Philips SAA7345 - Manual (Page 15)

1998 Feb 16 15
Philips Semiconductors Product specification
CMOS digital decoding IC with RAM for
Compact Disc
SAA7345
Table 3 Digital filter passband characteristics
Table 4 Digital filter stopband characteristics.
C ONCEALMENT
A 1-sample linear interpolator becomes active if a single sample is flagged as erroneous but cannot be corrected. The
erroneous sample is replaced by a level midway between the preceding and following samples. Left and right channels
have independent interpolators.
If more than one consecutive non-correctable sample is found, the last good sample is held. A 1-sample linear
interpolation is then performed before the next good sample (see Fig.13).
PASSBAND ATTENUATION
0 to 19 kHz
≤
0.001 dB
19 to 20 kHz
≤
0.03 dB
STOPBAND ATTENUATION
24 kHz
≥
25 dB
24 to 27 kHz
≥
38 dB
27 to 35 kHz
≥
40 dB
35 to 64 kHz
≥
50 dB
64 to 68 kHz
≥
31 dB
68 kHz
≥
35 dB
69 to 88 kHz
≥
40 dB
Fig.12 Digital filter characteristics.
40
20
0
40
60
0 10 30
MGA385
20
20 50
magnitude
(dB)
frequency (kHz)