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DESCRIPTION JPS6166499

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DESCRIPTION JPS6166499
[0001]
The present invention relates to an ear piece, and in particular to a lumo of a telephone receiver
or headphone for correcting a single-sized hearing loss. The technical field relating to the
invention belongs to the telephone or radio listening apparatus. Of the total population, a
perceptible percentage of people suffer from a lack of hearing, this deficit is generally
represented by a poor perception of sound (sound), and this sound comprises The location and
width of this frequency is variable by the individual. People with hearing difficulties sometimes
encounter difficulties when making calls or using a radio or telephone head 7 ore. This is because
the voice is subject to deformation and it makes it difficult to understand who they are talking to.
One of the objects of the present invention is to provide earpieces incorporated in a telephone or
headphone, and since these earpieces are self-contained ones having a hearing impairment 'm He
can own his own phone or head 7 and adjust it to compensate for his own lack of hearing and
use this device for any phone or wireless transmitter It will be possible to move with your own
handset or head 9 foun. According to another object of the invention, it is an object to provide a
self-contained telephone handset with a built-in power supply, since adjustable electronic
circuitry is installed in the handset. This electronic circuit can correct the user's own deficit in
hearing and can connect the handset or head 7 of these individuals to a telephone or radio
receiver by means of an inductive electromagnetic sensor or a wireless link. As a result, these
handsets can be used with the telephone device without further wiring, and there is an advantage
that it is not necessary to obtain the permission of the telephone company for this connection.
Also, according to the present invention, a telephone hand which can be mass-produced and
which can be adjusted individually based on the user's hearing loss lid or can be adjusted
according to the shortage amount of several people who use it subsequently It is to provide an
ear piece incorporated in the cent or head 7 on. Also, the Tele 2 on Handset for the hearing
impaired is known, and is equipped with a variable gain amplifier, which can amplify sounds of
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all frequencies.
Also known are special telephone earpieces for the hearing impaired who are equipped with a
hearing aid. The earpieces are coupled to a magnetic coil from which an electromagnetic signal is
transmitted by induction to a hearing aid provided at the location (T) of the telephone. However,
the first of these known devices can improve the perception of sound by increasing the level of
the general sound, but a correction tailored to the user's unique hearing deficit It can not be
done. According to the second known device, it is possible to make a call using a hearing aid, but
it is not possible to make corrections other than this hearing aid correction. Different objects
exist for the device according to the invention. In general, perception by the deaf person's ear
creates difficulties for sounds in a predetermined frequency range. The non-inventive device
allows special modification of the sound, which makes it possible to correct the sensitivity curve
of the ear. This is achieved by augmenting the frequencies that are hardly perceived by the ear,
so that all frequencies can be heard with almost the same sensitivity and acoustically by the user
of the earpiece according to the invention The sharpness is substantially uniform over the entire
audio frequency. These objects of the invention can be realized by means of an earpiece, in
particular a telephone handset or an earpiece of the head 7 on. That is, the earpiece is provided
with an electronic low / 9 filter and electronic means by which the user can adjust the center
frequency and / or bandwidth of the passband of the filter. These means are provided in the
mobile support of the earpiece. The earpiece according to the invention is characterized in that it
is provided with a variable gain preamplifier and means by which this gain can be adjusted.
According to an embodiment of the present invention, the means for changing the center
frequency and / or the bandwidth of the pass band of the filter described above is provided with
an electronic switch integrated in the filter, the resistance value of which in the gate of the
switch. It fluctuates as a function of the period ratio of the applied rectangular pulse signal
sequence, and further, means is provided to feed this pulse signal sequence to the date of these
switches and to change the period ratio of the pulse sequence. It is characterized by According to
the invention, a novel earpiece is obtained, which is provided with a circuit which allows a person
with hearing loss to correct the radiation on the earpiece by means of electronic means.
For this reason, this latter measure can represent an enhancement of the electronic and acoustic
signals in the passband, which covers almost the entire band in which the user's auditory deficit
is present. it can. The ear pieces according to the invention have the advantage that they can be
mass-produced to the same model, and thus have features that can be adjusted individually
according to the user's own requirements. The earpiece according to the invention also makes it
possible to produce a self-contained telephone handset or ear7on, which devices can be
transported by the user and without any special connection elements. Can also be connected, and
as a result, people with hearing loss who have a lack of sound that is difficult to understand who
is talking on the phone can correct his own deficit and call from any phone Can. By means of the
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ear sleeve according to the invention provided with correction means provided on each ear piece
and adapted to the lack of the ear to which this ear piece is attached, in particular two selfcontained ears. The head 7-on can be manufactured with the piece, and adjusted by the user to
be able to independently correct each ear piece as a function of the deficit of each ear. Such
personal earphones can be used by the operator. This operator's task is to carry an earphone,
such as a switch, a traffic controller, a radio reporter, etc. In opposition to the correction means
incorporated in the telephone device, a telephone sessoto or headphone which can be used
individually and which can be carried from one set to the other by means according to the
invention directly incorporated into the earpiece. It can be manufactured. The invention will now
be described in detail with reference to the drawings. FIG. 1 represents an earpiece 1, which is an
electrical echo transducer of a known type, for example an earpiece of a telephone or wireless
headphone. FIG. 1 shows a telephone earpiece 1 connected to a telephone set by an
electromagnetic induction sensor 2. The sensor 2 is provided in a suction camp provided for a
telephone device and connected to the incoming canonot 4 by a flexible cord 3. Such sensor and
cable links can be replaced by wireless links such as those found in portable telephone handsets.
The electronic circuitry is incorporated into the support of the earpiece, such as in a telephone
set or hedodophone.
The electronic circuit is provided with a variable gain preamplifier (preamplifier) 5. Reference 6
represents a potentiometer, by means of which the gain of the preamplifier can be adjusted. The
signal passing through this pre-amplifier is provided as a pass band filter. The filter is provided
with two operational amplifiers 7 and 8 which are combined with electronic switches 9.11. These
electronic switches can, for example, also be switches forming part of the integrated circuit
CD4016 commercially available from NATIONALS EMI CO., LTD. Four switches are formed on
the same wafer in this IC. Each of these switches is provided with three terminals, which are an
input terminal, an output terminal and a date terminal. The resistance between the input and
output terminals varies continuously from O to 10 Ω, depending on the period ratio of the
constant frequency rectangular 9-pulse train applied to y-t. By means of the electronic switches 9
and 10, the potentiometer 13 can be actuated, thereby changing the center frequency of the pass
band of the filter. The electronic switches 9 and 10, and the other switches 1 and 12 are
controlled in parallel by means of the cycle ratio of the rectangular / IP string. Reference 15
designates an astable multivibrator which generates a triangular voltage (of constant frequency).
That is, this voltage is a voltage that gradually increases at a constant slope and decreases
rapidly. This voltage is supplied in parallel to the input terminals of the same polarity of the two
operational amplifiers 16.17. These amplifiers 16.17 are wired as comparators, thereby
comparing this voltage with a reference voltage and adjusting this reference level by means of
potentiometers I J, 14tlC. As long as the increasing voltage is lower than the applied reference
voltage, these comparators J6 or J7 output a signal of a predetermined level, for example, a zero
level. When the increasing voltage becomes higher than the applied reference voltage, the
comparator 16 or 17 outputs a signal of the opposite level to that described above. Therefore, a
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rectangular pulse train is outputted from each of the comparators 16 and 17, and the frequency
of this 4-pulse train is constant and equal to the frequency of the astable multivibrator.
The period ratio of this, ie, the ratio of the duration of these pulses to the period of the interval
separating the two pulses, is the ratio of the reference voltage applied to the inputs of the
comparators 16 and 17 by It changes as a function. FIG. 2 is an embodiment of the device
according to FIG. The sensor 2 shown in FIG. 2 is, for example, an inductive sensor, which is
connected by a flexible cord 3 to the input terminal 4 of this device. In the rectangle 5 indicated
by a broken line in FIG. 2, an embodiment of the preamplifier composed of two transistors T and
T2 is shown. The reference number 6 represents a potentiometer, by means of which the gain of
the preamplifier 5 can be varied. Reference numeral 7 is an operational amplifier, which is
provided with a negative feedback loop. An electronic switch 9 is provided therein, by means of
which the resistance of the negative feedback loop can be varied continuously. The amplifier 7
and the negative feedback loop constitute a selective amplifier, and the pass band can be
changed by changing the negative feedback loop. Reference numeral 18 denotes a potentiometer,
which is adjusted at the time of manufacture, by means of which the limit on which the center
frequency of the passband can be varied can be adjusted. The output of this potentiometer 18 is
connected to an assembly of filter capacitors C1, C2, C3 and C4, which are connected in parallel
with the capacitors C5 and C6. The capacitor C2 is connected in series with the electronic
variable resistance switch 1 '. Similarly, capacitors C 3 and C 4 f are connected in series with the
electronically variable resistance switch 12. These capacitors and resistors make up a bandpass
filter, and the bandwidth of this filter can be varied by continuously changing the resistance of
the electronic switch 11.12. The reference numeral 8 designates a second selection amplifier
which comprises an electronically variable resistance switch 10 in its negative feedback loop. By
forming a band pass filter by the first and second selective amplifiers 7.8 and changing the
resistance of the switches 9 and 10, it is possible to change the center frequency of the band of
this filter. Reference numeral 15 denotes an astable multivibrator, which generates a triangular
wave voltage of a constant frequency. This multivibrator can, for example, consist of an MA741
type integrated circuit commercially available from FAIRCHILD.
The output of the multivibrator 15 is supplied in parallel to the negative terminals of the two
operational amplifiers 16.17. Each of the positive terminals of these amplifiers 16.17 are
connected to two potentiometers 13.14, by means of which the reference voltages applied to the
positive terminals can be varied independently. The gradually increasing voltage supplied by
each of the amplifiers 16.17 from the multivibrator 5 is compared with the reference voltage and
the rectangular shaped pulse is output during all time periods when the variable voltage is higher
than this reference voltage) You will come to The width of these pulses, and thus the period ratio
of the i4 series output by the comparators 16, 17, is a function of the reference voltage and also
of the position of the potentiometer 13.14. FIG. 2 shows two pulses of the same frequency and
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different cyclic ratios, ie, 19 ° 20. By means of the comparator circuit, a 4-wire h, fc / 4-k signal
sequence 19 is fed in parallel to the date of the electronic switches 9 and 10. The resistance
values of these switches vary as a function of the period ratio of the signal string 19). Therefore,
the potentiometer 13 can change the center frequency of the pass band of the filter constituted
by the selective amplifiers 7 and 8. Similarly, this 9-pulse signal sequence 20 obtained by this
comparator 17 of two electronic switches 11.12? Feed in parallel to-). The resistance value of
these switches changes as a function of the period ratio of the pulse signal train 20. Therefore,
the potentiometer 14 can change the width of the pass band of the filter. FIG. 3 is a perspective
view of a telephone according to the present invention. The handset 21 VC is provided with an
assembly of the circuit according to FIG. 2 at the part where the microphone is connected to the
earpiece, and this assembly 11 can be formed by an integrated circuit for space saving. Also, a
direct current source 26, eg a battery or a small rechargeable battery, is provided to supply
power to these circuits. Also, three bumps 22. 23 and 24 are thrown into the handset 2, which
acts on the potentiometer 6. This adjusts the preamp gain 5 so that the overall sound level can be
adjusted. The potentiometers 13 and 14 are controlled by the projections 23 and 24 to adjust the
center frequency of the pass band and the width of this band.
For example, the center frequency can be adjusted between 800 Hz and 4.5 kH2 and the
passband width can be varied between 100 Hz and 3 kHz. Since the position and width of the
passband can be adjusted independently, the device according to the invention can individually
correct its own deficits in hearing, and usually also for partial deficits encountered in the case of
hearing loss. All can be corrected with satisfaction. Further, the handset 2 is provided with a
flexible cord, and the suction cup sensor 2 is attached to one end of the coat 9 so that the sensor
2 can be attached to the telephone without connection. According to another embodiment, the
link between the handset 2 and the telephone can be a wireless call link. The handset 21
according to the invention is a self-contained handset for the built-in power supply and sensor 2.
A person with hearing loss has such a note set '1 and has the effect of being able to correct it
according to his / her shortfall and also to carry it while traveling and to call it from any
telephone. FIG. 3 is an embodiment of a handset in which all handset parts are mass-produced at
the same deadin, and each user can adjust his / her own set according to his / her shortage. Also
according to the invention, a plug-in module type filter can be provided, in which case the
physician can measure the patient's audiogram and estimate the position and bandwidth of the
center frequency based thereon. Here the hearing is defective and the physician can provide a
plug-in filter in the handset to correct the patient's personal deficit. FIG. 3 shows a self-contained
and personalized telephone hunt cent. Here, a filter incorporated in the door door and a selfcompleted personal telephone handshake that allows the user to adjust the position and / or
passband of the center frequency of the filter is disclosed. Also, in the case of headphones having
two earpieces, people with hearing loss sometimes do not have the same deficit in both ears, and
it is preferable to incorporate two filters into the honedoor. By incorporating each filter into each
ear piece, the user can adjust separately to six ears. Also, the electronic circuit of FIG. 2 only
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specifies one embodiment. It is also possible to replace the Mata, Pantonos and filters and the
means for adjusting the center frequency and bandwidth of this filter by other equivalent
electronic means capable of adjusting such filtering functions.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of the main components of the device according to the invention, FIG. 2
is a diagram of an embodiment of the device of FIG. 1, and FIG. 3 is a perspective view of a
telephone handset according to the invention.
DESCRIPTION OF SYMBOLS 1 ... ear piece, 2 ... sensor, 5, 7.8 ... amplifier, 9-12 ... electronic
switch, no 5 ... astable multivibrator, 16.17 ... comparator , 6, 13.14 ... potentiometer, 2 ... ...
telephone handset, 25 ... ... accelerator.
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