GB344034A - Improvements in or relating to wireless receiving systems - Google Patents
Improvements in or relating to wireless receiving systemsInfo
- Publication number
- GB344034A GB344034A GB3653629A GB3653629A GB344034A GB 344034 A GB344034 A GB 344034A GB 3653629 A GB3653629 A GB 3653629A GB 3653629 A GB3653629 A GB 3653629A GB 344034 A GB344034 A GB 344034A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fed
- parallel
- output
- piezo
- valves
- 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
- 239000013078 crystal Substances 0.000 abstract 3
- 230000011664 signaling Effects 0.000 abstract 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000012216 screening Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/545—Filters comprising resonators of piezoelectric or electrostrictive material including active elements
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Transmitters (AREA)
Abstract
344,034. Valve amplifying circuits ; filter circuits. ROBINSON, J., 76, Mill Way, Mill Hill, London. Nov. 28, 1929, No. 36536. [Class 40 (v).] A selective system comprises two mechanical resonaters fed in parallel and having slightly different resonant frequencies the outputs being combined in opposite sense so that only the signalling frequency which is intermediate the two other frequencies appears in the output since this is oppositely phase displaced by the resonators. Fig. 1 shows a pair of valves 15, 17 having parallel outputs and fed by opposite phases from circuit 10 through piezo-electric crystals 14, 16. In a modification (Fig. 2, not shown) the valves have a push pull output and are fed in parallel through separate crystals. The piezo-electric crystals may form mechanical coupling devices as shown in Fig. 3 or may be replaced by tuning forks. To prevent interference the input of the forks may be electrostatic and the output electromagnetic and screening may be employed. Specifications 325,232, [Class 40 (v), Wireless signalling &c.], and 344,869 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3653629A GB344034A (en) | 1929-11-28 | 1929-11-28 | Improvements in or relating to wireless receiving systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3653629A GB344034A (en) | 1929-11-28 | 1929-11-28 | Improvements in or relating to wireless receiving systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB344034A true GB344034A (en) | 1931-03-02 |
Family
ID=10389048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3653629A Expired GB344034A (en) | 1929-11-28 | 1929-11-28 | Improvements in or relating to wireless receiving systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB344034A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE745757C (en) * | 1935-10-02 | 1944-05-22 | Hans Bodo Willers | Electromechanical impedance element with an oscillating element which extends essentially in one direction and which is tensioned and which is electrically excited from a circuit |
| DE755422C (en) * | 1950-10-24 | 1953-02-16 | Western Electric Co | Electric broadband wave filter in the form of a cross-link network with mechanically vibrating elements |
-
1929
- 1929-11-28 GB GB3653629A patent/GB344034A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE745757C (en) * | 1935-10-02 | 1944-05-22 | Hans Bodo Willers | Electromechanical impedance element with an oscillating element which extends essentially in one direction and which is tensioned and which is electrically excited from a circuit |
| DE755422C (en) * | 1950-10-24 | 1953-02-16 | Western Electric Co | Electric broadband wave filter in the form of a cross-link network with mechanically vibrating elements |
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