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    • 3. 发明授权
    • Method and apparatus for independent gain control of a microphone and speaker for a speakerphone mode and a non-speakerphone audio mode of a computer system
    • 用于独立增益控制用于计算机系统的扬声器电话模式和非扬声器音频模式的麦克风和扬声器的方法和装置
    • US06195437B1
    • 2001-02-27
    • US08941580
    • 1997-09-30
    • Mitchell A. MarkowJeremy FordJi-An Gong
    • Mitchell A. MarkowJeremy FordJi-An Gong
    • H04B1500
    • H04M1/6033H04M9/08
    • A method and apparatus for controlling acoustic gain during a non-speakerphone audio mode of computer system independent of acoustic gain during a speakerphone mode of the computer system is provided. The BIOS code of the computer system detects whether the computer system is in a speakerphone mode or a non-speakerphone audio mode. If the computer system is in a speakerphone mode, an upper gain limit is not applied to the microphone path of the computer system. If the computer system is in a non-speakerphone audio mode, a predetermined upper gain limit is applied to the microphone path of the computer system. The predetermined upper gain limit is preferably applied to the microphone path at either a microphone pre-amplifier or an audio mixer chip in the microphone path of the computer system.
    • 提供一种在计算机系统的免提电话模式期间独立于声学增益的用于控制计算机系统的非扬声器电话音频模式期间的声增益的方法和装置。 计算机系统的BIOS代码检测计算机系统是扬声器模式还是非扬声器音频模式。 如果计算机系统处于免提模式,则不会对计算机系统的麦克风路径应用较高的增益限制。 如果计算机系统处于非扬声器音频模式,则将预定的上限增益限制应用于计算机系统的麦克风路径。 优选地,在计算机系统的麦克风路径中的麦克风前置放大器或音频混合器芯片的麦克风路径处应用预定的上限增益限制。
    • 8. 发明授权
    • Acoustic coupling compensation for a speakerphone of a system
    • 系统扬声器的声耦合补偿
    • US06459942B1
    • 2002-10-01
    • US08940928
    • 1997-09-30
    • Mitchell A. MarkowJeremy FordJi-An Gong
    • Mitchell A. MarkowJeremy FordJi-An Gong
    • G06F1700
    • H04M9/082
    • A speakerphone of a system with a digital signal processor, such as a computer, uses a filter set or network to provide acoustic coupling loss at a microphone to offset acoustic coupling gain produced by sound reflections resulting from various conditions in the system. The filter network processes an acoustic signal before the signal is provided to a digital signal processor to eliminate acoustic coupling gain that the digital signal processor is unable to cancel or offset. The filter network detects when the acoustic coupling gain in the acoustic signal at the microphone exceeds the maximum amount of acoustic coupling loss supplied by the digital signal processor. Alternatively, if acoustic coupling gain is desirable at the frequency location of the anomaly caused by the sound reflections, the filter network is used to boost the acoustic coupling gain produced by the anomaly. Thus, the present speakerphone uses equalization at the microphone to boost or attenuate acoustic coupling gain caused by frequency anomalies before acoustic echo cancellation by the digital signal processor.
    • 具有诸如计算机的数字信号处理器的系统的扬声器使用滤波器组或网络来提供麦克风处的声耦合损耗,以补偿由系统中的各种条件导致的声音反射产生的声耦合增益。 滤波器网络在将信号提供给数字信号处理器之前处理声信号,以消除数字信号处理器不能取消或抵消的声耦合增益。 滤波器网络检测麦克风的声信号中的声耦合增益何时超过由数字信号处理器提供的最大声耦合损耗量。 或者,如果在由声音反射引起的异常的频率位置期望声耦合增益,则使用滤波器网络来提高由异常产生的声耦合增益。 因此,本发明的扬声器在麦克风上使用均衡来增强或减弱由数字信号处理器进行声学回波消除之前由频率异常引起的声耦合增益。