公开(公告)号：EP1316088A2

公开(公告)日：2003-06-04

申请号：EP01948439.3

申请日：2001-06-19

Applicant: Andrea Electronics Corporation

Inventor： BERDUGO, Baruch

IPC: G10L21/00

CPC classification number: G10L19/0208 ,  G10L21/0208 ,  G10L2021/02168

Abstract: A noise canceling method and apparatus for canceling noise by time domain processing sub-bands of a digital input signal. The input signal (102) is divided into a number of frequency-limited time-domain sub-bands (104). Each sub-band is then individually processed in a band splitter (106) to cancel noise present in the signal. The noise processing includes exponential averaging of the input, noise estimation, and subtraction processing. The noise subtraction process is simplified by generating a filter coefficient that is exponentially smoothed, hard limited, and multiplied with the input signal to generate the noise processed output for each sub-band. The noise processed bands are then recombined in a recombiner (108) into a digital output signal (110). Implementation may be effected in software or hardware and applied to various noise canceling and signal processing application.

公开(公告)号：EP1157376A1

公开(公告)日：2001-11-28

申请号：EP00908595.2

申请日：2000-02-11

Applicant: Andrea Electronics Corporation

Inventor： MARASH, Joseph ,  BERDUGO, Baruch

IPC: G10L21/02

CPC classification number: G10L25/78 ,  G10L21/0208

Abstract: A system for cancelling and reducing an audio signal noise arising from electrical or electromagnetic noise sources such as AC to DC power converter used by computers. The system receives a digital audio signal (102) sampled at a frequency which is at least twice the bandwidth of the audio signal. The input samples are stored in a temporary buffer of 256 points (104). when the buffer is full, the new 256 points are combined in a combiner (106) with the previous 256 points to provide 512 input points which are multiplied by multiplier (108) with a shading window with the length of 512 points. The shaded results are converted to the frequency domain through an FFT processor (110). The FFT output is processed in a noise processor (112) which includes the noise magnitude estimation for each frequency bin, the substraction that estimates the noise free complex value for each frequency bin and the residual noise reduction process.

公开(公告)号：EP0792567A1

公开(公告)日：1997-09-03

申请号：EP95938910.0

申请日：1995-10-25

Applicant: ANDREA ELECTRONICS CORPORATION

Inventor： ANDREA, Douglas ,  TOPF, Martin

IPC: H04M1 ,  H04R1 ,  H04R3 ,  H04R29

CPC classification number: H04R1/1083 ,  H04M1/05 ,  H04M1/19 ,  H04M1/6008 ,  H04R1/1008 ,  H04R1/105 ,  H04R1/1066 ,  H04R3/005 ,  H04R29/006 ,  H04R2201/107 ,  H04R2201/109 ,  H04R2201/403

Abstract: A self-supporting headset (10) worn on the ear of a user without a headband (30) or placed in a stand (10 or 40) as a desktop microphone system by a switch-function (100) installed in the headset (10). The headset (10) includes a housing (20) which accommodates a receiver means (21), an arcuate earband (30) connected by a spring (90) to the housing (20) and a pivotally connected boom microphone (50) which extends from the housing (20) to near the lips of a user. The arcuate housing (30) is placed over the entire outer ear to transmit audio signals without any need for an ear tube. An earband member (40) can have a female member (15) on the bottom surface so as to connect a member to mate with a male member (15) located on the stand (10 or 40). The headset (10) can be equipped with noise cancellation technology to remove background noise for optional use on with telephones, computers, or any of the like.

公开(公告)号：EP0908018B1

公开(公告)日：2001-10-31

申请号：EP97926212.8

申请日：1997-06-23

Applicant: Andrea Electronics Corporation

Inventor： MARASH, Joseph

IPC: H04B1/12 ,  H04B1/10

CPC classification number: G10K11/341 ,  G01S7/2813 ,  G01S7/292 ,  G01S7/36 ,  G01S2007/2883 ,  H01Q3/2611 ,  H04B1/126

公开(公告)号：EP1066624A1

公开(公告)日：2001-01-10

申请号：EP99914235.9

申请日：1999-03-29

Applicant: Andrea Electronics Corporation

Inventor： ANDREA, Douglas ,  MARIANO, Joseph

IPC: G10L3/00

CPC classification number: G06F3/03543 ,  G06F3/021 ,  G06F3/16

Abstract: A remote control (400), is provided for remotely transmitting key-press signal(s) and speech signal(s) to a CPU enabled device, (200), which recognizes and interprets the speech signal(s) as commands for controlling, in accordance with the interpreted commands and the key-press signal(s), electronic(s) equipment and computer applications coupled thereto. A remote control is provided which includes a keypad having key(s) disposed on the remote control that generates key-press signal(s) in response to keypad presses. A microphone (402), coupled to the remote control receives speech and converts the speech signal(s). A transmitter is provided for transmitting the key-press signal(s) of the keypad and the speech signal(s) of the microphone to the CPU enabled device. In a preferred mode, the CPU enabled device provides speech recognition for recognizing and interpreting the speech signal(s) as speech commands and a controller for controlling, in accordance with the key-press signal(s) and the speech commands, the functions and applications, including internet applications, of electronic(s) equipment coupled thereto including a television, a telephone, a VCR, a stereo and a computer.

公开(公告)号：EP1012824A1

公开(公告)日：2000-06-28

申请号：EP98910392.4

申请日：1998-03-13

Applicant: ANDREA ELECTRONICS CORPORATION

Inventor： ANDREA, Douglas

IPC: G10K11/16

CPC classification number: G10K11/178 ,  A61F2011/145 ,  G10K2210/1081 ,  G10K2210/3027 ,  G10K2210/3213 ,  G10K2210/503

Abstract: An universal active noise reduction apparatus having a headset and a separate electronic sound module, comprising the headset having a housing, whereby the housing having a headband with a first end and a second end; a plurality of earcups having a microphone means for detecting noise signal and a speaker means for receiving audio signals attached to both ends of the headband; electronic connecting means having a first end and a second end, whereby the first end of the electronic connecting means extends from at least one earcup of the headband; an adapter connected to the second end of the electronic connecting means, whereby a plurality of male jacks for transmitting the audio signal protrude from the adapter; the electrical sound module containing a noise reduction circuitry means and an amplifier means, whereby the electrical sound module has at least a plurality of female members that interface with the male jacks of the adapter when inserted into the module for transmitting sound means; and optionally a switch means located on the electrical sound module that activates the active noise reduction circuitry means to cancel background noise prior to being transmitted to a ear of the wearer.

公开(公告)号：EP0932967A1

公开(公告)日：1999-08-04

申请号：EP97911029.0

申请日：1997-10-17

Applicant: ANDREA ELECTRONICS CORPORATION

Inventor： ANDREA, Douglas

IPC: H04M1

CPC classification number: H04M1/19

Abstract: A cellular telephone (8) for reducing background noise includes a housing having a receiver portion and a speaker portion. The receiver portion has a voice port (13) and a noise port (10). A microphone isolator (9) is located within the receiver portion and at least one noise cancelling microphone (12) has a front end and back end enclosed by the microphone isolator (9). A windscreen (14) is placed in front of the microphone internally behind the voice port (13). The telephone includes an acoustical port (15) which permits a pressure gradient noise porting, placed at the back end of the microphone and internally behind the noise port.

公开(公告)号：EP0792568A1

公开(公告)日：1997-09-03

申请号：EP95940696.0

申请日：1995-11-14

Applicant: ANDREA ELECTRONICS CORPORATION

Inventor： ANDREA, Douglas ,  TOPF, Martin

IPC: G10K11 ,  G10L21 ,  H04B15 ,  H04M1 ,  H04R1 ,  H04R3 ,  H04B1 ,  H04R29

CPC classification number: H04M1/6008 ,  H04B1/12 ,  H04M1/05 ,  H04M1/19 ,  H04R1/1083 ,  H04R3/005 ,  H04R3/02 ,  H04R29/006 ,  H04R2201/107 ,  H04R2201/403

Abstract: Apparatus for reducing acoustic background noise for use with a telephone handset (10) or a boom microphone device (100) or a boom headset (401) or the like. The apparatus includes first (12) and second (14) microphones which are arranged such that the first microphone (12) receives a desired speech input and the background noise present in the vicinity of the speech, and the second microphone (14) receives substantially only the background noise. The background noise from the second microphone (14) is converted into a corresponding electrical signal and substracted (16) from a signal corresponding to the speech and background noise obtained from the first microphone (12) so as to produce a signal representing substantially the speech.