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| Number | Title | Issue Date |
| 7197135 | Systems and methods for caller-controlled tune notification of a call A system and method for a caller to control a tune notification for a telephone call includes a service switching point and a service control point. The service switching point is operable to receive a tune notification service access code and a called directory num... | 03/27/2007 |
| 7185127 | Method and an apparatus to efficiently handle read completions that satisfy a read request A method and an apparatus to efficiently handle read completions that satisfy a read request are presented. The apparatus comprises a first port to receive data that partially satisfies a read request, a second port, wherein the data is forwarded via the second port... | 02/27/2007 |
| 7106846 | System and method for caller control of a distinctive ring A system for a caller to control a distinctive ring for a telephone call includes a service switching point and a service control point. The service switching point is operable to receive a feature code and a called directory number, and to issue a query in response... | 09/12/2006 |
| 7000041 | Method and an apparatus to efficiently handle read completions that satisfy a read request A method and an apparatus to combine and to send data dynamically are presented. The method comprises receiving data that partially satisfies a read request from a memory in response to a request, wherein the request is from a requester. The method further comprises... | 02/14/2006 |
| 6665398 | Programmable subscriber loop interface circuit and method A subscriber loop interface circuit and method for externally programming the on-hook, off-hook, and transition states of the subscriber loop interface circuit. The circuit having an off-hook overhead sufficient for long loop applications and having a con... | 12/16/2003 |
| 5996106 | Multi bank test mode for memory devices A multiple bank memory device is described which can be tested by accessing the multiple memory banks simultaneously. The memory includes a test mode trigger which initiates a test which writes and reads from memory cells located in different memory banks... | 11/30/1999 |
| 5764755 | Ring-signal generation in a SLIC A ring generator circuit is included in a subscriber line interface circuit (SLIC) for providing a high voltage ring signal to a plurality of ringers at the same time. The ring generator circuit includes an adder and divider circuit connected to receive a... | 06/09/1998 |
| 5491746 | Unique ringing on a prime telephone A telephone switching system is comprised of a main controller, switching circuits controlled by the main controller, a peripheral controller for controlling the seizing of subscriber lines for calls routed through the switching circuits, and further comp... | 02/13/1996 |
| 5483592 | Ringer unit driving system in a subscriber transmission system In a ringer unit driving system for driving a ringer unit provided in common to a plurality of channel units, the ringer unit sends a ringing signal to a communications device via one of the channel units. A signaling bit detection unit, which is provided... | 01/09/1996 |
| 5442692 | Telecommunication system having a capability of changing the alerting tone A telecommunication system comprises a network for transmitting information, a plurality of terminals connected to the network for communicating to each other, a data base provided in the network and having a plurality of storage areas corresponding to th... | 08/15/1995 |
| 5442698 | Ringing generator for telephones A ringing generator includes a binary signal source generating a waveform with eight degrees of freedom controlled to suppress or cancel certain harmonics to produce a binary low frequency signal substantially free of low frequency components other than t... | 08/15/1995 |
| 5402480 | Call signal generating circuit A call signal generating circuit includes a step-up transformer having a primary winding and secondary windings and a first switching circuit coupled between the primary winding of the step-up transformer and a D.C. power source for turning ON/OFF at a fr... | 03/28/1995 |
| 5402484 | Telephone circuit assembly A circuit assembly which includes an interface circuit between a subscriber line and exchange devices of the kind with two amplifiers connected in a bridge configuration between the battery terminals and having a means of detecting the output currents; a ... | 03/28/1995 |
| 5335270 | Bell signal generating circuit A bell signal generating circuit for a key telephone set. A dc component of a pulse signal is removed by a photo-coupler to generate a first signal. A high frequency component of the first signal is removed by a filter to generate a second signal. A diffe... | 08/02/1994 |
| 5307407 | 20 Hz ring generator using high frequency PWM control A low frequency high voltage AC power for a telephone system is provided by a ring signal generator, which produces a ring signal from a DC power supply using a pair of switches controlled by pulse width modulation (PWM) circuit. The ring signal generator... | 04/26/1994 |
| 5295185 | Ringing signal generation circuit with protection against overvoltage A ringing signal generation circuit contains a direct current power source, a transformer, a control transistor, a rectifying and smoothing circuit, an invertor circuit, and an invertor controlling circuit. The direct current power source generates a dire... | 03/15/1994 |
| 5293420 | Ring trip circuit A first part for picking up a signal being proportional to a ringing tone signal transferred on a subscriber line; a second part for extracting an ac component from the thus picked-up signal; and a third part for receiving both the signals from the first ... | 03/08/1994 |
| 5260992 | Key telephone system with reduction of delay of ring tone generation at telephone set A plurality of trunk interface blocks are provided to receive a plurality of telephone lines. In each trunk interface block, a ringing signal detection circuit detects an incoming ringing signal on the corresponding telephone line, and a code insertion ci... | 11/09/1993 |
| 5260996 | Current limited electronic ringing generator An electronic ringing generator circuit with provision for power efficient current limiting and preservation of sinusoidal or near sinusoidal output waveform under overload conditions. A pulsewidth modulated DC-DC power convertor produces supply voltages ... | 11/09/1993 |
| 5140630 | Added main line apparatus An added main line system is disclosed with particular utility in connection with equipment for providing the services of two telephone lines on a single conductor pair. The ring generator of the added main line system has two transistor bridges, one for ... | 08/18/1992 |
| 5056135 | Method of automatic equalized distribution of ring loads for telephone exchange system A method of automatically and equally distributing the ring load for an exchange system. The subscribers are grouped so that at any one time the subscribers of one group only is supplied with the ring current for ringing the telephone. If the number of th... | 10/08/1991 |
| 4995075 | Apparatus and method for encoding telephone ringing signals An encoded telephone signalling apparatus and method provides pleasant, relatively distinct and quickly distinguishable personalized call destination information and distinctive call origin information signals within an audible ringing pattern. The ring p... | 02/19/1991 |
| 4972466 | Digital composite tone alerting Within a digital PBX system or the like, an appartaus permits provision of digital composite tone alerting particularly suitable for piezoelectric transducers with one arbitrarily selectable tone, by means of logic circuits for latching the sign-bit in a ... | 11/20/1990 |
| 4969186 | Telephone message waiting system and apparatus A system transmits information over telephone lines using ring signals. The ring signals have bursts of selectable duration separated by selectable time intervals between bursts. A ring signal translator receives the ring signals from telephone lines wher... | 11/06/1990 |
| 4962527 | Series ringing signal generator A series ringing signal generator is disclosed which comprises a source of a user control signal. A programmable ringing signal generator is provided for generating an analog sine wave signal having a selectable amplitude and frequency in response to a se... | 10/09/1990 |
| 4955053 | Solid state ringing switch A ringing switch for providing ringing voltage and tripping voltage to the cable pairs of a telephone central office. The switch synchronizes the control signal from a cadence generator with the zero crossing of the ringing voltage to ensure that the volt... | 09/04/1990 |
| 4924511 | Ring signal generator for generating ring signals of different frequencies and power levels in response to user selection A programmable ring signal generator includes a source of a user control signal. A controlled clock signal generator produces one of a set of respective clock signals responsive to the user control signal. A switched capacitor filter is coupled to the clo... | 05/08/1990 |
| 4847896 | Monolithically integratable telephone circuit for supplying ringing signals to a subscriber's telephone line and for detecting an off the hook condition during ringing A telephone circuit, which may be monolithically integrated, for supplying ringing signals to a subscriber's telephone line and for detecting an off the hook condition during ringing, including a logic control circuit connected to exchange components whic... | 07/11/1989 |
| 4821314 | Message and ringing signaling device for a telephone installation Message signaling device for a telephone installation having analog stations and station equipped for this purpose. The invention has as its objects a signaling device by light means for a telephone installation whose subscribers are equipped with analog ... | 04/11/1989 |
| 4797917 | Monolithically integratable telephone circuit for supplying ringing signals to a subscriber's telephone line and for detecting an off the hook condition during ringing A telephone circuit, which may be monolithically integrated, for supplying ringing signals to a subscriber's line and for detecting an off the hook condition during ringing includes a circuit for supplying ringing signals coupled to exchange control compo... | 01/10/1989 |
| 4748659 | Calling signal transmission apparatus In a calling signal transmitting apparatus, a ring trip equipment, including a ring trip detecting circuit for detecting a ring trip signal in response to an off-hook operation of the telephone set during a signal state of an intermittent ringing signal a... | 05/31/1988 |
| 4734936 | Ringing signal sending-out circuit A circuit for sending out a ringing signal of a high voltage and a low frequency to a telephone set through a telephone line repeatedly with a predetermined time interval. In order to omit use of a high power oscillator and relays, a D.C. power supply of ... | 03/29/1988 |
| 4734937 | Telephone installation The invention relates to an overvoltage protected high-voltage integrated circuit and a low-voltage integrated circuit with switching control for a hybrid circuit connected peripherally to a telephone exchange for serving telephone instruments. In particu... | 03/29/1988 |
| 4703500 | Power amplifier A power amplifier includes negative and positive terminals for connection across a direct current supply, an input for receiving a reference signal and an output for supplying an amplified replica of the reference signal. Positive polarity and negative po... | 10/27/1987 |
| 4656659 | Programmable ring signal generator A digitally controlled ring signal generator includes a plurality of ring signal generating sources providing a plurality of inputs to each of a plurality of ring circuits. Each input is an a.c. signal superimposed on a d.c. bias that is greater than or e... | 04/07/1987 |
| 4633040 | Personal branch exchange system A personal branch exchange telephone system including improved interface circuitry to couple the system to outside telephone lines as well as to individual telephone sets on extension lines in the PBX system. The PBX system is connected to the telephone l... | 12/30/1986 |
| 4611097 | Sine wave ring generator This invention depicts a novel sine wave ring generator for use with a telephone circuit and an input voltage having a predetermined range, the generator comprising a switching power supply for providing a pre-determined DC output voltage from the input v... | 09/09/1986 |
| 4475011 | Arrangement of interactive telephone switching processors providing selective functional capability by port A telephone switching system for telephone lines in a telephone network that carry voice and associated supervisory information signals. The voice signals are received through one of a plurality of ports under the control of a port event processor and are... | 10/02/1984 |
| 4471169 | Arrangement of interactive telephone switching processors and associated port data storage means A telephony switching system for interconnecting a plurality of telephone lines. A port storage circuit dedicates an area to each telephone line for storing status information including supervisory information and dial digit information for the correspond... | 09/11/1984 |
| 4447673 | Ring trip apparatus for a line circuit connected to DCO switch A ring trip circuit adapted for use in a community office switching system that includes a call control processor and a port event processor. The call control processor and port event processor interact through a port storage unit that contains informatio... | 05/08/1984 |
