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參數資料
| 型號： | SAA7282 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Terrestrial Digital Sound Decoder TDSD2 |
| 中文描述： | 地面數字聲音解碼器TDSD2 |
| 文件頁數： | 12/25頁 |
| 文件大?。?/td> | 110K |
| 代理商： | SAA7282 |
July 1993
12
Philips Semiconductors
Product specification
Terrestrial Digital Sound Decoder (TDSD2)
SAA7282
Channel coding
Time-slots are encoded as biphase mark data. Each bit
transmitted is represented by a symbol comprising two
consecutive binary states. The first state of a symbol is
always different from the second state of the previous
symbol. The second state of the symbol is identical to the
first if the bit being transmitted is logic 0, however it is
different if the bit is logic 1 (see Table 7).
Table 7
Channel coding.
Preceding state
Transmitted bit
0
1
0
Channel coding
11
10
1
00
01
Preambles
Preambles are specific patterns providing synchronization
and identification of the sub-frames and blocks. A set of
three preambles is used. These preambles are transmitted
in the time allocated to four time-slots and are represented
by eight successive states. The first state of the preamble
is always different from the second state of the previous
symbol. Depending on this state the preambles are as
shown in Table 8.
Table 8
Preambles.
Preceding state
Preamble
B
M
W
0
1
Channel coding
11101000
11100010
11100100
00010111
00011101
00011011
The preambles preceding each digital audio sample are used to indicate the beginning of a sample as follows:
Preamble B
indicates the start of Channel A data and the beginning of a block
Preamble M
indicates the start of Channel A data but not the beginning of a block
Preamble W
indicates the start of Channel B data.
Channel status
The channel status information is organized in 192-bit words. The first bit of each word is carried in the frame with
Preamble B. The 192-bit word is organized into sections as shown in Table 9.
Table 9
Channel status codes.
BIT
CODE
DESCRIPTION
0
1
2
0
0
1
00
11
0
00
consumer
sound data
digital copy permitted
indicates digital de-emphasis switched in
indicates digital de-emphasis switched out
3, 4
5
6, 7
8 to 15
16 to 19
20 to 23
24 to 27
28, 29
30 to 191
00110001
0000
0000
1100
00
all 0s
category code
source code (don't care)
channel number (don't care)
sampling frequency (32 kHz)
clock accuracy (level II)
相關PDF資料 |
PDF描述 |
|---|---|
| SAA7282ZP | Terrestrial Digital Sound Decoder TDSD2 |
| SAA7283ZP | Terrestrial Digital Sound Decoder TDSD3 |
| SAA7283 | Terrestrial Digital Sound Decoder TDSD3 |
| SAA7283GP | Terrestrial Digital Sound Decoder TDSD3 |
| SAA7284GP | Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SAA7282GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Terrestrial Digital Sound Decoder TDSD2 |
| SAA7282ZP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Terrestrial Digital Sound Decoder TDSD2 |
| SAA7283 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Terrestrial Digital Sound Decoder TDSD3 |
| SAA7283GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Terrestrial Digital Sound Decoder TDSD3 |
| SAA7283ZP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Terrestrial Digital Sound Decoder TDSD3 |
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