Method of eliminating background noise and a device using the same

A device of eliminating background noise, comprising:

• a detecting unit, which is configured to detect an effective value of a received audio signal, and generate an average power signal of the received audio signal, wherein the receive audio signal includes noise and a voice signal;
• a first signal generating unit, which is configured to generate a noise eliminating control signal by comparing the average power signal from the detecting unit with a first threshold, the first signal generating unit including a first comparison module, a second comparison module, a compensation module and a second logic processing module, wherein:
• the first comparison module is configured to extract a first control signal for an effective voice signal by comparing the average power signal from the detecting unit with a second threshold;
• the compensation module is configured to generate a second control signal by compensating the first control signal from the first comparison module;
• the second comparison module is configured to extract a third control signal for an excessive audio signal by comparing the average power signal from the detecting unit with a third threshold;
• and
• the second logic processing module is configured to process the second control signal from the compensation module and the third control signal from the second comparison module using exclusive logic OR, and generating the noise eliminating control signal;
• and
• an amplifying unit, which is configured to eliminate the noise in the received audio signal, and amplify the voice signal in the received audio signal in accordance with the noise eliminating control signal from the second logic processing module;
• wherein the first threshold depends, at least in part, on the difference between an average power of the voice signal and an average power of the noise.