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| Number | Title | Issue Date |
| 6947757 | Method for communicating information The invention relates to communication of information in fixed-length messages in mobile communication systems, particularly in association with positioning methods. In a method according to the invention information is transferred in a fixed-length message such tha... | 09/20/2005 |
| 6356759 | Resource allocation mechanism in packet radio network In a packet radio system (e.g. a GPRS), a network (BSS) has two different alternatives for allocating a radio resource to a mobile station (MS). In a first allocation alternative the radio resource is allocated using an uplink counter block identifier (US... | 03/12/2002 |
| 6044147 | Telecommunications system An apparatus for improving signal quality in a communications link includes apparatus for regenerating only the speech-like characteristics of signals received over the communications link so that an estimate of the original speech signal can be retransmi... | 03/28/2000 |
| 5592545 | Voice enhancement system and method A telecommunications network (120) is provided with adaptive gain control (AGC) of the voice signals in network (120). Network (120)includes an input (12) for receiving a voice signal, an output (14) for receiving the voice signal, and a coupling between ... | 01/07/1997 |
| 5388185 | System for adaptive processing of telephone voice signals A system for adaptively processing a telephonic speech signal performs modification in either the spectral domain or the time domain to bring the power in each frequency above the hearing threshold of the listener but below the upper limit of the listener... | 02/07/1995 |
| 5131028 | Methods and apparatus for providing reciprocal impedance conversion A reciprocal impedance conversion network is disclosed. Such conversion network preferably is used in a reciprocal negative impedance repeater for the nonloaded cable facilities of a telephone system. Two independent voltage sources for generating recipro... | 07/14/1992 |
| 4942603 | Methods and apparatus for providing reciprocal impedance conversion A reciprocal impedance conversion network is disclosed. Such conversion network preferably is used in a reciprocal negative impedance repeater for the nonloaded cable facilities of a telephone system. Two independent voltage sources for generating recipro... | 07/17/1990 |
| 4882749 | Control of signal transmission Circuits embodying the invention include apparatus for sensing the amplitude and the frequency of the signals received from one section of a telephone cable and for propagating onto the succeeding section of telephone cable only those received signals hav... | 11/21/1989 |
| 4873502 | Negative immittance converter A negative admittance converter or a negative impedance converter can be formed from a negative immitance converter having two preferably identical transformers each having a center tapped coil and respective coil end terminals. One end of each of the coi... | 10/10/1989 |
| 4682355 | Electronic feeding bridge for a space division switching network The invention relates to a telephone subscriber electronic feeding bridge which includes a transformer with three windings, between the line of the sub set and the connection network of the telephone unit automatic exchange or autoswitch of which it forms... | 07/21/1987 |
| 4532384 | Line feed circuit including negative impedance circuit Communication lines for example telephone loop circuits are typically terminated with line feed circuits such that d.c. and a.c. terminating impedances are dissimilar. The line feed circuit includes tip and ring feed resistors of similar ohmic values for ... | 07/30/1985 |
| 4467269 | Start-up circuit for negative inductance multiplier A circuit for increasing the inductance of a transformer as used in a telephone line circuit. An operational amplifier with appropriate feedback is connected across a separate winding of the transformer to provide the reactive inductance. To compensate fo... | 08/21/1984 |
| 4463307 | Negative inductance multiplier circuit including temperature compensation A circuit for increasing the inductance of a transformer as used in a telephone line circuit. An operational amplifier with appropriate feedback is connected across a separate winding of the transformer to provide the reactive inductance. To compensate fo... | 07/31/1984 |
| 4357494 | Impedance canceller circuit An improved impedance canceller circuit, for use with two-wire transmission systems of the type encountered in telephony, is adapted to be interfaced with the wires and operates in a manner to effectively eliminate or cancel an unwanted impedance across t... | 11/02/1982 |
| 4352962 | Tone responsive disabling circuit A tone responsive disabling circuit for disabling prior to the transmission of data on a telephone transmission line a device which is connected to the line for improving voice transmission on the line. The disabling circuit operates in response to the tr... | 10/05/1982 |
| 4336423 | Device for increasing the parallel inductance of a transformer A switching network includes electronic crosspoint switches for providing electronic connection or disconnection between two voice stations. Each station is connected to the network through a line transformer. When two stations are connected to each other... | 06/22/1982 |
| 4192974 | Multi-section apparatus for improving signal transmission through telephone transmission lines An apparatus for providing simultaneously a multiplicity of independent non-interactive effects on the transmission characteristics of a voice-frequency telephone transmission line. Output voltage and current signal processing circuitry is provided which ... | 03/11/1980 |
| 4112262 | Telephone station repeater A telephone station repeater is disclosed which will provide bidirectional gain in a long telephone loop at the customer's station. The repeater is powered from the central office battery over the loop and provides gain with very small power consumption a... | 09/05/1978 |
| 4086432 | Switching circuit useful in telephone conference systems A switching circuit comprises an operational amplifier with two resistive negative feedback paths including respective unilaterally conducting devices (e.g. diodes) connected in opposite polarity to the output of the amplifier. A first terminal is connect... | 04/25/1978 |
| 4085290 | Telephone conference amplifier A telephone conference amplifier consists of a plurality of identical channels connected to a common point. Each channel includes means for deriving an envelope signal from an incoming speech signal, and means for adding the envelope signal to the incomin... | 04/18/1978 |
| 4056688 | Telephone range extender with gain A telephone Range Extender with Gain (REG) is disclosed for extending the range of loop lengths over which telephone service can be provided. This is accomplished by providing voice frequency gain, a higher voltage talking battery, and supervisory and sig... | 11/01/1977 |
| 4028505 | Negative impedance repeater for telephone lines A negative impedance repeater for amplification in telephone lines operating at voice frequency comprises two converters, one of them stable with open terminals and the other stable with short-circuited terminals; each converter is loaded by a fixed netwo... | 06/07/1977 |
| 4027118 | Network having a transformer-coupled open-circuit stable negative impedance and a short-circuit stable positive impedance A network has a transformer coupled open-circuit stable negative impedance. A positive impedance is included in the network as a shunt impedance, so as to thereby render the network both open-circuit stable as well as short-circuit stable.... | 05/31/1977 |
| 3989906 | Repeater for transmission lines A circuit for varying the amplification afforded to a-c signals transmitted through a transmission line in accordance with the length of that transmission line. Circuitry is provided which establishes a control signal which is a function of the a-c losses... | 11/02/1976 |
| 3974345 | Negative impedance repeater with double amplification, for telephone lines A repeater for telephone lines, comprising two amplifier units serially connected and joined by an artificial line, the first unit having its input terminals connected to the secondary winding of a transformer of which the primary winding serves for conne... | 08/10/1976 |
