Adaptive predictive coding (APC) is a
narrowband
Narrowband signals are signals that occupy a narrow range of frequencies or that have a small fractional bandwidth. In the audio spectrum, narrowband sounds are sounds that occupy a narrow range of frequencies. In telephony, narrowband is usua ...
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.
APC is related to
linear predictive coding
Linear predictive coding (LPC) is a method used mostly in audio signal processing and speech processing for representing the spectral envelope of a digital signal of speech in compressed form, using the information of a linear predictive mod ...
(LPC) in that both use adaptive predictors. However, APC uses fewer prediction coefficients, thus requiring a higher
sampling rate
In signal processing, sampling is the reduction of a continuous-time signal
In mathematical dynamics, discrete time and continuous time are two alternative frameworks within which variables that evolve over time are modeled.
Discrete time
...
than LPC.
References
Digital signal processing
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