Philips SAA7345 User Manual

Page 15

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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)

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