JPH0533851B2 - - Google Patents

Info

Publication number
JPH0533851B2
JPH0533851B2 JP61299246A JP29924686A JPH0533851B2 JP H0533851 B2 JPH0533851 B2 JP H0533851B2 JP 61299246 A JP61299246 A JP 61299246A JP 29924686 A JP29924686 A JP 29924686A JP H0533851 B2 JPH0533851 B2 JP H0533851B2
Authority
JP
Japan
Prior art keywords
voltage
microphone
output
microphone unit
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP61299246A
Other languages
English (en)
Japanese (ja)
Other versions
JPS63151119A (ja
Inventor
Yukio Murata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Priority to JP61299246A priority Critical patent/JPS63151119A/ja
Priority to US07/132,480 priority patent/US4922547A/en
Priority to EP87310974A priority patent/EP0272068B1/en
Publication of JPS63151119A publication Critical patent/JPS63151119A/ja
Publication of JPH0533851B2 publication Critical patent/JPH0533851B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H04M1/6041—Portable telephones adapted for handsfree use
    • H04M1/605—Portable telephones adapted for handsfree use involving control of the receiver volume to provide a dual operational mode at close or far distance from the user

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Transmitters (AREA)
JP61299246A 1986-12-15 1986-12-15 プレス検出回路 Granted JPS63151119A (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP61299246A JPS63151119A (ja) 1986-12-15 1986-12-15 プレス検出回路
US07/132,480 US4922547A (en) 1986-12-15 1987-12-14 Microphone circuit
EP87310974A EP0272068B1 (en) 1986-12-15 1987-12-14 Microphone circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61299246A JPS63151119A (ja) 1986-12-15 1986-12-15 プレス検出回路

Publications (2)

Publication Number Publication Date
JPS63151119A JPS63151119A (ja) 1988-06-23
JPH0533851B2 true JPH0533851B2 (en]) 1993-05-20

Family

ID=17870042

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61299246A Granted JPS63151119A (ja) 1986-12-15 1986-12-15 プレス検出回路

Country Status (3)

Country Link
US (1) US4922547A (en])
EP (1) EP0272068B1 (en])
JP (1) JPS63151119A (en])

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5018188A (en) * 1989-12-20 1991-05-21 Motorola, Inc. Microphone-controller with multifunction, single conductor
JP2734265B2 (ja) * 1991-12-12 1998-03-30 日本電気株式会社 エレクトレット・コンデンサ・マイクロフォン用増幅回路
US5548810A (en) * 1994-03-30 1996-08-20 Safe Pursuit, Inc. Hands-free two-way radio communication system
US5881370A (en) * 1996-10-28 1999-03-09 Pottala; James V. Communication apparatus with an automatically configured multimode talk switch and method of operation
US6504937B1 (en) * 1998-01-06 2003-01-07 Vxi Corporation Amplifier circuit for electret microphone with enhanced performance
US6970752B1 (en) * 2000-05-17 2005-11-29 Hewlett-Packard Development Company, L.P. Method and apparatus for detecting switch closures
US7349547B1 (en) * 2001-11-20 2008-03-25 Plantronics, Inc. Noise masking communications apparatus
US20060183509A1 (en) * 2005-02-16 2006-08-17 Shuyong Shao DC power source for an accessory of a portable communication device
US7912501B2 (en) * 2007-01-05 2011-03-22 Apple Inc. Audio I/O headset plug and plug detection circuitry
JP5254251B2 (ja) * 2007-11-30 2013-08-07 株式会社テムコジャパン トランシーバ等の通信機のスピーカ付ハンドマイクにおける音声入出力自動切替回路
US8861743B2 (en) 2008-05-30 2014-10-14 Apple Inc. Headset microphone type detect
US8629580B2 (en) 2011-02-09 2014-01-14 Apple Inc. Audio accessory type detection and connector pin signal assignment
KR101830866B1 (ko) * 2016-05-19 2018-02-22 주식회사 지엠케이 마이크 단자를 이용한 전원 통신 장치
JP2023042687A (ja) * 2021-09-15 2023-03-28 アイコム株式会社 通信機器および音声信号送信方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191066A (en) * 1962-10-09 1965-06-22 Gen Dynamics Corp Signal sensing switch with slow release
GB1508750A (en) * 1975-05-28 1978-04-26 Tani Denki Kogyo Kk Transmit-receive circuit changing switch system
JPS6041898B2 (ja) * 1977-12-31 1985-09-19 株式会社リコー 送受信回路
JPS56116341A (en) * 1980-02-19 1981-09-12 Nec Corp Radio channel switching system in communication
US4549309A (en) * 1980-08-28 1985-10-22 Corrigan Nigel M Radio transmitting and receiving apparatus
US4400581A (en) * 1980-11-03 1983-08-23 Sava Jacobson Incoming audio detection circuit for a speaker telephone
FR2494530B1 (fr) * 1980-11-17 1987-09-25 Horlogerie Photograph Fse Poste telephonique comportant un preamplificateur a courant porteur, un interrupteur de coupure de micro et un dispositif de signalisation de cette coupure
FR2497433A1 (fr) * 1980-12-31 1982-07-02 Thomson Csf Mat Tel Circuit de liaison d'un microphone actif, en particulier a electret a un circuit de transmission telephonique
US4400584A (en) * 1982-04-05 1983-08-23 Motorola, Inc. Speakerphone for radio and, landline telephones
SE453449B (sv) * 1982-07-06 1988-02-01 Ericsson Telefon Ab L M Anleggning for tradlos overforing av telefonsamtal
JPS607231A (ja) * 1983-06-27 1985-01-16 Toshiba Corp 車載用拡声電話装置
FR2567344B1 (fr) * 1984-07-05 1986-12-26 Picart Lebas Telephones Poste telephonique a ecoute amplifiee et a asservissement d'amplification
US4720856A (en) * 1986-09-02 1988-01-19 Motorola, Inc. Control circuit having a direct current control loop for controlling the gain of an attenuator

Also Published As

Publication number Publication date
US4922547A (en) 1990-05-01
JPS63151119A (ja) 1988-06-23
EP0272068B1 (en) 1993-03-10
EP0272068A2 (en) 1988-06-22
EP0272068A3 (en) 1989-08-30

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