FR942664A - Improvements to the telephone communication system - Google Patents
Improvements to the telephone communication systemInfo
- Publication number
- FR942664A FR942664A FR942664DA FR942664A FR 942664 A FR942664 A FR 942664A FR 942664D A FR942664D A FR 942664DA FR 942664 A FR942664 A FR 942664A
- Authority
- FR
- France
- Prior art keywords
- communication system
- telephone communication
- telephone
- communication
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/62—Constructional arrangements
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Telephone Set Structure (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB730146A GB614638A (en) | 1946-03-08 | 1946-03-08 | Improvements in and relating to loudspeaking telephone systems |
Publications (1)
Publication Number | Publication Date |
---|---|
FR942664A true FR942664A (en) | 1949-02-15 |
Family
ID=9830490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR942664D Expired FR942664A (en) | 1946-03-08 | 1947-03-05 | Improvements to the telephone communication system |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE471744A (en) |
FR (1) | FR942664A (en) |
GB (1) | GB614638A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3102169A (en) * | 1959-12-14 | 1963-08-27 | Modern Telephones Great Britai | Loudspeaking telephones |
-
0
- BE BE471744D patent/BE471744A/xx unknown
-
1946
- 1946-03-08 GB GB730146A patent/GB614638A/en not_active Expired
-
1947
- 1947-03-05 FR FR942664D patent/FR942664A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB614638A (en) | 1948-12-20 |
BE471744A (en) |
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