參數(shù)資料
型號(hào)： UPC1876GT
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)： 13/40頁(yè)
文件大?。?/td> 309K
代理商： UPC1876GT
μ
PC1876
13
Data Sheet S11666EJ4V0DS00
2. FUNCTION OF EACH BLOCK
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
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
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
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