[특허]Portable-to-portable talk system for cordless telephone

Portable-to-portable talk system for cordless telephone 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04M-011/00
출원번호	US-0875416 (1992-04-29)
우선권정보	JP-0114513 (1991-05-20)
발명자 / 주소	Hirano Masahiro (Saitama JPX)
출원인 / 주소	Pioneer Electronic Corporation (Tokyo JPX 03) Pioneer Communication Corp. (Saitama JPX 03)
인용정보	피인용 횟수 : 71 인용 특허 : 0

초록 ▼

A portable-to-portable talk system for cordless telephone. The transmitter-receiver of base unit has a control channel and a plurality of talk channels. The transmitter-receiver transmits the channel number of a vacant talk channel to a first portable unit and to a second portable unit over the control channel upon reception of a connection request from the first portable unit over the control channel. The transmitter-receiver is then switched from the control channel to the vacant talk channel after having transmitted the channel number of vacant talk channel over the control channel. Then, the receiver output of the transmitter-receiver is connected to the transmitter input. The transmitter-receiver of the portable unit has the control channel and the plurality of talk channels and transmits the connection request to the base unit over the control channel. The transmitter-receiver of portable unit is switched from the control channel to the vacant talk channel upon reception of the channel number of vacant talk channel from the base unit. A Tx/Rx selecting signal is transmitted over the vacant talk channel to other portable unit via the base unit when an operator of portable unit completes his speech. The second transmitter-receiver operates as a receiver when the Tx/Rx selecting signal is outputted from the local portable unit, and as a transmitter upon reception of the Tx/Rx selecting signal from other portable unit so that an operator is permitted to begin his speech.

대표청구항 ▼

A portable-to-portable talk system for cordless telephone where a base unit and portable units are linked via a radio transmitter-receiver, said base unit comprising: a first transmitter-receiver having a control channel and a plurality of talk channels; a portable-to-portable line setting section for causing said first transmitter-receiver to transmit a channel number of a vacant talk channel selected from said plurality of talk channels to a first portable unit and to a second portable unit over said control channel upon reception of a connection request from said first portable unit over said control channel, said portable-to-portable line setting section causing said first transmitter-receiver to switch from said control channel to said vacant talk channel after said channel number of vacant talk channel is transmitted from said first transmitter-receiver over said control channel, said portable-to-portable line setting section connecting a receiver output of said first transmitter-receiver to a transmitter input of said first transmitter-receiver after said channel number of vacant talk channel is transmitted to said first and second portable units; each of said plurality of portable units comprising: a second transmitter-receiver having said control channel and said plurality of talk channels, said second transmitter-receiver transmitting said connection request to said base unit over said control channel when requesting a connection to other portable unit, said second transmitter-receiver being switched from said control channel to said vacant talk channel upon reception of said channel number of vacant talk channel from said base unit over said control channel; A Tx/Rx selecting signal generator for generating a signal commanding a switching of said second transmitter-receiver between Tx mode and Rx, said Tx/Rx selecting signal being transmitted over said vacant talk channel to other portable unit via said base unit when an operator of portable unit completes his speech; a Tx/Rx selector for causing said second transmitter-receiver to operate as a receiver when said TX/Rx selecting signal is outputted from said TX/Rx selecting signal generator, said Tx/Rx selector causing said second transmitter-receiver to operate as a transmitter upon reception of said TX/Rx selecting signal from other portable unit via said base unit over said talk channel so that an operator is permitted to begin his speech.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

연합인증

Portable-to-portable talk system for cordless telephone 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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연합인증

Portable-to-portable talk system for cordless telephone 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

전체(0) 논문(0) 특허(0) 보고서(0)

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이 특허를 인용한 특허 (71)

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특허 원문 보기

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