Audio signal system
An audio signal system is provided having, in one embodiment, a magnetostrictive core of varying shapes, sizes, and permeability. The core is wound with a wire, thereby forming an inductor for producing a magnetic field when current is passed through the wire. A speaker, or other audio output device, is positioned in parallel or series with the inductor. In operation, an audio signal is received and transmitted to the speaker or other audio output device, wherein a replication of the received signal is produced. An output of the magnetostrictive inductor couples with the replicated audio signal to modify and enhance the quality of the projected signal. In yet another embodiment, digital signal processing may be used to modify the received signal as well.
1. A method of processing an audio signal for a person having a hearing impairment, comprising:
utilizing a passive electrical device comprising an inductor wound about a magnetostrictive core for increasing the intelligibility of the audio signal, the passive electrical device being electrically connected to an audio speaker;
wherein the magnetostrictive core has a magnetostriction factor exceeding 8 parts per million and causes the audio signal which is otherwise unintelligible to said person to become intelligible to said person.
2. The method of claim 1 , wherein the magnetostrictive core is toroidal in shape.
3. The method of claim 1 , wherein a telephone handset contains the audio speaker.
4. The method of claim 3 , wherein the telephone handset further contains a HAC coil for transmitting signals to a hearing aid.
5. The method of claim 1 , further comprising frequency shifting of the audio signal.
6. The method of claim 5 , wherein the frequency shifting includes
a) operating the telephone handset having a bandwidth BW; and
b) within the telephone handset
i) synthesizing one or more information-containing frequency components, which lie outside the bandwidth BW, and
ii) adding the synthesized components to an acoustic signal delivered to said person.
7. A telephone handset comprising:
an apparatus for processing an audio signal for a person having a hearing impairment, comprising:
a) an audio speaker, and
b) a passive electrical device comprising an inductor wound about a magnetostrictive core for increasing the intelligibility of the audio signal, the passive electrical device being electrically connected to the audio speaker,
wherein the magnetostrictive core has a magnetostriction factor exceeding 8 parts per million and causes the audio signal which is otherwise unintelligible to said person to become intelligible; and
a HAC coil for transmitting signals to a hearing aid.
8. The telephone headset of claim 7 , wherein the magnetostrictive core is toroidal in shape.
9. The telephone headset of claim 7 , wherein the passive electrical device is configured to shift at least one frequency component of the audio signal, to produce a shifted component, and to deliver the shifted component to the audio speaker.
10. The telephone headset of claim 9 , wherein the shifted component is not present in the input audio signal.
11. The telephone headset of claim 7 , wherein the audio signal is characterized by a frequency spectrum and the passive electrical device is configured to add frequency components to the frequency spectrum, to thereby increase intelligibility of the audio signal to the person having the hearing impairment.
12. The telephone headset of claim 7 , wherein the passive electrical device is configured to:
i) suppress electromagnetic interference delivered to a hearing aid carried by said person having the hearing impairment; and
ii) allow said person having the hearing impairment to utilize the handset in two-way communication, without a hearing aid, said person having the hearing impairment having a moderate, severe, or profound hearing loss.