JPS6471261A - Multi-frequency signal receiver - Google Patents

Multi-frequency signal receiver

Info

Publication number
JPS6471261A
JPS6471261A JP62227828A JP22782887A JPS6471261A JP S6471261 A JPS6471261 A JP S6471261A JP 62227828 A JP62227828 A JP 62227828A JP 22782887 A JP22782887 A JP 22782887A JP S6471261 A JPS6471261 A JP S6471261A
Authority
JP
Japan
Prior art keywords
frequency signal
signal
frequency
power
outputted
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
JP62227828A
Other languages
Japanese (ja)
Inventor
Wataru Ishizu
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP62227828A priority Critical patent/JPS6471261A/en
Publication of JPS6471261A publication Critical patent/JPS6471261A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To prevent the malfunction of a multi-frequency signal receiver due to voice, by receiving it as a multi-frequency signal only when the ratio of the power of the input signal excluded of the multi-frequency signal component to the power of the input signal is smaller than a prescribed value. CONSTITUTION:When a multi-frequency signal including a voice signal is inputted (90), high/low frequency signals are filtered (21, 22), limited (31, 32) and the resulting signal is detected (41-48). The detected signal enters any of corresponding ANDs 51-58, enters ORs 501, 502 and an AND 503 outputs logic 1. The input signal being the result of rejecting (71) the multi-frequency signal component is subjected to integration for a prescribed time via an AND 72 by a power circuit 73. The input power is integrated for a prescribed time by a detection circuit 75, both the outputs are compared (76), the ratio is obtained and when it is smaller than a prescribed value, 1 is outputted, and when the consecution of the multi-frequency signal is confirmed (64), a FF 63 is set. As a result, any two DC outputs of AND circuits 51-58 are outputted to an output holding circuit 59 and the result of the multi-frequency signal is outputted from corresponding terminals 81-88. Thus, the error of the multi- frequency by the voice frequency is prevented.
JP62227828A 1987-09-11 1987-09-11 Multi-frequency signal receiver Pending JPS6471261A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62227828A JPS6471261A (en) 1987-09-11 1987-09-11 Multi-frequency signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62227828A JPS6471261A (en) 1987-09-11 1987-09-11 Multi-frequency signal receiver

Publications (1)

Publication Number Publication Date
JPS6471261A true JPS6471261A (en) 1989-03-16

Family

ID=16867007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62227828A Pending JPS6471261A (en) 1987-09-11 1987-09-11 Multi-frequency signal receiver

Country Status (1)

Country Link
JP (1) JPS6471261A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5698091A (en) * 1980-01-08 1981-08-07 Nec Corp Multi-frequency signal receiver
JPS61296888A (en) * 1985-06-25 1986-12-27 Nec Corp Multiple-frequency signal receiver
JPS62144493A (en) * 1985-12-19 1987-06-27 Nec Corp Multifrequency signal receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5698091A (en) * 1980-01-08 1981-08-07 Nec Corp Multi-frequency signal receiver
JPS61296888A (en) * 1985-06-25 1986-12-27 Nec Corp Multiple-frequency signal receiver
JPS62144493A (en) * 1985-12-19 1987-06-27 Nec Corp Multifrequency signal receiver

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