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參數(shù)資料
| 型號： | SAA2501 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Digital Audio Broadcast DAB decoder |
| 中文描述： | 數(shù)字音頻廣播民建聯(lián)的解碼器 |
| 文件頁數(shù)： | 31/52頁 |
| 文件大?。?/td> | 206K |
| 代理商： | SAA2501 |
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January 1995
31
Philips Semiconductors
Preliminary specification
Digital Audio Broadcast (DAB) decoder
SAA2501
Table 28
ASSD item; 2 bytes (read-only)
The ASSD item and the (extended) Program Associated Data [(X)PAD] item (see Section 7.20.11) may be read together
as a single item.
7.20.11 A
NCILLARY
D
ATA
/XPAD
ITEM
The last 54 bytes of each ISO/MPEG frame, which may carry Ancillary Data (AD), are buffered by the SAA2501 to be
read by the host. The subsequent Ancillary Data bytes are read in reversed order with respect to their order in the input
data bitstream. The first item data byte is the last frame byte in the input bitstream. The Ancillary Data item is refilled at
every frame. The host must either know or determine itself how many of the Ancillary Data bytes are valid per frame. The
Ancillary Data item only has significance if status flag INSYNC is set.
Table 29
Ancillary Data item; 54 bytes (read-only)
Likewise, when EU147 input data is being decoded, the PAD and XPAD bytes contained in each frame may be read,
with the 2 PAD bytes first, followed by a maximum of 52 XPAD bytes. The subsequent PAD and XPAD bytes are read
in reversed order with respect to their order in the input data bitstream. The first item data byte is the last PAD byte in
the input bitstream. The host must determine itself how many of the XPAD bytes are valid per frame by interpretation on
the PAD. The (X)PAD item only contains significant data if status flag INSYNC is set.
Table 30
(X)PAD item; 54 bytes (read-only)
7.20.12 APU
COEFFICIENTS ITEM
The APU coefficients are set by writing their 8 bit indices to the 4-byte APU coefficient item. Only the 7 LSBs are valid.
The MSB must be zero. At a device reset, indices LL and RR are set to 00000000 (‘no attenuation’) and indices LR and
RL to 01111111 (infinite attenuation; no crosstalk).
SUBSEQUENT
BYTES
7
6
5
4
3
2
1
0
ASSD
bytes 1 and 2
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
SUBSEQUENT
BYTES
7
6
5
4
3
2
1
0
AD byte 1 to
AD byte 54
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
SUBSEQUENT
BYTES
7
6
5
4
3
2
1
0
PAD byte 1
PAD byte 2
XPAD
bytes 1 to 52
bit 7
bit 7
bit 7
bit 6
bit 6
bit 6
bit 5
bit 5
bit 5
bit 4
bit 4
bit 4
bit 3
bit 3
bit 3
bit 2
bit 2
bit 2
bit 1
bit 1
bit 1
bit 0
bit 0
bit 0
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA2501H | Digital Audio Broadcast DAB decoder |
| SAA2502 | ISO/MPEG Audio Source Decoder |
| SAA2502H | ISO/MPEG Audio Source Decoder |
| SAA2503 | MPEG2 audio decoder(MPEG2 音頻譯碼器) |
| SAA2503HT | MPEG2 audio decoder |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA2501H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Audio Broadcast DAB decoder |
| SAA2501HB-S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Audio Decoder & Support |
| SAA2502 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ISO/MPEG Audio Source Decoder |
| SAA2502H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ISO/MPEG Audio Source Decoder |
| SAA2503 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG2 audio decoder |
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