Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A transmitter assembly for a telephone handset, characterized by a cartridge electret microphone 10 and an adaptor 11 enclosing the microphone, the said adaptor having a tubular housing 12 defining a cylindrical bore, a ledge 21 extending around the bore a predetermined distance from a front end of the bore, deformable means 19 extending into the bore at a rear end, the cartridge microphone 10 being a snap insertion past the deformable means 19 and being held between the deformable means 19 and the ledge 21, an end wall 13 extending across the front end of the bore and defining with the microphone a first volume, a hole 14 extending through the wall 13 and a layer of acoustic resistance material 17 extending over the hole, and means 27, 28, 41 defining a second volume on the side of the end wall 13 remote from the first volume.
Claim 2
Dependent Claim
148 words
A transmitter assembly for a telephone handset, characterized by a cartridge electret microphone 10 and an adaptor 11 enclosing the microphone, the said adaptor having a tubular housing 12 defining a cylindrical bore, a ledge 21 extending around the bore a predetermined distance from a front end of the bore, deformable means 19 extending into the bore at a rear end, the cartridge microphone 10 being a snap insertion past the deformable means 19 and being held between the deformable means 19 and the ledge 21, an end wall 13 extending across the front end of the bore and defining with the microphone a first volume, a hole 14 extending through the wall 13 and a layer of acoustic resistance material 17 extending over the hole, and means 27, 28, 41 defining a second volume on the side of the end wall 13 remote from the first volume.
Claim 3
Dependent Claim
61 words
An assembly as claimed in claim 1, the means defining a second volume characterized by a transmitter housing 27 of the telephone handset, the transmitter housing 27 having a front face 41, and a tubular formation 28 extending from an inner side of the front face 41, the adaptor 11 seated on an inner end surface of the tubular formation 28.
Claim 4
Dependent Claim
57 words
An assembly as claimed in claims 1 or 2, the tubular housing defining the cylindrical bore characterized by a plurality of slots 18 extending from a back end of the tubular housing 12, and a shallow rib 19 extending inward at the back end, the shallow rib 19 forming the deformable means 19 extending into the bore.
Claim 5
Dependent Claim
23 words
An assembly as claimed in claim 2, characterized by a slot 42 extending through the front face 41 within the tubular formation 28.
Claim 6
Dependent Claim
67 words
An assembly as claimed in claim 4, characterized by the first volume being of a predetermined value to provide predetermined damping, the acoustic resistance of the acoustic resistance material 17 being of a vlaue to limit the peak to 14 dB rise at 1000 Hz, and the second volume being of a predetermined value to produce, in combination with the slots 42, a resonance at 3000 Hz.
Claim 7
Dependent Claim
49 words
An assembly as claimed in any one of the preceding claims, characterized by an annular rib 15 extending from a front surface of the end wall 13 coaxial with the bore, the layer of acoustic resistance material 17 being attached to the front surface within the annular rib 15.