Method and apparatus for playing multimedia audio-visual presentations
View Patent ↗An apparatus and method is provided to generate digital audio signals, such as stereo signals, from a multimedia program. The program can be distributed directly through an electronic network, or indirectly by recording the program on a medium such as a DVD or CD. The multimedia program is normally compressed using a standard DVD, MPEG or similar compression protocol. In accordance with the invention, the program is decoded to generate a multimedia output signal and an audio output signal. The multimedia signals can be played immediately or at will on a suitable multimedia device. The audio output signal is compressed, using for instance MP3 or ATRAC3, and then transmitted to an external device for storage as a digital file. The digital file can then be replayed at will.
1. An apparatus for processing a multimedia program composed of a compressed signal, the multimedia program including a compressed audio program component and a compressed video program component, said audio program component including an audio track for the video program component, said audio program component and video program component being configured to be played synchronously and simultaneously by a multimedia player as said multimedia program, said apparatus comprising:
an input port receiving a single input signal consisting of said compressed signal;
a signal processor coupled to said input port and being configured to perform all the signal processing of said compressed signal, said signal processor being adapted to selectively extract said audio program component from said compressed signal without extracting and uncompressing said video program component from said compressed signal, wherein said audio program component includes a multichannel audio signal;
an audio output stage including a folder circuit adapted to fold said multichannel audio signal into a stereo channel audio signal; and
an output port for outputting said stereo channel audio signal.
2. The apparatus of claim 1 wherein said input port is adapted to receive a broadband multimedia program.
3. The apparatus of claim 1 wherein said input port includes a media reader.
4. The apparatus of claim 3 wherein said input port includes a DVD reader.
5. The apparatus of claim 1 wherein said signal processor is further adapted to generate output signals including said multichannel audio signal.
6. The apparatus of claim 1 wherein said audio output stage further includes a compressor configured to compress said stereo channel audio signal into a compressed digital output signal.
7. The apparatus of claim 6 wherein said compressor is configured to compress said stereo channel audio signal using an MPEG standard.
8. The apparatus of claim 6 wherein said compressor is configured to compress said stereo channel using an ATRAC standard.
9. A method of processing a compressed multimedia program in a processing apparatus for play on an incompatible digital audio device comprising the steps of:
receiving said compressed multimedia program on a single input port, said multimedia program including an audio component and a video component, said audio component including an audio track for the video component, said audio and video components being configured to be played synchronously and simultaneously on a multimedia player, said audio and video components being compressed to form said compressed multimedia program using a standard compression protocol;
selectively extracting said audio component from said multimedia program without uncompressing said video component using a signal processor configured to decompress said multimedia program in said processing apparatus to obtain only said audio component and without said video component;
processing said audio component to generate a processed audio signal in a format compatible with the digital audio device so that said processed audio signal is playable on the digital audio device, wherein said processed audio signal is a multichannel audio signal; and
folding said multichannel audio signal into a stereo audio signal; and
outputting said stereo audio signal to the digital audio device.
10. The method of claim 9 wherein said multimedia program is received electronically from a distribution network, further comprising storing said multimedia program.