Coding a masked data channel in a radio signal

Details Coding a masked data channel in a radio signal Coding a masked data channel in a radio signal

2006-07-18

2006-07-18

Bui, Bing Q. (Department: 2642)

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

C370S480000

Reexamination Certificate

active

07079633

ABSTRACT:
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.

REFERENCES:
patent: 6614914 (2003-09-01), Rhoads et al.
patent: 6763123 (2004-07-01), Reed et al.

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