MSP34X0G Datasheet, PDF (74/96 Pages) Micronas – Multistandard Sound Processor Family

MSP 34x0G
PRELIMINARY DATA SHEET
5. Appendix A: Overview of TV-Sound Standards
5.1. NICAM 728
Table 5–1: Summary of NICAM 728 sound modulation parameters
Specification
Carrier frequency of
digital sound
Transmission rate
Type of modulation
Spectrum shaping
Roll-off factor
Carrier frequency of
analog sound component
Power ratio between
vision carrier and
analog sound carrier
Power ratio between
analog and modulated
digital sound carrier
I
6.552 MHz
B/G
5.85 MHz
L
5.85 MHz
D/K
5.85 MHz
1.0
6.0 MHz
FM mono
10 dB
728 kbit/s
Differentially encoded quadrature phase shift keying (DQPSK)
by means of Roll-off filters
0.4
0.4
0.4
5.5 MHz
FM mono
6.5 MHz AM mono
terrestrial cable
6.5 MHz
FM mono
13 dB
10 dB
16 dB
13 dB
10 dB
7 dB
17 dB
11 dB
China/Hu
ngary
12 dB
Poland
7 dB
Table 5–2: Summary of NICAM 728 sound coding characteristics
Characteristics
Audio sampling frequency
Number of channels
Initial resolution
Companding characteristics
Coding for compressed samples
Preemphasis
Audio overload level
Values
32 kHz
2
14 bit/sample
near instantaneous, with compression to 10 bits/sample in 32-samples (1 ms) blocks
2’s complement
CCITT Recommendation J.17 (6.5 dB attenuation at 800 Hz)
+12 dBm measured at the unity gain frequency of the preemphasis network (2 kHz)
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