US2375668A - Telemeter system - Google Patents

Description

May 8,11945. G. s. LUNGE TELEME-TER SYSTEM Filed Feb. lO, 1944 25.# mst. magi Inventor: `Senor@ by )V His Attorney.

Patented May 8, 19451 i v UNITED STATE TELEMETEB, SYSTEM T GeorgeTS. Lungen Scotia, N. `Y., assigner to General Electric Company, a `corporation of `New York Application Febrary 10,1944, serial No. 521,891

T The present invention relates to a telemeter system having a channellalternatively usable for l voice or telemeter'ng.

An object of my invention is to provide an improved arrangement for disconnecting the Ttele'- meteringequipment to permit use of the channel T for voice and for subsequently reconnecting the I telemetering equipment. l

` My arrangement is especially advantageous when the telemeter transmitter is at an'unat- I prearranged code.

button, the associated transmitter transmits a tended station and voice communication is desired j between two other stations. T

The novel features which I believe to be characteristic of my invention are set forth with particularity in the appended claims. `My invention itself, however, both as to its organization and method of operation,"together with further ob'- jects and advantages thereof, may best be under-V stood byreference to the following description taken in connection with the accompanying draw# ing in which thesingle iigure is a diagram of a system embodying my invention. I

Referring to the drawing there is shown a transmission line I connecting a'pluralty of stations, three of which are shown designated `by the letters A, B, and C.` At each ofthe stations are a carrier current transmitter 2` and receiver 3with which are associated protective relays 4 n which assume control during faults and cause the transmission of the carrier current relaying signals necessary to protect 'the system. AtTtwo or more of the stations is telemeter equipment Vof `the repetitive impulse typein which the telef` .metering isefected by the frequency or duration of the carrier impulses. A telemeter transmitter 5 is illustrated at station A and telemeter receivers 6 are illustrated at stations B and C, each being `connected to the associated carrier transmitter or receiver through a `normally closed relay 'I. At each of the stations is a telephone hand-V set 8 connected to the station transmitter and receiver. While the handsets are at all times effective to receive and to transmit when a button II in the handset is depressed, during telemetering the superimposed telemetering impulses as a"practical matter make voice communication impossible. It is therefore desirable that the voice and telemetering equipment be alternatively usable. A

This is accomplished by an instantaneous relay 9 connected to the' output of each receiver which picks up when carrier signals are being received 71 claires. (ci. 17a-2.5)

relay I0 is greater than the maximum length of the telemetering impulses so the relay does not drop out during telemetering. T

When voice communication is desired between two stations, the button II at the calling station handset isclosed for an interval greater than the longest telemetering impulse and Tis thereafter openedand closed inTaccordance `with a During each closure of the carrier impulse. The first impulse, being of greater duration than the telemetering impulses, energizes therelays 9 long enough to permit the relays I0 to drop out and energize `the relays 1 to disconnect thetelemetering equipment and to close contacts I2, in circuit with call relays I3 through contacts I6 closed by relays Sduring the receptionof carrier signals., The callrelay contacts IB are `in series `with bell operating magnets I4 through hook switches I5 for Tthe handsets 8. At. the calling station, the handset is removed from the hook switch before calling so the associated bell operating magnet I4 is not energized. When the callingfstaton handset 'is rst lifted from its hookswitch, the telemeterng impulses can Ibe heard inwits` receiver. To `call :another station thebutton I I at the calling station handset is heldclosed until the`telemetering.impulses disappear, indicating the disconnection vof the telemetering equipmentand the actuation ofthe bell operating magnets I4 at other stations where the handsets are on the hook switches to cause a single stroke'on the stationcall bells I1. Thereafter the button II can be openedas rapidly as desired and closed in accordance with the calling code, each closure of the button causingan additional stroke on the bells. The bell at the called station is deenergized when the call is answered T by lifting the handset off the hook switch. This cated at other stations tends to discourage long and deenergizes a normally open time delay dropout relay I0 in series withthe associated telemeter connecting relays 1. The time delay of the permits voice communication between the stations. At other stations the bells will be energized at each change in the direction of voice communication, indicating the use of the telemetering channel for voice communication. 'Ihis is not` objectionable so long as the code calls are more than one bell stroke. The fact that the use of the telemetering channel for voice :is indiconversations.

To prevent `reconnection of the telemetering equipment during normal gaps in the conversa- A tion (and during calling of other Vstations by closing and opening the button II), the call relays I3, which are energized whilethe telemetering equipment is disconnected through contacts I2 and I6 Whenever signals are being received, close the contacts I8, energizing time delay drop-out relays I9 which until drop-out maintain holding circuits through contacts 20 for the telemeter disconnect relays 1. The telemeter disconnect relays 1 are deenergized to reconnect the telemetering equipment only upon drop-out of the relays I9. The drop-out time can conveniently be greaterk than any gap in the conversation or in the code calling. The drop-out time of the relay I9 at the station having the telemeter trans. mitter is preferably one or two seconds greater than the drop-out time of the relays lilat the other stations. This is to avoid the possibility `of telemeter impulses being applied to the chan'- nelbeiore all of the other relays 'I9 have dropped out. vIf any of the other relays I9 have not dropped out, `the telemeter impulses would operate the station bells. A 4

While I have shown particular embodiments of my invention-it will be understoodv that many modiiications may be made without departing from the spirit thereof, and Icontemplate by the appended claims to cover/any suchmodiiications as fall `within the true spirit and scope of my invention. 1

What I Vclaim as new and desire tok secure by Letters Patent of the United States is:

Il. In a telemeter system having a single channel to which are connected telemeter and voice equipment, the telemeter equipment being of the.

repetitive impulse type, a disconnect relay for the telemeter equipment, `a time delay relay responsive to' a signal of greater duration than the telemeter impulse vfor operating the disconnect relay to permit use of the voice equipment, a holding circuit for` the disconnect relay established upon its operation and including a time delayrelay operated to break the holding circuit in response to interruption of signals.

3. In a telemeterr system having a plurality of stationseach equipped with a `carrier current transmitter and receiver, a telemeterchannel of the periodic signal type having a `telemeter transmitter at onel of said stations associated with the carrierl transmitter, and a telemeter receiver associated with the carrier receiver at another station, a voice channel utilizing said carrier current. transmitters and receivers, means responsive to carrier current signals of greater nel to which are connected telemeter and voice equipment, signal responsive means for'disconjnecting the telemeter equipment, a call circuit l5 for the voice equipment rendered effective by disconnection of the telemeter equipment, and time delay means responsive to the absence of signals for a predetermined time for reconnecting the telemeter equipment. i

5. In a telemeter system having a single channel to which are connected telemeter'and voice equipment, a circuit for transmitting call signals through the channel for .the voice equipment, means responsive to said call circuit signals for disconnecting the telemeter equipment, andtime the normal gap in conversation for reconnecting the telemeter equipment to the channel, and station calling means operative to send calling signals through said channel spaced apart lessthan said interval.

7. In a vtelemeter system'having a single channel tol which are connected telemeter and voice equipment, said telemeter equipment being normally connected to said channel, a circuit for transmitting voice equipment call signals through Vthe channel during. connection of said telemeter equipmentto said channel, means responsive 4to said signals for disconnecting the telemeter l equipment, and time delay means responsive to the absence of signals for a predetermined time for reconnecting the telemeter equipment.

y GEORGE S. LUNGE. 1

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