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公开(公告)号：US2811581A
公开(公告)日：1957-10-29
申请号：US32086552
申请日：1952-11-17
Applicant: ZENITH RADIO CORP
Inventor： SPRACKLEN JOHN G
IPC: H04N5/12
CPC classification number: H04N5/126
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公开(公告)号：US2785299A
公开(公告)日：1957-03-12
申请号：US30587552
申请日：1952-08-22
Applicant: ZENITH RADIO CORP
Inventor： SPRACKLEN JOHN G
IPC: H04N5/455
CPC classification number: H04N5/455
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公开(公告)号：US3601550A
公开(公告)日：1971-08-24
申请号：US3601550D
申请日：1969-03-21
Applicant: ZENITH RADIO CORP
Inventor： SPRACKLEN JOHN G
CPC classification number: H04B5/00
Abstract: A limited-range, induction-coupled loop communication system for the transmission of audio information to a receiver located within the loop uses a frequency-modulated carrier-wave signal to transmit audio information to one or more receivers located within the loop. Each receiver has a pair of pickup coils preferably mounted at 90* relative to each other and a phaseshifting network connected to each of their outputs to thereby create a quadrature relationship in the received signals to substantially eliminate the occurrence of null conditions with variations in receiver orientation.
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Patent Agency Ranking
公开(公告)号：US3055976A
公开(公告)日：1962-09-25
申请号：US5232160
申请日：1960-08-24
Applicant: ZENITH RADIO CORP
Inventor： SPRACKLEN JOHN G
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公开(公告)号：US2852599A
公开(公告)日：1958-09-16
申请号：US59866756
申请日：1956-07-18
Applicant: ZENITH RADIO CORP
Inventor： ROBERT ADLER , SPRACKLEN JOHN G
IPC: H04N9/455
CPC classification number: H04N9/455
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公开(公告)号：US2785300A
公开(公告)日：1957-03-12
申请号：US42090954
申请日：1954-04-05
Applicant: ZENITH RADIO CORP
Inventor： SPRACKLEN JOHN G
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公开(公告)号：US2768319A
公开(公告)日：1956-10-23
申请号：US24676851
申请日：1951-09-15
Applicant: ZENITH RADIO CORP
Inventor： SPRACKLEN JOHN G
IPC: H04N5/073
CPC classification number: H04N5/073
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公开(公告)号：US2721895A
公开(公告)日：1955-10-25
申请号：US32375252
申请日：1952-12-03
Applicant: ZENITH RADIO CORP
Inventor： SPRACKLEN JOHN G
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