Patent ID: 8067684
Filing Date: 2011-11-29
Classification: G10H

Abstract:
1. An electronic musical instrument comprising: sound instructing means for instructing a frequency and a strength of a musical sound to be sounded by external operation; musical sound generating means for generating a musical sound signal based on the frequency instructed by the sound instructing means; controlling means for calculating a first parameter based on the frequency of the musical sound to be sounded and a second parameter based on the strength of the musical sound to be sounded; a parameter table having a first memory storing a plurality of sets of filter coefficients that are associated with each of a plurality of frequencies and a plurality of levels representing a degree of attenuation or enhancement of a gain of a filter in filter characteristics; filter coefficient generating means for extracting a set of filter coefficients determined based on the first parameter and the second parameter generated by the controlling means; and filter means for providing filtering processing based on the filter characteristics determined by the set of filter coefficients extracted by the filter coefficient generating means for the musical sound signal generated by the musical sound generating means, and for outputting a filtered result; wherein the parameter table stores a set of filter coefficients based on each set which includes each first parameter and a plurality of second parameters with a maximum level different from each other for each of a plurality of first parameters in order to obtain the filter characteristics in which the attenuation or the enhancement is realized with an almost constant slope from a reference frequency which is determined by the frequency of the supplied musical sound signal, which rises or falls as the frequency rises and falls, and from which the attenuation or the enhancement of the filter is started, and in which the slope is increased as the strength of the supplied musical sound signal is increased, where the second parameter is a maximum level of the attenuation or the enhancement of the gain in relation to the reference frequency in a previously determined given frequency, and the first parameter is a turnover frequency as a frequency in which a level of the gain becomes a given ratio in relation to the maximum level.