JPH0428120B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chord generation device suitable for use in an electronic musical instrument, which stores waveform data representing a mixed waveform of chord constituent tones in a memory, reads out the waveform data from the memory, and generates a chord. By forming signals, it is possible to obtain chords with good sound quality.

Conventionally known chord generators store waveform data corresponding to one musical instrument tone in a memory, and time-divisionally read out each note of the chord from this memory at a readout rate corresponding to the pitch. There is a system that reads out waveform data to form musical tone signals corresponding to each of the constituent tones of a chord, and generates a chord signal by adding (mixing) and D/A converting these musical tone signals.

However, with this type of conventional device,
The problem was that the resonance between the chord constituent notes was not good, resulting in chords that lacked a natural feel. Furthermore, since the waveform data processing circuit reads the waveform data in a time-division manner to form a plurality of musical tone signals, it is necessary to provide a plurality of time-division channels, which has the disadvantage of complicating the structure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a chord generating device with a simple structure that can generate high-quality chords.

The chord generating device according to the present invention stores waveform data corresponding to a chord played on a natural instrument such as a guitar, that is, waveform data representing a mixed waveform of chord constituent tones in a memory, and reads the waveform data from this memory. The present invention is characterized in that a chord signal is formed, and an embodiment shown in the accompanying drawings will be described in detail below.

The figure shows a chord generator according to an embodiment of the present invention.

The accompaniment keyboard circuit 10 includes an accompaniment keyboard consisting of, for example, the lower keyboard of an electronic instrument, and a key switch circuit including key switches corresponding to each key of the accompaniment keyboard. The key data KD is supplied to the chord name detection circuit 12.

The chord name detection circuit 12 extracts chord designation data by detecting chord names based on the key press data KD.
The chord name detection operation is performed in either single finger mode or finger chord mode based on the operation of chord mode selection switch 14, and in either case, chord name detection is performed in either single finger mode or finger chord mode. Data including chord type designation data TD and root note designation data RD is sent as data CD.

Single finger mode operation is performed when the switch 14 is set to the contact a position. In this case, if the chord type is major on the accompaniment keyboard, one key to specify the root note must be pressed. If the chord type is minor, seventh, etc. other than major, use 1 to specify the root note.
1 key and one or more keys for specifying the chord type. Note that the chord type can be specified according to the type of pressed key (white key or black key) or according to the number of pressed keys.

The finger chord mode operates when the switch 14 is set to contact b, and in this case, the root note and chord type are specified according to the way the chord is actually pressed on the accompaniment keyboard. be done.

The chord waveform memory 16 has memory sections for each chord type, such as major chord, minor chord, augmented chord, etc., and each memory section contains a mixed waveform of chord constituent tones obtained by playing a natural musical instrument. Waveform data indicating . For example, the major chord storage section stores waveform data corresponding to a mixture of C, E, and G, and the minor chord storage section stores waveform data corresponding to a mixture of C, E♭, and G. be done. Furthermore, the waveform data corresponding to each chord is such that the amplitude at each of a large number of sample points determined for the mixed waveform of the constituent tones of the chord is expressed in digital words.
Note that the major chord storage section, the minor chord storage section, the augmented chord storage section, etc. are all addressed by the chord type designation data TD.

The read rate control circuit 18 uses root note designation data.
A reading clock pulse signal CP is generated in response to RD, and the frequency of the clock pulse signal CP is determined in accordance with the pitch of the root note indicated by the root note designation data RD. For example, the frequency of the clock pulse signal CP in the case of the root note C# is 2 ^1/2 higher than that in the case of the root note C.
determined to be twice as high.

The address counter 20 starts counting the clock pulse signal CP in response to the chord timing signal CT from the rhythm pattern data generator 22. Supplied.

As an example, if the chord type specification data TD specifies the major note and the root note specification data RD specifies the root note C, then the chord constituent notes of the C major chord (C , E, G) is read out. In a similar manner, it is also possible to read waveform data corresponding to other chords. Then, the waveform data WD read out from the sum waveform memory 16
1 is supplied to multiplier 24. Note that when waveform data for one chord is read out from the harmonic waveform memory 16, the end detection circuit 25 generates an end detection signal ED to stop the reading operation by the counter 20.

Envelope generator 26 generates a chord timing signal.
It generates envelope data EV indicating a predetermined amplitude envelope according to the CT, and the envelope EV is supplied to the multiplier 26 to generate waveform data.
Multiplied by WD1. As a result of this multiplication, waveform data WD1 becomes WD when converted to analog.
1', the waveform data WD2 consisting of the multiplication output of the multiplier 26 becomes WD when it is analog converted.
It has an amplitude envelope as shown in 2'.

That is, the multiplier 24 and the envelope generator 26 are provided to eliminate differences in amplitude envelopes (the higher the pitch, the longer the sustain time) that occurs due to the difference in readout rate depending on changes in the root note. By providing this, almost the same amplitude envelope can be obtained for any chord. Note that if the sound range is narrow and the difference in amplitude envelope as described above is not a problem, the multiplier 24 and the envelope generator 26 may not be provided.

The waveform data WD2 from the multiplier 24 is digital-to-analog converted by the D/A converter 28, and the D/A converter 28 outputs an analog chord signal.
CS is sent. The chord signal CS is then supplied to the speaker 32 via the output amplifier 30, and is sounded as a chord.

The rhythm pattern data generator 22 generates the above-mentioned chord timing signal CT and rhythm pattern data RP for the rhythm type (for example, waltz) selected by a rhythm selection device (not shown), and the rhythm pattern data RP is for rhythm The signal is supplied to the sound source circuit 34.

The rhythm sound source circuit 34 contains rhythm pattern data.
The rhythm sound signal RS is generated by driving various percussion instrument sound sources according to the RP, and the rhythm sound signal RS is sent to the speaker 3 via the output amplifier 30.
2 and converted into sound. Therefore, the speaker 32 produces a rhythm sound corresponding to the selected rhythm and a chord suitable for the rhythm.

As described above, according to the present invention, waveform data indicating a mixed waveform of chord constituent tones is also stored, and a chord signal is formed based on this waveform data, so that a plurality of chord constituent tone signals can be mixed. Compared to the conventional case in which a chord signal is formed by using this method, the resonance between chord constituent notes is improved, making it possible to play chords with a natural feel. Furthermore, since the waveform data processing circuit does not necessarily require time-division processing, it has the effect of simplifying its configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a chord generator according to an embodiment of the present invention. 10... Accompaniment keyboard circuit, 12... Chord name detection circuit, 16... Harmonic waveform memory, 18... Read rate control circuit, 20... Address counter, 22...
...Rhythm pattern data generator, 28...D/A
converter.

Claims (1)

[Claims] 1. A means for generating chord specification data specifying a chord to be generated; a storage device for storing chord waveform data representing a mixed waveform of chord constituent notes for a plurality of chords;
A chord generating device comprising: reading means for reading chord waveform data from the storage device based on the chord designation data; and means for generating a chord signal according to the chord waveform data read from the storage device.