Patent ID: 8311229
Filing Date: 2012-11-13
Classification: G11B,H03G

Abstract:
1. A method of reducing clicking sounds in an audio data stream, comprising: delaying samples of the audio data by a predetermined amount in a sliding window containing a predetermined number of samples; detecting the presence of a clicking sound in the delayed data within said sliding window by comparing the maximum value of a current set of samples within the sliding window with a filtered value derived from the samples subject to a scaling factor; replacing the audio data in the delayed data corresponding to the clicking sounds by substitute data; wherein when said maximum value is smaller than the filtered value, subject to said scaling factor, a negative click indication is produced and a stored peak value is reduced by a factor beta until it reaches zero, and when said maximum value is greater than both the filtered value and the stored peak value, subject to suitable scaling factors, a positive click indication is produced and the stored peak value is set at the greater of the current maximum value and the current stored peak value; and wherein a counter increments in response to a positive click indication and decrements in response to a negative click indication, and an edge detector responsive to rising and falling edges gives a click start indication in response to an increment and a click end indication in response to a decrement of the counter.