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公开(公告)号:EP0130553A2
公开(公告)日:1985-01-09
申请号:EP84107408.1
申请日:1984-06-27
申请人: STC PLC
发明人: Blomley, Peter Fred , Arton, Kenneth Alexander Manson , Whittaker, Edward John Wemyss , Lefevre, Andrew Paul
CPC分类号: H04M9/085 , H04M1/6033 , H04M1/76 , H04M9/08 , H04M19/04
摘要: An integrated circuit for a telephone instrument provides the basic (POT) service requirement. The circuit has means whereby the transmit and receive channels may be fed via controlled attenuators incorporated in an ancillary circuit to provide hands-free operation. The circuit also includes a current limited power supply whereby connection to a further ancillary circuit including an audio amplifier may be effected to provide loudspeaker operation.
摘要翻译: 用于电话仪器的集成电路提供基本(POT)服务要求。 该电路具有这样的装置,其中发射和接收信道可以通过并入辅助电路中的受控衰减器馈送以提供免提操作。 电路还包括电流有限的电源,由此可以实现与包括音频放大器的另外的辅助电路的连接以提供扬声器操作。