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| Omindirectional modular siren |
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| Pitch extraction apparatus for an acoustic signal waveform |
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| Output circuit |
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| Telephone line interface circuit |
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| Automatic power control circuit for controlling transmitting power of modulated radio frequency signal |
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| Speech detection circuit |
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Speech aid apparatus for laryngectomees
| Details |
Inventors: Sickel, deceased, Helmut;
Assignee: Dr. Kuhn & Co. GmbH (Cologne (Merheim), DT)
Primary Examiner: Claffy; Kathleen H.
Assistant Examiner: Kemeny; E. S.
Attorney, Agent or Firm: Burgess, Dinklage & Sprung
In a laryngeal speech aid apparatus comprising a sound head consisting of a clamped hard diaphragm capable of being set in vibration by a plunger, a driver in the form of a vibration coil connected with the plunger and associated fieldwise with a magnet assembly having a permanent magnet, a soft diaphragm connected to the plunger, and a generator-amplifier section connected electrically to the sound head for the production of periodic current pulses for the vibration coil, the improvement wherein (a) the permanent magnet of the magnet assembly consists of a permanent magnetic material designated by the formula RECo.sub.5 wherein Re represents one of the rare earth elements Y, la, Ce, Pr, Nd, Sm or mixtures thereof, and (b) on at least one of sound head and the generator-amplifier section there is provided a rapidly releasable device for the mechanical joining of the sound head and generator-amplifier, as well as a means for maintaining the electrical connection between the sound head and generator-amplifier section when the mechanical coupling is released and the sound head is spatially removed from the generator-amplifier section. |
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DETAILED DESCRIPTION What is claimed is: 1.
Speech aid apparatus for laryngectomees, comprising a sound head consisting of a clamped hard diaphragm capable of being set in vibration by a plunger, a driver in the form of a vibration coil connected with the plunger and associated field-wise with a magnet assembly having a permanent magnet, a soft diaphragm connected to the plunger and a generator-amplifier section connected electrically to the sound head for the production of periodic current pulses for the vibration coil, wherein (a) the permanent magnet of the magnet assembly consists of a permanent magnetic material designated by the formula RECo.
sub.
5 wherein Re represents one of the rare earth elements Y, la, Ce, Pr, Nd, Sm or mixtures thereof, and (b) on at least one of the sound head and the generator-amplifier section there is provided a rapidly releasable device for the mechanical joining of the sound head and generator-amplifier, as well as a means for maintaining the electrical connection between the sound head and generator-amplifier section when the mechanical coupling is released and the sound head is spatially removed from the generator-amplifier section.
2.
Speech aid apparatus as claimed in claim 1 wherein a mounting is provided on the sound head for the support of the sound head.
3.
Speech aid apparatus as claimed in claim 2 wherein the sound head support is a swiveling support.
4.
Speech aid apparatus as claimed in claim 1 wherein the magnet assembly has a first discoidal yoke piece having a core projecting vertically from the plane of the ring, and a second discoidal yoke piece having an opening to accommodate the core of the first yoke piece while leaving an annular gap to receive a guiding sleeve, the said yoke pieces containing between them the permanent magnet which has essentially the same shape as the second pole ring.
5.
Speech aid apparatus as claimed in claim 4 wherein the yoke pieces are of a truncoconical configuration on the sides facing away from the permanent magnet
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Audio Signal Processing 
