SCENE 

 A 



SCENE 

 B 



PREVIOUS 

 VALUE 

 17 DB 



PREVIOUS 

 VALUE 

 22 DB 



, 4 



SCENE ^ 



C i 







PREVIOUS 

 VALUE 

 10.5 DB 



Fig. 15 — Three pictures showing the appearance of tlie error signal when using 

 "previous value" prediction. Note the absence of horizontal contours. 



779 



