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| Number | Title | Issue Date |
| 5323459 | Multi-channel echo canceler A multi-channel echo canceler for canceling echo generated as a result of propagation of 2-channel received signals, along a spatial acoustical path via a first and a second loudspeaker, from a transmitted signal containing a speech source signal received... | 06/21/1994 |
| 5297210 | Microphone actuation control system An improved automatic microphone actuation control system. The system exhibits a high degree of resistance to inappropriate secondary microphone actuation by reverberant sound, even when two or more microphones in a system are operated at significantly di... | 03/22/1994 |
| 5222084 | Echo canceler having adaptive digital filter unit associated with delta-sigma modulation circuit An echo canceler comprises an adaptive digital filter circuit for producing an echo replica signal on the basis of a transmit digital signal and a first digital signal indicative of a far-end signal, and an adder for eliminating the echo signal from a rec... | 06/22/1993 |
| 4955055 | Loudspeaking telephone with a frequency shifting circuit A loud speaking telephone has separate volume level control circuits positioned in the transmit and receive paths, respectively. The frequency is shifted in at least one of the paths to provide a signal which is less likely to produce echos or singing. A ... | 09/04/1990 |
| 4748669 | Stereo enhancement system A stereo enhancement system (300) is disclosed which provides an enhanced wider stereo image and a wider listening area, and further provides perspective correction for achieving correct stereo sound perspective with speakers at different locations and wi... | 05/31/1988 |
| 4683590 | Inverse control system An inverse control system is disclosed, which comprises FIR filters provided between transmitting elements at n (n=2, 3, . . . ) input points of a linear FIR system and a common signal source, for an inverse control such as to provide desired impulse resp... | 07/28/1987 |
| 4636586 | Speakerphone with adaptive cancellation of room echoes An arrangement for generating an electrical audio signal in response to a sound signal applied to a microphone in a reverberating room removes the reverberations with an adaptive filter. The filter learns or adapts so as to cancel the room echoes by recei... | 01/13/1987 |
| 4485484 | Directable microphone system A microphone arrangement focuses on a prescribed volume in a large room such as an auditorium. The arrangement includes a plurality of directable beam microphone structures. Each beam is directed to a prescribed location. The signals produced in the micro... | 11/27/1984 |
| 4225754 | Loudspeaker telephone A loudspeaking telephone has a differential coupler (3) connecting a two-way two-wire telephone line (4) to separate transmission and reception channels (1 and 2 respectively) including respectively a microphone (5) and a loudspeaker (7). A first transver... | 09/30/1980 |
| 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 |
| 4192979 | Apparatus for controlling echo in communication systems utilizing a voice-activated switch An apparatus for blocking the transmission of echo signals in telephone communications circuits is disclosed. The apparatus employs a voice-activated switch in the transmit channel at each telephone terminal of the telephone circuit to block transmission ... | 03/11/1980 |
| 4166924 | Removing reverberative echo components in speech signals A system is disclosed for automatically reducing reverberation in typical voice telecommunications systems. This system uses center clipping levels adaptive to the level of reverberation input speech. In one configuration, the voiceband is divided into tw... | 09/04/1979 |
| 4131760 | Multiple microphone dereverberation system A circuit for reducing reverberative interference utilizes a pair of spatially separated microphones to obtain speech signals from a common sound source. Each speech signal is transformed into an envelope representative signal having rapid increases respo... | 12/26/1978 |
| 4087633 | Dereverberation system Disclosed is a signal dereverberation system employing two spatially separated microphones. The microphones' signals are processed by first equalizing the delay in the signals applied to the microphones, and following the delay equalization, the signal ma... | 05/02/1978 |
| 4069395 | Analog dereverberation system Room reverberation characteristic of monaural systems is removed, in accordance with the principles of this invention, by employing two microphones at the sound source and by manipulating the signals of the two microphones to develop a single nonreverbera... | 01/17/1978 |
| 4066842 | Method and apparatus for cancelling room reverberation and noise pickup Room reverberation and other uncorrelated signal sources characteristic of monaural systems are removed, in accordance with the principles of this invention, by employing two microphones at the sound source and by manipulating the signals of the two micro... | 01/03/1978 |
