Motorola DSP56156 Manual page 182

Start long
interrupt
routine
save context
DECIMATION
read input sample
from A/D COMB
Bandpass and Com-
pensation Filter
Y
8KHz?
store sample
N
in the speech
End of
DECIMATION
Figure 6-39 Flowchart of a Decimation/Interpolation Routine
MOTOROLA
DSP PROGRAM FLOWCHART
frame
DSP56156 ON-CHIP SIGMA/DELTA CODEC
INTERPOLATION
N
8KHz?
input 0
Bandpass and Com-
pensation Filter
write output sample
to D/A COMB
End of
INTERPOLATION
restore context
End of long
interrupt
routine
Y
read sample
in the speech
frame
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