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參數(shù)資料
| 型號： | SAA7373GP |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Digital servo processor and Compact Disc decoder CD7 |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 文件頁數(shù)： | 15/60頁 |
| 文件大小： | 323K |
| 代理商： | SAA7373GP |
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1998 Jul 06
15
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder (CD7)
SAA7373
7.7.3
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.10).
In CD ROM modes (i.e. the DAC interface is selected to be
in a CD ROM format) concealment is not executed.
7.7.4
M
UTE
,
FULL SCALE
,
ATTENUATION AND FADE
A digital level controller is present on the SAA7373 which
performs the functions of soft mute, full scale, attenuation
and fade; these are selected via register 0:
Mute: signal reduced to 0 in a maximum of 128 steps;
(3/n) ms.
Attenuate: signal scaled by
12 dB.
Full scale: ramp signal back to 0 dB level. From mute
takes (3/n) ms.
Fade: activates a 128 stage counter which allows the
signal to be scaled up/down by 0.07 dB steps
128 = full scale.
120 =
0.5 dB (i.e. full scale if oversampling filter
used).
32 =
12 dB.
0 = mute.
7.7.5
P
EAK DETECTOR
The peak detector measures the highest audio level
(absolute value) on positive peaks for left and right
channels. The 8 most significant bits are output in the
Q-channel data in place of the CRC bits. Bits 81 to 88
contain the left peak value (bit 88 = MSB) and
bits 89 to 96 contain the right peak value (bit 96 = MSB).
The values are reset after reading Q-channel data via
SDA.
Fig.10 Concealment mechanism.
Interpolation
Hold
Interpolation
MGA372
OK
Error
OK
Error
Error
Error
OK
OK
相關PDF資料 |
PDF描述 |
|---|---|
| SAA7374 | Low voltage digital servo processor and Compact Disc decoder CD7LV |
| SAA7374GP | Low voltage digital servo processor and Compact Disc decoder CD7LV |
| SAA7376 | Digital servo processor and Compact Disc decoder CD7 |
| SAA7377GP | Force/Pressure transducer; Compensated; Pressure Range: 0 to 25 psi |
| SAA7377 | Digital servo processor and Compact Disc decoder CD7 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7374 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low voltage digital servo processor and Compact Disc decoder CD7LV |
| SAA7374GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low voltage digital servo processor and Compact Disc decoder CD7LV |
| SAA7376 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7 |
| SAA7377 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7 |
| SAA7377GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7 |
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