JPS6474890A - Multi-frequency signal detector - Google Patents

Multi-frequency signal detector

Info

Publication number
JPS6474890A
JPS6474890A JP62233061A JP23306187A JPS6474890A JP S6474890 A JPS6474890 A JP S6474890A JP 62233061 A JP62233061 A JP 62233061A JP 23306187 A JP23306187 A JP 23306187A JP S6474890 A JPS6474890 A JP S6474890A
Authority
JP
Japan
Prior art keywords
signal
detected
plural
threshold signal
threshold
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
JP62233061A
Other languages
Japanese (ja)
Inventor
Yasuo Tanaka
Kenji Tsutsumi
Noboru Ise
Ryoji Shimozono
Yasunori Ogawa
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 JP62233061A priority Critical patent/JPS6474890A/en
Publication of JPS6474890A publication Critical patent/JPS6474890A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To compare a threshold signal and a detected signal, to detect the presence and absence of the combination of a composite frequency by the compared result and to receive only a regular signal, by selectively detecting plural frequency components with a filter bank and outputting the threshold signal to be proportional to the total power of an input signal from a threshold signal generator. CONSTITUTION:A multiplexing signal is detected to combine plural m(n>m) frequencies out of plural (n) numbers of frequencies which are prepared in advance, and to be outputted by a multi-frequency detecting device. By BPFs11-1n, which are prepared in advance, of a filter bank 1 of this system, the respective frequency components are selectively outputted. By a threshold signal generating part 2, the threshold signal for signal detection to be proportional to the total power of the input signal is outputted. The threshold signal of this generating part 2 and the output signal detected by the bank 1 are compared by a comparator part 3 and according to the compared result of the comparator part 3, the presence and absence of the combination of the plural numbers (m) is detected by a detecting part 4. Then, only the regular signal is received.
JP62233061A 1987-09-17 1987-09-17 Multi-frequency signal detector Pending JPS6474890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62233061A JPS6474890A (en) 1987-09-17 1987-09-17 Multi-frequency signal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62233061A JPS6474890A (en) 1987-09-17 1987-09-17 Multi-frequency signal detector

Publications (1)

Publication Number Publication Date
JPS6474890A true JPS6474890A (en) 1989-03-20

Family

ID=16949186

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62233061A Pending JPS6474890A (en) 1987-09-17 1987-09-17 Multi-frequency signal detector

Country Status (1)

Country Link
JP (1) JPS6474890A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04318744A (en) * 1991-04-18 1992-11-10 Sharp Corp Multi-frequency receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04318744A (en) * 1991-04-18 1992-11-10 Sharp Corp Multi-frequency receiver

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