參數(shù)資料
型號(hào)： UPC1854AGT
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(guó)的多邊貿(mào)易體制處理LSI
文件頁(yè)數(shù)： 13/48頁(yè)
文件大小： 251K
代理商： UPC1854AGT
μ
PC1854A
13
Data Sheet S12816EJ3V0DS00
2. BLOCK FUNCTIONS
In the US, TV audio signals are broadcast in FM modulation. The stereo (L–R), Sub Audio Program (SAP) and
telemetry signals are multiplexed in a higher frequency band than the monaural (L+R) signal (50 Hz to 15 kHz).
The US MTS system base-band spectrum is described before:
Figure 2-1. US MTS System Base-Band Spectrum
Table 2-1. US MTS System Base-Band Spectrum
Signal frequency band
Signal processing system
Maximum audio
carrier deviation (kHz)
Monaural signal (L+R)
50 Hz to 15 kHz
25
Stereo pilot signal
15.734 kHz
Only stereo broadcasting
5
Stereo signal (L–R)
50 Hz to 15 kHz
AM modulation (carrier frequency 2 f
H
),
dbx noise reduction processing
50
Sub Audio Program (SAP)
signal
50 Hz to 10 kHz
FM modulation (carrier frequency 5 f
H
),
maximum frequency deviation 10 kHz)
dbx noise reduction processing
15
Telemetry signal
Audio
0 to 3.4 kHz
FM modulation (carrier frequency 6.5 f
H
maximum frequency deviation 3 kHz)
3
Data
0 to 1.5 kHz
f
H
(15.734 kHz)
2 f
H
3 f
H
4 f
H
5 f
H
6 f
H
6.5 f
H
Modulation frequency (Hz)
A
50
25
15
5
3
0
Stereo pilot
signal
Monaural
signal (L+R)
Stereo signal (L–R)
Sub Audio Program (SAP) signal
Telemetry
signal
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