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參數資料
| 型號： | 93526374518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | PLASTIC, SOT-205, QFP-44 |
| 文件頁數： | 41/71頁 |
| 文件大小： | 269K |
| 代理商： | 93526374518 |
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2000 Aug 04
46
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
7.4.2
NICAM STATUS REGISTER (NSR)
Table 75 NICAM status register (subaddress 1)
Table 76 Description of the NICAM status register bits; notes 1 and 2
Notes
1. The TDA9874A 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 is set to logic 1, independent of bit AMUTE in the
NICAM configuration register being set or not.
2. 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
NICAM ERROR COUNT REGISTER (NECR)
Bits B7 to B0 contain the number of errors occurring in the previous 128 ms period. The register is updated every
128 ms.
Table 77 NICAM error count register (subaddress 2)
76543210
C4
C3
C2
C1
OSB
CFC
S/MB
D/SB
BIT
SYMBOL
DESCRIPTION
7
C4
NICAM application control bits: these bits correspond to the control bits C1 to C4 in the
NICAM transmission.
6C3
5C2
4C1
3
OSB
Synchronization bit: if bit OSB = 1 it indicates that the device has both frame and C0
(16 frame) synchronization. If bit OSB = 0 it indicates that the audio output from the
NICAM part is digital silence.
2
CFC
Conguration change: if bit CFC = 1 it indicates a conguration change at the 16 frame
(C0) boundary.
1
S/MB
Identication of NICAM stereo: if bit S/MB = 1 it indicates stereo mode.
0
D/SB
Identication of NICAM dual mono: if bit D/SB = 1 it indicates dual mono mode.
76543210
B7
B6
B5
B4
B3
B2
B1
B0
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