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GIRARD J PHILIPPE
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GIRARD J PHILIPPE
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Application filed by GIRARD J PHILIPPEfiledCriticalGIRARD J PHILIPPE
Priority to FR7405049ApriorityCriticalpatent/FR2261669A1/fr
Publication of FR2261669A1publicationCriticalpatent/FR2261669A1/fr
Application grantedgrantedCritical
Publication of FR2261669B1publicationCriticalpatent/FR2261669B1/fr
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)
Interface Circuits In Exchanges
(AREA)
FR7405049A1974-02-141974-02-14Telephone equipment self-energising protection device - can compensate the Larsen effect in lines with ear-piece
GrantedFR2261669A1
(en)