Apparatus and process for the inclusion of a code with at least one component of a frequency of code in an audio signal with a plurality of components of frequency of audio signal device and PRocesso for coding of an audio signal device and process for detection of a code into an audio signal encoded and digital computer programmed to detect a code in a sign of theAudio encoded

摘要

Apparatus and methods for including a code (68) having at least one code frequency component in an audio signal (60) are provided. The abilities of various frequency components in the audio signal to mask the code frequency component to human hearing are evaluated (64), and based on these evaluations an amplitude (76) is assigned to the code frequency component. Methods and apparatus for detecting a code in an encoded audio signal are also provided. A code frequency component in the encoded audio signal is detected based on an expected code amplitude or on a noise amplitude within a range of audio frequencies including the frequency of the code component.