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INT TELEPHONLAUTSPRECHERGESELL
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INT TELEPHONLAUTSPRECHERGESELL
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Publication of FR829468ApublicationCriticalpatent/FR829468A/en
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
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Interconnected Communication Systems, Intercoms, And Interphones
(AREA)
Telephone Set Structure
(AREA)
FR829468D1936-11-241937-11-19
Improvements to telephone sets with microphone and receiver remote from the user
ExpiredFR829468A
(en)