Patent ID: 7117515

Claim:
A method of transmitting/receiving a specific trailer using an electronic program guide (EPG) identifying a plurality of broadcast programs, the method comprising: multiplexing a video signal, an audio signal, and an EPG signal, each signal having an elementary packet identifier, the EPG signal including a trailer location descriptor; encoding and modulating the multiplexed signals and coding and modulating a plurality of trailer signals, each trailer signal having an elementary packet identifier, to transmit the multiplexed signals and trailer signals through respective channels; receiving the respectively transmitted signals by decoding and demodulating the received signals according to the corresponding elementary packet identifier and the trailer location descriptor, to extract each of the multiplexed signals and to store in memory the extracted EPG signal and the demodulated trailer signals; displaying the stored EPG signal; and selecting for additional display one of the plurality of trailer signals by selecting one of the plurality of broadcast programs of the displayed EPG signal so as to retrieve from memory the selected trailer signal based on the trailer location descriptor; wherein the selected trailer signal is processed via a trailer information processor part, to be added to the displayed EPG signal; wherein the trailer location descriptor in the following order a descriptor tag field of 8 bits, a descriptor length field of 8 bits, a reserved field of 3 bits, a PCR PID field of 13 bits, a reserved field of 4 bits, a major channel number tag field of 10 bits, a minor channel number field of 10 bits, a reserve field of 3 bits and an elementary PID field of 13 bits, the fields of the trailer location descriptor being in said order.