US1917395A - Frequency determining means - Google Patents

Frequency determining means Download PDF

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Publication number
US1917395A
US1917395A US396895A US39689529A US1917395A US 1917395 A US1917395 A US 1917395A US 396895 A US396895 A US 396895A US 39689529 A US39689529 A US 39689529A US 1917395 A US1917395 A US 1917395A
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US
United States
Prior art keywords
frequency
carrier
tone
transformer
auxiliary
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
US396895A
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English (en)
Inventor
Runge Wilhelm
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US1917395A publication Critical patent/US1917395A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers
    • H04B1/302—Circuits for homodyne or synchrodyne receivers for single sideband receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/52—Automatic gain control

Definitions

  • a synchronizing frequency emitted by the transmitter serves to hold the boosted carrier on the correct frequency
  • the best known comprises the method of emitting jointly the remainder of a carrier, of workin it through the receiver individually and o settin it therein for heat reception with the booste carrier.
  • the frequency of the carrier booster is then to be set by hand or automatically in such a way that the beat note will have a itch as low as possible or that it will drop down to zero.
  • an auxiliary tone is emitted besides the voice which tone, being of a higher pitch than the highest voice frequencies emitted, is kept within the limits of constant intensity of sound by a process of automatically controlling the amplification to the effect that the slow hourly variations in the intensity of transmission are compensated.
  • this auxiliary tone is transmitted as the only frequency lying at the distance of its pitch at the side of the carrier suppressed.
  • the auxiliary tone After boosting with an artificial carrier and after demodulation the auxiliary tone will then reappear asan independent frequency. If, however, the boosted carrier varice from the suppressed carrier by n-cycles,
  • this auxiliary tone is use to synchronize the carrier booster.
  • the auxiliary tone for this purpose, is sent into a device which, for exam le, actuates a relay in such a way that the re ay is thrown to one side, in case the auxiliary tone has a lower pitch than its nominal frequency, whereas it is thrown to the opposite side, in case the auxiliary tone has a higher pitch than the nominal frequency.
  • the circuits closed by the relay contacts cause a detuning of the boosted carrier in such a way that the auxiliary tone is tuned up (adjusted) to its nominal frequency.
  • the auxiliary tone is made to synchronize with the suppressed carrier.
  • the regulation of the frequency of the auxiliar tone has to be so exact that the variations sti 1 existing between the boosted carrier and the suppressed one may not exceed the allowable limits.
  • the figure shows a diagrammatic sketch illustrating one embodiment of the invention.
  • the reception coming from the antennae 1 is amplified in the receiver 2, a side band and the carrier are eliminated in case those were emitted along.
  • a carrier corresponding to the suppressed carrier is boosted or restored again to the receiver 2 ahead of the rectifier or demodulator in the receiver.
  • the signals thus rectified are sent into two filter chains of which the filter chain 4 permits the voice frequencies to ass and conducts them further to the lines E while being impermeable to the frequencies of the auxiliary tone.
  • the filter chain 5 is only permeable to the auxiliary note but not to those of the voice, and furnishes, by way of transformers 6 and 7 auxiliary tone potential to the grids of two rectifiers 8 and 9 connected in counter-phase.
  • the secondary winding of transformer 6 is tuned to the normal frequency of the secondary tone by means of the condenser 10 and potential oscillations therein act in phase opposition upon the grids of the tubes 8 and 9.
  • the transformer 7 is not tuned and the potential oscillations in the secondary winding thereof energizes both grids in equal phase, since this winding is connected at one end to the filaments of 8 and 9 and at the other end to the midpoint of the secondar winding of transformer 6.
  • the potentia s impressed upon the grids by the transformers 6 and 7 are in phase quadrature to each other when the auxiliary tone is in synchronism with the frequency to which the secondary side of the transformer 6 is tuned by the condenser 10.
  • the anode currents of both tubes 8 and 9 are equal to each other, the relay 11 is not energized. If, however, the auxiliary tone frequency 6 varies from the resonance frequency to which the secondary side of the transformer 6 is tuned in that case the potentials, at the terminals of the transformer 6 are not out of phase by ninety degrees to those at the transformer 7. In consequence thereof the one id will receive a higher alternating potential than the other grid.
  • the rectified currents of the tubes 8 and 9 are therefore of different magnitude and the rela 11 will be thrown to the one side or the other according to the direction in which the frequency of the auxiliar tone has shifted.
  • the relay When, according to t e connection illustrated, the relay is thrown in one direction the grid of the tube 12 is charged positive by an auxiliary battery 13, whereas the latter is charged negative when the relay is thrown in the opposite direction.
  • the resistance 14 and the condenser 15 introduce a time lag in the potentials applied to the grid of 12 and varies slowl the potential of the grid of 12 after the grid relay has been actuated.
  • the anode direct current of the tube 12, thus varied, is fed a ain to the carrier boosting device and by shifting of the carrier boosting frequency to this extent causes correction of CERTIFICATE OF Patent No. 1, 917,395.
  • a receiver including a detector, a filter to the super-audible frequency connected to said detector, thermionic means for producing potential variations representative of variations in the frequency of the super-audible frequency, a high frequency generator connected with said receiver, and means for utilizing the potential variations representative of changes in the super-aud1ble frequency for controlling said high frequency generator.
  • a radio receiver including, a rectifier, means for filtering out the signal fr uency connected with said rectifier, an oscillation generator connected with said receiver, means for filtering out the control frequency, a pair of thermionic tubes having input and output electrodes connected in opposition, means for difl'erentially coupling the input circuit of said thermionic tubes to the output circuit of said control frequency filter, means for cumulatively connecting the input circuit of said thermionic tubes to the output circuit of said control frequency, a thermionic amplifier having its input circuits adapted to be connected alternately to the terminals of a biasing source by means of a rela connected with the output circuit of said fi rst named thermionic tubes and a connection between the output electrodes of said thermionic amplifier and said high frequency generator.
  • the auxiliary tone frequency 6 varies from the resonance frequency to which the secondary side of the transformer 6 is tuned in that case the potentials, at the terminals of the transformer 6 are not out of phase by ninety degrees to those at the transformer 7. In consequence thereof the one id will receive a higher alternating potential than the other grid.
  • the rectified currents of the tubes 8 and 9 are therefore of different magnitude and the rela 11 will be thrown to the one side or the other according to the direction in which the frequency of the auxiliar tone has shifted.
  • the relay When, according to t e connection illustrated, the relay is thrown in one direction the grid of the tube 12 is charged positive by an auxiliary battery 13, whereas the latter is charged negative when the relay is thrown in the opposite direction.
  • the resistance 14 and the condenser 15 introduce a time lag in the potentials applied to the grid of 12 and varies slowl the potential of the grid of 12 after the grid relay has been actuated.
  • the anode direct current of the tube 12, thus varied, is fed a ain to the carrier boosting device and by shifting of the carrier boosting frequency to this extent causes correction of the variation of the auxiliary tone from the nominal frequency.
  • a receiver including a detector, a filter to the super-audible frequency connected to said detector, thermionic means for producing potential variations representative of variations in the frequency of the super-audible frequency, a high frequency generator connected with said receiver, and means for utilizing the potential variations representative of changes in the super-aud1ble frequency for controlling said high frequency generator.
  • a radio receiver including, a rectifier, means for filtering out the signal fr uency connected with said rectifier, an oscillation generator connected with said receiver, means for filtering out the control frequency, a pair of thermionic tubes having input and output electrodes connected in opposition, means for difl'erentially coupling the input circuit of said thermionic tubes to the output circuit of said control frequency filter, means for cumulatively connecting the input circuit of said thermionic tubes to the output circuit of said control frequency, a thermionic amplifier having its input circuits adapted to be connected alternately to the terminals of a biasing source by means of a rela connected with the output circuit of said fi rst named thermionic tubes and a connection between the output electrodes of said thermionic amplifier and said high frequency generator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Radio Relay Systems (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Superheterodyne Receivers (AREA)
US396895A 1928-10-16 1929-10-02 Frequency determining means Expired - Lifetime US1917395A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DET35820D DE509946C (de) 1928-10-16 1928-10-16 Empfangsanordnung mit Traegerwellenzusatz vermittels eines in der Frequenz automatisch geregelten lokalen Generators
DE341766X 1929-03-08

Publications (1)

Publication Number Publication Date
US1917395A true US1917395A (en) 1933-07-11

Family

ID=25821141

Family Applications (1)

Application Number Title Priority Date Filing Date
US396895A Expired - Lifetime US1917395A (en) 1928-10-16 1929-10-02 Frequency determining means

Country Status (4)

Country Link
US (1) US1917395A (enrdf_load_stackoverflow)
DE (1) DE509946C (enrdf_load_stackoverflow)
FR (2) FR683292A (enrdf_load_stackoverflow)
GB (2) GB332834A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2462630A (en) * 1945-02-28 1949-02-22 Honeywell Regulator Co Phase-sensitive self-balancing frequency meter
US2871349A (en) * 1954-07-14 1959-01-27 Jonas M Shapiro Discriminator circuit
US3101448A (en) * 1954-12-23 1963-08-20 Gen Electric Synchronous detector system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE872969C (de) * 1951-01-13 1953-04-09 Siemens Ag Verfahren zur Schwundminderung bei drahtlosen Einseitenband-UEbertragungen
FR2526554B1 (fr) * 1982-05-06 1985-06-07 Telecommunications Sa Procede de regulation de moyens emetteurs d'informations lumineuses et le systeme de mise en oeuvre

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2462630A (en) * 1945-02-28 1949-02-22 Honeywell Regulator Co Phase-sensitive self-balancing frequency meter
US2871349A (en) * 1954-07-14 1959-01-27 Jonas M Shapiro Discriminator circuit
US3101448A (en) * 1954-12-23 1963-08-20 Gen Electric Synchronous detector system

Also Published As

Publication number Publication date
GB332834A (enrdf_load_stackoverflow) 1930-07-31
GB341766A (en) 1931-01-22
FR37916E (fr) 1931-02-07
FR683292A (fr) 1930-06-10
DE509946C (de) 1930-10-14

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