Noise activated automatic volume control
Hobson, Andrew Ford
MetadataShow full item record
Communications operators who must use receivers in a noisy audio environment without earphones are plagued by the effect of a varying background noise level. Often the operators are simultaneously performing other tasks thus can only monitor voice circuits. As the noise level varies the operator must repeatedly adjust the volume control for a comfortable listening level. An analysis of the physical situation is presented. An automatic feedback control system that measures the predominate range of frequencies of the background noise and automatically adjust the volume control of a power amplifier for a satisfactory listening level is developed. This system relieves the operator of the task of manual volume control and reduces the effect of noise masking.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Warren, Christopher L (1997);Several hull designs are studied with parametric based volume and area estimates to obtain preliminary hull forms. The volume and area study includes the effects of technologies which manifest themselves in the parametric ...
Optimal control of shock wave attenuation in single - and two-phase flow with application to ignition overpressure in launch vehicles Moshman, Nathan D. (Monterey, California. Naval Postgraduate School, 2011-12);NASA and private launch providers have a need to understand and control ignition overpressure blast waves that are generated by a solid grain rocket during ignition. Research in accurate computational fluid dynamics ...
Canright, David; Henson, Van Emden (1996-09);Several practical materials processes, e.g., welding, float-zone purification, and Czochralski crystal growth, involve a pool of molten metal with a free surface, with strong temperature gradients along the surface. In ...