Claims
- 1. A hearing aid comprising:
- a sound inlet with sound detector;
- an adjustable electronic analog amplification circuit including a pre-amplifier and an output amplifier;
- a sound reproducer;
- a regulation part including first regulation means for adjusting the frequency response of the amplification circuit, the regulation part arranged for finger operation at any time thereby allowing the user to directly gradually adjust the amplifier's frequency response slope for frequencies above a transition frequency and for frequencies in an amplitude range above a frequency independent amplitude setting so that the variable treble boost is obtained according to the user's individual needs and acceptance;
- where said transition frequency is between 500 Hz-2 Khz;
- wherein said regulation part includes second regulation means arranged to regulate the basic amplification of the amplifier circuit in a substantially frequency independent manner and
- wherein said regulation part further includes a third-order filter, the third-order filter comprising a resistor-capacitor network and an amplification circuit with a feedback path which contains an additional amplifier, wherein the third-order filter determines the frequency response and thus determines the degree of variable treble boost.
- 2. A hearing aid according to claim 1 wherein regulation of the amplification in the feedback path of each of the regulation elements is accomplished by a single user-operated regulation part.
Parent Case Info
This is a continuation-in-part of U.S. application Ser. No. 804,054 filed 3 Dec. 1985 now abandoned.
US Referenced Citations (20)
Foreign Referenced Citations (4)
Number |
Date |
Country |
2931482 |
Feb 1981 |
DEX |
3141420 |
May 1983 |
DEX |
3205685 |
Aug 1983 |
DEX |
1316557 |
Jul 1968 |
FRX |
Non-Patent Literature Citations (2)
Entry |
Mead C. Killion, Recent Earmolds for Wideband OTE and ITE Hearing Aids, Hearing Journal at 15, (Aug. 1984). |
Wayne J. Staab, Development of a Programmable Behind-the-Ear Hearing Instrument, 39 Hearing Instruments No. 8, Oct. 1988, p. 22. |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
804054 |
Dec 1985 |
|