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參數(shù)資料
| 型號： | MSP3445G |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | MSP 34x5G Multistandard Sound Processor Family |
| 中文描述： | 中型34x5G多標準聲音處理器系列 |
| 文件頁數(shù)： | 73/98頁 |
| 文件大?。?/td> | 1541K |
| 代理商： | MSP3445G |
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PRELIMINARY DATA SHEET
MSP 34x5G
Micronas
73
5. Appendix A: Overview of TV Sound Standards
5.1. NICAM 728
Table 5
–
1:
Summary of NICAM 728 sound modulation parameters
Specification
I
B/G
L
D/K
Carrier frequency of
digital sound
6.552 MHz
5.85 MHz
5.85 MHz
5.85 MHz
Transmission rate
728 kbit/s
Type of modulation
Differentially encoded quadrature phase shift keying (DQPSK)
Spectrum shaping
Roll-off factor
by means of Roll-off filters
1.0
0.4
0.4
0.4
Carrier frequency of
analog sound component
6.0 MHz
FM mono
5.5 MHz
FM mono
6.5 MHz AM mono
6.5 MHz
FM mono
terrestrial
cable
Power ratio between
vision carrier and
analog sound carrier
10 dB
13 dB
10 dB
16 dB
13 dB
Power ratio between
analog and modulated
digital sound carrier
10 dB
7 dB
17 dB
11 dB
China/
Hungary
Poland
12 dB
7 dB
Table 5
–
2:
Summary of NICAM 728 sound coding characteristics
Characteristics
Values
Audio sampling frequency
32 kHz
Number of channels
2
Initial resolution
14 bit/sample
Companding characteristics
near instantaneous, with compression to 10 bits/sample in 32-samples (1 ms) blocks
Coding for compressed samples
2
’
s complement
Preemphasis
CCITT Recommendation J.17 (6.5 dB attenuation at 800 Hz)
Audio overload level
+12 dBm measured at the unity gain frequency of the preemphasis network (2 kHz)
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