JPS55127707A - Frequency-modulated wave demodulation system - Google Patents

Frequency-modulated wave demodulation system

Info

Publication number
JPS55127707A
JPS55127707A JP3502079A JP3502079A JPS55127707A JP S55127707 A JPS55127707 A JP S55127707A JP 3502079 A JP3502079 A JP 3502079A JP 3502079 A JP3502079 A JP 3502079A JP S55127707 A JPS55127707 A JP S55127707A
Authority
JP
Japan
Prior art keywords
frequency
filter
base band
band
pass filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3502079A
Other languages
Japanese (ja)
Inventor
Yoshihiro Konishi
Yozo Uchiumi
Hajime Matsumura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Broadcasting Corp
Original Assignee
Nippon Hoso Kyokai NHK
Japan Broadcasting Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Hoso Kyokai NHK, Japan Broadcasting Corp filed Critical Nippon Hoso Kyokai NHK
Priority to JP3502079A priority Critical patent/JPS55127707A/en
Publication of JPS55127707A publication Critical patent/JPS55127707A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE: To realize a negative feedback-type frequency-modulated wave demodulation system with phase rotation of signals reduced, by fluctuating the local oscillation frequency and the center frequency of an intermediate frequency band pass filter by the output of a demodulator.
CONSTITUTION: The input signal from antenna 1 is demodulated to a base band signal through down converter 2, intermediate frequency amplification stages 4 and 6 including and pass filter 5, and frequency discriminator 7 and is outputted through amplifier 8. A part of the demodulated base band signal is applied to base band band pass filter 11 and base band low-pass filter 12 through amplifiter 8'. The output of filter 11 fluctuates the oscillation frequency of a local oscillator according to amplitude change of high band components of the base band signal. The output of filter 12 fluctuates the pass band center frequency of filter 5.
COPYRIGHT: (C)1980,JPO&Japio
JP3502079A 1979-03-27 1979-03-27 Frequency-modulated wave demodulation system Pending JPS55127707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3502079A JPS55127707A (en) 1979-03-27 1979-03-27 Frequency-modulated wave demodulation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3502079A JPS55127707A (en) 1979-03-27 1979-03-27 Frequency-modulated wave demodulation system

Publications (1)

Publication Number Publication Date
JPS55127707A true JPS55127707A (en) 1980-10-02

Family

ID=12430374

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3502079A Pending JPS55127707A (en) 1979-03-27 1979-03-27 Frequency-modulated wave demodulation system

Country Status (1)

Country Link
JP (1) JPS55127707A (en)

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