JPS5154703A - - Google Patents

Info

Publication number
JPS5154703A
JPS5154703A JP49128104A JP12810474A JPS5154703A JP S5154703 A JPS5154703 A JP S5154703A JP 49128104 A JP49128104 A JP 49128104A JP 12810474 A JP12810474 A JP 12810474A JP S5154703 A JPS5154703 A JP S5154703A
Authority
JP
Japan
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.)
Pending
Application number
JP49128104A
Inventor
Kazuo Ikoma
Hidetomo Takeda
Tadashi Kudo
Eiya Kuriki
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP49128104A priority Critical patent/JPS5154703A/ja
Priority to US05/615,705 priority patent/US4068092A/en
Publication of JPS5154703A publication Critical patent/JPS5154703A/ja
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H03G3/3015—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable using diodes or transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
JP49128104A 1974-11-08 1974-11-08 Pending JPS5154703A (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP49128104A JPS5154703A (ja) 1974-11-08 1974-11-08
US05/615,705 US4068092A (en) 1974-11-08 1975-09-22 Voice control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP49128104A JPS5154703A (ja) 1974-11-08 1974-11-08

Publications (1)

Publication Number Publication Date
JPS5154703A true JPS5154703A (ja) 1976-05-14

Family

ID=14976477

Family Applications (1)

Application Number Title Priority Date Filing Date
JP49128104A Pending JPS5154703A (ja) 1974-11-08 1974-11-08

Country Status (2)

Country Link
US (1) US4068092A (ja)
JP (1) JPS5154703A (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS544003A (en) * 1977-06-10 1979-01-12 Matsushita Electric Ind Co Ltd Mutual communication unit of loud type
JPS5461404A (en) * 1977-10-25 1979-05-17 Nec Corp Adaptive signal detector
JPS61195055A (ja) * 1985-02-25 1986-08-29 Matsushita Electric Works Ltd 拡声電話機の音声スイツチ回路

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456789A (en) * 1978-03-07 1984-06-26 The Post Office Audio teleconferencing
US4297527A (en) * 1979-05-01 1981-10-27 E-Systems, Inc. Input gain adjusting apparatus and method
CA1184506A (en) * 1980-04-21 1985-03-26 Akira Komatsu Method and system for discriminating human voice signal
US4514703A (en) * 1982-12-20 1985-04-30 Motrola, Inc. Automatic level control system
US4490582A (en) * 1983-02-18 1984-12-25 At&T Information Systems Inc. Speakerphone control circuit
US4532849A (en) * 1983-12-15 1985-08-06 Drew Dennis M Signal shape controller
US4542263A (en) * 1984-03-07 1985-09-17 Oki Electric Industry Co., Ltd. Speech control circuit
US4598418A (en) * 1985-02-05 1986-07-01 Griffith Jr Eugene R Sound system employing automatic proportional amplification
US4630302A (en) * 1985-08-02 1986-12-16 Acousis Company Hearing aid method and apparatus
CA1291837C (en) * 1987-07-15 1991-11-05 Juro Ohga Electronic telephone terminal having noise suppression function
US4882761A (en) * 1988-02-23 1989-11-21 Resound Corporation Low voltage programmable compressor
US4882762A (en) * 1988-02-23 1989-11-21 Resound Corporation Multi-band programmable compression system
US5162832A (en) * 1989-06-20 1992-11-10 Konica Corporation Automatic release camera
US5204908A (en) * 1990-09-26 1993-04-20 Lectrosonics, Inc. Sound system with rate controlled, variable attenuation
US5732143A (en) * 1992-10-29 1998-03-24 Andrea Electronics Corp. Noise cancellation apparatus
US6138036A (en) * 1997-03-13 2000-10-24 Oki Telecom, Inc. Wireless telephone with voice data interface mode
US6363345B1 (en) 1999-02-18 2002-03-26 Andrea Electronics Corporation System, method and apparatus for cancelling noise
US6594367B1 (en) 1999-10-25 2003-07-15 Andrea Electronics Corporation Super directional beamforming design and implementation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050584A (en) * 1958-12-24 1962-08-21 American Telephone & Telegraph Conference telephone apparatus
JPS5132042A (en) * 1974-09-11 1976-03-18 Jukan Fujimoto Kucho oyobi haienyokeihotsukibokadanpa

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2321986A (en) * 1942-03-07 1943-06-15 Bell Telephone Labor Inc Noise reduction in telephone transmission systems
US2409977A (en) * 1943-11-09 1946-10-22 Rogers Majestic Corp Means for suppression of noise in communication systems
US2761897A (en) * 1951-11-07 1956-09-04 Jones Robert Clark Electronic device for automatically discriminating between speech and music forms
US3286031A (en) * 1963-03-04 1966-11-15 Alto Scient Co Inc Voice actuated device
US3448215A (en) * 1966-08-22 1969-06-03 Northrop Corp Monitoring device for distinguishing between voice and data signals
US3712959A (en) * 1969-07-14 1973-01-23 Communications Satellite Corp Method and apparatus for detecting speech signals in the presence of noise
US3700811A (en) * 1970-07-20 1972-10-24 Motorola Inc Tone and volume control for a multi-channel audio amplifier system
US3751602A (en) * 1971-08-13 1973-08-07 Bell Telephone Labor Inc Loudspeaking telephone

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050584A (en) * 1958-12-24 1962-08-21 American Telephone & Telegraph Conference telephone apparatus
JPS5132042A (en) * 1974-09-11 1976-03-18 Jukan Fujimoto Kucho oyobi haienyokeihotsukibokadanpa

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS544003A (en) * 1977-06-10 1979-01-12 Matsushita Electric Ind Co Ltd Mutual communication unit of loud type
JPS5461404A (en) * 1977-10-25 1979-05-17 Nec Corp Adaptive signal detector
JPS61195055A (ja) * 1985-02-25 1986-08-29 Matsushita Electric Works Ltd 拡声電話機の音声スイツチ回路

Also Published As

Publication number Publication date
US4068092A (en) 1978-01-10

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