US2208922A - Wired radio television distribution system - Google Patents

Description

July 23, 1940. R, BUTLER 2,208,922

' WIRED RADIO TELEVISION DISTRIBUTION SYSTEM Filed March 15, 19:58 2 Sheets-Sheet 1 *28 25 FILTER E PuwER 24- MODULATOR SOURCE w M, NM)

IQ FILTER AMPLIFIER v If;

MODULATOR SOUND SOUND SOUND TELEVISION MODULATION MODULATION MODULATION MODULATION souRcE souRcE I souRcE SOURCE g I; c: 5 v 35;- L

/2 B L w 3 II If 4) n U H II V 3 5 HARMUNIC f2 GENERATOR BASE INVENTOR ATTORN EY.

July 23, 1940. H. R. BUTLER 2,208,922

WIRED RADIO TELEVISION DISTRIBUTION SYSTEM Filed March 15, 1938 2 Sheets-Sheet 2 F1G E wAM zs /30 MASTER RECEIVER TELEVISION RECEIVER RECEIVER AMPLIFIER RECEIVER AMPLIFIER REcEIvER AMPLIFIER SELECTOR REcEIvER INVENTOR CONSUMER s PREMISES I v JWER. wbflu/ Mun ATTORNEY.

Patented July 23, 1940 UNITED STATES PATENT OFFICE WIRED RADIO TELEVISION DISTRIBUTION SYSTEM Henry R. Butler, Verona, N. J., assignor to Wired Radio, Inc., New York, N. Y., a corporation of Delaware Application March 15, 1938, Serial No. 195,979

1 Claim.

This invention pertains in general-to wired radio signal distribution systems and specifically relates to a system for the combined transmission of sound and television programs.

carrier frequencies delivered thereto. I The signal modulated high frequency energy from modulators '|-9 then is delivered to amplifiers I6|8 and thence to filters 2022. Filters 20-22 re- The principal object of the invention comstrict the outputs of amplifiers I6-l8 so as to 5 prises providing an arrangement for utilizing a ensure that the modulated carrier frequencies common transmission medium for the simullie within the proper frequency channels and taneous transmission and reception of a plurality do not overlap or interfere with one another. of different program channels, at least one of A television modulation source 6 comprises 19 which comprises television signals. conventional means for producing television sig- 10 A further object comprises providing a system nals in accordance with the unit light values of for transmitting sound and television signals a field of vision. These signals are delivered to by carrier frequencies all having a definite harthe modulator l0 so as to signal modulate the monic relationship. carrier frequency delivered thereto over connec- II A still further object of the invention comtions 14 so that the output of modulator in com- 16 prises providing a system for independently proprises television signal modulated high frequency ducing a plurality of modulated-high frequency energy. This output of modulator I0 is delivered program signals and then utilizing all of such to amplifier I9 and thence to filter 23 which opsignals to further modulate a master transmiserates to properly restrict the frequencies and sion frequency for transmitting all of the proprevent harmonics or other interference with 20 gram signals over a common transmission medirespect to the other program or signal channels. um of wide range frequency characteristics, such In accordance with the invention, the output as a co-axial cable. of filters 2023 are delivered to modulator 24 These and other objects will be apparent from which receives a super-carrier frequency over 25 the following, taken in conjunction with the connections l5 from the harmonic generator 2. 25 appended drawings in which like reference nu- By way of example, this super-carrier frequency merals designate corresponding parts and in may be 3000 kilocycles. The modulator 24 therewhich: fore causes the carrier frequencies and their at- Fig. 1 is a schematic representation of one emtendant modulation side bands from filters o bodiment of the transmission system of the in- 20--23 to modulate this super-carrier frequency vention, showing apparatus units connected in as a side band of modulation frequencies. This a preferred arrangement; and modulated, super-carrier frequency is then de- Fig. 2 is a schematic representation of a ty ilivered through a filter 25, which eliminates harcal reception station for receiving and utilizing monies and D p y restricts the frequency the signals transmitted by the arrangement of range w ch is impressed 011 ee-aXial Cable 1 35 Fig. 1. for transmission purposes.

Referring to the drawings in detail, a base In accordance with the invention, a power frequency source I generates a master base fresource 26 develops commercial power such as 60 quency such as, for example, 10 kilocycles. The cycle alternating current which is transmitted base frequency source I may be any conventional over cable 28. Cable 28 may be disposed 00- 40 circuit known in the art, such as a crystal conextensively with cable 21 in the conduits of a trolled electron tube oscillator, for roducing a p w r d ri ution network as indicated at 28a sustained wave of the frequency indicated. in Fig. 2. This combined power distribution and The output of the base frequency source I television network is connected with a mulis delivered to harmonic generator 2 comprising tiplicity of consumers premises, one of which 45 conventional circuit arrangements for producing is depicted in Fig. 2.

a multiplicity of harmonics from the wave gen- Referring to Fig. 2, the power cable 28 is conerated by the base frequency source I. These nected through power transformer 29 and suitharmonics are individually delivered to moduable service equipment, not shown, to supply oplators '||0 over connections ll-l4. By way erating voltages to a master receiver 30. The 50 of example, the harmonic frequencies delivered master receiver 30 has high frequency reception over |l--l4 may be 30, 40, 50 and 100 kilocycles, circuits with broadly tuned receiving characterisrespectively. Sound modulation sources 3, 4 and ties for receiving the complexly modulated super- 5, respectively provide sound modulation signals carrier frequency from modulator 24. The

to the modulators 1-9 to signal modulate the master receiver 30 includes a plurality of dif- 55 other parts of consumers premises.

understood that the consumers premises may,

ferent filter circuits for selectively segregating the frequency components and separately delivering the television frequencies to a television receiver 3|, while delivering the sound modulation program signals to the receiver amplifiers 32-34. The receiver 30 may include a detection device for detecting the super-carrier frequency to derive therefrom the modulation frequencies separately delivered to the receivers 3l-34. The television receiver 3i includes a power connection from the transformer 29 to provide operating voltages for reproduction of the television programs.

The receiver amplifiers 32-34 respectively amplify and impress the program signals upon the consumer's power network 35 connected through a signal blocker 36 to the transformer 29. The sound program signals are then transmitted as carrier frequencies over-"power circuit 35 for reception by various sound receivers such as the receiver 31, which is selectively operable to receive any one of the sound programs. This sound receiver 31 may be positioned adjacent the television receiver 3| or may be disposed in It will be office building, or a hotel.

Lana -rm" i By the foregoing system, it is possible to transmit plural programs including sound and television systems to a multiplicity of consumers with great fidelity and flexibility of program arrangement. Although a preferred form of the system has been disclosed, it will be recognized that various changes can be made without departing from the intended scope of the invention. Therefore, no limitation is intended except as pointed out in the appended claim.

What is claimed as new and original to be secured by Letters Patent of the United States is:

A receiving system for a plurality of sound modulated carriers and a television modulated carrier all modulated on a super-carrier, said system comprising a master receiver for deriving and segregating the sound and television modulated carriers from said super-carrier, a television receiver connected to said master receiver and adapted to reproduce the television modulation, a plurality of amplifiers connected to said master receiver for amplifying the respective sound modulated carriers, a power distribution circuit, means for impressing said amplified carriers upon said circuit, and a selective receiver coupled with said circuit for selectively deriving therefrom the sound modulations.

HENRY R; BUTLER.

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