Digital broadcasting apparatus and method, video data encoding system and method, and broadcasting signal decoding system and method, which use variable bit rate

A broadcasting signal encoding apparatus that receives and encodes broadcasting data, comprising:

• a broadcasting data analyzing portion that analyzes a complexity of the broadcasting data, and determines an amount of user data to be inserted into a user data region of the broadcasting data;
• a user data inserting portion that receives additional information data and inserts the additional information data into the user data in accordance with the determined amount of the user data to be inserted into the user data region as user data;
• and
• a transmitting portion that transmits the encoded broadcasting data and the inserted user data including the additional information data.

A broadcasting signal decoding apparatus that receives broadcasting data containing encoded video data, encoded audio data, and encoded data of additional information, the broadcasting signal decoding apparatus comprising:

• a user data outputting portion that outputs user data from one of the video and audio data of the received broadcasting data;
• an additional information data decoding portion that receives and decodes the data of the additional information from the broadcasting data;
• and
• a user data decoding portion that receives and decodes the output user data.

A digital broadcasting signal transmitting method for receiving and transmitting an encoded a digital broadcasting signal containing a video signal, an audio signal and data of additional information, the method comprising:

• determining a video bit rate allocated to the video signal and an additional information bit rate allocated to the additional information in accordance with the video signal, and outputting the determined video and additional information bit rates;
• encoding the video signal in accordance with the video bit rate allocated to the video signal;
• and
• receiving the data of the additional information to the extent the additional information bit rate allocated to the additional information allows, and converting the received data of the additional information into a predetermined data broadcasting format.

A method of receiving and encoding broadcasting data using a digital broadcasting signal transmitting apparatus, the encoding method comprising:

• analyzing a complexity of the received broadcasting data, and determining an amount of user data that is insertable;
• receiving data of additional information for service and inserting the data of the additional information as user data in the received broadcasting data in accordance with the determined amount of the user data that is insertable;
• and
• transmitting the encoded broadcasting data having the inserted user data.

A decoding method for receiving and decoding broadcasting data containing encoded video data, encoded audio data, and encoded data of additional information, the decoding method comprising:

• outputting user data from the broadcasting data;
• receiving and decoding the data of the additional information;
• and
• receiving and decoding the output user data.

A data encoder to encode first and second data, where the first data is encoded at a first bit rate below a threshold bit rate, the encoder comprising:

• a data analyzer to analyze the received first data and to determine the first bit rate and a second bit rate;
• a first data encoder to encode the first data at the first bit rate;
• a second data formatter to format the second data in accordance with the second bit rate;
• and
• a combiner unit to combine the encoded first data and the formatted second data to form a combined data to be output at the threshold bit rate.

A data decoder for decoding encoded first and second data, the data decoder comprising:

• a separator to receive the encoded first and second data as an encoded combined data having a constant bit rate, and to remove and separately output the encoded first and second data;
• a first data decoder to detect the first bit rate and to decode the encoded first data encoded at the first bit rate;
• and
• a second data decoder to detect the second bit rate and to decode the encoded second data encoded at the second bit rate,
• wherein the constant bit rate comprises the combined first and second bit rates.

A data decoder for decoding encoded first and second data transmitted as encoded combined data at a constant bit rate, the data decoder comprising:

• a separator to receive the encoded combined data at the constant bit rate, to separate the first and second data, which have corresponding variable first and second bit rates, from the encoded combined data having the constant bit rate, and to separately output the encoded first and second data having the variable first and second bit rates;
• a first data decoder to decode the encoded first data encoded at the first bit rate;
• and
• a second data decoder to decode the encoded second data encoded at the second bit rate.