I want to know the physical significance of liftering process. with Ci as ith feature element in the feature vector, the liftering changes Ci as Ci = (1 + (N/2)sin((pi*n)/N))*Ci What is it actually doing to a signal? Mathematically it is amplifying the signal. But then, why do we need such an amplification in terms of number of frames? --------------------------------------- Posted through http://www.DSPRelated.com
Liftering, what is it actually?
Started by ●August 3, 2015
Reply by ●August 7, 20152015-08-07
On Monday, August 3, 2015 at 6:43:09 AM UTC-4, proffy wrote:> I want to know the physical significance of liftering process. > > with Ci as ith feature element in the feature vector, the liftering > changes Ci as > > Ci = (1 + (N/2)sin((pi*n)/N))*Ci > > What is it actually doing to a signal? > > Mathematically it is amplifying the signal. > > But then, why do we need such an amplification in terms of number of > frames? > > > --------------------------------------- > Posted through http://www.DSPRelated.comLiftering is filtering in the cepstral domain. Dirk