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JPS5444808A - Reception system for multi-frequency signal - Google Patents

Reception system for multi-frequency signal

Info

Publication number
JPS5444808A
JPS5444808A JP11059077A JP11059077A JPS5444808A JP S5444808 A JPS5444808 A JP S5444808A JP 11059077 A JP11059077 A JP 11059077A JP 11059077 A JP11059077 A JP 11059077A JP S5444808 A JPS5444808 A JP S5444808A
Authority
JP
Japan
Prior art keywords
amplitude
input signal
control part
signal
parameter
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.)
Granted
Application number
JP11059077A
Other languages
Japanese (ja)
Other versions
JPS576757B2 (en
Inventor
Akira Ichikawa
Kazuo Nakada
Kazuto Hirose
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP11059077A priority Critical patent/JPS5444808A/en
Priority to CA311,311A priority patent/CA1100641A/en
Priority to NL7809383A priority patent/NL7809383A/en
Priority to DE2840253A priority patent/DE2840253C2/en
Priority to US05/942,557 priority patent/US4211897A/en
Priority to GB7837013A priority patent/GB2006493B/en
Priority to FR7826598A priority patent/FR2403696B1/en
Publication of JPS5444808A publication Critical patent/JPS5444808A/en
Publication of JPS576757B2 publication Critical patent/JPS576757B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
    • H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To enable the efficient reception with a little malfunction by extracting signals whenever supervising and detecting the amplitude of an input signal. CONSTITUTION:A digitally-coded input is divided into two, which are transmitted to signal detection part 3 and k-parameter extraction part 4; and then, detection part 3 exercise the supervision over the amplitude of the input signal in order to discriminate that when the sum of the amplitude of data for, for instance, four milliseconds exceeds a fixed value, an input signal exists, thereby transmitting the signal to control part 1. Receiving this, control part 1 alternates switch 6 from contact (a) to (b) so that extraction part 4 will extract coefficients following the secondary (k1), and correlator 14 extracts the k-parameter from the correlation between backward and forward forecasted residual waves and outputs 21 it via control part 1. Consequently, the efficient reception with a little malfunction can be made.
JP11059077A 1977-09-16 1977-09-16 Reception system for multi-frequency signal Granted JPS5444808A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP11059077A JPS5444808A (en) 1977-09-16 1977-09-16 Reception system for multi-frequency signal
CA311,311A CA1100641A (en) 1977-09-16 1978-09-14 Multifrequency signal receiving system
NL7809383A NL7809383A (en) 1977-09-16 1978-09-14 RECEPTION SYSTEM FOR MULTIFREQUENCY SIGNALS.
DE2840253A DE2840253C2 (en) 1977-09-16 1978-09-15 Multi-frequency signal receiving system
US05/942,557 US4211897A (en) 1977-09-16 1978-09-15 Multifrequency signal receiving system
GB7837013A GB2006493B (en) 1977-09-16 1978-09-15 Multifrequency signal receiving system
FR7826598A FR2403696B1 (en) 1977-09-16 1978-09-15 MULTI-FREQUENCY SIGNAL RECEIVING SYSTEM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11059077A JPS5444808A (en) 1977-09-16 1977-09-16 Reception system for multi-frequency signal

Publications (2)

Publication Number Publication Date
JPS5444808A true JPS5444808A (en) 1979-04-09
JPS576757B2 JPS576757B2 (en) 1982-02-06

Family

ID=14539705

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11059077A Granted JPS5444808A (en) 1977-09-16 1977-09-16 Reception system for multi-frequency signal

Country Status (1)

Country Link
JP (1) JPS5444808A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS522312A (en) * 1975-06-23 1977-01-10 Ibm Signal detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS522312A (en) * 1975-06-23 1977-01-10 Ibm Signal detector

Also Published As

Publication number Publication date
JPS576757B2 (en) 1982-02-06

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