| 摘要 |
A system for supplementing an audio signal with auxiliary data in an inaudible channel. The system can include an audible radio signal source having at least a left channel and a right channel. A digital signal processor can be programmed to transform the audible radio signal source into a frequency domain representation having multiple frequency component portions of the audible radio signal. A comparator can be coupled to the digital signal processor and can have an established imperceptible IPD. The comparator can identify selected ones of the frequency component portions having corresponding phase values which do not exceed the imperceptible IPD. Finally, an encoder can be configured to encode a digital auxiliary data signal into the audible radio signal by modifying the corresponding phase values to correspond to individual bit values of the digital auxiliary data. |
