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Loudspeaking telephone station including directional microphone 원문보기

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • H04M-001/20
  • H04R-001/32
출원번호 US-0455128 (1989-12-22)
발명자 / 주소
  • Baumhauer
  • Jr. John C. (Indianapolis IN) McAteer Jeffrey P. (Fishers IN) Wittman Brian A. (Indianapolis IN)
출원인 / 주소
  • AT&T Bell Laboratories (Murray Hill NJ 02)
인용정보 피인용 횟수 : 91  인용 특허 : 0

초록 ▼

A loudspeaking telephone station (speakerphone) includes a loudspeaker and one or more microphones within the same housing. The microphones are directional, each having a polar response characteristic that includes a major lobe, one or more side lobes, and nulls between pairs of lobes. The loudspeak

대표청구항 ▼

A loudspeaking telephone station comprising: microphone apparatus for converting audible sounds into electrical signals, a loudspeaker for converting electrical signals into audible sounds, and a speech network that electrically connects the microphone apparatus and the loudspeaker to a telephone li

이 특허를 인용한 특허 (91)

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