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參數(shù)資料
| 型號(hào)： | TA2042F |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 CHANNEL, AUDIO PREAMPLIFIER, PDSO24 |
| 封裝： | SSOP-24 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大小： | 1172K |
| 代理商： | TA2042F |
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TA2042F
2002-10-30
5
This portion is to amplify the voltage between some recorded music signal and next one.
Voltage gains are:
For play mode:
(dB)
NF3
R
100
NF3
R
100
30k
og
20
(play)
V
G
+
W
=l
For F.F. mode:
(dB)
NF4
R
220
NF4
R
220
30k
og
20
(F.F.)
V
G
+
W
=l
Lower side cut off frequency:
For play mode:
(Hz)
)
NF3
R
(100
NF3
C
2
1
(play)
L
f
+
p
=
For F.F. mode:
(Hz)
)
NF4
R
(220
NF4
C
2
1
(F.F.)
L
f
+
p
=
This RNF3 and RNF4 value decide the sensitivity of music searching, but be careful below as table.
Sensitivity
( = GV (play), GV (F. F.)
Influence
Too high
Easy to misoperation or unstable condition.
Especially, there is influence by pin 2 voltage
variation.
Too low
Possible to be oscillation condition
Noise voltage level at tape F. F. mode is larger than play mode's one, and its noise is high frequency. Therefore
the sense amp. for F. F. mode has L. P. F. (low pass filter) circuit.
Its cut off frequency is:
(Hz)
)
30k
//
(30k
LPF
C
2
1
(L.P.F.)
H
f
W
p
=
(2) Comparator
This comparator judges whether the signal which is recorded on tape is music or noise.
If the signal level from sensor amp. is more than "Vref", this comparator judges it is "music".
On the other hand, the signal level from sensor amp. is less than "Vref", this judges"noise".
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