Patent ID: 7400820

Claim:
A signal processing apparatus comprising: an encoder for converting a video signal of a first format into a second video signal of a second format so that a relative position of first auxiliary data in said first format is lost; a location data generator for generating a location data indicating said relative position of said first auxiliary data in said first format; a packet generator for generating a second auxiliary data packet including a second header and second auxiliary data, the second header carrying the location data and a valid/invalid flag, the valid/invalid flag indicating that the location data is valid or invalid such that when the location data is valid the first auxiliary data is to be multiplexed at a first location in the video signal of the first format based on the location data carried by the second header and when the location data is invalid the first auxiliary data is to be multiplexed at a second location in the video signal of the first format determined regardless of the location data carried by the second header; and a multiplexing section for multiplexing the second auxiliary data packet in the video signal of the second format.