GB521490A - Improvements in and relating to noise limiting circuits for carrier wave communication systems - Google Patents

Improvements in and relating to noise limiting circuits for carrier wave communication systems

Info

Publication number
GB521490A
GB521490A GB2511438A GB2511438A GB521490A GB 521490 A GB521490 A GB 521490A GB 2511438 A GB2511438 A GB 2511438A GB 2511438 A GB2511438 A GB 2511438A GB 521490 A GB521490 A GB 521490A
Authority
GB
United Kingdom
Prior art keywords
output
diode
detector
demodulated
relating
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
Application number
GB2511438A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philco Radio and Television Corp
Original Assignee
Philco Radio and Television Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philco Radio and Television Corp filed Critical Philco Radio and Television Corp
Priority to GB2511438A priority Critical patent/GB521490A/en
Publication of GB521490A publication Critical patent/GB521490A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/04—Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated

Landscapes

  • Arrangements For Transmission Of Measured Signals (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

521,490. Wireless receiving circuits. THORNTON, A. A., (Philco Radio & Television Corporation). Aug. 26, 1938, No. 25114. [Class 40 (v)] The effect of static and like interference in a wireless receiver is limited by applying the demodulated output from a detector to a diode which is maintained conducting only for signal amplitudes below a predetermined value. A portion of the' modulated carrier from E is detected in the valve V1, the demodulated A.F. output across the load 9 being taken off through the diode 3. Diode 3 receives a positive bias from the output of detector V2, which is fed with the full voltage of source E, the lowfrequency output being removed by filter 12, 13. Thus when the degree of modulation rises above a value determined by the relative signal amplitude fed to V1 and V2, or when a noise impulse is received, the cathode of VI moves positively to an extent sufficient to render the diode 3 non-conducting, and the modulation frequency output is cut off. A variable bias on V1 obtained from a potentiometer 8 is employed to make the cathode potentials of V1 and V2 equal in the no-signal condition. The infinite impedance detectors V1, V2, may be replaced by diodes, Fig. 2 (not shown).
GB2511438A 1938-08-26 1938-08-26 Improvements in and relating to noise limiting circuits for carrier wave communication systems Expired GB521490A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2511438A GB521490A (en) 1938-08-26 1938-08-26 Improvements in and relating to noise limiting circuits for carrier wave communication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2511438A GB521490A (en) 1938-08-26 1938-08-26 Improvements in and relating to noise limiting circuits for carrier wave communication systems

Publications (1)

Publication Number Publication Date
GB521490A true GB521490A (en) 1940-05-23

Family

ID=10222431

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2511438A Expired GB521490A (en) 1938-08-26 1938-08-26 Improvements in and relating to noise limiting circuits for carrier wave communication systems

Country Status (1)

Country Link
GB (1) GB521490A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1152730B (en) * 1957-07-05 1963-08-14 Siemens Ag Circuit for limiting an electrical alternating voltage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1152730B (en) * 1957-07-05 1963-08-14 Siemens Ag Circuit for limiting an electrical alternating voltage

Similar Documents

Publication Publication Date Title
US2152515A (en) Automatic signal interference control
GB602846A (en) Improvements in frequency or phase modulation detectors
GB757968A (en) Phase comparator systems
US2304713A (en) Noise reduction in electric transmission systems
GB521490A (en) Improvements in and relating to noise limiting circuits for carrier wave communication systems
US2253338A (en) Modulated-carrier signal receiver
GB593361A (en) Improvements in or relating to super-generative receivers
GB606007A (en) Improvements in angle modulation detectors for carrier wave signalling
US2652488A (en) Squelch circuit
GB677506A (en) Improvements in pulse amplifiers
US2751493A (en) Noise squelch system
US2549825A (en) Receiver
US2501122A (en) Angle modulation receiver
US2972677A (en) Interference detecting circuit
GB682300A (en) Improvements in receivers for the simultaneous reception of two amplitude-modulated carrier waves
US2612602A (en) Noise suppression circuit
US2605395A (en) Noise suppression circuits
US2839675A (en) Attenuator of noise in radio sets
US2806136A (en) Controlled modulation circuit
GB753863A (en) Improvements in or relating to fmí¬am receiving circuit-arrangements
US3235812A (en) Apparatus for generating an electrical signal
US2512595A (en) Selective detector circuit
GB639183A (en) Improvements in and relating to noise suppression in radio receivers
GB611203A (en) Improvements in calling and noise suppression circuits for radio receivers
GB796082A (en) Improved a.m. or f.m. radio receiver detector circuit