A Calibrator for Sound Level Meters

Multi-Level Profile-Meters for Service Differentiation in the Internet

The loss of fairness due to parallel TCP connections and the new UDP applications imply an architectural change in Internet’s structure. Service Differentiation is a new concept that defines simple methods to improve Quality of Service. The key modules of this model are the profile verifiers located in edge routers. They are charged of creating a tag for each packet based on this verification. ...

Calibrator Design for the COBE

The photometric errors of the external calibrator for the FIRAS instrument on the COBE are smaller than the measurement errors on the cosmic microwave background (CMBR) spectrum (typically 0.02 MJy/sr, 1 σ), and smaller than 0.01% of the peak brightness of the CMBR. The calibrator is a re-entrant cone, shaped like a trumpet mute, made of Eccosorb iron-loaded epoxy. It fills the entire beam of t...

Spectral Modeling for Higher-level Sound Transformations

When designing audio effects for music processing, we are always aiming at providing higherlevel representations that may somehow fill in the gap between the signal processing world and the end-user. Spectral models in general, and the Sinusoidal plus Residual model in particular, can sometimes offer ways to implement such schemes.

Sound pressure level in a municipal preschool

AIM  To evaluate the sound pressure level to which preschool students are exposed. METHOD  This was a prospective, quantitative, nonexperimental, and descriptive study. To achieve the aim of the study we used an audio dosimeter. The sound pressure level (SPL) measurements were obtained for 2 age based classrooms. Preschool I and II. The measurements were obtained over 4 days in 8-hour session...

Determination of a Sound Level for Railroad Horn Regulatory Compliance