Tone generator

In a tone generator including a counting circuit for successively changing the content thereof in accordance with a clock pulse and a comparison circuit for comparing the content of the counting circuit with a set value for a depressed key to detect coincidence between the content and the set value, the coincidence detection output of said comparison circuit being utilized as a reset signal for resetting said counting circuit and an output pulse of a desired interval being produced at a timing of resetting of said counting circuit, the improvement which comprises:

• first means for delaying the coincidence detection output of said comparison cirduit sequentially and successively in a plurality of stages to produce a plurality of delayed outputs differing in delay time;
• second means for selecting, as signals for resetting said counting circuit, some of the delayed signals produced by said first means sequentially and cyclically at a rate associated with a vibrato frequency;
• and
• third means for designating the delayed signals to be selected by said second means in such a manner that a combination of the designated signals varies with the lapse of time after depression of the key;
• whereby a vibrato effect changing in depth of vibrato with the lapse to time is produced.