JPS5763964A - Aural switch circuit - Google Patents

Aural switch circuit

Info

Publication number
JPS5763964A
JPS5763964A JP55138268A JP13826880A JPS5763964A JP S5763964 A JPS5763964 A JP S5763964A JP 55138268 A JP55138268 A JP 55138268A JP 13826880 A JP13826880 A JP 13826880A JP S5763964 A JPS5763964 A JP S5763964A
Authority
JP
Japan
Prior art keywords
aural
level
input signal
sending
state
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
JP55138268A
Other languages
Japanese (ja)
Other versions
JPS6132853B2 (en
Inventor
Tetsuo Ishizaka
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 JP55138268A priority Critical patent/JPS5763964A/en
Publication of JPS5763964A publication Critical patent/JPS5763964A/en
Publication of JPS6132853B2 publication Critical patent/JPS6132853B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency

Abstract

PURPOSE:To prevent not only the malfunction due to the noise but the lowering of the talking quality due to the switching for an aural switch circuit that inserts and eliminates the loss, by having the comparison among the sending speed aural signal level, the receiving speed signal level and the noise level respectively. CONSTITUTION:The aural signal level of the sending speed input signal is compered with the noise level through the 1st comparator 8. Then the 1st inspecting circuit 11 delivers continuously the netative voltage although the noise level is temporarily higher than the aural level. Thus the under-talking state can be maintained. Furthermore at the receiver side, the receiving speech input signal is received and compared with the sending speech input signal level. Then the sending speech state is indicated in case when the negative potential is consecutively secured. The negative potential is delivered for a certain period of time from the moment when the result of comparison is changed to the intermediate potential from the negative potential. As a result, the state of transmission can be maintained for a certain period of time although the sending speed input signal is broken in a short time. The receiving speed state is quickly obtained when the result of comparison is set at the positive voltage.
JP55138268A 1980-10-04 1980-10-04 Aural switch circuit Granted JPS5763964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55138268A JPS5763964A (en) 1980-10-04 1980-10-04 Aural switch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55138268A JPS5763964A (en) 1980-10-04 1980-10-04 Aural switch circuit

Publications (2)

Publication Number Publication Date
JPS5763964A true JPS5763964A (en) 1982-04-17
JPS6132853B2 JPS6132853B2 (en) 1986-07-30

Family

ID=15217951

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55138268A Granted JPS5763964A (en) 1980-10-04 1980-10-04 Aural switch circuit

Country Status (1)

Country Link
JP (1) JPS5763964A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6275652U (en) * 1985-10-31 1987-05-14
JPH02183657A (en) * 1989-01-10 1990-07-18 Hitachi Ltd Communication control system for elevator communication equipment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01182654A (en) * 1988-01-12 1989-07-20 Ulvac Corp Rotation transmission device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6275652U (en) * 1985-10-31 1987-05-14
JPH02183657A (en) * 1989-01-10 1990-07-18 Hitachi Ltd Communication control system for elevator communication equipment

Also Published As

Publication number Publication date
JPS6132853B2 (en) 1986-07-30

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