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Patent

Karaoke (recorded orchestral accompaniment) tape generating machine for singing while listening to lyrics by earphone

Yoshikawa Tadahiro
TLDR
In this paper, a single monaural sound-recording/reproducing substrate is integrated, and as for a sound-reproducing head, that of stereo is used.
Abstract: 
PURPOSE:To easily generate a tape for singing while listening a phrase of lyrics before a start of its melody by an earphone, by searching between the head and the head of the melody by a pause button, and sound-recording fast the phrase while switching a track. CONSTITUTION:A single monaural sound-recording/reproducing substrate is integrated, and as for a sound-recording/reproducing head, that of stereo is used. In case of listening to a rhythm melody (hereinafter called a melody) sound-recorded previously, the input of the substrate is switched and connected to a melody side track reproducing side. (a reproducing button ON) In case of sound-recording a lyrics phrase, a microphone is connected to the input of the monaural substrate, and when the output of the substrate is provided together with a phrase side, namely, sound-recording side track bias current, the melody is inaudible only in case of sound-recording the phrase, but its tape can be made easily by a pause button without being influenced by the mutual interference of the head (stereo) inside. (a sound-recording button ON).

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