Apparatus and method for eliminating noise, sound recognition apparatus using the apparatus and vehicle equipped with the sound recognition apparatus

An apparatus for eliminating noise, comprising:

• a frequency band division unit that divides an input signal into a signal having a high frequency component and a signal having a low frequency component;
• a high frequency noise processing unit that eliminates noise of the signal having the high frequency component based on a low resolution analysis algorithm;
• a low frequency noise processing unit that eliminates noise of the signal having the low frequency component based on a high resolution analysis algorithm;
• and
• a synthesis unit that synthesizes a signal processed by the high frequency noise processing unit with a signal processed by the low frequency noise processing unit.

A sound recognition apparatus comprising:

• an input unit that receives a sound signal in which an original signal and noise are mixed;
• a conversion unit that converts the sound signal into a signal in a frequency-domain;
• a gain acquisition unit that determines a gain and a correction value of the gain using a signal to noise ratio (SNR) of the sound signal and acquires a corrected gain obtained by applying the determined correction value to the determined gain;
• a gain application unit that acquires an output signal by applying the corrected gain to the sound signal, wherein a proportion of the input signal of which noise is eliminated in the output signal and a proportion of the input signal of which noise is not eliminated in the output signal are changed according to the determined correction value;
• and
• an inverter that inverts the output signal.

A sound recognition apparatus comprising:

• an input unit that receives a sound signal in which an original signal and noise are mixed;
• a frequency band division unit that divides an input signal into a signal having a high frequency component and a signal having a low frequency component;
• a high frequency noise processing unit that eliminates noise of the signal having the high frequency component based on a low resolution analysis algorithm;
• a low frequency noise processing unit that eliminates noise of the signal having the low frequency component based on a high resolution analysis algorithm;
• and
• a synthesis unit that synthesizes a signal processed by the high frequency noise processing unit with a signal processed by the low frequency noise processing unit.

A vehicle comprising:

• an input unit that receives a sound signal from a passenger of the vehicle in which sound instructions and noise are mixed together;
• a sound recognition unit that recognizes sound instructions by:
• i) converting the received sound signal into a signal in a frequency-domain, ii) determining a gain and a correction value of the gain using a signal to noise ratio (SNR) of the signal in the frequency-domain, iii) acquiring an output signal by applying a corrected gain obtained by applying the determined correction value to the determined gain, and iv) inverting the output signal, wherein a proportion of the received sound signal of which noise is eliminated in the output signal and a proportion of the received sound signal of which noise is not eliminated in the output signal are changed based on the determined correction value;
• and
• a controller that generates a control signal based on the recognized sound instructions.

A vehicle comprising:

• an input unit that receives a sound signal from a passenger of the vehicle in which sound instructions and noise are mixed together;
• a frequency band division unit that divides the received sound signal into a signal having a high frequency component and a signal having a low frequency component;
• a sound recognition unit that:
• i) eliminates noise of the signal having the high frequency component based on a low resolution analysis algorithm, ii) eliminates noise of the signal having the low frequency component based on a high resolution analysis algorithm, iii) synthesizes the signal having the high frequency component of which noise is eliminated with the signal having the low frequency component of which noise is eliminated, and iv) recognizes sound instructions based on the synthesized signal;
• and
• a controller that generates a control signal based on the recognized sound instructions.

A method of eliminating noise, comprising:

• determining a gain and a correction value of the gain using a signal to noise ratio (SNR) of an input signal;
• acquiring a corrected gain obtained by applying the determined correction value to the determined gain;
• and
• acquiring an output signal by applying the corrected gain to the input signal, wherein a proportion of an input signal of which noise is eliminated in the output signal and a proportion of the input signal of which noise is not eliminated in the output signal are changed based on the determined correction value.

A method of eliminating noise, comprising:

• dividing an input signal into a signal having a high frequency component and a signal having a low frequency component;
• eliminating noise of the signal having the high frequency component based on a low resolution analysis algorithm;
• eliminating noise of the signal having the low frequency component based on a high resolution analysis algorithm;
• and
• synthesizing the signal having the high frequency component of which noise is eliminated with the signal having the low frequency component of which noise is eliminated.