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    • 1. 发明公开
    • Electronic driving circuit for directing an audio signal selectively to one of two speakers
    • 电子驱动用于使音频信号以两个扬声器中的任一个
    • EP1450577A1
    • 2004-08-25
    • EP03003829.3
    • 2003-02-20
    • Sony Ericsson Mobile Communications AB
    • Lechner, Thomas
    • H04R3/12
    • H04R3/12
    • A driving circuit (1''') for selectively operating a hands-free loudspeaker (3) and an earpiece speaker (2) of a mobile terminal is presented. The driving circuit (1''') comprises a voiceband electronic circuit (8) with a balanced output (14) adapted for being switched between an in-phase and an opposite-phase mode, an interconnection means for connecting the earpiece speaker (2) directly to the balanced output (14) of the voiceband circuit (8), and an adder circuit (4, 10', 10", 11') for adding signals supplied by each port of the balanced output and for providing the sum-signal to the hands-free loudspeaker (3).
    • 用于选择性地操作免提扬声器(3)和移动到耳机扬声器的驱动电路(1“”“)(2)的终端的呈现。 驱动电路(1“”“)包括话音带电子电路(8)配有一个平衡的输出(14)angepasst为同相和反相模式之间切换,在互连装置,用于连接耳机扬声器(2 )直接连接到语音带电路的用于添加通过平衡输出的每个端口提供的信号和用于提供求和平衡输出(14)(8),以及加法器电路(4,10“ 10' ,11”) 信号以免提扬声器(3)。