Abstract: The disclosure relates to a monitoring system for monitoring the average wait time for service in a toll telephone operating system of the type which includes a plurality of access trunks which are conditioned by subscribers upon initiating calls for service, a plurality of operator positions for servicing the calls for service, a switch network for connecting the calls for service to available operator positions, and a network control for controlling the switch network. The system includes means for detecting and storing the total number of outstanding calls for service awaiting service by an operator position during a most recent preset time interval and means for detecting and storing the total number of calls for service which have been connected to operator positions during the most recent preset time interval. The system also includes means for updating the total number of outstanding calls for service and the total number of calls serviced at predetermined time periods.

Abstract: A cord adapter for retrofitting or adapting a conventional telephone line cord for use with a miniature plug and jack assembly, the cord adapter being of a construction such that no tools are required to install it.The cord adapter will accommodate from one to six conductors and requires only that the spade terminals on the conductors be bent into a U-shaped configuration prior to installation into the plug portion of the adapter. A slot is molded into the plug body for retaining the line cord holder, which slot also functions as a bending fixture for bending the spade terminals on the ends of the conductors of the line cord. A plastic cover is provided for covering and retaining the connections. The cover furthermore helps retain the telephone line cord. The construction of the plug portion of the cord adapter and the cover is such that the cover can be attached to the plug portion without the need of any tools.

Abstract: Apparatus for selecting the operational mode of a particular input/output device in an expandable modular electronic data processing system employing microprocessor devices and testing the I/O device without the use of additional input/output addresses. Input/output interface modules associated with corresponding ones of the I/O devices include a plurality of flip-flops having corresponding memory addresses associated therewith for testing and selecting the operational mode of the I/O device in accordance with the contents of the flip-flops.

Abstract: A direct current power supply is capable of delivering up to 1 ampere at 60 to 80% power efficiency from a storage battery source, providing a positive DC power output free from inductor-generated type switching transients. The converter embodies a regenerative switching mode means which alternately drives two sets of paired power transistors, turning on each one pair of power transistors for one-half cycle. Each one of the power transistor pair alternately transfers electron charges to a first one of two switch-coupled capacitors, thence to the second one of the two capacitors, and then to a positive voltage terminal. RC clipping circuitry is coupled to each one of the pair of power transistors providing faster resetting times for the power transistors, increasing the converter power efficiency by decreasing storage-time delay. By decreasing power transistor direct shorting time during power transistor switching between transistor pairs, power loss is decreased.

Abstract: An incoherent adaptive transversal equalizer for the receiver of a differentially phase-modulated data transmission system wherein a pair of tapped delay lines are located in memory of a digital computer or central processor which performs equalization of a sampled data signal according to the mean-square error algorithm defined by equations (1) - (4). In-phase and quadrature-phase tap gains c.sub.-.sub.n and d.sub.-.sub.n are each selectively combined with both the in-phase and quadrature-phase sampled signal component words A.sub.k.sub.+n and B.sub.k.sub.+n, respectively, at associated tap lines of the delay lines (except the principal or center tap line, where n = 0 here) to produce a plurality of weighted tap signals c.sub.-.sub.n A.sub.k.sub.+n ; -d.sub.-.sub.n B.sub.k.sub.+n ; c.sub.-.sub.n B.sub.k.sub.+n, and d.sub.-.sub.n A.sub.k.sub.+n. These weighted tap signals and the center tap line signals A.sub.k.sub.+0 and B.sub.k.sub.

Abstract: The input waveform is applied via an input resistor to the inverting input of an operational amplifier. The non-inverting input is grounded. In the preferred embodiment, two feedback networks, each comprising a diode and resistor network, are connected between the output and the inverting input of the amplifier. The diodes are oppositely poled. A capacitor is connected to ground at one end and to a charging resistor at the other. The other end of the charging resistor is connected to a junction formed by the resistor and diode in one of the feedback loops. The charging resistor is selected so that the value of the voltage for the reference which is supplied by the voltage across the capacitor C, e.sub.c, is of the value to obtain the percentage clipping desired. A discharge resistor is selected so that the capacitor and discharge resistor has a long time constant with respect to the input frequency of the waveform.

Abstract: A regimented memory arrangement in which "Read" and "Write" operations take place simultaneously. Three-way communications are facilitated by the technique disclosed.

Abstract: An electronic tone ringer for use in telephone subsets. Operating in response to and powered from incoming received ringing signals, the ringer circuitry provides audible multitone signals. The circuitry employed eliminates so-called "bell tapping" or "chirping" during dialing.

Abstract: Communication system interface circuits for bi-directional transmission of signals between terminal sets, each interface circuit comprising a transformer including first winding means coupled through rectifier means and a low-pass filter to a first terminal set and including second winding means having end terminals coupled through diodes to the output of a high frequency inverter and having a center tap coupled through an inductive impedance to a neutral circuit point, a second terminal set being coupled across the inductive impedance. The first terminal set may be connected to a telephone subset with ringing and bias signals being applied in circuit with the inductive impedance. The inductive impedance includes transistor means controlled by an operational amplifier which is controlled from a resistance-capacitance phase-shift means, the impedance being equivalent to that of an inductance and a series resistance.

Abstract: In a communication switching system including a control unit for establishing connections through a switching matrix, the connections being established during a cycle of the control unit and the cycle being divided into a number of sequence states or sub-cycles which established logical functions are to be accomplished before advancing to the next sequence state, an arrangement for making the sequencing of the control unit permissive instead of absolutely controlled by a timer set for worst case operation. With the disclosed arrangement, advance to the next sequence state is permitted as soon as all of the logical functions are accomplished. The control unit also can advance to the next sequence state if the worst case operating time is exceeded, and with a peg count of the occurrence being made.

Abstract: An intercept arrangement by which on calls incoming to a key telephone system the calling party is provided with one and only one complete recorded message within a relatively short time so that the number of abondoned calls caused by excessive delays in answering is reduced. The arrangement includes ring counting, transfer and intercept trunk circuits on a one-per-line basis and a common intercept recorder. The trunk circuit has a monitor feature to provide a form of calling party release for all offices, and a standby-music facility which becomes effective after the transmission of the message.

Abstract: This invention relates to signal detecting and in particular to apparatus and a method for detecting one or more audio frequencies (tones) contained in a Pulse-Coded Modulation (PCM) signal.

Abstract: An arrangement and method for the localized self control of randomly allotted time slots to audio ports wherein simple control circuits with a memory are dedicated on a per audio port basis. A common control writes into the memory the time slot identity allotted to an audio port. The time slot identities generated by a channel counter are made available to all of the audio ports in the system, and a comparator in the control circuit associated with an audio port compares the stored time slot identity with the variable or varying time slot identities. An audio port is turned on and off without external control every time the two identities match. With this arrangement, any number of audio ports can have the same time slot identity, all turning on and off simultaneously in the same time slot to share the transmission medium.

Abstract: A bus assigner in an electronic data processing system for selectively assigning access to a system bus to one of a plurality of microprocessors comprising a multiprocessing system. In an embodiment of the present invention, logic circuitry is provided for assigning a priority of operation to each of the microprocessors, each microprocessor having a different assigned priority. The bus assigner selectively assigns access to the sysstem bus to the microprocessor having the highest priority whenever one or more of the microprocessors requests access to the system bus. In an alternative embodiment, the bus assigner sequentially scans the microprocessors for requests for access to the system bus and assigns access to the system bus in the order in which the requests are received by the bus assigner as it scans the microprocessors.

Abstract: A traffic analysis system is disclosed which utilizes a scanner to provide the identity of the trunk group within which a call attempt has occurred. The trunk group identity information from the scanner is supplied to a multiplexer which makes available four, 8-bit words based on the trunk identity information from the scanner. A micro-processor is coupled to the multiplexer and upon the occurrence of a call attempt the micro-processor adds the four words from the multiplexer, the sum of these words yielding the address of the proper storage location in a memory unit for storing the call attempt indication.

Abstract: A digital line synchronizer system for use with a digital PCM TDM switching exchange will provide a vector address off-set between the address locations of WRITE and READ vectors within a multiple frame input buffer memory bank of the incoming line equipment upon the occurrence of either a loss of receive framing synchronization or the equalization of time reference between the WRITE and READ vectors with respect to the input buffer memory bank. The vector address off-set is provided to prevent the condition of information distortion due to the phenomenon of vector slippage whereby a given channel/word slot within the multiple frame memory bank is twice written with incoming PCM data under the operation of the WRITE vector address before the first stored sample of PCM data can be retrieved via the use of the READ vector address.

Abstract: Apparatus for and method of separating elongated articles having certain aerodynamic properties from a mixture containing contaminating particles of random shape is disclosed wherein a housing is diagonally divided into upper and lower chambers with a separation apparatus communicating between the chambers. The separation apparatus includes a funnel disposed within the upper chamber, a diffuser tube disposed within the lower chamber and a tubular neck connecting the funnel to the diffuser tube. A hopper is disposed above the funnel for dispensing the mixture to the funnel. A fluid, such as air, is forced into the lower chamber at a sufficient pressure to establish a predetermined flow rate through the diffuser tube and tubular neck to the base of the funnel. This flow rate is adequate to create a "fluidized bed" in the mixture, at the base of the funnel, permitting the articles and contaminating particles to move relative to each other.

Abstract: A digital phase detector which periodically detects the phase angle .theta..sub.k of a carrier signal in which data are encoded as discrete phase changes. A coherent or differential phase-modulated carrier signal is split into its in-phase and quadrature phase components R.sub.o Sin.theta.(t) and R.sub.o Cos.theta. (t). Each signal component is sampled at a predetermined modulation interval and converted into a digital word having the form R.sub.o Cos.theta..sub.k and R.sub.o Sin.theta..sub.k. In one configuration, the two signal components are applied to a digital divider network which forms the quotient .PSI. of the two digital words such that .vertline..PSI..vertline..ltoreq. 1. The quotient .PSI.is applied to a data look-up ROM, programmed for Tan.sup.-.sup.1 operation, which forms a digital reference phase angle .PHI.limited to an angle .ltoreq. 45.degree. is corrected by selection logic to form the desired phase angle .theta..sub.k. Once .theta..sub.

Abstract: Apparatus for remotely controlling automatic telephone answering devices or the like to transcribe message information magnetically recorded by the telephone answering apparatus. The apparatus includes an oscillator coupled to an input/output transducer for generating a tone of a predetermined frequency which is coupled via a telephone to the automatic telephone answering apparatus. The tone switches the answering apparatus into a high speed rewind mode wherein the message information is not muted. The message information is recorded in reverse on a magnetic tape in the transcribing apparatus by a tape transport mechanism transporting the tape in a forward direction during a record operation. During playback, the tape transport mechanism transports the tape in the reverse direction so that the reverse recorded message information is played back in an intelligible manner to convey the recorded message information.

Abstract: A case for electrical components is disclosed in which a pair of arms extend outward from the annular wall of the case, the arms being flexible and adapted to allow the case to be attached to a mounting member having spaced apart edges by pressing the free ends of the arms against the spaced apart edges where upon the flexible arms move outward and allow the case to be snapped onto the mounting member.