參數(shù)資料
型號(hào)： SAA2502
廠商： NXP Semiconductors N.V.
英文描述： ISO/MPEG Audio Source Decoder
中文描述： 的ISO / MPEG音頻信源解碼器
文件頁數(shù)： 41/64頁
文件大?。?/td> 318K
代理商： SAA2502
1997 Nov 17
41
Philips Semiconductors
Preliminary specification
ISO/MPEG Audio Source Decoder
SAA2502
7.6.6.8
Frame headers
Information about input data, derived by the SAA2502 from the input data frame headers, may be read from the frame
header items. Both the frame header bytes decoded from the input bit stream and the header bytes used for the actual
decoding may be read.
The decoded frame header item is valid independent of the value of status flag INSYNC. It shows, for example, the
decoded headers while the SAA2500 is in the process of synchronizing.
The used frame header item is only valid if status flag INSYNC is set. The used header bytes are derived by the SAA2502
from the decoded header bytes by filling in known header fields (e.g. those that have a fixed value) and overruling
detected errors.
Table 47
Decoded frame header: 3 bytes (read-only, restricted block type, local address = 21H)
Note
1.
The EMPH1 and EMPH0 bits may only be used to monitor the current de-emphasis indication. Corresponding
de-emphasis is performed automatically before outputting the baseband audio signal.
Table 48
Used frame header: 3 bytes (read-only, restricted block type, local address = 22H)
Note
1.
The EMPH1 and EMPH0 bits may only be used to monitor the current de-emphasis indication. Corresponding
de-emphasis is performed automatically before outputting the baseband audio signal.
Table 49
Explanation of bits in Tables 47 and 48
SUBSEQUENT BYTES
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Decoded header byte 1
Decoded header byte 2
Decoded header byte 3
SY3
BR3
MOD1
SY2
BR2
MOD0
SY1
BR1
MODX1
SY0
BR0
MODX0
ID
FS1
COPR
LAY1
FS0
ORIG
LAY0
undefined undefined
EMPH1
(1)
NOPR
EMPH0
(1)
SUBSEQUENT BYTES
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Used header byte 1
Used header byte 2
Used header byte 3
1
1
1
1
ID
FS1
COPR
1
LAY0
undefined undefined
EMPH1
(1)
NOPR
BR3
MOD1
BR2
MOD0
BR1
MODX1
BR0
MODX0
FS0
ORIG
EMPH0
(1)
BIT
DESCRIPTION
SY3 to SY0
ID
LAY1 and LAY0
NOPR
BR3 to BR0
FS1 and FS0
MOD1 and MOD0
MODX1 and MODX0
COPR
ORIG
EMPH1 and EMPH0
last 4 bits of the synchronization word
algorithm identification
layer
flag for CRC on header plus bit allocation plus scale factor select information
bit rate index
sample rate index
mode
mode extension
copyright flag
original or home copy flag
audio de-emphasis indication
相關(guān)PDF資料
PDF描述
SAA2502H ISO/MPEG Audio Source Decoder
SAA2503 MPEG2 audio decoder(MPEG2 音頻譯碼器)
SAA2503HT MPEG2 audio decoder
SAA2505H-M1 Digital multi-channel audio IC DUET
SAA2505 Digital multi-channel audio IC DUET
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
SAA2503HT 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG2 audio decoder
SAA2505 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital multi-channel audio IC DUET
SAA2505H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital multi-channel audio IC DUET
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