Method and hearing aid for enhancing the accuracy of sounds heard by a hearing-impaired listener

1. A method for enhancing the accuracy of sounds heard by a hearing-impaired listener, comprising the following steps:

(A) receiving an input sound;

(A1) determining a proportion of sound energy of the input sound below 1000 Hz;

(A2) determining a proportion of sound energy of the input sound below 6000 Hz;

(B) determining if it is necessary to modify the frequency of the input sound according to two criteria, wherein a first criteria is that the proportion of the sound energy below 1000 Hz of the input sound to all sound energy of the input sound is between 0% and 25%; and a second criteria is that the proportion of the sound energy below 6000 Hz of the input sound to all sound energy of the input sound is A %, wherein A is a value between 0 and 80; and

(C) modifying the input sound into a modified input sound if both of said two criteria are met, wherein the modified input sound comprises a plurality of sounds at different frequencies, and wherein the proportion of the sound energy below 6000 Hz of the modified input sound to all sound energy of the modified input sound is B %, wherein B is 1.15 to 10,000 times of A.

2. The method for enhancing the accuracy of sounds heard by a hearing-impaired listener as claimed in claim 1 , wherein in step (B), the proportion of the sound energy below 1000 Hz of the input sound to all sound energy of the input sound is between 0% and 20%.

3. The method for enhancing the accuracy of sounds heard by a hearing-impaired listener as claimed in claim 2 , wherein A is a value between 0 and 70.

4. The method for enhancing the accuracy of sounds heard by a hearing-impaired listener as claimed in claim 1 , 2 or 3 , wherein B is 1.3 to 10,000 times of A.

5. The method for enhancing the accuracy of sounds heard by a hearing-impaired listener as claimed in claim 1 , 2 or 3 , wherein in step (C), the input sound is modified into the modified input sound by means of frequency compression or frequency shifting.

6. A hearing aid, used for receiving an input sound and modifying the input sound so as to output a sound to a hearing-impaired listener, the hearing aid comprising:

a sound receiver, used for receiving the input sound;

a sound processing module, electrically connected to the sound receiver, used for determining if it is necessary to modify the frequency of the input sound, so as to provide a modified input sound, wherein the sound processing module is configured to make a determination whether it is necessary to modify the frequency of the input sound according to two criteria, a first criteria being that the proportion of the sound energy below 1000 Hz of the input sound to all sound energy of the input sound is between 0% and 25%; and a second criteria being that the proportion of the sound energy below 6000 Hz of the input sound to all sound energy of the input sound is A %, wherein A is a value between 0 and 80; and wherein the sound processing module is configured to, when said first and second criteria are met, modify the input sound such that the proportion of the sound energy below 6000 Hz of the modified input sound to all sound energy of the modified input sound is B %, wherein B is 1.15 to 10,000 times of A;

and

a speaker, electrically connected to the sound processing module.

7. The hearing aid as claimed in claim 6 , wherein the input sound necessary for frequency modification is characterized in that:

the proportion of the sound energy below 1000 Hz of the input sound to all sound energy of the input sound is between 0% and 20%.

8. The hearing aid as claimed in claim 7 , wherein A is a value between 0 and 70.

9. The hearing aid as claimed in claim 6 , 7 or 8 , wherein B is 1.3 to 10,000 times of A.

10. The hearing aid as claimed in claim 6 , 7 , or 8 , wherein the input sound is modified into the modified input sound by means of frequency compression or frequency shifting.