PERSONAL NOISE REDUCTION METHOD FOR ENCLOSED CABINS
A Personal Noise Reduction for enclosed cabins is disclosed. According to one embodiment, an input audio source corresponding to sound received from multiple microphones situated equidistantly in both directions in a two dimensional plane, is converted to a digital signal via an analog to digital (A/D) convertor. The AID converted audio is analyzed for content to identify ambient noise. The frequency, amplitude and phase of the identified ambient noise is subsequently determined. A Noise correction sound wave is generated with negative phase of that corresponding to the identified ambient noise. The noise correction sound wave is added to the identified noise to create a noise corrected sound.
1 . A Personal Noise Reduction method comprising:
Providing an input audio source;
Converting the input audio source to a digital signal via an analog to digital (A/D) convertor;
Analyzing the A/D converted audio for content and identifying ambient noise;
Determining frequency, amplitude and phase of the identified ambient noise;
Generating a noise correction sound wave with the same frequency and amplitude but negative phase of that corresponding to the identified ambient noise;
Outputting the noise correction sound wave.
2 . The Personal Noise Reduction of claim 1 wherein the negative phase is a phase shifted wave with a shift of 180 degrees from the phase of the identified ambient noise.
3 . The Personal Noise Reduction of claim 1 further comprising monitoring the A/D converted audio for changes in the identified ambient noise and identifying any additions or changes to the identified ambient noise.
4 . The Personal Noise Reduction of claim 1 , wherein the input audio source is received from multiple microphones situated in the enclosed cabin.
5 . The Personal Noise Reduction of claim 4 , wherein the microphones are of Cardiod type.
6 . The Personal Noise Reduction of claim 4 , wherein the enclosed cabin is a hotel room.