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Specification 1, Name of Invention Hearing Aid
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of hearing aids for correcting hearing loss, in particular hearing aids with sound pressure
compression. An object of the present invention is to provide a hearing aid capable of almost
linear compression, amplification and reproduction of an input signal within an arbitrary sound
pressure dynamic range most easily heard by a deaf person using the hearing aid. Another object
of the present invention is to not distort the repeat signal while achieving the above object. Yet
another object of the present invention is to provide a quick response limitation function that
protects the ear against excessive power. Still another object of the present invention is to
provide a circuit configuration that is easy to solve. Still another object of the present invention is
to provide a configuration that is resistant to fluctuations in temperature and power supply
voltage without variations between processes C. In the case of an auditory listener, as shown in
FIG. 1, the sensitivity is usually lower than that of a normal person for minute input sound
pressure, but EndPage: 1 is almost the same as that for a normal person for input sound pressure
above one foot level. It has the characteristic of being able to obtain sensitivity. If you use a
hearing aid that has a certain amplification level regardless of the input sound pressure level, the
amplification level is set to the appropriate level for low-level input sound pressure that is
difficult to hear. The level of input sound pressure is too much amplification, and it feels very
loud, and in extreme cases it causes pain in the ear, etc. It is rather inconvenient side gets bigger
7co Eliminates these drawbacks In the past, so-called "AGC! ″″’ARC! 0 Conventional
sound pressure compression circuits using various sound pressure compression circuits with the
names such as “′ ′ etc. have the same basic configuration with different details, and
constitute a hearing aid from the output amplifier output It has a scheme in which feedback is
given to any input of each output stage. In particular, a diode or the like that exhibits non-linear
resistance with respect to the applied voltage is often used in the portion where the feedback
amount is determined. The representative example is described according to FIG. 2 and FIG. The
outline of the configuration is shown in FIG. Preamplifier 2. ボリウム3. Main amplifier 4. The
output amplifier 5 usually includes a zero sound pressure compression circuit which is the
output amplifier 5 and the earphone 6 and may also include a tone control circuit and the like.
The details are shown in FIG. The output from the main amplifier 4 is passed through a capacitor
7 ° base resistor 10 and input to the base of the transistor 12 for driving the earphone. In
addition, anti-parallel diodes 16.
A feedback is made from the collector side to the base side of the transistor 12 by a capacitor 8
and a dividing trimmer 9 to control the amplification degree and perform sound pressure
compression. Therefore, the operation of 7 has a serious disadvantage that the output becomes
large and the feedback amount becomes exponentially large as shown in FIG. 4, and the output
waveform is largely distorted. Further, as shown in FIG. 5, when the division trimmer 9 is
operated for sound pressure compression with respect to the flat input / output characteristic
16, the characteristic is equal to or higher than the input sound pressure level of 17.18. The
output sound pressure becomes constant at this time, and when the sound pressure compression
amount is made constant as shown in FIG. It is an input / output characteristic, and shows a
sound pressure compression characteristic such that the output sound pressure is clipped at a
certain level. With such characteristics of sound pressure compression, the sleeve of the deafness
curve shown in FIG. 1 does not become positive. For this reason, as shown in FIG. 7, if the
sensitivity characteristic 21 of the original sister and listener is corrected by the abovementioned hearing aid with sound pressure compression function and it is intended to be
included in the sound pressure dynamic range 26 easy to hear for the deaf The sensitivity
characteristics of the fc deaf person are as shown in 22. Even the narrow deaf person's optimum
audible dynamic sound pressure range is not used at all as movable. This means that the hearing
aid who uses a conventional hearing aid (with sound pressure compression function) at laughs
should be able to have various levels of speech, noise, etc. at almost the same level and with a
large audible limit. Sounds 0 You can hear it by sound, and it will end up with a strong distortion
5-, and the sound will be loud, but you may feel as if the intelligibility will fall back and it will be
a big complaint etc. 0 is more susceptible to the temperature of the power supply voltage, ■ ■ C
will vary greatly when converted to 0 0 The present invention as described above, such as thick
distortion, dynamic range tw effect to use The present invention is intended to radically improve
a conventional hearing aid with a sound pressure compression function, and will be described
according to an embodiment below. FIG. 8 shows an embodiment of the present invention, and
FIG. 9 is inputted to a microphone 24 which is a part of a specific circuit example thereof and is
amplified by about 20 aB by the preamplifier 25. , 28 after the gain is attenuated by the gain
control unit 27. Main amplifier 29, output amplifier 30 '! ! The zero control code generation unit
26 output to the earphone 61 passes the control signal to the gain control unit 27 using the
output of the preamplifier 25 as an input.
The control signal generating unit 26 includes an amplifying unit 33, a rectifying and smoothing
unit 34.n, as shown in FIG. A / D 6-EndPage: 2 conversion unit 35, which outputs a digital output
proportional to the input sound pressure level to the gain control unit 27. The gain control unit
27 is constituted by a D / A converter which receives the output of the preamplifier 25 at a
reference voltage input terminal and receives a digital setting signal from the control signal
generating unit 26. The gain control amount is set by arbitrarily setting the characteristics of the
A / D converter 35 or the D / A converter and both of them. As shown in FIG. 10 using the above
embodiment, an example of setting the attack time of the Q-10,000 rectifying and smoothing
unit 64 to 10 ms and the release time to 0.5 to 1 second, which can be arbitrarily determined. If
you have a deaf person with good deafness characteristics 43 want to think about using the
compression compression function hearing aid according to the present invention 0 0 In the case
of this deaf person, 60 dB when considered at 60 dB or more of the background noise level of a
normal conference room It has a characteristic that at 20 dB it returns to almost the same
sensitivity as normal one. Therefore, the attenuation as shown in Fig. 11 is achieved by providing
the basic hearing aid with an acoustic gain of 20 dB and adjusting the D /, p and D / A
conversion 4H'l (I + near day, gain) of the converter. If the characteristic 44 is given to the gain
control section 27 (!: Can be considered, considering the hearing aid total as a whole, the sound
pressure H having a compression function according to the present invention having the input /
output characteristic 45 as shown in FIG. The above-mentioned deaf person using a hearing aid
will have a corrected hearing sensitivity 47 as shown in FIG. 46 is the original hearing sensitivity.
Therefore, according to the present invention, it is possible to make corrections that are as close
as possible to the ordinary person's hearing, at the favorite dynamic range and at the favorite
depth, so that it is light and severe. It became possible for a single person to have a comfortable
listening experience, in which both the severe and the deaf people could listen in a form close to
nature with the 'fc optimum hearing level' in accordance with the deafness characteristics of the
deaf person. In addition, since the negative feedback is applied and the release time is 0.5 to 1
second, the damping ratio is instantaneously irrelevant to the fluctuation in the direction of
decreasing the peak level of the input speech signal. Therefore, as shown in FIG. 14, since the
input signal waveform 48 similarly becomes the output signal waveform 49, almost no distortion
occurs, so the intelligibility does not decrease. In addition, since the cane control unit 27 is
brought forward as much as possible, the signal is less likely to be attenuated after being clipped,
which is necessary in order not to generate distortion over a wide range. is there.
The animal has an attack time of about 10 tnsec, so it also has an output limiting function with
sufficient response for practical use. し か も And, A / D, D / A conversion of sensing and gain
setting of input sound pressure level Unlike performing gain setting by voltage division using the
transistor's unsaturated region to perform the system, there is little variation even in the case of
■ C conversion, and it is hardly affected by fluctuations in power supply voltage and
temperature. . From the above, according to the present invention, near-natural auditory
correction particularly suitable for people with sensorineural deafness can be arbitrarily
performed, and this does not adversely affect the acuity that has conventionally occurred and
causes almost no distortion. It is possible to provide a sleeve 9-hearing device with a sound
pressure compression function which also has an output restriction function. Furthermore, it is
suitable for TC formation, particularly for IAoSIC formation.
4. Brief description of the drawings Fig. 1 shows the hearing sensitivity characteristics of people
with hearing loss, Fig. 2 shows an example of the configuration of a conventional hearing aid, Fig.
6 shows the output especially including the partial compression circuit in Fig. 2. Fig. 4 shows the
input / output waveform characteristics of the conventional sound pressure compression circuit,
Fig. 5 shows the gain characteristics of the conventional hearing aid with sound pressure
compression circuit, Fig. 6 shows the compression in Fig. 5 Fig. 7 shows the corrected hearing
sensitivity characteristics of the deaf person obtained using a conventional hearing aid with a
sound pressure compression circuit, and Fig. 8 shows the configuration of the hearing aid
according to the present invention. One example, FIG. 9 is a detailed circuit example of a partial
block in FIG. 8, and FIG. 10 is an example of one example of the present invention *, deafness
sensitivity of a specific deaf person. FIG. 11 shows the attenuation characteristics obtained by the
embodiment of the present invention, FIG. 12 shows the input / output characteristics showing
the first acoustics of the embodiment of the present invention, FIG. 13 shows the one
embodiment of the present invention The corrected hearing sensitivity characteristics of the deaf
person, FIG. 14-10-EndPage: 3 show the input / output waveform characteristics in the example
of the present invention. 13 ... antiparallel diode 22 ... hearing sensitivity 24 after correction with
a conventional hearing aid 24 ... microphone 25 ... preamplifier 26 ... control signal generator 27
... gain controller 28 ... · Volume 29 · · · Main amplifier 30 · · · Output amplifier 31 · · · · · · · · · · · · · ·
earphones 35 · · A / D conversion unit 47 · · · more than the hearing sensitivity of the deaf person
after correction obtained by the embodiment of the present invention 11-6 people S) Swamp
EndPage: 4 Figure 11 EndPage: 5
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jps5568793, description
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