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    Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation
    1.
    发明授权
    Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation 失效
    用于向电话用户提供对用户的语音控制半双工免提电话对话的阈值音量的控制的装置和方法

    公开(公告)号：US5857019A

    公开(公告)日：1999-01-05

    申请号：US662569

    申请日：1996-06-11

    申请人： David Iglehart ,  Leland Lester ,  Joel Q. Adams ,  Geof Findley

    发明人： David Iglehart ,  Leland Lester ,  Joel Q. Adams ,  Geof Findley

    IPC分类号： H04R3/02 ,  H04B3/20 ,  H04M1/60 ,  H04M9/08 ,  H04M9/10 ,  H04M9/00

    CPC分类号： H04M9/10 ,  H04M9/08

    摘要： An improved speakerphone that may be viewed as a modification of a conventional half-duplex speakerphone that includes transmit and receive attenuators for alternatively isolating either a speaker or a microphone from a phone line. The attenuators are controlled by a controller that compares a signal generated by the microphone with a signal received on the phone line to determine which of the transmit or receive attenuators should be turned on. In the present invention, a first variable gain amplifier is connected so as to amplify the signal generated by the microphone prior to the signal being connected to the controller, and a second variable gain amplifier is connected so as to amplify the signal received on the phone line prior to the signal being connected to the controller. The first and second variable gain amplifiers have adjustable gain controls that are connected such that the gain of the first variable amplifier is decreased when the gain of the second variable amplifier is increased and vice versa. The adjustable gain control of one of the adjustable gain amplifiers is accessible to the user of the speakerphone and allows the user to adjust the threshold at which his voice will take over the conversation.

    摘要翻译： 一种改进的免提电话，其可被视为传统的半双工免提电话的修改，其包括用于将扬声器或麦克风与电话线隔离的发送和接收衰减器。 衰减器由控制器控制，该控制器将由麦克风产生的信号与在电话线上接收到的信号进行比较，以确定哪个发射或接收衰减器应该被接通。 在本发明中，连接第一可变增益放大器，以便在信号连接到控制器之前放大由麦克风产生的信号，并且连接第二可变增益放大器以放大在电话上接收到的信号 信号连接到控制器之前的线路。 第一和第二可变增益放大器具有连接的可调节增益控制，使得当第二可变放大器的增益增加时第一可变放大器的增益减小，反之亦然。 可调节增益放大器之一的可调节增益控制可由扬声器电话的用户访问，并允许用户调整其声音将接管对话的阈值。