NACHRICHTENTECHNISCHES GERAET MIT EINER FREISPRECHEINRICHTUNG
摘要
Telephone sets are known which have a handset with internal electro-acoustic transducers, a handset support and additional electro-acoustic transducers disposed outside the handset for hands-free operation. In order to achieve flexible and low-cost fitting of telephone devices of this type, the invention proposes to dispose the hands-free device in the handset. A hands-free device can be retrofitted in this way by anone without interfering with the communications device, simply by exchanging the handset.
申请公布号
DE4207507(A1)
申请公布日期
1993.09.16
申请号
DE19924207507
申请日期
1992.03.10
申请人
PHILIPS PATENTVERWALTUNG GMBH, 20097 HAMBURG, DE
发明人
WALTERS, ECKHARD, DIPL.-ING., 8505 ROETHENBACH, DE