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LPC based speech coders operating at bit rates below 3.0 kbits/sec are usually associated with buzzy or metallic artefacts in the synthetic speech .
 bit rates, LPC based speech coders; buzzy or metallic artefacts, synthetic speech
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 bit rates, LPC based speech coders; buzzy or metallic artefacts, synthetic speech