WO1994010819B1 - Hearing aid with permanently adjusted frequency response - Google Patents
Hearing aid with permanently adjusted frequency responseInfo
- Publication number
- WO1994010819B1 WO1994010819B1 PCT/US1993/010214 US9310214W WO9410819B1 WO 1994010819 B1 WO1994010819 B1 WO 1994010819B1 US 9310214 W US9310214 W US 9310214W WO 9410819 B1 WO9410819 B1 WO 9410819B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- corner
- frequencies
- frequency
- hearing aid
- filter
- Prior art date
Links
Abstract
A hearing aid is permanently adjusted to match prescribed amplification characteristics at predetermined frequencies. A single channel filter (24) includes three identical filter stages (60, 62, and 64) that are optionally cascaded in series. Each of the filter stages (60, 62, and 64) exhibits a frequency response curve having a first corner frequency (36) below which the magnitude of the response curve approaches a predetermined minimum value, a second corner frequency (38) above which the magnitude of the response curve approaches a maximum value, and a predetermined gain in magnitude between the minimum and maximum values.
Claims
1. A hearing aid comprising: a microphone for converting sound waves into an audio signal; an amplifier for increasing a magnitude of the audio signal; a single channel filter having a response curve expressible as a gain in decibels over a domain of audible frequencies; a receiver for converting the audio signal into sound waves; and said response curve exhibiting (a) first and second corner frequencies, (b) a predetermined difference in gain between said first and second corner frequencies, (c) a flat frequency response below said first corner frequency, (d) a sloped frequency response between said first and second corner frequencies, and (e) a flat frequency response above said second corner frequency.
2. The hearing aid of claim 1 further comprising an adjustment circuit for setting said first corner frequency, said second corner frequency, and said difference in gain between the first and second corner frequencies independently of each other.
3. The hearing aid of claim 2 in which said difference in gain "G" between the first and second corner frequencies is determined in accordance with the following equation:
where "Wz" is said first corner frequency, " p" is said second corner frequency, and "n" is an integer.
4. The hearing aid of claim 3 in which said difference in gain "G" between the first and second corner frequencies is limited to between -45 decibels and 9 decibels.
5. The hearing aid of claim 3 in which said single channel filter is a variable order filter, and said integer "n" is equal to one-half of a selected filter order.
6. The hearing aid of claim 5 in which said single channel filter includes at least two biquadratic filter stages arranged to be cascaded in series, and said integer "n" is equal to the number of biquadratic filter stages that are cascaded in series.
7. The hearing aid of claim 6 in which each of said biquadratic filter stages exhibits a general transfer function H(s) as follows:
s2 + ( 2/Qz) + z2 H(s) = [ ] s2 + (Wp/Qp) + p2
where "s" is a complex frequency, "Wz" is said first corner frequency in angular measure, "Wp" is said second corner frequency in angular measure, and "Qz" and "Qp" are quality factors.
8. The hearing aid of claim 7 in which the corner frequency "Wp" is limited to frequencies between 1250 hertz and 2500 hertz.
9. The hearing aid of claim 7 in which the quality factors "Qz" and "Qp" are equal.
10. The hearing aid of claim 7 in which the cascaded biquadratic filter stages are identical and in which a roll-off rate between the two corner frequencies "Wz" and "Wp" is determined by said integer "n" number of biquadratic filter stages cascaded in series.
11. The hearing aid of claim 1 in which said response curve is defined by a transfer function in which one of said two corner frequencies is a pole and the other of said two corner frequencies is a zero at a non-zero frequency.
12. A hearing aid circuit having a permanently adjustable frequency response comprising: an input circuit from a microphone; an output circuit to a receiver; a plurality of filter stdges; each of said filter stages exhibiting a response curve having two variable corner frequencies; said response curve being defined by a transfer function in which one of said two corner frequencies is a pole and the other of said two corner frequencies is a zero at a non-zero frequency; a switching circuit having a first position for connecting only one of said filter stages between said input and output circuits and a second position for connecting more than one of said filter stages in series between said input and output circuits; and an adjustment circuit for varying settings of both of said two corner frequencies.
13. The circuit of claim 12 in which said plurality of filter stages includes three filter stages having the same two corner frequencies.
14. The circuit of claim 13 in which said second position of the switching circuit connects two of said three filter stages in series between said input and output circuits.
15. The circuit of claim 14 in which said switching circuit includes a third position for connecting all three of said filter stages in series between said input and output circuits.
16. The circuit of claim 15 in which said adjustment circuit provides for permanently setting said switching circuit to one of said three positions.
17. The circuit of claim 12 in which a combined response curve of said filter stages exhibits a flat frequency response below one of said two corner frequencies, a sloped frequency response between said two corner frequencies, and a flat frequency response above the other of said two corner frequencies.
18. The circuit of claim 17 in which said combined response curve exhibits a roll-off rate between said two corner frequencies is determined by the number of filter stages connected in series between the input and output circuits.
19. The circuit of claim 18 in which each of said stages is a biquadratic filter.
20. The circuit of claim 19 in which said combined response curve exhibits a predetermined difference in gain "G" in decibels between said two corner frequencies in accordance with the following equation:
= 20 log [ ( Wz 2/Wp 2 )n ]
where "Wzιι is one of said corner frequencies, "Wpn is the other of said corner frequencies, and "n" is the number of filter stages connected in series between the input and output circuits.
21. A method of matching a frequency response of a hearing aid to prescribed amplification characteristics at predetermined frequencies including the steps of: determining collective amplification characteristics of device components, including a microphone and a receiver, at the predetermined frequencies; fitting a single channel filter response curve as a function of frequency to a difference between the collective amplification characteristics and the prescribed amplification characteristics for a given hearing loss; permanently setting a first corner frequency of the filter response curve below which the response curve exhibits a flat frequency response; permanently setting a second corner frequency of the filter response curve above which the response curve exhibits a flat frequency response; and permanently setting a predetermined difference in gain between said first and second corner frequencies.
22. The method of claim 21 in which the single channel filter is made from a plurality of filter stages that can be cascaded in series, and said step of permanently setting the predetermined difference in gain includes cascading a predetermined number of the filter stages in series.
23. The method of claim 22 in which the permanent settings for the corner frequencies are made by a programmable trimming technique.
24. The method of claim 21 in which said step of fitting includes processing measured values of hearing loss with a prescription algorithm to determine the prescribed amplification characteristics.
25. The method of claim 24 in which the collective amplification characteristics approximately match the prescribed amplification characteristics for zero hearing loss independently of said single channel filter.
26. A hearing aid having a frequency response matched to prescribed amplification characteristics at predetermined frequencies comprising: a microphone for converting sound waves into an audio signal; an amplifier for increasing a magnitude of the audio signal; a receiver for converting the audio signal into sound waves; said microphone, said amplifier, and said receiver contributing to collective amplification characteristics of the hearing aid at the predetermined frequencies; a single channel filter having a frequency response curve that can be adjusted to fit a difference between the collective amplification characteristics and the prescribed amplification characteristics for a given hearing loss; and said collective amplification characteristics matching the prescribed amplification characteristics for zero hearing loss independently of said single channel filter.
27. The hearing aid of claim 26 in which the prescribed amplification characteristics for zero hearing loss are fit by a bow-shaped frequency response curve.
28. The hearing aid of claim 27 in which the prescribed amplification characteristics are determined by a prescription algorithm.
29. The hearing aid of claim 27 in which said response curve of the single channel filter exhibits (a) first and second corner frequencies, (b) a predetermined difference in gain between said first and second corner frequencies, (c) a flat frequency response below said first corner frequency, (d) a sloped frequency response between said first and second corner frequencies, and (e) a flat frequency response above said second corner frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU55393/94A AU5539394A (en) | 1992-11-03 | 1993-10-22 | Hearing aid with permanently adjusted frequency response |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US970,628 | 1992-11-03 | ||
| US07/970,628 US5406633A (en) | 1992-11-03 | 1992-11-03 | Hearing aid with permanently adjusted frequency response |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1994010819A1 WO1994010819A1 (en) | 1994-05-11 |
| WO1994010819B1 true WO1994010819B1 (en) | 1994-06-23 |
Family
ID=25517223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1993/010214 WO1994010819A1 (en) | 1992-11-03 | 1993-10-22 | Hearing aid with permanently adjusted frequency response |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5406633A (en) |
| AU (1) | AU5539394A (en) |
| WO (1) | WO1994010819A1 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5629985A (en) * | 1994-09-23 | 1997-05-13 | Thompson; Billie M. | Apparatus and methods for auditory conditioning |
| US5822442A (en) * | 1995-09-11 | 1998-10-13 | Starkey Labs, Inc. | Gain compression amplfier providing a linear compression function |
| US5862238A (en) * | 1995-09-11 | 1999-01-19 | Starkey Laboratories, Inc. | Hearing aid having input and output gain compression circuits |
| US6073187A (en) * | 1997-06-20 | 2000-06-06 | Compaq Computer Corporation | Controls and indicators available to a user for a secondary operational mode of a portable computer which is open or closed state of the computer case |
| US6201875B1 (en) | 1998-03-17 | 2001-03-13 | Sonic Innovations, Inc. | Hearing aid fitting system |
| US7010136B1 (en) * | 1999-02-17 | 2006-03-07 | Micro Ear Technology, Inc. | Resonant response matching circuit for hearing aid |
| US7181297B1 (en) | 1999-09-28 | 2007-02-20 | Sound Id | System and method for delivering customized audio data |
| WO2001070110A1 (en) * | 2000-03-24 | 2001-09-27 | Franz Burkhard K H G | Method and apparatus for treating tinnitus |
| DE10124699C1 (en) * | 2001-05-18 | 2002-12-19 | Micronas Gmbh | Circuit arrangement for improving the intelligibility of speech-containing audio signals |
| US6944474B2 (en) * | 2001-09-20 | 2005-09-13 | Sound Id | Sound enhancement for mobile phones and other products producing personalized audio for users |
| US20030230921A1 (en) * | 2002-05-10 | 2003-12-18 | George Gifeisman | Back support and a device provided therewith |
| US7201934B2 (en) * | 2002-10-15 | 2007-04-10 | Cargill, Incorporated | Dispersible cocoa products |
| US20080111607A1 (en) * | 2006-11-10 | 2008-05-15 | Hart Robert T | Amplitude-linear differential phase shift circuit |
| JP4647725B2 (en) * | 2009-02-19 | 2011-03-09 | パナソニック株式会社 | Hearing aid and volume control method for hearing aid |
| US10986454B2 (en) | 2014-01-06 | 2021-04-20 | Alpine Electronics of Silicon Valley, Inc. | Sound normalization and frequency remapping using haptic feedback |
| US8767996B1 (en) | 2014-01-06 | 2014-07-01 | Alpine Electronics of Silicon Valley, Inc. | Methods and devices for reproducing audio signals with a haptic apparatus on acoustic headphones |
| US8977376B1 (en) | 2014-01-06 | 2015-03-10 | Alpine Electronics of Silicon Valley, Inc. | Reproducing audio signals with a haptic apparatus on acoustic headphones and their calibration and measurement |
| US10085096B2 (en) | 2016-09-30 | 2018-09-25 | Sorenson Ip Holdings, Llc | Integration of audiogram data into a device |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3209083A (en) * | 1962-09-07 | 1965-09-28 | Beltone Electronics Corp | Direct-coupled transistor amplifier |
| DE2013365B2 (en) * | 1970-03-20 | 1972-08-03 | Robert Bosch Elektronik Gmbh, 1000 Berlin Und 7000 Stuttgart | MULTI-STAGE TRANSISTOR AMPLIFIER FOR HEAVY-HEAVY DEVICES |
| US3792367A (en) * | 1972-05-01 | 1974-02-12 | Bell Telephone Labor Inc | Active controllable filter circuit using variable transconductance amplifier |
| JPS5250646B2 (en) * | 1972-10-16 | 1977-12-26 | ||
| DE2353696B2 (en) * | 1973-10-26 | 1978-12-14 | Robert Bosch Gmbh, 7000 Stuttgart | Device for the hearing impaired with an automatic gain control |
| US3920931A (en) * | 1974-09-25 | 1975-11-18 | Jr Paul Yanick | Hearing aid amplifiers employing selective gain control circuits |
| US4025721A (en) * | 1976-05-04 | 1977-05-24 | Biocommunications Research Corporation | Method of and means for adaptively filtering near-stationary noise from speech |
| DE2658301C2 (en) * | 1976-12-22 | 1978-12-07 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Hearing aid |
| US4061875A (en) * | 1977-02-22 | 1977-12-06 | Stephen Freifeld | Audio processor for use in high noise environments |
| US4405831A (en) * | 1980-12-22 | 1983-09-20 | The Regents Of The University Of California | Apparatus for selective noise suppression for hearing aids |
| JPS5857199U (en) * | 1981-10-13 | 1983-04-18 | リオン株式会社 | hearing aid |
| SE436533B (en) * | 1982-02-08 | 1984-12-17 | Bo Hakansson | SET TO MUTE / ELIMINATE TRANSIENT SOUND AND TRANSIENT ELIMINATOR FOR IMPLEMENTATION OF THE SET |
| US4718094A (en) * | 1984-11-19 | 1988-01-05 | International Business Machines Corp. | Speech recognition system |
| US4792977A (en) * | 1986-03-12 | 1988-12-20 | Beltone Electronics Corporation | Hearing aid circuit |
| US4750207A (en) * | 1986-03-31 | 1988-06-07 | Siemens Hearing Instruments, Inc. | Hearing aid noise suppression system |
| US4837832A (en) * | 1987-10-20 | 1989-06-06 | Sol Fanshel | Electronic hearing aid with gain control means for eliminating low frequency noise |
| US5001441A (en) * | 1989-10-30 | 1991-03-19 | Allied-Signal Inc. | Operational transconductance amplifier programmable filter |
| AT407103B (en) * | 1990-11-07 | 2000-12-27 | Viennatone Gmbh | HEARING AID WITH FILTER CIRCUIT |
-
1992
- 1992-11-03 US US07/970,628 patent/US5406633A/en not_active Expired - Fee Related
-
1993
- 1993-10-22 AU AU55393/94A patent/AU5539394A/en not_active Abandoned
- 1993-10-22 WO PCT/US1993/010214 patent/WO1994010819A1/en active Application Filing
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