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1.Method of and apparatus for automatically measuring sound transmission characteristics of a room 失效
Title translation: 自动测量房间声音传播特性的方法和装置公开(公告)号:US3156316A
公开(公告)日:1964-11-10
申请号:US6659760
申请日:1960-11-01
Applicant: BELL TELEPHONE LABOR INC
Inventor: BARNEY HAROLD L , GARDNER MARK B
IPC: G01H7/00
CPC classification number: G01H7/00
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公开(公告)号:US3010417A
公开(公告)日:1961-11-28
申请号:US71830346
申请日:1946-12-26
Applicant: BELL TELEPHONE LABOR INC
Inventor: GARDNER MARK B
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3.
公开(公告)号:US3363061A
公开(公告)日:1968-01-09
申请号:US41040964
申请日:1964-11-12
Applicant: BELL TELEPHONE LABOR INC
Inventor: GARDNER MARK B
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4.Elimination of operationally induced noise fluctuations in echo suppressor apparatus 失效
Title translation: 消除回波抑制装置中的操作性噪声波动公开(公告)号:US3161838A
公开(公告)日:1964-12-15
申请号:US22316162
申请日:1962-09-12
Applicant: BELL TELEPHONE LABOR INC
Inventor: FLANAGAN JAMES L , GARDNER MARK B
IPC: H04B3/20
CPC classification number: H04B3/20
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5.Control of dynamic range and sensitivity of echo suppressor circuits 失效
Title translation: 控制回波抑制电路的动态范围和灵敏度公开(公告)号:US3145269A
公开(公告)日:1964-08-18
申请号:US19515962
申请日:1962-05-16
Applicant: BELL TELEPHONE LABOR INC
Inventor: GARDNER MARK B , NELSON JOHN R
IPC: H04B3/20
CPC classification number: H04B3/20
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公开(公告)号:US3128353A
公开(公告)日:1964-04-07
申请号:US17785462
申请日:1962-03-06
Applicant: BELL TELEPHONE LABOR INC
Inventor: GARDNER MARK B
IPC: H04B3/20
CPC classification number: H04B3/20
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