GB514362A - Improvements in multiplex-telephony and the like - Google Patents
Improvements in multiplex-telephony and the likeInfo
- Publication number
- GB514362A GB514362A GB2979/38A GB297938A GB514362A GB 514362 A GB514362 A GB 514362A GB 2979/38 A GB2979/38 A GB 2979/38A GB 297938 A GB297938 A GB 297938A GB 514362 A GB514362 A GB 514362A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequencies
- multiplex
- telephony
- bands
- signals
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/14—Arrangements providing for calling or supervisory signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
514,362. Multiplex systems. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Jan. 31, 1938, No. 2979. Void. Convention date, Feb. 3, 1937. Drawings to Specification. [Class 40 (iv)] In a multiplex carrier system, the ringing and other control signals are transmitted at frequencies which are unsuitable or inferior for the transmission of telephony. Such frequencies may lie at the upper and lower edges of a broad band system, between the two bands constituting go and return channels or within the range of the suppressed side-bands. The signals may be emitted at the desired frequencies or may modulate carrier frequencies either individually or in groups.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL514362X | 1937-02-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB514362A true GB514362A (en) | 1939-11-06 |
Family
ID=19786941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2979/38A Expired GB514362A (en) | 1937-02-03 | 1938-01-31 | Improvements in multiplex-telephony and the like |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE426131A (en) |
| FR (1) | FR833013A (en) |
| GB (1) | GB514362A (en) |
-
0
- BE BE426131D patent/BE426131A/xx unknown
-
1938
- 1938-01-31 GB GB2979/38A patent/GB514362A/en not_active Expired
- 1938-02-01 FR FR833013D patent/FR833013A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR833013A (en) | 1938-10-10 |
| BE426131A (en) |
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