tda9874h NXP Semiconductors, tda9874h Datasheet - Page 37

• Manufacturer Part Number: tda9874h
• Description: Digital Tv Sound Demodulator/decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.4.2
Table 60 NICAM status register (subaddress 1)
Table 61 Description of the NICAM status register bits
7.4.2.1
The TDA9874H does not support the extended control modes. Therefore, the program of the first sound carrier
(i.e. FM mono or AM) is selected for reproduction in case bit C3 = 1, independent of bit AMUTE in the NICAM
Configuration Register being set or not.
When a NICAM transmitter is switched off, the device will lose synchronization. In that case the program of the first sound
carrier is selected for reproduction, independent of bit AMUTE being set or not.
7.4.3
Bits B7 to B0 contain the number of errors occurring in the previous 128 ms period. The register is updated every
128 ms.
Table 62 NICAM error count register (subaddress 2)
2000 Jun 26
Digital TV sound demodulator/decoder
BIT
C4
B7
7
7
6
5
4
3
2
1
0
7
NICAM
NICAM
Notes
STATUS REGISTER
ERROR COUNT REGISTER
SYMBOL
S/MB
D/SB
OSB
CFC
C3
C4
C3
C2
C1
B6
6
6
NICAM application control bits: these bits correspond to the control bits C1 to C4 in the
NICAM transmission.
Synchronization bit: bit OSB = 1 indicates that the device has both frame and C0
(16 frame) synchronization. Bit OSB = 0 indicates the audio output from the NICAM part
is digital silence.
Configuration change: bit CFC = 1 indicates a configuration change at the 16 frame
(C0) boundary.
Identification of NICAM stereo: bit S/MB = 1 indicates stereo mode.
Identification of NICAM dual mono: bit D/SB = 1 indicates dual mono mode.
C2
B5
5
5
C1
B4
4
4
37
OSB
B3
3
3
DESCRIPTION
CFC
B2
2
2
S/MB
B1
1
1
Product specification
TDA9874H
D/SB
B0
0
0