GB625067A - Improvements in or relating to call-signal reception in carrier-wave telephony systems - Google Patents
Improvements in or relating to call-signal reception in carrier-wave telephony systemsInfo
- Publication number
- GB625067A GB625067A GB34730/46A GB3473046A GB625067A GB 625067 A GB625067 A GB 625067A GB 34730/46 A GB34730/46 A GB 34730/46A GB 3473046 A GB3473046 A GB 3473046A GB 625067 A GB625067 A GB 625067A
- Authority
- GB
- United Kingdom
- Prior art keywords
- call
- carrier
- rectifiers
- bias
- oscillations
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
- H03C1/54—Balanced modulators, e.g. bridge type, ring type or double balanced type
- H03C1/56—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising variable two-pole elements only
- H03C1/58—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising variable two-pole elements only comprising diodes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/08—Arrangements for combining channels
- H04J1/085—Terminal station; Combined modulator and demodulator circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Transceivers (AREA)
Abstract
625,067. Radio signalling ; radio receiving systems ; diplex radio signalling. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Nov. 22, 1946, No. 34730. Convention date, June 12, 1943. [Class 40 (v)] In a signal receiver for carrier-wave telephony systems in which the carrier is suppressed during speech, but is used for transmitting the call signals, the call-signal oscillations Vp are applied in the same sense to the rectifiers of each of two oppositely connected pairs 4, Fig. 3, of biassed rectifiers while an auxiliary oscillation Vq of constant amplitude is applied in the opposite sense. By this arrangement the call signal oscillations are converted into output oscillations of reduced frequency and constant amplitude for ensuring reliable operation of the call relay. Instead of providing negative bias for the rectifiers, as shown in Fig. 3, the bias may be dependent upon the current flowing through the call relay 11, Fig. 6, the bias being derived from a resistance 15, 16 included in the anode circuit of an amplifying valve 10 following a detector 9 and filter 8.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL242056X | 1943-06-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB625067A true GB625067A (en) | 1949-06-21 |
Family
ID=19780619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34730/46A Expired GB625067A (en) | 1943-06-12 | 1946-11-22 | Improvements in or relating to call-signal reception in carrier-wave telephony systems |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE456250A (en) |
| CH (1) | CH242056A (en) |
| DE (1) | DE885725C (en) |
| FR (1) | FR904977A (en) |
| GB (1) | GB625067A (en) |
| NL (1) | NL70088C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1067105B (en) * | 1954-03-11 | 1959-10-15 |
-
0
- NL NL70088D patent/NL70088C/xx active
- BE BE456250D patent/BE456250A/xx unknown
-
1944
- 1944-06-09 DE DEN2337D patent/DE885725C/en not_active Expired
- 1944-06-10 FR FR904977D patent/FR904977A/en not_active Expired
- 1944-06-12 CH CH242056D patent/CH242056A/en unknown
-
1946
- 1946-11-22 GB GB34730/46A patent/GB625067A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE885725C (en) | 1953-08-06 |
| BE456250A (en) | |
| NL70088C (en) | |
| CH242056A (en) | 1946-04-15 |
| FR904977A (en) | 1945-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB920026A (en) | Improvements in or relating to radio transmission systems | |
| GB472586A (en) | Improvements in or relating to radio communication systems | |
| GB625067A (en) | Improvements in or relating to call-signal reception in carrier-wave telephony systems | |
| GB639926A (en) | Television receiver | |
| GB880673A (en) | Improvements in or relating to diversity radio receiving arrangements | |
| GB656189A (en) | Improvements in or relating to receiving circuits for telephony | |
| GB644989A (en) | Improvements in automatic gain control arrangements | |
| GB627579A (en) | Improvements in or relating to thermionic valve circuits | |
| GB661554A (en) | High frequency pre-emphasis for pulse code modulation | |
| GB958634A (en) | An ultra-short wave transmitter-receiver | |
| GB504711A (en) | Improvements in signal-receivers for carrier-telephony systems | |
| GB817713A (en) | Improvements relating to radio relays | |
| GB1030016A (en) | Improvements in or relating to systems for relaying radio signals | |
| GB636375A (en) | Improvements in or relating to circuits for receiving frequency-modulated oscillations | |
| GB847626A (en) | Improvements in or relating to single sideband equipment for speech transmission | |
| GB571580A (en) | Frequency modulation detector | |
| GB792350A (en) | Improvements in or relating to single-sideband radio receivers | |
| GB639686A (en) | Improvements relating to tuning means for mixed radio receivers adapted for amplitude modulation or frequency modulation | |
| GB952033A (en) | Improvements in transmission systems and transmitters and receivers therefor | |
| GB620010A (en) | ||
| GB613902A (en) | Improvements in and relating to repeater systems for high frequency electric waves | |
| GB595497A (en) | Improvements in frequency modulation receivers | |
| GB623668A (en) | Improvements in or relating to circuit-arrangements for limiting and detecting frequency-modulated oscillations | |
| GB578716A (en) | Improvements relating to wireless receiving apparatus | |
| GB616846A (en) | Improvements in or relating to superheterodyne receiving circuits |