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| Number | Title | Issue Date |
| 7366294 | Communication system tonal component maintenance techniques An apparatus and method for suppressing noise is presented. The apparatus may utilize a filter bank of bandpass filters to split the input noisy speech-containing signal into separate frequency bands. To determine whether the input signal contains speech, DTMF tones... | 04/29/2008 |
| 6516027 | Method and apparatus for discrete multitone communication bit allocation A method and apparatus for allocating bits to subchannels in a discrete multitone environment. The method employs the use of precalculated and prestored look-up tables which take into account a desired bit error rate, signal-to-noise ratio gap for a parti... | 02/04/2003 |
| 4803487 | Portable communications receiver with separate information presentation means A personal message receiving apparatus is described including a portable communications receiver, intended to be carried by the user, which receives, detects and stores messages transmitted on a first radio frequency communication channel. The stored mess... | 02/07/1989 |
| 4792970 | Expansion port for use in a communication system A system for expanding the number of signal ports accommodated by a base communication system having one or more switching circuits for interconnecting a plurality of local signal ports via a multiple line signal bus under control of a central controller.... | 12/20/1988 |
| 4731823 | Apparatus and method related to communicating analog signals between different local access transport areas To convert an analog communication between two local access transport areas (LATA's) from one charged at multiple inter-LATA rates to one charged at a single inter-LATA rate plus lower intra-LATA rates, the communication is concentrated within the remote ... | 03/15/1988 |
| 4700381 | Circuit arrangement for centrally-controlled telecommunications exchange systems, comprising central control units and an alternate circuit arrangement Two parallel-operated control units each communicate via a respective discrete bus with a respective assigned group of switch devices, and given an alternate circuit based on one control unit simultaneously accepting the tasks for both groups, an alternat... | 10/13/1987 |
| 4633042 | Electronic micro-controller conversion module for step by step switching apparatus An improved step-by-step switch assembly includes an electronic controller conversion module. A programmed microprocessor responds to incoming pulse trains of widely variant make and break ratios and generates precisely timed and shaped pulses to operate ... | 12/30/1986 |
| 4278843 | Two-way amplifier arrangement A two-way amplifier arrangement which automatically controls current flowing in the transmission circuits to maintain that current at a fixed level. The two-way amplifier arrangement finds utility as a conference amplifier and as a two-way trunk amplifier... | 07/14/1981 |
| 4197429 | Gain-adjusting conference circuit A conference circuit (150) is disclosed for use in a telephone switching system (100) to provide communication among three or more subscriber stations (101, 102, 103). The subscriber stations (101, 102, 103) are connected to a plurality of ports (P0, P1, ... | 04/08/1980 |
| 4150260 | Subscriber's circuit for four-wire-system local switch A subscriber's circuit for a four-wire-system local switch is provided with a two-wire/four-wire hybrid circuit that includes a two-wire/four-wire converter circuit. Connected between the converter circuit and a time-division switch section is an incoming... | 04/17/1979 |
| 4147900 | Telephone network protective coupler A telephone network protective coupler for connecting terminal equipment to a telephone central office by means of a telephone line. The coupler includes two hybrid circuits which are interconnected to form a transmitting path and a receiving path. A powe... | 04/03/1979 |
| 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 |
| 3991279 | Monobus interface circuit In order to reduce the signal loss in a telephone line switching and conferencing system there is interposed between each line and the switching matrix a monobus port circuit arranged to convert a transmitted telephone signal into an equivalent current so... | 11/09/1976 |
