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参数资料
| 型号： | C1851BCU |
| 厂商： | NEC Corp. |
| 英文描述： | I2C BUS-COMPATIBLE US MTS PROCESSING LSI |
| 中文描述： | I2C总线兼容美国的多边贸易体制处理LSI |
| 文件页数： | 13/60页 |
| 文件大小： | 447K |
| 代理商： | C1851BCU |
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20
PC1851B
Data Sheet S13417EJ2V0DS00
2.3 dbx Noise Reduction Block
All the filters required for TV-dbx Noise Reduction are incorporated. These filter responses are adjusted by
setting all the FILTER SETTING bits (Write register, subaddress 02H, bits D0 to D5).
(1) LPF
This LPF has traps at fH and 24 kHz each. The fH trap filter minimizes interference by the fH signal which is not
synchronized with the pilot signal (for example, leakage of the synchronous idle and buzz from the video signal).
(2) 408-Hz LPF
This filter is a de-emphasis filter. Its transfer function is as follows:
f
1 + j
5.23k
T(f) =
f
1 + j
408
(3) Variable Emphasis
It is also called the spectral VCA. It is controlled by the spectral RMS. The transfer function is as follows:
f
1 + 51b
1 + j
x
20.1k
b + 1
S–1 (f, b) =
f
1 + 51
1 + j
x
20.1k
b + 1
where “b” is the variable transferred from the spectral RMS for controlling.
(4) Wide-band VCA
A VCA whose operating frequency range is mainly low to mid frequencies and controlled by the wide-band RMS.
The transfer function is as follows:
W–1 (a) = a
where “a” is the variable transferred from the wide-band RMS for controlling.
(5) 2.19-kHz LPF
This filter is a de-emphasis filter. Its transfer function is as follows:
f
1 + j
62.5k
T(f) =
f
1 + j
2.19k
(6) Spectral RMS Filter
A filter that limits the band width of the signal input to the RMS which controls the variable emphasis. The
transfer function is as follows:
ff
( j
)
2
j
7.66k
3.92k
T (f) =
x
ff
f
1 + j
+ ( j
)
2
1 + j
7.31k
7.66k
3.92k
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