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| Number | Title | Issue Date |
| 8160241 | Communication terminal device with echo canceller and its echo canceling method An uncomfortable feeling due to lack of the speech of a far end speaker and a convergence signal voice (sound) is prevented, and the echo of the far end speaker is removed. A pseudo signal generating circuit has a phase inverter (10) for inverting the phase o... | 04/17/2012 |
| 7151828 | Circuit arrangement for the analogue suppression of echoes A circuit arrangement for the analogue suppression of echoes, as in particular can be used in a hybrid-circuit for DSL-transmission systems, comprises a replica (8) for emulating the behaviour of the transmission line (17). In addition, a circuit (3... | 12/19/2006 |
| 7062040 | Suppression of echo signals and the like In a microphone signal, the signal component corresponding to, e.g., echo is suppressed using an echo control scheme that estimates the spectral envelope of the echo signal, without having to estimate the waveform for the echo signal. In one embodiment, the input si... | 06/13/2006 |
| 6959167 | Noise-level adaptive residual echo suppressor An improved echo control system has an adaptive controlled echo canceling filter arrangement in which a background filter updates the filter coefficients of an echo shaping filter responsive to a normalized least mean square (NLMS) algorithm. An adaptive control mod... | 10/25/2005 |
| 6912474 | Method and apparatus for high-speed synchronous digital acquisition derived in real -time from analog samples A method and apparatus for real-time derivation of precise digital clock edges and synchronous logic samples from a digital signal having a clock channel and at least one data channel acquires a plurality of temporally offset analog samples during each of a sequence... | 06/28/2005 |
| 6836544 | Sidestone reduction in full duplex transceivers A method and apparatus enables echo reduction in a full duplex transceiver system. A replica current is subtracted from a receiver via a first differential circuit path that adaptively matches a time constant associated with a second differential circuit path that c... | 12/28/2004 |
| 6744884 | Speaker-phone system change and double-talk detection A speaker-phone that is operable to perform system change detection, double-talk detection and if desired, optimal step-size control. The invention differentiates between system change and double-talk and is operable to these two situations differently. The inventio... | 06/01/2004 |
| 6611601 | Echo sound signal suppressing apparatus An echo sound signal suppressing apparatus for suppressing an echo sound signal to ensure speech communication between a far-end speaker and a near-end speaker, comprising: first power value calculating means for calculating the power value of the second ... | 08/26/2003 |
| 6487178 | Methods and apparatus for providing volume control in communicating systems including a linear echo canceler In handsfree communications devices including a linear echo or noise canceler, both analog and digital gain factors are adjusted in response to user volume control inputs, the analog gain factor being frozen during active communications (e.g., during tele... | 11/26/2002 |
| 6339642 | Telephone apparatus with howling prevention function A telephone apparatus having a howling preventing function is connected to a communication partner via a telephone exchange and is constructed by a communication unit, including a microphone and a speaker, for communicating with the communication partner,... | 01/15/2002 |
| 6278785 | Echo cancelling process with improved phase control An echo is cancelled from a composite signal by providing a coarse phase adjustment, a fine phase adjustment, an amplitude correction, and then subtracting the phase shifted signal from the composite signal. In the coarse adjustment, the phase is slightly... | 08/21/2001 |
| 6157680 | Audio distortion canceler method and apparatus In a communications environment where it is desirable to allow the simultaneous transmission of digital data and conventional voice on a single communication line, an audio distortion canceler method and apparatus is configured to adaptively cancel the no... | 12/05/2000 |
| 5943319 | Packet format interface for telecommunication instruments Improved telecommunication apparatus is realized with a structure that is tailored to interact with the telecommunication network strictly in packet format. The apparatus includes circuitry for creating either control or information packets, where each pa... | 08/24/1999 |
| 5691978 | Self-cancelling full-duplex RF communication system A method is presented herein whereby both transceivers of a full-duplex RF communications system can use the same spectrum at the same time. Self-interference is cancelled using a combination of antenna placement, analog RF suppression, and digital adapti... | 11/25/1997 |
| 5504778 | Analog circuit for baseband modem So as to be directly connected to the predefined logic circuit PLC to form a baseband modem, the analog circuit BBAC is monolithically integrated in accordance with the CMOS technology, using switched-capacitor filters which are driven by only one clock. ... | 04/02/1996 |
| 5381475 | Arrangement for suppressing echoes in a digital portable telephone An echo suppression arrangement for use in a digital portable telephone prevents sidetone echo appearing in the base unit of the telephone from being coupled to and emanating at the handset unit of the telephone. The echo suppression arrangement determine... | 01/10/1995 |
| 5323458 | Echo cancellation in a full-duplex speakerphone A direct-path echo cancellation circuit includes a loudspeaker (12), first and second microphones (14, 16), and an in-phase signal cancellation circuit (21, 43). The first and second microphones (14, 16) are positioned adjacent the loudspeaker (12) in ord... | 06/21/1994 |
| 5206854 | Detecting loss of echo cancellation In a full-duplex modem, correlation of an echo estimate signal with an echo-canceled signal is used to determine the presence or absence of a remote signal.... | 04/27/1993 |
| 5204894 | Personal electronic directory A central office based service and apparatus whereby personal electronic directory (PED) subscribers may call a special number from any DTMF telephone to access their personal directory. Such users dial a special telephone number, enter their personally s... | 04/20/1993 |
| 5148427 | Non-linear echo canceller A method and apparatus for echo cancelling linear and nonlinear echo components from a received signal by temporally and spatially separating the overall echo canceller into a fast, transversal filter based linear echo canceller which quickly cancels the ... | 09/15/1992 |
| 5084866 | Transversal filter echo canceller A transversal filter apparatus having a shift register, an averaging circuit for averaging data stored in sequential shift registers, and a multiplier for multiplying the averaged data. Additionally, a method and apparatus for echo cancelling a transhybri... | 01/28/1992 |
| 5075687 | Echo suppression with both digital and analog variable attenuators An apparatus for effecting echo suppression facilitating communications between an analog device and a digital device comprising a transmit circuit for processing outgoing signals, a receive circuit for processing incoming signals, and a control circuit f... | 12/24/1991 |
| 5022074 | Digital echo suppressor A digital echo suppression circuit in a four-wire digital telephony circuit having an echo from a local or remote connection to a two-wire circuit or other echo source. The invention incorporates a simple method of using the sample pairs from the first an... | 06/04/1991 |
| 5016271 | Echo canceler-suppressor speakerphone An echo canceler-suppressor speakerphone arrangement effectively addresses the limitations of regeneration and reverberant return echo inherent in the design of speakerphones. The tendency for regeneration is eliminated by employing adaptive echo cancella... | 05/14/1991 |
| 4972406 | Echo canceller An echo canceller (1) for full duplex digital data transmission in a transmitter/receiver unit when connected via a hybrid circuit (2) to one end of a two wire line (3). In order to provide adequate cancellation at a line data rate of 160 kbit/s over 7-8 ... | 11/20/1990 |
| 4928308 | Echo canceller circuit An echo canceller circuit contains a network of capacitors binary-stepped in their capacitance, whose one set of plates, representing a center of the network, each are switchably connectable to a reference potential or, in the case of less significant bit... | 05/22/1990 |
| 4891801 | Terminal for the transmission of data over a bidirectional analog channel with echo cancellation controlled by the reception rate A terminal is provided for transmitting data over a bidirectional analog channel with echo cncellation coupled to the reception timing, wherein, between an emission circuit and a reception circuit coupled to a bidirectional line by a hybrid coupler, an ec... | 01/02/1990 |
| 4696015 | Echo correction especially for television broadcast systems Echo cancellation is carried out on a received demodulated analog signal. The apparatus comprises an analog transversal filter, a computing circuit for generating the direct coefficients a1 to ar and, eventually, feedback coefficients b2 to bm of an analo... | 09/22/1987 |
| 4368360 | Adaptive control type echo suppressor An adaptive control type echo suppressor which compares the levels of voice signals of sending and receiving paths by a first comparator with each other and cuts off the sending path to suppress an echo when the level of the voice signal of the receiving ... | 01/11/1983 |
| 4215252 | Video teleconference audio echo control unit An audio echo control unit for a video teleconference system is provided with a suppression attack time which is a function of the microphone-to-audio speaker distance and a suppression hangover time which is a function of the room characteristics. Echo w... | 07/29/1980 |
| 4081616 | Method of and apparatus for eliminating the side tone of a telephone station Method and apparatus for use in telephone exchanges, such as time division multiplex exchanges, for eliminating the side tone of a telephone station by interruption of a restored input signal to a hybrid circuit thereof. A sampled signal is provided to a ... | 03/28/1978 |
| 4031338 | Echo suppressor using frequency-selective center clipping An echo suppressor for use in the send path of the four-wire part of a long distance telephone circuit employs frequency-selective center clipping. The bandwidth of the channel in which echo occurs is subdivided in contiguous bands or subchannels by appro... | 06/21/1977 |
| 4012603 | Echo suppressor having self-adaptive means An echo suppressor employed in systems interconnecting a two-wire circuit with a four-wire circuit for substantially eliminating "talker's echo" and for selectively attenuating the calling party's voice signal when the called party at the two-wire line be... | 03/15/1977 |
| 4005277 | Echo controller comprising a mode switch for switching echo suppressor and canceller An echo controller comprises a parallel circuit of an echo suppressor and a self-adaptive echo canceller near an echo path of a long-distance telephone network. The echo controller further comprises a mode switch responsive to levels of a received signal,... | 01/25/1977 |
| 3935403 | Device for developing a neutralization signal for an echo suppressor The invention comes within the branch of digital data transmission on a telephone line having four wires comprising echo suppressors. In order to be able to neutralize these suppressors during a simultaneous bilateral data transmission, a neutralization s... | 01/27/1976 |
