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參數資料
| 型號： | U4276B |
| 英文描述： | FM Multipath Noise Cancellation |
| 中文描述： | 調頻多徑噪 |
| 文件頁數： | 2/8頁 |
| 文件大小： | 88K |
| 代理商： | U4276B |
U4276B
TELEFUNKEN Semiconductors
Rev. A1, 05-Sep-96
Preliminary Information
2 (8)
FSIN / BFSOUT
FSIN
40 A
94 8647
V
S
BFSOUT
All information about reception conditions is derived
from the fieldstrength signal. The fieldstrength signal at
FSIN is initially buffered so as not to impair the character-
istics of the IF IC and is available at BFSOUT.
AVFS
AVFS
40 A
94 8648
The fieldstrength signal at buffer output BFSOUT is aver-
aged over time and applied to input AVFS via an RC
low-pass filter with a large time constant.
MUTE
94 8651
MUTE
The function unit MNC can be controlled externally via
this pin. Blanking occurs when the voltage at the MUTE
pin falls below 1 V.
MPXIN / MPXOUT
94 8649
V
S
50 k
MPXIN
50 k
94 8650
V
S
60 k
60 k
MPXOUT
200 A
V
S
The MPX signal is fed directly from the FM demodulator
to input MPXIN and is available amplified by a factor of
1.5 at MPXOUT. The MPX signal is blanked out in the
event of multipath interference or when MUTE is acti-
vated externally in the circuit part MNC (Multipath Noise
Canceller). In all other cases, the MPX signal passes
through the IC unchanged.
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