Pitch period is a key parameter in speech compression,synthesis and recognition.The well-known AMDF is often used to determine this parameter.But it is easy to make the estimated pitch doubled.With the problem,this paper analyses the features of the AMDF and its disavantages that occur in pitch detection.And a new function,Circular AMDF(CAMDF),is proposed.The CAMDF conquers the defect of the AMDF effectively,and simplifies the process of pitch detection.With the properties of CAMDF,a new pitch detection alg...
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