JPS55151851A - Signal blocking device - Google Patents

Signal blocking device

Info

Publication number
JPS55151851A
JPS55151851A JP5974279A JP5974279A JPS55151851A JP S55151851 A JPS55151851 A JP S55151851A JP 5974279 A JP5974279 A JP 5974279A JP 5974279 A JP5974279 A JP 5974279A JP S55151851 A JPS55151851 A JP S55151851A
Authority
JP
Japan
Prior art keywords
signal
circuit
channel
tone signal
blocking
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
JP5974279A
Other languages
Japanese (ja)
Other versions
JPS5927554B2 (en
Inventor
Yoshikazu Ikeda
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to JP5974279A priority Critical patent/JPS5927554B2/en
Publication of JPS55151851A publication Critical patent/JPS55151851A/en
Publication of JPS5927554B2 publication Critical patent/JPS5927554B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To decrease the number of the signal blocking circuits and thus simplify the constitution of the talking circuit, by installing in common the signal blocking circuit which prevents the received tone signal from leaking out to the subsequent talking circuits and then inserting the blocking circuit only to the talking circuit that detected the tone signal.
CONSTITUTION: The PCM multiple signal sent from input terminal 21a is applied to signal detector 22 to detect the presence or absence of the tone signal. And in case the fact that the tone signal is received at a certain communication channel is detected, the blocking signal is applied to control unit 26 so that no tone signal of the channel may be delivered to the subsequent communication circuits. Then the channel number is sent to holding memory 27 from unit 26, and the control is given to AND gate 23a and gate circuit 23b from memory 27. At the same time, the signal of the channel is taken into input buffer 24a and then fitted to the channel which is used by digital filter 25 of the rear step. And the tone signal component is eliminated through filter 25 to be applied to circuit 23b, and the signal of the channel is delivered through output terminal 21b of circuit 23b.
COPYRIGHT: (C)1980,JPO&Japio
JP5974279A 1979-05-17 1979-05-17 signal blocking device Expired JPS5927554B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5974279A JPS5927554B2 (en) 1979-05-17 1979-05-17 signal blocking device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5974279A JPS5927554B2 (en) 1979-05-17 1979-05-17 signal blocking device

Publications (2)

Publication Number Publication Date
JPS55151851A true JPS55151851A (en) 1980-11-26
JPS5927554B2 JPS5927554B2 (en) 1984-07-06

Family

ID=13121975

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5974279A Expired JPS5927554B2 (en) 1979-05-17 1979-05-17 signal blocking device

Country Status (1)

Country Link
JP (1) JPS5927554B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61267771A (en) * 1985-05-22 1986-11-27 Fuji Xerox Co Ltd Developing device
JPS62135155U (en) * 1986-02-19 1987-08-25
JPS6319859U (en) * 1986-07-18 1988-02-09
JPS6339247U (en) * 1986-09-01 1988-03-14
JPH04133078A (en) * 1990-09-25 1992-05-07 Sumitomo Rubber Ind Ltd Seal for developing roller

Also Published As

Publication number Publication date
JPS5927554B2 (en) 1984-07-06

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