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LA1065M bảng dữ liệu(PDF) 3 Page - Sanyo Semicon Device |
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LA1065M bảng dữ liệu(HTML) 3 Page - Sanyo Semicon Device |
3 / 8 page LA1065M No.3312-3/8 Sample Application Circuit Unit (resistance : Ω, capacitance : F) Operating Principle (1) Multi-path distortion detection • Overview The LA1065M compares the high frequency noise elements in the S meter output from the two tuners to perform multi-path distortion detection. In addition to the higher harmonic distortion due to multi-path, the S meter noise includes pulse noise such as car engine ignition noise, distortion elements due to modulation, phase noise and so on. All of this noise causes misoperation of multi-path distortion detection. The LA1065M resolves this problem through use of a unique noise count comparison method and the bottom detection-type noise AGC. • Noise count comparison The causes of misoperation in a diversity reception system, which are pulse noise, distortion elements caused by modulation, and phase noise, exist almost equally for MAIN and SUB. Also, the multi-path distortion to be detected tends to exist on either the MAIN or SUB side. The LA1065M uses an up/down counter to compare the noise counts of MAIN and SUB and detect multi-path. • Bottom detection noise AGC As described above, the S meter noise also exists on both MAIN and SUB sides, so when there is noise on both sides, AGC goes on to prevent misoperation. On the other hand, when multi-path is generated and noise is on one side or the other, AGC does not go on, enabling high sensitivity detection. • A combination of the above methods is used to make the LA1065M capable of accurate multi-path detection. |
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Mô tả tương tự - LA1065M |
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