Method and apparatus for enhancing voice signal in noisy environment

1. A method of enhancing a voice signal received by a reception terminal from a transmission terminal, the method comprising:

detecting a magnitude of a noise signal peripheral to the reception terminal;

checking a volume level which is set in the reception terminal while the voice signal is received from the transmission terminal; and

increasing, in the reception terminal, at least one of a volume of the voice signal included in each of a plurality of frequency bands and a volume of a portion of the voice signal included in a portion less than all of the frequency bands, on the basis of the magnitude of the noise signal and the checked volume level.

2. The method of claim 1 , wherein the increasing at least one of the volume of the voice signal and the volume of the portion of the voice signal comprises:

increasing the volume of the voice signal by a first amount when the checked volume level is a first level; and

increasing the volume of the voice signal by a second amount, less than the first amount, when the checked volume level is a second level, greater than the first level.

3. The method of claim 1 , wherein the increasing at least one of the volume of the voice signal and the volume of the portion of the voice signal comprises:

increasing the volume of the portion of the voice signal by a first amount when the checked volume level is a first level; and

increasing the volume of the portion of the voice signal by a second amount, greater than the first amount, when the checked volume level is a second level, greater than the first level.

4. The method of claim 1 , wherein the increasing at least one of the volume of the voice signal and the volume of the portion of the voice signal comprises:

increasing the volume of the portion of the voice signal by a first amount when the checked volume level is a first level; and

increasing the volume of the portion of the voice signal by a second amount, exponentially greater than the first amount, when the checked volume level is a second level, greater than the first level.

5. The method of claim 1 , wherein the increasing at least one of the volume of the voice signal and the volume of the portion of the voice signal comprises:

increasing at least one of the volume of the voice signal and the volume of the portion of the voice signal by a first amount when the magnitude of the noise signal has a first value; and

increasing at least one of the volume of the voice signal and the volume of the portion of the voice signal by a second amount, greater than the first amount, when the magnitude of the noise signal has a second value greater than the first value.

6. The method of claim 1 , wherein the increasing at least one of the volume of the voice signal and the volume of the portion of the voice signal comprises:

increasing at least one of the volume of the voice signal and the volume of the portion of the voice signal such that a magnitude of the increased voice signal or the increased portion of the voice signal does not exceed a maximum magnitude value of the voice signal corresponding to the checked volume level, on the basis of maximum voice magnitude information for each volume which represents the maximum magnitude value of the voice signal which the reception terminal outputs for each volume level.

7. The method of claim 1 , wherein the increasing of the volume of the portion of the voice signal comprises:

dividing the voice signal into the plurality of frequency bands for the voice signal; and

increasing the volume of the portion of the voice signal comprised in a first frequency band of the plurality of frequency bands.

8. The method of claim 1 , wherein the detecting the magnitude of the noise signal comprises detecting the magnitude of the noise signal received by the reception terminal before receiving a voice signal from a user and the voice signal from the transmission terminal.

9. The method of claim 8 , wherein the detecting the magnitude of the noise signal received by the reception terminal before receiving the voice signal from the user and the voice signal from the transmission terminal comprises detecting the magnitude of the noise signal by converting the noise signal into a frequency domain and detecting an energy magnitude of the converted noise signal.

10. An apparatus which enhances a voice signal received from a transmission terminal, the apparatus comprising:

a noise detection unit comprising a processor which detects a magnitude of a noise signal peripheral to a reception terminal;

a voice reception unit which receives the voice signal from the transmission terminal;

a volume level check unit which checks a volume level which is set in the reception terminal while the voice signal is received from the transmission terminal; and

a voice enhancement unit which increases at least one of a volume of the voice signal included in each of a plurality of frequency bands and a volume of a portion of the voice signal included in a portion less than all of the frequency bands, on the basis of the magnitude of the noise signal and the checked volume level.

11. The apparatus of claim 10 , wherein the voice enhancement unit increases the volume of the voice signal by a first amount when the checked volume level is a first level, and increases the volume of the voice signal by a second amount, less than the first amount, when the checked volume level is a second level, greater than the first level.

12. The apparatus of claim 10 , wherein the voice enhancement unit increases the volume of the portion of the voice signal by a first amount when the checked volume level is a first level, and increases the volume of the portion of the voice signal by a second amount, greater than the first amount, when the checked volume level is a second level, greater than the first level.

13. The apparatus of claim 10 , wherein the voice enhancement unit increases the volume of the portion of the voice signal by a first amount when the checked volume level is a first level, and increases the volume of the portion of the voice signal by a second amount, exponentially greater than the first amount, when the checked volume level is a second level, greater than the first level.

14. The apparatus of claim 10 , wherein the voice enhancement unit increases at least one of the volume of the voice signal and the volume of the portion of the voice signal by a first amount when the magnitude of the noise signal has a first value, and increases at least one of the volume of the voice signal and the volume of the portion of the voice signal by a second amount, greater than the first amount, when the magnitude of the noise signal has a second value greater than the first value.

15. The apparatus of claim 10 , wherein the voice enhancement unit increases at least one of the volume of the voice signal and the volume of the portion of the voice signal such that a magnitude of the increased volume of the voice signal or the increased volume of the portion does not exceed a maximum magnitude value of the voice signal corresponding to the checked volume level, on the basis of maximum voice magnitude information for each volume which represents the maximum magnitude value of the voice signal which the reception terminal outputs for each volume level.

16. A non-transitory computer-readable recording medium storing a program for executing the method of claim 1 .