JPS5237703A - Signal discrimination circuit - Google Patents

Signal discrimination circuit

Info

Publication number
JPS5237703A
JPS5237703A JP11396775A JP11396775A JPS5237703A JP S5237703 A JPS5237703 A JP S5237703A JP 11396775 A JP11396775 A JP 11396775A JP 11396775 A JP11396775 A JP 11396775A JP S5237703 A JPS5237703 A JP S5237703A
Authority
JP
Japan
Prior art keywords
discrimination circuit
signal discrimination
signal
discriminating
under
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
JP11396775A
Other languages
Japanese (ja)
Other versions
JPS607426B2 (en
Inventor
Mitsuo Kobanawa
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP11396775A priority Critical patent/JPS607426B2/en
Publication of JPS5237703A publication Critical patent/JPS5237703A/en
Publication of JPS607426B2 publication Critical patent/JPS607426B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • H04M1/654—Telephone line monitoring circuits therefor, e.g. ring detectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To obtain a signal discrimination circuit, which is capable of discriminating the aural signal from dial tone, under-talk sound or non-signal.
JP11396775A 1975-09-20 1975-09-20 answering machine Expired JPS607426B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11396775A JPS607426B2 (en) 1975-09-20 1975-09-20 answering machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11396775A JPS607426B2 (en) 1975-09-20 1975-09-20 answering machine

Publications (2)

Publication Number Publication Date
JPS5237703A true JPS5237703A (en) 1977-03-23
JPS607426B2 JPS607426B2 (en) 1985-02-25

Family

ID=14625685

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11396775A Expired JPS607426B2 (en) 1975-09-20 1975-09-20 answering machine

Country Status (1)

Country Link
JP (1) JPS607426B2 (en)

Also Published As

Publication number Publication date
JPS607426B2 (en) 1985-02-25

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