參數(shù)資料
型號(hào)： UPC1876
廠商： NEC Corp.
英文描述： US MTS DECODER
中文描述： 美國(guó)的多邊貿(mào)易體制解碼器
文件頁(yè)數(shù)： 15/40頁(yè)
文件大小： 309K
代理商： UPC1876
μ
PC1876
15
Data Sheet S11666EJ4V0DS00
2.2 SAP Demodulation Block
(1) SAP BPF
Picks up the SAP signal by the 50 kHz and 102 kHz traps, and response peak at 5 f
H
.
Adjust the current value output from the FLTA pin for the filter response.
(2) Noise BPF
The
μ
PC1876 monitors signals picked up by noise BPF (f
O
180 kHz), and distinguish noises from signals. By
this method, the
μ
PC1876 prevents misoperating on SAP detection in a weak electric field.
Adjust the current value output from the FLTA pin for the filter response.
(3) Noise detector
Performs full-wave rectification of noise which has passed through noise BPF to change it to the DC voltage and
input it to comparator. When the noise level exceeds the reference level, the stereo LED and SAP LED are turned
off, and the stereo and SAP demodulation are stopped.
Adjust the value of the resistor and capacitor connected to the NDT pin for the sensitivity and time constant of
the noise detection circuit.
(4) SAP detector
Performs synchronized detection of the SAP signal which has passed through the SAP BPF, and smoothes it
with the SDT pin and input it to the comparator. When receiving the SAP signal, the SAP LED is turned on.
(5) SAP demodulator
The SAP demodulator consists of the phase detector, loop filter, and SAP VCO (PLL detection circuit).
The SAP VCO oscillates at 10 f
H
, and performs phase comparison between the signal divided by 2 of the SAP
VCO frequency and the SAP signal to make the PLL loop. Adjust the current value output from the SAPVA pin
for the frequency of the SAP VCO.
(6) SAP LPF
Eliminates the SAP carrier and higher frequency buzz. The filter consists of a secondary LPF and f
H
trap filter.
Adjust the current value output from the FLTA pin for the filter response.
2.3 dbx Noise Reduction Block
All the filters required for the TV-dbx noise reduction are incorporated. Adjust the current value output from the
FLTA pin for these filter responses.
(1) LPF
The LPF has traps at f
H
and 24 kHz each. The f
H
trap filter minimizes interference to the dbx noise reduction
by the f
H
signal which is not synchronized with the pilot signal (e.g. leakage of the synchronous idle and buzz
from the video signal).
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