JPS5034404A - - Google Patents
Info
- Publication number
- JPS5034404A JPS5034404A JP7377474A JP7377474A JPS5034404A JP S5034404 A JPS5034404 A JP S5034404A JP 7377474 A JP7377474 A JP 7377474A JP 7377474 A JP7377474 A JP 7377474A JP S5034404 A JPS5034404 A JP S5034404A
- Authority
- JP
- Japan
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/016—Personal emergency signalling and security systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Alarm Devices (AREA)
- Circuit For Audible Band Transducer (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7323590A FR2235442A1 (en) | 1973-06-27 | 1973-06-27 | Remote acoustic monitor for work stations - selective amplification of microphone signals ensures noise immunity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5034404A true JPS5034404A (en, 2012) | 1975-04-02 |
Family
ID=9121681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7377474A Pending JPS5034404A (en, 2012) | 1973-06-27 | 1974-06-27 |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5034404A (en, 2012) |
| DE (1) | DE2430745A1 (en, 2012) |
| FR (1) | FR2235442A1 (en, 2012) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5345008U (en, 2012) * | 1976-09-20 | 1978-04-17 |
-
1973
- 1973-06-27 FR FR7323590A patent/FR2235442A1/fr active Granted
-
1974
- 1974-06-26 DE DE19742430745 patent/DE2430745A1/de not_active Withdrawn
- 1974-06-27 JP JP7377474A patent/JPS5034404A/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5345008U (en, 2012) * | 1976-09-20 | 1978-04-17 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2235442B1 (en, 2012) | 1977-05-13 |
| FR2235442A1 (en) | 1975-01-24 |
| DE2430745A1 (de) | 1975-01-23 |