William Chris Eaton

Methods, devices, and computer program products for operating a mobile device in multiple signal processing modes for hearing aid compatibility

An audio signal received at a mobile device is processed using a first set of equalization parameters in an acoustic coupling mode of operation, and is processed using a second set of equalization parameters in an inductive coupling mode of operation. The processed audio signal is transmitted to a speaker associated with the mobile device for acoustic coupling to a human ear and/or a hearing aid microphone, or for inductive coupling to a hearing aid telecoil.

Considerations for the evaluation of impact sound from heavy impact sources in adjacent spaces

The ability to limit a sound heard by a neighboring tenant in a mixed-use facility can be achieved by understanding how to control the source of the sound or affect its path. It is also important to evaluate or measure the sound in a way that considers what a tenant might hear. These aspects will be considered when studying impact sound resulting from the drop of heavy impact sources in adjacent spaces.

Effects of speaker location and orientation on room sound fields and room to room noise reduction

ASTM E336 requires that loudspeakers be placed at least 5 m from a partition under test, and if that is not possible, then in the corners opposite the partition. The standard further advises that if directional loudspeakers are used in the corners, they should be faced into the corners. In practice, speakers are usually placed in the corners of residential and smaller office spaces, but not in the corners of large spaces. Recent experience has uncovered two effects that need further study. First, when loudspeakers are faced into the corners of a large room, the sound spectrum is strongly colored with a large dip typically in the 100 to 500 Hz range. This effect can be seen in smaller rooms, but is much less pronounced there so it is not normally noticed. Second, the noise reduction measured for a partition of a large room appears to vary depending on whether the speakers are in the corners or not, with lower noise reduction when the speakers are in the corners. This effect does not appear to depend on whe...