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- high deviation FM-mono mode (max. deviation: approx. ±360 kHz)<br />
4-2-1-2 DSP-Section (Audio Baseband Processing)<br />
- flexible selection of audio sources to be processed<br />
- performance of terrestrial de-emphasise systems (FM, NICAM)<br />
- digitally performed FM-identification decoding and de-matrixing<br />
- digital baseband processing: volume, bass, treble<br />
- simple controlling of volume, bass, treble<br />
4-2-1-3 Analogue Section<br />
- two selectable analogue pairs of audio baseband input (= two SCART inputs) input level: 25<br />
- one selectable analogue mono input (i.e. AM sound): Not used in this chassis<br />
- two high-quality A/D converters, S/N-Ratio: >85 dB<br />
- 20 Hz to 20 kHz bandwidth for SCART-to-SCART copy facilities<br />
- loudspeaker: one pair of four-fold oversampled D/A converters. Output level per channel:<br />
max. 1.4 VRMS output resistance: max. 5 . S/N-ratio: >85 dB at maximum volume Max.<br />
noise voltage in mute mode: < 10 V (BW: 20 Hz... 16kHz)<br />
- one pair of four-fold oversampled D/A converters supplying a pair of SCART-outputs.<br />
output level per channel: max. 2 V RMS, output resistance: max. 0.5 , S/N-Ratio: >85 dB (20 Hz... 16 kHz)<br />
4-2-1-4 NICAM plus FM/AM-Mono<br />
According to the British, Scandinavian, Spanish, and French TV-standards, high-quality stereo sound is transmitted<br />
digitally. The systems allow two high-quality digital sound channels to be added to the already existing<br />
FM/AM-channel. The sound coding follows the format of the so-called Near Instantaneous Companding System<br />
(NICAM 728). Transmission is performed using Differential Quadrature Phase Shift Keying (DQPSK. Table below<br />
offers an overview of the modulation parameters.)<br />
In the case of NICAM/FM (AM) mode, there are three different audio channels available: NICAM A, NICAM B, and<br />
FM/AM-mono. NICAM A and B may belong either to a stereo or to a dual language transmission. Information about<br />
operation mode and about the quality of the NICAM signal can be read by the controlling software via the control bus.<br />
In the case of low quality (high bit error rate), the controlling software may decide to switch to the analogue FM/AMmono<br />
sound. Alternatively, an automatic NICAM-FM/AM switching may be applied.<br />
4-2-1-5 German 2-Carrier System (DUAL FM System)<br />
Since September 1981, stereo and dual sound programs have been transmitted in Germany using the 2-carrier system.<br />
Sound transmission consists of the already existing first sound carrier and a second sound carrier additionally<br />
containing an identification signal. More details of this standard are given in Tables below. For D/K very similar<br />
system is used.<br />
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