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.)
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 filedfiledCritical
Priority to JP8424475ApriorityCriticalpatent/JPS527608A/ja
Priority to US05/652,847prioritypatent/US4051325A/en
Priority to CA244,584Aprioritypatent/CA1048186A/en
Publication of JPS527608ApublicationCriticalpatent/JPS527608A/ja
Publication of JPS5746264B2publicationCriticalpatent/JPS5746264B2/ja
H04M9/00—Arrangements for interconnection not involving centralised switching
H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo
(AREA)
Interconnected Communication Systems, Intercoms, And Interphones
(AREA)
JP8424475A1975-01-311975-07-08Simultaneous communication interphone
GrantedJPS527608A
(en)