公开(公告)号：US20140128004A1

公开(公告)日：2014-05-08

申请号：US13672326

申请日：2012-11-08

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD.

Inventor： Karthik MURALIDHAR ,  Sapna GEORGE ,  Saurav SAHU ,  Frank TEO

IPC: H04B17/00

CPC classification number: H04B17/13 ,  H04L25/05

Abstract: In an embodiment, an apparatus includes a determiner, converter, adapter, and modifier. The determiner is configured to generate a representation of a difference between a first frequency at which a first signal is sampled and a second frequency at which a second signal is sampled, and the converter is configured to generate a second sample of the first signal at a second time in response to the representation and a first sample of the first signal at a first time. The adapter is configured to generate a sample of a modifier signal in response to the second sample of the first signal, and the modifier is configured to generate a modified sample of the second signal in response to a sample of the second signal and the sample of the modifier signal. For example, such an apparatus may be able to reduce the magnitude of an echo signal in a system having an audio pickup (e.g., a microphone) near an audio output (e.g., a speaker).

Abstract translation: 在一个实施例中，装置包括确定器，转换器，适配器和修改器。 确定器被配置为产生第一信号被采样的第一频率与第二信号被采样的第二频率之间的差异的表示，并且转换器被配置为在第一频率处产生第一信号的第二采样 第二次响应于第一次的表示和第一个信号的第一个样本。 适配器被配置为响应于第一信号的第二样本产生修改器信号的样本，并且修改器被配置为响应于第二信号的样本和第二信号的样本而生成第二信号的修改样本 修改信号。 例如，这样的装置可能能够减小在音频输出（例如扬声器）附近具有音频拾取器（例如，麦克风）的系统中的回波信号的幅度。

公开(公告)号：US20160012826A1

公开(公告)日：2016-01-14

申请号：US14666109

申请日：2015-03-23

Applicant: STMicroelectronics Asia Pacific Pte Ltd ,  STMicroelectronics International N.V.

Inventor： Peng ZHANG ,  Shuzheng XU ,  Pengjun WANG ,  Sapna GEORGE ,  Huazhong YANG

IPC: G10L19/018

CPC classification number: G10L19/018

Abstract: The present invention is a system and method for digital watermarking, which discloses a system for digital watermarking, to add a watermark to an audio signal generated by a signal source. The system comprises: a spectrum modulator configured to perform spectrum modulation to a watermark bit and a pseudo noise signal to be embedded into the audio signal to generate a modulated signal; a distortion controller coupled to the signal source and the spectrum modulator and configured to shape the modulated signal based on the audio signal, so as to generate a shaped signal satisfying a predetermined distortion constraint; and an interference compensator coupled to the signal source and the distortion controller and configured to generate a compensation signal based on the audio signal, the pseudo noise signal, and the shaped signal, wherein the compensation signal is for compensating for interference to watermark decoding caused by the audio signal.

Abstract translation: 本发明是一种用于数字水印的系统和方法，其公开了一种用于数字水印的系统，用于向由信号源产生的音频信号添加水印。 该系统包括：频谱调制器，被配置为对水印位执行频谱调制，并将伪噪声信号嵌入到音频信号中以产生调制信号; 耦合到所述信号源和所述频谱调制器并且被配置为基于所述音频信号对所述调制信号进行调整的失真控制器，以便产生满足预定失真约束的成形信号; 以及干扰补偿器，其耦合到所述信号源和所述失真控制器，并且被配置为基于所述音频信号，所述伪噪声信号和所述成形信号产生补偿信号，其中所述补偿信号用于补偿由水印解码引起的水印解码的干扰 音频信号。