Adaptive predictive coding

Adaptive predictive coding (APC) is a narrowband analog-to-digital conversion that uses a one-level or multilevel sampling system in which the value of the signal at each sampling instant is predicted according to a linear function of the past values of the quantized signals.{{cite book|last1=Keiser|first1=Bernard E.|last2=Strange|first2=Eugene|title=Digital Telephony and Network Integration|date=2012|publisher=Springer Science & Business Media|isbn=9781461517870|page=94|url=https://books.google.com/books?id=4E3TBwAAQBAJ&dq=adaptive+predictive+coding+ADC&pg=PA94|access-date=5 April 2018|language=en}}

APC is related to linear predictive coding (LPC) in that both use adaptive predictors. However, APC uses fewer prediction coefficients, thus requiring a higher sampling rate than LPC.