GB640015A - Improvements in and relating to apparatus for compressing or expanding the frequencybands of electric oscillations - Google Patents
Improvements in and relating to apparatus for compressing or expanding the frequencybands of electric oscillationsInfo
- Publication number
- GB640015A GB640015A GB14934/47A GB1493447A GB640015A GB 640015 A GB640015 A GB 640015A GB 14934/47 A GB14934/47 A GB 14934/47A GB 1493447 A GB1493447 A GB 1493447A GB 640015 A GB640015 A GB 640015A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- delay
- output
- lines
- compressing
- 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
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/30—Time-delay networks
- H03H7/34—Time-delay networks with lumped and distributed reactance
Landscapes
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
640,015. Band-width compression. BRITISH TELECOMMUNICATIONS RESEARCH, Ltd. and BELL, D. A. June 5, 1947, No. 14934. [Class 40 (iv)] [Also in Group XL (b)] In an arrangement for compressing or expanding the frequency range of a signal the wave form of the signal moving along the delay line 3 at one speed is scanned by a succession of pulses moving along a second delay line 4 at a different speed. As shown in Fig. 1 each delay line is divided into sections of equal time delay, different for the two lines, the output from the sections of the line 3 being fed to the output circuit 8 via a succession of gates 7 which are opened in turn as the pulse in travelling along the line 4 reaches the end of each section thereof. To avoid undesirable change-over effects at the ends of the delay lines, attenuations may be inserted between the gates 7 and the output circuit 8, the loss introduced being greatest at the ends of the line. In a modification, Fig. 3, the delay lines are continuously loaded and in contact along the whole of their lengths with a block 26 of material having a non-linear voltage/current characteristic, the output being collected from spaced conductors 27, 28 therein. The cross-section of the block is reduced at its ends in order to produce the required attenuation of the output at these points.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB14934/47A GB640015A (en) | 1947-06-05 | 1947-06-05 | Improvements in and relating to apparatus for compressing or expanding the frequencybands of electric oscillations |
| US31294A US2545871A (en) | 1947-06-05 | 1948-06-05 | Apparatus for compressing or expanding the frequency bands of electric oscillations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB14934/47A GB640015A (en) | 1947-06-05 | 1947-06-05 | Improvements in and relating to apparatus for compressing or expanding the frequencybands of electric oscillations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB640015A true GB640015A (en) | 1950-07-12 |
Family
ID=10050119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14934/47A Expired GB640015A (en) | 1947-06-05 | 1947-06-05 | Improvements in and relating to apparatus for compressing or expanding the frequencybands of electric oscillations |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2545871A (en) |
| GB (1) | GB640015A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2976492A (en) * | 1961-03-21 | Solid state maser | ||
| US2790956A (en) * | 1953-07-09 | 1957-04-30 | Bell Telephone Labor Inc | Distortion corrector |
| US2923882A (en) * | 1955-11-14 | 1960-02-02 | Henry K Bradford | Signalling apparatus |
| US2958039A (en) * | 1956-05-18 | 1960-10-25 | Univ California | Delay line time compressor |
| US2923891A (en) * | 1956-06-11 | 1960-02-02 | Decade | |
| FR1401152A (en) * | 1960-03-02 | 1965-06-04 | Telecommunications Sa | Receiver adapted to improved noise figure for telecommunication link |
| US3209263A (en) * | 1962-04-02 | 1965-09-28 | Philco Corp | Bandwidth changing means for electrical signals |
| US3386052A (en) * | 1964-11-05 | 1968-05-28 | Westinghouse Electric Corp | Wide band distributed phase modulator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1671143A (en) * | 1924-09-24 | 1928-05-29 | American Telephone & Telegraph | Wave translator |
| GB470495A (en) * | 1935-11-14 | 1937-08-16 | Alan Dower Blumlein | Improvements in or relating to multiplex signalling systems |
| GB577275A (en) * | 1939-11-30 | 1946-05-13 | William Spencer Percival | Improvements in or relating to methods and apparatus for reducing the effect of interference in the observation of signals |
-
1947
- 1947-06-05 GB GB14934/47A patent/GB640015A/en not_active Expired
-
1948
- 1948-06-05 US US31294A patent/US2545871A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2545871A (en) | 1951-03-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB709509A (en) | Band pass electric filters | |
| GB761778A (en) | Microwave filters | |
| GB641279A (en) | Improvements in or relating to circuit-arrangements for influencing electrically thepropagation constant of a network | |
| ES412856A1 (en) | Microstrip filter | |
| GB712306A (en) | Microwave filters | |
| GB640015A (en) | Improvements in and relating to apparatus for compressing or expanding the frequencybands of electric oscillations | |
| US3530302A (en) | Method of and apparatus for changing frequency power and/or delay time of wave energy | |
| ES422597A1 (en) | Method and apparatus for amplifying signal transmission through transmission lines | |
| ES371269A1 (en) | Methods of and apparatus for manufacturing improved high-frequency cables | |
| US2863126A (en) | Tapered wave guide delay equalizer | |
| GB918419A (en) | Improvements in or relating to transmission line coupling arrangements | |
| GB999545A (en) | Symmetrical high frequency line | |
| GB683273A (en) | Improvements in or relating to electrical impedance transformers for use at very high frequencies | |
| GB650337A (en) | Improvements in or relating to high frequency electric heating apparatus | |
| GB567731A (en) | Improvements in or relating to heating materials by high frequency electric currents | |
| GB661056A (en) | An electrical system including a ceramic body | |
| JPS54103655A (en) | Microwave band pass filter | |
| GB646545A (en) | Improvements in or relating to electromagnetic waveguides | |
| GB994507A (en) | Improvements in or relating to electron beam tubes | |
| GB664689A (en) | Improvements in or relating to wave guide junctions for ultra-high frequency electromagnetic waves | |
| GB1471793A (en) | Microwave pulse attenuator | |
| GB1129185A (en) | Improvements in or relating to waveguide filters | |
| GB706824A (en) | Improvements in or relating to electrical wave-guide systems for producing a phase difference between two output waves | |
| GB667657A (en) | Improvements in or relating to high frequency heating systems | |
| FR2302632A1 (en) | Electric cyclic switch for signals channels selection - has ten input channels and two output channels with variable duration of connection |