Method and apparatus for determining transmission mode and synchronization for a digital audio broadcasting signal

An apparatus for transmitting control information in a digital audio broadcasting system, said apparatus comprising:

• means for generating a plurality of control bits in each of a plurality of control frames, a first sequence of said control bits representing a transmission mode and a second sequence of said control bits representing a control data synchronization word;
• means for interleaving a plurality of frames of digital information to form a plurality of interleaver frames, wherein each of the frames of digital information includes a single control bit of the plurality of control bits;
• and
• means for transmitting the plurality of interleaver frames, each of said interleaver frames including a plurality of said control frames.

An apparatus for transmitting control information in a digital audio broadcasting system, said apparatus comprising:

• a waveform generator for generating a plurality of control bits in each of a plurality of control frames, a first sequence of said control bits representing a transmission mode, and a second sequence of said control bits representing a control data synchronization word;
• means for interleaving a plurality of frames of digital information to form a plurality of interleaver frames, wherein each of the frames of digital information includes a single control bit of the plurality of control bits;
• and
• means for transmitting the plurality of interleaver frames, each of said interleaver frames including a plurality of said control frames.

A system for transmitting and receiving digital audio broadcasting control information, said system comprising:

• a transmitter including a waveform generator for generating a plurality of control bits in each of a plurality of control frames, a first sequence of said control bits representing a transmission mode, and a second sequence of said control bits representing a control data synchronization word;
• means for interleaving a plurality of frames of digital information to form a plurality of interleaver frames, wherein each of the frames of digital information includes a single control bit of the plurality of control bits;
• and means for transmitting a plurality of interleaver frames, each of said interleaver frames including a plurality of said control frames;
• and
• a receiver including a demodulator for demodulating a digital audio broadcasting signal to retrieve the plurality of control bits;
• and a processor for processing said plurality of control bits to identify said control bits representing said control data synchronization word.

A method for transmitting and receiving digital audio broadcasting control information, said method comprising the steps of:

• generating a plurality of control bits in each of a plurality of control frame a first sequence of said control bits representing a transmission mode, and a second sequence of said control bits representing a control data synchronization word;
• interleaving a plurality of frames of digital information to form a plurality of interleaver frames, wherein each of the frames of digital information includes a single control bit of the plurality of control bits;
• and
• transmitting a plurality of interleaver frames, each of said interleaver frames including a plurality of said control frames;
• demodulating a digital audio broadcasting signal to retrieve said plurality of control bits;
• and
• processing said plurality of control bits to identify said control bits representing said control data synchronization word.

A method for determining transmission mode and synchronization for a digital audio broadcasting signal, said method comprising the steps of:

• receiving a plurality of interleaver frames containing digital information, each of said interleaver frames including a plurality of control frames, said control frames including a plurality of control bits, a first sequence of said control bits representing a transmission mode and a second sequence of said control bits representing a control data synchronization word;
• processing said plurality of control bits to identify said control bits representing said control data synchronization word;
• summing the control bits in said first sequence for one of said interleaver frames to produce a summed value;
• comparing said summed value to one of a plurality of predetermined values representative of a plurality of transmission modes;
• and
• selecting a transmission mode corresponding to the predetermined value that is closest to the summed value.

An apparatus for determining transmission mode and synchronization for a digital audio broadcasting signal, said apparatus comprises:

• means for receiving a plurality of interleaver frames containing digital information, each of said interleaver frames including a plurality of control frames, said control frames including a plurality of control bits, a first sequence of said control bits representing a transmission mode and a second sequence of said control bits representing a control data synchronization word;
• means for processing said plurality of control bits to identify said control bits representing said control data synchronization word;
• wherein said plurality of control bits further includes a third sequence of control bits representative of an interleaver synchronization word;
• means for summing the control bits in said first sequence for one of said interleaver frames to produce a summed value;
• means for comparing said summed value to one of a plurality of predetermined values representative of a plurality of transmission modes;
• and
• means for selecting a transmission mode corresponding to the predetermined value that is closest to the summed value.