公开(公告)号：US5945932A

公开(公告)日：1999-08-31

申请号：US961297

申请日：1997-10-30

申请人： Gregory L. Smith ,  John H. D. Wiltshire ,  Marvin C. Nolan

发明人： Gregory L. Smith ,  John H. D. Wiltshire ,  Marvin C. Nolan

IPC分类号： G10L19/00 ,  H04B1/66 ,  H03M7/00

CPC分类号： G10L19/018 ,  H04B1/665 ,  G11B20/00891

摘要： A code is embedded into an audio product so as to be processed therewith for recording and/or broadcast and yet be reliably detected while remaining inaudible to human perception. The code is represented by symbols formed from an impulse function having its energy within a specified frequency range. The audio product is analyzed to find segments which can mask the code based on tonality and a minimum signal energy. When the audio product with an embedded code is detected, decoding thereof involves finding candidate code signals which are checked against preset criteria. In particular, each symbol is made of at least two impulse functions with a preset spacing therebetween.

摘要翻译： 将代码嵌入到音频产品中，以便被处理以用于记录和/或广播，并且在可靠地被人感知的情况下被可靠地检测。 代码由其能量在指定频率范围内的脉冲函数形成的符号表示。 分析音频产品以找到可以基于音调和最小信号能量来掩蔽代码的段。 当检测到具有嵌入代码的音频产品时，其解码涉及发现根据预设标准检查的候选代码信号。 特别地，每个符号由至少两个具有预定间隔的脉冲功能构成。