Patent ID: 6668062
Filing Date: 2003-12-23
Classification: H04R

Abstract:
An apparatus comprising:a first microphone; a second microphone; at least one analog-to-digital converter adapted to convert first and second analog microphone outputs into first and second digital time-domain data; and processing means receiving the digital time domain data, the processing means including, a first Discrete Fourier Transform block converting the first digital time-domain data into a first digital frequency-domain data, a second-Discrete Fourier Transform block converting the second digital time-domain data into a second digital frequency-domain data, a noise canceling processing block operating on the first and second digital frequency-domain data to produce noise-canceled digital frequency-domain data, the noise-canceled digital frequency-domain data being a function of the first and second digital frequency-domain data that effectively cancels noise when the noise is greater than a target signal and the noise and the target signal are not in the same direction from the apparatus, the function providing adaptive directionality to cancel the noise, and an Inverse Discrete Fourier Transform block converting the noise-canceled digital frequency-domain data into noise-canceled digital time-domain data, wherein if X(&ohgr;) represents one of the first and second digital frequency-domain data and Y(&ohgr;) represents the other of the first and second digital frequency-domain data, and the function is proportional to X(&ohgr;)[1âˆ’|Y(&ohgr;)|/|X(&ohgr;)|].