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    • 52. 发明申请
    • WATERMARK INSERTION AND EXTRACTION
    • 水印插入和提取
    • WO01091120A1
    • 2001-11-29
    • PCT/EP2001/004931
    • 2001-05-01
    • H04N5/91G10L11/00G11B20/00G11B20/10H04H20/00H04H20/31H04H60/37H04N5/913H04H1/00
    • G11B20/00891G11B20/00086G11B20/10527G11B2020/00065H04H20/31H04H60/37H04H2201/50H04N2005/91335
    • A high-quality signal, for example a unity-bit coded (DSD) audio signal having a 2.822 MHz bit rate (fs1) is converted to a lower sample rate (fs3) PCM signal by means of a sample rate converter (102). The watermark is embedded at the lower sample rate by a conventional watermark embedder (101) which is capable of handling signals at this lower rate. The watermark (WM) is not otherwise available. It is subsequently retrieved by subtracting (103) the unwatermarked signal from the watermarked signal, and up-sampled (104) to an intermediate sampling rate (fs2). The DSD signal is converted (110) to a PCM signal at said intermediate sample rate. The retrieved watermark is then added (107) to the PCM signal and the watermarked PCM signal is back-converted (120) to a unity-bit coded DSD signal. In a preferred embodiment, the arrangement includes a compensation circuit (105) which compensates the information signal X' for any (e.g. non-linear) operations performed by the embedder (101) so as to minimize the estimated watermark (WM'). The compensation circuit re-introduces said operations in the DSD domain by controlling parameters such as scaling (106, 109) and time shifting (108).
    • 具有2.822MHz比特率(fs1)的高质量信号,例如具有2.822MHz比特率(fs1)的单位编码(DSD)音频信号通过采样率转换器(102)转换成较低的采样率(fs3)PCM信号。 通过常规水印嵌入器(101)以较低采样率嵌入水印,该水印嵌入器能够以较低的速率处理信号。 水印(WM)不可用。 然后通过从水印信号中减去(103)未水印的信号,并将上采样(104)提取到中间采样率(fs2)来检索。 DSD信号以所述中间采样率被转换(110)到PCM信号。 然后将检索到的水印(107)加到PCM信号,并将加水印的PCM信号反向转换(120)到单位编码的DSD信号。 在优选实施例中,该装置包括补偿电路(105),其补偿由嵌入器(101)执行的任何(例如非线性)操作的信息信号X',以使估计水印(WM')最小化。 补偿电路通过控制诸如缩放(106,109)和时移(108)的参数来重新引入DSD域中的所述操作。
    • 53. 发明申请
    • SYSTEM AND METHOD FOR EXTRACTING, DECODING, AND UTILIZING HIDDEN DATA EMBEDDED IN AUDIO SIGNALS
    • 用于提取,解码和使用嵌入在音频信号中的隐藏数据的系统和方法
    • WO01082554A2
    • 2001-11-01
    • PCT/US2001/013432
    • 2001-04-26
    • G10L11/00G06Q30/06H04H20/31H04L29/00
    • G10L19/018G06Q30/0601H04H20/31
    • A system and method for enabling a user to retrieve, decode, and utilize hidden data embedded in audio signals. An exemplary implementation includes a microphone structured to receive sound waves representative of an audio signal and hidden data embedded in the audio signal. The then microphone converts the received sound waves into an electrical output signal. The system also includes a processor electrically coupled to the microphone and configured to receive the electrical output signal in order to extract the hidden data and provide information represented by the hidden data as an output thereof. A user interface is also provided and is electrically coupled to the processor and configured to receiver a first input from the user and activate the processor to selectively initiate extraction of the hidden data. The processor produces as an output the information represented by the hidden data. Finally, the system includes a user presentation mechanism configured to present the information to the user.
    • 一种用于使用户能够检索,解码和利用嵌入在音频信号中的隐藏数据的系统和方法。 示例性实施方式包括构造成接收表示音频信号的声波和嵌入在音频信号中的隐藏数据的麦克风。 然后麦克风将接收的声波转换成电输出信号。 该系统还包括电耦合到麦克风并被配置为接收电输出信号以便提取隐藏数据并且提供由隐藏数据表示的信息作为其输出的处理器。 还提供用户接口并且电耦合到处理器并且被配置为从用户接收第一输入并激活处理器以选择性地启动隐藏数据的提取。 处理器产生由隐藏数据表示的信息作为输出。 最后,该系统包括被配置为向用户呈现信息的用户呈现机制。
    • 55. 发明申请
    • METHOD AND DEVICE FOR INTRODUCING INFORMATION INTO A DATA STREAM AND A METHOD FOR ENCODING AN AUDIO SIGNAL
    • 用于向数据流引入信息的方法和设备以及用于编码音频信号的方法和设备
    • WO0126262A3
    • 2001-10-25
    • PCT/EP0009771
    • 2000-10-05
    • FRAUNHOFER GES FORSCHUNGNEUBAUER CHRISTIANHERRE JUERGENBRANDENBURG KARLHEINZALLAMANCHE ERIC
    • NEUBAUER CHRISTIANHERRE JUERGENBRANDENBURG KARLHEINZALLAMANCHE ERIC
    • G10L19/018G10L19/02H04B1/66H04B1/707H04H20/31H04H1/00
    • H04H20/31G10L19/018G10L19/02H04B1/707
    • The invention relates to a method for introducing information into a data stream containing data related to spectral values which represent a short-term spectrum of an audio signal. According to said method, the data stream is first processed (10, 16, 18), in order to obtain the spectral values for the short-term spectrum of the audio signal. In addition, the information to be introduced is subjected to a spread sequence (20) in order to obtain an expanded information signal which leads to the creation of a spectral representation of the expanded information signal (20). This representation is then weighted using a determined psychoacoustic noise energy which can be masked (20), in order to generate a weighted information signal, in which the energy level of the introduced information is substantially equal to or lies below the psychoacoustic masking threshold. The weighted information signal and the spectral values for the short-term spectrum are subsequently totalled (20) and then re-processed (22, 24, 26) in order to obtain a processed data stream which comprises both the audio information and the information to be introduced. In order for the information to be introduced without having to pass into the time domain, the block raster which underlies the short-term spectrum is not infringed, so that the introduction of a watermark does not lead to a tandem encoding effect.
    • 用于将信息转换成具有表示音频信号的短期频谱数据的频谱值,数据流的本发明的方法首先执行所述数据流的处理(10,16,18),以获得音频信号的短期频谱的频谱值。 此外,待引入的信息经受扩频序列(20),以获得扩展的信息信号,在这之后被产生的扩展信息信号的频谱表示(20),然后将其与一个确定的心理声学屏蔽噪声能量(20)加权的加权 生成信息信号,其中所引入的信息的能量基本上等于或低于心理声学掩蔽阈值。 然后将加权的信息信号和音频信号的短期频谱的频谱值进行求和(20),随后再加工(22,24,26),以获得包含两个音频信息和将要引入的信息的处理的数据流。 在被引入被插入到数据流中的信息表征,而无需在时域已经过去了,Blockrasterung这是短期的频谱是基础,没有被触及,所以引入了水印的,不会产生任何串联Codiereffekten。
    • 58. 发明申请
    • SYSTEM AND METHOD FOR ENCODING AN AUDIO SIGNAL, BY ADDING AN INAUDIBLE CODE TO THE AUDIO SIGNAL, FOR USE IN BROADCAST PROGRAMME IDENTIFICATION SYSTEMS
    • 通过向音频信号添加无效代码来编码音频信号的系统和方法,用于广播程序识别系统
    • WO00004662A1
    • 2000-01-27
    • PCT/US1998/023558
    • 1998-11-05
    • G10L19/00G10L11/00H04B1/713H04H20/31H04H20/33H04H60/37H04H60/39H04H1/00
    • H04H20/31H04H20/33H04H60/37H04H60/39H04H2201/50
    • An encoder is arranged to add a binary code bit to block of a signal by selecting, within the block, (i) a reference frequency within the predetermined signal bandwidth, (ii) a first code frequency having a first predetermined offset from the reference frequency, and (iii) a second code frequency having a second predetermined offset from the reference frequency. The spectral amplitude of the signal at the first code frequency is increased so as to render the spectral amplitude at the first code frequency a maximum in its neighborhood of frequencies and is decreased at the second code frequency so as to render the spectral amplitude at the second code frequency a minimum in its neighborhood of frequencies. Alternatively, the portion of the signal at one of the first and second code frequencies whose spectral amplitude is smaller may be designated as a modifiable signal component such that, in order to indicate the binary bit, the phase of the modifiable signal component is changed so that this phase differs within a predetermined amount from the phase of the reference signal component. As a still further alternative, the spectral amplitude of the first code frequency may be swapped with a spectral amplitude of a frequency having a maximum amplitude in the first neighborhood of frequencies and the spectral amplitude of the second code frequency may be swapped with a spectral amplitude of a frequency having a minimum amplitude in the second neighborhood of frequencies. A decoder may be arranged to decode the binary bit.
    • 编码器被布置为通过在该块内选择(i)预定信号带宽内的参考频率来添加二进制码比特到信号块,(ii)具有从参考频率的第一预定偏移的第一码频率 ,和(iii)具有与参考频率的第二预定偏移的第二代码频率。 在第一编码频率处的信号的频谱幅度增加,以便在频率附近使第一编码频率处的频谱振幅最大,并以第二编码频率减小,以便使频谱幅度在第二编码频率 代码频率在其频率附近最小。 或者,在频谱幅度较小的第一和第二代码频率之一处的信号部分可以被指定为可修改信号分量,使得为了指示二进制位,可修改信号分量的相位改变为 该相位与参考信号分量的相位在预定量之内不同。 作为另外的替代方案,第一编码频率的频谱幅度可以用在第一频率附近具有最大幅度的频率的频谱幅度进行交换,并且第二编码频率的频谱幅度可以用频谱幅度 在第二频率附近具有最小振幅的频率。 解码器可以被布置为对二进制位进行解码。