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| Number | Title | Issue Date |
| 7286089 | Antenna unit and electrical connection device thereof and portable device having the same A portable device with a sliding variable built-in antenna is provided including a main body, a variable built-in antenna which is assembled at a predetermined location of the main body and configured to slide up/down with respect to the main body according to an an... | 10/23/2007 |
| 7257220 | Method and system for providing extended reach of a digital subscriber line signal A method for providing extended reach of a digital subscriber line signal includes receiving an incoming DSL signal, splitting the DSL signal into separate voice and data signals, demodulating the data signal, requantizing the demodulated data signal, modulating the... | 08/14/2007 |
| 7158633 | Method and apparatus for monitoring subscriber loop interface circuitry power dissipation Subscriber line interface circuitry includes an integrated circuit having sense inputs for a sensed tip signal and a sensed ring signal of a subscriber loop. The integrated circuit generates a subscriber loop linefeed driver control signal in response to the sensed ... | 01/02/2007 |
| 7120546 | Integrated spectrum analyzer for tuners A scheme to provide a spectral view of the signals present at the customer premises equipment by the network operator and includes a digital signal processor (DSP) or other signal processing apparatus integrated into a customer premises equipment (CPE) tuner in whic... | 10/10/2006 |
| 7065143 | Method and design for increasing signal to noise ratio in xDSL modems A DSL modem comprises an additional transformer and additional coils on a coupling transformer to couple a received signal on a transmission line to a receive path without loss due to an active impedance. The ratio of windings on the coils allows gain to be introduc... | 06/20/2006 |
| 7031454 | Method and apparatus for interfacing telephone apparatus to a digital, analog or hybrid telephone switching system An adaptive interface method and apparatus for interfacing a telephony appliance such as an analog telephone, modem, fax modem, facsimile machine teleconferencing device, headset, VoIP telephone or non-compatible digital telephone to a digital, analog or hybrid tele... | 04/18/2006 |
| 6829768 | Information processing method and information processing apparatus An information processing apparatus has an SDL execution unit described in a specification and description language (SDL), an external environment description unit described in a programming language other than the SDL, and an adapter having a pseudo internal signal... | 12/07/2004 |
| 6757276 | Touch tone replacement for internet telephony Tones that are generated by a telephone or PC (such as DTMF tones) and subject to loss or noise during generation or during transmission along a medium are detected and replaced with substantially noise-free and distortionless digital signals. In one embodiment, the... | 06/29/2004 |
| 6694010 | Recognition of a single frequency tone A fast-converging, computationally simple, method for recognizing a single frequency tone or a sinusoid in a signal without prior knowledge of the tone frequency. The method employs a second order or higher auto-regressive model and includes: (a) sampling... | 02/17/2004 |
| 6671375 | Telephone circuit Disclosed is a telephone circuit in which two simultaneously available telephones are connected by use of a pair of twisted-paired cables. A PBX 1 and a digital multi-function telephone 2 are connected by a pair of twisted-paired cables, a digital signal ... | 12/30/2003 |
| 6665350 | Method and system for improved analog signal detection A method and system for improved detection of analog signals, where the analog signals may be composed of one or more analog frequencies. In the method and system, an analog signal is received. A stream of data samples is created from the analog signal. B... | 12/16/2003 |
| 6628638 | Method and apparatus for receiving diversity signals for use in OFDM radio communication system A diversity receiving apparatus for use in an OFDM transmission radio communication/broadcasting system where OFDM signals are received by a plurality of antennas and input into a plurality of receivers. The OFDM received signals are further transformed i... | 09/30/2003 |
| 6353621 | Method to allow seamless service to mobile subscribers across various mobile switching centers supporting multiple intersystem standards The invention provides systems, including a methods and apparatus, for providing seamless telephone service across MSC's that support multiple or different protocols. In accordance with a preferred embodiment of the invention, the home mobile switching ce... | 03/05/2002 |
| 6185293 | Signal matching apparatus for exchanging signals between an analog switching system and a digital switching system A signal matching apparatus for exchanging signals between a digital switching system and a two-wire long distance subscriber line signal switching system comprises a first PCM equipment for converting a 4-wire E1 signal of the digital switching system in... | 02/06/2001 |
| 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 |
| 5995557 | Tone detection with aliasing bandpass filters To detect a dual tone pair signal in a telephone communication system, the signal is sampled at the Nyquist frequency. The sampled signal is filtered to determine the top three tone frequency power results. The input signal is then resampled at one-half o... | 11/30/1999 |
| 5937059 | DTMF detector for detecting DTMF signals using a digital signal processing chip and method thereof A dual tone multi-frequency detector includes a pulse code modulation expanding unit for converting pulse code modulation data into linear data. A correlating unit constructed from a plurality of correlators correlates the linear data with a plurality of ... | 08/10/1999 |
| 5878131 | Interference attenuation for acoustic-dialers Acoustic dialers are widely used to dial telephone numbers by generating a pair of DTMF tones for each key being depressed. Non-linearities in telephone systems, acoustic dialer loudspeakers, and telephone microphones may cause interfering tones to be pro... | 03/02/1999 |
| 5793862 | Information signal detection device and information signal detection method An information signal detection device and an information signal detection method are disclosed with which it is possible to transmit information by means of a DTMF signal using a channel that is prone to distortion, such as a high-efficiency channel. The... | 08/11/1998 |
| 5754635 | Apparatus and method for receiving multi-channel caller identification data An apparatus for receiving multi-channel caller identification data in a switching system with a path forming portion for forming a path to receive the caller identification data in response to an incoming ring signal from a plurality of central office li... | 05/19/1998 |
| 5715309 | Conversion of compressed speech codes between attenuated and unattenuated formats 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 trans... | 02/03/1998 |
| 5557669 | Channel interface unit A channel interface unit for interconnecting a two-wire transmission path which transmits analog signals and a digital signal transmission path. The channel interface unit includes a digital interface unit coupled with the digital signal transmission path... | 09/17/1996 |
| 5557670 | Channel interface unit A channel interface unit for interconnecting a two-wire transmission path which transmits analog signals and a digital signal transmission path. The channel interface unit includes a digital interface unit coupled with the digital signal transmission path... | 09/17/1996 |
| 5500896 | Code converter comprising protection circuit A code converter for processing switching information signals, which comprises a protection circuit for limiting a current flowing in a telephone exchange wire. The protection circuit includes an evaluation circuit, which causes a switch arranged in serie... | 03/19/1996 |
| 5467395 | Telephone exchange apparatus When there is an incoming call to a digital line and the digital line is to be connected to a digital terminal, a CPU connects the line and the terminal directly. When the digital line is to be connected to an analog individual line telephone or the like,... | 11/14/1995 |
| 5448635 | Wiring scheme and network adapter with digital and analog outputs to allow old pots coexistence with ISDN A network adapter and wiring scheme makes use of existing plain old telephone service (POTS) wiring to provide support between analog devices within the subscriber premise and an Integrated Digital Service Network (ISDN). Moreover, the network adapter and... | 09/05/1995 |
| 5386470 | Repeaters for secure local area networks A multiport repeater for a local area network installation has (in addition to its conventional functions) means for storing access rules for the items of equipment connected to it. It reads a portion of each frame, which may be all or part of the destina... | 01/31/1995 |
| 5323460 | Enhanced subscriber line interface circuit An enhanced subscriber line interface circuit for a digital switching system which includes a line configuration and protection circuit connection tot he subscriber line and to a thick-film hybrid module. The thick-film hybrid module comprises a high volt... | 06/21/1994 |
| 5305377 | Apparatus for providing an ISDN to analog interface An interface for translating signals from a ISDN terminal to an analog telephone terminal including apparatus for separating ISDN signals into control and data signals, apparatus for utilizing the control signals to generate tone signals for transfer to a... | 04/19/1994 |
| 5289538 | Circuit arrangement for signal and information conversion between analog junction lines and digital terminal devices in communications exchanges A circuit arrangement converts signals and information between analog junction lines and digital terminal devices in communications exchanges. A decentralized control device is provided in order to process and pass on switching criteria and codes received... | 02/22/1994 |
| 5177781 | Dialing pulse signature recognizing method and device A method and device for recognizing a signature of dialing pulse present in a communication signal isolate from the latter signal the signature. The so isolated signature is correlated with a statistic model obtained from a large number of dialing pulse s... | 01/05/1993 |
| 5163050 | Configurable parameter DTMF detector In a digital messaging system (10), an apparatus (37) and method for determining whether a DTMF (Dual Tone Multi Frequency) digit is present on an input signal (11,12). A heuristics engine (37) performs a series of tests on the input signal (11,12) using ... | 11/10/1992 |
| 4852160 | Channel unit interface circuit A channel unit interface circuit for interconnecting a two-wire, bidirectional signal transmitting means and a four-wire signal transmitting means in a communication system includes a tip terminal line driver, a ring terminal line driver, a voice sense am... | 07/25/1989 |
| 4652703 | Digital voice transmission having improved echo suppression A digital voice communication apparatus having improved echo suppression includes a transmission gain detection circuit for detecting a near talker signal and a receiver gain detection circuit for detecting a far talker signal. An echo detecting circuit d... | 03/24/1987 |
| 4633225 | Impedance line matching device using feedback A circuit for generating a desired two terminal impedance at the two terminals by coupling analog signals appearing at the two terminals into an analog to digital converter, supplying the output therefrom to a digital processing circuit, leading the outpu... | 12/30/1986 |
| 4598173 | Interface circuit for a subscriber line circuit An interface circuit for a subscriber line circuit employs a controllable amplifier including a switching converter. The switching converter includes a capacitor coupled across a two-wire subscriber line and supplies an auxiliary voltage to the line. The ... | 07/01/1986 |
| 4591827 | PCM coder-decoder Disclosed is a PCM coder-decoder having a construction such that a digital filter contained originally in the PCM coder-decoder is utilized on the time division basis in order to fold back a digital reception signal to a digital signal transmission side a... | 05/27/1986 |
| 4588986 | Method and apparatus for operating on companded PCM voice data A method and apparatus for digitizing audio signals being generated from a plurality of parties (A, B) in order to provide audio communication between the parties with a minimum of interference. Each of the parties has an audio transmitter and receiver (3... | 05/13/1986 |
| 4575584 | Fail-safe digital phone A fail-safe digital telephone set of the present invention is operatively connected to a digital PBX which has at least one digital telephone set attached thereto and which further interfaces with telephone lines to a central office. The fail-safe digital... | 03/11/1986 |
| 4560840 | Digital handsfree telephone In a loudspeaking telephone arrangement, there are separate channels for outgoing speech (A-Tx) and incoming speech (A-Rx), and the channels are sampled at intervals. The results of these samplings, which represent the amplitudes of the speech in those ch... | 12/24/1985 |
