saa7327 NXP Semiconductors, saa7327 Datasheet - Page 15

• Manufacturer Part Number: saa7327
• Description: Digital Servo Processor And Compact Disc Decoder With Integrated Dac For Video Cd Cd7 Ii
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 2 Output flags
7.7
7.7.1
When pre-emphasis is detected in the Q-channel
subcode, the digital filter automatically includes a
de-emphasis filter section. When de-emphasis is not
required, a phase compensation filter section controls the
phase of the digital oversampling filter to
band 0 to 16 kHz. With de-emphasis the filter is not phase
linear.
If the de-emphasis signal is set to be available at V5,
selected via decoder register D, then the de-emphasis
filter is bypassed.
7.7.2
For optimizing performance with an external DAC, the
SAA7327 contains a 2 to 4 times oversampling IIR filter.
The filter specification of the 4 times oversampling filter is
given in Table 3.
These attenuations do not include the sample-and-hold at
the external DAC output or the DAC post filter. When using
the oversampling filter, the output level is scaled 0.5 dB
down, to avoid overflow on full-scale sine wave inputs
(0 to 20 kHz).
2000 Jun 26
Digital servo processor and Compact Disc
decoder with integrated DAC for video CD (CD7 II)
F1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
1
Audio functions
D
D
F2
E
IGITAL OVERSAMPLING FILTER
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
-
EMPHASIS AND PHASE LINEARITY
F3
X
X
X
X
X
X
X
X
X
X
X
X
0
1
0
1
F4
X
X
X
X
X
X
X
X
X
X
0
0
0
0
1
1
F5
X
X
X
X
X
X
X
X
X
X
0
0
1
1
0
1
F6
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
1 within the
F7
X
X
X
X
X
X
X
X
X
X
X
X
0
1
0
1
15
F8
X
X
X
X
X
X
X
X
X
X
0
1
0
1
0
1
Table 3 Filter specification
7.7.3
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.11).
In CD-ROM modes (i.e. the external DAC interface is
selected to be in a CD-ROM format) concealment is not
executed.
PASS BAND
19 to 20 kHz
no absolute time sync
absolute time sync
C1 frame contained no errors
C1 frame contained 1 error
C1 frame contained 2 errors
C1 frame uncorrectable
C2 frame contained no errors
C2 frame contained 1 error
C2 frame contained 2 errors
C2 frame contained 3 errors
C2 frame contained 4 errors
C2 frame uncorrectable
no interpolations
at least one 1-sample interpolation
at least one hold and no interpolations
at least one hold and one 1-sample interpolation
0 to 9 kHz
C
ONCEALMENT
STOP BAND
24 to 27 kHz
27 to 35 kHz
35 to 64 kHz
64 to 68 kHz
69 to 88 kHz
DESCRIPTION
24 kHz
68 kHz
Product specification
ATTENUATION
SAA7327
0.001 dB
0.03 dB
25 dB
38 dB
40 dB
50 dB
31 dB
35 dB
40 dB