Hearing aid and method for controlling the same

1. A hearing aid comprising

a hardware processor, the hardware processor being configured to:

produce a spectrum signal which indicates a frequency component included in a first acoustic signal received by a microphone;

calculate, using the spectrum signal, a control gain value;

amplify the first acoustic signal using the control gain value to produce the second acoustic signal;

detect a predetermined sound in the first acoustic signal from the spectrum signal, the predetermined sound occurring abruptly;

produce a plurality of control signals, each of which indicates a corresponding one of suppression amounts each of which is allocated to a corresponding one of a plurality of frequency components in the predetermined sound in the first acoustic signal;

apply at least one of the control signals to the second acoustic signal to attenuate the predetermined sound in the second acoustic signal;

output at least one of the control signals; and

control the control gain value calculated using the spectrum signal, using a calculation based on the at least one of the outputted control signals,

wherein the hearing aid further comprises:

a volume adjusting switch for a user to input a volume adjusting amount for adjusting a volume of an output sound signal of the hearing aid; and

a variable gain controller to control a gain value according to the input volume adjusting amount, the gain value being applied to the second acoustic signal to adjust the volume of the output sound signal, and

wherein the hardware processor is further configured to:

increase or decrease the at least one of the control signals applied to the second acoustic signal based on a difference between the adjusted volume of the output sound signal and a predetermined reference value, when the adjusted volume of the output sound signal is lower than the predetermined reference value.

2. The hearing aid according to claim 1 ,

wherein the hardware processor is further configured to

delay the at least one of the control signals applied to the second acoustic signal by a time difference between first time and second time,

wherein the first time is required for amplifying the first acoustic signal, and

wherein the second time is required for detecting the predetermined sound.

3. The hearing aid according to claim 1 ,

wherein the hardware processor is further configured to output at least one of the control signals which includes a control signal having a minimum suppression amount among the suppression amounts each of which is allocated to the corresponding one of the frequencies included in the control signals.

4. The hearing aid according to claim 1 ,

wherein the hardware processor is further configured to output at least one of the control signals which includes a control signal having a maximum suppression amount among the suppression amounts each of which is allocated to the corresponding one of the frequencies included in the control signals.

5. The hearing aid according to claim 1 ,

wherein the one of the plurality of frequency components is included in a first frequency band in the predetermined sound in the first acoustic signal, and

the control gain value calculated using the spectrum signal is included in the first frequency band.

6. The hearing aid according to claim 1 ,

wherein the hardware processor is further configured to:

suppress the predetermined sound in a rise zone which is a time zone where an amplitude of the predetermined sound drastically varies;

keep the control gain value in the rise zone; and

control the control gain value based on the at least one of the outputted control signals in a subsequent zone which is a time zone after the rise zone until the predetermined sound being no longer observed.

7. The hearing aid according to claim 1 ,

wherein the predetermined reference value is a maximum volume of the output sound signal which can be adjusted by the volume adjusting switch.

8. The hearing aid according to claim 7 , further comprising

storage configured to record a history of the volume adjustment amount adjusted by the volume adjusting switch,

wherein the reference value is determined based on the history of the volume adjustment amount recorded in the storage.

9. A method for controlling a hearing aid including a hardware processor, the method comprising:

producing a spectrum signal which indicates a frequency component included in a first acoustic signal received by a microphone;

calculating, using the spectrum signal, a control gain value;

amplifying the first acoustic signal using the control gain value to produce the second acoustic signal;

detecting a predetermined sound in the first acoustic signal from the spectrum signal, the predetermined sound occurring abruptly;

producing a plurality of control signals, each of which indicates a corresponding one of suppression amounts each of which is allocated to a corresponding one of a plurality of frequency components in the predetermined sound in the first acoustic signal;

applying at least one of the control signals to the second acoustic signal to attenuate the predetermined sound in the second acoustic signal;

outputting at least one of the control signals; and

controlling the control gain value calculated using the spectrum signal, using a calculation based on the at least one of the control signals output in said outputting,

receiving a volume adjusting amount for adjusting a volume of an output sound signal of the hearing aid;

controlling a gain value according to the input volume adjusting amount, the gain value being applied to the second acoustic signal to adjust the volume of the output sound signal; and

increasing or decreasing the at least one of the control signals applied to the second acoustic signal in said applying based on a difference between the adjusted volume of the output sound signal and a predetermined reference value, when the adjusted volume of the output sound signal is lower than the predetermined reference value.

10. The hearing aid according to claim 1 ,

wherein the hardware processor is further configured to calculate a suppression amount based on the predetermined sound in the first acoustic signal, and the suppression amount is used to attenuate the predetermined sound in the second acoustic signal.

11. The hearing aid according to claim 1 ,

wherein the control gain value indicates, for each of a plurality of frequencies, an amount of amplification of the first acoustic signal, according to an ability of a user to hear sound in each of the plurality of frequencies.