Audio/video data recording/reproducing device and method, and audio/video data reproducing device and method

An audio/video data reproducing device, comprising:

• a compressed data output part that outputs compressed data that has been recorded to an external device through a digital interface;
• a reproduction signal output part that outputs a synthesized signal after being subjected to compression, which is obtained by generating a reproduction signal from the compressed data that has been recorded and further adding thereto another signal, to the external device through the digital interface;
• and
• a switching part that switches between an output from the compressed data output part and an output from the reproduction signal output part.

An audio/video data recording/reproducing device, comprising:

• a transmitting part that transmits an MPEG-2 transport stream;
• a read-out part that reads out the MPEG-2 transport stream that has been recorded on a recording medium;
• a compressing part that compresses an audio/video signal to generate the MPEG-2 transport stream;
• an expanding and synthesizing part that expands the MPEG-2 transport stream to generate the audio/video signal and further synthesizes the audio/video signal with another audio/video signal;
• a digital interface part that allows the MPEG-2 transport stream to be output to an external device;
• and
• a recording part that records the MPEG-2 transport stream on the recording medium,
• wherein when reproducing the audio/video signal, switching is performed between output of the MPEG-2 transport stream through the read-out part, the transmitting part and the digital interface part and output of the MPEG-2 transport stream through the read-out part, the transmitting part, the expanding and synthesizing part, the compressing part, the transmitting part and the digital interface part, and
• when recording the audio/video signal, the MPEG-2 transport stream is recorded through the compressing part, the transmitting part and the recording part.

An audio/video data reproducing device, comprising:

• a transmitting part that transmits an MPEG-2 transport stream;
• a read-out part that reads out the MPEG-2 transport stream that has been recorded on a recording medium;
• a compressing part that compresses an audio/video signal to generate the MPEG-2 transport stream;
• an expanding and synthesizing part that expands the MPEG-2 transport stream to generate the audio/video signal and further synthesizes the audio/video signal with another audio/video signal;
• and
• a digital interface part that allows the MPEG-2 transport stream to be output to an external device,
• wherein switching is performed between output of the MPEG-2 transport stream through the read-out part, the transmitting part and the digital interface part and output of the MPEG-2 transport stream through the read-out part, the transmitting part, the expanding and synthesizing part, the compressing part, the transmitting part and the digital interface part.

A method of recording/reproducing audio/video data, comprising the steps of:

• outputting compressed data that has been recorded to an external device through a digital interface;
• outputting a reproduction signal, in which a synthesized signal after being subjected to compression, which is obtained by generating a reproduction signal from the compressed data that has been recorded and further adding thereto another signal, is output to the external device through the digital interface;
• recording an audio/video signal by compression;
• and
• switching between output in the step of outputting the compressed data and output in the step of outputting the reproduction signal.

A method of reproducing n audio/video data, comprising the steps of:

• outputting compressed data that has been recorded to an external device through a digital interface;
• outputting a reproduction signal, in which a synthesized signal after being subjected to compression, which is obtained by generating an audio/video signal from the compressed data that has been recorded and further adding thereto another audio/video signal, is output to the external device through the digital interface;
• and
• switching between output in the step of outputting the compressed data and output in the step of outputting the reproduction signal.

A method of recording/reproducing audio/video data, comprising the steps of:

• transmitting an MPEG-2 transport stream;
• reading out the MPEG-2 transport stream that has been recorded on a recording medium;
• compressing an audio/video signal to generate the MPEG-2 transport stream;
• expanding the MPEG-2 transport stream to generate the audio/video signal and further synthesizing the audio/video signal with another audio/video signal;
• outputting the MPEG-2 transport stream to an external device through a digital interface;
• and
• recording the MPEG-2 transport stream on the recording medium,
• wherein when reproducing the audio/video signal, switching is performed between output of the MPEG-2 transport stream through the steps of reading out, transmitting, and outputting and output of the MPEG-2 transport stream through the steps of reading out, transmitting, expanding and synthesizing, compressing, transmitting, and outputting, and
• when recording the video/audio signal, the MPEG-2 transport stream is recorded through the steps of compressing, transmitting, and recording.

A method of reproducing audio/video data, comprising the steps of:

• transmitting an MPEG-2 transport stream;
• reading out the MPEG-2 transport stream that has been recorded on a recording medium;
• compressing an audio/video signal to generate the MPEG-2 transport stream;
• expanding the MPEG-2 transport stream to generate the audio/video signal and further synthesizing the audio/video signal with another audio/video signal;
• and
• outputting the MPEG-2 transport stream to an external device through a digital interface,
• wherein switching is performed between output of the MPEG-2 transport stream through the steps of reading out, transmitting, and outputting and output of the MPEG-2 transport stream through the steps of reading out, transmitting, expanding and synthesizing, compressing, transmitting, and outputting.