Koichi Kozuki

Electronic musical instrument equipped with memorized randomly modifiable accompaniment patterns

An electronic musical instrument comprises an accompaniment keyboard; a memory of a relatively small capacity storing a set of accompaniment data sequentially aligned and constituting accompaniment patterns; a read-out circuit to successively read out the accompaniment data from the memory at given clock pulse timings; a judging circuit to judge whether each accompaniment datum read out indicates a predetermined specific value; a random signal generator for generating, independently of the data-reading-out timings, random signals each differing in value with time; an accompaniment data determining circuit to determine the contents of each read-out accompaniment datum when the latter is judged to indicate the specific value in accordance with the signal randomly outputted just when a judgement is made; and a tone generation determining circuit to determine the generation of the accompaniment tone based on the key depression information coming from the accompaniment keyboard and also to function, when the read-out accompaniment datum does not indicate the specific value, to generate regular accompaniment pattern. The instrument performs automatic accompaniments on the read-out accompaniment patterns with random modification of a part of the pattern. Thus the automatic bass and chord accompaniment is realized in non-monotonous, variation-rich manner without a players temporal manipulation.

Reverberation - imparting device capable of modulating an input signal by random numbers

A reverberation-imparting device includes a delay line for storing a signal to which a reverberation effect is to be imparted. The delay line has at least one reading location determining timing for reading out the signal stored therein. An address generator generates basic reading address values for determining the at least one reading location. The basic reading address values are modulated by at least two different random numbers generated by a random number generator to determine reading address values. At least two signals read from the delay line are cross-faded, based on the modulated reading address values, such that the at least two signals are alternately intensified and attenuated with a predetermined phase difference. In a preferred application of the invention, the cross-faded at least two signals are output and delivered to a suitable reverberation-imparting device.

Apparatus for printing out graphical patterns

A musical score printing apparatus comprises: storing means for storing a musical score data; read-out controlling means for successively reading out the musical score data from the storing means; converting means for converting the musical score data read out from the storing means to a musical score print and paper feed data; and printing means for printing out the musical score on a printing sheet based on the musical score print and paper feed data delivered from the converting means, wherein arrangement is so provided that where printing of a musical score is suspended at halfway of a measure block and thereafter a reprint command is given, the printing of the musical score is resumed from the beginning of the measure block in which the suspension of the printing has been taking place.

Electronic musical instrument having automatic ornamental effect

An electronic musical instrument generates musical tones corresponding to a melody tone and a chord tone which are designated by a performer. In order to apply a specific musical effect or generate an ornament, a front percussive tone, or forefall, is automatically added to the melody tone, wherein this front percussive tone has the predetermined pitch difference with respect to the melody tone. This front percussive tone is additionally generated prior to the melody tone in the predetermined short period. Instead of this front percussive tone, it is possible to generate an additional tone which has the same tone name as any one of constituent tones within the chord tone but its tone pitch is different from that of the melody tone. When generating plural melody tones and plural additional tones, these tones are sequentially generated by a predetermined time difference in a pitch descending or ascending order.