參數(shù)資料
型號： SAA2501H
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Digital Audio Broadcast DAB decoder
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT-307-2, QFP-44
文件頁數(shù)： 6/52頁
文件大?。?/td> 206K
代理商： SAA2501H
January 1995
6
Philips Semiconductors
Preliminary specification
Digital Audio Broadcast (DAB) decoder
SAA2501
TMS
TDI
FSCLK384
FSCLKM
MCLK24
40
41
42
43
44
boundary scan test mode select input
boundary scan test data input
sample rate clock frequency indication input
sample rate clock source selection for the master input
master clock frequency indication input
I
I
I
I
I
SYMBOL
PIN
DESCRIPTION
TYPE
Fig.2 Pin configuration (QFP44).
dbook, full pagewidth
1
2
3
4
5
6
7
8
9
10
11
33
32
31
30
29
28
27
26
25
24
23
1
1
1
1
1
1
1
1
2
2
2
4
4
4
4
4
3
3
3
3
3
3
FDFSY
FDAI
FDAO
WS
SCK
GND3
FDEF
SD
L3MODE
L3DATA
L3CLK
M
F
F
T
T
T
T
T
T
T
V
RESET
FSCLK
FSCLKIN
MCLK
V
GND1
MCLKOUT
MCLKIN
X22OUT
X22IN
STOP
DD1
U
C
C
C
G
C
C
C
C
C
C
SAA2501
D
MBE113
7
FUNCTIONAL DESCRIPTION
7.1
Coding system
The perceptual audio encoding/decoding scheme defined
within the “ISO/IEC 11172-3 MPEG Standard”allows for a
high reduction in the amount of data needed for digital
audio whilst maintaining a high perceived sound quality.
The coding is based upon a psycho-acoustic model of the
human auditory system. The coding scheme exploits the
fact that the human ear does not perceive weak spectral
components that are in the proximity (both in time and
frequency) of loud components. This phenomenon is
called masking.
For layers I and II of ISO/MPEG the broadband audio
signal spectrum is split into 32 sub-bands of equal
bandwidth. For each sub-band signal a masking threshold
is calculated. The sub-band samples are then
re-quantized to such an accuracy that the spectral
distribution of the re-quantization noise does not exceed
the masking threshold. It is this reduction of representation
accuracy which yields the data reduction. The
re-quantized sub-band signals are multiplexed, together
with ancillary information regarding the actual
re-quantization, into a MPEG audio bitstream.
相關(guān)PDF資料
PDF描述
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
SAA2505H-M1 Digital multi-channel audio IC DUET
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
SAA2503HT 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG2 audio decoder
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