Class 379/388.07 - Controlling acoustic feedback

Subclass of Class 379 - Telephonic communications
Definition: Subject matter in which the return path of sound signal
No. of patents: 28
Last issue date: 08/16/2011

Number	Title	Issue Date
8000466	Method and apparatus for multiparty collaboration enhancement A telecommunications system includes a network; a plurality of user devices operably coupled to said network and including a microphone and a speaker; a collaboration server configured to cause a playing of one or more test tones at said plurality of user devices an...	08/16/2011
7734034	Remote party speaker phone detection A system and method are provided for detecting acoustic echo in a telecommunications transmission. Detected acoustic echo is analyzed to determine if the acoustic echo includes characteristics indicative of use of a speakerphone by a remote party. Specific character...	06/08/2010
7330739	Method and apparatus for providing a sidetone in a wireless communication device A wireless communication device is disclosed that provides a sidetone to the device user. The device converts an outbound analog audio signal to an outbound audio bitstream from which a sidetone bitstream is extracted. The device also converts an inbound digital aud...	02/12/2008
7263184	Method and apparatus for active reduction of speakerphone singing In a speakerphone device identification of signals (i.e., voice input or speaker output) in a process for reducing acoustic feedback, in a communication device, is accomplished by adding a signature noise (i.e., an identification mark) to output signals radiated by ...	08/28/2007
7092513	Limiting maximum gain in duplex communications devices including telephone sets Duplex communication methods and systems with maximum gain limiting such as in telephone handsets and speaker phones are disclosed. The communications system such as a telephone set may generally include a digital signal processor (DSP) having a receive and transmit...	08/15/2006
7075921	Remote media control for voice over internet telephony and related applications A person receiving a Voice over IP call, such as a call center agent, remotely controls media settings on a caller's multimedia terminal device functioning as a telephone terminal device. In some embodiments, the call center agent may remotely control media settings...	07/11/2006
7031455	Use of handset microphone to enhance speakerphone loudspeaker performance A speakerphone incorporates a portion defining a loudspeaker cavity, the cavity containing a loudspeaker. The speakerphone also includes a handset with an internal microphone in the handset. The speakerphone has a housing adapted to receive the handset, and when it ...	04/18/2006
6947773	Method and apparatus for reducing echo feedback in a communication system A method and apparatus for reducing echo feedback in a wireless communication system (10) is accomplished when a receiving communication unit (24) senses a feedback signal, or echo, via an ancillary communication path. The receiving communication unit ...	09/20/2005
6925172	Line interface with gain feedback coupled matching impedance A transceiver system is disclosed for use in a telecommunication system. The transceiver system includes a transmission circuit including a transmitter input coupled to an input of a transmission amplifier, a receiver circuit including a receiver output coupled to a...	08/02/2005
6771769	Method and apparatus for active reduction of speakerphone singing In a speakerphone device identification of signals (i.e., voice input or speaker output) in a process for reducing acoustic feedback, in a communication device, is accomplished by adding a signature noise (i.e., an identification mark) to output signals radiated by ...	08/03/2004
6741874	Method and apparatus for reducing echo feedback in a communication system A method and apparatus for reducing echo feedback in a wireless communication system (10) is accomplished when a receiving communication unit (24) senses a feedback signal, or echo, via an ancillary communication path. The receiving communication unit ...	05/25/2004
6618481	Method for improving acoustic sidetone suppression in hands-free telephones A method for improving acoustic sidetone suppression in hands-free telephones, in particular for use in motor vehicles, is described. The telephone has a level discriminator and a plurality of adaptive echo compensation filters each processing a subband. ...	09/09/2003
6590974	Howling controller A digital signal processing algorithm to cancel howling in a telephone circuit, the telephone circuit being characterized by a receive path and a transmit path in an effective closed loop configuration. The algorithm monitors input samples taken from the ...	07/08/2003
6381312	Acoustic communication terminal apparatus and recording medium for storing a control program therefor An acoustic communication terminal apparatus for performing data communication over a telephone line by using an acoustic coupler has an error number counter for counting the number of errors occurring during communication. With a control signal based on ...	04/30/2002
6339641	Telephone device In a facsimile machine 1, when the speakerphone key 14 is depressed (S1: YES) and a call signal from some other telephone is not arriving to the facsimile machine 1(S2: NO), a speaker 26 is made ON and the microphone M is made OFF (S3). When at least one ...	01/15/2002
5894513	Hands-free communication unit having residual acoustic echo suppression means for suppressing residual echoes which have been left unremoved by an echo canceller, a bilateral communication system and a method for suppressing residual echoes An acoustic echo suppression circuit is provided in a hands-free communication unit. The suppression circuit includes a variable loss circuit which is responsive to noise detection circuits. If the acoustic echo canceler fails to remove all environmental ...	04/13/1999
5867573	Telephone handset interface with feedback control A telephone handset interface reduces or eliminates feedback induced singing in a telephone handset/hybrid loop. The interface provides for user selectable volume control settings, each setting representing an amount of gain or loss to be applied to the t...	02/02/1999
5664019	Systems for feedback cancellation in an audio interface garment An audio interface garment includes systems for attenuating the influence of sound waves generated by audio output devices on output signals from a plurality of input devices an. In one embodiment, input signals which are applied to the audio output devic...	09/02/1997
5406622	Outbound noise cancellation for telephonic handset A telephone handset outbound noise canceller uses an omnidirectional reference microphone placed near the transmitter grille. Two adaptive filters are employed, one driven by the handset transmitter to subtract speech from a reference value to produce an ...	04/11/1995
5381473	Noise cancellation apparatus Apparatus for reducing acoustic background noise for use with a telephone handset or a boom microphone device or the like. The apparatus includes first and second microphones which are arranged such that the first microphone receives a desired speech inpu...	01/10/1995
5010570	Method for active feedback suppression A process to reduce the howl condition in a radiotelephone when the microphone picks up audio from the speaker. The condition is detected by first lowering the speaker volume (103) and measuring the microphone volume for a corresponding decrease (104). Th...	04/23/1991
4835484	Gain control circuit for suppressing Larsen effect in a loudspeaker telephone A gain control circuit (10) of an amplifier (3) for listening via a loudspeaker (4) in an apparatus, more specifically a telephone set, which includes a microphone (1), in order to suppress the Larsen effect. The gain control circuit comprises first contr...	05/30/1989
4691336	Telephone test set having an auxiliary amplifier and speaker for permitting listening to line signals An improved telephone test unit is disclosed which permits the telephone line technician to selectively choose the audio reproduction of signals ocurring on the line without the use of the handset in the test unit. An auxiliary amplifier is provided to am...	09/01/1987
4675901	Automatic disconnect device with protected ringer An automatic disconnect device with a protected ringer for providing a secure telephone system, the device being interposed between the telephone company outlet and a modified telephone set. The device generates its own audible tone burst only when a stan...	06/23/1987
4485272	Acoustic feedback cancelling electro-acoustic transducer network An electroacoustic transducer apparatus which prevents oscillations as a result of acoustic coupling between an acoustic-wave transmitter and a receiver. The transmitter and receiver each comprise an electro-acoustic transducer network. The transducers in...	11/27/1984
4309573	Loudspeaking substation circuit An improved loudspeaking substation circuit employing a dual-tone multi-frequency signal generator wherein output tone levels are regulated by the substation transmission circuit when operating in either a loudspeaker or handset mode. The circuit further ...	01/05/1982
3975588	Acoustic feedback control An acoustic feedback control to be installed in every extension provided with a loud speaker and a microphone in a digital telephone system. Each extension is provided with a coder and a decoder of the syllabic compression type which therefore have quanti...	08/17/1976
3944743	Method and apparatus for feedback suppression A system for suppressing positive feedback in acoustical-electrical devices having acoustic or electric feedback paths or a combination of both. Electrical signals from a microphone are transmitted through a sampling switch to a signal storage device. The...	03/16/1976

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Class 379/388.07 - Controlling acoustic feedback