Reduction of Clicking Sounds in Audio Data Stream

An apparatus for reducing clicks in an audio data stream, comprising:

• a delay unit for storing a delayed sequence of samples in a sliding window;
• a click detector for detecting clicks in said stored sequence of samples 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;
• a unit for producing a substitute data to replace samples within said audio data stream for the duration of a click;
• and
• a multiplexor for substituting said substitute signal in said delayed audio data stream during the duration of a click, and
• wherein said click detector further comprises:
• a memory for storing a sequence of samples on a sliding window basis;
• a filter for filtering said samples to produce the filtered value;
• a comparator for comparing the current maximum value of said stored sequence of samples with said filtered value subject to a scaling factor so as to produce a negative click indication when the current maximum stored value is less than the filtered value subject to a scaling factor and a positive click indication when the current maximum stored value is greater than the filtered value subject to a scaling factor and a stored peak value subject to a scaling factor;
• a counter that 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 that gives a click start indication in response to an increment edge and a click end indication in response to a decrement of the counter.