參數(shù)資料
型號(hào)： HA12203NT
廠商： Hitachi,Ltd.
英文描述： Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
中文描述： 音頻信號(hào)處理器卡座（杜比B型錄音系統(tǒng)星期日）
文件頁(yè)數(shù)： 13/97頁(yè)
文件大小： 687K
代理商： HA12203NT
HA12203NT/HA12204NT
Rev.3, Jun. 1999, page 13 of 97
A standard level of MS input pin 25.9 mVrms, therefore, the sensitivity of music sensor (S) can request it ,
by lower formulas.
S = 20log
S = 14 D [dB]
[dB]
C
25.9
A
B
A = MS Amp Gain
B = PB input Gain
×
(1/2)*
1
C = Sensed voltage
20log (A
×
B) = D [dB]
C = 130 [mVrms]
PB input Gain = 21.3 [dB]
Notes: 1. Case of one-sided channel input
Time constant of detection
Figure 6(1) generally shows that detection time is in proportion to value of capacitor C16.
But, with Attack *
2
and Recovery *
3
the detection time differs exceptionally.
C16
Function Characteristic of MS (1)
Function Characteristic of MS (2)
Function Characteristic of MS (3)
R18
Recovery
D
D
Recovery
Recovery
Attack
Attack
Attack
D
Input level
Detection level
Figure 6 Function Characteristic of MS
Like the figure 6(2), Recovery time is variably possible by value of resister R18. But Attack time gets
about fixed value. Attack time has dependence by input level. When a large signal is inputted,
Attack time is short tendency.
Notes 2. Attack
: Non- music to Music
3. Recovery : Music to Non-music
Music Sensor Output (MSOUT)
As for internal circuit of music sensor block, music sensor out pin is connected to the collector of NPN
type directly, output level will be “high” when sensing no signal. And output level will be “l(fā)ow”
when sensing signal.
Connection with microcomputer, it is requested to use external pull up resistor (R
L
= 10 k to 22 k)
Note:
Supply voltage of MSOUT pin must be less than V
CC
voltage.
The Tolerances of External Components
For Dolby NR precision securing, please use external components shown at figure 7. If leak-current are a
few electrolytic-capacitor, it can be applicable to C5 and C23.
Note:
As Dolby-NR aren't built-in at HA12204NT, R3, C5 and C23 aren't necessary.
相關(guān)PDF資料
PDF描述
HA12204NT Audio Signal Processor for Cassette Deck(音頻信號(hào)處理器)
HA12206 Audio Signal Processor for Cassette Deck
HA12206NT Audio Signal Processor for Cassette Deck
HA12207 Audio Signal Processor for Cassette Deck
HA12207NT 150000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HA12203NT/HA12204NT 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HA12204NT 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)
HA12206 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck
HA12206NT 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck
HA12207 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck
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