Methods and apparatus to perform audio watermarking and watermark detection and extraction
    10.
    发明授权
    Methods and apparatus to perform audio watermarking and watermark detection and extraction 有权
    执行音频水印和​​水印检测和提取的方法和装置

    公开(公告)号:US09460730B2

    公开(公告)日:2016-10-04

    申请号:US13730271

    申请日:2012-12-28

    摘要: Encoding and decoding methods and apparatus are described to obtain auxiliary information from an audio signal. The auxiliary information uses a plurality of frequency components residing in a plurality of code bands. The audio signal is transformed into a frequency domain representation. Characteristics of frequencies of the frequency domain representation that may contain the auxiliary information are determined. The characteristics of frequencies of the frequency domain representation in a respective one of the code bands that may contain the auxiliary information are normalized across the code band. The normalization is carried out against a characteristic of a frequency in that code band. The normalized characteristics of the frequencies representative of auxiliary information are summed to determine a sum for a frequency representative of auxiliary information. It is determined when the sum is representative of the auxiliary information.

    摘要翻译: 描述编码和解码方法和装置以从音频信号获得辅助信息。 辅助信息使用驻留在多个码带中的多个频率分量。 音频信号被转换成频域表示。 确定可能包含辅助信息的频域表示的频率特性。 可以包含辅助信息的相应一个码带中的频域表示的频率的特性在码带上被归一化。 根据该频带的频率的特性进行归一化。 表示辅助信息的频率的归一化特征相加以确定表示辅助信息的频率的和。 确定何时代表辅助信息。