Abstract: Disclosed is a network interface device for connecting network wiring to a subscriber's wiring at a subscriber's premises, the network interface device having a door covering a test jack, with means for connecting the network wiring to the subscriber wiring when the door is closed and connecting the network wiring to the test jack when the door is open.

Abstract: A system of impedance matching is provided to match the total impedance of the cable system to the total impedance of the powered elements such as the repeaters. The source impedance of the power supplies may be considered as part of the cable impedance. By matching impedances, the source voltage for driving the electronics is advantageously minimized.

Abstract: An electronic exchange capable of providing at least a calling number delivery (CND) service, including a registration search unit for investigating whether or not a call terminating subscriber is registered to use the CND service every time a call is initiated from a call originating subscriber, a confirmation unit for inquiring to the call originating subscriber, if the call terminating subscriber is registered to use the CND service, whether or not the call originating subscriber intends to achieve a calling number delivery blocking (CNDB) service, and a selective transmission unit for transmitting or not transmitting data indicative of the telephone number of the call originating subscriber in accordance with an answer responding to the inquiry by the confirmation unit.

Abstract: Symbol sequences of varying lengths and having logical meanings other than as network addresses (e.g., subscriber names), are assigned and used as actual telecommunications network addresses, without imposition of predefined fixed lengths, formats, or orderings on their constituent segments (e.g., given name, surname), in a call-processing arrangement (200) that uses stored definitions of syntax (320, 350) and grammar (400, 410) of the network numbering plan. The syntax definitions include definitions (312) of individual address segments, called symbol strings, which have logical meanings. Each string's definition includes a string length range (332), a string type (331), and an indicator (VNI 334) of the string's influence on call treatment (e.g., route) selection.

Abstract: Announcements from a voice messaging system that either prompt a user for action or provide information to a user are constructed independent of the language in which the announcement is provided to the user. In particular, each announcement is treated as a "semantic expression" having an announcement identifier. This announcement identifier is mapped into a plurality of rules, each rule providing instructions on how to construct the announcement for a particular language. The rules can recursively call other rules to provide additional flexibility in constructing a particular announcement.

Abstract: A facsimile machine includes a scanner for scanning documents and outputting image data corresponding to images on the documents, a destination controller for specifying a destination station to be called, a voice storage for storing a plurality of voice messages, a selecting controller for selecting one of the voice messages stored in the voice storage, a transmission unit for transmitting the image data output from the scanner and a voice message selected by the selecting controller to a called destination station specified by the destination controller, a receiving unit for receiving image data and a voice message transmitted from another facsimile machine, a printer for printing the image data received by the receiving unit on a recording paper, and a loudspeaker for outputting the voice message received by the receiving unit.

Abstract: An improved terminal connecting block and bracket assembly is disclosed. The terminal connecting block contains four sets of flat elongate electrically conductive elements. Each of the third set and each of the fourth set of elements is electrically isolated from the other sets of elements, and a unitary connector connects the sets of elements to auxiliary devices and central office equipment. Removable bridge connectors provide different interconnections without rewiring. The terminal connecting block is used with a bracket for mounting the block on a surface.

Abstract: A station protector module contains telephone company terminals and subscriber terminals. The module has apparatus for grounding the module in a network interface device and also has means for grounding upon extended grounding current flow through a surge protector in the module. The grounding apparatus becomes operative upon the melting of a fusible means. The surge protector is a single component bidirectional voltage sensitive switch.

Abstract: If a communicating terminal connected to a communication line in a private branch exchange system is disconnected from the communication line, then, on the basis of call identifying information contained in an interruption message and in a resumption message, communication is put on hold and is subsequently resumed after the terminal is re-connected. This allows the terminal to be moved between the same or different communication lines while preventing loss of communication.

Abstract: A transmission input/output device for signal transmission through a telephone line, with reduced power consumption, size, and cost. The device includes: a resistor, connected to the telephone line, for setting a signal input and output impedance; and a transmission control circuit for amplifying the transmission signals to be outputted to the telephone line, including: a variable resistor, connected in series with the resistor, for supplying voltages corresponding to the transmission signals to be outputted to the telephone line into the resistor according to changes of an impedance of the variable resistor; and an operational amplifier for controlling the changes of the impedance of the variable resistor by supplying an output according to the transmission signals to be outputted to the variable resistor.

Abstract: The characteristics of a room in which a speakerphone (20) is located are measured by determining a time between a test signal and its first attack, and a number of sample periods between the first attack and a time when the average power in the echo falls below a threshold. The first-attack time determines a pre-filter delay and the number of sample periods determines a tap length for an adaptive echo-canceling filter (62). In a teleconferencing environment, an annoying initialization sequence is avoided by initializing filter coefficients for each microphone (140), and saving the initial filter coefficients generated thereby in a corresponding nonvolatile memory (104). In response to an off-hook signal, the coefficients are retrieved from the nonvolatile memory (104). During operation, the coefficients are constantly updated. If another microphone (141) is enabled, the stored coefficients corresponding to that microphone (141) are dynamically substituted for the present coefficients.

Abstract: A hold displaying system includes plural multifunction telephone sets each of which has a hold indicator, and an exchange for accommodating the telephone sets. Each multifunction telephone set cooperates with the exchange to perform a hold display on the hold indicator of the respective multifunction telephone set. When information for a multifunction telephone set to which a hold display is forwarded is sent from a multifunction telephone set on a hold operating side to the exchange, the exchange transmits its hold display switching information to the multifunction telephone set to which the hold display was forwarded, whereby the hold indicator indicates the same hold display as that provided by the multifunction telephone set to which a hold display has been forwarded during its holding operation.

Abstract: An audio amplifier for providing a power boost for telephone-sourced audio signals that drive one or more paging speakers employs a class D amplifier and a state variable feedback network, which monitors voltage and current levels of an audio output filter to which the paging speakers are coupled, so as to adjust the operation of the amplifier circuit, as necessary, to compensate variations in the speaker loading of the audio output filter. The class D amplifier includes a pulse width modulator, which controls the switching of a power H-bridge-configured switching circuit. The switching circuit sources and sinks current with respect to the paging speaker load. The output of the power bridge switching circuit is a high energy square wave-type signal, which is filtered in a downstream audio filter to remove the switching transients and preserve the desired voice paging signal for application to the paging speakers.

Abstract: A telephone call is made by a calling party. The telephone call is routed through a telephone network to a piece of terminal equipment. The terminal equipment analyzes call information associated with the telephone call. The call information is divided into separate call attributes, such as calling telephone number and called telephone number. One or more number lists, stored in the terminal equipment, are then searched to see if they contain an entry that matches the call attributes. If a match is not found, the call is rejected. If one or more matches is found, the call is routed as specified by the number list entry having the most optimal match. The number lists can be easily user-modified.

Abstract: The initiator of a conference call provides conference requirements such as number and location of parties to be conferenced, time for beginning and end of conference, and telecommunications facilities requirements (e.g., bandwidth requirements for video and multi-media calls), to a conference optimization system (COS). The COS compares the requirements with information in a database, including (a) the cost for each of the paths/routes at the desired time for the conference, (b) available network paths/routes, taking into account the required bandwidth and quality of transmission, and (c) capabilities of the terminal equipment available to the participants.

Abstract: A received signal vector x(n), a coefficient error covariance matrix P(n) from a memory part 12 and a forgetting factor .nu. from a memory part 13 are provided to a gain calculating part 14 to obtain a gain vector k(n). The thus obtained gain vector k(n) and an error e(n) between an echo and an echo replica are multiplied in a multiplying part 16. The multiplied output and a filter coefficient h(n) from a memory part 18 are added together to update the latter. The thus updated filter coefficient is used as the filter coefficient of an estimated echo path (an FIR filter, for example). The coefficient error covariance matrix P(n), the gain vector k(n), the received signal vector x(n) and the forgetting factor .nu.

Abstract: Disclosed is an exchange system, to which a plurality of extension terminals are connected, for effecting a connection to any of the extension terminals upon receiving, from a network, incoming-call information which includes at least extension terminal designating information or attribute information. Also disclosed is a call connecting method in this exchange system. The plurality of extension terminal designating information and the extension terminal information are stored, in correlation, in a first memory, and representative extension information corresponding to the attribute information are stored in a second memory. Reference is made to the first memory to decide an extension terminal corresponding to the extension terminal designating information contained in the incoming-call information. When a decided extension is incapable of receiving an incoming call, a connection is made to a substitutable extension.

Abstract: A focusing apparatus for a video camera or the like in which a change-over between automatic focusing and manual focusing is possible includes an endlessly rotatable and hand-worked manipulator, a detector for detecting the direction and amount of manipulation or rotational movement of the manipulator, and a controller/driver for moving a part of the optical elements in an optical system along its optical axis direction in a direction corresponding to the direction of manipulation of the manipulator detected by the detector and by a distance corresponding to the amount of manipulation of the manipulator detected by the detector, thereby taking the focus.

Abstract: A dual tone detector (100) for a single dual tone, a dual tone multi-frequency (DTMF), or similar system processes an input signal through both bandpass (103) and band reject (104) tone detectors. If both the bandpass (103) and band reject (104) tone detectors detect a tone, then the dual tone detector (100) provides a tone detect output signal. If only the bandpass tone detector (103), which is susceptible to false tones, detects a tone, then a voice input signal is muted and the tone detector (100) activates the tone detect output signal only if both the bandpass (103) and band reject (104) tone detectors subsequently detect a tone. In one embodiment, a dual bandpass/band reject tone detector (120) processes the input signal through shared front-end band reject filters (121, 122), limiters (124), resonators (127, 128), and a processing section (130) in order to save circuit area. Limiter and peak detector functions are also implemented in shared circuitry to further reduce circuit area.

Abstract: A telecommunications system allows multiple users to place and charge telephone calls to personal debit accounts without requiring specially designed telephones or "smart" cards. The system keeps track of the cost of each call, including applicable taxes, in real time and notifies the user when the account balance approaches zero. The system allows the user to restore the account balance in real time either manually or automatically by charging the increase to a commercial credit card. The system has one or more local area networks with means for receiving an inbound call and means for performing-a function in response to the inbound call, where both means perform concurrent processing.