JPS5487425A - Still-picture video telephone set - Google Patents
Still-picture video telephone setInfo
- Publication number
- JPS5487425A JPS5487425A JP15584277A JP15584277A JPS5487425A JP S5487425 A JPS5487425 A JP S5487425A JP 15584277 A JP15584277 A JP 15584277A JP 15584277 A JP15584277 A JP 15584277A JP S5487425 A JPS5487425 A JP S5487425A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- receiver
- discrimination
- existence
- still
- 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.)
- Pending
Links
Abstract
PURPOSE: To make it possible to transmit picture imformation by making use of the idle time of a general telephone circuit.
CONSTITUTION: As for the signal of voice handset 10A, transmitting signal level detector 14 detects its existence. When it exists, switches 13A and 13C are in states as shown in Fig. and the discrimination signal from discrimination signal generator 15 is band-superposed upon the transmitting signal of voice handset 10A and sent out to transmission line 17. When no signal exists, on the other hand, switches 13A and 13C are both switched to send out a signal from still picture transmitter-receiver 12, but no discrimination signal is sent out. At the reception side, discrimination signal receiver 16' detects the existence of the signal. In case of the existence of the discrimination signal, the signal from transmission line 17 is received by voice signal receiver 10B' and in case of no signal, on the other hand, a connection to the receiver circuit of still picture transmitter-receiver 12' is made and the regenerated picture appears on monitor 11b'.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15584277A JPS5487425A (en) | 1977-12-23 | 1977-12-23 | Still-picture video telephone set |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15584277A JPS5487425A (en) | 1977-12-23 | 1977-12-23 | Still-picture video telephone set |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5487425A true JPS5487425A (en) | 1979-07-11 |
Family
ID=15614678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15584277A Pending JPS5487425A (en) | 1977-12-23 | 1977-12-23 | Still-picture video telephone set |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5487425A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58131871A (en) * | 1982-01-30 | 1983-08-05 | Nec Corp | Still picture transmitter |
JPS63196188A (en) * | 1987-02-10 | 1988-08-15 | Sharp Corp | Signal transmitter |
-
1977
- 1977-12-23 JP JP15584277A patent/JPS5487425A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58131871A (en) * | 1982-01-30 | 1983-08-05 | Nec Corp | Still picture transmitter |
JPS63196188A (en) * | 1987-02-10 | 1988-08-15 | Sharp Corp | Signal transmitter |
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