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Publication date
Application filedfiledCritical
Priority to JP11754476ApriorityCriticalpatent/JPS5342608A/ja
Publication of JPS5342608ApublicationCriticalpatent/JPS5342608A/ja
Publication of JPS5745386B2publicationCriticalpatent/JPS5745386B2/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
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
JP11754476A1976-09-301976-09-30Speaker telephone set
GrantedJPS5342608A
(en)