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Score evaluation display device for an electronic song accompaniment apparatus

  • US 5,434,949 A
  • Filed: 08/13/1993
  • Issued: 07/18/1995
  • Est. Priority Date: 08/13/1992
  • Status: Expired due to Term
First Claim
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1. A score evaluation display device for an electronic song accompaniment apparatus which displays an evaluation score by detecting the difference between an input song signal transmitted via a user-audio input device, and a reference song signal, said display device comprising:

  • sampling processor means for detecting the difference between said input song signal and said reference song signal to produce a difference signal, for sampling the difference signal at a predetermined sampling frequency and for producing a sampling signal which has various values over time;

    volume difference detector means for accumulating the values of said sampling signal therein for a predetermined period of time to generate an accumulated value so as to detect a volume difference based on the accumulated value and for determining a first evaluation value based on said volume difference;

    rhythm difference detector means for delaying said sampling signal to produce a delayed sampling signal and for accumulating therein a difference between said sampling signal and said delayed sampling signal, and for detecting a rhythm difference based on said sampling signal and said delayed sampling signal and for determining a second evaluation value based on said rhythm difference; and

    first adder means for summing said first and second evaluation values to thereby produce a finally evaluated score, wherein said volume difference detector means comprises a first means for summing the values of the sampling signal and outputting a sum, a first switch device for transmitting the sum when an end signal, which indicates the end of the predetermined period of time, is output from an end clock generator and a first converter for converting the sum to obtain said first evaluation value.

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