JPS57202162A - Signal detecting circuit - Google Patents

Signal detecting circuit

Info

Publication number
JPS57202162A
JPS57202162A JP8660681A JP8660681A JPS57202162A JP S57202162 A JPS57202162 A JP S57202162A JP 8660681 A JP8660681 A JP 8660681A JP 8660681 A JP8660681 A JP 8660681A JP S57202162 A JPS57202162 A JP S57202162A
Authority
JP
Japan
Prior art keywords
signal
detection
level
input
circuit
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
JP8660681A
Other languages
Japanese (ja)
Inventor
Fumiaki Suzuki
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
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP8660681A priority Critical patent/JPS57202162A/en
Publication of JPS57202162A publication Critical patent/JPS57202162A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H04L25/062—Setting decision thresholds using feedforward techniques only

Abstract

PURPOSE:To accurately perform a signal detection even if level fluctuation is great, by establishing a discrimination circuit which is not sensitive to an absolute level for noise level with and without input signals. CONSTITUTION:A reception input signal 101 is divided into two with a distributor 11; one signal 202 is delayed by a time ''T'' with a delay circuit 12, becomes a signal 204, is detected at the 1st detector 13 and applied to a holding circuit 15 as a signal 205. The said holding circuit 15 holds a detection signal 205 instantly when a discriminator 209 discriminates the presence of signal for the presence of signal and outputs the detection signal 205 as is as a reference signal 206 during the absence of signal. Thus, while the input signal 101 is absent, since the reference signal 206 is greater than a signal 208 by DELTAV, it is discriminated as the absence of signal. When the input signal 101 is presented, the detection signal 205 is delayed from a detection signal 207 by a time ''T'', then, the level difference between the signal 208 and the reference signal 206 is (S-DELTAV-N) and a discrimination circuit 17 discriminates the presence of signal.
JP8660681A 1981-06-05 1981-06-05 Signal detecting circuit Pending JPS57202162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8660681A JPS57202162A (en) 1981-06-05 1981-06-05 Signal detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8660681A JPS57202162A (en) 1981-06-05 1981-06-05 Signal detecting circuit

Publications (1)

Publication Number Publication Date
JPS57202162A true JPS57202162A (en) 1982-12-10

Family

ID=13891664

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8660681A Pending JPS57202162A (en) 1981-06-05 1981-06-05 Signal detecting circuit

Country Status (1)

Country Link
JP (1) JPS57202162A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60117399A (en) * 1983-11-29 1985-06-24 ホーチキ株式会社 Abnormality alarm
JPS62276694A (en) * 1987-05-18 1987-12-01 ホーチキ株式会社 Fire alarm

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5182506A (en) * 1975-01-17 1976-07-20 Kokusai Electric Co Ltd

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5182506A (en) * 1975-01-17 1976-07-20 Kokusai Electric Co Ltd

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60117399A (en) * 1983-11-29 1985-06-24 ホーチキ株式会社 Abnormality alarm
JPH0235359B2 (en) * 1983-11-29 1990-08-09 Hochiki Co
JPS62276694A (en) * 1987-05-18 1987-12-01 ホーチキ株式会社 Fire alarm
JPH0375919B2 (en) * 1987-05-18 1991-12-03 Hochiki Co

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