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參數(shù)資料
| 型號(hào)： | SM5904CF |
| 廠(chǎng)商： | Seiko NPC Corporation |
| 英文描述： | compression and non compression type |
| 中文描述： | 壓縮和非壓縮類(lèi)型 |
| 文件頁(yè)數(shù)： | 30/35頁(yè) |
| 文件大?。?/td> | 266K |
| 代理商： | SM5904CF |
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NIPPON PRECISION CIRCUITS-30
SM5904BF
Digital audio interface
When the DIT flag is set to 1, the digital audio inter-
face output from pin DIT is enabled. The output
data structure is modulated using a preamble and
biphase mark encoding.
Figure 5. Frame format
Figure 6. Subframe format
Channel 2
M
Channel 1
W
B
W
M
W
Frame 0
Frame 191
Channel 2
Channel 1
Channel 2
Channel 1
Frame 1
Sub Frame
Sub Frame
Start Block
Auxiliary
Preamble
Audio Sample Word
V
U
C
P
0
3 4
7 8
27
28
31
L
M
L
Validity Flag
User Data
Channel Status
Parity Bit
Preamble
Channel coding
Leading symbol = 0
11101000
11100010
11100100
Leading symbol = 1
00010111
00011101
00011011
B
M
W
The SM5904BF starts with 0, so only the preamble patterns for leading symbol = 0 are used.
Preamble
The preamble is a particular bit pattern used to per-
form subframe and block synchronization and dis-
crimination, assigned to one of 4 time slot divisions
(0 to 3), comprising 8 continuous biphase modulat-
ed transfer rate status indicators.
There are 3 types of preamble. The leading pream-
ble pattern of all blocks is preamble pattern B,
which is then followed by preamble pattern M for
channel 1, and preamble pattern W for channel 2.
Digital audio sample data and auxiliary audio
The digital audio sample data is a 20-bit digitized
audio signal. Auxiliary audio data, on the other
hand, can be audio sample data of varying length.
The SM5904BF uses a 16-bit audio data structure
internally with audio data output bits 4 to 11 set to 0
and bits 12 to 27 output in LSB first format.
Audio sample validity
The validity flag is set to 0 when the digital audio
sample data is output correctly, or it is set to 1 if the
output is incorrect. It is also set to 1 if encoding
does not start when the device is operating in
forced mute, microcontroller forced mute, and
shockproof mode.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SM5905AF | 制造商:NPC 制造商全稱(chēng):Nippon Precision Circuits Inc 功能描述:compression and non compression type shock-proof memory controller |
| SM5906AF | 制造商:NPC 制造商全稱(chēng):Nippon Precision Circuits Inc 功能描述:Shock-proof Memory Controller for Video CD Players |
| SM5907 | 制造商:NPC 制造商全稱(chēng):Nippon Precision Circuits Inc 功能描述:compression and non compression type shock-proof memory controller |
| SM5907AF | 制造商:NPC 制造商全稱(chēng):Nippon Precision Circuits Inc 功能描述:compression and non compression type shock-proof memory controller |
| SM5908 | 功能描述:TVS 二極管 - 瞬態(tài)電壓抑制器 1500W 5.0V Unidirect RoHS:否 制造商:Vishay Semiconductors 極性:Bidirectional 工作電壓: 擊穿電壓:58.9 V 鉗位電壓:77.4 V 峰值浪涌電流:38.8 A 系列: 封裝 / 箱體:DO-214AB 最小工作溫度:- 55 C 最大工作溫度:+ 150 C |
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