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    • 9. 发明授权
    • Microphone selection process for use in a multiple microphone voice
actuated switching system
    • 麦克风选择过程用于多麦克风语音切换系统
    • US5625697A
    • 1997-04-29
    • US436671
    • 1995-05-08
    • Donald J. BowenGregory Ciurpita, Jr.
    • Donald J. BowenGregory Ciurpita, Jr.
    • H04R3/00H04M3/56H04M9/08H04M9/10H04R27/00H04R29/00
    • H04M9/08H04M9/10H04R27/00H04R2201/401H04R3/005
    • A microphone selection process is made relatively constant in terms of processing requirements through use of combination values which provide a measure of the quality of the speech signal received in each one of a plurality of microphones. Such combination values are derived in a manner which provides an indication of which one of the plurality of microphones, that provide area coverage for a conference room, for example, best receives the speech signal. In operation, the microphone selection process selects the microphone which best receives the speech signal by comparing a signal energy value received in each one of the microphones to that received in each of the other microphones. More specifically, pairs of microphones are examined, to determine the direction of origin for the speech, by seeking a microphone pair where the speech is strong in the microphone directed toward the source of speech, and weak in an associated microphone directed away from the source of speech. Since a null, which is located at the back of each microphone, is narrower than a main beam or sensitivity pattern, which is located at the front of each microphone, this null is more sensitive to and therefore a better indicator of the direction of origin for the speech than is the main beam. The combination of the signal energy values for each pair of microphones advantageously provides a specific combination value which is used to identify and select the microphone which best receives the speech signal.
    • 通过使用提供在多个麦克风中的每一个中接收的语音信号的质量的量度的组合值,麦克风选择处理在处理要求方面相对恒定。 这样的组合值以提供指示多个麦克风哪一个提供会议室的区域覆盖,例如最好地接收语音信号的方式被导出。 在操作中,麦克风选择过程通过将在每个麦克风中接收的信号能量值与在每个麦克风中接收的信号能量值进行比较来选择最好接收语音信号的麦克风。 更具体地,通过寻找麦克风对来检查麦克风对来确定语音的起始方向,其中话筒在指向语音源的麦克风中的语音强度较弱,并且相关联的麦克风中的弱线指向远离源 的言论。 由于位于每个麦克风后面的零点比位于每个麦克风前面的主波束或灵敏度图案窄,所以该零点对原点方向更敏感并因此更好的指示 为演讲而不是主梁。 每对麦克风的信号能量值的组合有利地提供特定的组合值,其用于识别和选择最佳接收语音信号的麦克风。