GB492006A - Improvements in high frequency signalling systems - Google Patents
Improvements in high frequency signalling systemsInfo
- Publication number
- GB492006A GB492006A GB31893/37A GB3189337A GB492006A GB 492006 A GB492006 A GB 492006A GB 31893/37 A GB31893/37 A GB 31893/37A GB 3189337 A GB3189337 A GB 3189337A GB 492006 A GB492006 A GB 492006A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- speech
- cycles
- amplifier
- separated
- 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
Abstract
492,006. Automatic exchange systems. LORENZ AKT.-GES., C. Nov. 19, 1937, No. 31893. Convention date, Nov. 20, 1936. [Class 40 (iv)] [Also in Group XL] In a carrier current signalling system, speech and ringing signals are separated by transmitting speech on a modulation band of 300 to 2400 cycles, the carrier frequency fo being suppressed, and ringing signals on a modulation band of 0 to 300 cycles without suppression of the carrier frequency fo so that the two signals may be separated at the receiver by filters, one having a pass range of fo + 300 to fo + 2400 and the other a pass range of fo + 300. Carrier current from the generator 1 is modulated in the modulator 2 by speech currents from the device 3, and, after suppression of the carrier frequency in the modulator 2 or the filter 4, is fed to the line a, b over an amplifier 5. Ringing signals in the form of interruptions, e.g. dialling impulses, or unmodulated carrier current or of carrier current modulated with a continuous or interrupted audio-frequency of 0-300 cycles, are generated in the device 6 and fed to the line over the amplifier 5. After passing the amplifier 7, the received signals are separated by the filters 8 and 9 with passing ranges of fo+300 to fo+2400 and fo+300 respectively. The speech signals are demodulated in the device 10 and the calling signals are impressed upon a responsive device 11.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE492006X | 1936-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB492006A true GB492006A (en) | 1938-09-13 |
Family
ID=6544348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31893/37A Expired GB492006A (en) | 1936-11-20 | 1937-11-19 | Improvements in high frequency signalling systems |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2184826A (en) |
| FR (1) | FR829462A (en) |
| GB (1) | GB492006A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR965370A (en) * | 1947-04-29 | 1950-09-11 | ||
| NL185193B (en) * | 1953-02-18 | Arnold L & C | BED TABLE TOP FOR HOSPITAL NIGHT TABLES. | |
| NL107299C (en) * | 1959-12-24 | |||
| US3491207A (en) * | 1965-10-07 | 1970-01-20 | Superior Continental Corp | Subscriber's two-wire line including carrier telephone communication system |
-
1937
- 1937-11-13 US US174378A patent/US2184826A/en not_active Expired - Lifetime
- 1937-11-18 FR FR829462D patent/FR829462A/en not_active Expired
- 1937-11-19 GB GB31893/37A patent/GB492006A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2184826A (en) | 1939-12-26 |
| FR829462A (en) | 1938-06-28 |
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