Method for detecting ambient noise to change the playing voice frequency and sound playing device thereof

1. A method for detecting ambient noise to change the playing voice frequency, used for a sound playing device, the method comprising the following steps:

obtaining an input voice;

detecting an ambient noise, and analyzing a noise frequency range of the ambient noise, wherein the noise frequency range comprises a high noise frequency range, a low noise frequency range, and an intermediate noise frequency range;

determining whether a consonant frequency range of the input voice falls within the noise frequency range within at least one of the high noise frequency range, the low noise frequency range, and the intermediate noise frequency range;

if yes, adjusting the consonant frequency range of the input voice toward a frequency region where the change is small to avoid the noise frequency range to form a modified voice, such that a frequency difference between the modified voice and the input voice is minimized; wherein when the consonant frequency range falls within the high noise frequency range, the consonant frequency range is shifted to form a low frequency modified voice or an intermediate frequency modified voice; when the consonant frequency range falls within the low noise frequency range, the consonant frequency range is shifted to form a high frequency modified voice or the intermediate frequency modified voice; when the consonant frequency range falls within the intermediate noise frequency range, the consonant frequency range is shifted to form the high frequency modified voice or the low frequency modified voice; and

playing an output voice, wherein the output voice includes the modified voice.

2. The method for detecting ambient noise to change the playing voice frequency as claimed claim 1 , wherein the output voice further includes the input voice.

3. The method for detecting ambient noise to change the playing voice frequency as claimed claim 1 , wherein the modified voice is no more than 12000 Hz and no less than 3000 Hz.

4. The method for detecting ambient noise to change the playing voice frequency as claimed in claim 1 , wherein a vowel frequency of the input voice is not adjusted.

5. A sound playing device, comprising:

a voice acquisition module, which is used for obtaining an input voice;

a noise detector, which is electrically connected to the voice acquisition module for detecting an ambient noise;

a noise analysis module, which is electrically connected to the noise detector for analyzing a noise frequency range of the ambient noise, wherein the noise frequency range comprises a high noise frequency range, a low noise frequency range, and an intermediate noise frequency range;

a voice processing module, which is electrically connected to the noise analysis module for determining whether a consonant frequency range of the input voice falls within the noise frequency range within at least one of the high noise frequency range, the low noise frequency range, and the intermediate noise frequency range; if yes, adjusting the consonant frequency range of the input voice toward a frequency region where the change is small to avoid the noise frequency range to form a modified voice, such that a frequency difference between the modified voice and the input voice is minimized; wherein when the consonant frequency range falls within the high noise frequency range, the consonant frequency range is shifted to form a low frequency modified voice or an intermediate frequency modified voice by the voice processing module; when the consonant frequency range falls within the low noise frequency range, the consonant frequency range is shifted to form a high frequency modified voice or the intermediate frequency modified voice by the voice processing module; when the consonant frequency range falls within the intermediate noise frequency range, the consonant frequency range is shifted to form the high frequency modified voice or the low frequency modified voice by the voice processing module; and

a speaker module, which is electrically connected to the voice processing module for playing an output voice, wherein the output voice includes the modified voice.

6. The sound playing device as claimed claim 5 , wherein the output voice further includes the input voice.

7. The sound playing device as claimed claim 5 , wherein the modified voice is adjusted to be no more than 12000 Hz and no less than 3000 Hz.

8. The sound playing device as claimed in claim 5 , wherein the voice processing module does not adjust a vowel frequency of the input voice.