參數(shù)資料
型號(hào)： 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(yè)數(shù)： 13/52頁(yè)
文件大?。?/td> 206K
代理商： SAA2501H
January 1995
13
Philips Semiconductors
Preliminary specification
Digital Audio Broadcast (DAB) decoder
SAA2501
Table 5
APU coefficient index and actual coefficient
APU COEFFICIENT INDEX C
APU
COEFFICIENT
BINARY
DECIMAL
00000000 to 00111111
0 to 63
01000000 to 01111110
64 to 126
01111111
1XXXXXXX
127
0
128 to 255
reserved
2
C
12
------
–
2
C
32
–
6
–
Fig.5 Audio Processing Unit (APU).
handbook, halfpage
audio
samples
LR
LL
RL
left output
audio
samples
right decoded
audio
samples
RR
right output
audio
samples
MGB493
From Table 5 we learned that up to coefficient index 64 the
step size is approximately
0.5 dB per coefficient
increment, and from coefficient index 64 to index 126 the
step size is approximately
1 dB per increment.
Note that the APU has no built-in overflow protection, so
the application must take care that the output signals of the
APU cannot exceed 0 dB level. For an update of the APU
coefficients, it may be required to increase some of the
coefficients and decrease some others. The APU
coefficients are always written sequentially in the fixed
sequence LL, LR, RL and RR. Therefore, to prevent
internal APU data overflow due to non-simultaneous
coefficient updating, the following steps can be followed:
1.
Write LL, LR, RL, RR once, but change only those
coefficients that must decrease; overwrite the
coefficients that must increase with their old value (so
do not change these yet).
2.
Write LL, LR, RL, RR again, but now change those
coefficients that must increase, keeping the other
coefficients unchanged.
The consequence of this two-pass coefficient updating is
that the application must keep a shadow of the current
APU coefficients (the L3 APU coefficients data item is
write-only).
Fig.6 Relation between APU coefficient index and gain.
(1) Step
0.5 dB per coefficient increment.
(2) Step
1 dB per coefficient increment.
handbook, full pagewidth
MGB494
94
64
126
127
32
00
gain
(dB)
APU coefficient index
(1)
(2)
相關(guān)PDF資料
PDF描述
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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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