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In this paper a new LPC vocoder is presented which splits the LPC excitation into two frequency bands using a variable cutoff frequency .
 used for: variable cutoff frequency, LPC excitation; used for: variable cutoff frequency, frequency bands
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
 Entity Pairs:  variable cutoff frequency, LPC excitation; variable cutoff frequency, frequency bands 
Answer:
 used for: variable cutoff frequency, LPC excitation; used for: variable cutoff frequency, frequency bands