GB889136A - Improvements relating to frequency modulation receivers - Google Patents
Improvements relating to frequency modulation receiversInfo
- Publication number
- GB889136A GB889136A GB4244259A GB4244259A GB889136A GB 889136 A GB889136 A GB 889136A GB 4244259 A GB4244259 A GB 4244259A GB 4244259 A GB4244259 A GB 4244259A GB 889136 A GB889136 A GB 889136A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- tuned
- bias
- frequency
- subharmonic
- 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
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/06—Limiters of angle-modulated signals; such limiters combined with discriminators
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
889,136. Frequency changing. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Nov. 30, 1960 [Dec. 14, 1959], No. 42442/59. Drawings to Specification. Class 38 (2). [Also in Group XL (c)] An amplitude limiter and F.M. discriminator comprises a circuit tuned to a subharmonic of the input frequency and including a non-linear inductance or capacitance. The tuned circuit may form the collector circuit of a transistor with current adjustable to vary the magnetic bias of a ferrite toroidal core forming with a shunt capacitor the tuned circuit, this bias determining the input amplitude above which the output is substantially constant and below which is zero and being such that noise level in the absence of any signal input produces no output. The ferrite core may be link coupled in push-pull with a discriminator circuit resonant at the subharmonic of the incoming mean frequency, and capacitively coupled directly with the collector. In a modification, a non-linear ferro-electric or back-biased semiconductor diode shunted by an inductor forms the sub-harmonic tuned circuit and its bias adjusted from a potentiometer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4244259A GB889136A (en) | 1959-12-14 | 1959-12-14 | Improvements relating to frequency modulation receivers |
| FR846778A FR1275986A (en) | 1959-12-14 | 1960-12-13 | Improvements to frequency modulation receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4244259A GB889136A (en) | 1959-12-14 | 1959-12-14 | Improvements relating to frequency modulation receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB889136A true GB889136A (en) | 1962-02-07 |
Family
ID=10424436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4244259A Expired GB889136A (en) | 1959-12-14 | 1959-12-14 | Improvements relating to frequency modulation receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB889136A (en) |
-
1959
- 1959-12-14 GB GB4244259A patent/GB889136A/en not_active Expired
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