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參數(shù)資料
| 型號(hào)： | LA1065M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 2 Tuner Diversity Circuit for Car FM Tuner |
| 中文描述： | 2調(diào)諧器電路的多樣性汽車FM調(diào)諧器 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 118K |
| 代理商： | LA1065M |
LA1065M
No.3312-4/8
(2) S meter voltage comparison
For a medium field, the sound may be better if the antenna is switched by comparing S meter DC voltage rather
than using multi-path distortion detection when, for example, there is quite a difference (more than 10dB) in
antenna sensitivity between MAIN and SUB. On the LA1065M, a built-in comparator detects the medium field,
and compares S meter DC voltage in order to switch the antenna.
(3) Weak field detection and antenna fixing (MAIN)
There is a difference in antenna sensitivity between MAIN and SUB in a weak field, so sensitivity will be
insufficient even if switched to SUB.
The LA1065M uses a comparator, as shown below, to detect the weak field and fix the switching signal to the
MAIN side.
(4) Very strong field detection and antenna fixing (SUB)
Interference such as I.M. (intermodulation) and cross modulation is generated in a very strong field. One
countermeasure is to use a PIN diode for antenna damping, but here the lower antenna gain on the SUB side is
utilized to fix the antenna to the SUB side when the electric field is strong. Also, with LA1065M, operation
returns to normal when multi-path is generated.
(5) AGC voltage output
As described in the section on bottom detection-type noise AGC, AGC voltage goes high when there is a lot of
noise on both MAIN and SUB sides. This voltage can be used to apply SNC, HCC and so on when the conditions
are poor for both MAIN and SUB.
(6) S meter switch
The LA1065M has built-in S meter switch so that SNC can be applied according to the MAIN and SUB switching
output. When the antenna is on MAIN, SNC is applied by MAIN side S meter voltage, and when it is on SUB, by
SUB side meter voltage.
(7) Logic section
The LA1065M operation is shown in th table below.
Unit (resistance :
)
MAIN multi-
path detection
With noise
No noise
*
*
*
*
No noise
Large noise
Small noise
* : Under any conditions
No noise
With noise
*
*
*
No noise
With noise
Medium noise
Medium noise
*
*
*
MAIN>SUB
MAIN<SUB
*
*
*
*
Strong field
Strong field
Weak field
Medium field
Medium field
Strong field
Strong field
Strong field
Strong field
Weak-medium field
Weak-medium field
*
Weak-medium field
Weak-medium field
Very strong field
Very strong field
Very strong field
Very strong field
SUB side
MAIN side
MAIN side
MAIN side
SUB side
SUB side
MAIN side
SUB side
MAIN side
SUB multi-
path detection
MAIN S meter
voltage
SUB S meter
voltage
FE AGC voltage
MAIN/SUB
switching output
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