1996 Oct 24

21

Philips Semiconductors

Preliminary specification

Terrestrial digital sound decoder for

conventional intercarrier PLL-IF systems

SAA7284

SYSTEM PERFORMANCE

Bit Error Rate (BER)

are related to the picture carrier reference level (0 dB) and based on the output level of the set up as shown in Fig.8.

All measurements are at RF and using Philips Semiconductors SAA7284 Applications Board.

Table 17 System performance

Notes

1. Measurements made with colour bar at 100% modulation.

a) FM level =

−10 dB system I; −13 dB system BG.

b) NICAM level =

−20 dB (unless otherwise specified).

2. 10 dB sound shelf with extended bandwidth for NICAM signal.

3. 14 dB sound shelf with extended bandwidth for NICAM signal.

Acquisition time

Maximum acquisition time = 1 s, measured from power-on to reset in-sync condition achieved.

SYSTEM I

SYSTEM BG

UNIT

Picture carrier RF level (FM deviation =

±50 kHz)

35

35

35

dB

NICAM level with respect to picture carrier (FM deviation =

±50 kHz)

−35

−34

−32

dB

FM overmodulation

>120

>100

>100

kHz