Method and apparatus for am compatible digital broadcasting

Simultaneous) and simulation digital signal method of standard AM signal channel, emitting with the first spectrum comprises a used by signal modulation amplitude modulation radiofrequency signal of the first substrate,Simultaneous a group of digital intelligent, signals the signal arranged comprises a first spectrum the frequency band. The digital control carrier modulated is a digital signal a part of two. The first group of digital control intelligent signals of the first spectrum range, and a first intelligent signal orthogonal. Second and third group of digital control intelligent signals of the first outer spectrum, and a first intelligent synchronization signal and orthogonal.