| 摘要 |
Disclosed are a method and several embodiments for issuing and receiving a product notice message by incorporating a product notice message into at least one of a control data stream and a program data stream carried in digital broadcast data stream. This is accomplished by combining at least one of a control data stream and a program data stream into a time-multiplexed data stream, splintering the multiplexed data stream into a plurality of sub-streams, generating a corresponding plurality of modulated carriers according to each of the sub-streams, combining the plurality of modulated carriers into a composite radio frequency signal and then radiating the composite radio frequency signal. In order to receive the signal, the composite radio frequency signal that includes a plurality of modulated carriers is received and each carrier therein is demodulated into a plurality of corresponding data sub-stream. These are then combined into a time-multiplexed, multi-channel data stream. A channel is these selected from at least one of the control channel and the program channel which are typically included in the time-multiplexed, multi-channel data stream. A product notice is extracted from the selected channel and presented to a user.
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