Abstract: A call transfer system is disclosed which comprises: an information processing system accommodating a plurality of terminals each having input means; and a telephone exchanging system accommodating a plurality of telephones preliminarily interrelated to the respective terminals; the information processing system monitoring an input operation performed by the input means of each of the terminals, and transmitting information indicative of the input operation to the telephone exchanging system; the telephone exchanging system controlling a call transfer operation, based on the information on the input operation transmitted from the information processing system, to transfer a call received by a telephone to a predetermined transfer destination if no input operation is performed at a terminal corresponding to the telephone, and not to transfer the call if an input operation is performed at the terminal.

Abstract: A user initiated soft call park with recorded voice comfort notification system for use within a telephony server for wired or wireless telephones. In response to receiving an incoming call, a user depresses a function key on his or her telephone set. The telephony server responds to depression of the user's function key by placing the incoming call on soft hold and generating a recorded message for indicating to the calling party that the call will be answered shortly.

Abstract: A method and apparatus for acoustic signal processing of speech recognition, the method comprising the following components: 1) Decompose each syllable into two phonemes of comparable length and complexity, the first one being a preme, and the second one being a toneme; 2) Each toneme is assigned a tone value such as high, rising, low, falling, and untoned; 3) No tone value is assigned to premes; 4) Pitch is detected continuously and treated the same way as energy and cepstrals in a Hidden Markov Model to predict the tone of a toneme; 5) The tone of a syllable is defined as the tone of its component toneme.

Abstract: A facsimile system of distinctive ringing type capable of selective telephone and facsimile communications with a remote party calling one of telephone numbers used by the system such that the telephone numbers are called by respective call signals having respective different patterns, the system including a pattern registering device for registering as a facsimile reception pattern the pattern of the call signal assigned to call the telephone number which is exclusively used to receive a facsimile signal from the remote party, a pattern determining device for determining whether the received call signal has the registered facsimile reception pattern, a facsimile receiving device for automatically processing the facsimile signal if the call signal has the facsimile reception pattern, and a conditional facsimile reception device for automatically processing the facsimile signal if a predetermined condition is satisfied, even if the received call signal does not have the registered facsimile reception pattern.

Abstract: A system and method using personal identification numbers and associated prompts for controlling unauthorized use of a security device and unauthorized access to a resource. The method includes requesting an authorized user of a security device to select a set of N PINs and N distinct phrases, each one of the N distinct phrases being associated with a corresponding one of the N PINs for acting as a prompt to remind the user of the corresponding one of the N PINs. A current user of the security device is prompted using one of the N distinct phrases and the user's response to the prompt is compared to the associated PIN to determine whether the current user of the security device is the authorized user. The current user is granted access to the resource or is granted use of the security device if it is determined that the current user of the security device is the authorized user.

Abstract: A technique for powering telephone lines using an unbalance current source and current sink; and a technique for improving attenuation/frequency distribution and return loss (impedance matching) of transformer-coupled wire-line communications circuits by using secondary series capacitance and an AC current pump signal source; and a generation of ringing voltage as positive voltage pulses with respect to a negative power supply voltage; and a technique for removal of AC power ripple by using an active linear floating filter for the purpose of powering telephone line circuits, and a technique for injection of real time tone samples into T1 transmissions circuits by use of a T1 framer idle code register.

Abstract: The balancing bridge circuit is provided between a four-wire circuit and a two-wire circuit, to provide a thin-type balancing bridge circuit having satisfactory transmission characteristics and a MODEM and an exchange and a repeater of a telephone circuit having this balancing bridge circuit built therein. The transmitting terminals of the four-wire circuit and the connection points of the balancing bridge circuit are connected together through the photo-coupler. The receiving terminals of the four-wire circuit and the connection points of the balancing bridge circuit are connected together through the photo-coupler. The terminals of the two-wire circuit are connected to the connection points of the balancing bridge circuit. By the presence of the compact photo-couplers, it is possible to ground the transmitting terminal and the receiving terminal together. Common-mode noise reaching the terminals is not transmitted to the receiving terminals.

Abstract: A system and method for selecting and generating telephone access numbers for limiting access to a telephone service. The system includes an auto-dialer having a system clock, a memory device, a processor, and a tone generator. The auto-dialer is used to transmit user-associated data to a telephone service. The system clock generates a system time and the memory device stores data and a plurality of telephone numbers, each of which is capable of accessing the telephone service at different times. The processor is electrically coupled to the system clock and to the memory device and can select the telephone number capable of accessing the telephone service at any moment in time as a function of the system time. The auto-dialer can also include a number generator operating according to a preselected pseudo random sequence, in electrical communication with the system clock and the processor, where the output of the system clock is used as a seed number to the number generator.

Abstract: A system and method for providing advanced voice services to subscribers of a telecommunications network are disclosed. The system comprises a local switch connected to the telecommunications network for providing two-way communication between the subscribers and the network. A database of subscriber services, which may be a virtual service switching point (ViSSP), is connected to the local switch, and an intelligent peripheral (IP) is connected to the database and the local switch. The IP processes voice information and dual tone multi-frequency (DTMF) digits received from the switch in response to instructions from the database. The system retrieves subscriber services from the database utilizing a call-setup protocol such as the Integrated Services Digital Network (ISDN) User Part (ISUP) call setup protocol, and provides the services to the switch. The system also retrieves the processed voice information and DTMF digits from the IP and provides the processed information and digits to the switch.

Abstract: A system for detecting the presence, in an audio channel which may contain voice signals, of a tone at a frequency selectable from among a plurality of selectable frequencies. A bandpass filter receives the audio input; its center frequency is selectable in response to a control signal. A first detector circuit provides from the output of the bandpass filter an output signal when a tone containing substantial energy at about said center frequency is input to the filter. A band-stop filter having the same center frequency as the bandpass filter also receives the input audio; a second detector circuit demodulates and thresholds the band-stop filter output.

Abstract: A transparent telephone access system using voice authorization includes a method and system (30 and 60) to protect against the unauthorized use of telephone network (20). By receiving a spoken telephone number (14) from telephone unit (16) and recognizing the spoken phrase that corresponds to telephone number (24), the method and system permit transmission through telephone network (20) to telephone (22). The method and system record spoken phrase (14) in voice recognition server system (18). For the spoken phrase, a voice-template is formed and compared with a voice template formed from a composed phrase including pre-existing or stored spoken digits. In response to the comparison, use of telephone system (16) through telephone network (20) is permitted.

Abstract: A digital access arrangement, coupled between a data terminal equipment having a transmit line and a receive line and tip and ring lines of a network, having a circuit that provides polarity check, hook/switch control, and data modulation functionality. The circuit includes a controller and six controllable switches, each having a conducting state and a blocking state.

Abstract: A conversion system using a lookup table of adjustment values for converting non-linear, logarithmic pcm codes between attenuated and unattenuated formats. A computer accesses attenuated pcm codes from a compression device, such as that found in the transmit portion of a digital speakerphone, and retrieves an adjustment value from the lookup table using the measured pcm code and a gain code. The gain code corresponds to a gain setting asserted by the computer to a gain device in the transmit portion of the speakerphone. The lookup table is preferably implemented in hardware, such as a ROM, RAM, PLA or similar type device, or is implemented in software or firmware executed by the computer. The retrieved adjustment value is added to the attenuated pcm code to determine the corresponding unattenuated pcm code.

Abstract: A computerized system time aligns frames of spoken training data against models of the speech sounds; automatically selects different sets of phonetic context classifications which divide the speech sound models into speech sound groups aligned against acoustically similar frames; creates model components from the frames aligned against speech sound groups with related classifications; and uses these model components to build a separate model for each related speech sound group. A decision tree classifies speech sounds into such groups, and related speech sound groups descend from common tree nodes. New speech samples time aligned against a given speech sound group's model update models of related speech sound groups, decreasing the training data required to adapt the system. The phonetic context classifications can be based on knowledge of which contextual features are associated with acoustic similarity.

Abstract: In a ring trip circuit, a trip detecting circuit includes a low pass filter connected to opposite ends of a first resistor detecting an AC ringing signal, a diode bridge connected to an output of the low pass filter, a first series circuit connected to an output of the diode bridge and composed of a Zener diode and a light emitting diode of a first photocoupler, so that a phototransistor of the first photocoupler outputs a trip detection signal to a circuit which can be driven with a different power supply. A zero-crossing point detecting circuit has a second series circuit connected to the opposite ends of the first resistor and composed of a second resistor, a second Zener diode and a light emitting diode of a second photocoupler, so that a phototransistor of the second photocoupler outputs a zero-crossing point detection signal to a circuit which can be driven with a different power supply.

Abstract: An Intelligent Peripheral (IP) is used in combination with both narrowband type services (e.g., voice mail) and broadband type services (e.g., video transmission) and may provide protocol conversion, message translation, speech recognition, message editing and/or message-to-text conversion. The IP has a gateway switch between the various internal processing modules and the network line or trunk connections. The gateway switch provides selective routing of incoming calls to the appropriate modules, some modules providing narrowband type services and other modules providing broadband processing.

Abstract: A system for use of a telecommunications voice network includes a communication node local to a calling location for acquiring calling and called party identification numbers and transmitting them to a central switching unit associated with a called location, through a transception channel independent of the telecommunications voice network. Further provided is a central switching unit for interrogating the called location to obtain a call supervision status thereof. Also provided is an apparatus for completing a first phonecall from the switching unit to the called location if the call supervision status is that of an answer, and for originating a second phonecall through the telecommunications network to the calling location. Teleconferencing of the first and second phonecalls then occurs. Further provided is an apparatus for providing an uncompleted call status signal to the central switching unit if the call status is that of a no answer or busy. The calling party is then appropriately advised.

Abstract: An automatic line equalizer for use with a T1 or an E1 repeater in a telecommunications system is disclosed. The equalizer includes a first equalizing means for equalizing an input line having a line length falling within a first range and a second equalizing means for equalizing an input line having a line length falling within a second range. The equalizer includes a line condition/length detector. The equalizer includes switch means for selectively coupling one of the first and second equalizers to the selected input line as a function of a line condition indication. The switching means prevents hunting between said first and said second equalizers.

Abstract: A method and apparatus for trimming or replacing a message that has been received and stored in a solid-state memory of a wireless voice messaging unit includes playing back and marking a selected portion representing the important information in a stored message and then replacing the entire message with the selected portion, thereby increasing the available memory space for new messages. In addition, after listening to the received and stored message the user can create his own abstract of the message that is shorter than the original. The new shorter message then replaces the original message, thereby increasing the available memory space for subsequent messages.

Abstract: Robust acoustic echo cancellation in a single-channel integrated audio and intercom system is provided by adapting echo cancellation filters in accordance with an optimized autocorrelation matrix. This is carried out in a modified FIR LMS filter in which the adaptation regressor signal is formed by a combination of one or more of the received voice signal, the received audio signal, and/or a random noise signal. In a SISO system, it is usually desirable to shelter the regressor signal from tonal components such as voice signals. In a multiple-channel system, it is usually desirable to shelter regressor signals for a particular channel from acoustic components that are likely to be correlated to acoustic components in other parts of the system and are likely to affect that particular channel. In multi-channel applications, it is therefore usually desirable to shelter regressor signals from audio signals.