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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of adjusting a frequency characteristic of a hearing aid or similar hearing enhancement
device (hereinafter referred to as a hearing aid).
2. Description of the Related Art The adjustment of the frequency characteristics of a
conventional hearing aid has been carried out by the circuits shown in FIGS. 1 and 2 both adjust
the characteristics with a single variable element, and the respective characteristics are shown in
FIGS. 1-1 and 2-1. Its characteristics are flat to high band attenuation characteristics and flat to
low band attenuation characteristics, and the loudness of the hearing aid wearer changes with
the change of the variable element to make the frequency characteristic fit to the best condition
at a hearing aid specialist store. It was done.
In recent years, the circuit shown in FIG. 3 having two variable elements capable of
independently adjusting the high frequency characteristic and the low frequency characteristic is
used. Since this circuit is known as a tone control circuit of an audio amplifier, details are
omitted. In any case, it was difficult for the hearing aid wearer to adjust the sound quality on its
own because the adjustment of the sound quality affects the immediate loudness, and it had to be
adjusted by a doctor or a hearing aid specialist.
Problems to be Solved by the Invention It has been said that even a hearing aid (called fitting)
adjusted by the expert's hand does not necessarily give satisfaction to the hearing aid wearer. It
is said that because it is adjusted by a limited examination, it does not meet the conditions of the
sound in the real life place of the hearing aid wearer.
As the speaker's side changes the range depending on whether they are old or young, it may be
necessary for the wearer to make fine adjustments that can be adjusted by themselves. It is also
conceivable that the adaptation status may change due to adjustment under various noises and
psychological changes due to the environment of the hearing aid wearer.
In particular, how to hear each deaf person is that there is no examination method that other
people can know because the hearing nerves are involved.
Therefore, the present invention is to provide a hearing aid provided with a method by which a
deaf person can adjust to the optimum value by himself.
A frequency characteristic is continuous from monotonous high-frequency enhancement of
frequency proportionality to monotonous low-frequency enhancement of frequency inverse
proportionality without changing the level of this point centering on the reference frequency fo.
It has a function that can be variably set, and a function that can set the reference frequency fo at
an arbitrary point independently of the change of the frequency characteristic.
[Operation] If the setting of this fo is set in advance to the point that it does not change the
loudness (the amount of sense of the loudness) even if the frequency characteristics are changed
for each deaf person, the change of the frequency characteristics is Because there is no
accompanying change in loudness, the hearing aid user can easily adjust the frequency
characteristics of the hearing aid to the point where the speech is best heard.
EXAMPLES Examples of the present invention will be described below.
FIG. 4 is a block diagram of the present invention. The signal from the microphone is A / D
converted and input to the CPU.
The CPU processes the digitized signal by built-in software, D / A converts it, and outputs it to the
earphone. The software uses an implementation routine such as a digital filter, a digital equalizer,
etc., and the control is setting of a frequency characteristic command, reference frequency fo,
amplification setting, etc. In order to realize the filter and the equalizer, known methods such as
convolution method and non-recursive filter method are used. The characteristics are shown in
According to the method of the present invention, the initial setting of the hearing aid is based on
the point that the loudness of the hearing aid wearer does not change even if the frequency
characteristic is changed from the high range enhancement to the low range enhancement by the
expert. In the case of a hearing aid whose setting of fo has been made by setting the frequency
fo, the hearing aid wearer only varies the frequency characteristics and looks for a point where
words can be heard clearly, so various noise conditions The best adjustments are easy, as the
words of the young and old can clearly be heard even under the bottom.