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參數(shù)資料
| 型號： | LA1060 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Antenna Switching Diversity Circuit for Car-Use FM Tuners(應用于汽車FM調(diào)諧的天線轉換分集電路) |
| 中文描述： | 天線開關多樣性電路車用FM調(diào)諧器（應用于汽車調(diào)頻調(diào)諧的天線轉換分集電路） |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 388K |
| 代理商： | LA1060 |
LA1060
No2650-5/8
Noise Detection Method of the LA1060
(1) "Count system"-used noise detection
The LA 1060 is so designed as to count the noise components of 100kHz or greater in the IF output to detect the
multipath distortion.
Car-use FM tuners are always affected by noises shown below.
(1) Ignition noise
(2) Noise attendant on modulation.
The actual modulation signal is not a continuous wave, but an intermittent signal. When the modulation signal
rises in a burst fashion, the high frequency noise components are detected in the FM demodulation output
(because in a burst fashion, overmodulation may occur or the signal rise characteristic may include the high
frequency components.)
(3) Random noise
The random noise at the weak input signal mode includes some noise components whose peak value is two to
three times as high as the average noise level.
As a result of checking the above-mentioned noises, we found that the noise of more than a given level being
present within a given period of time (example : within 100μs) is included in the FM demodulation output of car-
use FM tuners at less than a given density only.
By contrast, when the multipath distortion or skip noise occurs, the continuous noise components occur and the
above-mentioned noise density increases.
Therefore, by using "count system" to count the noise density, the detection of multipath distortion and skip noise
detection can be performed with less malfunction.
(2) Noise detection time
It is desirable that the noise detection time is faster (Note 1). However, the noise detection time (noise count time)
of the LA1060 is approximately 100μs so that the above-mentioned three types of noise cause no malfunction to
occur.
(Note 1) If the period of noise duration is 20μs or less, the noise is hardly offensive to the ears. If the period of noise
duration is 50 to 200μs, the noise is heard as a sound "buzz", but a single noise is hardly offensive to the ears.
If the period of noise duration is 500μs or more, the noise is heard as a sound "zah" which is offensive to the
ears.
Sample Application Circuit 2
Unit (resistance :
, capacitance : F)
相關PDF資料 |
PDF描述 |
|---|---|
| LA1061 | Antenna Switching Controller |
| LA1061M | Antenna Switching Controller |
| LA1065M | 2 Tuner Diversity Circuit for Car FM Tuner |
| LA1130 | AM Tuner for Car Radio(應用于車載電臺的AM調(diào)諧器) |
| LA1135 | AM Tuner System for Car Radios and Home Stereos(應用于車載電臺和家庭立體聲的AM調(diào)諧器) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LA1061 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Antenna Switching Controller |
| LA1061M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Antenna Switching Controller |
| LA1061M-TLM-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA1065M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:2 Tuner Diversity Circuit for Car FM Tuner |
| LA107 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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