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| 型號： | HA12206 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Audio Signal Processor for Cassette Deck |
| 中文描述： | 音頻信號處理器卡座 |
| 文件頁數(shù)： | 12/32頁 |
| 文件大小： | 180K |
| 代理商： | HA12206 |
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HA12206NT
Rev.3, Jun. 1999, page 12 of 32
The Sensitivity of Music Sensor
Frequency characteristics of MS amplification stage is shown by figure 3.
G
V
f
f1
f2
f3
f1 =
[Hz]
1
2
π
C5
(R5 + 100k)
1
2
π
C5
R5
f2 =
[Hz]
f3 = 25k
[Hz]
Figure 3 Frequency Characteristic of MS AMP
Occasion of the external component of figure 2, f1 is 430Hz and f2 is 1.1kHz.
As the MS sensitivity is prescribed at 5kHz, this stage’s gain is 7.9dB. But in only one-sided channel input
case, this gain is considered as –6dB down, because the other channel input pin is imaginary earth. That is,
the gain from RPOUT to MSDET is 1.86dB.
As the detection sensitivity at MSDET is fixed 130mVrms, the sensitivity at RPOUT (8 pin or 23 pin) is
calculated by the following formula.
130mV
1.86
20
Because of RPOUT=580mVrms=0dB, therefore, the MS sensitivity becomes –14.8dB.
That is the detection level.
= 105mV
10 ^
Time Constant of Detection
Figure 4 (1) generally shows that detection time is in proportion to value of capacitor C16. But, with
Attack*
Non-music
→
Music
2. Recovery : Music
→
Non-music
1
and Recovery*
2
the detection time differs exceptionally.
Note: 1. Attack :
C6
D
D
Function Characteristics of MS (1)
Function Characteristics of MS (2)
Function Characteristics of MS (3)
R6
Recovery
Attack
Attack
Attack
Recovery
Recovery
D
Input level
Detection level
Figure 4 Function Characteristic of MS
Like the figure 4 (2), Recovery time is variably possible by value of resistor R6. 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.
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| HA12206NT | 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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