LA1065M Просмотр технического описания (PDF) - SANYO -> Panasonic

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производитель

LA1065M

2 Tuner Diversity Circuit for Car FM Tuner

SANYO -> Panasonic 

Sample Application Circuit

LA1065M

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.

No.3312-3/8

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