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參數(shù)資料
| 型號： | UPC1854A |
| 廠商： | NEC Corp. |
| 英文描述： | I2C BUS-COMPATIBLE US MTS PROCESSING LSI |
| 中文描述： | I2C總線兼容美國的多邊貿(mào)易體制處理LSI |
| 文件頁數(shù)： | 17/48頁 |
| 文件大?。?/td> | 251K |
| 代理商： | UPC1854A |
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μ
PC1854A
17
Data Sheet S12816EJ3V0DS00
(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:
( j
f
)
2
j
f
T (f) =
7.66k
×
3.92k
1 + j
f
+ ( j
f
)
2
1 + j
f
7.31k
7.66k
3.92k
(7) Wide-band RMS filter
A filter that limits the band width of the signal input to the wide-band RMS which controls the wide-band VCA.
The transfer function is as follows:
T(f) =
1
1 + j
f
2.09k
(8) Spectral RMS
Detects the RMS value of the signal passed through the spectral RMS filter, and converts the signal to the DC
voltage. The release time is set by adjusting the current I
T
of the
μ
PC1854A and the capacitance of the
external capacitor connected to the STI pin. The current I
T
is set by the current value output from the ITI pin.
(9) Wide-band RMS
Detects the RMS value of the signal passed through the wide-band RMS filter, and converts the signal to the
DC voltage. The release time is set by adjusting the current I
T
of the
μ
PC1854A and the capacitance of the
external capacitor connected to the WTI pin. The current I
T
is set by the current value output from the ITI pin.
2.4 Matrix Block
(1) Matrix
Adds L+R signal and L–R signal to output L signal, and subtracts L+R signal from L–R signal to output R
signal.
(2) Mode selector
Selects the user-selected mode among the monaural, stereo, SAP, external SAP input signals, and mute, then
outputs it from the NOT, ROT and LOT pins.
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