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Apparatus for multiplexing an audio signal in a video-song playback system

  • US 5,668,339 A
  • Filed: 10/26/1995
  • Issued: 09/16/1997
  • Est. Priority Date: 10/26/1994
  • Status: Expired due to Fees
First Claim
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1. An apparatus for multiplexing an audio signal in a video-song playback system, which comprises:

  • a digital signal processing section for processing a first stereo accompaniment music read out from an L and an R channels included in digital audio channels of the video-song medium, into digital audio signals, to output a first and a second digital audio signals, the video-song medium having both the digital audio channels with the first stereo accompaniment music recorded therein and analog audio channels with a second stereo accompaniment music that includes a singer'"'"'s singing voice;

    an analog signal processing section for processing the second stereo accompaniment music read out from the L and the R channels, included in the analog audio channels of the video-song medium, into analog audio signals, to output the first and the second analog audio signals;

    a first switching section for switching over between the first digital audio signal from the digital signal processing section and the first analog audio signal from the analog signal processing section, to output a first switched signal;

    a second switching section for switching over between the second digital audio signal from the digital signal processing section and the second analog audio signal from the analog signal processing section, to output a second switched signal;

    an audio multiplexing section for adjusting audio levels of the first and second digital audio signals from the digital signal processing section, of the first switched signal from the first switching section and of the second switched signal from the second switching section in an analog mode and a video-song mode, to output a first and a second multiplexed signals;

    first and second amplifying sections for amplifying the first and the second multiplexed signals, to output a first and a second amplified signals;

    a first mode switching section for switching between the first switched signal from the first switching section and the first amplified signal from the first amplifying section in order to switch between a normal playback mode and a video-song mode, to output a first mode switched signal;

    a second mode switching section for switching between the second switched signal from the second switching section and the second amplified signal from the second amplifying section in order to switch between the normal playback mode and the video-song mode, to output a second mode switched signal;

    a third amplifying section for amplifying the first mode switched signal from the first mode switching section, to output a third amplified signal;

    a fourth amplifying section for amplifying the second mode switched signal from the second mode switching section, to output a fourth amplified signal; and

    a control section for sensing whether a selected mode is the normal playback mode or the video-song mode, to control the first and the second switching sections and the first and the second mode switching sections.

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