WO1996002120B1 - Hearing aid device incorporating signal processing techniques - Google Patents
Hearing aid device incorporating signal processing techniquesInfo
- Publication number
- WO1996002120B1 WO1996002120B1 PCT/US1995/008275 US9508275W WO9602120B1 WO 1996002120 B1 WO1996002120 B1 WO 1996002120B1 US 9508275 W US9508275 W US 9508275W WO 9602120 B1 WO9602120 B1 WO 9602120B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- output
- input
- input connected
- amplifier
- agc circuit
- Prior art date
Links
Abstract
A hearing compensation system (10) for the hearing impaired comprises an input transducer (12) for converting acoustical information at an input to electrical signals at an output, an output transducer (20) for converting electrical signals at an input to acoustical information at an output, a plurality of bandpass filters (16-1 to 16-n), each bandpass filter having an input connected to the output of said input transducer, a plurality of AGC circuits (18-1 to 18-n), each individual of AGC circuits associated with a different one of the bandpass filters and having an input connected to the output of its associated bandpass filter and an output connected to the input of the output transducer (20).
Claims
AMENDED CLAIMS
[received by the International Bureau on 30 January 1996 (30.01.96);
original claims 1-3, 12, 14, 16 and 18 cancelled; original claims 4, 5, 7, 9-11 and 20 amended;
new claims 21-33 added; remaining claims unchanged (18 pages)]
4. A hearing compensation system comprising: an input transducer for converting acoustical information at an input thereof to electrical signals at an output thereof;
an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof;
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer; a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output connected to the input of said output transducer; wherein each of said multiplicative AGC circuits comprises: a first amplifier element having an input and an output, said first amplifier element having a having a gain of l/emax, where emax is the maximum value of an audio envelope to be presented to said AGC circuit for which AGC amplification is to result; a logarithmic element having an input connected to said output of said first amplifier element, said logarithmic element having a first output carrying a signal indicating the sign of a signal at said input and a second output carrying a signal proportional to the logarithm of the absolute value of said signal at said input; a filter having an input connected to said second output of said logarithmic element and an output, said filter having a throughput delay;
a delay element having an input connected to said first output of said logarithmic element and an output, said delay element having a delay equal to said throughput delay;
an exponential element having a first input connected to said first output of said logarithmic element, a second input connected to said second output of said logarithmic element, and an output; and
a second amplifier element having an input and an output, said input connected to said output of said exponential element, said second amplifier having a gain of emax 5. A hearing compensation system comprising:
an input transducer for convening acoustical information at an input thereof to electrical signals at an output thereof;
an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof;
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer,
a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output connected to the input of said output transducer,
wherein each of said multiplicative AGC circuits comprises:
a first amplifier element having an input and an output, said input connected to an input node of its AGC circuit, said first amplifier element having a gain of l/emax, where emax
is the maximum value of an audio envelope to be presented to said AGC circuit for which AGC amplification is to result;
an envelope detector element having an input connected to said output of said first amplifier element and an output;
a logarithmic element having an input connected to said output of said envelope detector element, said logarithmic element having an output carrying a signal proportional to the logarithm of the value of said signal at said input,
a second amplifier element having an input and an output, said input connected to said output of said logarithmic element, said second amplifier having a gain of k-1 where k is a number between zero and one,
an exponential element having an input and an output, said input connected to said output of said second amplifier element; and
a multiplier element having a first input connected to said output of said exponential element, a second input connected to said input node, and an output connected to an output node of its AGC circuit.
7. A hearing compensation system comprising:
an input transducer for converting acoustical information at an input thereof to electrical signals at an output thereof;
an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof,
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer;
a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to
the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output connected to the input of said output transducer;
wherein each of said multiplicative AGC circuits comprises:
an envelope detector element having an input and an output, said input connected to an input node of its AGC circuit;
a first amplifier element having an input and an output, said input connected to said output of said envelope detector element, said first amplifier element having a gain of 1/emax, where emu is the maximum value of an audio envelope to be presented to said AGC circuit for which AGC amplification is to result;
a logarithmic element having an input connected to said output of said first amplifier element, said logarithmic element having an output carrying a signal proportional to the logarithm of the value of said signal at said input;
a second amplifier element having an input and an output, said input connected to said output of said logarithmic clement, said second amplifier having a gain of k-1 where k is a number between zero and one,
an exponential element having an input and an output, said input connected to said output of said second amplifier element;
a soft limiter element having an input connected to said output of said second amplifier element and an output, said soft limiter clement having a limitcr characteristic selected such that its gain is limited to a maximum value equal to the gain required to compensate for an individual's hearing ioss at threshold in a frequency band passed by the one of said bandpass filters with which its AGC circuit is associated; and
a multiplier element having a first input connected to said output of said soft limiter element, a second input connected to said input node, and an output connected to an output node of its AGC circuit. 9. The hearing compensation system of any of claims 5 or 7 wherein k in said first and second amplifiers is equal to 1 minus the ratio of the heanng loss in dB at threshold in a band of frequencies passed by the one of said bandpass filters with which the individual AGC circuit containing said amplifier is associated to a quantity equal to the upper comfort level in dfi within said band of frequencies minus the normal hearing threshold in dB within said band of frequencies.
10. A hearing compensation system as in any previous claim, comprising
a noise generator connected to inject a selected amount of noise into said inputs of each of said bandpass filters, said noise weighted such that its spectral shape follows the threshold-of-hearing curve of a normal hearing individual as a function of frequency.
11. The hearing compensation system of any previous claim, wherein the number of said bandpass filters and said multiplicative AGC circuits is from 12 to 15. 13. A sound discriminator system comprising
an input transducer for converting acoustical information at an input thereof to electrical signals at an output thereof,
an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof;
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer;
a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output connected to the input of said output transducer, each multiplicative AGC circuit comprising a first amplifier element having an input and an output, said input connected to an input node of its multiplicative AGC circuit, said first amplifier element having a gain of l/emax, where emax is the maximum value of an audio envelope to be presented to said AGC circuit for which AGC amplification is to result, an envelope detector element having an input connected to said output of said first amplifier element and an output, a logarithmic element having an input connected to said output of said envelope detector element, said logarithmic element having an output carrying a signal proportional to the logarithm of the value of said signal at said input, a second amplifier element having an input and an output, said input connected to said output of said logarithmic element, said second amplifier having a gain of k-1 where k is a number greater than one, an exponential element having an input and an output, said input connected to said output of said second amplifier element, and a multiplier element having a first input connected to said output of said exponential element, a second input connected to said input node, and an output connected to an output node of its multiplicative AGC circuit.
15. A sound discriminator system comprising:
an input transducer for converting acoustical information at an input thereof to electrical signals at an output thereof;
an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof;
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer;
a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output connected to the input of said output transducer, each multiplicative AGC circuit comprising an envelope detector element having an input and an output, said input connected to an input node of its multiplicative AGC circuit, a first amplifier element having an input and an output, said input connected to said output of said envelope detector element, said first amplifier element having a gain of l/emax, where emax is the maximum value of an audio envelope to be presented to said multiplicative AGC circuit for which AGC amplification is to result, a logarithmic element having an input connected to said output of said first amplifier element, said logarithmic element having an output carrying a signal proportional to the logarithm of the value of said signal at said input, a second amplifier element having an input and an output, said input connected to said output of said logarithmic clement, said second amplifier having a gain of k-1 where k is a number greater than one, an exponential element having an input and an output, said input connected to said output of said second amplifier element, a soft limiter element having an input connected to said output of said second amplifier element and an output, said sofi limiter element having a limiter characteristic selected such that its gain is limited to a maximum value equal to a preselected comfort level in a frequency band passed by the one of said bandpass filters with which its multiplicative AGC circuit is associated, and a multiplier element having a first input connected to said output of said sofi limiter element, a
second input connected to said input node, and an output connected to an output node of its multiplicative AGC circuit.
17. A sound discriminator system comprising:
an input transducer for convening acoustical information at an input thereof to electrical signals at an output thereof,
an output transducer for convening electrical signals at an input thereof to acoustical information at an outpui thereof,
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer,
a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output conneαed to the input of said output transducer, each multiplicative AGC circuit comprising a first amplifier element having an input and an output, said input connected to an input node of its multiplicative AGC circuit, said first amplifier element having a gain of 1/emax, where emax is the maximum value of an audio envelope to be presented to said AGC circuit for which AGC amplification is to result, an envelope detector element having an input connected to said output of said first amplifier element and an output, a logarithmic element having an input connected to said output of said envelope detector element, said logarithmic element having an output carrying a signal proportional to the logarithm of the value of said signal at said input, a second amplifier element having an input and an output, said input connected to said output of said logarithmic element, said second amplifier having a gain of k-1 where k is a number between zero and -1, an exponential element having an input and an output, said input
connected to said output of said second amplifier element, and a multiplier element having a first input connected to said output of said exponential element, a second input connected to said input node, and an output connected to an output node of its multiplicative AGC circuit. 19. A sound discriminator system comprising:
an input transducer for convening acoustical information at an input thereof to electrical signals at an output thereof,
an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof,
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer;
a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output connected to the input of said output transducer, each multiplicative AGC circuit comprising an envelope detector element having an input and an output, said input connected to an input node of its multiplicative AGC circuit, a first amplifier element having an input and an output, said input connected to said output of said envelope detector element, said first amplifier element having a gain of 1/emax, where emax is the maximum value of an audio envelope to be presented to said multiplicative AGC circuit for which AGC amplification is to result, a logarithmic element having an input connected to said output of said first amplifier element, said logarithmic element having an output carrying a signal proportional to the logarithm of the value of said signal at said input, a second amplifier element having an input and an output, said input connected to said output of said logarithmic element, said second amplifier having a
gain of k-1 where k is a number between zero and -1, an exponential element having an input and an output, said input connected to said output of said second amplifier element, a soft limiter element having an input connected to said output of said second amplifier element and an output, said sofi limiter element having a limiter characteristic selected to limit its gain to a maximum value equal to a preselected comfort level in a frequency band passed by the one of said bandpass filters with which its multiplicative AGC circuit is associated, and a multiplier element having a first input connected to said output of said soft limitcr element, a second input connected to said input node, and an output connected to an output node of its multiplicative AGC circuit.
20. The sound discriminator system of any of claims 5, 7, 9-11, 13, 15, 17 or 19. wherein said envelope detector element comprises:
an absolute value element having an input and an output, said input connected to said output of said first amplifier element, and
a low-pass filter element having an input and an output, said input connected to said output of said absolute value element.
21. A hearing compensation system comprising:
an input transducer for convening acoustical information at an input thereof to electrical signals at an output thereof,
an output transducer for convening electrical signals at an input thereof to acoustical information at an output thereof,
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer,
a plurality of AGC circuits, each individual AGC circuit associated with a different one of said bandpass filters and having an input connected to the output of its associated bandpass filter and an output summed with the outputs of all other ones of said AGC circuits to form a summed output, said summed output connected to the input of said output transducer, wherein each of said AGC circuits comprises a first amplifier element having an input and an output, said first amplifier element having a having a gain of l/emax, where emax is the maximum value of an audio envelope to be presented to said AGC circuit for which AGC amplification is to result, a logarithmic element having an input connected to 3aid output of said first amplifier element, said logarithmic element having a first output carrying a signal indicating the sign of a signal at said input and a second output carrying a signal proportional to the logarithm of the absolute value of said signal at said input, a filter having an input connected to said second output of said logarithmic element and an output, said filter having a throughput delay, a delay element having an input connected to said first output of said logarithmic element and an output, said delay element having a delay equal to said throughput delay, an exponential element having a first input connected to said output of said delay element, a second input connected to said output of said filter element, and an output, and a second amplifier element having an input and an output, said input connected to said output of said exponential element, said second amplifier having a gain of emax. 22. The hearing compensation system of claim 21, wherein said filter element comprises:
a high-pass filter having an input connected to said input of said filter element, and an output:
a low pass filter having an input connected to the input of said filter element and an output;
an amplifier with gain of less than unity, said amplifier having an input connected to said output of said low-pass filter and an output; and
means for summing the output of said high-pass filter and the output of said amplifier to form the output of said filter element.
23. A hearing compensation system comprising:
an input transducer for convening acoustical information at an input thereof to electrical signals at an output thereof;
an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof;
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer,
a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output connected to the input of said output transducer, wherein each of said multiplicative AGC circuits comprises a first amplifier element having an input and an output, said input forming the input node of its multiplicative AGC circuit, said first amplifier element having a gain of 1/emax, where emax is the maximum value of an audio envelope to be presented to said multiplicative AGC circuit for which AGC amplification is to result, an envelope detector element having an input connected to said output of said first amplifier element, a cutoff frequency and an output, said cutoff frequency being a monotonic function cf the center frequency of said bandpass filter associated with said multiplicative AGC circuit, a logarithmic element having an input connected to said output of said envelope detector clement, said
logarithmic element having an output carrying a signal proportional to the logarithm of the value of said signal at said input, a second amplifier element having an input and an output, said input connected to said output of said logarithmic element, said second amplifier having a gain of k-1 where k is a number between zero and one, an exponential element having an input and an output, said input connected to said output of said second amplifier element, and a multiplier element having a first input connected to said output of said exponential element, a second input connected to said input node of said multiplicative AGC circuit, and an output forming the output node of its multiplicative AGC circuit. 24. The hearing compensauon system of claim 23 wherein said envelope detector element comprises.
an absolute value element having an input and an output, said input forming the input of said envelope detector element, and
a low-pass filter element having an input, and an output forming the output of said envelope detector element, said input connected to said output of said absolute value element.
25. The hearing compensation system of claim 24 wherein said low-pass filter element has a cutoff frequency which is a monotonic function of the center frequency of said bandpass filter associated with said multiplicative AGC circuit.
26. A hearing compensation system comprising :
an input transducer for converting acoustical information at an input thereof to electrical signals at an output thereof;
an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof,
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer;
a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output connected to the input of said output transducer, wherein each of said multiplicative AGC circuits comprises an envelope detector element having an input connected to said output of said first amplifier element, a cutoff frequency and an output, said cutoff frequency being a monotonic function of the center frequency of said bandpass filter associated with said multiplicative AGC circuit, a first amplifier element having an input and an output, said input connected to said output of said envelope detector element, said first amplifier element having a gain of 1/emax, where emax is the maximum value of an audio envelope to be presented to said multiplicative AGC circuit for which AGC amplification is to result, a logarithmic element having an input connected to said output of said first amplifier clement, said logarithmic element having an output carrying a signal proportional to the logarithm of the value of said signal at said input, a second amplifier element having an input and an output, said input connected to said output of said logarithmic element, said second amplifier having a gain of k- 1 where k is a number between zero and one, an exponential element having an input and an output, said input connected to said output of said second amplifier element, a soft limiter element having an input connected to said output of said second amplifier element and an output, said soft limiter element having a limiter characteristic selected such that its gain is limited to a maximum value equal to the gain required to compensate for an individual's
hearing loss at threshold in a frequency band passed by the one of said bandpass filters with which its multiplicative AGC circuit is associated, and a multiplier element having a first input connected to said output of said sofi limiter element, a second input connected to said input node of said multiplicative AGC circuit, and an output forming the output node of its multiplicative AGC circuit.
27. The hearing compensation system of claim 26 wherein k in said first and second amplifiers is equal to 1 minus the ratio of the hearing loss in dB at threshold in a band of frequencies passed by the one of said bandpass filters with which the individual AGC circuit containing said amplifier is associated to a quantity equal to the upper comfort level in dB within said band of frequencies minus the normal hearing threshold in dB within said band of frequencies.
28. A sound discriminator system comprising:
an input transducer for converting acoustical information at an input thereof to electrical signals at an output thereof;
an output transducer for converting electrical signals at an input thereof to acoustical information at an output thereof,
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer and an output;
a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output connected to the input of said output transducer, each multiplicative AGC circuit comprising a
first amplifier element having an input and an output, said input forming the input node of its multiplicative AGC circuit, said first amplifier element having a gain of l/emax, where emax is the maximum value of an audio envelope to be presented to said AGC circuit for which AGC amplification is to result, an envelope detector element having an input connected to said output of said first amplifier element, a cutoff frequency, said cutoff frequency being a monotonic function of the center frequency of said bandpass filter associated with said AGC circuit, and an output, a logarithmic element having an input connected to said output of said envelope detector element, said logarithmic element having an output carrying a signal proportional to the logamhm of the value of said signal at said input, a second amplifier element having an input and an output, said input connected to said output of said logarithmic element, said second amplifier having a gain of k-1 where k is a number greater than one, an exponential element having an input and an output, said input connected to said output cf said second amplifier element, and a multiplier element having a first input connected to said output of said exponential element, a second input connected to said input node of said multiplicative AGC circuit, and an output forming the output node of its multiplicative AGC circuit.
29 A sound discriminator system comprising:
an input transducer for converting acoustical information at an input thereof to electrical signals at an output thereof,
an output transducer for convening electrical signals at an input thereof to acoustical information at an output thereof;
a plurality of bandpass filters, each bandpass filter having an input connected to said output of said input transducer;
a plurality of multiplicative AGC circuits, each individual multiplicative AGC circuit associated with a different one of said bandpass filters and having an input connected to
the output of its associated bandpass filter and an output summed with the outputs of all other ones of said multiplicative AGC circuits to form a summed output, said summed output connected to the input of said output transducer, each multiplicative AGC circuit comprising an envelope detector element having an input connected to said output of said first amplifier element, a cutoff frequency and an output, said cutoff frequency being a monotonic function of the center frequency of said bandpass filter associated with said multiplicative AGC circuit, a first amplifier element having an input and an output, said input connected to said output of said envelope detector element, said first amplifier element having a gain of l/emax, where emax is the maximum value of an audio envelope to be presented to said multiplicative AGC circuit for which AGC amplification is to result, a logarithmic element having an input connected to said output of said first amplifier element, said logarithmic element having an output carrying a signal proportional to the logarithm of the value of said signal at said input, a second amplifier element having an input and an output, said input connected to said output of said logarithmic dement, said second amplifier having a gain of k-1 where k is a number greater than one, an exponential element having an input and an output, said input connected to said output of said second amplifier element,
a sofi limiter element having an input connected to said output of said second amplifier element and an output, said soft limiter element having a limiter characteristic selected such that its gain is limited to a maximum vaiue equal to a preselected comfort level in a frequency band passed by the one of said bandpass filters with which its multiplicative AGC circuit is associated, and a multiplier element having a first input connected to said output of said soft limiter element, a second input connected to said input node of said multiplicative AGC circuit, and an output forming the output node of its multiplicative AGC circuit.
30. The sound discriminator system of any of claims 26-29, wherein said envelope detector dement comprises:
an absolute value element having an input and an output, said input forming the input of said envelope detector element; and
a low-pass filter clement implementing said cutoff frequency, said low-pass filter dement having an input and an output forming the output of said envelope detector element, said input connected to said output of said absolute value element.
31. A hearing compensation system as in any previous claim, wherein each said bandpass filter has a pass bandwith and wherein said pass bandwidths are not all equal.
32 A hearing compensation system as in claim 31. wherein said pass bandwidths are responsive to a base frequency for each said bandpass filter. 33. A hearing compensation system as in any of claims 31-32, wherein said pass bandwidths are proportional to a base frequency for a selected plurality of said bandpass filters.
Statement Under Article 19
US 3,945,244 (La Rosa) shows a radar receiver apparatus whose purpose is to prevent interference with the recriver by spurious signals, such as blinding of the receiver by a jamming signal. The apparatus divides the received signal into a set of frequency bands, and reduces the gain for one such band when the received signal is too strong in that band There is no attempt to avoid distortion of the incoming signal.
The La Rosa system does not show or suggest the particular AGC techniques of the present invention, nor does it show or suggest the particular division of the auditory frequency space of the present invention. Claim 30 recites that the pass bandwidths of the plurality of bandpass filters are not all equal; claim 31 further recites that they are responsive to the base frequency for each bandpass filter; claim 32 further recites that they are proportional to the base frequency for each bandpass filter.
The La Rosa system would not be applicable to hearing aids. The techniques used therein, if used without the disclosures of the present invention, would cause extreme sound distortion if applied to auditory signals and would not satisfy common requirements for hearing aids. Thus, even if the La Rosa system were similar to the present invention, it would still involve an inventive step to apply that system to hearing aid systems.
Accordingly, the claims recite subject matter which involves an inventive step over the cited art.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU30928/95A AU695115B2 (en) | 1994-07-08 | 1995-07-07 | Hearing aid device incorporating signal processing techniques |
| EP95926613A EP0770316B1 (en) | 1994-07-08 | 1995-07-07 | Hearing aid device incorporating signal processing techniques |
| CA002194583A CA2194583C (en) | 1994-07-08 | 1995-07-07 | Hearing aid device incorporating signal processing techniques |
| DK95926613T DK0770316T3 (en) | 1994-07-08 | 1995-07-07 | Hearing aid with signal processing techniques |
| DE69531828T DE69531828T2 (en) | 1994-07-08 | 1995-07-07 | HEARING AID WITH SIGNAL PROCESSING TECHNIQUES |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/272,927 US5500902A (en) | 1994-07-08 | 1994-07-08 | Hearing aid device incorporating signal processing techniques |
| US08/272,927 | 1994-07-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1996002120A1 WO1996002120A1 (en) | 1996-01-25 |
| WO1996002120B1 true WO1996002120B1 (en) | 1996-02-29 |
Family
ID=23041862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1995/008275 WO1996002120A1 (en) | 1994-07-08 | 1995-07-07 | Hearing aid device incorporating signal processing techniques |
Country Status (7)
| Country | Link |
|---|---|
| US (2) | US5500902A (en) |
| EP (1) | EP0770316B1 (en) |
| AU (1) | AU695115B2 (en) |
| CA (1) | CA2194583C (en) |
| DE (1) | DE69531828T2 (en) |
| DK (1) | DK0770316T3 (en) |
| WO (1) | WO1996002120A1 (en) |
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- 1995-07-07 WO PCT/US1995/008275 patent/WO1996002120A1/en active IP Right Grant
- 1995-07-07 DK DK95926613T patent/DK0770316T3/en active
- 1995-07-07 DE DE69531828T patent/DE69531828T2/en not_active Expired - Lifetime
- 1995-07-07 EP EP95926613A patent/EP0770316B1/en not_active Expired - Lifetime
- 1995-07-07 CA CA002194583A patent/CA2194583C/en not_active Expired - Fee Related
-
1996
- 1996-01-12 US US08/585,481 patent/US5848171A/en not_active Expired - Lifetime
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