Abstract: A modular termination system includes one or more first terminal block modules aligned side by side and second terminal block modules spaced vertically below the first modules. Jumper routing modules are interposed between the first terminal block modules and second terminal block modules and between the two rows of second modules for orderly routing of jumper wires. The second modules are hingedly mounted to a base which also mounts a plurality of cable connectors and cable guides disposed for orderly arrangement of cables running to the cable connectors. The hinges allow access to the backs of the terminals on the second terminal block modules, and to conductors wired to the back sides of the terminals from the cable connectors. The first terminal block modules are mounted upon panel-supports which also mount similar cable connectors which are joined by conductors to the back sides of the terminals on these terminal block modules.

Abstract: An electronic key telephone system is disclosed that provides a plurality of telephone features and functions, while only requiring a four-wire line between the central equipment and each key-set telephone (KST) and a two-wire line between the central equipment and each single-line telephone (SLT). Linear delta coding and time division multiplex (TDM) techniques are used to eliminate the multiple pairs required in traditional private business exchange (PBX) systems between the remote key telephones and the control unit. In the present system, a microprocessor controlled TDM controller transmits and receives control signals serially to and from interfaces in the system for control purposes and also for establishing exchange of digitized audio information data between selected interfaces. The system thus exchanges digitized audio information directly between interfaces and provides control signalling between the TDM controller and the interfaces, with all of the exchanges being done in real time.

Abstract: This telephone earphone amplifier is turned on automatically when the telephone handset is taken off-hook. To this end, the dc bias provided to the microphone from the telephone line is used to turn on a semiconductor switch that connects dc power to the amplifier. The amplifier itself is connected to amplify the incoming audio, so as to provide greater volume e.g., to aid persons of impaired hearing.

Abstract: A detector for a "Black Box" toll fraud is connected to circuits at the called party's central office and comprises a relay connected in series with the called subscriber's tip (T) lead, a fraudulent call register or indicator, and a normally open time delay switch with a timer actuated by a ringing signal on the ring (R) lead, which switch closes after a predetermined delay interval (ten seconds) to cause energizing of the register. The flow of direct current in the T lead incident to the called party going off-hook energizes the relay and deactivates the switch. The control (C) lead of the central office subscriber circuit is grounded by the off-hook state of the calling party's telephone and is connected to the register by closing of the delay switch, the indication of a fraudulent call being made by the register on removal of ground from the C lead, i.e., when the calling party goes on-hook.

Abstract: A circuit which can be appliqued to external terminals of a prior art key telephone line circuit to protect the circuit from prematurely cancelling a customer-applied holding condition when the central office exhibits an open switching interval (OSI) condition is described. The appliqued circuit monitors a contact of the key system hold relay, and when that relay is released by the appearance of an OSI condition, temporarily reconnects the winding of the hold relay across the line so that the hold relay can respond to the reappearance of central office line current if it appears after a normal OSI interval and which disconnects the hold relay if line current does not appear as during a permanent signal condition.

Abstract: An audio squelch circuit uses spectral analysis of the audio signal to derive two test signals, one of the two indicating speech presence "energy" and the other "voiced" speech presence. The two test signals are logic-AND combined to decide speech presence and open the squelch gate. Detection of speech in the audio signal, composed of a voiced segment which is both preceded and followed by a non-voiced (consonant) segment, is improved by correspondingly lengthening the "voiced" test signal pulse with both earlier (anticipatory) initiation by a time interval "D," and with a later (prolonged) completion by a time interval "d".

Abstract: Described herein are analog speech encoder and decoder systems using a plurality of narrow band pass filters with associated rectifiers and ripple filters for spectrum analyzing the speech or other suitable signals, and a corresponding plurality of narrow band pass filters with associated voltage controlled amplifiers for remaking the speech with either an injected carrier or a noise signal being applied to the voltage controlled amplifier inputs, said carrier or noise source signals being selected by a voice controlled circuit, activating the carrier in the presence of voiced sounds or vowels, and the noise source in the presence of unvoiced sounds or consonants; said innovations or the combination thereof consisting of (1) the use of a direct bypass for the high speech frequencies from the voice input to the decoder output, using a high pass filter essentially passing the unvoiced speech sounds, (2) the limitation of the bandpass filter range of the encoder and decoder sections to the cut-off frequency of t

Abstract: A mounting apparatus for communication signals exchange equipment is described. The apparatus includes supporting poles, each of which is erected close to each of the components of the communication signals exchange equipment, and further includes frameworks which are assembled horizontally above said supporting poles and rigidly fixed to the top ends of said supporting poles. The supporting poles and frameworks are provided both for mechanically supporting said components and for distributing a large number of communication signals cables between one component and other components. The construction of both the supporting poles and frameworks is completed by the time said components are located at their desired positions.

Abstract: The local battery and elements of a booster circuit of the energy storage-energy discharge type of swinging choke power converter are connected in series in the subscriber's local battery loop of a carrier subscriber station terminal. A smoothing capacitor is connected across the battery and booster circuit elements for providing a loop voltage there that may be greater than a local battery voltage where a subscriber Touch-Tone telephone set is off-hook and sending calling signals. Current in the circuit elements is monitored for controlling the duration of the portion of a cycle of operation of the converter during which energy is stored by the choke and, thus, maximum current drain from the battery. In an alternate embodiment, the smoothing capacitor is connected across only circuit elements.

Abstract: In a speech recognition system of the type including a recognition unit responsive to a voice input and a conditioning input for recognizing the voice input to produce a recognition output, a start signal is produced whenever a voice input exceeds a threshold level and a pause interval detection signal is produced whenever a voice input falls below a threshold level. An output timing signal is produced when the detection signal lasts a preselected interval of time that may be either about 250 milliseconds or about 250 milliseconds plus a delay. The recognition output from the recognition unit produced in response to the detection signal is displayed in response also to the detection signal. The result is delivered to a utilization device in response to the output timing signal.

Abstract: A telephone handset acoustic coupling cup adapted for use as part of an acoustic data coupler wherein the cup has a flexible, gripping lip surrounding an opening for receiving a telephone handset transmitter or receiver case. Each of two acoustic coupling cups may additionally be eccentrically rotatably mounted on a case in a manner that their openings may be varied in distance from one another by rotating the cups with respect to the case. The cups may also be flexible in a manner to be bendable with respect to said case, all with the view of providing an acoustic data coupler that can accept a wide variety of different sizes and shapes of telephone handsets.

Abstract: The system receives subscriber station address information in the form of frequency coded tone signals transmitted from a calling station along a common intercom circuit, and selectively accesses a called subscriber station having a corresponding station address in order to produce a call indication ring-out thereat. The system is comprised of decoder circuitry including a digital multi-frequency tone detector for receiving and decoding station address information transmitted from a calling station, and access circuitry operatively associated with the tone detector for routing an appropriate call indication signal to the called station. Signals which appear at the output of the tone detector are delivered to the access circuitry which, in turn, initiates the call indication sequence and routes additional signals back to the tone detector for controlling it during call indication.

Abstract: The invention relates to transmission systems and in particular to level regulators controlled by a pilot tone and used in such systems to correct variations over a period of time in the attenuation of the transmission system.The subject of the invention is a level regulator governed by a pilot tone whose gain control circuit locks in a mean position where there is a very low or zero value detected for the pilot tone. This locking is achieved by modifying the supply voltage of the error amplifier of the loop providing automatic gain control for the regulator.The invention is of particular application to cable transmission systems with repeaters.

Abstract: The exclusion system is employed with a central office/private branch exchange (CO/PBX) system and a party line paging and intercom system. A first circuit is coupled to the "A" lead of the party line system and is responsive to a predetermined potential on this "A" lead to couple a tip conductor and a ring conductor of an associated subset of the party line system to the tip and ring conductors of a selected one of the CO/PBX system and the party line system. A second circuit is coupled to the "A" lead of the party line system to manually generate a first exclusion potential for the party line system to exclude subsets not already connected to the party line system. A third circuit is coupled to the "A" lead of the CO/PBX system and is responsive to a given potential on this "A" lead to automatically produce a second exclusion potential on this "A" lead to exclude subsets not already connected to the CO/PBX system.

Abstract: An intercom arrangement in a key telephone system is disclosed that permits the answering of intercom calls "hands-free" at a called station. Intercom calls are originated in the standard manner, with the calling party lifting the handset at a station and selecting an idle intercom line. After the calling party depresses a direct station selection button that corresponds to the called station, a hands-free answer unit located in the called station automatically connects to the proper intercom line and provides an alerting tone to both the calling and called station. The calling party is then able to converse with the called party by alternately activating a loudspeaker and a microphone contained in the called station.

Abstract: A signalling device to be substituted for the usual electromechanical ringer of a telephone, either as a replacement for that ringer in existing telephone instruments or as a part of the original manufactured instrument. It includes solid-state circuitry for eliminating noise pulses and an electronic oscillator circuit which will operate effectively on a minimum current supply along with a mechanical arrangement of components to obtain a compact unit with a folded horn type acoustical loading system and adjustable volume control.

Abstract: A frequency analyzer of a predetermined number of channels comprises a digital band-pass and a digital low-pass filter section. A preselected number of digital samples sampled with a sampling period are stored in a buffer memory to be read out in each sampling period. A band-pass parameter memory memorizes for the respective channels band-pass filter impulse responses, each having preselected values, equal in number to the preselected number. A band-pass filter calculator calculates a convolution of each read-out digital sample and the preselected values of each response. The low-pass filter section produces frequency analysis results for the respective channels in each analyzing frame period equal to a first prescribed number of the sampling periods.

Abstract: An audiometer that automatically produces test tones of predetermined duration whose frequency and level are changed in accordance with a programme. The persons being examined actuate a switch or the like each time that a test tone is perceived and the parameters of said test tone (frequency and level) are stored in a memory. Thus, evaluation becomes very simple. Furthermore, steps have been taken to measure the background level in the test room and to ensure that the test tone is repeated when the background level exceeds a maximum value during the time that the test tone is produced.

Abstract: A filter for reducing the effective keying passband of a VOX (voice operated relay) responsive to output signals comprising pulses which follow the peak frequency pattern of the audio input pulses includes a pair of retriggerable monostable multivibrators, a "D" type flip-flop circuit, and a NOR gate which produces positive output pulses used to trigger ON the voice operated transmitter only when the input signals occur within the specified passband.

Abstract: The invention described is an electronic device for traffic measurement in telecommunication networks. The device measures the two main parameters of the carried load, known mathematically as the mean and variance of the number of calls in progress from which the mean of the offered load and its peakedness are calculated by mathematical formulas. The device monitors continuously the service channels and records the highest load in a period of sixty consecutive minutes or part thereof. The device also records the number of times when all the service channels are busy or when a certain threshold is reached and provides the facility to record the load during individual group busy hour as well as during the cluster busy hour. (A cluster is defined as a number of cooperating trunk groups with coincident or noncoincident busy hours.