Score evaluation display device for an electronic song accompaniment apparatus

Claim 2

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.

Claim 3

The score evaluation display means as claimed in claim 3 wherein said sampling processor means comprises a first subtracter for obtaining the difference between said user-input song signal and said reference song signal and outputting a difference signal, and a sampling portion for sampling the difference signal output from said first subtracter.

Claim 4

The score evaluation display device as claimed in claim 1, wherein said first converter comprises a look-up table.

Claim 5

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 rhythm difference detector means comprises one-sample-delay means for delaying the sampling signal for a period which is the inverse of said sampling frequency to obtain the delayed sampling signal, a second subtracter for obtaining the difference between the sampling signal and the delayed sampling signal and outputting a rhythm difference signal having values which vary over time, a second means for summing the values of the rhythm difference signal output from said second subtracter and outputting a rhythm sum, a second switch device for transmitting the rhythm sum when one end signal, which indicates the end of said predetermined period of time, is received from an end clock generator and a second converter for converting the rhythm sum to obtain said second evaluation value.

Claim 6

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 rhythm difference detector means comprises one-sample-delay means for delaying the sampling signal for a period which is the inverse of said sampling frequency to obtain the delayed sampling signal, a second subtracter for obtaining the difference between the sampling signal and the delayed sampling signal and outputting a rhythm difference signal having values which vary over time, a second means for summing the values of the rhythm difference signal output from said second subtracter and outputting a rhythm sum, a second switch device for transmitting the rhythm sum when one end signal, which indicates the end of said predetermined period of time, is received from an end clock generator and a second converter for converting the rhythm sum to obtain said second evaluation value.

Claim 7

The score evaluation display means as claimed in claim 4, wherein said sampling processor means comprises a first subtractor for obtaining the difference between said user-input song signal and said reference song signal and outputting a difference signal, and a sampling portion for sampling the difference signal output from said first subtractor.

Claim 8

The score evaluation display device as claimed in claim 4, wherein said second converter comprises a look-up table.