參數(shù)資料
型號(hào)： HA12231FP
廠商： Hitachi,Ltd.
英文描述： Audio Signal Processor for Car Deck (PB 1 Chip)
中文描述： 音頻信號(hào)處理器為汽車甲板（鉛1片）
文件頁(yè)數(shù)： 12/25頁(yè)
文件大小： 132K
代理商： HA12231FP
HA12231FP
12
1. Search mode
G
V1
= (23.5dB
3.5dB) + 20log 1 +
[dB]
90k
REX2
f
1
=
[Hz], f
2
= 25k [Hz]
1
2
π
CEX2
REX2
2. Repeat mode
G
V2
= (23.5dB
3.5dB) + 20log 1 +
[dB]
90k
REX1
f
3
=
[Hz], f
4
= 25k [Hz]
1
2
π
CEX1
REX1
The sensitivity of music sensor (S) is computed by the formula mentioned below.
S = 12.7
G
V
[dB]
S is 6 dB down in case of one-side channel.
Notes: 1. Search mode: G
V1
, Repeat mode: G
V2
2. Standard level of TAI pin (Dolby level correspondence) = 30 mVrms
3. Standard sensing level of music sensor = 130 mVrms
Item
REX1, 2
CEX1, 2
G
V1, 2
33.5 dB
f
1, 3
663 Hz
f
2, 4
25 kHz
S
(one side
channel)
S
(both
channel)
Search mode
24 k
2.4 k
0.01
μ
F
1
μ
F
14.8 dB
33.0 dB
20.8 dB
39.0 dB
Repeat mode
Note:
51.7 dB
66.3 Hz
25 kHz
This MS presented hysteresis lest MS(OUT) terminal should turn over again High level or Low level,
in case of thresh S level constantly.
Music Sensor Time Constant
1. Sensing no signal to signal (Attack) is determined by C1, 0.01
μ
F to 1
μ
F capacitor C1 can be
applicable.
2. Sensing signal to no signal (Recovery) is determined by C1 and R1, however preceding (1), 100 k
to 1
M
can be applicable.
Music Sensor Output (MS(OUT))
As for the internal circuit of music sensor block, music sensor output pin is connected to the collector of
NPN type directly, therefore, output level will be “high” when sensing no signal. And output level will be
“l(fā)ow” when sensing signal.
I
L
=
* MS(OUT)
LO
: Sensing signal (about 1V)
DV
CC
MS(OUT)
LO
*
R
L
Note:
Supply voltage of MS(OUT) pin must be less than V
CC
voltage.
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