Is this the same question as http://www.mathworks.co.uk/matlabcentral/answers/65886-can-anybody-help-me-to-supress-the-high-ampplitude-part-of-the-signal-completely-i-have-given-the-l ?
And in turn is that actually the same question as http://www.mathworks.co.uk/matlabcentral/answers/65828-supress-high-amplitude-signal-and-only-keep-low-amplitude which is waiting for your reply?
