Gte Automatic Electric Laboratories Incorporated

Gte Automatic Electric Incorporated

Robert H Beeman

Lloyd A Tarr

Stanley J Chmura

An arrangement for monitoring the admittance of a line during a frequency sweep is disclosed which upon detection of the characteristic admittance level determines the loaded or unloaded status of a transmission line. Output logic associated with detection circuits provides a digital indication of the status detected.

Cable load status detector

A circuit for monitoring the alignment of analog-to-digital converters. The digital output signal from a converter under test is separated into positive and negative component signals which are compared by a subtraction circuit. A difference signal is then generated by the subtraction circuit to represent the required converter adjustment. Also included are adder circuitry for a sum output and provisions for analog display.

Analog-to-digital converter alignment circuit

A synchronizer circuit for use with tone receivers employed in the reception of asynchronous tones. A plurality of latch stages controlled by an external clock pulse source and internal timing circuitry provides synchronized outputs of a series of signals which represent the input tone on-off sequences.

Tone detection synchronizer

A parity checking circuit for use in multifrequency tone receivers is disclosed wherein associated receivers are made less susceptible to digit simulation when talking is present, by verifying that the same two tones are present for the entire parity timing period.

Multifrequency signal parity detector

A circuit for generating precise tone signals for use in telecommunications systems, such as dial tone, busy tone, ringback tone, etc. the circuit provides tone signals at a level suitable for application for distribution throughout a telephone central office. A facility for providing interrupt of the signals at either a 60 or 120 IPM rate is included.

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Berkeley, IL, United States of America

Robert H Beeman