Electromechanical acoustic noise source

Claim 2

An acoustic noise source, comprising: a casing; a power source mounted within the casing; a calibration source within the casing connected to the power source to be rotated thereby and to impact with the casing to produce acoustic noise within a selected exitation frequency spectrum; means for selecting the spectrum; and means for attenuating the spectrum.

Claim 3

An acoustic noise source, comprising: a casing; a power source mounted within the casing; a calibration source within the casing connected to the power source to be rotated thereby and to impact with the casing to produce acoustic noise within a selected exitation frequency spectrum; means for selecting the spectrum; and means for attenuating the spectrum.

Claim 4

An acoustic noise source, comprising: a casing; a power source mounted within the casing; a calibration source within the casing connected to the power source to be rotated thereby and to impact with the casing to produce acoustic noise within a selected exitation frequency spectrum; means for selecting the spectrum; and means for attenuating the spectrum.

Claim 5

A device according to claim 1 wherein said casing is a thin walled cylinder with closure members at each end thereof.

Claim 6

A device according to claim 2 where at least two longitudinal slots are cut into the cylinder near one end thereof.

Claim 7

A device according to claim 3 wherein a collar of elastic material is molded around the slots to maintain the closed cylinder water tight.

Claim 8

A device according to claim 4 wherein the cylinder and collar are covered with an expanded rubber material.

Claim 9

A device according to claim 1 wherein the calibration source is a rotating member within the casing and in contact therewith.

Claim 10

A device according to claim 6 wherein the rotating member includes a spindle and two rotating masses journalled for rotation thereon.

Claim 11

A device according to claim 7 wherein the spindle is driven by the drive means and the rotating masses are in rolling contact with the interior of the casing.

Claim 12

A device according to claim 1 wherein said casing includes a thin walled cylinder with at least two longitudinal slots at one end thereof.

Claim 13

A device according to claim 9 wherein the calibration source includes a rotating mass in rolling contact with the interior slotted end of the cylinder.

Claim 14

The device of claim 1 wherein the means for sElecting the exitation frequency spectrum comprises: a plurality of slots longitudinally provided in the casing for forming a plurality of substantially uniform longitudinal beams therebetween.

Claim 15

The device of claim 11 wherein the means for attenuating the spectrum comprises: a layer of air pocketed rubber based material wrapped about the casing.

Claim 16

An acoustic noise source, comprising: an elongated cylindrical casing; a plurality of slots longitudinally provided in the casing for forming a plurality of substantially uniform longitudinal beams therebetween; a power source mounted within the casing; a calibration source connected to the power source to be rotated thereby within the cylinder and to impact with the beams to produce acoustic noise within a selected frequency spectrum; and a layer of air pocketed rubber based material wrapped about the casing for attenuating the spectrum.

Claim 17

An acoustic noise source, comprising: an elongated cylindrical casing; a plurality of slots longitudinally provided in the casing for forming a plurality of substantially uniform longitudinal beams therebetween; a power source mounted within the casing; a calibration source connected to the power source to be rotated thereby within the cylinder and to impact with the beams to produce acoustic noise within a selected frequency spectrum; and a layer of air pocketed rubber based material wrapped about the casing for attenuating the spectrum.