US1759950A - Alternating-current telegraph system - Google Patents

Alternating-current telegraph system Download PDF

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Publication number
US1759950A
US1759950A US256385A US25638528A US1759950A US 1759950 A US1759950 A US 1759950A US 256385 A US256385 A US 256385A US 25638528 A US25638528 A US 25638528A US 1759950 A US1759950 A US 1759950A
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US
United States
Prior art keywords
alternating
telegraph system
frequency
current
current telegraph
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Expired - Lifetime
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US256385A
Inventor
Andrew L Matte
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AT&T Corp
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American Telephone and Telegraph Co Inc
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Publication date
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Priority to US256385A priority Critical patent/US1759950A/en
Application granted granted Critical
Publication of US1759950A publication Critical patent/US1759950A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H04L27/06—Demodulator circuits; Receiver circuits

Definitions

  • sence of the low frequency means toapply a code element comprising a
  • transformer "l means .t'o ap ply. a code element comprising a, H v l rplurality ofcycles of alternatingcurrentfof Y a c substantially constant 10W frequencyto'the p'rimaryof said transformer, and means to j periodically discharge the field of said trans formerat-afrequency ratewhichfis high as I or comparedwith the frequency of said alternate 5 v 'ing currentjthereby producing a pluralityof j: alternatiyeweveforms for each'halicycle of; 'said'alternating current, anda rectifierasso-j Y Y ciated With.
  • seidftransformer to rectifyssaid 1-1 waveformsp
  • I' I' have signed-my r v Lna'me toj this specification this 21st dayf'pfw Fehruary 1928.

Description

May 27, 1930: A. 1.. MATTE 1,759,950
ALTERNATING CURRENT TELEGRAPH SYSTEM Fild Feb. 25. 1928 h A A M V v v v v Zine Fllter IN V EN TOR.
ZZ. Waite C mom f Vent the transmission to therectiiierofh frequency" Waves correspo riding, t9, the: break I frequency.carr1er-wave.k, 3
quency to perrnit the cle fment'sof both half cycles,fand means to 'preif,
ing-lup operation in y the 'ebs'e'nc alternating current waves ofsubstantially uniform low frequen y, a receiving' 'arrangecarrier wa ye of a trainro f carrier wavescor- "respon'dingtoa codeelement, at a relatively high frequency rate to, enable-the rectifier to c rectify elements corresponding to both positive and negativefhalfcycl'e 20 carrier telegraph systenrfin whicheach code element is transmitted'zi s: alirnited number of v {alternating current Waves substantially i v uniform lowfrequency, .dvreceiying"arranger -ment comprising means to rectify halttvaves ofonly one polarity, a'nd means to interrupt both positive and negative hal'fcycles of each A. 'a low frequency alternating "current I of only onepolarity, means to' interrupti hoth. positive and negative hal fcyclesof each car I rieri'wayeoffs;ltrain-of:cir'rieriwayes corre-' r sponding to. a. code 'ele rnentf'aberelatively y I 9 high frequency, rate r to enable the, rectifier'fto Y I rectify elements "corresfionding to both ip'osi-i tive and negetive hatlfcyciegflendmeans to;
preyent theaction 'of saidinterrupting-means I from affectin 1152 1 low frequency-carrier wave.
'5. In a low frequencyf' alternatlng yrier current upon the circuit o '7. In a transmisslon system, atra'nsformer short circuiting connection of the buzzer be-. I I i 1 ing established at such points in the circuit that no change in potential will appear upon i the grid'circuit-o'fsaid detector'in the; ab f:
lternating carg. v V
sence of the low frequency means toapply a code element comprising a;
plurality .of cycles of alternating current of substantially constant low-frequency'to the primary of said transformer, and meansto' i periodicallydischarge the field'of'said transe former: at as frequencyirate Which'fis'high as V L -f compared with the' frequency of said alter-j natingcurrent. f
8. In a transmissioncsystemya, transformer "l means .t'o ap ply. a code element comprising a, H v l rplurality ofcycles of alternatingcurrentfof Y a c substantially constant 10W frequencyto'the p'rimaryof said transformer, and means to j periodically discharge the field of said trans formerat-afrequency ratewhichfis high as I or comparedwith the frequency of said alternate 5 v 'ing currentjthereby producinga pluralityof j: alternatiyeweveforms for each'halicycle of; 'said'alternating current, anda rectifierasso-j Y Y ciated With. seidftransformer to rectifyssaid 1-1 waveformsp In testimony whereof,' I' have signed-my r v Lna'me toj this specification this 21st dayf'pfw Fehruary 1928.
g'the rectifier in thie absenceof a??? y I I "current v carrier .tele'graph sy'stemkin 'Which'each code element, istransmittedas a-1iinited number of v v c alternating'gfcurrentlwaves; o'f isuhstantially u i or w7f eqi e i y,ge ec iv ngs i 'c o p elfi t i fle ces a "tm 7' l former 1n;.theLgr1d"circuitRot :sa 'd detector,
' c and la n .b'uzzerfconnected'"to "short jci rcuit' the: v
highfrequencyrategthereby fleguvey inter fprimary'of said. transformerfalt' drelati-velyf c p i ipd tive an etiv hl l sjor e ch rrie ;cy le oft nefcarri 'w ves corresponding to acodeeleinenttogeneblegthef]; detector to rectify 'componentscorresponding to both positive andfnegativeihelf'Tybls; 3 V j 6;..In c'low'frequencyalt carrierltelegraph, systelni I 'e1eniei1tis trei'nsmittedasa niitedjnunihef of V chem-siting current wa es;
, iconiprising. a; rectifying detector, "at: trains; former inthe grid circuit of said detiectofic- 1 I j i *buzzer connectedtoshorflcircuit the primary L ofsaidtransfo'rmer at wrelatiyely high st-res, q encym thereby effectivelyinterrupting 1 both positive and negetiye' halyesofgach "caLr' i ib 1 0M tr i ofi r er; j escb e 1 'spondingto a; code' elen enttoenable the de V ctq c fy cqi pb i i fie r pefid i b both positiye and 'iiegat' u tan ial y uniform; low frequency, c a receiving circuit
US256385A 1928-02-23 1928-02-23 Alternating-current telegraph system Expired - Lifetime US1759950A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US256385A US1759950A (en) 1928-02-23 1928-02-23 Alternating-current telegraph system

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Application Number Priority Date Filing Date Title
US256385A US1759950A (en) 1928-02-23 1928-02-23 Alternating-current telegraph system

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US1759950A true US1759950A (en) 1930-05-27

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