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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： | 14/60页 |
| 文件大小： | 447K |
| 代理商： | C1851BCU |
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21
PC1851B
Data Sheet S13417EJ2V0DS00
(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:
1
T(f) =
f
1 + j
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 IT of the
PC1851B and the capacitance of the external
capacitor connected to the STI pin. The current IT is adjusted by adjusting the current 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 IT of the
PC1851B and the capacitance of the external
capacitor connected to the WTI pin. The current IT is adjusted by adjusting the current from the ITI pin.
2.4 Matrix Block
(1) Matrix
Adds L+R signal and L–R signal to output L signal, and substracts L+R signal from L–R signal to output R signal.
(2) Mode Selector
The matrix block selects the signal from the monaural signal, Stereo signal, SAP signal by the User Mode.
2.5 Selector Block
It selects the signal from the TV signal (signal with the audio multiple signal processed in the
PC1851B) and
external input (signal input from EL1, EL2, ER1 and ER2 pins), and outputs it to the surround processor block
(surround, tone control, and volume control block).
It also selects the gain of the selection signal (0 dB/6 dB) as well as switches the stereo/monaural output (by the
I2C bus).
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