An electronic musical instrument capable of producing, by frequency modulation, a musical tone containing harmonic components of integer and non-integer orders at complicated ratios which change with time. In frequency modulation, amplitudes of carrier and side frequencies are preceded by a positive or negative sign depending upon a value of modulation index. By suitably setting the value of modulation index, phase inversion occurs in the side frequencies so that cancellation or augmentation of ...

A key assigner for use in an electronic musical instrument is capable of detecting changes in key switches by comparing present ON-OFF states of the key switches with previous ON-OFF states thereof. Only one of detection signals is delivered out by a priority circuit in a predetermined order of priority and a key code corresponding to this delivered out signal is produced. This key code is compared with key codes of respective channels previously stored in a key code memory having channels equal...

An electronic musical instrument called a music synthesizer has channels equal in number to a maximum number of tones to be reproduced simultaneously and can produce a plurality of musical tones simultaneously. Note voltages are sampled by actuating corresponding key gate circuits and the sampled note voltages are allotted to corresponding channels in time-shared sequence. Musical tones are reproduced from the note voltages allotted to the respective channels. A key gate control signal for actua...

In an electronic musical instrument, key switches are scanned sequentially and repetitively in a high scanning rate to deliver key data consisting of a pulse existence at an assigned time slot and representing ON-OFF states of the key switches. The key data is converted into key codes of digital notation. The key codes are assigned to and memorized in time-shared channels of a high time-sharing rate. A time-sharing rate converter reads out the key codes of digital notation and produces key gate ...

In this electronic musical instrument a musical tone is generated by repetitively reading out a waveshape stored in a memory. Repetitive sets of phase information are produced, such phase information thus being a linear saw-tooth-like digital signal having a repetition period corresponding to the frequency of the generated musical tone. Phase distorting means modifies the shape of the phase information so as to distort said linear saw-tooth-like signal, without changing the repetition period the...

A root note detection circuit detects the highest or lowest key among depressed keys in an accompaniment key range as a root note designation key. A root note memory stores the detected root note data and rewrites its storage each time the detected root note data changes. A chord type detection circuit detects a chord type in accordance with states of depression of keys other than the detected root note designation key in the accompaniment key range. The detected chord type data is stored in a c...

In this electronic musical instrument a musical tone is generated by repetitively reading out a waveshape stored in a memory. Repetitive sets of phase information are produced, such phase information thus being a linear saw-tooth-like digital signal having a repetition period corresponding to the frequency of the generated musical tone. Phase distorting means modifies the shape of the phase information so as to distort said linear saw-tooth-like signal, without changing the repetition period the...

In this electronic musical instrument a musical tone is generated by frequency modulation employing a carrier wave and a modulating wave. Plural tone production channels are employed and a key assigner assigns production of a tone corresponding to a depressed key to an available channel. Tone production is achieved by a frequency modulation operation carried on in a time-shared manner for each channel. In order to achieve complex variation in harmonic content of the tone signal which is generate...

A display device for an automatic rhythm performance apparatus comprises a common display unit which selectively displays tempo and rhythm advancement of the automatic rhythm performance. For this purpose, the device has a selector for selecting the display contents so that the display of tempo is performed by numerical value before the rhythm starts, and the display of the rhythm advancement is performed by the number of measures, the number of beats and a demarcating mark between them after th...

An automatic performance device comprises a pattern memory for storing a plurality of performance patterns and a sequence memory for storing a pattern progression. The pattern progression is programable and is written in the sequence memory. The performance patterns are selected one by one from the pattern memory according to the pattern progression. Each selected performance pattern is read out according to a tempo pulse. An automatic performance is carried out on the basis of the read-out perf...