Loading patent…
AssigneeiBiquity Digital Corporation
InventorsBrian William Kroeger, E. Glynn Walden, George Nicholas Eberl
Estimating the term…
A method for AM in-band-on-channel (IBOC) digital audio broadcasting (DAB) uses a center channel signal in a central frequency band of an AM radio channel, the center channel signal is modulated by first and second versions of the program material to be transmitted. Sub-carriers in a upper and lower sidebands of the AM radio channel are modulated with addition digitally encoded portions of the program material. The upper sideband lies within a frequency band extending from about +5 k Hz to about +10 kHz from a center frequency of the radio channel and the lower sideband lying within a frequency band extending from about −5 k Hz to about −10 kHz from the center frequency of the radio channel. The center channel signal the upper and lower sideband sub-carriers are transmitted to receivers. In a hybrid IBOC DAB version, the center channel signal includes a carrier which is analog modulated by the first version of the program material and additional sub-carriers modulated by the second version of the program material, wherein the additional sub-carriers are transmitted at a power spectral density level that is less than the power spectral density of the analog modulated carrier. In an all-digital version, the center channel signal includes two groups of sub-carriers modulated with the program material.
A method of receiving broadcast program material, the method comprising the steps of:
A receiver for receiving broadcast program material, the receiver comprising:
A receiver for receiving broadcast program material, the receiver comprising:
Dependencies are inferred from the claim text.