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MSP3410B Datasheet(PDF) 6 Page - Micronas |
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MSP3410B Datasheet(HTML) 6 Page - Micronas |
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6 / 68 page  PRELIMINARY DATA SHEET MSP 3410 B 6 ITT Semiconductors 3. Application Fields of the MSP 3410 B In the following sections, a brief overview about the two main TV sound standards, NICAM 728 and German FM- Stereo, demonstrates the complex requirements of a multistandard audio IC. 3.1. NICAM plus FM-Mono According to the British, Scandinavian and Spanish TV- standards, high quality stereo sound is transmitted digi- tally. The systems allow two high quality digital sound channels to be added to the already existing FM chan- nel. The sound coding follows the format of the so-called Near Instantaneous Companding System (NICAM 728). Transmission is performed using Differential Quadra- ture Phase Shift Keying (DQPSK). Table 3–2 gives some specifications of the sound coding (NICAM); Table 3–3 offers an overview of the modulation parameters. In the case of NICAM/FM mode there are three different audio channels available: NICAM A,NICAM B and FM- mono. NICAM A and B may belong either to a stereo or to a dual language transmission. Information about op- eration mode and about the quality of the NICAM signal can be read by the CCU via the control bus. In the case of low quality (high bit error rate) the CCU may decide to switch to the analog FM-mono sound. 3.2. German 2-Carrier System (DUAL FM System) Since September 1981, stereo and dual sound pro- grams have been transmitted in Germany using the 2-carrier system. Sound transmission consists of the al- ready existing first sound carrier and a second sound carrier additionally containing an identification signal. Some more details of this standard are given in Table 3–4. Table 3–1: European TV standards TV-System Position of Sound Carrier /MHz Sound Modulation Color System Country B/G 5.5/5.74 FM-Stereo PAL Germany B/G 5.5/5.85 FM-Mono/NICAM PAL Scandinavia,Spain L 6.5/5.85 AM-Mono/NICAM SECAM France I 6.0/6.552 FM-Mono/NICAM PAL UK D,K 6.5 FM-Mono SECAM USSR M 4.5 FM-Mono NTSC USA Satellite Satellite 6.5 7.02/7.2 FM-Mono FM-Stereo PAL PAL Europe (ASTRA) Europe (ASTRA) Table 3–2: 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-sam- ples (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 dBm0 measured at the unity gain frequency of the preemphasis network (2 kHz) |
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