
1.2 Example Applications 15
error signal is also transmitted to correct for small imperfections in the signal.
The inverse DCT and picture/store predictor in the feedback are used to generate
the uncompressed version of the lossily compressed signal that would be seen
by the receiver; that reconstruction is used to generate the error signal.
audio
compression
Digital audio compression also uses combinations of lossy and lossless cod-
ing. However, the auditory centers of the brain are somewhat better understood
than the visual center, allowing for more sophisticated perceptual encoding
approaches.
Many audio-encoding standards have been developed. The ...