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Remote Dictating Selection Circuit

IP.com Disclosure Number: IPCOM000094555D
Original Publication Date: 1965-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Boggs, RR: AUTHOR

Abstract

The remote dictating selection circuit uses plus-minus potentials. Remote dictating station 1 including microphone handset 2 is interconnected by private wire and manually operated switch sections indicated by line 3 to dictating apparatus 4. Another remote station, not shown, can also be connected to recording apparatus 4 by switch sections indicated at 5.

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Remote Dictating Selection Circuit

The remote dictating selection circuit uses plus-minus potentials. Remote dictating station 1 including microphone handset 2 is interconnected by private wire and manually operated switch sections indicated by line 3 to dictating apparatus 4. Another remote station, not shown, can also be connected to recording apparatus 4 by switch sections indicated at 5.

The circuit enables any remote station, such as station 1, to gain access to recorder 4 and to prevent access of other remote stations while such station remains connected to recorder 4. Power supply 6 supplies plus and minus potentials such as, for example, +35 volts nominal and -35 volts nominal.

Assuming recorder 4 is not busy, access by station 1 is gained in the following manner. Lifting of handset 2 from its cradle closes cradle switches CS- 1 and CS-2. Positive potential is then supplied to the collector of thyratron transistor 7. Positive potential is also supplied through the R2-1 points, through CS-1, through R1-3 and diode 8 to fire transistor 7. When transistor 7 fires, relay R1 is energized and transfers contacts R1-1...R1-4. R1-1 and R1-2 complete circuits to recording amplifier 9. R1-3 and R1-4 supply plus and minus potentials to handset 2 for controlling machine functions at 10 by way of cable 11.

Concurrently with energization of relay R1, relay R2 in recorder 4 is energized by way of diode 12. Energization of relay R2 transfers the R2-1 points which then hav...