Electronic musical instrument performing automatic accompaniment on programmable memorized pattern

DETAILED DESCRIPTION It is, therefore, a primary object of the present invention to provide an electronic musical instrument having an automatic accompaniment function allowing its player to program his or her own original accompaniment patterns in a simplified manner for the automatic performance thereof.
More particularly, in such a musical instrument as mentioned above, the information concerning an accompaniment key depression timing occurring on the keyboard of the instrument is automatically detected.
By storing, in a writable memory, the information of this detected key depression timings and also the information of the relative pitches of the depressed keys, the user is able to form a desired accompaniment pattern with a real time of the operation of the keys of the keyboard.
Another object of the present invention is to provide an electronic musical instrument having a rhythmic chord accompaniment function, which is arranged to automatically detect the depression timing or timings of keys intended to designate the chord tone producing timing or timings, and to store the detected timing or timings in a rewritable memory to thereby allow the user to form a desired rhythm chord pattern with a real time which is equal to the speed of the actual key depression or depressions.
More particularly, in an electronic musical instrument having a rhythmic chord accompaniment device for performing a chord accompaniment by automatically beating at a predetermined rhythm or timing, it should be noted that the programming of a rhythmic chord accompaniment pattern is entrusted with the player himself of the instrument so as to enable the player to form an accompaniment pattern suitable for the player's own performance with real time inputting.
According to the present invention, the electronic musical instrument having an automatic accompaniment function comprises: detecting means for detecting the timing of generation of a key information caused by the user's keyboard operation based on a predetermined reference performance tempo; rewritable memory means for storing the detected key information concerning relative note pitches of the depressed keys and also the information of the generating timing of such key information; and selecting means capable of selecting these informations read out from the memory means as the accompaniment pattern informations to be used at the time of an automatic performance