Patent ID: 8175443
Filing Date: 2012-05-08
Classification: H04N

Abstract:
1. A data recording and reproducing apparatus which records a compressed video or audio signal to a recording medium, the data recording and reproducing apparatus comprising: a transcoding module which transcodes an inputted video or audio signal based on one compression method to a signal based on another compression method; a recording and reproducing module which records, to the recording medium, the transcoded video or audio signal together with the inputted video or audio signal, the transcoded video or audio signal having been transcoded by the transcoding module; a tuner which receives a digital broadcast signal into which a video signal compressed by a first video compression method and an audio signal compressed by a first audio compression method are multiplexed; a multiplexing module which multiplexes a video signal and an audio signal to generate a video and audio stream signal; and a separating module which separates the video and audio stream signal into a video signal and an audio signal, wherein: the recording and reproducing module records one of the video or audio signals, which are identical but based on different compression methods with the other video or audio signal being written to the recording medium as a hidden file; the separating module separates the digital broadcast signal received by the tuner into a video signal and an audio signal; the transcoding module transcodes the video and audio signals acquired as a result of the separation to a video signal based on a second video compression method and an audio signal based on a second audio compression method respectively; the multiplexing module multiplexes either the audio signal based on the first audio compression method or the audio signal based on the second audio compression method with the video signal based on the second video compression method to generate a video and audio stream signal; and the recording and reproducing module writes, to the recording medium, the video and audio stream signal generated by the multiplexing module, and also writes the other audio signal, which has not been multiplexed by the multiplexing module, to the medium as a hidden file.