech sources captured by multiple spatially separated devices, each of which has multiple microphones and samples its signals at a slightly different rate. Most asynchronous array processing methods rely on sample rate offset estimation and resampling, but these offsets can be difficult to estimate if the sources or microphones are moving. We propose a source separation method that does not require offset estimation or signal resampling. Instead, we divide the distributed array into several synchronous subarrays. All arrays are used jointly to estimate the time-varying signal statistics, and those statistics are used to design separate time-varying spatial filters in each array. We demonstrate the method for speech mixtures recorded on both stationary and moving microphone arrays.Comment: To appear at the International Workshop on Acoustic Signal Enhancement (IWAENC 2018

    Acoustic Impulse Responses for Wearable Audio Devices

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    We present an open-access dataset of over 8000 acoustic impulse from 160 microphones spread across the body and affixed to wearable accessories. The data can be used to evaluate audio capture and array processing systems using wearable devices such as hearing aids, headphones, eyeglasses, jewelry, and clothing. We analyze the acoustic transfer functions of different parts of the body, measure the effects of clothing worn over microphones, compare measurements from a live human subject to those from a mannequin, and simulate the noise-reduction performance of several beamformers. The results suggest that arrays of microphones spread across the body are more effective than those confined to a single device.Comment: To appear at ICASSP 201

    Continued strength at Tenth District banks

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    Commercial banks in Tenth District states continued to perform well in the first half of 1994. Profitability leveled off at a high level, asset quality improved, and loan growth accelerated. Based on these performance measures, banks in district states once again outperformed banks in the rest of the nation.Bank profits ; Federal Reserve District, 10th

    Impact of surface-polish on the angular and wavelength dependence of fiber focal ratio degradation

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    We present measurements of how multimode fiber focal-ratio degradation (FRD) and throughput vary with levels of fiber surface polish from 60 to 0.5 micron grit. Measurements used full-beam and laser injection methods at wavelengths between 0.4 and 0.8 microns on 17 meter lengths of Polymicro FBP 300 and 400 micron core fiber. Full-beam injection probed input focal-ratios between f/3 and f/13.5, while laser injection allowed us to isolate FRD at discrete injection angles up to 17 degrees (f/1.6 marginal ray). We find (1) FRD effects decrease as grit size decreases, with the largest gains in beam quality occurring at grit sizes above 5 microns; (2) total throughput increases as grit size decreases, reaching 90% at 790 nm with the finest polishing levels; (3) total throughput is higher at redder wavelengths for coarser polishing grit, indicating surface-scattering as the primary source of loss. We also quantify the angular dependence of FRD as a function of polishing level. Our results indicate that a commonly adopted micro-bending model for FRD is a poor descriptor of the observed phenomenon.Comment: 10 pages, 7 figures, presented at SPIE Astronomical Telescopes and Instrumentation, July 201
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