Electronic device for outputting sound and operating method thereof

1 . An electronic device comprising:

a vibration sensor;

a microphone;

memory storing at least one instruction; and

at least one processor,

wherein the at least one instruction, when executed by the at least one processor individually or collectively, cause the electronic device to:

receive, via the microphone, a speech signal including reverberation uttered by a user wearing the electronic device,

receive, via the vibration sensor, a vibration signal related to the speech signal, the vibration signal being sensed through at least a portion of a body of the user when the speech signal is uttered by the user,

identify an impulse response signal based on the speech signal and the vibration signal,

predict reverberation information based on the impulse response signal, and

eliminate the reverberation included in the speech signal based on the predicted reverberation information.

2 . The electronic device of claim 1 , wherein the reverberation information includes at least one of a reverberation time of the impulse response signal or an early-to-late reverberation ratio between early reverberation and late reverberation included in the speech signal.

3 . The electronic device of claim 2 , wherein the reverberation time is a time taken for the impulse response signal based on the speech signal and the vibration signal to be reduced by a specified strength.

4 . The electronic device of claim 1 , wherein the at least one instruction, when executed by the at least one processor individually or collectively, further cause the electronic device to:

identify a strength of each of early reverberation and late reverberation included in the speech signal based on the reverberation information, and

eliminate the reverberation included in the speech signal by subtracting the strength of the late reverberation from a strength of the speech signal.

5 . The electronic device of claim 1 , wherein the at least one instruction, when executed by the at least one processor individually or collectively, further cause the electronic device to:

identify a noise strength of the speech signal, and

based on the noise strength being not greater than a first value, eliminate the reverberation included in the speech signal.

6 . The electronic device of claim 5 , wherein the at least one instruction, when executed by the at least one processor individually or collectively, further cause the electronic device to:

identify a strength of the reverberation included in the speech signal, and

based on the strength of the reverberation included in the speech signal being greater than a second value, eliminate the reverberation included in the speech signal.

7 . The electronic device of claim 6 , wherein the at least one instruction, when executed by the at least one processor individually or collectively, further cause the electronic device to, based on the strength of the reverberation included in of the speech signal being not greater than the second value, cancel noise included in the speech signal without eliminating the reverberation included in the speech signal.

8 . The electronic device of claim 5 , wherein the at least one instruction, when executed by the at least one processor individually or collectively, further cause the electronic device to, based on the noise strength being greater than the first value, cancel noise included in the speech signal without eliminating the reverberation included in the speech signal.

9 . The electronic device of claim 5 , wherein the at least one instruction, when executed by the at least one processor individually or collectively, further cause the electronic device to determine an amount of the reverberation included in the speech signal to be eliminated, based on the noise strength.

10 . A method of operating an electronic device, the method comprising:

receiving, via a microphone of the electronic device, a speech signal including reverberation uttered by a user wearing the electronic device;

receiving, via a vibration sensor included in the electronic device, a vibration signal related to the speech signal, the vibration signal being sensed through at least a portion of a body of the user when the speech signal is uttered by the user;

identifying an impulse response signal based on the speech signal and the vibration signal;

predicting reverberation information based on the impulse response signal; and

eliminating the reverberation included in the speech signal based on the predicted reverberation information.

11 . The method of claim 10 , wherein the reverberation information includes at least one of a reverberation time of the impulse response signal or an early-to-late reverberation ratio between early reverberation and late reverberation included in the speech signal.

12 . The method of claim 11 , wherein the reverberation time is a time taken for the impulse response signal based on the speech signal and the vibration signal to be reduced by a specified strength.

13 . The method of claim 10 , wherein the eliminating the reverberation comprises:

identifying a strength of each of early reverberation and late reverberation included in the speech signal using the reverberation information; and

eliminating the reverberation included in the speech signal by subtracting the strength of the late reverberation from a strength of the speech signal.

14 . The method of claim 10 , wherein the eliminating the reverberation comprises:

identifying a noise strength of the speech signal; and

based on the noise strength being not greater than a first value, eliminating the reverberation included in the speech signal.

15 . The method of claim 14 , wherein the eliminating the reverberation further comprises:

identifying a strength of the reverberation included in the speech signal; and

based on the strength of the reverberation included in the speech signal being greater than a second value, eliminating the reverberation included in the speech signal.

16 . The method of claim 15 , further comprising, based on the strength of the reverberation included in the speech signal being not greater than the second value, canceling noise included in the speech signal without eliminating the reverberation included in the speech signal.

17 . The method of claim 14 , further comprising, based on the noise strength being greater than the first value, canceling noise included in the speech signal without eliminating the reverberation included in the speech signal.

18 . A non-transitory computer-readable recording medium storing one or more instructions which, when executed by a processor of an electronic device, cause the electronic device to execute a method comprising:

receiving, via a microphone of the electronic device, a speech signal including reverberation uttered by a user wearing the electronic device;

receiving, via a vibration sensor of the electronic device, a vibration signal related to the speech signal, the vibration signal being sensed through at least a portion of a body of the user;

identifying an impulse response signal based on the speech signal and the vibration signal;

predicting reverberation information based on the impulse response signal; and

eliminating the reverberation included in the speech signal based on the predicted reverberation information.