Abstract: Acoustic telemetry devices and methods that provide directional detection. In one embodiment, a disclosed acoustic telemetry device comprises at least two acoustic sensors and an electronics module. The electronics module combines the detection signals from the acoustic sensors to obtain a combined signal that substantially excludes signals propagating in a direction opposite to the communication signal. The disclosed systems and methods can be trained in the field and will readily accommodate an irregular and unknown signal transmission medium between the two acoustic sensors.

Abstract: Acoustic telemetry devices and methods that provide directional detection. In one embodiment, a disclosed acoustic telemetry device comprises at least two acoustic sensors and an electronics module.

Abstract: A device is disclosed for delivery of grafts such as, for example, semitendinosus and/or gracilis tendons for reconstructive surgery. The device is a woven structure whose diameter is reduced when placed in tension. It has a tapering end and an open end. A suture is looped within the device so that the loop extends from the open end to receive the folded graft. The suture is pulled to insert the graft into the device. The graft, after folding and being pulled into the device, may have sutures extending out of one end as an optional feature to facilitate subsequent fixation. The sutures extending through the tapered end are pulled, tightening the device around the graft while pulling the device with the graft inside through the bone tunnels such as, for example, tibial and femoral tunnels. The narrow tapering end traps the graft as the device tightens around the graft for insertion into the tunnels.

Abstract: A process for applying a flocking fiber to a cloth surface of a shoe includes the step of spraying a clean dry cloth shoe with an adhesive, which adheres to the cloth substrate without excess penetration, which remains pliable, and is not water soluble when set. A short set time is desirable, and then flock fibers suitable for application are carried into a charge in an electrostatic field. A conventional flocking chamber is used, voltage is applied to the electric field, and the flock fibers are applied so that they adhere to the adhesive surface under controlled conditions. The shoe is dried in a drying oven, and then it is ready for use. The flocking process can use adhesives that are colored, flock that is colored, and the flock can be applied in any desired pattern because of the use of the adhesive for causing the flock material to adhere to the cloth surface.

Abstract: The disclosed system for extracting desired information from a speech signal includes means for taking overlapping samples of an utterance, computer means programmed to test each sample to determine whether it is voiced or unvoiced and for performing the following operations on each voiced sample: applying a 30 ms. Hamming window to smooth the edge of the signal and to ensure that false artifacts will not be present in the following processing stage, obtaining a magnitude spectrum using at least 1024 points Fast Fourier transform, obtaining the log of the magnitude spectrum, compressing the spectrum, performing a three-point filter algorithm a suitable number of times, expanding the spectrum so obtained and locating the dominant peaks in the resulting spectrum to give the information content contained in said speech signal. The specification also discloses the time equivalent of the above method. The transformed spectrum is smoothed to suppress low amplitude peaks at harmonics of the pitch frequency.