A variable duration photoflash network includes a gas discharge flash tube connected through an SCR to a charge capacitor and a transformer simultaneously applies a triggering signal to the SCR gate and the flash tube trigger electrode. A timing network includes an RC circuit whose resistor is a photoconductor and is initiated and energized with the ignition of the flash tube by the voltage developed across an inductor in series with the flashtube, which voltage charges a capacitor through a rec...

A control network that may be used to automatically turn off the drive motor and/or the mechanical drive of a tape deck when the tape has reached the end of its travel, but which also has many other uses, includes a capacitor that is connected to be charged from a source of D.C. potential. A circuit for discharging this capacitor includes a current responsive control device and a controlled discharge device having anode, cathode and control electrodes. A second capacitor connected to be charged ...

An equalizing network for correcting phase and amplitude distortions is constructed as a four-terminal T-section with the input-side series arm and the shunt arm composed of passive impedance elements and with the output-side series arm constituted by an operational amplifier having its ungrounded output terminal connected to its inverting input terminal through a resistive feedback path. The inverting and noninverting input terminals of the amplifier are connected to the ungrounded network inpu...

A switching network used to connect a number of input lines to a number of output lines via an internal time-division multiplex line. A memory and a counter for repeatedly and cyclically addressing all the memory locations is provided. An output line which is connected to the internal time-division multiplex line by means of an address decoder, the address decoders being connected to the counter, is assigned to each memory location. The memory receives in each memory location the number assigned...

A plurality of remote stations are sequentially addressed by a master controller to ascertain the status of associated sensing devices. The addresses are each comprised of a sequence of sinusoidal waveforms which are counted by the remote stations and compared with a preselected station number. Each addressed station responds by driving a communication line to a low voltage level for a time interval determined by the status of its associated sensing device.

Disclosed is a passive delay network for insertion in the high frequency signal path of a crossover network in a high fidelity loudspeaker. The delay network provides means to adjust the optimum listening window electrically rather than by changes in the physical construction of the speaker cabinet. Electro-acoustic high frequency and low frequency drivers may be mounted in a planar baffle or mounted co-axially. The delay network retains a "flat" amplitude-frequency characteristic and minimizes ...

A mechanically stable electrical network has a metal carrier and an insulating layer which supports the electrical network on the metal carrier.

A VLSI chip is provided for use with six bidirectional data buses and may be programmed to operate in one of four modes as a bidirectinal bus multiplexer, an error correction assist circuit, a register stack addressing circuit for direct or indirect addressing, or a multiport file. Depending on the mode of operation, some data buses may be utilized for inputting control signals to the chip, hence only five terminals are required which are dedicated to control signal use only. The circuits utiliz...

A peak limiter is described which employs the Hilbert transform. Effectively distinct processing occurs for low frequency and high frequency signals and harmonic distortion results only when the limiter is excited by high frequencies.

A communication network includes a plurality of nodes which are connected by transmission lines, preferably of optical fibers. One or more terminals such as general purpose computers are connected to selected ones of the nodes also via the transmission lines. Each of the nodes comprises a plurality of input channels, a like plurality of output channels and a connection controller for controlling the connecting condition between the input and output channels. Each of the input channels is paired ...