
D-1
D-2
D-3
Even if playback errors are so severe that correction is
defeated, the error locations are known. Concealment
uses correct data to interpolate sample values that are
unavailable owing to uncorrectable errors. Conceal-
ment is ineffective for clustered error samples, so data is
ch~{'[I,~,,-I
I~fl^s~n ~llf~r ~ln~ inner rnFlin~ fn r~ll~P
"" ~'JJ "0
neighboring samples to be widely dispersed on tape.
Compressed DVTRs can afford a much higher budget of
bits allocated to forward error correction. However, in
the face of uncorrectable errors, entire blocks or macro-
blocks are lost, ...