MSP3405D Datasheet, PDF (7/71 Pages) List of Unclassifed Manufacturers – Multistandard Sound Processors

PRELIMINARY DATA SHEET
MSP 34x5D
3. Application Fields of the MSP 34x5D
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/AM-Mono
According to the British, Scandinavian, Spanish, and
French TV-standards, high-quality stereo sound is
transmitted digitally. The systems allow two high-quality
digital sound channels to be added to the already exist-
ing FM/AM-channel. The sound coding follows the for-
mat of the so-called Near Instantaneous Companding
System (NICAM 728). Transmission is performed using
Differential Quadrature Phase Shift Keying (DQPSK).
Table 3–2 gives some specifications of the sound coding
(NICAM); Table 3–3 offers an overview of the modula-
tion parameters.
In the case of NICAM/FM (AM) mode, there are three dif-
ferent audio channels available: NICAM A, NICAM B,
and FM/AM-mono. NICAM A and B may belong either to
a stereo or to a dual language transmission. Information
about operation mode and about the quality of the NI-
CAM 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/AM-mono sound.
Alternatively, an automatic NICAM-FM/AM switching
may be applied.
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.
More details of this standard are given in Tables 3–1 and
3–4. For D/K and M-Korea, very similar systems are used.
Table 3–1: TV standards
TV-System
B/G
B/G
L
I
D/K
M
M-Korea
Satellite
Satellite
Position of Sound
Carrier [MHz]
5.5/5.7421875
5.5/5.85
6.5/5.85
6.0/6.552
6.5 /6.2578125 D/K1
6.5/6.7421875 D/K2
6.5/5.85 D/K-NICAM
4.5
4.5/4.724212
6.5
7.02/7.2
Sound
Modulation
FM-Stereo
FM-Mono/NICAM
AM-Mono/NICAM
FM-Mono/NICAM
FM-Stereo
FM-Mono/NICAM
FM-Mono
FM-Stereo
FM-Mono
FM-Stereo
Color System
PAL
PAL
SECAM-L
PAL
SECAM-East
NTSC
PAL
PAL
Country
Germany
Scandinavia,Spain
France
UK
USSR
Hungary
USA
Korea
Europe (ASTRA)
Europe (ASTRA)
Micronas
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