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US1330471A - High-frequency signaling - Google Patents

High-frequency signaling Download PDF

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Publication number
US1330471A
US1330471A US64005A US6400515A US1330471A US 1330471 A US1330471 A US 1330471A US 64005 A US64005 A US 64005A US 6400515 A US6400515 A US 6400515A US 1330471 A US1330471 A US 1330471A
Authority
US
United States
Prior art keywords
oscillations
circuit
frequency
modulated
carrier
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
US64005A
Other languages
English (en)
Inventor
Burton W Kendall
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 NL5069D priority Critical patent/NL5069C/xx
Priority to NL5239D priority patent/NL5239C/xx
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to US64005A priority patent/US1330471A/en
Priority to US64524A priority patent/US1449382A/en
Priority to GB17003/16A priority patent/GB102500A/en
Priority to GB17170/16A priority patent/GB102503A/en
Priority to FR519170A priority patent/FR519170A/fr
Priority to DE1917C0026645 priority patent/DE361966C/de
Priority to FR22856A priority patent/FR22856E/fr
Priority to FR22858A priority patent/FR22858E/fr
Priority to NL8910A priority patent/NL5426C/xx
Priority to FR22863A priority patent/FR22863E/fr
Application granted granted Critical
Publication of US1330471A publication Critical patent/US1330471A/en
Priority to US368881A priority patent/US1548267A/en
Priority to FR27272D priority patent/FR27272E/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • 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
    • H04B1/68—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 for wholly or partially suppressing the carrier or one side band

Definitions

  • This invention relates to a method and cation, with small regard for the distortion produced.
  • the method .of intensification which is here shown depends upon the local generation of oscillations at the receiving station, which oscillations are combined with the received oscillations to produce a much stronger effect in the indicator than would be produced by the received oscillations alone.
  • a method of wireless telegraph reception which hasnow becomewell known in-the art, i the heterodyn'e method, which consists essentially in receiving the weak signal oscillations and combining them generated oscillations ofa slightly different frequency.
  • the pitch of this note depends in no way on the form of the transmitted wave. but only on the difference in frequency between the transn'ntted high the extraordinary that the distorany desired frequency, preferably with locally I that of the locally generated 'a plate 32, all suitably evacuated vessel 33.
  • the input cirfrequency oscillations and the locally generated oscillations are of a frequency equal to between the frequency ofthe received and oscillations. Thi difference is adjusted to be within the audible limit, and a note corresponding to this beat frequency is heard in the receiver.
  • the pitch of this note
  • each of the figures 10 represents a receiving antenna of the usual type employed, in wireless signaling.
  • This antenna is connected to ground at 11, and between the antenna and the ground connection are placed ductance 12 and condenser 13, by means of which the receiving system may be tuned to a suitable variable 1n-' the fre- 3 shows a circuit and Fig. 4 v
  • This condenser may a very high non-inductive resistance or may be omitted entirely.
  • Fig. 1 is a tuned circuit consisting of theinductance 20 and the condenser 21.
  • a detector Connected in shunt to the condenser21 is a detector, and there is, in this case, shown a detector of the audion type which comprises the usnalheated filament 30, a grid 31 and these being contained in a cuit of this detector comprises the filament 30 and the grid 31, and these are connected in shunt, as mentioned above, to the conbe shunted v Inductively associated with the antenna denser 21.
  • the output circuit includes the filament 30 and the plate 32 and contains in series a suitable source of electrical energy 35, and a telephone receiver 36.
  • this system is adapted to receive modulated oscillations and to translate them into audible signals in the receiver 36.
  • the intensity of these is adapted to receive modulated oscillations and to translate them into audible signals in the receiver 36. The intensity of these.
  • acrystal rectifier such as acrystal rectifier, may be used although a detector of the form shown is pre ferred.
  • the locally generated oscillations may be set up by an independent generatorof any type, such as shown at '40, one may make use of that property of famplifiers and repeaters by virtue of which they mayv act as generators of oscillations in themselves.
  • Such a-circuitis shown in-Fig. 2 in which a coupling between the input circuit and the output circuit of this thermionic device is obtained by connecting the filament to some intermediate point 50 of the inductance 20. In this case, as is described in application of Hartley, Serial No.
  • a circuit arranged amplifying circuit comprising the tuned “circuit 60, 61', connected to the input circuit of a thermionic amplifier of the audion type, this input circuit including the usual heated filament 62 and grid 63, and the out- 5 put circuit including the filament 62 and the plate 64; in series with a power "battery 65 and an inductance 66.
  • the usual battery 68 for polarizing the grid may also be used.
  • Inductively connected to the inductance 66 1s a detecting circuit, such as circuit D of Fig. 3.-
  • This circuit D has a circuit 20, 21 tuned to the carrier frequency and inductively coupled to inductance 66.
  • In shunt to the condenser 21 isadetecting and generating thermionic device 33, similar in every respect to the one described in Fig.
  • the outputcircuit of this thermionic device 33 contains the power battery 35 and 1 the telephone receiver 36, said receiver being shunted by the condenser 39. In series with this output circuit is also included the inductance 70 which is coupled to the coil 20, thereby arranging for the feed-back of power from the output to the input circuit,
  • the non-inductive resistance 84 In series with the coil- 83 is the non-inductive resistance 84. In shunt to a part of the resistance 8% is the input circuit of a thermionic amplifier 85 comprising the usual heated filament 86 and grid 87.
  • the output circuit comprises the filament 86 andv the plate 88, as well as the power battery 89 and the primary 90 of a transformer 91.
  • This transformer is a telephone repeating coil.
  • the secondary of this repeating coil is connected to the telephone receiver 92 or to any telephone line for further transmission to remotestations. It may be advantageous to place the polarizing battery 98 in the grid circuit of the amplifier to maintain the grid at a proper potential with respect to the filament.
  • the transformer 82, 83 shall be adapted to work between circuits of high impedance, and that the resistances 80 and 8f shall be large.
  • the resistances 80 and 84 may be of the order of one hundred thousand ohms.
  • the circuit E is used solely for amplifying the received hi h frequency oscillations, while the circuit F is used for combining these amplified oscillations with locally generated oscillations of the carrier frequency.
  • the feed-back coil 67 isso connected with respect to the coil 60 as to prevent sinnin in the same manner as for this coil 67 in Fig. 3.
  • Tl-16 method of" wireless telephony' which consists in radiating modulated high frequency oscillations, in receiving said oscillations and combining them with locally generated high frequency oscillationsof the same frequency as and of constant amplitude.
  • a generator'of oscillationsof the carrier frea generator of oscillations of the carrier fredetector a circuit to'impress the received oscillations and the locally gen-. euated oscillations upon the inputcircuit of tlie detector, and a translating device associated with the output circuit of the detector.
  • a high frequency telephone receiving system comprising an antenna adapted to receive high frequency'carrler Waves modulated in accordance with speech, a detector
  • a high frequency telephone receiving system comprising an antenna adapted to receive high frequency carrier Waves modulated in-accordance With speech, a thermionic detector of the audion type, a tuned circuit inductively connected to said antenna and connectedto the input circuit of said detector, a generator of oscillations of the car-v rier frequency, means forimpressing said locally generated oscillations upon the, input modulated in accordance with speech, and
  • a telephene receiver associated with the output circuit of said detector.
  • a telephone-receiver associated .withthe output circuit of said thermionic device.
  • a system for detecting modulated carrier oscillations comprising an electric discharge device having an an: 'ode,'a cathode, and anjmipedance-controloscillations; P
  • a signal receiving system comprising an electr1c discharge device having a cathode, an anode, an impedance-varying elemerit, an input circuit and an output circuit,
  • a receiving system comprising .a detector, means for impressing upon the input circuit of said detector carrier oscillations means associated modulated in accordance with a relatively low frequency wave, a local generator of oscillations of-the carrier frequency, means for" impressing upon said detector the locally-generated oscillations and the modulated oscillations, and a translating device associated with the output circuit of said detector for receiving and utilizing the detected oscillation-s.
  • a receiving system comprising'means .for amplifying weak oscillations, means for impressing the-received oscillations modulated in accordance with a low frequency wave upon said amplifying means, a local generator of oscillations of the frequency ofsaid modulated oscillations, translating means for obtaining low frequency waves from oscillations modulated in accordance with waves of said low frequency, and means for impressing said received modulated oscillations and said locally-generated oscillation-s simultaneously -upon said translating means.
  • a telephone receiving system comprising means for amplifying weak oscillations, means for impressing received oscillations modulated in accordance with speech upon said amplifying means, a local generator of oscillations of the frequency of" said received oscillations, translating means for obtainng low frequency waves from oscillations modulated in accordance with waves" of said low frequency, and means for impressing said received oscillations and said) locallyrgenerated oscillations simultaneously upon said translating means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)
US64005A 1915-11-29 1915-11-29 High-frequency signaling Expired - Lifetime US1330471A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
NL5069D NL5069C (fr) 1915-11-29
NL5239D NL5239C (fr) 1915-11-29
US64005A US1330471A (en) 1915-11-29 1915-11-29 High-frequency signaling
US64524A US1449382A (en) 1915-11-29 1915-12-01 Method and means for signaling with high-frequency waves
GB17003/16A GB102500A (en) 1915-11-29 1916-11-27 Improvements in High Frequency Signalling, particularly applicable to wireless telephony.
GB17170/16A GB102503A (en) 1915-11-29 1916-11-30 Improvements in High Frequency Signalling, particularly applicable to wireless Telephony.
FR519170A FR519170A (fr) 1915-11-29 1917-03-17 Système de signalisation électrique
DE1917C0026645 DE361966C (de) 1915-11-29 1917-03-22 Verfahren und Anordnung zur UEbertragung von Toenen vermittels elektrischer Wellen
FR22856A FR22856E (fr) 1915-11-29 1917-06-07 Système de signalisation électrique
FR22858A FR22858E (fr) 1915-11-29 1917-10-12 Système de signalisation électrique
NL8910A NL5426C (fr) 1915-11-29 1917-10-22
FR22863A FR22863E (fr) 1915-11-29 1919-09-09 Système de signalisation électrique
US368881A US1548267A (en) 1915-11-29 1920-03-26 High-frequency carrier signaling
FR27272D FR27272E (fr) 1915-11-29 1923-01-22 Système de signalisation électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US64005A US1330471A (en) 1915-11-29 1915-11-29 High-frequency signaling

Publications (1)

Publication Number Publication Date
US1330471A true US1330471A (en) 1920-02-10

Family

ID=22052929

Family Applications (1)

Application Number Title Priority Date Filing Date
US64005A Expired - Lifetime US1330471A (en) 1915-11-29 1915-11-29 High-frequency signaling

Country Status (4)

Country Link
US (1) US1330471A (fr)
FR (4) FR519170A (fr)
GB (2) GB102500A (fr)
NL (2) NL5239C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015069A (en) * 1956-11-07 1961-12-26 Rca Corp Oscillating in-phase detectors

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117052380B (zh) * 2023-10-10 2024-01-02 四川宏大安全技术服务有限公司 一种无线压力测量装置及方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015069A (en) * 1956-11-07 1961-12-26 Rca Corp Oscillating in-phase detectors

Also Published As

Publication number Publication date
FR27272E (fr) 1924-05-31
GB102500A (en) 1917-11-01
FR22856E (fr) 1921-09-05
GB102503A (en) 1917-11-30
NL5069C (fr)
FR519170A (fr) 1921-06-06
NL5239C (fr)
FR22858E (fr) 1921-09-05

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