US1849632A - Volume control combining system - Google Patents

Volume control combining system Download PDF

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Publication number
US1849632A
US1849632A US319767A US31976728A US1849632A US 1849632 A US1849632 A US 1849632A US 319767 A US319767 A US 319767A US 31976728 A US31976728 A US 31976728A US 1849632 A US1849632 A US 1849632A
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US
United States
Prior art keywords
energies
energy
volume control
combined
amplifiers
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 - Lifetime
Application number
US319767A
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English (en)
Inventor
John B Moore
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.)
RCA Corp
Original Assignee
RCA 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
Priority to NL26641D priority Critical patent/NL26641C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US319767A priority patent/US1849632A/en
Priority to DER79797D priority patent/DE519147C/de
Priority to GB35260/29A priority patent/GB335443A/en
Application granted granted Critical
Publication of US1849632A publication Critical patent/US1849632A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0865—Independent weighting, i.e. weights based on own antenna reception parameters

Definitions

  • This invention relates to diversity reception, and more particularly to volume contro'l therefor.
  • the volume of the received energy 1s apt to vary between the extremes of almost complete fading at all of the antennas to no fading at any of the antennas.
  • To overcome this it has been proposed to equip the receivers for the antennas each with a volume control, but this, in additionto the requirement of a considerable number of volumecontrols, suffers from two great disadvantages.
  • the primary object of my invention which I attain by simultaneously controllingthe gain in the amplifiers of the separately collected energies all in response to the volume of the combined energy.
  • the amplifiers experience equal changes in gain, so that the energy from an antennaat which no fading is present retains itsv magnitude relative to the small energy at antennas lo- L e cated at fading points, and dominates such energy, thereby improving the quality of the combined energy.
  • my inventionv includes separately detecting the amplified "i energies, combining the detected energies so that the combination is substantially independent of the relative radio frequency phase atV the different antennas, and coni trolling the gain in the stepl of amplification of all of the collected energies in response to the volume of the combined detected energy,
  • each of these amplifiersY is coupled to means to heterodyne the radio frequency energy to energy of intermediate frequency, indicated by the rectangles 20, 22 and 24.
  • These means may comprise a source of locally generated energy of relatively high frequency and a separate heterodyne detector, or a single autodyne circuit in which the electron emission tube which functions as an oscillatoralso acts as a detector for combining the received and locally generated energies.
  • the resulting energy of intermediate frequency is amplified in intermediate frequency amplifiers 26, 28 and 30;
  • the amplified output is fed to detector tubes 32, 34 and 36, across the output circuit of each of which there is connected one or more low pass filter sections 38, 40 and 42, for by-passing the radio frequency components of the rectified energies.
  • rlhe signal components of the rectified energies are fed through leads 44, 46 and 48 ⁇ to a common lead 50, in series with which a source o firect sniple, by conn ec'tiiig tte coupling impedance
  • l clfiiin si l. 'E lie inetliod of eiversity r ception Wliicli 1 f includes siinultii'ieouslv meshing a plurelit f collections of relatively ⁇ linrncreristics, seperately 5l i: ciesii su rily Aceleeee energies, separately Y i i e die ainplifed energies producing control ini iedsnce :i la: d IES connected to unidiieetionel unduletory energy, b 1S mieli are DCifombining ⁇ the unidirectional energies, conn l trolling ⁇ the ⁇ okin in tlie aforesaid step of a1ntu s pliczition n. plurality of the collected enli li ergies in resp-e ise to the volume o1n the coino' biiied un
  • Tl e method of diversity reception ivliicli includes collecting ⁇ the redieted energy at e plurality oi spaced points, seperately enr provided iii pz pi yin' Jlie collected energies, seperately circuiteros ce i the eiiplilied energies to obtain inipedcnce 68 the in C; undulatory iiiiidir xctionzzl energy, combining tube 'TO coupled tlie detected un' 1'rectionnl energies, controlelectrode of' tlic i if li Aokn in the aforesaid step of ampliroin npo'eiitizi the liciition of a plurality of tlie collected enercoupling impei conn zgies in response to the volume of the comdenser 24.
  • Elie l'iined energy, end utilizinigT the combined uni- 70 may lie fu tional energy.
  • einplilier The inetliod et diversity reception Wliicli collectingl the radiated energy et zi lity of spaced poi its, separately empli- -ying and lieterodyniiig tlie collectede ergies to obtain :iinpliin ed energies of intermediate frequency, separately detecting the amplified eneigg'es to obtain unidirectional unfi ⁇ fitorj; energy, combining ⁇ the detected l.
  • rsity receiving system comprisplurality et antennas of different fadind of tie cori erecteristics, :i plurality of amplifiers tion circuit, me .ed thereto, ineens to seperately detect the amplified energies thereby obtaining uni* directional undulatory energies, means to combine the detected unidirectional undulatory energies, a common volume control responsive to the. combined undulatory energy for simultaneously controlling the gain in a plurality of the aforesaid amplifiers, and means to utilize the combined undulatory energy for translation.
  • a diversity receiving system comprising a plurality ofV spaced antennas, a plurality of amplifiers coupled thereto, means to separately detect the amplified energies to obtainV unidirectional undulatory energies, means to combine the detected unidirectional energies, a common volume control responsive to the combined energy for simultaneously controlling the gain in a plurality of the aforesaid amplifiers, and means to translate the combined unidirectional energy.
  • a diversity receiving system comprising a plurality of spaced antennas, a plurality of amplifiers and means to heterodyne the received energy to obtain amplified intermediate frequency energies coupled thereto, means to separately detect the amplified energies to obtain unidirectional undulatory energies, means to combine the Vdetected energies, a common volume control responsivevto the combined energy for simultaneously controlling the gain in each of theaforesaid amplifiers, and means to translate the combined unidirectional energy.
  • a diversity receiving system comprising a plurality of spaced antennas, a plurality of amplifiers coupled thereto, 'a plurality of d'etector tubes for detecting the amplified energies, a source of anode potential coupled to all of said detector tubes, a volume control impedance connected in series with said source of anode potential, a condenser cooperating with the impedance to establish the time constant of the volume control action, a connection from the volume control impedance to the control electrodes of the tubes of each of the aforesaid amplifiers for so varying the amplification gain therein as Will tend to keep the combined energy constant, a coupling impedance arranged in circuit with the volume control impedance to obtain a portion of the combined energy for utilization, an amplifier coupled to the coupling impedance, and a utilization circuit coupled to the amplifier.
  • a diversity receiving system comprising a plurality of spaced antennas, a plurality of amplifiers coupled thereto, means to separately heterodyne the received energies to obtain energies of intermediate frequency, means to separately amplify the intermediate frequency energies, a plurality of detector tubes for detecting the amplified energies, a source of anode potential coupled to all of said detector tubes, a volume control impedance connected in series With said source of anode potential, a condenser cooperating with ther impedance to establish the time constant of the volume control action, a connection from iso

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Radio Transmission System (AREA)
US319767A 1928-11-16 1928-11-16 Volume control combining system Expired - Lifetime US1849632A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL26641D NL26641C (fr) 1928-11-16
US319767A US1849632A (en) 1928-11-16 1928-11-16 Volume control combining system
DER79797D DE519147C (de) 1928-11-16 1929-11-14 Verfahren zur Verminderung der Schwunderscheinungen beim Empfang drahtloser Wellen
GB35260/29A GB335443A (en) 1928-11-16 1929-11-18 Improvements in or relating to radio receiving systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US319767A US1849632A (en) 1928-11-16 1928-11-16 Volume control combining system

Publications (1)

Publication Number Publication Date
US1849632A true US1849632A (en) 1932-03-15

Family

ID=23243560

Family Applications (1)

Application Number Title Priority Date Filing Date
US319767A Expired - Lifetime US1849632A (en) 1928-11-16 1928-11-16 Volume control combining system

Country Status (4)

Country Link
US (1) US1849632A (fr)
DE (1) DE519147C (fr)
GB (1) GB335443A (fr)
NL (1) NL26641C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423437A (en) * 1934-08-25 1947-07-08 Bell Telephone Labor Inc Direction finder
US2424972A (en) * 1945-04-02 1947-08-05 Standard Telephones Cables Ltd Transmitter control circuit
US2459259A (en) * 1943-10-25 1949-01-18 Rca Corp Diversity radio receiving system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423437A (en) * 1934-08-25 1947-07-08 Bell Telephone Labor Inc Direction finder
US2459259A (en) * 1943-10-25 1949-01-18 Rca Corp Diversity radio receiving system
US2424972A (en) * 1945-04-02 1947-08-05 Standard Telephones Cables Ltd Transmitter control circuit

Also Published As

Publication number Publication date
NL26641C (fr)
DE519147C (de) 1931-03-03
GB335443A (en) 1930-09-25

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