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Noise-reduction system 원문보기

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • H04B-015/00
출원번호 US-0047556 (1993-02-23)
발명자 / 주소
  • Yang Jin (Vancouver WA) Sendyk Andrew (Calgary CAX)
출원인 / 주소
  • NovAtel Communications Ltd. (Calgary CAX 03)
인용정보 피인용 횟수 : 64  인용 특허 : 0

초록 ▼

A noise-suppression circuit (10) divides the signal from a microphone (12) into a plurality of frequency sub-bands by means of a noise-band divider (18) and a subtraction circuit (36). By means of gain circuits (32) and (34), it applies separate gains to the separate bands and then recombines them i

대표청구항 ▼

For reducing the noise content of a sampled input signal consisting of a sequence of input samples, a noise-reduction circuit comprising: A) a speech detector for determining whether the input signal includes speech and generating a speech-detector output that indicates whether speech is present or

이 특허를 인용한 특허 (64)

  1. Nongpiur, Rajeev; Hetherington, Phillip A., Adaptive filter pitch extraction.
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  2. Nongpiur, Rajeev; Heterington, Phillip A., Advanced periodic signal enhancement.
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  3. Marumoto, Toru, Apparatus and method for correcting a speech signal for ambient noise in a vehicle.
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  4. Martin Rainer (Aachen DEX), Apparatus for improving disturbed speech signals.
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  5. Kosek, Daniel A.; Maher, Robert Crawford, Audio spectral noise reduction method and apparatus.
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  6. Kawashima, Takuya; Ehara, Hiroyuki, Audio switching device and audio switching method that vary a degree of change in mixing ratio of mixing narrow-band speech signal and wide-band speech signal.
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  7. Endo, Kaori; Ota, Yasuji; Otani, Takeshi; Togawa, Taro, Communication apparatus for adjusting a voice signal.
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  8. Chandran, Ravi; Marchok, Daniel J.; Dunne, Bruce E., Communication system tonal component maintenance techniques.
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  9. Chandran,Ravi; Marchok,Daniel J.; Dunne,Bruce E., Communication system tonal component maintenance techniques.
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  10. Kozel,David; Devault,James A.; Birr,Richard B., Communication system with adaptive noise suppression.
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  11. Magee, David Patrick; Hosur, Srinath, Decimated noise estimation and/or beamforming for wireless communications.
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  12. Marash Joseph,ILX, Dual-processing interference cancelling system and method.
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  13. Droppo, James G.; Acero, Alejandro; Deng, Li, Including the category of environmental noise when processing speech signals.
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  14. Finn, Brian M.; Nowak, Michael P., Integrated vehicle voice enhancement system and hands-free cellular telephone system.
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  15. Kisel, Michael; Jenkins, Tim; Cardamore, Dan; Roy, Giles; van der Veen, Peter, Media processing system having resource partitioning.
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  16. Chandran, Ravi; Marchok, Daniel J.; Dunne, Bruce E., Method and apparatus for adaptively suppressing noise.
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  17. Jelinek, Milan, Method and device for speech enhancement in the presence of background noise.
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  18. Vis Marvin L. ; Bayya Aruna, Method and system for adaptive filtering of speech signals using signal-to-noise ratio to choose subband filter bank.
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  19. Hermansky Hynek ; Avendano Carlos M., Method and system for adaptive speech enhancement using frequency specific signal-to-noise ratio estimates.
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  20. Bayya Aruna ; Vis Marvin L., Method and system for region based filtering of speech.
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  21. Chan Joseph,JPX ; Nishiguchi Masayuki,JPX, Method based on pitch-strength for reducing noise in predetermined subbands of a speech signal.
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  22. Filiz Basbug Ertem ; Srinivas Nandkumar ; Kumar Swaminathan, Method of noise reduction for speech codecs.
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  23. Nongpiur, Rajeev; Hetherington, Phillip, Multi-channel periodic signal enhancement system.
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  24. Van Acker, Kathleen Peggie Florimond; Leus, Geert Jozef Thérèse; Moonen, Marc Suzanne Paul; Pollet, Thierry; Van de Wiel, Olivier René Christian, Multicarrier receiver.
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  25. Katayanagi Keiichi (Kanagawa JPX) Nishiguchi Masayuki (Kanagawa JPX), Noise reducing method, noise reducing apparatus and telephone set.
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  26. Furuta, Satoru; Takahashi, Shinya, Noise reduction device and noise reduction method.
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  27. Pelaez Ferrigno Clara S. (Cava Del Tirreni ITX), Noise reduction method and filter for implementing the method particularly useful in telephone communications systems.
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  28. Furuta, Satoru; Takahashi, Shinya, Noise suppression device.
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  29. Furuta, Satoru; Takahashi, Shinya, Noise suppression device.
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  30. Furuta,Satoru; Takahashi,Shinya, Noise suppression device including subband-based signal-to-noise ratio.
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  31. Isabelle Steven H., Noise suppression for low bitrate speech coder.
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  32. Mauro Anthony P., Noise suppression system and method.
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  33. Sugiyama, Akihiko; Kato, Masanori, Noise suppression using integrated frequency-domain signals.
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  34. Zack Rafael,ILX, Noise suppressor having weighted gain smoothing.
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  35. Zack Rafael,ILX, Noise suppressor having weighted gain smoothing.
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  36. O'Gwynn David C., Order point communication system and method.
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  37. Giesbrecht, David; Hetherington, Phillip, Periodic signal enhancement system.
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  38. Nongpiur, Rajeev; Giesbrecht, David; Hetherington, Phillip, Periodic signal enhancement system.
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  39. Nongpiur, Rajeev; Giesbrecht, David; Hetherington, Phillip, Periodic signal enhancement system.
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  40. Mokbel Chafic,FRX ; Jouvet Denis,FRX ; Monne Jean,FRX, Process and system of adaptive filtering by blind equalization of a digital telephone signal and their applications.
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  41. Kisel, Michael, Processing system having a partitioning component for resource partitioning.
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  42. Kisel, Michael, Processing system having memory partitioning.
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  43. Kisel, Michael, Processing system having memory partitioning.
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  44. Nemer,Elias J., Reducing acoustic noise in wireless and landline based telephony.
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  45. Nemer,Elias J., Reducing acoustic noise in wireless and landline based telephony.
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  46. Taylor, Norrie, Remote control server protocol system.
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  47. Garner,Philip; Fukada,Toshiaki; Komori,Yasuhiro, Signal detection using maximum a posteriori likelihood and noise spectral difference.
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  48. Gustafsson Harald,SEX ; Claesson Ingvar,SEX ; Nordholm Sven,SEX, Signal noise reduction by spectral subtraction using linear convolution and casual filtering.
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  49. Harald Gustafsson SE; Ingvar Claesson SE; Sven Nordholm SE, Signal noise reduction by spectral subtraction using spectrum dependent exponential gain function averaging.
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  50. Handel Peter,SEX, Spectral subtraction noise suppression method.
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  51. Rajan,Jebu Jacob, Speech processing system.
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  52. Rajan,Jebu Jacob, Speech processing system.
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  53. Rajan,Jebu Jacob, Speech processing system.
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  54. Katayanagi Keiichi,JPX ; Odaka Kentaro,JPX ; Nishiguchi Masayuki,JPX, Speech signal transmitting and receiving apparatus with noise sensitive volume control.
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  55. Norman Charles P. ; Cahn Charles R., Strong signal cancellation to enhance processing of weak spread spectrum signal.
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  56. Norman,Charles P.; Cahn,Charles R., Strong signal cancellation to enhance processing of weak spread spectrum signal.
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  57. Nongpiur, Rajeev; Hetherington, Phillip A., Sub-band periodic signal enhancement system.
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  58. Marash, Joseph; Berdugo, Baruch, Super directional beamforming design and implementation.
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  59. Marash Joseph,ILX, System and method for adaptive interference cancelling.
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  60. Horowitz, Ronald J., System and method for improved loudspeaker functionality.
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  61. Joseph Marash IL; Baruch Berdugo IL, System, method and apparatus for cancelling noise.
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  62. Imai Yukihiro,JPX, Telecommunication apparatus capable of controlling audio output level in response to a background noise.
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  63. Hashimoto Kazuya,JPX, Telephone having a speech ban limiting function.
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  64. Hashimoto Kazuya,JPX, Telephone having a speech band limiting function.
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