JPS55151851A - Signal blocking device - Google Patents
Signal blocking deviceInfo
- 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
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
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)
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 |
-
1979
- 1979-05-17 JP JP5974279A patent/JPS5927554B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5927554B2 (en) | 1984-07-06 |
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