MSP4458 datasheet(69/85 Pages) MICRONAS

69 / 85 page

PRELIMINARY DATA SHEET

MSP 44x8G

Micronas

5. Appendix A: Overview of TV-Sound Standards

5.1. NICAM 728

Table 5–1: Summary of NICAM 728 sound modulation parameters

Specification

B/G

D/K

Carrier frequency of

digital sound

6.552 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

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

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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