Remote controller, and system and method for remotely controlling digital television

A remote controller comprising:

• a data input unit for receiving video or audio data inputted from an external storage medium;
• a data modulator for modulating the video or audio data received by the data input unit into a transmittable wireless signal;
• a frequency converter for down-converting a local oscillation frequency of the wireless signal modulated by the data modulator;
• a noise filter for filtering noise of the wireless signal frequency-down-converted by the frequency converter;
• and
• a wireless signal transmitter for transmitting the wireless signal noise-filtered by the noise filter.

A TV receiver comprising:

• a wireless signal receiver for receiving a wireless signal transmitted from a remote controller, the remote controller receiving video or audio data inputted from an external storage medium;
• a data demodulator for demodulating the wireless signal received by the wireless signal receiver into the video or audio data;
• an error detector for detecting an error of the data demodulated by the data demodulator;
• a video decoder for decoding video data from the error detector;
• an audio decoder for decoding audio data from the error detector;
• a video processor for processing the decoded video data for reproduction thereof;
• an audio processor for processing the decoded audio data for reproduction thereof;
• a display module for displaying an image from the video processor on the screen;
• and
• a speaker for outputting a sound from the audio processor.