A digital transmission system includes a plurality of stations sharing a common transmission line. Variable length messages, set off by flags, are exchanged between pairs of stations. While a message is being received, the downstream portion of the transmission line is segmented to permit simultaneous use by another station pair. If a message is received from an upstream station while a message is being transmitted downstream, an abort message flag terminates the transmitted message abruptly to ...

In many business applications, data about a client is created and entered on an agent's data terminal during a teleconference with the client. Often, it is necessary to transfer the client to a specialist during the course of the conversation. Alternatively, it is necessary to allow multiple parties to access information together to respond to a client's needs. This invention describes a method of sharing the call and the data terminal information associated with the call with a plurality of pho...

In known time shared amplifiers, voltage drift stabilization is effected by periodically shorting the amplifier output to the amplifier input while connecting the input terminal to a reference potential to charge an input character, which then supplies a corrective offset. This does not however effect current drift stabilization, which is effected according to the invention by a capacitor and resistor in series between the amplifier input and the reference potential. The amplifier output is now ...

A stacked shared-gate CMOS transistor and method of fabrication are disclosed. An improved CMOS transistor is fabricated by the formation of a bulk transistor and an overlying isolated (SOI) transistor wherein each transistor is adjoined to a portion of a shared gate having the same conductivity type as the related transistor. The differential conductivity of the shared gate is obtained by the fabrication of a conductive diffusion-barrier layer intermediate to conductive layers. Improved switchi...

The conference circuit provides for establishing a conference call between three conferees in a T-S-T digital switching network. The voice samples of the three conferees are sequentially stored in input buffers. When all three conferees' samples are stored, the samples are transferred to working buffers, while the input buffers store three other conferees' samples. In the time slot succeeding the transfer to the working buffers, two conferees' voice samples are compared. During the next time slo...

A data processing technique is disclosed which permits a plurality of users of a data processing system to share data in a data store, providing independent and asynchronous access to the data for subsequent processing by either user. The sharing of small data items is accomplished without requiring the use of interlocks to prevent one user from obtaining access to the shared data item while the other is processing the data for subsequent replacement in the shared data store. In addition, sharin...

A multi-channel delta modulation system providing communication between a plurality of analog signal sources and corresponding signal sinks employing a time shared delta modulation encoder and decoder.

A system for sharing a memory in a fault-tolerant computer. The memory is under the direct control and monitoring of error detecting and error diagnostic units in the fault-tolerant computer. This computer, for example, verifies that data to and from the memory is legally encoded and verifies that words read from the memory at a desired address are, in fact, actually delivered from that desired address. The present invention provides the means for a second processor, which is independent of the ...

A data entry system having a plurality of data entry key stations each having its own inexpensive, random access magnetic storage device with removable media and visual display connected to a common shared processor. Data characters of data records which are entered at the key stations are transferred to the shared processor and then transferred to a data buffer memory and to the visual display character by character. Data records assembled in the data buffer memory are transferred to the magnet...

A TCMF and MF decoder with common decoder section and separate TCMF and MF control sections. The decoder is time shared between two or more registers served on a first-come, first-served basis with priority assigned to one in case of identical seizure time. Strapping options are provided to allow the two registers to be both TCMF registers, or both MF registers, or one of each.