公开(公告)号：US5696821A

公开(公告)日：1997-12-09

申请号：US607909

申请日：1996-02-28

Applicant: Steven Adam Urbanski

Inventor： Steven Adam Urbanski

IPC: H04M9/08

CPC classification number: H04M9/082

Abstract: A radiotelephone (101) comprises a receiver (217), a transmitter (215), an attenuator (305), a loudspeaker (203) and a microphone (201). The receiver (217) receives a forward audio signal (257) on a forward signal path (256) coupled to the loudspeaker (203) for producing a first acoustic signal (263). The transmitter (215) transmits a reverse audio signal (243) generated by the microphone (201) on a reverse signal path (248). A portion of the first acoustic signal (263) is coupled to the microphone (201) for producing a feedback audio signal (337) on the reverse signal path (248). The attenuator (305) attenuates the reverse audio signal (337) responsive to a measure of the feedback audio signal (339). The measure of the feedback audio signal (339) preferably comprises a signal to noise ratio measurement of the feedback audio signal (337). The attenuator (305) is further responsive to the first audio signal (257), and an acoustic audio signal (239) which may also be coupled to the reverse signal path (248). The present invention advantageously reduces audio feedback in a digital radiotelephone system (102) where audio processing times are long.

Abstract translation: 无线电话机（101）包括接收机（217），发射机（215），衰减器（305），扬声器（203）和麦克风（201）。 接收器（217）在耦合到扬声器（203）的前向信号路径（256）上接收用于产生第一声信号（263）的前向音频信号（257）。 发射机（215）在反向信号路径（248）上发送由麦克风（201）产生的反向音频信号（243）。 第一声​​信号（263）的一部分耦合到麦克风（201），用于在反向信号路径（248）上产生反馈音频信号（337）。 响应于反馈音频信号（339）的测量，衰减器（305）衰减反向音频信号（337）。 反馈音频信号（339）的测量优选地包括反馈音频信号（337）的信噪比测量。 衰减器（305）还响应于第一音频信号（257）和还可以耦合到反向信号路径（248）的声学音频信号（239）。 本发明有利地减少音频处理时间长的数字无线电话系统（102）中的音频反馈。

公开(公告)号：US5668871A

公开(公告)日：1997-09-16

申请号：US235614

申请日：1994-04-29

Applicant: Steven Adam Urbanski

Inventor： Steven Adam Urbanski

IPC: H04M9/08

CPC classification number: H04M9/082

Abstract: An audio signal processor (209) comprises a forward signal path (256) having a forward audio signal (257) coupled to a loudspeaker (203) for producing a first acoustic signal (263), and a reverse signal path (248) coupled to a microphone (201) for producing a reverse audio signal (243), wherein at least a portion of the first acoustic signal (263) is coupled to the microphone (201) for producing a feedback audio signal (337) on the reverse signal path (248). An attenuator (305), coupled to the microphone (201), attenuates the reverse audio signal (243) responsive to a measure of the feedback audio signal (339). The measure of the feedback audio signal (339) preferrably comprises a signal to noise ratio measurement of the feedback audio signal (337). The attenuator (305) is further responsive to at least one of the first audio signal (257), and a third audio signal (239) which may also be coupled to the reverse signal path (248). The [present invention] audio signal processor (209) advantageously reduces audio feedback in a digital radiotelephone system (102) where audio processing times are long.

Abstract translation: 音频信号处理器（209）包括具有耦合到用于产生第一声信号（263）的扬声器（203）的前向音频信号（257）的正向信号路径（256）和耦合到 用于产生反向音频信号（243）的麦克风（201），其中所述第一声信号（263）的至少一部分耦合到所述麦克风（201），用于在反向信号路径上产生反馈音频信号（337） （248）。 耦合到麦克风（201）的衰减器（305）响应于反馈音频信号（339）的测量而衰减反向音频信号（243）。 反馈音频信号（339）的测量优选地包括反馈音频信号（337）的信噪比测量。 衰减器（305）还响应于第一音频信号（257）中的至少一个以及也可耦合到反向信号路径（248）的第三音频信号（239）。 本发明的音频信号处理器（209）有利地减少音频处理时间长的数字无线电话系统（102）中的音频反馈。

公开(公告)号：US5710862A

公开(公告)日：1998-01-20

申请号：US85693

申请日：1993-06-30

Applicant: Steven Adam Urbanski

Inventor： Steven Adam Urbanski

IPC: G10L15/20 ,  G10L11/00 ,  G10L19/00 ,  G10L21/02 ,  H04B1/10 ,  H04B7/26 ,  G10L9/00

CPC classification number: G10L21/0208 ,  G10L2021/02168

Abstract: An improved method and an apparatus for reducing an undesirable characteristic of a spectral estimate of a noise signal (203) between occurrences of voice signals (202) in an input signal (117). A spectrum of the input signal (117) is estimated to produce a spectral estimate (119) of the input signal (117) including the undesirable characteristic of the noise signal (203). The spectrum of the input signal (117) is smoothed over a first bandwidth (f3-f4) during the occurrences of the voice signals (203) and over a second bandwidth (f2-f5), substantially greater than the first bandwidth (f3-f4), between the occurrences of the voice signals (203). Alternatively, the spectral estimate (119) of the input signal (117) is filtered between the occurrences of the voice signals (203). Alternatively, the significance of magnitude and/or phase components of poles (301-305), representing the spectral estimate (119) of the input signal (117), between the occurrences of the voice signals (203) is reduced to produce a modified spectral estimate (120) of the input signal (117) between the occurrences of the voice signals (203).

Abstract translation: 一种改进的方法和装置，用于在输入信号（117）中的语音信号（202）出现之前降低噪声信号（203）的频谱估计的不希望的特性。 估计输入信号（117）的频谱以产生包括噪声信号（203）的不期望的特性的输入信号（117）的谱估计（119）。 输入信号（117）的频谱在语音信号（203）出现期间在第一带宽（f3-f4）上平滑，并且在第二带宽（f2-f5）上，基本上大于第一带宽（f3- f4），在语音信号（203）的发生之间。 或者，输入信号（117）的频谱估计（119）在语音信号（203）的出现之间被滤波。 或者，减少表示语音信号（203）出现之间的输入信号（117）的频谱估计（119）的极（301-305）的幅度和/或相位分量的重要性，以产生经修改的 在语音信号（203）的出现之间的输入信号（117）的频谱估计（120）。

公开(公告)号：US5666429A

公开(公告)日：1997-09-09

申请号：US276736

申请日：1994-07-18

Applicant: Steven Adam Urbanski

Inventor： Steven Adam Urbanski

IPC: G10L21/02 ,  H03G9/02 ,  H04M9/08 ,  H04R25/00 ,  H04B15/00

CPC classification number: H03G9/005 ,  H03G9/025 ,  H04M9/085 ,  H04R25/505 ,  G10L21/0208

Abstract: An energy estimator (223) and method therefor decimates (401) a signal (211) to produce a decimated signal (411); rectifies (403) the decimated signal (411) to produce a full wave rectified signal (413); averages (405) the full wave rectified signal (413) over a predetermined time period to produce an averaged signal (415); applies a logarithmic function (407) to the averaged signal (415) to produce a logarithmic signal (417); and filters (409) the logarithmic signal (417) to produce an energy estimate (229) of the signal (211). The energy estimator (223) and method therefor advantageously reduces complexity while improving performance over those energy estimators of the prior art.

Abstract translation: 能量估计器（223）及其方法对信号（211）进行抽取（401）以产生抽取信号（411）; 整流（403）抽取信号（411）以产生全波整流信号（413）; 在预定时间段内平均（405）全波整流信号（413）以产生平均信号（415）; 将对数函数（407）应用于平均信号（415）以产生对数信号（417）; 以及过滤器（409）对数信号（417）以产生信号（211）的能量估计（229）。 能量估计器（223）及其方法有利地降低了复杂度，同时提高了现有技术的能量估计器的性能。