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JPS5486210A - Multi-frequency signal receiver - Google Patents

Multi-frequency signal receiver

Info

Publication number
JPS5486210A
JPS5486210A JP15419277A JP15419277A JPS5486210A JP S5486210 A JPS5486210 A JP S5486210A JP 15419277 A JP15419277 A JP 15419277A JP 15419277 A JP15419277 A JP 15419277A JP S5486210 A JPS5486210 A JP S5486210A
Authority
JP
Japan
Prior art keywords
bpf
circuit
signal
agc
delay time
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
JP15419277A
Other languages
Japanese (ja)
Inventor
Yujiro Sasahara
Atsushi Aiiso
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15419277A priority Critical patent/JPS5486210A/en
Publication of JPS5486210A publication Critical patent/JPS5486210A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE: To prevent error detection caused by the transient response voltage of a BPF by providing an analog gate circuit to the output of an AGC circuit for multi- frequency signal reception and by equipping a circuit which outputs a control signal allowing the gate to open after the operation delay time of the AGC.
CONSTITUTION: When a multi-frequency signal is applied to the AGC circuit, time response TIM applies a signal to gates of field effect transistors FET of analog gate circuits G1 to Gn after operation delay time (t) of the AGC circuit. As a result, FETs turn OFF, it is prevented that BPF1 to BPFn are applied with an excessive input within the operation delay time of the AGC circuit, and the transient response time becomes slight, so that it will not malfunction. Further, when a shortperiod signal such as a noise arrives, the signal attenuates before the gate circuit opens and, in cosequence, the shortperiod noise is not applied to BPF1 to BPFn, so that stable operation can be obtained.
COPYRIGHT: (C)1979,JPO&Japio
JP15419277A 1977-12-21 1977-12-21 Multi-frequency signal receiver Pending JPS5486210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15419277A JPS5486210A (en) 1977-12-21 1977-12-21 Multi-frequency signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15419277A JPS5486210A (en) 1977-12-21 1977-12-21 Multi-frequency signal receiver

Publications (1)

Publication Number Publication Date
JPS5486210A true JPS5486210A (en) 1979-07-09

Family

ID=15578839

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15419277A Pending JPS5486210A (en) 1977-12-21 1977-12-21 Multi-frequency signal receiver

Country Status (1)

Country Link
JP (1) JPS5486210A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5675754A (en) * 1979-11-27 1981-06-23 Hitachi Denshi Ltd Synchronizing signal pickup system
JPS6471292A (en) * 1987-08-14 1989-03-16 Mitel Corp Dial tone detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5675754A (en) * 1979-11-27 1981-06-23 Hitachi Denshi Ltd Synchronizing signal pickup system
JPS6471292A (en) * 1987-08-14 1989-03-16 Mitel Corp Dial tone detector

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