Philips Semiconductors
Terrestrial digital sound decoder for
conventional intercarrier PLL-IF systems
Preliminary specification
SAA7284
handbook, full pagewidth
ERROR_COUNT
ERROR_MAX
YES
NO
Output is
unchanged
AM bit = LOW
MUTEB pin = HIGH
RSSF = 1
YES
NO
C4ov BIT = 0
NO
Output is
unchanged
AM bit = LOW
MUTEB pin = HIGH
YES
EXT or FM INPUT
SWITCHED IN
NO
YES
Output is
unchanged
AM bit = HIGH (1)
MUTEB pin = LOW(1)
When error_count is
less than error_min,
AM bit = LOW,
MUTEB pin = HIGH
SOUND APPLICATION
DUAL MONO
YES
NO
DUAL MONO MODE
LEFT = RIGHT = M1
SELECTED
YES
NO
Output is
unchanged
AM bit = LOW
MUTEB pin = HIGH
MGB465
Output is switched
to FM input
AM bit = HIGH
MUTEB pin = LOW
When error_count is less
than error_min, the output
is switched back to NICAM
and AM bit = LOW,
MUTEB pin = HIGH
(1) Indicating that a mute may occur when user returns to NICAM source.
Fig.4 Flow diagram showing SAA7284 automatic muting function.
1996 Oct 24
11