公开(公告)号：US20140376745A1

公开(公告)日：2014-12-25

申请号：US14482049

申请日：2014-09-10

Applicant: IpVenture, Inc.

Inventor： Kwok Wai Cheung ,  Peter P. Tong ,  C. Douglass Thomas

IPC: G10L21/0208

CPC classification number: G10L21/0208 ,  H04R1/403 ,  H04R3/12 ,  H04R25/405 ,  H04R2201/023 ,  H04R2217/03

Abstract: Methods and systems to produce audio output signals from audio input signals. In one embodiment, a first portion of the audio input signals can be pre-processed, with the output used to modulate ultrasonic carrier signals, thereby producing modulated ultrasonic signals. The modulated ultrasonic signals can be transformed into a first portion of the audio output signals, which is directional. Based on a second portion of the audio input signals, a standard audio speaker can output a second portion of the audio output signals. Another embodiment further produces distortion compensated signals based on the pre-processed signals. The distortion compensated signals can be subtracted from the second portion of the audio input signals to generate inputs for the standard audio speaker to output the second portion of the audio output signals. In yet another embodiment, noise can be added during pre-processing of the first portion of the audio input signals.

Abstract translation: 从音频输入信号产生音频输出信号的方法和系统。 在一个实施例中，可以对音频输入信号的第一部分进行预处理，其中输出用于调制超声波载波信号，从而产生调制的超声波信号。 调制的超声波信号可以变换成音频输出信号的第一部分，这是有向的。 基于音频输入信号的第二部分，标准音频扬声器可以输出音频输出信号的第二部分。 另一实施例还基于预处理信号进一步产生失真补偿信号。 可以从音频输入信号的第二部分减去失真补偿信号，以产生用于标准音频扬声器输出音频输出信号的第二部分的输入。 在另一个实施例中，可以在音频输入信号的第一部分的预处理期间添加噪声。