JPS6175641U

JPS6175641U -

Info

Publication number: JPS6175641U
Application number: JP15909384U
Authority: JP
Priority date: 1984-10-19
Filing date: 1984-10-19
Publication date: 1986-05-21

Description

[Brief explanation of the drawing]

第１図はこの考案によるノイズフイルタの１実
施例を用いたＦＭ受信機の主要部のブロツク図、
第２図は従来のノイズフイルタを用いたＦＭ受信
機の主要部のブロツク図、第３図は同実施例及び
従来のノイズフイルタの周波数特性図、第４図は
同実施例及び従来のノイズフイルタの位相特性図
、第５図は同実施例及び従来のノイズフイルタの
群遅延特性図である。２……第２中間周波増幅部、６……振幅制限部
、８……周波数弁別部、２２……第２のコンデン
サ、２４……第２のリアクタ、２５……第２の直
列回路、２６……第１のコンデンサ、２８……第
１のリアクタ、２９……第１の直列回路。 Figure 1 is a block diagram of the main parts of an FM receiver using one embodiment of the noise filter according to this invention.
Figure 2 is a block diagram of the main parts of an FM receiver using a conventional noise filter, Figure 3 is a frequency characteristic diagram of the same embodiment and a conventional noise filter, and Figure 4 is a diagram of the same embodiment and a conventional noise filter. FIG. 5 is a group delay characteristic diagram of the same embodiment and a conventional noise filter. 2... Second intermediate frequency amplification section, 6... Amplitude limiting section, 8... Frequency discrimination section, 22... Second capacitor, 24... Second reactor, 25... Second series circuit, 26 ... first capacitor, 28 ... first reactor, 29 ... first series circuit.

Claims

[Scope of utility model registration request]

An FM receiver comprising: an intermediate frequency amplifying section that amplifies an FM-modulated intermediate frequency signal; an amplitude limiting section to which the output signal of the amplifying section is supplied; and a frequency discriminating section to which the output signal of the amplitude limiting section is supplied. In the machine, a first capacitor including a first capacitor and a first reactor is connected between the output side of the amplifying section and the reference potential point.
A second series circuit consisting of a second capacitor and a second reactor is provided in parallel with the first series circuit, and the resonant frequency of the first series circuit is set to the lower limit of the intermediate frequency signal. frequency is selected near the upper limit frequency of the intermediate frequency signal, and the resonant frequency of the second series circuit is selected near the upper limit frequency of the intermediate frequency signal.
Nozzle filter for receiver.